JP2020045761A - Accretion removal device of hollow pile inner surface, and accretion removal method - Google Patents

Abstract

[Problem] To provide a device and a method for removing deposits from the inner surface of a hollow pile, which can evenly and reliably wash deposits such as sand and soil cement from the inner surface of the hollow pile over the entire inner surface of the hollow pile, and can remove the washed deposits and muddy water while reliably discharging them to the outside (above ground). [Solution] The device includes a cylindrical lifting body 1 that reciprocates within a hollow pile 5, a ring-shaped ejection pipe 2 that is attached to the lifting body 1 and has a plurality of ejection nozzles 6 that face the inner surface of the hollow pile 5, a scraper 3 whose tip edge is pressed against the inner surface of the hollow pile 5 when the lifting body 1 is raised and lowered, and a guide wheel 4 that keeps the lifting body 1 at a constant distance from the inner surface of the hollow pile 5, and when the lifting body 1 is raised and lowered within the hollow pile 5, a cleaning fluid supplied to the ejection pipe 2 is ejected from the ejection nozzles 6 onto the inner surface of the hollow pile 5, and the scraper 3 scrapes off deposits from the inner surface of the hollow pile 5. [Selected Figure] Figure 1

Description

  The present invention relates to a hollow pile (for example, a steel pipe pile or a ready-made concrete pile) in a hollow digging method or a pre-boring method, which removes deposits such as soil and soil cement on the inner surface of the hollow pile after being laid down. The present invention relates to a removing device and an attached matter removing method.

  2. Description of the Related Art Conventionally, there has been known a method of constructing, at the tip of a pile, a root-fixing bulb, which is enlarged in comparison with a pile shaft diameter, in order to increase a tip supporting force of a ready-made concrete pile or a steel pipe pile. In recent years, a high-bearing-capacity pile method has been developed in which the rate of expansion of the expanded root compacted bulb with respect to the pile shaft diameter is increased to exert a greater tip supporting force.

In general, in pile design, the greater the vertical load, the greater the acting horizontal force. Accordingly, a high bearing capacity pile is required to have high bending performance, since the acting horizontal force is larger than that of a conventional pile. In order to secure this, the use of SC piles is generally used for ready-made concrete piles. However, for steel pipe piles, it is necessary to increase the plate thickness or the pile diameter.
However, there are cases where the required bending performance cannot be ensured because there is an upper limit to the sheet thickness that can be manufactured for spiral steel pipes used in the current steel pipe pile method and the pile diameter that can be constructed is also limited. is there. In this case, countermeasures by increasing the number of piles are required, which is very uneconomical.

Therefore, a method of securing bending performance by applying a concrete-filled steel pipe pile (hereinafter referred to as CFT) structure for improving bending performance by filling concrete inside the steel pipe pile near the head of the foundation pile is adopted. Sometimes. Thereby, the bending rigidity of the pile is increased and the required bending performance can be ensured, so that economical design is possible without increasing the number of piles.
However, soil, soil cement, etc. are attached to the pile inner surface near the pile head immediately after construction. In order to form a CFT structure, it is necessary to remove these neatly and cast concrete.

  In addition, when a reinforced cage is inserted into the pile head of the sunk hollow pile, and concrete is cast to form reinforced concrete, the pile head and reinforced concrete including the reinforced cage are formed integrally. It is necessary to secure the adhesion between the two, and for that purpose, it is an essential condition that there is no attached matter such as earth and sand and soil cement on the inner surface of the pile head.

Conventionally, as an apparatus or method for removing deposits such as soil and soil cement attached to the inner surface of such a hollow pile,
(1) Insert the lower part of the washing device main body into the pile head of the hollow pile, seat it on the upper surface of the pile head with the pile head contact plate and install it. A device that ejects air to remove extraneous matter (for example, see Patent Document 1).
(2) The removal device body whose upper side is suspended by heavy equipment is made of a steel pipe that can be inserted into a steel pipe pile, and a lower jet port that can inject pressurized water into the ground inside the steel pipe pile below the removal device body. Is provided, and an air outlet capable of injecting air is provided inside the apparatus main body, and by injecting pressurized water from the lower injection port to the ground inside the steel pipe pile, while liquefying the earth and sand constituting the ground, A method in which muddy water liquefied by the water pressure and the pressure of air supplied from an air outlet is discharged to the outside of a steel pipe pile and removed (for example, see Patent Document 2).
(3) On the outer periphery of the machine frame on which the drainage pump is mounted, a device body provided with a plurality of ejection pipes arranged in a ring with a plurality of ejection ports facing outward is raised and lowered into the hollow of the hollow pile, and the ejection ports of the ejection pipes are provided. A device that injects more water (Patent Document 3) has been proposed.

JP-A-2002-115249 Japanese Patent No. 2681760 Japanese Patent No. 5245503

However, in the apparatus and method shown in the above-mentioned conventional (1), the lower part of the apparatus body is inserted into the pile head of the hollow pile, seated on the upper surface of the pile head by the pile head contact plate and installed, and the ejection of the lower part of the apparatus body is performed. Since water or air is blown out toward the inner wall surface of the pile head from the means to remove deposits, if there are several types of wall lengths in the depth direction to be removed, the required length of the lower part of the main body is There is a problem that several types of different processing (removal) devices are required, and the method is not practical. In addition, if there is no drainage function, it is difficult to discharge attached matter to the ground if the length is long, and the attached matter turns into muddy water and becomes sediment again and accumulates in the pile head. There is.

  Furthermore, if the removal range in the depth direction of the inner surface of the hollow pile is long, the length of the lower part of the main body must be increased in order to cope with it, so the processing device becomes longer and it becomes difficult to handle. There is a high possibility that the water spout will be submerged by groundwater, rainwater or washing water. In this case, there is a problem that the pressure of the spouted water is significantly attenuated in the water and the washing power is reduced.

  In addition, the conventional apparatus and method for removing earth and sand shown in the above (2) injects pressurized water from a lower injection port toward the ground at the bottom inside the steel pipe pile, liquefies the soil constituting the ground, and makes it easier to pull out the steel pipe pile. This is different from the removal of deposits on the inner surface of the steel pipe pile proposed in the present invention. However, even with this conventional apparatus, there is a possibility that adhering matter can be removed by ejecting pressurized water toward the inner surface of the pile when the removing apparatus body descends inside the steel pipe pile. However, even with such usage, the conventional apparatus and method (2) have the following problems. Since air supply is required in addition to water jetting and air is blown into the inner pipe, the apparatus becomes complicated and bulky, and the cost increases. Have the same problems and problems as the apparatus shown in FIG.

In addition, since the conventional sand removing apparatus and method shown in the above (1) and (2) removes deposits on the inner surface of the pile using only pressurized water or air pressure, the apparatus main body also has a hollow pile inner surface. Is not maintained at a constant distance (distance), the action of removing the deposits becomes uneven, and it takes time to remove the deposits attached to the inner surface of the pile. In addition, there was a problem that highly viscous deposits remained on a part of the pile inner surface, and the removal was incomplete. On the other hand, in order to completely remove the adhering matter, it is necessary to repeat the operation many times, and it takes time to remove the adhering material, and a large compressor or pump may be used. However, there was a problem that it was large and expensive.
In addition, the apparatus and method for removing deposits on the inner surface of the hollow pile described in the above (3) can be removed if the deposits on the inner surface of the hollow pile are firmly adhered, since they cannot be removed without increasing the descending and rising operations. There is a problem that the time is prolonged, the removal remains in some cases, and as a result, the workability is reduced and the use of washing water is increased.

  The present invention is to solve the conventional problems as described above, the purpose of which is without being affected by the properties of deposits such as soil and soil cement adhered to the inner surface of the hollow portion of the hollow pile. , A deposit removing device and deposits on the inner surface of the hollow pile, which can surely and quickly wash and remove the deposited deposits and muddy water to the outside (on the ground) while reliably and quickly cleaning and removing the entirety of the inner surface of the hollow pile. It is to provide a removal method.

  In order to achieve the above object, an apparatus for removing deposits on the inner surface of a hollow pile according to the present invention includes a cylindrical elevating body that is reciprocally inserted into a hollow pile submerged in the ground, and is attached to the elevating body. An annular ejection pipe having a plurality of injection nozzles at a position facing the inner surface of the hollow pile, a scraper attached to the elevating body, a tip edge of which is pressed against the inner surface of the hollow pile during elevating the elevating body, A guide attached to the elevating body, abutting the elevating body on the inner surface of the hollow pile so as to maintain a constant interval with respect to the inner surface of the hollow pile, and when the elevating body is raised and lowered in the hollow pile, The cleaning fluid supplied to the ejection pipe is sprayed from the spray nozzle to the deposit on the inner surface of the hollow pile, and the scraper is used to scrape off the deposit on the inner surface of the hollow pile, and the cleaning fluid is formed of water and air. Characterized in that it is a merging member.

With this configuration, while the lifting body is inserted into the hollow pile and lowered from the upper end opening or raised from a predetermined lowering position, the plurality of injections provided in the annular ejection pipe at the time of this lowering or ascending Air and / or water is sprayed from the nozzle toward the inner surface of the hollow pile, and the attached matter attached to the inner surface of the hollow pile is forcibly scraped off by a scraper. Can be reliably removed. Further, even if the attached matter is firmly attached to the inner surface of the hollow pile, it can be scraped off by the scraper. In these cases, the elevating body is guided by the guide so as to maintain a constant interval with respect to the inner surface of the hollow pile, so that eccentricity is prevented, and compressed air or pressurized water is applied to the entire inner circumferential surface of the hollow pile in the circumferential direction. It is sprayed at an even pressure, and the deposits on the inner surface of the pile in a predetermined range can be completely and efficiently removed. The mud generated by this removing operation is drained to the outside by a drain pump.
In addition, since the scraper works to remove deposits on the inner surface of the hollow pile, there is a cleaning effect even if the amount of water (washing water) used is small, and as a result, the generated washing mud is also reduced and within the mud pool allowance. It is possible to perform the washing work while suppressing it. In particular, when the mixed fluid of air and water is sprayed onto the inner surface of the hollow pile for cleaning, the cleaning effect is obtained even if the amount of water used is further reduced. In such a case, drainage of muddy water is not required, workability is improved, and installation of a pump is not required. Even if necessary, the pump can be reduced in size and weight, and the drainage time can be reduced.

  In the apparatus for removing deposits on the inner surface of the hollow pile, the cleaning fluid is water or air, or a mixed fluid of water and air, and in the case of only air, drainage for draining muddy water after cleaning. In addition to eliminating the need for installing a pump, the presence of a scraper reduces the amount of cleaning water even if the amount of cleaning water is reduced, so the amount of generated cleaning water (muddy water) is small and the amount of generated cleaning water (muddy water) Often falls within the pool of washing water (muddy water), in which case drainage of muddy water is not required, which is preferable. Further, the use of an expensive and large-capacity pump can be avoided.

  In the apparatus for removing deposits on the inner surface of the hollow pile, the annular ejection pipe includes an air ejection pipe and a water ejection pipe, an air supply pipe is connected to the air ejection pipe, and a water ejection pipe is connected to the water ejection pipe. When the supply pipe is connected and air can be selectively supplied to the air ejection pipe and water can be selectively supplied to the water ejection pipe, the supply of water to the water ejection pipe is stopped. Injects air only from the injection nozzle, or stops the supply of air to the air ejection pipe and injects water only from the injection nozzle of the water ejection pipe, or simultaneously injects air and water from the injection nozzle of each ejection pipe Can be selectively performed according to the properties of the attached matter adhered to the inner surface of the hollow pile, and the removal operation can be efficiently performed. In particular, the amount of water can be reduced due to the presence of the scraper, and as a result, the amount of generated mud can be kept within the range of the pool of mud, and drainage of mud is not required.

  In the apparatus for removing deposits on the inner surface of the hollow pile, the annular ejection pipe is formed of a water ejection pipe having a plurality of mixed fluid ejection nozzles of water and air, and the mixed fluid ejection nozzle is supplied with water and air. When the mixed fluid of water and air is jetted, the ability to remove extraneous matter on the inner surface of the hollow pile is increased, and the removal operation can be performed efficiently. Therefore, it is possible to remove deposits even when the amount of water used is small due to a synergistic effect with the scraper. As a result, the amount of generated mud can be suppressed within the range of the mud pool.

  Further, in the apparatus for removing deposits on the inner surface of the hollow pile, by supporting the scraper via a spring, the scraper is elastically pressed against the inner surface of the hollow pile, and can be advanced and retracted according to the inner shape of the hollow pile. Even if there are irregularities, the scraper moves back and forth, so that even if the inner surface of the hollow pile has irregularities (for example, corrugated irregularities), even if the adhered substance swells and adheres to the inner surface of the hollow pile, It is possible to respond.

  In the apparatus for removing deposits on the inner surface of the hollow pile, at least a portion of the scraper that comes into contact with the inner surface of the hollow pile, that is, the tip end portion is made of a rubber piece, thereby forcibly removing the deposits attached to the inner surface of the hollow pile. When scraping off, the inner surface of the hollow pile is elastically and softly contacted and scraped off, so that it is possible to reliably remove even the highly adherent matter without damaging the inner surface of the hollow pile.

  In the apparatus for removing deposits on the inner surface of the hollow pile, a drain pump is installed on the elevating body, and a water suction port for discharging muddy water in the hollow pile to the outside of the hollow pile is provided by a jet nozzle of the jet pipe. Since it is provided at the lower level, the water level of the muddy water generated in the cleaning operation can be drained by the drainage pump before reaching the injection nozzle. Therefore, it is possible to prevent the washing water from being jetted in the water (muddy water), the pressure of the compressed air or the pressurized water does not attenuate, and the washing ability does not decrease.

Also, in the method for removing deposits on the inner surface of the hollow pile, after placing the hollow pile in the ground, the lifting body constituting the deposit removal device is inserted into the hollow pile from the upper opening, and provided on the lifting body. By supplying the cleaning fluid to the annular ejection pipe, the injection nozzle provided on the ejection pipe ejects the cleaning fluid toward the inner surface of the hollow pile while lowering and lifting the elevating body, By pressing the leading edge of the projecting scraper against the inner surface of the hollow pile, it is possible to scrape off, wash, and remove deposits on the inner surface of the hollow pile, and lower the device body by suspending it with a heavy machine such as a crane. Alternatively, by simply lifting (lifting) the scraper, the deposits on the inner surface of the hollow pile can be scraped off while cleaning the deposits on the inner surface of the hollow pile with the cleaning fluid injected from the injection nozzle. Kill. In addition, when water is used for cleaning the deposits on the inner surface of the hollow pile, it is possible to prevent the muddy water accumulated in the hollow pile from attenuating the jetting force of water or air jetted from the jet nozzle, and drain the muddy water. The pump can be quickly discharged out of the hollow pile.
In addition, since the scraper is present, the cleaning effect can be exhibited even if the amount of water used is reduced, and hence the amount of generated mud can be kept within the mud pool allowance. Can be shortened.

According to the attached matter removing device and the attached matter removing method for the inner surface of the hollow pile of the present invention, the following effects can be obtained.
(1) Air and / or water is sprayed on the inner surface of the hollow pile, and the extraneous matter adhering to the inner surface of the hollow pile is forcibly scraped off by a scraper. Deposits such as cement can be surely and quickly washed without unevenness over the entire inner surface of the hollow pile.
(2) Even if the adhered substance is firmly adhered to the inner surface of the hollow pile, it can be reliably and quickly cleaned because it can be scraped off by a scraper.
(3) Mud water generated by washing can be discharged to the outside by a drain pump. Therefore, by discharging the generated muddy water by the drain pump before reaching the injection nozzle of the jet pipe, it is possible to avoid the injection in the muddy water (water) of the air or water, the injection power is not attenuated, and the cleaning ability is improved. It does not drop.
(4) Because of the presence of the scraper, even if the amount of water injected is small, there is a cleaning effect, the amount of generated mud can be suppressed so as to be within the pool of mud, the drainage work becomes unnecessary, and workability is improved. Is improved.

  The present invention has been briefly described above. Further, the best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

It is a partial section front view of an attached matter removal device of a hollow pile inner surface showing an embodiment of the invention. FIG. 2 is a plan view of the elevating body in FIG. 1. It is a partial cross-sectional front view (a) of the principal part of the attached matter removal device of the hollow pile inner surface which shows other embodiment of this invention, and the top view (b) of the raising / lowering body shown to (a). It is a partial cross-sectional front view of the main part of the attached matter removal device on the inner surface of the hollow pile showing still another embodiment of the present invention. It is a bottom view of the attached matter removal device of a hollow hole inner surface. It is the top view (a) and front view (b) which show the structure of a scraper. It is the top view (a) and front view (b) which show other embodiments of a scraper. It is explanatory drawing which shows the attached matter removal method of a hollow pile in process order (a) (b) (c) (d) (e) (f).

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional front view showing the entire apparatus for removing deposits on the inner surface of a hollow pile according to the present embodiment, and FIG. 2 is a plan view of the elevating body in FIG. The apparatus for removing deposits on the inner surface of a hollow pile according to the present embodiment includes an elevating body 1, an ejection pipe 2, a scraper 3, and a guide wheel 4 as a guide. Among them, the elevating body 1 has a tubular (cylindrical) shape, and is inserted into a hollow pile 5 having an inner diameter larger than the outer diameter of the elevating body 1 so as to be able to reciprocate in the depth direction of the hollow pile 5. . The elevating body 1 is made of a steel material having a predetermined thickness with high strength. As the hollow pile 5, a steel pipe pile or a ready-made concrete pile is used.

  The jet pipe 2 forms an annular shape on the outer peripheral side of the elevating body 1 and is attached to the upper outer periphery of the elevating body 1. A plurality of (for example, 28) spray nozzles 6 are radially arranged in the blow-out tube 2 such that the spray nozzles face the inner surface of the hollow pile 5 at predetermined intervals. One end of a cleaning fluid supply pipe 7 is connected to a part of the ejection pipe 2, and the other end of the supply pipe 7 is used to supply air and water as a cleaning fluid to the ejection pipe 2. The air supply pipe 8 and the water supply pipe 9 are branched and connected. Further, the air supply pipe 8 and the water supply pipe 9 function to pump up the air and the water in the water storage tank 11a by the air compressor 10 and the pump 11, respectively, and send them to the supply pipe 7.

  Each of the scrapers 3 is attached to the tip of a plurality of support members 12 projecting radially from the lower periphery of the elevating body 1. These support members 12 have substantially the same overall length. As shown in FIG. 6, the scraper 3 attached to the support member 12 is configured such that a plurality of sector plates 3a having substantially the same form are adjacent to each other. It is fixed to the lower surface of the tip of the member 12. The arc-shaped tips of the fan-shaped plates 3a are shaped and sized so as to lightly contact the inner surface of the hollow pile 5. Therefore, by arranging a plurality of fan-shaped plates 3 a adjacent to each other, the scraper 3 is connected in a circular shape at its tip end as shown in FIG. 5, so that the scraper 3 is pressed against the inner surface of the hollow pile 5. Therefore, when the elevating body 1 reciprocates in the hollow pile 5, it is possible to scrape or scrape off deposits such as soil and soil cement adhered to the inner surface of the hollow pile 5.

The guide wheel 4 is mounted on the outer periphery of the lower part of the elevating body 1, for example, at the tip of a support member 12 disposed at an angular position of 120 degrees. These guide wheels 4 rotate in contact with the inner surface of the hollow pile 5, thereby enabling the elevating body 1 to be smoothly vertically guided along the inner surface of the hollow pile 5. These guide wheels 4 function as spacers for raising and lowering the elevating body 1 with a fixed gap in the center of the hollow pile 5. Therefore, the guide wheels 4 are jetted from all the jet nozzles 6 of the jet pipe 2 to the inner surface of the hollow pile 5. The jet pressure of the cleaning fluid such as air or water can be maintained uniformly.
In the present embodiment, the guide wheel 4 is shown as a guide and rolls in contact with the inner surface of the hollow pile, but is not limited to this. Any configuration may be used as long as it is in contact with the inner surface of the hollow pile 5 to guide the elevating body 1 so as to maintain a constant interval with respect to the inner surface of the hollow pile 5. Further, in the present embodiment, the case where the guide wheel 4 as a guide is provided on the lower periphery of the elevating body 1 is shown, but this may be on the upper outer periphery of the elevating body 1 or on both the upper and lower parts. When the guide wheel 4 as a guide is present on the outer periphery of the upper part of the elevating body 1, there is also an effect of preventing the injection nozzle 6 from hitting the inner surface of the hollow pile 5 and being damaged.

  A submersible pump 13 is provided inside the elevating body 1, and the bottom of the submersible pump 13 sucks water (muddy water), which is a cleaning fluid accumulated in the hollow pile 5, and passes through a drain pipe 14. A water inlet (not shown) for discharging the pile 5 to the outside is provided. These water inlets are located sufficiently below the jet pipe 2, and the jet of the cleaning fluid from the jet nozzle 6 is not hindered under the condition that the lower part of the elevating body 1 is immersed in the muddy water in the hollow pile 5. It has become. That is, the injection of the cleaning fluid from the injection nozzle 6 in water (in muddy water) can be avoided.

  A hanging wire 15 is attached to the outer periphery of the upper end of the elevating body 1, and the hanging wire 15 is locked to an end of a wire rope 17 that is vertically moved up and down from a crane 16. Therefore, the lifting body 1 can be suspended from the crane 16 via the wire rope 17 and the suspension wire 15 to a predetermined depth area in the hollow pile 5 and inserted. When the elevating body 1 is moved up and down, the air compressor 10 and the pump 11 are operated to supply the compressed air from the air compressor 10 to the ejection pipe 2 through the air supply pipe 8 and the supply pipe 7, and the pump 11 The water in the water storage tank 11a is supplied to the ejection pipe 2 through the water supply pipe 9 and the supply pipe 7.

  Therefore, the compressed air and the high-pressure water are jetted from the jet nozzle 6 of the jet pipe 2 toward the inner surface of the hollow pile 5 via the supply pipe 7. Therefore, the deposits on the inner surface of the hollow pile 5 can be washed away. At this time, a large number of injection nozzles 6 are provided at equal intervals in the annular ejection pipe 2, so that the ejected air or water or a mixed fluid of air and water (cleaning fluid) is supplied to the inner surface of the hollow pile 5 (cleaning fluid). It is evenly sprayed on the inner peripheral surface). Then, the vertical area of the hollow pile 5 set in advance in accordance with the elevation of the elevating body 1 is sequentially washed even if there are irregularities on the inner surface in the area to remove the deposits. . The muddy water generated in the operation of removing the deposits accumulates in the area in the hollow pile 5. When the water level (level) is higher than the water suction port of the submersible pump 13 (when it rises), the submersible pump 13 The mud is discharged to the outside of the hollow pile 5 through the drain pipe 14.

On the other hand, during the elevating operation of the elevating body 1, the tip edge of the scraper 3 provided on the elevating body 1 is pressed against the inner surface of the hollow pile 5, and deposits such as soil and soil cement adhered to the inner surface of the hollow pile 5. Acts to scrape off. For this reason, even if the attached matter is sticky or the attached matter is firmly attached, it is forcibly scraped down. Therefore, the inside of the hollow pile 5 is reliably and promptly and cleanly cleaned by the step of scraping off the deposits by the scraper 3 and the step of washing off the deposits by water, air, or a mixed fluid of water and air (washing fluid). It will be.
In particular, since the scraper 3 acts to remove deposits on the inner surface of the hollow pile 5, the cleaning effect is exhibited even when the amount of water (washing water) is reduced, and as a result, the amount of generated washing mud is reduced and the mud pool is retained. The washing operation can be performed within the range of the cost.

  In these cases, the distance (gap) between the inner surface of the hollow pile 5 and the tip of the injection nozzle 6 is set to a distance that does not reduce the ability of the cleaning fluid to remove attached matter, for example, 30 mm to 200 mm. In the work for removing the deposits on the inner surface of the hollow pile 5, it is desirable that the entire inner surface of the hollow pile 5 can be washed at one time by lowering or raising the elevating body 1 once. Can be perfect. In this case, the lowering and raising of the elevating body 1 may be repeated a plurality of times.

  Further, since the guide wheel 4 is attached to the lower outer periphery of the elevating body 1, the gap between the elevating body 1 and the inner surface of the hollow pile 5 is kept constant in the above-mentioned region, and the elevating body 1 is mounted on the hollow pile. 5 can be smoothly moved along the inner surface. Therefore, the spray pressure of the cleaning fluid sprayed from the spray nozzle 6 on the inner surface of the hollow pile 5 is uniform over a wide range, and the deposits on the inner surface of the hollow pile 5 can be washed and removed without unevenness.

  3A and 3B show a device for removing extraneous matter on the inner surface of a hollow pile showing another embodiment of the present invention, wherein FIG. 3A is a partial cross-sectional front view of a main part thereof, and FIG. It is a top view of a body. This embodiment shows an example in which, instead of the one-stage ejection pipe 2 in the above-described embodiment, annular ejection pipes 2A and 2B installed in two upper and lower stages are used. Here, the supply pipe 7, the air compressor 10, the pump 11, the hanging wire 15, the crane 16, the wire rope 17, and the like shown in FIG. 1 are omitted, but have the same configuration. The upper and lower annular ejection pipes are composed of an air ejection pipe 2A and a water ejection pipe 2B, and each of the ejection pipes 2A and 2B is provided with an ejection nozzle 6 toward the inner surface of the hollow pile 5. An air supply pipe 21 is connected to the air ejection pipe 2A, a water supply pipe 22 is connected to the water ejection pipe 2B, air is supplied to the air ejection pipe 2A, and air can be ejected from the ejection nozzle 6. In addition, water is supplied to the water ejection pipe 2B, and water can be ejected from the ejection nozzle 6. The supply of air from the air supply pipe 21 to the air ejection pipe 2A and the supply of water from the water supply pipe 22 to the water ejection pipe 2B can be selectively supplied. Reinforcement frames 24 and 25, each of which is a cross-shaped plate material as shown in FIGS. 3 and 4, are attached to the inner surfaces of the upper and lower ends of the elevating body 1, respectively. Other configurations are the same as those of the above-described embodiment, and the same components are denoted by the same reference numerals.

  In the apparatus for removing deposits on the inner surface of the hollow pile having such a configuration, the supply of water to the water ejection pipe 2B is stopped, air is supplied to the air ejection pipe 2A, and air is injected only from the injection nozzle 6 of the air ejection pipe 2A. Cleaning, or stopping supply of air to the air ejection pipe 2A, supplying water to the water ejection pipe 2B, and jetting water only from the ejection nozzle 6 of the water ejection pipe 2B for washing. To selectively supply air and water to the ejection pipes 2A and 2B of the respective nozzles, and simultaneously jet air and water from the ejection nozzles 6 and 6 of the ejection pipes 2A and 2B to perform cleaning. Becomes possible. As a result, the cleaning operation can be performed selectively according to the property of the attached matter attached to the inner surface of the hollow pile 5, and the attached matter removing operation can be efficiently performed. In particular, since the scraper 3 is present, it is possible to further increase the efficiency of the removing operation by selecting the optimum removing efficiency in consideration of its operation and effect. In this case, when only air is ejected from the ejection nozzle 6 of the ejection pipe 2A, there is no need to install the submersible pump on the elevating body 1, and even if it is installed, it is not necessary to operate the submersible pump. In addition, since the scraper 3 acts to remove deposits on the inner surface of the hollow pile 5, the amount of water used can be reduced, and the amount of washing water that accumulates in the hollow pile 5 per unit time can be reduced. Since it can be kept within the range of the cost, drainage is not required, and installation of the pump is not required. Even if necessary, the pump can be reduced in size and weight, and the drainage time can be reduced.

  FIG. 4 is a partial cross-sectional front view of a main part of a device for removing deposits on the inner surface of a hollow pile showing still another embodiment of the present invention. In this embodiment, a jet pipe 2b having a plurality of mixed fluid jet nozzles 6a for jetting a mixed fluid of water and air is provided. Water and air are supplied to the mixed fluid jet nozzle 6a, and mixing of water and air is performed. The feature is that the fluid is ejected.

  In FIG. 4, an annular jet pipe provided on the outer periphery of the elevating body 1 is constituted by a water jet pipe 2b having a plurality of mixed fluid jet nozzles 6a for jetting a mixed fluid of water and air. An annular air passage pipe 2a is provided in parallel, a water supply pipe 22 is connected to the water ejection pipe 2b, an air supply pipe 21 is connected to the air passage pipe 2a, and each mixed fluid of the water ejection pipe 2b is provided. A connection pipe 2c is connected to the injection nozzle 6a between the injection nozzle 6a and the air passage pipe 2a. Therefore, the water supplied from the water supply pipe 22 to the water ejection pipe 2b can be ejected from the mixed fluid ejection nozzle 6a, and at the same time, the air supplied from the air supply pipe 21 to the air passage pipe 2a also passes through the connection pipe 2c. The mixed fluid ejection nozzle 6a can eject, and the mixed fluid of water and air can be ejected from the mixed fluid ejection nozzle 6a. As a result, the jet force of air is added to the jet force of water, and the jet force of the mixed fluid is increased.

As in this configuration, a water jet pipe 2b having a plurality of mixed fluid jet nozzles 6a for jetting a mixed fluid of water and air is provided. Water and air are supplied to the mixed fluid jet nozzle 6a, and the water and air are mixed. When the mixed fluid is jetted, the jetting power of air is added to the jetting power of water, and the jetting power of mixed fluid is increased. 5 The ability to remove extraneous matter on the inner surface is increased, and the removal operation can be performed efficiently. In addition, due to the synergistic effect with the scraper 3, the water can be removed even if the used amount of the washing water is small. As a result, the amount of generated mud can be suppressed within the range of the mud pool.
Further, according to the apparatus for removing deposits on the inner surface of the hollow pile of the embodiment shown in FIG. 4, the supply of air from the air supply pipe 21 to the air passage pipe 2a is stopped in addition to the above, and the water supply pipe 22 By supplying water to the water ejection pipe 2b from the nozzle, only the water can be ejected from the mixed fluid ejection nozzle 6a, or the supply of water from the water supply pipe 22 to the water ejection pipe 2b is stopped. By supplying air from the air supply pipe 21 to the air passage pipe 2a, only the air can be injected from the mixed fluid injection nozzle 6a. Therefore, in the apparatus for removing deposits on the inner surface of the hollow pile of this embodiment, cleaning is performed by injecting a mixed fluid of water and air from the mixed fluid injection nozzle 6a, or by injecting only water from the mixed fluid injection nozzle 6a. It is also possible to selectively perform the cleaning operation in which only the air is injected from the mixed fluid injection nozzle 6a. Thereby, a cleaning operation can be performed by selecting an optimum cleaning method according to the property of the attached matter attached to the inner surface of the hollow pile 5, and the attached matter removing operation can be efficiently performed. In addition, since the scraper 3 is present, the efficiency of the removal operation can be further improved by selecting the optimum removal efficiency in consideration of its operation and effect.

  As shown in FIG. 5, the scraper 3 is attached to the tips of the plurality of support members 12 so that the plurality of sector plates 3a are adjacent to each other. As shown in FIGS. 6 (a) and 6 (b), these fan-shaped plates 3a are each provided with a rubber piece 26 having a distal end in the form of a knife edge attached to the distal end (outer peripheral portion). The support member 12 is axially slidably fitted via a spring member (not shown) to the other base member 12a to which one cylindrical movable member 12b is fixed to the elevating body 1. Therefore, when the elevating body 1 moves up and down in the hollow pile 5, the tip edge of the scraper 3 on the inner surface of the hollow pile 5, that is, the tip of the rubber piece 26 abuts on the inner surface and imitates the inner surface. ), And the pressing force of the scraper 3 against the inner surface of the hollow pile 5 is moderately absorbed even if the inner surface of the hollow pile has an uneven surface. Therefore, the inner surface of the hollow pile 5 is not damaged by frictional contact with the scraper 3. When the inner surface of the hollow pile 5 is smooth, a scraper 3 as shown in FIGS. 7A and 7B which is entirely made of a hard material such as a metal material or a synthetic resin material can be used. In this case, it is desirable to provide a large cutout or hole 27 at the center so that the metal material or the synthetic resin material has elasticity.

  As described above, air can be selectively ejected from the ejection nozzle 6 of the ejection pipe 2A, and water can be ejected from the ejection nozzle 6 of the ejection pipe 2B. In addition, it is possible to selectively perform jetting of a mixed fluid of water and air, jetting only water, or jetting only air from the mixed fluid jet nozzle 6a of the water jet pipe 2b. By raising and lowering the elevating body 1 in the hollow pile 5 in the air or water jetting state, the inner surface of the hollow pile 5 is formed by both the action of scraping off the deposits by the scraper 3 and the cleaning by air or water as described above. Can be cleaned cleanly. In the case of washing with water, washing water (muddy water) after washing is accumulated in the hollow pile 5, and this muddy water can be quickly discharged out of the hollow pile 5 by operating the submersible pump 13. . In addition, since the scraper 3 acts to remove extraneous matter from the inner surface of the hollow pile 5, the cleaning effect can be exerted even if the amount of injected water is reduced, and the amount of generated muddy water is kept within the mud pool allowance for drainage work. May be unnecessary.

Next, a case where the above-mentioned attached matter removing method is carried out by a middle boring method will be described with reference to FIG. FIG. 8 is an explanatory view showing a method for removing the deposits on the inner surface of the hollow pile in the order of steps (a), (b), (c), (d), (e), and (f).
First, FIG. 8A shows a state in which an enlarged root compaction part K is built at the tip of the hollow pile 5. The construction of the foundation portion K is performed by a conventionally known method. In the construction of the root compaction part K, the root compaction liquid R (or soil cement) rises in the hollow pile 5 as shown in FIG. I do. Therefore, as shown in FIG. 8B, the bucket 31 is lifted and lowered into the hollow pile 5 with the wire 32, and the root compaction liquid (or soil cement) R is pumped out of the hollow pile 5. In this pumping operation, not only the section of the necessary washing area T but also the section of the muddy water allowance S is added and pumped. This pumping can also be performed using a mud pump. As a result, when the consolidation liquid R reaches a predetermined level L that requires cleaning (the cleaning section T + the muddy water reserve S), the pumping operation is terminated (FIG. 8C). Next, the elevating body 1 is inserted into the hollow pile 5 by the method described above, and while the elevating body 1 is lowered or raised, the compressed air from the air compressor 10 or the high-pressure water from the pump 11 or a mixed fluid thereof is discharged. It is supplied to the ejection pipe 2 or each of the ejection pipes 2A, 2B, 2a, 2b, and is ejected from the respective ejection nozzles 6, 6a to clean the inner surface of the hollow pile 5. At the same time, the lowering or raising of the elevating body 1 causes the scraper 3 attached to the outer peripheral side of the elevating body 1 to act to scrape off the extraneous matter on the inner surface of the hollow pile 5, so that the extraneous matter such as earth and sand or soil cement is removed. It is washed down in the hollow pile 5 while being turned into muddy water with the air and the washing water.

Next, when the washing water (muddy water) accumulated on the upper part of the consolidation liquid R at the level L in the hollow pile 5 by the washing operation of the deposits exceeds the muddy water allowance S, it is raised and lowered. It is sucked by the submersible pump 13 in the body 1 and discharged out of the hollow pile 5. When the washing water (mud water) falls within the range of the mud pool amount S, drainage work is not necessary (FIGS. 8D and 8E). Then, after washing the area (washing section) T requiring washing, the lifting body 1 is pulled out of the hollow pile 5, and the washing operation is completed (FIG. 8E). Then, after the muddy water remaining at the level L or higher is pumped out by a bucket or discharged out of the hollow pile 5 by suction by a pump, an image is taken to confirm the state inside the hollow pile 5 after the discharge is completed. The condition inside the hollow pile 5 may be confirmed visually. After confirming that there is no extraneous matter on the inner surface of the hollow pile 5 by this photographing or visual observation, a series of extraneous matter removing operations is completed (FIG. 8 (f)).
FIG. 8F shows a case where the muddy water in the portion of the muddy water allowance is also drained. However, as shown in FIG. 8E, the muddy water within the muddy water allowance S is left as it is. You may.

  As described above, the apparatus for removing deposits on the inner surface of a hollow pile 5 such as a steel pipe pile or a ready-made concrete pile according to the present embodiment places the hollow pile 5 in the ground and then moves the elevating body 1 from the upper opening to the hollow pile. 5, the cleaning fluid is supplied to the annular ejection pipes 2, 2A, 2B, 2a, 2b provided on the lifting / lowering body 1 to thereby provide the ejections provided on the ejection pipes 2, 2A, 2B, 2b. While the cleaning fluid is sprayed toward the inner surface of the hollow pile 5 from the nozzles 6 and 6a, the elevating body 1 is lowered and raised, and the tip edge of the scraper 3 protruding from the elevating body 1 is pressed against the inner surface of the hollow pile 5. In this way, it is possible to wash and remove deposits on the inner surface of the hollow pile 5. This makes it possible to surely and uniformly wash the soil, soil, soil cement, and other deposits adhered to the inner surface of the hollow pile 5 over the entire inner surface of the hollow pile 5, and to reliably remove the washed deposits and mud to the outside (ground). It can be removed while discharging to When the amount of washing water (mud water) is small and falls within the range of the mud pool amount S, drainage becomes unnecessary.

The apparatus and method for removing deposits on the inner surface of a hollow pile according to the present invention can surely and uniformly remove deposits such as soil and soil cement adhered to the inner surface of a hollow pile 5 over the entire inner surface of the hollow portion 5. At the same time, it has the effect of reliably removing the washed deposits and muddy water to the outside (ground) while removing the deposits such as soil and soil cement from the inner surface of the hollow pile after being settled. It is useful for an attached matter removing device, an attached matter removing method, and the like.

DESCRIPTION OF SYMBOLS 1 Elevating body 2, 2A, 2B, 2b Jet pipe 2a Air passage pipe 2c Connecting pipe 3 Scraper 3a Fan plate 4 Guide wheel 5 Hollow pile 6 Injection nozzle 6a Mixed fluid injection nozzle 7 Supply pipe 8 Air supply pipe 9 Water supply pipe 10 Air compressor 11 Pump 12 Support member 12a Base member 12b Movable member 13 Submersible pump 14 Drain pipe 15 Hanging wire 16 Crane 17 Wire rope 21 Air pipe 22 Water pipe 23 Air / water pipe 24, 25 Reinforcement frame 26 Rubber piece 31 Bucket 32 Wire K Expanded Root Consolidation R Root Consolidation Liquid S Mud Pool

Claims (5)

A cylindrical elevating body inserted reciprocally into a hollow pile submerged in the ground,
An annular ejection pipe attached to the elevating body and having a plurality of ejection nozzles at a position facing the inner surface of the hollow pile,
A scraper attached to the elevating body, a tip edge of which is pressed against the inner surface of the hollow pile during elevating the elevating body,
A guide attached to the elevating body, abutting the elevating body on the inner surface of the hollow pile so as to maintain a constant interval with respect to the inner surface of the hollow pile,
At the time of elevating the elevating body in the hollow pile, the cleaning fluid supplied to the ejection pipe is jetted from the jet nozzle to the inner surface of the hollow pile, and the scraper scrapes off the attached matter on the inner surface of the hollow pile,
The apparatus for removing deposits on the inner surface of a hollow pile, wherein the cleaning fluid is a mixed fluid of water and air.   The deposit on the inner surface of the hollow pile according to claim 1, wherein the scraper is supported via a spring, and is elastically pressed against the inner surface of the hollow pile so as to advance and retreat according to the inner surface shape of the hollow pile. Removal device.   3. The apparatus for removing deposits on the inner surface of a hollow pile according to claim 1, wherein at least a tip edge portion of the sprayer that comes into contact with the inner surface of the hollow pile is a rubber piece. 4. A drain pump is installed on the elevating body, and a water suction port for sucking muddy water in the hollow pile and discharging it out of the hollow pile is provided at a lower level than the jet nozzle of the jet pipe. The apparatus for removing deposits on the inner surface of a hollow pile according to any one of claims 1 to 3. A method for removing deposits on the inner surface of a hollow pile using the apparatus for removing deposits on an inner surface of a hollow pile according to any one of claims 1 to 4,
After sinking the hollow pile on the ground, the lifting body constituting the deposit removal device is inserted into the hollow pile from the upper opening, and the cleaning fluid is supplied to the annular ejection pipe provided on the lifting body, While raising and lowering the elevating body while injecting a cleaning fluid toward the inner surface of the hollow pile from an injection nozzle provided in the ejection pipe, the leading edge of the scraper protruding from the elevating body is moved to the inner surface of the hollow pile. A method for removing deposits on the inner surface of a hollow pile by pressing against the inner surface of the hollow pile to remove and remove the deposits on the inner surface of the hollow pile.

Images