JP2009263860A - Equipment for removing extraneous matter on inner surface of hollow pile, and method for removing extraneous matter on inner surface of hollow pile by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment and a method for removing extraneous matter on an inner surface of a hollow pile, which enable the extraneous matter such as sediment and soil cement, adhering to the inner surface of the hollow portion of the hollow pile (e.g. a steel pipe pile and a prefabricated concrete pile), to be easily and surely flushed and removed in the simple equipment, which enable a removal operation to be performed while the removed extraneous matter and slurry are surely discharged to the outside, and which prevent the submersion of a water jet orifice under water and a deterioration in the flushing capacity of the water jet orifice. <P>SOLUTION: An equipment body, in which an exhaust pipe with the jet orifices arranged at predetermined spacings is annularly provided on the outer periphery of a machine casing equipped with a drainage pump, can be inserted into the hollow portion of the hollow pile. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus and a removal method for removing deposits such as earth and sand and soil cement on the inner surface of a hollow pile after laying in a hollow pile (for example, steel pipe pile, ready-made concrete pile) or a pre-boring method.

  Conventionally, in order to increase the tip bearing capacity of ready-made concrete piles and steel pipe piles, there is known a method of building a root consolidation bulb expanded as compared to the pile shaft diameter, a so-called expansion root consolidation bulb at the pile tip. In recent years, a high bearing capacity pile construction method has been developed in which the enlargement ratio of the enlarged root bulb with respect to the pile shaft diameter is increased and a greater tip bearing capacity is exhibited.

In general, in pile design, the higher the vertical load, the greater the applied horizontal force. Therefore, high bearing capacity piles are required to have high bending performance because the acting horizontal force is larger than that of conventional piles. In order to ensure this, SC piles are generally used in ready-made concrete piles, but in steel pipe piles, this can be dealt with by increasing the plate thickness or increasing the pile diameter.
However, because there is an upper limit to the plate thickness that can be produced for spiral steel pipes used in the current steel pipe pile construction method, and because there are restrictions on the diameter of piles that can be constructed, the required bending performance may not be ensured. is there. In this case, it is necessary to take measures by increasing the number of piles, which is very uneconomical.

Therefore, a concrete-filled steel pipe pile (hereinafter referred to as CFT) structure that fills the steel pipe pile with concrete to improve bending performance is applied to the vicinity of the foundation pile head to ensure bending performance. May be. Thereby, since the bending rigidity of a pile becomes large and the required bending performance can be ensured, economic design is possible without increasing the number of piles.
However, earth and sand, soil cement, etc. are attached to the inner surface of the pile near the pile head immediately after construction. In order to obtain a CFT structure, it is necessary to cleanly remove them and to cast concrete.

  In addition, in order to integrally form the pile head and the reinforced concrete including the reinforced cage when the reinforced cage is inserted into the pile head of the hollow pile that has been sunk and the concrete is further cast into reinforced concrete. Therefore, it is necessary to ensure adhesion between the two, and for that purpose, there is no deposit such as earth and sand or soil cement on the inner surface of the pile head.

Conventionally, as an apparatus and method for removing deposits such as earth and sand and soil cement attached to the inner surface of such a hollow pile,
(1) Insert the lower part of the main body of the cleaning device into the pile head of the hollow pile, place it on the top of the pile head with the pile head contact plate, and install water or water from the jetting means at the bottom of the main body toward the inner wall of the pile head. One that ejects air to remove deposits (see, for example, Patent Document 1).
(2) The removal device main body suspended on the heavy machine on the upper side is made of a steel pipe that can be inserted into the steel pipe pile, and a lower injection port capable of injecting pressurized water to the ground inside the steel pipe pile is provided below the removal device main body. An air outlet is provided in the main body of the apparatus, and air can be injected into the apparatus main body, and by injecting pressurized water from the lower injection port onto the ground inside the steel pipe pile, the earth and sand constituting the ground are liquefied and water pressure is increased. In addition, a method has been proposed in which muddy water liquefied by air pressure supplied from an air outlet is discharged to the outside of a steel pipe pile and removed (for example, see Patent Document 2).
JP 2002-115249 A Japanese Patent No. 2681760

However, in the conventional apparatus and method shown in (1), the lower part of the main body of the apparatus is inserted into the pile head of the hollow pile, and the pile head contact plate is seated on the upper surface of the pile head. Since the deposits are removed by ejecting water or air from the means toward the inner wall surface of the pile head, if there are several types of wall length 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 kinds of different processing (removal) apparatuses are required, which is not practical.
In addition, when there is no drainage function, if the length is long, it will be difficult to discharge the deposits to the ground. After the deposits become muddy, they will become sediment again and accumulate in the pile head. There is.
Furthermore, if the removal range in the depth direction of the inner wall surface of the hollow pile is long, the length of the lower part of the main body has to be increased in order to cope with it, so that the processing device becomes longer and difficult to handle, and the ejection means of the lower main body There is a high possibility that the water outlet is submerged due to groundwater, rainwater, or washing water. In this case, there is a problem that the water pressure to be ejected is significantly attenuated in the water and the cleaning power is reduced.

In addition, the conventional sand removal apparatus and method shown in (2) above is such that pressurized water is sprayed from the lower injection port toward the bottom of the steel pipe pile, the soil constituting the ground is liquefied, and the steel pipe pile is easily pulled out. This is different from the removal of deposits on the inner surface of the steel pipe pile proposed in the present invention.
However, even in this conventional apparatus, when the removing apparatus main body descends in the steel pipe pile, there is a possibility that the deposits can be removed by ejecting pressurized water toward the inner surface of the pile. However, even if it is used in this way, the conventional apparatus (2) and method have the following problems.
Since air supply is required in addition to water ejection, and the air is blown into the inner pipe, the problem is that the apparatus is complicated and large, and the cost is high. There are problems and issues similar to those shown in the apparatus.

  The present invention has been proposed to solve such a conventional problem. The purpose of the present invention is to remove earth and sand adhering to the inner surface of the hollow portion of a hollow pile (for example, a steel pipe pile or a ready-made concrete pile) in a simple device. Soil cement and other deposits can be easily and reliably washed and removed, and the removed deposits and muddy water can be removed while reliably discharging to the outside (ground), and the water injection port (spout) is submerged. The object of the present invention is to provide a deposit removing device and a deposit removing method on the inner surface of a hollow pile that are free from the deterioration of the cleaning ability.

  In order to achieve the above object, the deposit removing device for the inner surface of a hollow pile according to the present invention is a device in which a plurality of spray pipes are provided on the outer periphery of a machine frame on which a drainage pump is mounted with a plurality of spray ports arranged outward. The main body can be inserted into the hollow of the hollow pile, and the jet pipe is connected to an external water supply pump via a water supply hose.

  With this configuration, the device main body can be inserted into the hollow of the hollow pile and lowered from the upper end or raised from the lowered position. Can be removed and the deposits on the inner surface of the hollow pile can be removed. At this time, the ejection pipe is provided in an annular shape on the outer periphery of the machine frame, and a plurality of injection ports are arranged outward on the ejection pipe. Since it is injected annularly on the peripheral surface, the deposit on the inner surface of the pile in a predetermined range of the hollow pile can be completely removed by lowering or raising the apparatus main body within the range to be removed. Moreover, since the muddy water generated by this removal work can be worked while being drained to the outside by the drainage pump, the main body of the apparatus is not submerged, and the removed deposits can be reliably discharged to the outside together with the muddy water.

  Moreover, when the injection port of the deposit removing device on the inner surface of the hollow pile is provided at a position higher than the position of the water suction port of the drainage pump, the level of muddy water generated in the removal operation is not reached before reaching the injection port. Since the water can be drained by the drainage pump, the injection port can be always exposed without being submerged. Therefore, the pressure attenuation of the injected pressurized water is overwhelmingly small compared with the underwater injection, and the cleaning ability is not lowered. In addition, the angle of the jet water from the jet outlet to the inner surface of the hollow pile is horizontal or the angle of the depression angle is 45 °. When the distance is longer than the distance, the force acts in the direction of dropping the removed deposit simultaneously with the removal of the deposit, which is effective.

Also, for example, but not limited to this, if the machine frame of the deposit removing device on the inner surface of the hollow pile is cylindrical, a drainage pump is mounted inside the cylindrical machine frame, The structure which enables an apparatus main body to be inserted in the hollow of a hollow pile can be easily comprised by providing a jet pipe in an outer periphery cyclically | annularly and providing a jet nozzle in this jet pipe.
In addition, it is preferable that the machine frame of the apparatus for removing deposits on the inner surface of the hollow pile is provided with a suspension means because the apparatus main body can be suspended by a heavy machine and the inside of the hollow pile can be lowered or raised.

Furthermore, the deposit removing device on the inner surface of the hollow pile is characterized in that a spacer is provided in the machine frame for keeping the distance between the injection port and the inner surface of the hollow pile constant.
If the distance between the injection port and the inner surface of the hollow pile is increased, the detergency of the injected water will decrease. Conversely, if the distance between the injection port and the inner surface of the hollow pile is too small, the range of contact with the inner wall surface of the injection water becomes narrow due to the relationship between the injection angle and the distance. Deposits such as earth and sand and soil cement cannot be removed where the water is not directly exposed. It is preferable to provide a spacer because the distance between the injection port and the inner surface of the hollow pile can always be maintained at an appropriate distance.
Incidentally, the distance between the injection port and the inner surface of the hollow pile is preferably about 30 mm to 200 mm, and most preferably about 100 mm.

Moreover, the deposit removal method of the hollow pile inner surface of this invention is a deposit removal method of a hollow pile inner surface using the deposit removal apparatus of the hollow pile inner surface in any one of Claims 1 thru | or 3,
After placing the hollow pile in the ground, suspend the device body and insert it into the hollow pile from the upper opening, supplying water to the discharge pipe by the water supply pump and spraying it from the injection port toward the inner surface of the hollow pile, The apparatus main body is lowered or raised from the lowered position to clean and remove the deposits on the inner surface of the hollow pile, and the generated muddy water in the hollow pile is drained by a drainage pump.

  With this configuration, the device body is suspended by a heavy machine such as a crane and inserted into the hollow pile, and the deposit on the inner surface of the hollow pile is removed by the water sprayed from the injection port by simply moving it down or up (lifting). It can be washed away. The muddy water generated at this time can be removed while draining with a drain pump. Therefore, since the position of the injection port is not always submerged in the muddy water, it is possible to easily remove the deposits on the inner surface of the hollow pile.

Furthermore, in the method for removing deposits on the inner surface of the hollow pile of the present invention, the apparatus main body suspended in the hollow pile is supplied with water by a water supply pump and injected from the injection port toward the inner surface of the hollow pile, The step of sequentially descending in the depth direction, or the step of sequentially descending in the depth direction from the upper part of the hollow pile and the step of sequentially raising in the upward direction from the lowered position are repeated a plurality of times.
Thereby, it can wash | clean and remove more completely, without the deposit | attachment of a hollow pile inner surface remaining.

According to the deposit removing device and the deposit removing method on the inner surface of the hollow pile of the present invention, the following effects can be obtained.
(1) The apparatus body of the present invention can be inserted into the hollow of the hollow pile and lowered from the upper end or raised from the lowered position. By supplying pressurized water to the pipe and ejecting it from the injection port toward the inner surface of the hollow pile, the deposits on the inner surface of the hollow pile can be removed. At this time, the ejection pipe is provided in an annular shape on the outer periphery of the machine frame, and the ejection ports are arranged at predetermined intervals in the ejection pipe, so that the supplied pressurized water is supplied to the entire inner circumferential surface of the hollow pile in the circumferential direction. Therefore, the deposit on the inner surface of the pile in a predetermined range of the hollow pile can be completely removed by lowering or raising the apparatus main body within the range to be removed. Moreover, since the muddy water generated by this removal work can be worked while being drained to the outside by the drainage pump, the main body of the apparatus is not submerged, and the removed deposits can be reliably discharged to the outside together with the muddy water.

(2) At this time, muddy water-like deposits such as earth and sand can be discharged to a pit or the like through a drainage hose with a drainage pump, so that the work site is not contaminated and the work environment is improved. Therefore, the environment is not polluted.
Moreover, the drained muddy water can be reused as washing water by using a sedimentation tank.

  (3) Since the injection port of the deposit removing device on the inner surface of the hollow pile is provided at a position higher than the position of the water suction port of the drainage pump, before the level of muddy water generated in the removal operation reaches the injection port Since the water can be drained by the drain pump, the injection port is always exposed without being submerged. Therefore, the pressure of the supplied pressurized water is not attenuated, and the cleaning ability is not reduced.

  (4) Since the apparatus for removing deposits on the inner surface of the hollow pile according to the present invention is provided with a spacer for keeping the distance between the injection port and the inner surface of the hollow pile constant in the machine frame, the main body of the device is mounted on the inner surface of the hollow pile. When inserted, the distance between the injection port and the inner surface of the hollow pile can always be kept at an appropriate distance, and the washing and removing ability can always be maintained optimally.

(5) Since cleaning and drainage can be performed in one step, the cleaning time can be shortened.
(6) If the pile inner diameter is the same, it can be cleaned with one type of cleaning device regardless of the cleaning range.
Moreover, if the distance from a jet nozzle to a pile inner surface is between 30-200 mm, it is possible to respond | correspond to several pile internal diameter with the same apparatus.
(7) The supply pumps and drainage pumps of materials and equipment to be used can use general-purpose products such as grout pumps and submersible pumps, and the configuration is simple, so the manufacturing cost of the apparatus is low.
(8) Since the cleaning device is compact, it is easy to use.

  (9) According to the method for removing deposits from the inner surface of the hollow pile according to the present invention, the main body of the apparatus is suspended from a heavy machine such as a crane, inserted into the hollow pile, and water is supplied by a water supply pump and injected from an injection port. On the other hand, the deposit cleaning and removing work on the inner surface of the hollow pile can be easily performed only by the operation of raising the apparatus main body from the lowered or lowered position. Moreover, since the muddy water generated in the drainage pump can be drained to the outside during this work, the deposit removal work on the inner surface of the hollow pile becomes easy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view illustrating a deposit removing device for an inner surface of a hollow pile according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating the deposit removing device for an inner surface of a hollow pile according to an embodiment of the present invention. is there.

  The apparatus for removing deposits on the inner surface of the hollow pile includes an apparatus main body 1 in which an ejection pipe 4 is disposed on the outer periphery of a machine frame 2 on which a drainage pump 3 is mounted. For example, the steel pipe pile or the ready-made concrete pile) 14 can be inserted into the hollow of the pipe 14 and can be moved back and forth (down and up). The jet pipe 4 is connected to an external water supply pump 6 via a water supply hose 7. It has become. The water supply pump 6 is connected to a water storage tank 8 so that pressurized water can be supplied to the ejection pipe 4. The machine frame 2 is provided with a suspending means 10 that can be suspended by a heavy machine 11 such as a crane.

  Therefore, the apparatus main body 1 can be suspended from a heavy machine 11 such as a crane and inserted into the hollow of the hollow pile 14, and can be lowered from the upper end or raised from the lowered position. Pressurized water is supplied to the ejection pipe 4 by the pump 6 and can be ejected from the ejection port 5 toward the inner surface of the hollow pile 14, whereby the deposits on the inner surface of the hollow pile 14 can be removed. At this time, the ejection pipe 4 is provided in an annular shape on the outer periphery of the machine casing 2, and the ejection ports 5 are arranged at predetermined intervals in the ejection pipe 4, so that the supplied pressurized water is supplied in the circumferential direction of the hollow pile 14. Since it is injected to the entire inner peripheral surface, the deposits on the inner surface of the pile 14 in a predetermined range of the hollow pile 14 are completely removed by lowering the device body 1 from the lowered or raised position within the range to be removed in the length direction. be able to. Further, the muddy water 12 generated in this removal work can be worked while being drained to the outside by the drainage pump 3 through the drainage hose 9 when the water level is higher than the position of the water inlet 3a. As the drainage pump 3, a submersible pump is preferable.

  The machine casing 2 is cylindrical in this embodiment, and the inner cylinder 2a and the outer cylinder 2b are arranged concentrically, and the inner cylinder 2a and the outer cylinder 2b are connected by a connecting member 2c. The drainage pump 3 is mounted so as to be located in the inner cylinder 2a. The outer diameter of the cylindrical machine frame 2 is configured to be smaller than the inner diameter of a hollow hollow pile (for example, steel pipe pile, ready-made concrete pile) 14, and a jet pipe 4 having an injection port 5 disposed on the outer periphery of the machine frame 2. Even if it is provided in an annular shape, the outer diameter of the hollow pile 14 is such that a predetermined interval can be maintained between the injection port 5 and the inner surface of the hollow pile 14. Thereby, the apparatus main body 1 can be inserted into the hollow hollow pile 14 that has been laid and moved forward and backward (lowered and raised).

  When the distance between the jet port 5 and the inner surface of the hollow pile 14 is increased, the momentum of the spray water hitting the inner surface of the hollow pile 14 decreases, the cleaning power decreases, and conversely, the jet port. If the distance between 5 and the inner surface of the hollow pile 14 is too small, the range where the spray water hits becomes narrow due to the relationship between the spray angle (spreading angle when water spreads radially from the spray port) and the distance, There is a possibility that a removal residue will occur. Accordingly, the distance (interval) between the injection port 5 and the inner surface of the hollow pile 14 is preferably about 30 mm to 200 mm, and most preferably about 100 mm. The number of injection ports is determined by the injection angle, the distance from the inside of the hollow pile 14, the pump capacity, and the like. The angle of the jet water from the injection port to the inner surface of the hollow pile is 45 ° (Depression angle), the injection angle is 40 °, the distance between the injection port 5 and the inner surface of the pile 14 is 100 to 200 mm, and 10 to 20 pumps are 400 liters / minute. preferable.

  It is preferable that the removal work by the deposit removing device on the inner surface of the hollow pile can clean the entire circumference of the inner surface of the pile 13 by one descent operation or ascending operation of the apparatus body 1 at one time. When it cannot be completely removed, the operation of lowering and raising the apparatus main body 1 may be repeated and washing may be performed several times. By properly setting the interval between the injection port 5 and the inner surface of the hollow pile 14 and the number of attachments of the injection port 5 with respect to the outer diameter of the ejection pipe 4, the entire inner surface of the pile 14 can be cleaned at a time, and the number of repetitions can be reduced and cleaned. Time can be shortened and work efficiency can be improved.

  3 and 4 are a perspective view and a cross-sectional view showing a deposit removing device for an inner surface of a hollow pile according to another embodiment of the present invention. In this embodiment, the jet pipe 4 and the jet port 5 arranged in the jet pipe 4 are provided in a position (above) higher than the position of the water suction port 3a of the drainage pump 3 and the machine frame 2. Since it is provided with a configuration in which a spacer 13 is provided for keeping the distance between the injection port 5 and the inner surface of the hollow pile 14 constant toward the outside, the other configurations are the same as in the above-described embodiment. Elements are given the same reference numerals, and other detailed descriptions are omitted.

In the apparatus for removing deposits on the inner surface of the hollow pile of this embodiment, since the position of the injection port 5 is provided at a position (above) higher than the water suction port 3a of the drainage pump 3, the level of muddy water generated in the removal operation is The drainage pump 3 can drain the water before reaching the injection port 5, whereby the injection port can always be maintained in an exposed state without being submerged, and the hollow pile 14 of pressurized water supplied by the submergence of the injection port 5. Attenuation of pressure hitting the inner surface can be prevented, and a reduction in cleaning power can be prevented.
In addition, since the machine frame 2 is provided with the spacer 13 for keeping the distance (interval) between the injection port 5 and the hollow pile 14 constant, the apparatus body 1 is inserted into the hollow pile 14 and lowered. When it is raised, the distance (interval) between the injection port 5 and the inner surface of the hollow pile 14 can always be maintained at an appropriate distance (interval), and the cleaning power can always be maintained optimally. Although there is no restriction | limiting in particular in the structure of this spacer 13, If the wheel 13a which can be freely rotated is provided in the front-end | tip as shown in this embodiment and this wheel 13a is set as the structure contact | abutted to the hollow pile 14 inner surface, It is preferable because the movement of descending and ascending becomes smooth. Further, although not shown, a plurality of spacers may be provided in the vertical direction. The rest is the same as in the above embodiment.

Next, a method for removing deposits on the inner surface of the hollow pile using the deposit removal device on the inner surface of the hollow pile will be described.
The basic method for removing deposits on the inner surface of a hollow pile is that after the hollow pile 14 is laid in the ground, the apparatus body 1 is suspended from a heavy machine 11 such as a crane as shown in FIG. The device body 1 is lowered or raised from the lowered position while being inserted into the hollow pile 14, supplied with water to the jet pipe 4 by the water supply pump 6, and sprayed from the injection port 5 toward the inner surface of the hollow pile 14. In this method, the deposits on the inner surface are washed and removed, and the generated muddy water in the hollow pile 14 is discharged to the outside by the drainage pump 3 through the drainage hose 9.

An example in which this method is implemented in the digging method will be described with reference to FIG. FIG. 5 is a cross-sectional explanatory view showing a method for removing the inner surface deposits of the hollow pile placed by the digging method in order of steps (a) (b) (c) (d) (e).
First, the screw auger 16 is inserted concentrically into the hollow pile 14 standing on the ground, and the hollow pile 14 is press-fitted while excavating by rotating the screw auger 16 with a construction machine (not shown). Sink inside. FIG. 5A shows a state in which the hollow pile 14 has been entered into the ground G to a predetermined depth in this way. In this construction, at the top of the hollow pile 14, a hollow pile 14 is connected to a construction machine (not shown), and a Yatco 15 is attached for press-fitting and pulling out. In this example, the hollow pile 14 is a steel pipe pile having a diameter of 1 m and a length of 6 m, and a case where a 2 m Yatco 15 is attached to the top of the hollow pile 14 is shown.
Next, when the hollow pile 14 reaches a predetermined depth as shown in FIG. 5 (a), the press-in of the hollow pile 14 is stopped and the screw auger 16 is pulled out as shown in FIG. 5 (b) to the ground. to recover.
When the hollow pile 14 is thus laid, the apparatus body 1 is then suspended from a heavy machine 11 such as a crane as shown in FIG. While supplying pressurized water to the ejection pipe 4 and injecting it from the injection port 5 toward the inner surface of the hollow pile 14, the apparatus main body 1 is lowered or raised from the lowered position, and the deposits on the inner surface of the hollow pile 14 are washed away. FIG. 5C shows this state.

The cleaning and removing step by injecting the pressurized water is sequentially lowered in the depth direction (up to the removal range) from the upper part of the hollow pile 14 while supplying the pressurized water by the water supply pump 6 and injecting the pressurized water from the injection port 5 toward the inner surface of the hollow pile 14. Or a step of sequentially lowering in the depth direction (to the removal range) from the upper part of the hollow pile 14 while supplying pressurized water by the water supply pump 6 and injecting it from the injection port 5 toward the inner surface of the hollow pile 14 and upward from the lowered position. You may repeat the process which raises sequentially to several times. Thereby, the deposit | attachment of the hollow pile 14 inner surface is wash | cleaned and removed reliably. When the injection port 5 of the apparatus main body 1 is submerged with the muddy water washed and removed during this operation, the muddy water is washed and removed while being drained by the drainage pump 3.
Next, when the deposits on the inner surface of the hollow pile 14 can be washed and removed, the water supply is stopped, and the muddy water in the hollow pile 14 is drained by the drainage pump 3 as shown in FIG. Is completed. Finally, when the cleaning removal is completed, the apparatus main body 1 is lifted from the hollow pile 14 and collected on the ground, and the attached substance cleaning removal state on the inner surface of the hollow pile 14 is visually confirmed as shown in FIG. If there is no deposit removal residue, the removal operation is completed.

  The cycle of the washing removal process and the draining process by injecting the pressurized water here is not particularly limited, and the apparatus body 1 is lowered and the pressurized water is injected from the injection port 5 toward the inner surface of the hollow pile 14 for cleaning. The step of removing, the step of injecting pressurized water from the injection port 5 toward the inner surface of the hollow pile 14 while raising the apparatus main body 1 from the lowered position, and the draining step may be appropriately combined. In addition, the apparatus body 1 is lowered and raised at this time, and the drainage time is also within an optimum range.

  In particular, the discharge pressure of pressurized water (cleaning water) injected toward the inner surface of the hollow pile 14 at the injection port 5 is high and the discharge amount is large. As a result, there arises a disadvantage that a high-pressure grout pump or the like is required. In the extent of removing deposits on the inner surface of the hollow pile 14 of the present invention, the discharge pressure of pressurized water (washing water) may be in the range of 0.1 MPa to 1 MPa, and 0.3 MPa or more is particularly preferable. If it is about 1 MPa, a low-pressure grout pump can be used as the feed water pump 6 and a discharge pipe having a circumferential length of 2.65 m with respect to a hollow pile having a diameter of 1 m in order to secure the discharge pressure. 4. When 16 injection holes 5 having a diameter of 8 mm are provided at regular intervals, the discharge amount of pressurized water (washing water) is about 400 liters per minute, which is preferable because it can be handled by a low-pressure grout pump.

  Moreover, when the muddy water generated in the removal of the deposits on the inner surface of the hollow pile is drained to the settling tank by the drainage pump 3 through the drainage hose 9, the water in which contaminants such as earth and sand are precipitated is re-used as washing water. This is preferable because it can be used. In addition, if muddy water-like soil or soil cement generated by removing the deposits on the inner surface of the hollow pile is discharged to the pit or the like through the drainage hose 9 to the drainage pump (submersible pump) 3, the work site is not contaminated. It is preferable because the environment can be improved and the natural environment is not polluted.

Furthermore, after the work for cleaning and removing the deposits on the inner surface of the hollow pile 14 is completed (after the process of FIG. 5E), the Yatsuko 15 portion may be backfilled. In that case, the upper opening of the hollow pile 14 is closed with a pile lid.
6 is a perspective view showing an example of a pile lid, FIG. 7 is a cross-sectional view showing a state in which the pile lid is attached, and FIG. 8 is a partially enlarged perspective view of FIG.
The pile lid 17 has a lid main body 18 having an outer diameter substantially the same as the inner diameter of the hollow pile 14 and the same shape, a slippage-preventing member 19 suspended from the lower surface outside the lid main body 18, and an upper surface of the lid main body 18. It is comprised from the hanging metal fitting 20 projected. On the other hand, a lid receiving member 21 that receives the pile lid 17 is annularly provided on the upper inner peripheral surface of the hollow pile 14 along the circumferential direction. Since the lid body 18 of the pile lid 17 has an outer diameter that is substantially the same as the inner diameter of the hollow pile 14, the pile lid 17 is shown in FIGS. 7 and 8 when attached to the upper opening of the hollow pile 14. In this way, the hollow pile 14 enters the hollow, and the outer periphery of the lower surface of the lid body 18 is received by the lid receiving member 21 and closed. Therefore, the attachment position of the lid receiving member 21 is preferably a position that does not come off when the pile lid 17 is attached above the hollow pile 14 and the inner peripheral surface of the Yatco that is attached later does not hit the pile lid 17.
Further, when the hollow pile 14 is closed with the pile lid 17, the displacement preventing member 19 is positioned so as to contact the inner peripheral surface inside the annular lid receiving member 21 as shown in FIGS. 7 and 8. When the 15 portion is backfilled with earth and sand, the pile lid 17 is prevented from being overturned or displaced due to the impact or uneven load of the earth and sand. Accordingly, the displacement preventing member 19 is suspended from the outer peripheral edge of the lower surface of the lid body 18 at a position that is substantially the same as the thickness h of the lid receiving member 21 and enters the inside by a width. A plurality of the shift preventing members 19 are vertically suspended at a predetermined interval along the outer periphery of the lower surface of the lid body 18. In this example, four cases are provided at a predetermined interval (interval of 90 ° in the circumferential direction). In addition, it is preferable that the slip prevention member 19 has a tapered surface 19a on the lower side, as shown in the drawing, since it can be easily attached by being guided into the lid receiving member 21 when the pile lid 17 is attached.
Further, the hanging metal fitting 20 is used when the pile lid 17 is attached or removed and is hung by inserting a string or a wire or hanging a hook.

  When the pile lid 17 is attached to the upper opening of the hollow pile 14 as shown in FIG. 7, the lid body 18 is inserted with almost no gap between the hollow inner peripheral surface of the hollow pile 14 and the lid receiving member. 21, the hollow portion (opening) of the hollow pile 14 is closed. At this time, the displacement preventing member 19 is in a position in contact with the inner peripheral surface inside the annular lid receiving member 21. Therefore, even if the pile lid 17 is backfilled with earth and sand, the pile lid 17 is prevented from being overturned or displaced due to the impact or uneven load of the earth and sand. 21 is pressed against and tightly closed.

  The above embodiment is not intended to limit the present invention, and various modifications of the present invention are allowed without departing from the spirit of the present invention.

  The apparatus for removing deposits on the inner surface of a hollow pile according to the present invention and the method for removing deposits on the inner surface of a hollow pile using the apparatus are suitable for removing deposits on the inner surface of a hollow pile, but are present at the pile head of the hollow pile. It can also be applied to the removal of unnecessary liquid or gel-like cement milk and slime.

It is a perspective view which shows the deposit removal apparatus of the hollow pile inner surface which concerns on embodiment of this invention. It is sectional drawing which shows the deposit removal apparatus of the hollow pile inner surface which concerns on embodiment of this invention. It is a perspective view which shows the deposit | attachment removal apparatus of the hollow pile inner surface which concerns on other embodiment of this invention. It is sectional drawing which shows the deposit removal apparatus of the hollow pile inner surface which concerns on other embodiment of this invention. It is sectional explanatory drawing which shows the removal method of the inner surface deposit | attachment of the hollow pile placed by the digging method in order of a process (a) (b) (c) (d) (e). It is a perspective view which shows an example of a pile cover. It is sectional drawing which shows the state which attached the pile cover. FIG. 8 is a partially enlarged perspective view of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Machine frame 2a Inner cylinder 2b Outer cylinder 2c Connecting member 3 Drain pump 3a Water intake port 4 Jet pipe 5 Injection port 6 Water supply pump 7 Water supply hose 8 Water storage tank 9 Drain hose 10 Suspension means 11 Heavy machinery 12 such as crane 12 Mud 13 Spacer 13a Wheel 14 Hollow pile 15 Yatco 16 Screw auger 17 Pile lid 18 Lid body 19 Displacement stopping member 20 Suspension fitting 21 Lid receiving member G Ground

Claims (5)

  An apparatus main body in which a plurality of jet pipes with a plurality of jet nozzles facing outward are provided on the outer periphery of the machine frame on which the drainage pump is mounted, and can be inserted into the hollow of the hollow pile. Is connected to an external water supply pump through a water supply hose.   The deposit removing device for an inner surface of a hollow pile according to claim 1, wherein the injection port is provided at a position higher than the position of the water suction port of the drainage pump.   The deposit on the inner surface of the hollow pile according to any one of claims 1 to 2, wherein the machine frame is provided with a spacer for maintaining a substantially constant distance between the injection port and the inner surface of the hollow pile. Removal device. It is the deposit removal method of a hollow pile inner surface using the deposit removal apparatus of the hollow pile inner surface in any one of Claims 1-3,
After placing the hollow pile in the ground, suspend the device body and insert it into the hollow pile from the upper opening, supplying water to the discharge pipe by the water supply pump and spraying it from the injection port toward the inner surface of the hollow pile, Remove the deposits on the inner surface of the hollow pile by lifting the device main body from the lowered or lowered position to clean and remove the deposits on the inner surface of the hollow pile and allowing the generated muddy water in the hollow pile to be drained by the drainage pump. Method.   The device body suspended in the hollow pile is supplied with water by a water supply pump and sprayed from the injection port toward the inner surface of the hollow pile, while descending in the depth direction from the upper part of the hollow pile, and upward from the lowered position. 5. The method for removing deposits on the inner surface of a hollow pile according to claim 4, wherein the step of sequentially raising is repeated a plurality of times.

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