CN1771380B - Expansion grouting bolt and grouting method using same - Google Patents

Abstract

The present invention provides an expandable grouting bolt (1A) which is formed in a tubular shape capable of applying an internal pressure from the rear end portion and has an expansion portion (3) radially expanded by the application of the internal pressure and a grouting port forming portion (9A) for opening a grouting port (7) by the application of the internal pressure, wherein the expansion portion (3) is expanded by the internal pressure to be closely attached to a foundation, the grouting port forming portion (9A) is opened at the grouting port forming portion (7), and a hardening grouting material is grouted into the foundation through the grouting port (7), thereby reinforcing the foundation.

Description

Expansion grouting bolt and grouting method using the same

technical field

The present invention relates to an expansion grouting bolt used both as a rock anchor bolt and a pouring pipe in, for example, natural foundation reinforcement works of tunnel engineering, and a grouting method using the same.

Background technique

In the known technology, a drilling machine is used to drill a hole on the slope of the natural foundation, the pouring pipe is inserted into the drilled hole, and after hardening grouting materials such as cement slurry are poured, the steel bolt type rock anchor bolt is inserted into the drilled hole. , the rock anchor bolts are fixed by the hardening of the hardening grouting material, and the bolt portion of the rock anchor bolt protruding from the drill hole to the outside is passed through the support plate, and the nut is tightened to reinforce (for example, refer to Japanese patent Publication No. 2000-303480).

As a rock anchor bolt that can be fixed without using a hardening grouting material, there is known a tubular bolt that is closed at the front end, has a supply port at the rear end, and has a radially expandable expansion portion at the middle portion that is radially expandable by applying internal pressure. Expansion bolts (for example, refer to Japanese Patent Publication No. 1990-520). The expansion bolt is configured such that when an internal pressure is applied after being inserted into a borehole, an expansion part having a cross-sectional shape in which a part of the plastically deformable round pipe is pushed inward expands in the radial direction, thereby closely fitting the borehole.

However, in the case of a steel bolt type rock anchor bolt fixed by a hardening grouting material, there are the following problems.

In order to pour the hardening grouting material into the foundation around the borehole to strengthen it, it is necessary to make a sufficient seal between the pouring pipe and the opening of the drilling hole, and supply the hardening grouting material under high pressure so that the hardening grouting material can fully penetrate the surrounding ground. foundation. However, not only is the sealing difficult, but also the sealing must be performed when the filling tube is inserted, and the sealing must be released when the filling tube is pulled out, so that workability is poor. Especially when there is spring water, even if the hardening grouting material is ready to be poured in, the hardening grouting material will be washed out before hardening, making it difficult to fix the rock anchor bolt. In addition, before the curable grouting material hardens, deformation of the natural foundation tends to occur, and the range of loosening of the natural foundation tends to expand.

On the other hand, in the case of expansion bolts, since it can be fixed without using a hardening grouting material, there is an advantage that the above-mentioned problems do not occur.

However, in the case of this expansion bolt, there is a problem that, when the surrounding ground is weak, even if the expansion part is expanded, the fixing force is still insufficient, so that the reinforcing effect is not good. Although it can be solved by pouring the hardening grouting material into the drill hole like the steel bolt type rock anchor bolt, so that the hardening grouting material penetrates the surrounding foundation and strengthens it, if this is the case, it will happen the same as above. Same problem with steel bolt type rock anchor bolts.

The present invention has been proposed in view of the above-mentioned conventional problems, and its purpose is to strengthen the surrounding foundation by pouring hardening grouting materials while maintaining the advantages of expansion bolts.

Contents of the invention

According to an aspect of the present invention, there is provided an expansion grouting bolt having: an expansion part having a tubular shape to which internal pressure can be applied from a rear end and radially expandable when the internal pressure is applied; A filling opening forming portion opens the filling opening when internal pressure is applied.

The expansion grouting bolt of the present invention can expand the expansion part by applying internal pressure, close contact with the foundation, and open the grouting inlet at the grouting inlet forming part. Moreover, after the close contact with the foundation and the opening of the grouting inlet, it can pass Pour the hardening grouting material from the rear end of the expansion grouting bolt, and pour the hardening grouting material into the surrounding foundation through the above opening.

As mentioned above, the expansion portion of the expansion grouting bolt of the present invention expands and closely adheres to the foundation, thereby sealing the gap between the expansion grouting bolt and the foundation. Therefore, even if spring water exists, water can still be stopped without waiting for pouring and hardening of the hardening grouting material. In addition, through the above-mentioned sealing, the leakage of the hardening grouting material can be prevented, the pouring workability of the hardening grouting material is good, and the surrounding ground can be strengthened by pouring the hardening grouting material, so even for weak foundations, good quality is obtained. the fixed state.

Moreover, since the expansion grouting bolt of the present invention remains as a rock anchor bolt after the hardening grouting material is poured in, the above-mentioned seal is still maintained after the hardening grouting material is poured in, even in the presence of spring water. , can still prevent the outflow of hardened grouting materials. Furthermore, even if the expansion grouting bolt of the present invention is in the weak condition of the surrounding foundation, if the expansion part is expanded and closely attached to the foundation, it is not necessary to pour in and harden the hardening grouting material, so that although it is not sufficient, it can reach a certain degree. Because of the reinforcement effect, it can suppress the loosening of the natural foundation before the hardening grouting material hardens.

The filling port forming part of the expansion grouting bolt according to the present invention is roughly divided into a retaining sleeve which is broken by internal pressure, a cap and a sleeve for the cap which are separated by internal pressure, and other structures. Its details and advantages are described below.

Moreover, the present invention also provides a grouting method, which includes inserting the above-mentioned expansion grouting bolt of the present invention into the foundation, applying internal pressure to the expansion grouting bolt, performing expansion of the expansion portion and opening of the grouting inlet, and supplying the expansion grouting bolt The hardening grouting material is poured around the hardening grouting material through the opened pouring port.

The grouting method of the present invention is a construction method using the above-mentioned features of the expansion grouting bolt of the present invention. As described above, it can prevent spring water from being hardened at an early stage when performing foundation reinforcement work by pouring hardening grouting materials. Prevent the leakage and outflow of hardening grouting materials, and inhibit the loosening of the natural foundation before the hardening grouting materials harden.

Moreover, the embodiment and other advantages of the grouting method of the present invention are described below.

Description of drawings

Fig. 1 shows the first embodiment of the expansion grouting bolt of the present invention, omitting the perspective view of the middle part;

Fig. 2 is a top view of the expansion grouting bolt shown in Fig. 1;

Fig. 3 is a sectional view of the expansion grouting bolt shown in Fig. 1;

Figure 4A and Figure 4B are explanatory views of the front end of the expansion grouting bolt shown in Figure 1, Figure 4A is an enlarged sectional view, and Figure 4B is a front view of the front end;

FIG. 5 is a drawing showing a drilling forming step;

6A and 6B are drawings showing the steps of inserting expansion grouting bolts into boreholes, FIG. 6A is a drawing showing expansion grouting bolts inserted into boreholes, and FIG. 6B is an enlarged cross-sectional view of the expansion portion in FIG. 6A;

7A and FIG. 7B are drawings showing the expansion step of the expansion grouting bolt, and FIG. 7A is a drawing showing the expansion grouting bolt expanding in the borehole, and FIG. 7B is an enlarged cross-sectional view of the expansion part in FIG. 7A;

8A to FIG. 8C are drawings showing the steps of forming the pouring port, FIG. 8A is a drawing showing the expansion grouting bolt opening the pouring port in the drilled hole, and FIG. 8B is an enlarged perspective view of the vicinity of the pouring port forming part shortly before the pouring port is opened. , FIG. 8C is an enlarged perspective view of the vicinity of the filling inlet forming part where the filling inlet has been opened;

Fig. 9 is the accompanying drawing that shows the pouring step of hardenable grouting material;

Fig. 10 is a drawing showing another example of the filling port forming step;

Fig. 11 is a cross-sectional view showing a second embodiment of the filling inlet forming portion;

Fig. 12 is a sectional view showing a third embodiment of the pouring inlet forming portion;

Fig. 13 is a cross-sectional view showing a fourth embodiment of a filling inlet forming portion;

Fig. 14 is a perspective view showing the second embodiment of the expansion grouting bolt of the present invention, omitting the middle part;

FIG. 15 is an explanatory diagram of a case where internal pressure for opening the pouring opening forming portion shown in FIG. 14 is locally applied using a packing member;

Fig. 16 is a perspective view showing the third embodiment of the expansion grouting bolt of the present invention, omitting the middle part;

Fig. 17 is the exterior view showing the fourth embodiment of the expansion grouting bolt of the present invention;

18A and 18B are cross-sectional views of the rear end (the supply side of the hardening grouting material) and the front end (the deepest side of the drilled hole) of the expansion grouting bolt shown in FIG. 17;

Fig. 19A～Fig. 19C are the cross-sectional views of A-A', B-B', C-C' shown in Fig. 18A and Fig. 18B;

Figures 20 to 22 are cross-sectional views of different structural examples of the filling inlet forming part composed of the cover sleeve and the cover, which can be used in the present invention;

Fig. 23 is a cross-sectional view of the front end of the expansion grouting bolt forming the rear end side after being connected and extended;

Fig. 24 is a cross-sectional view of the rear end of the expansion grouting bolt forming the front end side after being connected and extended;

25A and 25B are explanatory diagrams of the connecting portion of the extendable expansion grouting bolts, FIG. 25A is a cross-sectional view of the connecting portion of two expansion grouting bolts, and FIG. 25B is an appearance view of the connecting portion of two expansion grouting bolts;

26A and 26B are respectively sectional views showing examples of the construction of fittings for installation on expansion grouting bolts;

Fig. 27 is a drawing showing a forming step of a borehole;

Fig. 28A and Fig. 28B are the drawings showing the insertion steps of the expansion grouting bolts to the boreholes, Fig. 28A is a drawing showing the expansion grouting bolts inserted into the boreholes, and Fig. 28B is a cross-sectional view of A-A' in Fig. 28A;

Fig. 29A and Fig. 29B are the drawings showing the expansion steps of the expansion grouting bolts, Fig. 29A is a drawing showing the expansion grouting bolts expanding in the borehole, and Fig. 29B is a sectional view of A-A' in Fig. 29A;

Fig. 30 is a drawing showing a filling port forming step, showing a state in which a higher internal pressure is applied to separate the cap;

Fig. 31 is a sectional view near the excavation section in the tunnel engineering using the grouting method of the present invention;

Figure 32 is a front view of the excavation section.

Detailed ways

Hereinafter, the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing the first embodiment of the expansion grouting bolt of the present invention, the middle part is omitted, Fig. 2 is a top view of the expansion grouting bolt shown in Fig. 1, Fig. 3 is a sectional view of the expansion grouting bolt shown in Fig. 1, Fig. 4A 4B and 4B are an enlarged sectional view and an enlarged front view of the front end portion of the expansion grouting bolt shown in FIG. 1 .

As shown in FIGS. 1 to 3 , the expansion grouting bolt 1A of the present embodiment is formed into a tubular shape provided with an inlet sleeve 2 (mouth sleeve) provided at the rear end and an expansion portion 3 integrally connected to the front of the inlet sleeve 2, It is configured that internal pressure can be applied via the inlet sleeve 2 .

The inlet sleeve 2 is in the shape of a circular tube that does not substantially expand in diameter even under internal pressure, and its axis opening communicates with the space in the expansion part 3 . A threaded portion 5 is formed on the inner peripheral surface of the inlet sleeve 2 , which is integrated with the expansion portion 3 via weld seam bulge fusion 4 . The threaded portion 5 is connected to tools used for supplying internal pressure, supplying a curable grouting material, and forming a pouring port 7 (see FIGS. 8A and 8C ) using a drilling tool 6 (see FIG. 10 ), which will be described later. The threaded portion 5 in the illustrated example is formed on the inner peripheral surface of the inlet sleeve 2 , but it may also be formed on the outer peripheral surface.

As can be seen from the cross-section in FIG. 1 , the expansion part 3 depresses a part of the round pipe inwardly in the axial direction, and has a substantially C-shaped cross-section of the depressing part 8 provided with bending and depressing. The inflatable part 3 can be radially expanded by pushing the depressed part 8 outside by applying internal pressure.

The expansion portion 3 of the expansion grouting bolt 1A is made of a plastically deformable material that can expand as described above and maintain the expanded shape after the internal pressure is released. Specifically, metals such as iron, copper, aluminum, or alloys thereof can be used, but in general, steel pipes are preferable in order to obtain good strength. Furthermore, depending on the application, it may be composed of a flexible material such as rubber or synthetic resin, or a material using it as a base material.

The expansion part 3 of this embodiment is connected to the front end from the vicinity of the above-mentioned inlet sleeve 2, and the front end part of the expansion part 3 constitutes the filling opening forming part 9A. The pouring opening forming portion 9A is formed by internal pressure to form the pouring opening 7 for pouring a curable grouting material described later into the foundation (see FIG. 8A and FIG. 8C ). The pouring opening forming portion 9A of this embodiment includes: a breakable holding sleeve Sleeve 10, which is caulked and installed at the front end of the expansion part 3; an embrittlement part (which is not different from other parts in the drawings), which is formed on the expansion part 3 in the caulking installation area of the retaining sleeve 10; and welded The portion 11 (see FIG. 3 and FIG. 4A, FIG. 4B ) closes the front end opening of the inflation portion 3 .

At the two end edges of the retaining sleeve 10 that is caulked at the front end of the expansion part 3, at the corresponding position on the depression opening (a discontinuous part in a substantially C-shape) of the depression part 8 formed on the expansion part 3 , forming the slit 12. Although the slit 12 is not essential, it is preferable to provide it so that the crushing pressure of the retaining sleeve 10 described later can be easily adjusted. The holding sleeve 10 may be made of the same material as the material constituting the expansion part 3, but it may be made of a different material for adjusting the crushing pressure described later.

Specifically, as shown in FIG. 4A and FIG. 4B , the opening at the front end of the expansion part 3 is blocked by the welding part 11 , so that the diameter expansion caused by the push-out of the depressed part 8 can be suppressed. The welding part 11 covers the opening of the front end of the expansion part 3 along the substantially C shape of the front end of the expansion part 3 , spans between the front end of the expansion part 3 and the holding sleeve 10 , and does not connect the depression opening of the depression part 8 . Therefore, if the internal pressure is applied to the expansion part 3, that is, as shown by the arrow in Figure 4B, the front end of the expansion part 3 is not expanded in diameter, but the force is expanded from the depression to both sides, so that the expansion part can pass through the above-mentioned slit 12. , so that the holding sleeve 10 is broken.

Part or all of the front end portion of the expansion portion 3 where the retaining sleeve 10 is installed with gaps constitutes a physically or chemically fragile embrittlement portion (there is no difference from other portions in the drawings). The brittle portion refers to a portion that is easily broken or fractured by breaking the holding sleeve 10 to open the filling port 7 (see FIGS. 8A and 8C ).

The above-mentioned brittle portion can be formed by embrittlement by work hardening such as diameter reduction, embrittlement by heating or cooling, embrittlement by hydrogen or acetylene gas, embrittlement by carburizing or acid or alkali treatment, combinations thereof, etc. . For example, the retaining sleeve 10 can be installed by caulking to reduce the diameter of the expansion portion 3 to form a work-hardened embrittlement portion. Furthermore, the embrittled portion may be formed by utilizing heat when forming the welded portion 11 .

In the present embodiment, by installing the holding sleeve 10 in the vicinity of the bottom of the depressed part 8 that is brittle due to work hardening during its formation, the retaining sleeve 10 is installed until the expansion part 3 is reduced in diameter, and the welded part 11 is provided to further work harden. , forming a brittle part. Also, the vicinity of the bottom of the depressed portion 8 is suitable as a location for forming an embrittlement portion because it is easy to apply a large force by crushing the holding sleeve 10 as described later.

In the expansion grouting bolt 1A of this embodiment, the sealing material 13 is wound around the rear end part near the expansion part 3, and the outer peripheral part near the front end part. As the sealing material 13 , fabrics such as woven fabrics and nonwoven fabrics may be used in addition to elastic materials such as rubber and elastomers. Although the sealing material 13 is an elastic material that can change with the expansion of the expansion part 3, the sealing material 13 can also be closely attached to the outer peripheral surface of the expansion part 3. However, in the case of using cloth or the like, the expansion part 3 can be allowed to expand. The degree of expansion relaxes the winding better. Furthermore, the recess of the depression 8 is preferably fillable.

If the above-mentioned sealing material 13 is provided, the expansion part 3 will be in close contact with the ground through the sealing material 13 as it expands, so the sealing performance can be improved, and the leakage of the hardening grouting material and the spring water gushing can be prevented reliably. In this embodiment, although the sealing material 13 is provided at two places near the rear end and near the front end, it is also possible to provide only the sealing material 13 near the rear end, or to provide the sealing material 13 at three or more places.

The inlet sleeve 2 of the expansion grouting bolt 1A of the present embodiment constitutes a series of expansion parts 3 slightly in front, but the rear end or front end of the expansion part 3 shown in the figure is made into a simple pipe with an appropriate length, and is biased towards the front end. The expansion part 3 is provided on the side or the rear end side, or the expansion grouting bolt 1A having a plurality of expansion parts 3 can be formed by connecting the plurality of expansion parts 3 with a pipe to form an axially interconnected state.

Next, an example of a grouting method of the present invention using the expansion grouting bolt 1A described above with reference to FIGS. 1 to 4A and 4B will be described.

5 to 9 are drawings showing the first embodiment of the sequence of the grouting method of the present invention, FIG. 5 is a drawing showing the forming steps of the borehole, and FIGS. 6A and 6B show the insertion of expansion grouting bolts into the borehole. Figure 6A is a drawing showing the expansion grouting bolt inserted into the drill hole, Figure 6B is an enlarged cross-sectional view of the expansion part of Figure 6A, Figure 7A and Figure 7B are drawings showing the expansion step of the expansion grouting bolt, 7A is a drawing showing an expansion grouting bolt in which an expansion portion is expanded in a borehole, FIG. 7B is an enlarged sectional view of the expansion portion of FIG. 7A , and FIGS. Drawings showing the expansion grouting bolts of the pouring opening in the borehole, FIG. 8B is an enlarged perspective view showing the vicinity of the pouring opening forming part shortly before the opening of the pouring gate, and FIG. 8C is an enlarged perspective view showing the vicinity of the pouring opening forming part of the pouring opening An enlarged perspective view, Fig. 9 is a drawing showing a pouring step of a curable grouting material. In these drawings, the same symbols as those in the above-mentioned FIGS. 1 to 4A and 4B designate the same members or parts.

As shown in FIG. 5 , a drill hole 15 of a desired depth is formed by a drill bit 14 .

After the borehole 15 is formed, as shown in FIG. 6A , the expansion grouting bolt 1A is inserted into the foundation by inserting the expansion grouting bolt 1A into the above-mentioned borehole 15 from the front end side (injection opening forming portion 9A side). In this state, as shown in FIGS. 6A and 6B , the expansion portion 3 of the expansion grouting bolt 1A does not expand, and is inserted into the drilled hole 15 with a margin around the expansion portion 3 and the sealing material 13 .

For inserting the expansion grouting bolt 1A into the foundation, it is not necessary to form the borehole 15. For soft foundations such as clay, it is also possible not to form the borehole 15, but to insert the expansion grouting bolt 1A by directly pushing it in with a hydraulic machine or the like. foundation.

16 shown in FIG. 6A is a fitting for connecting the pressure delivery hose 17 (refer to FIG. 7A ) described later, which has a supply hole 18 for supplying pressure to the expansion grouting bolt 1A, and can be connected to the supply hole 18 state. Connect the pressure delivery hose 17 below. The fitting 16d screw-in part 44 is screwed into and attached to the thread part 5 provided in the inlet sleeve 2 of the expansion grouting bolt 1A. The fitting 16 can be installed before the expansion grouting bolt 1A is inserted into the borehole 15, and can also be performed after the insertion.

Next, as shown in FIG. 7A , the pressure-feeding hose 17 is connected to the above-mentioned fitting 16 , and internal pressure is applied to the expansion grouting bolt 1A from the pressure-feeding hose 17 via the fitting 16 . The internal pressure is applied by means of fluid pressure. Although it can be carried out with pressurized gas such as compressed air, it is generally preferable to use a pressurized liquid that can easily apply a large pressure, especially pressurized water.

As shown in FIG. 7B , the expansion portion 3 of the expansion grouting bolt 1A expands radially by the above-mentioned internal pressure and closely adheres to the inner peripheral surface of the borehole 15, so even if there is spring water in the borehole 15, the spring water can be prevented. gush. In particular, since the sealing material 13 improves the close-adhesive state where the sealing material 13 is provided, the water-stopping effect can be further improved. Moreover, even if the surrounding foundation is fragile, a certain degree of fixing force of the expansion grouting bolt 1A can still be obtained through the expansion of the expansion portion 3 .

The expansion of the above-mentioned expansion part 3 is preferably performed using a pressure lower than the pressure required to open the filling port 7 of the filling port forming part 9A (refer to Fig. 8A and Fig. 8C). The minimum pressure required, but the pressure lower than the pressure that can make the filling port 7 of the filling opening forming part 9A shown in Fig. 8A and Fig. 8C open is better. If the filling port 7 is not completed during the expansion of the expansion part 3 Opening, that is, internal pressure leakage occurs, and it is necessary to supply internal pressure (supply pressurized water) greater than the leakage value, making it difficult to perform expansion work.

After the expansion portion 3 of the expansion grouting bolt 1A has expanded to a required amount, the filling port 7 is opened at the filling port forming portion 9A shown in FIGS. 8A and 8C by supplying a higher pressure.

The opening principle of the filling port 7 in the filling port forming portion 9A described above will be described below.

First, as shown in FIGS. 4A and 4B , although the front end of the expansion part 3 in this embodiment has not expanded its diameter, it can apply a force that expands to both sides of the indentation opening of the indentation part 8, thereby through the above-mentioned Slits 12 break retaining sleeve 10 . Therefore, if a pressure higher than the pressure required to achieve expansion is supplied, that is, as shown in FIG. 8B , at the front end of the expansion part 3, through the above-mentioned slit 12, the holding sleeve 10 is broken, and both sides are opened, and the welded part 11 is opened. As the holding sleeve 10 deforms, the bottom of the depressed portion 8 (see FIG. 1 ) is exposed. Furthermore, under the action of internal pressure, a force in the direction indicated by the arrow in the figure acts on the vicinity of the bottom of the depressed portion 8 . Therefore, by the action of this force, the above-mentioned brittle portion formed near the bottom of the depressed portion 8 is broken, and the filling port 7 shown in FIG. 8C is opened. Since, as described above, especially the vicinity of the bottom of the depressed portion 8 is weakened by work hardening during formation, and is subjected to a large force when the holding sleeve 10 is broken, it is suitable as an embrittled portion.

After the above-mentioned filling port 7 is opened, release the internal pressure (discharge pressurized water) as needed, and supply hardening grout from the inlet sleeve 2 through the pressure feeding hose 17 when the fitting 16 is attached or removed. material. As for the hardening grouting material, for example, aqueous cement suspension, bentonite-water glass suspension, water glass aqueous solution, chrome nigerin aqueous solution, urea resin aqueous solution, acrylic amine aqueous solution, acrylate aqueous solution, urethane resin solution, etc. can be used. , can be selected according to the nature and state of the foundation.

When the hardening grouting material is poured, as mentioned above, the gap between the foundation and the expansion grouting bolt 1A is sealed, so the leakage of the hardening grouting material can be suppressed, and the desired hardening grouting material can be reliably obtained as shown in FIG. 9 . Grouting material is poured into area 19. Moreover, after the grouting is completed, the expansion grouting bolt 1A remains as a locking bolt, so even if there is spring water, the sealing effect of the expansion part 3 after the expansion can still prevent the hardening grouting material from flowing out, thereby realizing the desired result without any mistakes. Improvement of the foundation area is required.

The pouring of the hardening grouting material can be performed by pouring a single type of hardening grouting material, but it is also possible to switch the type of hardening grouting material in the middle and pour multiple kinds of hardening grouting material. Examples of combinations of various hardening grouting materials include hardening grouting materials that have good initial penetration into a wide area, and that have high strength after hardening despite poor penetration into a wide area. Hardening grouting material, seek to improve the surrounding strength, or, in the case of spring water, first pour the hardening grouting material with a short hardening time (gelling time) to suppress the spring water, and then pour hardening grouting material with a long hardening time. The grouting material seeks to infiltrate the surroundings.

Although in the above example, the filling port forming portion 9A is provided with the retaining sleeve 10 , however, a configuration in which the retaining sleeve 10 is not provided is also possible. That is, the above-described configuration in which the holding sleeve 10 is not provided may be adopted. However, it is preferable to select the following structure: the retaining sleeve 10 is provided so as to easily adjust the forming pressure of the filling port 7 (refer to FIG. 8A and FIG. 8C ), and when the forming pressure is greater than the predetermined pressure, the retaining sleeve 10 is broken to make the embrittlement The department is subjected to a large force.

Fig. 10 is a diagram showing another example of the filling port forming step, and the symbols only show the main parts.

In this embodiment, after the drilling step, insertion step and expansion step illustrated in Figs. , insert the rod-shaped hole opening tool 6 into the expansion grouting bolt 1A from the inlet sleeve 2, install the actuating device 20 for actuating the hole opening tool 6 to the inlet sleeve 2, and pass the hole opening tool 6 to the front end of the expansion grouting bolt 1A Pushing is applied to the part to open the filling port 7. In this way, even if the filling port 7 cannot be formed at the filling port forming part 9A by increasing the pressure, the filling port 7 can still be formed without error. Moreover, if the In this filling inlet forming step, even if the filling inlet forming part 9A is not provided in advance, the filling inlet 7 can be forcibly formed with the opening tool 6 after the expansion step, and the subsequent filling steps shown in FIG. 9 can be performed.

In addition to a simple rod, a rod with a sharp front end, a drill-shaped rod, etc. can be used as the drilling tool 6, and a hydraulic device or the like can be used as an actuator. In the case of using the hole opening tool 6, although it is better to expand the axial opening of the rear end portion in order to be easily inserted into the expansion grouting bolt 1A, it is still possible to expand the opening of the rear end portion of the expansion grouting bolt 1A if it is relatively small. After the expansion step, the rear end is cut off, the opening is enlarged, and the hole opening tool 6 is inserted. In particular, if the threaded portion 5 is formed on the inlet sleeve 2, an actuator 20 such as a hydraulic jack can be screwed to the inlet sleeve 2 to withstand the reaction force, and the pressing force can be correctly applied to the drilling tool 6.

Fig. 11 is a cross-sectional view showing a second embodiment of the filling port forming portion.

The filling port forming part 9B of this embodiment closes the filling port 7 previously formed in the expansion part 3 by the plug body 21 .

In the case of the above-mentioned pouring opening forming part 9B, if the plug body 21 is made of a material with less ductility than the material constituting the expansion part 3, and the plug body 21 and the expansion part 3 are integrated by welding or the like, the expansion part can be formed. 3 When inflated, the stress is concentrated on the plug body 21, and when the pressure is further increased, it ruptures to make the filling port 7 open. Moreover, in the case of making a screw-in type that removes the plug body 21 with the required internal pressure, or using pressurized water to supply the internal pressure, the plug body 21 and the expansion part 3 are integrated by a water-soluble adhesive to The supplied pressurized water weakens the bond, causing it to break. The filling opening forming portion 9B of the plug body 21 is not only easily provided at the front end portion of the expansion portion 3 , but is also easily disposed near the rear end or the middle portion of the expansion portion 3 .

Fig. 12 is a cross-sectional view showing a third embodiment of the filling port forming portion.

The filling inlet forming part 9C of the present embodiment is provided with a tubular cover material holding part 22 connected to the front end of the expansion part 3, which will not expand in diameter due to internal pressure. The filling port 7 is closed by a lid member 24 attached to the front end of the lid member holding portion 22 via a ring-shaped lid 23 .

In the case of the filling opening forming part 9C, the cover material 24 can be made to have the strength to rupture under the required internal pressure. After the expansion part 3 expands, the internal pressure is increased to rupture the cover material 24 and open the filling opening 7. . Since the lid material 24 is easily punctured by the punching tool 6 illustrated in FIG. 10 , the filling opening forming portion 9C is particularly suitable for another example of the filling opening forming step illustrated in FIG. 10 .

Fig. 13 is a cross-sectional view showing a fourth embodiment of the filling port forming portion.

The filling inlet forming part 9D of this embodiment uses the same retaining sleeve 10 as shown in FIGS. The retaining sleeve 10 closes the filling opening 7 . Furthermore, slits 12 are formed at both ends of the holding sleeve 10 .

In the case of the above-mentioned filling port forming part 9D, when the expansion part 3 expands, the expansion of the part where the retaining sleeve 10 is caulked is suppressed, so that this part does not expand and expand, and the other expansion part 3 is expanded. After that, the internal pressure is further increased, By keeping the sleeve 10 broken, the filling opening 7 can be opened. Furthermore, in order to securely lock the filling port 7 before the holding sleeve 10 is broken, a gasket (not shown) for sealing the filling port 7 may be interposed between the holding sleeve 10 and the expansion part 3 . The filling opening forming portion 9D of this embodiment is not only easily provided at the front end of the expansion portion 3 , but also at a position near the rear end or in the middle of the expansion portion 3 .

Fig. 14 is a perspective view showing a second embodiment of the expansion grouting bolt of the present invention, omitting the middle part, and Fig. 15 is an explanatory view showing the state of internal pressure partially applied by using a packing member to open the pouring opening forming part shown in Fig. 14, Symbols only show essential parts.

The expansion grouting bolt 1B of the present embodiment locks the front end by the locking cover 25, and in the middle part of the expansion part 3, a plurality of embedded plug bodies 21 are axially arranged at the filling opening forming part 9B of the filling opening 7 formed in advance at appropriate intervals (refer to Figure 15). The filling opening forming part 9B also raises the internal pressure after the expansion part 3 expands, and pops the plug body 21 to open the filling opening 7, which is the same as that shown in FIG. 11 .

On the other hand, in the case of an expansion grouting bolt 1B having a plurality of filling opening forming portions 9B as shown in FIG. The opening period is staggered, and the internal pressure escapes from the opened filling inlets 7, so that not all the filling inlets 7 are opened. In order to prevent the internal pressure from escaping when the filling port 7 is opened, and to selectively make only a part of the filling port 7 open, as shown in FIG. 15 , it is better to use a packing member 26 to locally apply the internal pressure.

To further explain, first, the internal pressure required to expand the inflatable part 3 is applied, and the inflatable part 3 is inflated as shown in FIG. 7B. As a result, the depressed portion 8 expands, and the inner space of the inflated portion 3 expands into a nearly circular shape. In this state, from the inlet sleeve 2 shown in FIG. 14 , insert the pouring pipe 27 (filling pipe with double packing members) shown in FIG. 15 with packing members 26 front and back shown in FIG. 15 into the expansion grouting bolt 1B.

The packing member 26 is a bag expandable by a pressurized fluid such as pressurized water. The filling inlet forming part 9B is interposed between the two packing members 26, and the two packing members 26 are expanded by applying fluid pressure, and the filling inlet forming part 9B is sandwiched between them, thereby adjusting the axial direction of the expansion grouting bolt 1B. Seal front and back. In this state, the pressurized fluid is supplied from the filling pipe 27 to the area clamped by the two packing members 26 to locally pressurize the expansion grouting bolt 1B, thereby surely and selectively making the position clamped by the two packing members 26 The filling port 7 of the filling port forming part 9B is opened. Also, by releasing the pressure of the packing member 26, the pouring pipe 27 to which the packing member 26 is attached can be easily moved in the axial direction of the expansion grouting bolt 1B.

If, as described above, the filling ports 7 are selectively opened from the plurality of filling port forming parts 9B, that is, not only all of the plurality of filling ports 7 can be opened surely, but also only a part of the filling ports 7 can be selectively opened, or via different Fill the entrance 7, pour into different kinds of hardening grouting materials. For example, after opening only the filling port 7 close to the front end and pouring the hardening grouting material, the hardening grouting material in the expansion grouting bolt 1B is washed while it is not hardened, or drilled and removed after hardening, Secondly, make the filling inlet 7 near the rear end open, and according to the need, set up a plug at the front end, and then pour in different hardening grouting materials, and then pour different types of hardening grouting materials along the axial direction of the expansion grouting bolt 1B. Grouting material. Furthermore, the insufficiently inflated inflated portion 3 may be further inflated by local pressurization using the above-mentioned packing member 26 .

Fig. 16 is a perspective view showing a third embodiment of the expansion grouting bolt according to the present invention, with the middle part omitted, and only the essential parts shown by the symbols.

The expansion grouting bolt 1C of the present embodiment has a drill cone 28 at its tip.

If the drilling cone 28 is provided, the drilling cone 28 can be used to form the borehole 15 (see FIG. 5 ) and at the same time insert the expansion grouting bolt 1C into the borehole 15, thereby shortening the working time.

Next, a fourth embodiment of the expansion grouting bolt of the present invention will be described.

Fig. 17 is a drawing showing a fourth embodiment of the expansion grouting bolt of the present invention, and Fig. 18A and Fig. 18B are the rear end (supply side of the hardening grouting material) and the front end (drilled hole) of the expansion grouting bolt shown in Fig. 17 19A to 19C are cross-sectional views of AA', BB', and CC' shown in FIG. 18A and FIG. 18B.

As shown in FIG. 17 and FIGS. 18A and 18B , the expansion grouting bolt 1D of this embodiment has an expansion portion 3 and a filling opening forming portion 9E composed of a cover sleeve 29 and a cover 30 closing the front end of the cover sleeve 29 .

Furthermore, the front end sleeve 31 and the rear end sleeve 32 are respectively caulked and attached to the front end and the rear end of the expansion part 3. In the front end sleeve 31, the rear end of the cover sleeve 29 of the filling opening forming part 9E passes The welded part 33 is integrated with it, and at the rear end sleeve 32, the inlet sleeve 2 is integrated with it through the welded part 34. The same as the example illustrated in Figs. 1 to 4A and 4B, the inner side of the inlet sleeve 2 is formed A member having a threaded portion 5. Also, reference numeral 35 denotes a convex portion for mounting a flat plate 36 for fixing the expansion grouting bolt 1D to the foundation (refer to FIG. 28A ).

As can be seen from the sectional view shown in FIG. 19B , the expansion portion 3 of the expansion grouting bolt 1D of this embodiment is approximately C-shaped, and has a depressed portion 8, which is formed in such a way that the circle is depressed inwardly along the axial direction. part of the tube so that the part is pressed into the round tube. Therefore, the inflatable part 3 can be radially expanded by applying internal pressure to the inner space of the inflatable part 3 to push the depressed part 8 outward.

As shown in FIG. 19A , in order to prevent the internal pressure from leaking to the outside when the internal pressure is applied to the expansion grouting bolt 1D, and to suppress the diameter expansion, a space between the depressed portion 8 at the rear end of the expansion part 3 and the rear end sleeve 32 is The outer space of is filled by weld 37. Furthermore, as shown in FIG. 19C , in order to suppress diameter expansion, the external space between the depressed portion 8 at the front end of the expansion portion 3 and the front end sleeve 31 is filled with a welded portion 38 .

The constituent material of the expansion portion 3 of the expansion grouting bolt 1D according to the present embodiment is the same as that of the expansion grouting bolt 1A described in FIGS. 1 to 4A and 4B.

The filling inlet forming part 9E formed by the cover sleeve 29 and the cover 30 installed at the front end of the expansion grouting bolt 1D of this embodiment is an integrally formed body, and the wall thickness between the cover sleeve 29 and the cover 30 is very thin, which can This thin portion is crushed by internal pressure, and the cover 30 is separated from the cover sleeve 29 to open the filling port 7 at the front end of the expansion grouting bolt 1D.

The cover sleeve 29 and the cover 30 can be made of the same material as the above-mentioned expansion part 3, and can be configured to pass a predetermined internal pressure, specifically, an internal pressure higher than the internal pressure required for expansion of the expansion part 3. The cap 30 may be separated from the cap sleeve 29 . Furthermore, the form of connection to the expansion part 3 is not limited to welding.

20 to 22 show cross-sectional views of different structural examples of the filling opening forming portion composed of a cap sleeve and a cap that can be used in the present invention.

The filling inlet forming portion 9E in FIG. 20 has a synthetic resin cap 30 with threads on the outer wall for screwing into a metal cap sleeve 29 with threads on the inner wall. The filling opening forming part 9E of FIG. 21 has a synthetic resin cap 30, and the outer wall of the synthetic resin cap 30 is provided with a screw thread for inserting a cap sleeve 29, so as to prevent the cap from colliding during transportation or operation. 30 damage. Both of the filling inlet forming portions 9E in FIGS. 20 and 21 utilize the flexibility and elasticity of the synthetic resin constituting the cap 30 to separate the cap 30 from the cap sleeve 29 . Fig. 22 shows that the thickness of the front end of the synthetic resin cover sleeve 29 provided with threads on the outside is made very thin, and a sphere 39 is arranged inside, and the sphere 39 flies out of the outside by internal pressure, so that the filling port 7 is opened. . For example, polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene) resin, PET (polyethylene terephthalate), polycarbonate, etc. can be used as the material constituting the cover 30 shown in FIGS. 20 to 22 described above. Synthetic resin.

One feature of the expansion grouting bolt 1D using the filling opening forming portion 9E constituted by the cover sleeve 29 and the cover 30 is that it can be easily modified so that two or more can be connected for extension. This feature will be described using FIGS. 23 to 25A and 25B.

Fig. 23 is a cross-sectional view of the front end of the expansion grouting bolt forming the rear end side after connection and extension; Fig. 24 is a cross-sectional view of the rear end of the expansion grouting bolt forming the front end side after connection and extension; As explanatory diagrams of the connection part of the bolt, FIG. 25A is a sectional view of the connection part of two expansion grouting bolts, and FIG. 25B is an external view of the connection part of two expansion grouting bolts.

As shown in FIG. 23, a threaded extension front sleeve 40 is installed at the front end sleeve 31 of the expansion grouting bolt 1D in FIG. The grouting bolt 1D' replaces the cover sleeve 29 and the cover 30. On the other hand, as shown in FIG. The rear end sleeve 41 for extension of the thread corresponding to the thread of the front end sleeve 40 is used to form the front end side expansion grouting bolt 1D" which constitutes the front end side after the connection is extended, instead of the inlet sleeve 2.

As shown in FIG. 25A, by screwing the front end sleeve 40 for extension and the rear end sleeve 41 for extension, the rear end side expansion grouting bolt 1D' and the front end side expansion grouting bolt 1D" are connected to connect the inside through the flow paths 42 and 43. The state of the space constitutes a series of expansion grouting bolts (not shown).

The expansion grouting bolt 1D using the filling opening forming portion 9E constituted by the cover sleeve 29 and the cover 30 can be easily improved so that not only two connections can be extended, but also three or more connections can be extended.

Specifically, the front end sleeve 40 for extension is attached to the front end of the expansion grouting bolt 1D in FIG. At the end, instead of the inlet sleeve 2, the intermediate expansion grouting bolt part is used as the middle part for extension. Furthermore, it can be extended to a desired length by arranging one or more intermediate expansion grouting bolts between the rear end side expansion grouting bolt 1D' and the front end side expansion grouting bolt 1D" shown in FIGS. 23 and 24 . In the present invention, both the front-end sleeve 40 for extension and the rear-end sleeve 41 for extension can be respectively provided as extension members, and the extension operation only needs to screw the front-end sleeve 40 for extension and the rear-end sleeve 41 for extension. Yes, so the work can be carried out on site, and the length before the extension is maintained during the transportation before arriving at the site.

Next, the grouting method according to the present invention using the expansion grouting bolt 1D illustrated in FIG. 17 will be described with reference to FIGS. 26A, 26B to 30 .

26A and FIG. 26B are cross-sectional views showing an example of the structure of an accessory mounted on an expansion grouting bolt, FIG. 27 is a drawing showing a drilling procedure, and FIGS. 28A and 28B are illustrations showing insertion of an expansion grouting bolt into a drilling hole. Figure 28A is a drawing showing the expansion grouting bolt inserted into the drill hole, Figure 28B is a cross-sectional view of AA' in Figure 28A, Figure 29A and Figure 29B are drawings showing the expansion step of the expansion grouting bolt, Fig. 29A is a drawing showing an expansion grouting bolt expanded in a borehole, Fig. 29B is a cross-sectional view of AA' of Fig. 29A, Fig. 30 is a drawing showing a step of filling an opening, and is a drawing showing the application of a higher A drawing showing the state where the lid is separated by internal pressure.

First, as shown in FIG. 27, a borehole 15 is formed in the foundation. For the formation of the drill hole 15, a generally used drilling slide drill or the like can be used.

After the borehole 15 is formed, as shown in FIG. 28A, the expansion grouting bolt 1D is inserted into the above-mentioned borehole 15 by inserting from the front end side (cover 30 side), thereby inserting into the foundation, wherein the expansion grouting bolt 1D has a flat plate 36, which The flat plate 36 is inserted into the position of the protrusion 35 . In this state, as shown in FIGS. 28A and 28B , the expansion portion 3 of the expansion grouting bolt 1D does not expand, and is inserted into the borehole 15 with a margin between the expansion portion 3 and the inner wall of the borehole 15 .

Next, as shown in FIG. 29A , a fitting 16 is attached to the inlet sleeve 2 , a pressure feeding hose (not shown) is connected to the fitting 16 , and internal pressure is applied to the expansion grouting bolt 1D. This internal pressure is applied as fluid pressure. Although it can also be performed by pressurized gas such as compressed air, it is generally preferable to use pressurized liquid, especially pressurized water, which is easy to apply a large pressure.

As shown in FIG. 26A , the fitting 16 is a member having a screw-in portion 44 which can be mounted to the expansion grouting bolt 1D by screwing the screw-in portion 44 to the inlet sleeve 2 of FIG. 17 . The fitting 16 has a supply hole 18 for supplying pressure into the expansion grouting bolt 1D, and is configured to connect a pressure feeding hose (not shown) while communicating with the supply hole 18 . The fitting 16 can be installed before inserting the expansion grouting bolt 1D into the drilled hole 15, or after inserting it. Moreover, as shown in Fig. 26B, the inlet sleeve 2 may not be used, and the fitting 16' not provided with the screw-in portion 44 may be directly welded at the rear end sleeve 32.

As shown in Figure 29B, the expansion grouting bolt 1D radially expands the expansion part 3 by the above-mentioned internal pressure, and closely adheres to the inner wall of the borehole 15, so even if there is spring water in the borehole 15, the water can still be stopped. Moreover, even if the surrounding foundation is relatively fragile, the expansion grouting bolt 1 can still obtain a certain degree of fixing force through the expansion of its expansion part 3.

The expansion of the above-mentioned expansion part 3 is preferably performed at a pressure lower than the pressure at which the cap 30 is separated from the cap sleeve 29 . If the expansion part 3 is fully inflated, the cover 30 is separated from the cover sleeve 29, and the internal pressure leaks from the opening, and an internal pressure (supply of pressurized water) larger than the leakage value must be supplied, which makes it difficult to Do expansion work.

After expanding the expansion part 3 of the expansion grouting bolt 1D by a necessary amount, by supplying a higher pressure, as shown in FIG. Open.

Thereafter, after the internal pressure is released as required (after the pressurized water is discharged), hardening grout is supplied from the inlet sleeve 2 via a pressure feeding hose (not shown) with or without the fitting 16 installed. material. This hardening grouting material has already been described in the example of the grouting method using the expansion grouting bolt of the first embodiment.

When pouring the hardening grouting material, as described above, the gap between the foundation and the expansion grouting bolt 1D is sealed, so the hardening grouting material can be suppressed from leaking out, and the hardening grouting material can be poured into the hole 15. deepest part. And since the expansion grouting bolt 1D remains as a rock anchor bolt after the pouring is completed, even if there is spring water, it can still prevent the hardening grouting material from flowing out through the expansion seal of the above-mentioned expansion part 3, thereby realizing the desired effect without fail. Improvements to the foundation area.

Although in this embodiment, the pouring of the hardening grouting material can be performed by pouring a single type of hardening grouting material, however, it is also possible to change the type of hardening grouting material on the way to pour a variety of hardening grouting materials. material. The example of the combination of several hardening grouting materials was demonstrated in the example of the grouting method using the expansion grouting bolt which concerns on 1st Embodiment.

Fig. 31 is a sectional view near the excavation section in the tunnel engineering using the grouting method of the present invention, Fig. 32 is a front view of the excavation section, 101 is the expansion grouting bolt of the present invention, 102 is the pouring area of hardening grouting material, and 103 is Excavation section face.

As shown in the figure, the grouting method using the expansion grouting bolt 101 of the present invention can be used for foundation stabilization of the excavation section surface 103 in tunnel engineering, reinforcement of the ceiling near the excavation section surface 103, and arched concrete feet constituting the inner wall of the tunnel. reinforcement etc. In tunneling, the expansion grouting bolts 101 are inserted into the foundation surface immediately after excavation, and the hardening grouting material is poured, so as to stabilize the foundation of the excavated tunnel and stabilize the foundation to be excavated.

The foundation surface just exposed after excavation is prone to loosening. Therefore, when the hardening grouting material is poured, loosening occurs easily near the entrance of the drilled hole where the expansion grouting bolt 101 is inserted, and leakage of the hardening grouting material occurs.

However, according to the present invention, as described above, the expansion part can be inflated so as to closely adhere to the inner surface of the drilled hole for sealing. In addition, since the spring water can also be sealed at the same time, the work efficiency can be greatly improved for tunnel projects that require repeated excavation and foundation reinforcement.

Claims (24)

1. grouting bolt that expands, it has bulge, and this bulge has tubular form, can fluidly apply interior pressure from rearward end, expanded radially during pressure during fluidly applying; And by pressing the interruption-forming portion that pours into that pours into mouthful opening that makes in fluidly applying.

2. expansion as claimed in claim 1 grouting bolt, wherein, the inside side pressure of a part that bulge has vertically the pipe of plastically deformable falls into to form the structure of depression part.

3. expansion grouting bolt as claimed in claim 2, wherein, the grouting bolt that expands constitutes bulge at its leading section at least, pours into interruption-forming portion and has: the weld portion that is used to seal, its front end of allowing this bulge opens from the pressure swallow both sides of depression part, and can suppress hole enlargement; And embrittlement portion, it is located near the depression part this weld portion, splits by interior crushing, and makes to pour into a mouthful opening.

4. expansion as claimed in claim 3 grouting bolt wherein, pours into interruption-forming portion and has the maintenance sleeve, and its calking is installed on the bulge outside wall surface of the position of corresponding embrittlement portion, and fragmentation is broken embrittlement portion by interior pressure, pours into interruption-forming portion opening thereby make.

5. expansion grouting bolt as claimed in claim 2, wherein, pour into interruption-forming portion and have: pour into mouth, it is pre-formed in bulge; And key, its inaccessible this pours into mouth, makes this pour into a mouthful opening by interior pressure.

6. expansion grouting bolt as claimed in claim 2, wherein, pour into interruption-forming portion and have: pour into mouth, it is pre-formed in bulge; And the maintenance sleeve, its closely connected this pours into mouth, and calking is installed on the bulge outside wall surface, makes the bulge fragmentation by interior pressure, so that pour into interruption-forming portion opening.

7. expansion grouting bolt as claimed in claim 1, wherein, the sealing material is wound in the bulge outside wall surface.

8. expansion grouting bolt as claimed in claim 1, wherein, rearward end constitutes the inlet sleeve towards axially open.

9. expansion grouting bolt as claimed in claim 1 also is provided with the boring burr-drill at front end.

10. expansion grouting bolt as claimed in claim 2, wherein, pour into interruption-forming portion and have: lid is used sleeve, and it is installed on rearward end the leading section of bulge; And lid, its locking should lid with the front end of sleeve, and during applying, during pressure, separate with sleeve from this lid.

11. expansion grouting bolt as claimed in claim 10 also comprises the front end sleeve of the leading section that is installed on bulge, and the rearward end of lid with sleeve is installed on this front end sleeve.

12. expansion as claimed in claim 10 grouting bolt, wherein, lid is one-body molded with lid with sleeve, and the wall thickness of the connecting portion of the two forms thin than other position, and when during applying, pressing, this connecting portion fragmentation, lid separates with sleeve from covering.

13. expansion grouting bolt as claimed in claim 10, wherein, lid is made by synthetic resin, is mounted to bury in lid with in the sleeve.

14. expansion as claimed in claim 11 grouting bolt also comprises the rear end sleeve of the rearward end that is installed on bulge, in the rearward end of this rear end sleeve inlet sleeve towards axially open is installed.

15. expansion grouting bolt as claimed in claim 2, comprise and prolong the rear end side expansion grouting bolt part that is installed on the bulge front end with the front end sleeve, and prolong the front that is installed on the bulge rear end with the rear end sleeve grouting bolt part that expands, wherein expand grouting bolt part and front of rear end side expands the inner space of grouting bolt part via prolonging with the front end sleeve and prolonging with rear end sleeve and connection continuously.

16. expansion grouting bolt as claimed in claim 15, wherein, expand between grouting bolt part and the front expansion grouting bolt part in rear end side, connect at least one intermediate expansion grouting bolt part, the prolongation of this intermediate expansion grouting bolt part is with the front end sleeve and prolong front end and the rear end of being located at bulge with the rear end sleeve respectively.

17., wherein, pour into interruption-forming portion by than making the bulge higher pressure of required minimum pressure that expands make and pour into a mouthful opening as arbitrary described expansion grouting bolt in the claim 1 to 16.

18. a grouting method comprises;

Use has bulge and pours into the expansion grouting bolt of interruption-forming portion, wherein bulge has the tubulose that can press in rearward end fluidly applies, expanded radially when pressing in fluidly applying pours into interruption-forming portion and pours into a mouthful opening by pressing to make in fluidly applying;

The grouting bolt that should expand inserts in the ground;

Be pressed on the grouting bolt that expands in fluidly applying, bulge is expanded, and make and pour into a mouthful opening;

To the grouting bolt supplying hardening grouting material that expands; And

Via the mouth that pours into of opening, hardening is in the milk around material pours into.

19. grouting method as claimed in claim 18, wherein, the interruption-forming portion that pours into of expansion grouting bolt has calking and is installed in the bulge outside wall surface, split so that pour into the sleeve of mouthful opening by interior crushing, after bulge is expanded, apply higher interior the pressure, make the sleeve fragmentation, so that pour into a mouthful opening.

20. grouting method as claimed in claim 18, wherein, the interruption-forming portion that pours into of the grouting bolt that expands has: lid is used sleeve, and the end is installed on the leading section of bulge thereafter; And lid, its locking should lid with the front end of sleeve, and during applying, during pressure, separate with sleeve from this lid; After bulge is expanded, apply higher interior the pressure, lid is separated, so that pour into a mouthful opening with sleeve from lid.

21. a grouting method comprises:

Use possesses the expansion grouting bolt of bulge, and this bulge forms and can fluidly apply interior tubulose of pressing towards the inlet sleeve of axially open via being located at rearward end, and by pressing expanded radially in fluidly applying;

The grouting bolt that should expand inserts in the ground;

Being pressed on the grouting bolt that expands in fluidly applying expands bulge;

The inlet sleeve of self-expanding grouting bolt inserts drilling tool, forms on the grouting bolt that expands and pours into mouth;

To the grouting bolt supplying hardening grouting material that expands; And

Via pouring into mouth, hardening is in the milk around material pours into.

22. grouting method as claimed in claim 18 wherein, uses the expansion grouting bolt that has the boring burr-drill at its front end, in boring, the grouting bolt that should expand inserts boring.

23. a grouting method comprises:

Use a kind of expansion grouting bolt, this expansion grouting bolt has: form the tubulose that can press and the body of expanded radially during pressure in fluidly applying from rearward end fluidly applies in, and lid and sleeve, lid separates with sleeve when pressing in fluidly applying, the sleeve that also has lid, this sleeve is installed on the leading section of body;

This expansion grouting bolt is inserted the boring that is formed at ground;

Be pressed on the grouting bolt that expands in fluidly applying, make this volume expansion;

Fluidly apply higher interior the pressure, the lid of leading section is separated;

Supply with hardening grouting material in the grouting bolt that expands, thereby the hardening material that is in the milk is poured in the boring from leading section.

24., wherein, switch the kind of the hardening grouting material that being supplied to the grouting bolt that expands in operation as arbitrary described grouting method in the claim 18 to 23.

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