JP2012241366A - Construction method of adhesive anchor using capsule for fastening anchor body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of adhesive anchor using a capsule for fastening anchor body, which enables even an inexperienced worker to easily conduct construction work and can achieve a uniform anchor performance.SOLUTION: A capsule for fastening anchor body, which consists of an inner tube containing cement powder and an outer tube containing viscosity hardening agent made of water, bodying agent and the like, is inserted in a hole (anchor hole). Mortar is produced as an anchor body crushes the inner and outer tubes and stirs their contents. In burying and fixing the anchor body in the mortar, the clearance between the hole and the anchor body is 15 to 30% of the nominal diameter of the anchor body, and when crushing and stirring are done by rotation and hammering, the volume of mortar per rotation in the accumulated number of anchor body rotations is 700 mm/rotation or less, and the volume of mortar per hammering in the accumulated number of anchor body hammerings is 90 mm/hammering or less.

Description

  The present invention uses an inorganic anchor body fixing capsule in which one glass tube containing cement powder and the other glass tube containing water or a thickener are arranged in a double tube structure. The present invention relates to a method for constructing an adhesive anchor.

  A hammer drill, etc., on the concrete surface to fix machinery or parts on a concrete floor or wall, or to attach a hanging bolt for piping or a double ceiling (also called full screw bolt, cut) to the ceiling As a form of so-called post-installed anchors, in which perforations are formed and anchor bolts are fixed, adhesive anchors are widely used. This adhesive anchor includes an adhesive anchor using an organic capsule in which a thermosetting resin such as an epoxy resin composed of a main agent and a curing agent is enclosed in a double glass tube structure, and cement powder. There is an adhesive anchor using an inorganic capsule made of an inorganic material such as a hardener.

  However, the adhesive anchor using the former organic capsule has a drawback in terms of fire resistance because the component is basically flammable. For this reason, in recent years, adhesive anchors using the latter inorganic capsules have attracted attention.

  This type of inorganic capsule has a double-pipe structure made of glass and plastic tubes, with cement powder on the inner tube side and water and thickener on the outer tube side, and vice versa. Known is one in which cement powder is sealed on the outer tube side and water or a thickener is sealed on the inner tube side. In this case, aggregates such as sand are blended in one of the tubes.

  In the construction method of such an adhesive anchor using an inorganic capsule, such an inorganic capsule is inserted into a perforation formed on a concrete wall surface, and then a deformed reinforcing bar attached to a tool such as a hammer drill or all screw bolts. The anchor body is rotated and vibrated, and the contents such as cement powder, water, sand, thickener and the like are stirred and mixed while the glass tube inside and outside the inorganic capsule is crushed by the rotation and impact. In this case, a crushed glass tube is also used as an aggregate (see, for example, Patent Documents 1 and 2).

JP-A-5-39639 Japanese Utility Model Publication No. 6-85432

  However, in the construction method of the adhesive anchor using the above-described inorganic capsule, the glass tube of the inorganic capsule is crushed by the combined use of rotation and striking of the anchor body mounted on a hammer drill or the like. The number of body rotations and the number of hits are basically based on the experience and intuition of the workers on site. For this reason, the anchor performance such as tensile strength and shear strength of the anchor body after fixing tends to vary due to this. That is, the conventional construction method has a problem that it is difficult to stably secure uniform anchor performance.

  The cause of such variation is primarily due to insufficient crushing of the glass tube by the anchor body and stirring and mixing of the contents. Another cause is that when the glass tube is crushed by the anchor body, cement powder, water, etc. are scattered from the perforations to the outside, and a part of the mixture that is not sufficiently stirred overflows from the perforations. It is. This is because in such a case, cement powder, sand, water, and the like encapsulated at a predetermined blending ratio are cured in an unbalanced state.

  Therefore, the present inventors have arrived at the present invention as a result of intensive studies on the conditions of use of the tool and the drilling diameter. In other words, the anchor body anchor capsule attached to the tool is surely crushed or crushed, and the contents of each capsule can be sufficiently stirred and mixed to produce a homogeneous mortar. An object of the present invention is to provide a method for constructing an adhesive anchor using a capsule for anchoring an anchor body, which can achieve uniform anchor performance while suppressing the above.

In order to achieve the above object, the invention according to claim 1 of the present application provides an anchor body in which one glass tube containing cement powder and the other glass tube containing water or the like are arranged in a double tube structure. The fixing capsule is inserted into a drilled concrete structure that has been drilled to a predetermined depth. After that, each glass tube is crushed by rotating and hitting the anchor attached to the tool, and the contents are stirred and mixed. A method of constructing an adhesive anchor using a capsule for anchoring an anchor body, in which a mortar is generated and the end of the anchor body is buried in a mortar filled in the perforation, and the anchor body is fixed. The clearance between the anchor body is 15-30% of the outer diameter of the anchor body, and the relationship between the cumulative rotational speed until the anchor body reaches the bottom of the perforation and the capacity of the mortar, 300 mm ^3/1 is the rotation or less, and the relationship between the capacitance of the mortar and the cumulative number of strikes of the anchor body is not more than 90 mm ^3/1 blow is characterized by. According to this method, by hitting the rotation, the inner and outer glass tubes, which are containers for anchoring the anchor body, are crushed or crushed and the contents are stirred and mixed to produce homogeneous mortar. This makes it possible to achieve uniform anchor performance while suppressing variations in anchor performance after fixing.
Here, in the case of downward construction in which a gap portion exists on one end side of each glass tube of the anchor body fixing capsule and the anchor body fixing capsule is inserted from above the perforation, the gap portion of each glass tube However, both of them may be inserted into the perforations so as to be on the lower side (Claim 2). In this case, when the contents inside and outside the glass tube are densely accumulated on the upper side of the capsule and the anchor body fixing capsule is crushed, the liquid component such as water is surely separated from the capsule fragments, cement powder, etc. It is possible to form a high-quality mortar by wrapping the particulate matter and reducing the scattering of the perforations to the outside.

  According to the construction method of the adhesive anchor using the capsule for anchoring the anchor body of the present invention, the capsule for anchoring the anchor body is surely crushed or pulverized by rotation and impact of the anchor body, even if it is not a skilled worker, Thorough stirring and mixing of the objects becomes possible, and dispersion of performance such as tensile strength and shear strength of the anchor after fixing is suppressed, and uniform anchor performance can be achieved.

(A), (b) is the fragmentary sectional view and sectional drawing of the capsule for anchor body fixation applied to the construction method of the adhesion type anchor using the capsule for anchor body fixation of this embodiment, respectively. (A), (b) is a perspective view which shows an example of the anchor body applied to the construction method of the adhesive anchor using the capsule for anchor body fixation of this embodiment, respectively. (A)-(g) is explanatory drawing which shows an example of the construction method of the adhesive anchor using the capsule for anchor anchors of this embodiment, respectively. Sample No. used in the experiment of this embodiment (an experiment in which the anchor body fixing capsule is crushed by rotation and impact of the anchor body). It is a table | surface which shows the conditions of 1-19. It is a table | surface which shows the kind of tool used in experiment of this embodiment, the rotation speed per minute of each tool, and the hit | damage number per minute. Sample No. 2 shown in FIG. It is a table | surface which shows the result of the experiment using 1-19. It is a graph which shows the relationship between the value of the mortar capacity | capacitance per accumulation | damage number of times of impact of the anchor body in experiment, and a pass / fail result. It is a graph which shows the relationship between the value of the mortar capacity | capacitance per accumulation rotation number of the anchor body in experiment, and a pass / fail result.

  Next, an embodiment of a method for constructing an adhesive anchor using the anchor body fixing capsule according to the present invention will be described.

≪Example of capsule structure for anchor anchoring≫
First, an example of the structure of the anchor body fixing capsule used in this embodiment will be described.

  FIGS. 1A and 1B are a partial cross-sectional view and a cross-sectional view, respectively, of an anchor body fixing capsule 1 used in the method for constructing an adhesive anchor using the anchor body fixing capsule of the present embodiment. is there.

  As shown in FIGS. 1A and 1B, an anchor body fixing capsule 1 according to this embodiment includes a hollow cylindrical outer tube 2 and a hollow cylindrical inner tube provided inside the outer tube 2. A double tube structure with the tube 3 is used.

  Both the outer tube 2 and the inner tube 3 are made of a material that can be crushed by an anchor body, such as glass or plastic. In the present embodiment, it will be described as being made of glass.

  The inner tube 3 is configured such that its axial length is shorter than that of the outer tube 2 and its outer diameter is smaller than that of the outer tube 2, and the axial length of the outer tube 2 is within the outer tube 2. Contained in the direction. In the present embodiment, the inner pipe 3 is filled with a cement powder A that is nonflammable and excellent in heat resistance as compared with an organic material such as an epoxy resin. Here, in the present embodiment, the amount of the cement powder A enclosed in the inner tube 3 is such that the shaft of the inner tube 3 is in the state where the anchor body fixing capsule 1 is upright as shown in FIG. By setting the cement powder A closer to the lower end portion in the long direction, the gap X is set to be generated on the upper end portion 3b side in the axial length direction of the inner tube 3. The amount of cement powder A enclosed may be set to the full capacity of the inner tube 3.

  The outer tube 2 is sealed after the inner tube 3 is inserted therein and the surroundings of the inner tube 3 are filled with the viscous hardening material B. As a result, the inner tube 3 is built in the outer tube 2 and the viscous curable material B is enclosed. The viscous curable material B is prepared, for example, by mixing water, an aggregate such as sand, and a thickener made of a water-soluble resin such as carboxymethylcellulose.

  The amount of the viscous curable material B enclosed in the outer tube 2 is set smaller than the capacity of the outer tube 2 as shown in FIG. In the present embodiment, as shown in FIG. 1B, the viscous curable material B is formed on the inner pipe on the lower end 2a side in the axial length direction of the outer pipe 2 by setting up the anchor body fixing capsule 1 or the like. 3 and the viscous hardening material B are brought close together, and the lower end portion 3a of the inner tube 3 in the axial length direction pushes the viscous hardening material B and substantially overlaps the lower end portion 2a of the outer tube 2 in the axial length direction. It is set to such an extent that a gap Y is generated at the upper end 2b in the direction.

  Here, in this embodiment, the inner tube 3 built in the outer tube 2 is restrained from moving inside the outer tube 2 due to the viscosity of the viscous hardened material B, and is difficult to move. Therefore, for example, when the anchor body fixing capsule 1 is stored in an upright state, the inner tube 3 moves down in the outer tube 2 by pushing out the viscous hardener B with the weight of the cement powder A itself. As shown in FIG. 1 (b), the lower end portion 3a in the axial length direction is stabilized in a state where the lower end portion 3a of the outer tube 2 is in contact with the lower end portion 2a in the axial length direction. Of course, if the anchor body fixing capsule 1 is vigorously shaken, the inner tube 3 moves.

  Moreover, in this embodiment, the both ends 2a, 2b, 3a, 3b of the outer tube 2 and the inner tube 3 are flat as shown in FIGS. 1 (a) and 1 (b). This is because when the tip of the anchor body hits, if the shape of both end portions 2a, 2b, 3a, 3b is a dome shape such as a hemisphere, the anchor body slides sideways, and the outer tube 2 and the inner tube 3 This is because there is a possibility that it cannot be reliably crushed. Moreover, if it is flat shape, it is because the edge part of the anchor body fixing capsule 1 is easy to crush finely rather than dome shape. However, in the present invention, both end portions of the outer tube 2 and the inner tube 3 are not limited to flat ones, and may be hemispherical.

≪Example of anchor body≫
Next, an example of the anchor body used in this embodiment will be described.

  FIGS. 2A and 2B are perspective views showing an example of an anchor body 4 used in the method of constructing an adhesive anchor using the anchor body fixing capsule of the present embodiment.

  In this embodiment, as the anchor body 4, a deformed reinforcing bar (as shown in FIG. 2A) is expected in order to expect a fixing (adhesion) force with the mortar formed by crushing and mixing the anchor body fixing capsule 1. Bamboo joints, screw joints, etc.) 4a and all screw bolts 4b as shown in FIG. 2B are used. Then, the tip 41 of the anchor body 4 is formed so that the outer tube 2 and the inner tube 3 constituting the anchor body fixing capsule 1 can be finely crushed or pulverized and stirred as shown in FIG. , (B), for example, it is cut at 45 degrees with respect to the axial center. Thereby, when the anchor body 4 attached to the tool rotates, the glass tube of the outer tube 2 and the inner tube 3 is finely crushed or crushed by the tip portion 41 of the anchor body 4 cut by 45 degrees, and the contents are Rolled up and stirred.

  In the present embodiment, the attachment is optional, but a mortar leakage suppressor 42 such as an O-ring (see FIGS. 3 (f) and 3 (g) described later) may be attached to the anchor body 4. good. Since the mortar leakage suppression tool 42 is detained at a predetermined position of the anchor body 4, an elastic body or the like having an inner diameter smaller than the outer diameter of the anchor body 4 and an outer diameter larger than the inner diameter of the perforation formed in the concrete frame. use. In addition, the external shape of the mortar leakage suppression tool 42 may not be circular. Thereby, since the gap between the anchor body 4 and the perforation is closed by the mortar leakage suppressing tool 42, unnecessary leakage of the mortar can be prevented. Further, as the anchor body 4 rotates, the mortar that has risen to the vicinity of the opening of the perforation is dammed and pushed back downward, so that the mortar is more mixed up and down and stirred. The mortar leakage suppressing tool 42 is desirably elastic. If the mortar leak suppressor 42 is not an elastic material, the mortar may leak from the gap between the mortar leak suppressor 42 and the anchor body 4, and the gap is made as small as possible to reduce leakage. However, it is because there is a high possibility that the workability is lowered, for example, the mortar leakage suppressing tool 42 is caught on the irregularities on the surface of the anchor body 4 at the time of construction and the movement becomes difficult.

≪Example of construction method of adhesive anchor using capsule 1 for anchor anchoring≫
Next, an example of the construction method of the adhesive anchor of this embodiment using the anchor body fixing capsule 1 will be described.

  FIGS. 3A to 3G are explanatory views showing an example of a method for constructing the adhesive anchor of the present embodiment using the anchor body fixing capsule 1.

(1) Perforation (FIG. 3 (a))
First, as shown in FIG. 3A, a perforation 51 is formed in the concrete housing 5 by a hammer drill or the like. The perforation diameter is made larger than the outer diameter of the anchor body 4 or the anchor body fixing capsule 1. Here, in the present embodiment, the clearance is (the perforation diameter D−the nominal diameter d of the anchor body 4), and the ratio of the clearance to the nominal diameter d of the anchor body 4, that is, the clearance ratio (D−d) / d is Although it is a value clarified in another experiment, it is set to 15 to 30%. This is because when the clearance ratio (Dd) / d is less than 15%, the anchor body 4 is crushing the anchor body fixing capsule 1 and the inner wall surface of the perforation (anchor hole) 51 and the outer periphery of the anchor body 4 A piece of glass that is not sufficiently crushed is clogged with the surface, and the anchor body 4 is in a high-rest state in which further work cannot be continued before the tip of the anchor body 4 reaches the lower end of the perforation. The workability during stirring is reduced. On the other hand, if the clearance ratio exceeds 30%, the glass tube easily escapes inside the perforation 51, and therefore, there is a problem that it is difficult to form a finely crushed material and the strength expression is hindered due to a decrease in the homogeneity of the mortar. . In the present embodiment, a tool such as a drill used for drilling and a tool used when inserting the anchor body 4 after that may be different, but basically the same tool is used. use.

(2) Cleaning inside perforation (anchor hole) (FIGS. 3B to 3D)
Next, as shown in FIGS. 3 (b) to 3 (d), for example, the inside of the perforation (anchor hole) 51 is perforated (anchor hole) by the procedure of blower (suction) → brushing with the brush 52 → blower (suction). Clean inside 51 thoroughly.

(3) Insertion of anchor body fixing capsule 1 (FIG. 3E)
Next, as shown in FIG. 3E, the anchor body fixing capsule 1 is inserted into the perforated (anchor hole) 51 after cleaning. The outer diameter of the anchor body fixing capsule 1 is preferably equal to or smaller than the outer diameter (nominal diameter) of the anchor body 4, more preferably slightly smaller than the outer diameter of the anchor body 4. In the anchor body fixing capsule 1, as described in the explanation of FIG. 1, cement powder A such as early-strength cement is enclosed in the inner tube 3, while in the outer tube 2, A viscous curable material B made of water, sand, a thickener such as a water-soluble resin is enclosed with the inner tube 3, but conversely, the viscous curable material B and the outer tube 2 are contained in the inner tube 3. Of course, the cement powder A may be enclosed.

  Here, in this embodiment, the water cement ratio, which is the ratio of the weight of water to the weight of the cement powder A in the anchor body fixing capsule 1, is about 0.3 to 0.5. This is because when the water cement ratio is smaller than 0.3, workability (stirability) is lowered, whereas when it exceeds 0.5, strength and durability as mortar are inferior. Then, a water cement ratio shall be 0.3-0.5.

  The aggregate cement ratio, which is the ratio of the mass of the aggregate (sand) to the mass of the cement powder A, is 1.0 to 3.0. This is because when the aggregate cement ratio is less than 1.0, the unit cement amount increases and the water cement ratio decreases, so the heat of hydration increases, drying shrinkage easily occurs, and the strength development is hindered. There is concern. On the other hand, when the aggregate cement ratio exceeds 3.0, the unit cement amount decreases, so that workability deteriorates and stirrability deteriorates, which hinders strength development. For this reason, the aggregate cement ratio is set to 1.0 to 3.0 in the present embodiment.

  Here, for the aggregate (sand), fragments of the glass tube of the crushed anchor body fixing capsule 1 are used, and the glass tube is made to have the above-mentioned aggregate cement ratio of 1.0 to 3.0. Determine the shape and thickness. If the glass tube becomes too large, a shortage of sand is sealed in advance in the outer tube 2 or the like.

  In this embodiment, as shown in FIGS. 3A to 3G, in the case of downward construction in which the anchor body fixing capsule 1 is inserted downward from above the perforation 51, the gap portion Y in the outer tube 2 is provided. And the gap X in the inner pipe 3 are both inserted into the perforation (anchor hole) 51 so as to be on the lower side. In this way, on the upper side of the outer tube 2, water that causes a hardening action by reacting with the cement powder A in the inner tube 3, and a viscous curing material B such as sand and a thickener are densely accumulated. , Because it stays in the upper part of the perforation 51, when the anchor body fixing capsule 1 is crushed, the viscous hardener B or the like is surely broken into glass fragments derived from the glass tube and cement powder A on the inner tube 3 side. This is because a mortar is formed. In this case, there is a possibility that a gap may remain at the lower end portion in the perforation (anchor hole) 51, but the tip of the anchor body 4 has an angle of 45 degrees as shown in FIGS. 2 (a) and 2 (b). This is because even if mortar is filled, it does not contribute to the yield strength so much, so even if a void remains on the lower side, there is almost no influence on the yield strength.

(4) Construction (crushing and stirring the anchor body fixing capsule 1) (FIG. 3 (f))
Next, the anchor body 4 is set on a tool such as a hammer drill, and as shown in FIG. 3F, the anchor body 4 is driven while rotating or striking (moving up and down), and the anchor 41 is anchored by the tip 41 of the anchor body 4. The outer tube 2 and the inner tube 3 of the capsule 1 for body fixation are crushed or crushed into aggregates. Then, a mortar generated by stirring and mixing the contents of the inner tube 2 and the outer tube 3 is filled in a clearance portion that is a gap between the inner peripheral surface of the perforation (anchor hole) 51 and the outer peripheral surface of the anchor body 4. 3 (f) and 3 (g), a mortar leakage suppression tool 42 such as an O-ring is mounted in advance at a predetermined position of the anchor body 4. In this embodiment, as will be described later, a tool such as a hammer drill having a rotation speed of 200 rotations / minute or more and a hitting number of about 3000 times / minute is used.

(5) Construction completed (Fig. 3 (g))
Then, as shown in FIG. 3G, when the tip 41 of the anchor body 4 reaches the bottom surface in the perforation 51, the rotation and striking of the hammer drill are stopped, and the anchor body 4 is removed from the hammer drill. Thereafter, a predetermined curing time is set, the strength of the mortar is sufficiently developed, and the anchor body 4 is fixed in the perforation 51. Thereby, the construction of the adhesive anchor using the anchor body fixing capsule 1 is completed. The drill used for drilling and the drill used for inserting the anchor body 4 may be the same or different.

≪Experiment (when crushing by rotation and blow) ≫
Next, mortar per accumulated rotation number one rotation in the case of an anchor member anchoring the capsule 1 were crushed and stirred and mixed by both rotation and striking of the anchor body 4 attached to the hammer drill and (mm 3 / ^revolution), mortar amount per shot cumulative hit number for (mm ^3/1 blow) described the results of experiments. In this experiment, sample No. The experiment was performed under the conditions of 1-19. Then, whether the anchor performance is satisfied or not is determined by, for example, tensile strength σy (unit: N / mm ² ) of anchor body 4 / nominal yield point σo of anchor body 4 (unit: N / mm ^2). )> It was performed depending on whether or not the evaluation criterion of> 1 was satisfied.

  4 shows a sample No. used in the experiment. It is a table | surface which shows the conditions of 1-19.

FIG. 1 to 19, the nominal name (size) of the anchor body 4, the nominal diameter d (unit: mm), the nominal cross-sectional area a (unit: mm ² ), the drilling diameter D (unit: mm), and the drilling depth L ( (Unit: mm), perforation cross-sectional area A (unit: mm ² ), mortar volume (mortar volume) L (Aa) (unit: mm ³ ), and clearance ratio (Dd) / d Is shown. Here, the designation M of the anchor body 4 indicates a full screw bolt 4b as shown in FIG. 2 (b), and D indicates a deformed reinforcing bar 4a as shown in FIG. 2 (a).

For example, in FIG. In the case of 1, the type of the anchor body 4 is M12, the nominal diameter d is 12.0 mm, the nominal cross-sectional area a is 84.3 mm ² , the drilling diameter D is 14.5 mm, the drilling depth L is 100.0 mm, The perforation cross-sectional area A is 165.1 mm ² , the mortar capacity (mortar volume) is 8,083 mm ^3, and the clearance ratio is 21%.

  FIG. 5 is a table showing the types of tools used in the experiment of the present embodiment, the number of rotations per minute of each tool, and the number of hits per minute.

  As shown in FIG. 5, in this embodiment, as a tool such as a hammer drill for mounting the anchor body 4, the number of rotations per minute is 200 or more and the number of hits per minute is about 3000 times. Three types were selected, and these were used for experiments.

  Specifically, as shown in FIG. 5, the tool: PR-38E (manufactured by Hitachi Koki) has a rotational speed of 400 per minute and an impact number of 3000 per minute, and the tool: DH40SA (Hitachi Machine) has a rotation number of 360 per minute and a hit number of 2800 per minute, both of which are rotating and striking tools. The tool: DH24 (manufactured by Hitachi Koki) has a rotation number of 1150 per minute and a hit number of 4600 per minute, and the rotation and striking can be selected to be linked or not linked, that is, no hitting is performed. However, in this embodiment, rotation and impact are used in conjunction with each other.

  6 shows the sample No. shown in FIG. It is a table | surface which shows the result of having experimented by the construction method of the adhesion type anchor of this embodiment using the capsule 1 for anchor body fixation on the conditions of 1-19.

Specifically, FIG. Tool, construction time (seconds), number of revolutions per minute, cumulative number of revolutions (total number of revolutions), cumulative number of revolutions 1 when experimenting with the construction method of the adhesive anchor of this embodiment under the conditions 1 to 19 mortar per rotation (mm ^3/1 rotation), it blows per minute, the cumulative hit number (total hitting number), mortar amount of accumulated hit number 1 per blow (mm ^3/1 batting), evaluation criteria described above The pass / fail result based on is shown. The construction time is the time from when the tip 41 of the anchor body 4 is applied to the anchor body fixing capsule 1 until the tool is actuated to reach the bottom of the drilling. Moreover, in the pass / fail result, the pass (◯) indicates that the tensile strength σy (unit: N / mm ² ) of the anchor body 4 / the nominal yield point σo (unit: N / mm ² ) of the anchor body 4 is greater than 1. The failure (x) is that the tensile strength σy (unit: N / mm ² ) of the anchor body 4 / the nominal yield point σo (unit: N / mm ² ) of the anchor body 4 is 1 or less.

For example, sample No. In the case of 1, the tool used is PR-38E, the construction time is 4.0 seconds, the rotational speed per minute is 400, the cumulative rotational speed (total rotational speed) is 27, and the mortar amount per cumulative rotational speed is 303 mm. ^{3 The} number of hits per minute is 3000, the cumulative number of hits (total hits) is 200, the mortar amount per hit of the cumulative hits is 40 mm ³ , and the tensile strength σy of the anchor body 4 (unit: N / mm ² ) / the nominal yield point σo (unit: N / mm ² ) of the anchor body 4 is greater than 1 and indicates a pass (◯).

Then, as shown in the pass / fail judgment column in the rightmost column of the table of FIG. In 16 samples (conditions) 1 to 14, 18, and 19, the anchor performance evaluation criteria, that is, the tensile strength σy (N / mm ² ) of the anchor body 4 / the nominal yield point σo of the anchor body 4 (N / Mm ² )> 1 and passed. Of course, the safety factor is expected, for example, a value larger than 1.3 may be accepted.

On the other hand, Sample No. The three samples (conditions) 15 to 17 do not satisfy the anchor performance evaluation criteria, that is, the tensile strength σy of the anchor body 4 (N / mm ² ) / the nominal yield point σo of the anchor body 4 (N / Mm ² ) ≦ 1, and it was rejected (x). Of course, the safety factor may be expected, for example, a value of 1.3 or less may be rejected.

  FIG. 7 is a graph showing the relationship between the value of the mortar capacity per one impact of the anchor body 4 and the pass / fail result when the anchor body fixing capsule 1 is crushed by the rotation and impact of the anchor body 4 It is.

  As described with reference to FIG. In the samples (conditions) 1 to 14, 18, and 19, the anchor performance evaluation criteria were satisfied and the sample was passed. Samples 15 to 17 (conditions) were not acceptable because they did not satisfy the evaluation criteria for anchor performance.

And with reference to FIG. 6, the sample No. which satisfied the evaluation criteria of anchor performance and passed (◯). In the samples (conditions) 1 to 14, 18, and 19, the value of the mortar capacity per cumulative impact of the anchor body 4 was 14 to 90 mm ³ .

On the other hand, the sample No. which failed (x) without satisfying the evaluation standard of anchor performance. In the samples 15 to 17 (conditions), the values of the mortar capacity per impact of the cumulative impact number of the anchor body 4 were 92, 95, and 98 mm ³ , respectively, as shown in FIG.

As a result, from the results of this experiment, when the anchor body fixing capsule 1 is crushed and mortarized by hitting and rotating the anchor body 4, the mortar capacity per hit of the anchor body 4 is calculated as follows. As shown in FIG. 7, it can be seen that the anchor performance evaluation criteria described above are satisfied when the impact is about 90 mm ³ or less per impact.

  FIG. 8 is a graph showing the relationship between the value of the mortar capacity per cumulative rotation of the anchor body 4 and the pass / fail result when the anchor body fixing capsule 1 is crushed by the rotation and impact of the anchor body 4. It is.

  As described with reference to FIG. In the samples (conditions) 1 to 14, 18, and 19, the anchor performance evaluation criteria were satisfied and the sample was passed. Samples 15 to 17 (conditions) were not acceptable because they did not satisfy the evaluation criteria for anchor performance.

Then, referring to FIG. 6, the sample No. which satisfied the evaluation standard of anchor performance and passed. In the samples (conditions) 1 to 14, 18 and 19, the capacity of the mortar per rotation of the cumulative number of rotations of the anchor body 4 was acceptable in the range of 107 to 698 mm ³ as shown in FIG.

On the other hand, the sample No. which did not satisfy the evaluation criteria of anchor performance and failed In samples 15 to 17 (conditions), the capacity of the mortar per cumulative rotation of the anchor body 4 was 719, 735, and 737 mm ³ , respectively, as shown in FIG.

As a result, from the results of this experiment, when the anchor body fixing capsule 1 is crushed and mortarized by striking and rotating the anchor body 4, the capacity of the mortar per rotation of the cumulative rotation speed of the anchor body 4 is As shown in FIG. 8, it can be seen that the evaluation criteria for the anchor performance described above are satisfied when it is about 700 mm ³ or less per rotation.

Therefore, according to the result of the experiment of crushing the anchor body fixing capsule 1 by hammering and rotation of the anchor body 4 to form a mortar, the amount of mortar per cumulative rotation is 700 mm ³ or less, and the capacity of the mortar for the striking number of anchor body 4, it can be seen that it is necessary to stir at 90 mm ³ or less per blow. This is because, when the number of rotations and the number of hits of the hammer drill per hour are extremely low, or when the mortar capacity is too large with respect to the number of cumulative rotations and the number of hits, the stirring is insufficient. As a result, the anchor-fixing capsule 1 is reliably crushed and mortared through the anchor body 4 by hammering and rotating with a hammer drill, and sufficient agitation is performed, so that construction can be easily performed even if it is not a skilled worker. Therefore, it is possible to achieve uniform anchor performance while suppressing variation in performance.

≪In case of upward construction and sideways construction≫
In addition, in the said embodiment, although the case of the downward construction which inserts the capsule 1 for anchor body fixation from the upper direction of a piercing | piercing was demonstrated, in the upward construction which attaches the anchor body 4 to a concrete ceiling, a beam, etc. from the downward direction, or this invention, Also, the present invention can be applied to a lateral construction or an upward construction in which the anchor body 4 is attached to a lateral wall or a pillar of concrete in the lateral direction or upward from below. However, in the case of sideways construction or upward construction, a thickener or the like is added to the water serving as a curing agent, and the viscosity of the liquid layer on the outer tube 2 side is set to, for example, about 10 ³ to 10 ⁵ mPa · s. When the viscosity is less than 10 ³ mPa · s, dripping of the mortar occurs, whereas when the viscosity is greater than 10 ⁵ mPa · s, before the anchor body 4 reaches the lower end of the perforation, This is because a so-called high stop or the like that cannot be inserted and a predetermined length cannot be embedded occurs. Thus, by raising the viscosity to a predetermined range, even in the construction situation such as upward construction, mortar does not hang down from the perforations during construction, and uniform anchor performance can be maintained.

Therefore, according to the construction method of the adhesive anchor using the anchor body fixing capsule of the present embodiment, the clearance ratio, that is, the clearance between the perforation 51 and the anchor body 4 with respect to the outer diameter of the anchor body 4 is experimentally determined. and 15% to 30%, the relationship between the cumulative number of revolutions and mortar amount until the anchor body 4 reaches the bottom of the perforation 51 and 700 mm ^3/1 rotation or less, and the cumulative number of strikes and mortar of the anchor body 4 of when below 90 mm ^3/1 strikes the relationship, by striking the rotating is applied, each of the contents be reliably crushed or pulverized and out glass tube is a container of the anchor member anchoring capsule not be operatives By stirring and mixing, it becomes possible to produce homogeneous mortar, and it is possible to achieve uniform anchor performance by suppressing variations in anchor performance after fixing. The

  Further, in the construction method of the adhesive anchor using the anchor body fixing capsule of the present embodiment, there is a gap on one end side of each glass tube of the outer tube 2 and the inner tube 3 of the anchor body fixing capsule 1, In the case of downward construction in which the anchor body fixing capsule 1 is inserted from above the perforation 51, the gaps of the glass tubes of the outer tube 2 and the inner tube 3 are both inserted into the perforation 51 so as to be on the lower side. Then, the contents in the glass tube of the outer tube 2 and the inner tube 3 are densely accumulated on the upper side of the anchor body fixing capsule 1, and when the anchor body fixing capsule 1 is crushed, A liquid component such as water wraps the capsule fragments and granular materials such as cement powder, and the quality of the mortar can be formed with less scattering to the outside of the perforations.

1 Anchor body fixing capsule 2 Outer tube 3 Inner tube 4 Anchor body A Cement powder B Viscous hardening material

Claims (2)

An anchor body fixing capsule in which one glass tube containing cement powder and the other glass tube containing water etc. are arranged in a double tube structure is drilled to a predetermined depth in advance. After inserting into the drilling hole, each glass tube is crushed by rotating and hitting the anchor body attached to the tool, and the contents are stirred and mixed to produce a mortar. The anchor body is filled into the mortar filled in the drilling hole. It is a construction method of an adhesive anchor using a capsule for anchoring an anchor body that is fixed by burying the end of
The clearance between the perforation and the anchor body is 15-30% of the outer diameter of the anchor body;
Relationship between the capacitance of the mortar and the cumulative rotational speed of up to the anchor body has reached the bottom of the perforations, 700 mm ^3/1 is the rotation or less, and the capacity of the mortar and the cumulative number of strikes of the anchor body relationship, is 90mm ^3/1 blow below,
A method for constructing an adhesive anchor using a capsule for anchoring an anchor body. In the construction method of the adhesive anchor using the anchor body fixing capsule according to claim 1,
There is a gap on one end of each glass tube of the anchor body fixing capsule,
In the case of downward construction in which the anchor body fixing capsule is inserted from above the perforation,
Each glass tube is inserted into the perforation so that both voids are on the lower side.
A method for constructing an adhesive anchor using a capsule for anchoring an anchor body.

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