JP2006045983A - Foundation pile, its construction method, and slime handling device used for the construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent placed concrete from being contaminated with slime in constructing a foundation pile. <P>SOLUTION: A slime handling device 20 is provided with a water jet mechanism 21 for jetting external fresh water W1 in a pile hole 2, and a lifting device 22 for moving jet parts 31 of the water jet mechanism 21 up and down. The water jet mechanism 21 jets fresh water W1 from the jet parts 31 of pipes 30 when the fresh water W1 is force-fed to an annular tank 35 by a force-feed pump 26. Each pipe 30 is locked at a requested angle by a locking part 23. In construction, the jet parts 31 are lowered into proximity to the bottom 2C of a steel pipe pile 13, and the water W1 is jetted from the jet parts 31 to push up slime S on concrete C placed from a tremie pipe 27, thus carrying out construction in the state of eliminating the slime S on the placed concrete C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a foundation pile constructed by disposing a tubular support pile in an excavated pile hole, a construction method thereof, and a slime processing apparatus used for the construction.

    Conventionally, as a method for constructing a cast-in-place steel pipe concrete pile, for example, a steel pipe simultaneous erection method as shown in FIG. 11 and a same-diameter excavation method as shown in FIG. 12 are known. In the steel pipe simultaneous erection method shown in FIG. 11, the pile hole 2 is first excavated by a method such as an earth drill method or a reverse method (see FIG. 11A). The excavation diameter D1 of the steel pipe insertion portion 2A is set to an outer diameter D2 + 200 mm or more of the steel pipe 3, and the fixed-sized steel pipes 3 are sequentially joined on the ground (see FIG. 11B) and built (see FIG. 11C). ). Thereafter, a tremy pipe is placed in the steel pipe 3 and concrete C is placed (see FIG. 11D), the concrete C overflows from the top of the steel pipe 3, and if necessary, the vibrator 5 is used to make the steel pipe. The concrete C is filled between the outer periphery of 3 and the inner surface of the pile hole 2 (see FIG. 11E).

  In the same-diameter excavation method as shown in FIG. 12, the pile hole 12 is first excavated by a method such as an earth drill method or a reverse method (see FIG. 12A). Next, a steel pipe 13 having a diameter D4 that is the same diameter as or slightly larger than the excavation diameter D3 of the steel pipe insertion portion 12A is press-fitted with a power jack (vibro hammer, kelly bar) 16 (see FIG. 12B). Thereafter, the inner surface of the steel pipe 13 is cleaned (see (C) in FIG. 12), slime treatment is performed (see (D) in FIG. 12), and concrete C is placed by a tremy pipe (see FIG. 12). (See (E)).

In such a conventional method for building a foundation pile, it is necessary to treat slime (drilling waste, sand / silt fine powder with a specific gravity of about 1.5 to 2.2) generated by excavation before placing concrete. For this reason, as a method for treating slime, the present inventors, for example, provide a fresh water injection pipe at the lower end of the tremmy pipe, inject high-pressure fresh water, stir and float the slime precipitated at the hole bottom, and When the air flow is generated from the air lift nozzle connected to the pipe, and the mud water is circulated by this air flow, and the stirring and rising of the hole bottom slime is confirmed, the jet of compressed air and fresh water is stopped, and immediately from the tremy pipe We have already proposed a slime treatment method in which concrete is cast. (See Patent Document 1).
Japanese Utility Model Publication No. 54-42484 (2nd page, Fig. 3)

  However, in the conventional slime treatment method, as shown in FIG. 13, for example, when applied to the steel pipe piles 3 and 13, the slime is agitated by the circulating flow of muddy water and the steel pipe piles 3 and 13. There is a problem that the entrainment of slime between the inner peripheral surface and the sand S adheres between the concrete C and the steel pipe piles 3 and 13 and on the flange portion 18 (see FIG. 13). For this reason, in the conventional construction method, after the concrete is hardened, the portion to which the sand S adheres is shaved, and the space into which the sand S is shaved is filled with concrete. For this reason, there is a problem that not only the work is troublesome, but also a boundary surface is formed between the concrete placed first and the concrete filled later, which is not preferable in terms of strength.

  The present invention has been made in order to solve the above-described problems, and provides a foundation pile that can reliably construct and process slime with a simple configuration, a method for constructing the foundation pile, and a slime processing apparatus used for the construction. It is for the purpose.

The foundation pile according to the present invention is a foundation pile that is constructed by placing a tremy pipe in at least one of the inside and outside of a tubular pile arranged under the ground,
It is placed close to the bottom of the pile, blows out water with a lighter specific gravity than the slime supplied from the outside, pushes up the slime on the concrete placed by the tremy pipe, and raises it in response to the rise in the level of the placed concrete The slime removing means is provided, and when the concrete is placed, the slime at the placement site is excluded and the construction is performed.

  In the foundation pile which concerns on this invention, when a slime exclusion means is arrange | positioned close to a pile bottom, it will blow out the water whose specific gravity is lighter than the slime supplied from the outside. When concrete is cast from the tremy pipe, the slime on the cast concrete is pushed upward by water having a low specific gravity. For this reason, slime is not caught in the concrete to be laid. Since the slime removing means is pulled up in response to an increase in the level of the cast concrete, the concrete is cast in a state where the slime is always removed at the concrete placing site, and sand does not adhere to the cast concrete. For this reason, the foundation pile which sand does not adhere is built.

  Moreover, as for the foundation pile which concerns on Claim 2, a tubular pile is any one of a steel pipe pile or a precast concrete pipe pile, Comprising: The flange part connected via a structural frame and a connection tool is formed in an upper end part. It is what I did.

  In the foundation pile which concerns on Claim 2, even if concrete is cast in a flange part, sand does not adhere.

  The foundation pile according to claim 3 is such that the foundation pile is a bottom-extended pile whose diameter is expanded at the bottom.

  In the foundation pile which concerns on Claim 3, even if concrete is cast in an expanded base part, sand does not adhere.

  Moreover, the construction method of a foundation pile according to the present invention is the construction of a foundation pile that is constructed by placing a tubular pile under the ground and placing a tremely pipe on at least one of the inside and outside of the tubular pile to cast concrete. In the method, it is located close to the pile bottom, blows water with a lighter specific gravity than the slime supplied from the outside and pushes up the slime on the concrete placed by the tremey pipe upward to cope with the level rise of the placed concrete Thus, a slime removing means to be pulled up is provided so as to exclude the slime at the placement site when placing concrete.

  In the foundation pile construction method according to the present invention, first, the slime removing means is disposed close to the pile bottom, and water having a specific gravity is blown out from the slime supplied from the outside by this slime removing means, The precipitated slime is stirred and the stirred slime is gradually pushed up. Next, concrete is cast from the tremmy pipe in a state where the slime is pushed upward from the hole bottom. The concrete is cast with the slime removed. Next, when the level of the cast concrete rises, the slime removing means is raised corresponding to the level. In this way, since the concrete is cast in a state where the slime is always removed at the concrete placement site, sand does not adhere to the cast concrete. For this reason, when placing concrete in the tubular pile, sand does not adhere between the concrete and the inner peripheral surface of the tubular pile, and when placing concrete between the pile hole and the tubular pile. However, sand does not adhere between the concrete and the outer peripheral surface of the tubular pile or the inner peripheral surface of the pile hole.

  The slime processing apparatus used for the construction of a foundation pile according to the present invention is a foundation in which a tubular pile is disposed under the ground, and a tremy tube is disposed in at least one of the inside and outside of the tubular pile, and concrete is cast and constructed. In the slime processing equipment used for the construction of the pile, it is placed close to the bottom of the pile, and the slime on the concrete is pushed up by blowing out water with a specific gravity lower than the slime supplied from outside, It is equipped with slime removal means that can be pulled up in response to an increase in the level of cast concrete.

  In the slime processing apparatus used for the construction of the foundation pile according to the present invention, first, the slime removing means is arranged close to the pile bottom, and water having a specific gravity lower than that of the slime supplied from the outside is blown out by the slime removing means. The slime precipitated at the bottom of the hole is stirred, and the stirred slime is gradually pushed upward. Next, concrete is cast from the tremmy pipe in a state where the slime is pushed upward from the hole bottom. The concrete is cast with the slime removed. Next, when the level of the cast concrete rises, the slime removing means is raised corresponding to the level. In this way, since the concrete is cast in a state where the slime is always removed at the concrete placement site, sand does not adhere to the cast concrete. For this reason, when placing concrete in the tubular pile, sand does not adhere between the concrete and the inner peripheral surface of the tubular pile, and when placing concrete between the pile hole and the tubular pile. However, sand does not adhere between the concrete and the outer peripheral surface of the tubular pile or the inner peripheral surface of the pile hole.

  In the slime treatment apparatus according to the sixth aspect, the slime removing means can adjust the radial position of the water blowing portion in accordance with the pile diameter.

  The slime processing apparatus according to claim 6 can be used for an expanded bottom pile or a pile having a different pile diameter, and versatility is improved.

  In the slime treatment apparatus according to claim 7, the slime removing means includes a water blowing mechanism for blowing water supplied from outside in the pile hole, and suspending the water blowing mechanism in the vicinity of the pile bottom. An elevating device that lifts in response to ascent, and the water blowing mechanism includes a pressure pump, an annular tank connected to the pressure pump through a flexible tube, and a lower side of the annular tank The pipe is connected to the annular tank so as to be rotatable at a predetermined interval, and the pipe is connected to the annular tank, the lock is rotatably supported, and the pipe is locked at a desired rotation angle. It is configured to include a blow-out portion that is attached and bent in the lateral direction to form a large number of blow-out holes.

  In the slime processing apparatus according to claim 7, when the pipe is turned, the blowout portion bent at the lower end rotates around the pipe axis and locks by adjusting the rotation angle, thereby staking the blowout hole of the blowout portion. It can be arranged at a position far from the axis or at a close position. For this reason, it can be used for piles with different pile diameters.

The foundation pile according to the present invention is a foundation pile that is constructed by placing a tremy pipe in at least one of the inside and outside of a tubular pile arranged under the ground,
It is placed close to the bottom of the pile, blows out water with a lighter specific gravity than the slime supplied from the outside, pushes up the slime on the concrete placed by the tremy pipe, and raises it in response to the rise in the level of the placed concrete Slime removal means is provided, and when placing concrete, it is constructed so as to eliminate the slime at the placement site, so there is no foundation for piles where sand does not adhere to the placed concrete. Can be built.

  The foundation pile construction method according to the present invention is a foundation pile construction method in which a tubular pile is disposed under the ground, and a tremy tube is disposed in at least one of the inside and outside of the tubular pile, and concrete is cast and constructed. , Placed near the bottom of the pile, blown out water with a lighter specific gravity than the slime supplied from the outside, and pushed up the slime on the concrete placed by the tremey pipe upward, in response to the rise in the level of the placed concrete Since the slime removing means to be pulled up is provided and the slime at the placement site is excluded at the time of placing the concrete, the concrete is placed in a state where the slime is always removed at the concrete placement site. For this reason, it is possible to build a foundation pile in which slime is not caught in the cast concrete and sand does not adhere.

  The slime processing apparatus used for the construction of a foundation pile according to the present invention is a foundation in which a tubular pile is disposed under the ground, and a tremy tube is disposed on at least one of the inside and outside of the tubular pile, and concrete is cast and constructed. In the slime processing equipment used for the construction of the pile, it is placed close to the bottom of the pile, and the slime on the concrete is pushed up by blowing out water with a lighter specific gravity than the slime supplied from the outside, Since the slime removing means that is pulled up in response to the rise in the level of the placed concrete is provided, the concrete is placed in a state where the slime is always removed at the concrete placement site. For this reason, it is possible to build a foundation pile in which slime is not caught in concrete and sand does not adhere.

  For the purpose of preventing sand from adhering to the concrete, a slime removing means is arranged near the bottom of the pile, and water with a lighter specific gravity than the slime supplied from outside is blown out to push the slime upward, and then the tremy pipe This was achieved by placing concrete from the top, removing slime from the top of the cast concrete, gradually raising the slime removal means as the level of the cast concrete increased, and constantly removing the slime from the concrete placement site.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is an overall view of a slime processing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the slime processing apparatus (slime removing means) 20 according to the present embodiment is disposed on a steel pipe pile (tubular pile) 13 press-fitted into the pile hole 2 and the ground part. The slime treatment device 20 includes a water blowing mechanism 21 that blows water W1 supplied from the outside in the pile hole 2 and a lifting device 22 that raises and lowers the water blowing mechanism 21.

  The water blowing mechanism 21 includes a pressure feed pump 26 installed on the ground, an annular tank 35 connected to the pressure feed pump 26 via a flexible pipe (water supply hose) 24, and a predetermined lower side of the annular tank 35. , A pipe 30 communicating with the annular tank 35, a lock portion 23 for rotatably supporting the pipe 30 and locking the pipe 30 at a desired rotation angle, and a pipe. A blowout portion 31 that is replaceably attached to the lower end of 30 and is bent in the lateral direction and has a plurality of blowout holes 29 formed therein. The pumping pump 26 pumps the water W1 stored in the storage tank 25 on the ground to the pipe 30 through the annular tank 35 with a desired water pressure and amount. The water W1 is water having a specific gravity lower than that of the slime S, in which fresh water or shavings accompanying excavation is not mixed. That is, water with some dirt may be used as long as the slime S is filtered or settled to remove shavings. In FIG. 1, reference numerals 27, 28, and 4 denote a tremy pipe, a drainage pump, and a reinforcing bar, respectively.

  As shown in FIG. 2 (B), the annular tank 35 has a tremmy tube 27 disposed in the inner circular hole, and halved tank portions 35A and 35B are connected by joint portions 60A and 60B. It can be moved up and down. A suspension piece 40A is provided on the upper surface of the annular tank 35 in the circumferential direction, and is connected to the suspension wires 22A and 22B of the lifting device 20. Each of the half tank portions 35A and 35B is provided with a supply port 42 connected to the flexible tube 24. The upper and lower ends of the tremy tube 27 have diameter-expanding portions that gradually increase in diameter, and flanges 64 are formed at the ends of the diameter-expanded portions, respectively. The diameter of the flange 64 is larger than the inner circular hole of the tank 35, and the tank 35 is placed on the enlarged diameter portion of the tremmy tube 27 or the lower end flange 64. The tank 35 is mounted on the flange 64 and moved up and down integrally with the tremy tube 27, and connected to the suspension wires 22 </ b> A and 22 </ b> B of the elevating device 20 and moved up and down independently of the tremy tube 27. Yes. Although not shown, a waiter (weight) may be attached to the tank 35 so that the tank 35 is surely dropped in the stabilizing liquid.

  The blowout part 31 is formed by bending a cylinder whose tip is closed, and the blowout holes 29 are formed in multiple directions. The upper part of the blowing part 31 is connected to the lower end of the pipe 30 and has a larger diameter than the pipe 30. An upper support portion 32 and a lower support portion 33 are provided on the upper and lower portions of the pipes 30, respectively. The upper end portion of the pipe 30 is connected to and communicated with the annular tank 35 via the connector 34. The lower support portion 33 is fitted on the outer periphery of the pipe 30 and connects the cylindrical body 36 mounted on the upper end surface 31A of the blowing section 31 so as to be rotatable relative to the pipe 30 and the adjacent cylindrical bodies 36. The connecting rod 37 is provided (see FIG. 5). As shown in FIGS. 4 and 6, the upper support portion 32 has a C-shaped ring 38 that is removably fitted on the same plane of each pipe 30 and a hole that matches the circumferential position of the pipe 30. And an annular disk 40 having a hole 39 through which the pipe 30 passes. When the annular disk 40 is fitted into the pipe 30, it is placed on the C-shaped ring 38.

  As shown in FIG. 4, a discharge port 41 is provided on the lower surface of the annular tank 35 so as to match the circumferential position of the pipe 30. The connector 34 has a lower end connected to the upper end opening of the pipe 30 and an upper end connected to the discharge port 41 of the annular tank 35 while allowing the pipe 30 to rotate. For this reason, the pipe 30 is supported by the cylindrical body 36, the annular disk 40, and the connector 34 to rotate. The supply port 42 at the upper part of the annular tank 35 is connected to the pumping pump 26 through the flexible tube 24. When the water W <b> 1 of the storage tank 25 is sent into the tank 35 through the flexible pipe 24 by the pressure pump 26, the tank 35 adjusts the water flow and uniformly pumps it to each pipe 30.

  As shown in FIG. 6, a positioning disk 50 is attached to the pipe 30 and slides on the upper surface of the annular disk 40. A number of positioning holes 51 are formed in the positioning disk 50 at predetermined intervals along the circumferential direction. Pin insertion holes 52A and 52B are formed in the annular disk 40 at positions where a circle formed by connecting the axial centers of the holes 39 and a circle formed by connecting the positioning holes 51 intersect. For this reason, when the pipe 30 adjusts the rotation angle so that the positioning hole 51 of the positioning disk 50 is aligned with one of the pin insertion holes 52A and 52B and the pin 53 is inserted, the blowing portion 31 is at that angle. It is supposed to be locked. That is, by rotating the pipe 30 and setting it to a desired angle, it is possible to adjust the blowing portion 31 so as to be close to the pile wall without interfering with the pile wall according to the inner diameter of the steel pipe pile.

  Next, the construction method of a foundation pile is demonstrated based on the effect | action of the slime processing apparatus 20 which concerns on the said Example. In the case of the same diameter excavation method as shown in FIG. 1, first, the pile hole 2 is excavated by a method such as an earth drill method or a reverse method, and then a steel pipe 13 having a diameter equal to or slightly larger than the excavation diameter. Is press-fitted with a power jack (vibro hammer, Keriba) (not shown), and then the inner surface of the steel pipe 13 is cleaned.

  On the other hand, on the ground, first, the tank 35 is attached to the tremy tube 27. Next, the annular disk 40 is inserted into the pipe 30 from below and brought into contact with the positioning disk 50, and the C-shaped ring 38 is attached to the lower side of the annular disk 40. Next, the cylindrical body 36 is inserted into the pipe 30 from below, and the blowing portion 31 is attached to the lower end of the pipe 30. Next, the upper end of the pipe 30 and the discharge port 41 of the annular tank 35 are connected by the connector 34. Next, each pipe 30 is rotated, and the angle is adjusted so that the tip of the blowing part 31 is located in the vicinity of the pile wall according to the pile diameter, and the pin 53 is locked. The supply port 42 of the annular tank and the pressure pump 26 are connected by the flexible tube 24.

  Next, in a state where the tank 35 in which the pipe 30 is assembled is placed on the enlarged diameter portion or the flange 64 at the lower end of the tremmy pipe 27 (see FIG. 7A), the tremy pipe 27 is sequentially added to the pipe. It is suspended in the steel pipe pile 13 and the concrete discharge port of the tremy pipe 27 is disposed in the vicinity of the hole bottom 2C (see FIG. 7B). At this time, the hole is filled with the stabilizing liquid (specific gravity of the stabilizing liquid near the hole bottom is 1.05 to 1.2), and the slime S is precipitated on the hole bottom 2C. The tank 35 is connected to the lifting / lowering device 22 via a hanging wire 22A. Next, the drainage pump 28 is arranged, the pumping pump 26 is driven, the water W1 is supplied to the blowout part 23, and the drainage pump 28 is also driven. At this time, the water pressure and the amount of water supplied from the pressure pump 26 to the blowing part 31 are sufficient to stir the slime S precipitated in the hole bottom 2C and push the stirred slime S upward. Is set. Water having a specific gravity lower than that of the slime S supplied from the pressure pump 26, for example, fresh water W1, flows out from the annular tank 35 to each pipe 30 and becomes a blow-up ascending water flow from the blowout holes 29 of the blowout portion 31 in multiple directions (see FIG. 8 (A) and (B)). For this reason, the slime S precipitated on the hole bottom 2C is stirred, the stirred slime S is gradually pushed upward, and the pile hole space around the hole bottom 2C is filled with the water W1 while being pushed up, and the slime S Is eliminated (see FIG. 7C).

  Next, concrete C is placed by the tremy tube 27. The concrete C is placed in a pile hole space on the hole bottom 2C from which the slime S has been removed (see FIG. 7D). Next, when the level L of the cast concrete C rises, the tremy pipe 27 is pulled up together with the tank 35 integral with the pipe 30 corresponding to the level L, and each time the slime S is removed and filled with water W1. Concrete C is placed in the pile hole space in the state. That is, on the concrete C to be placed, the slime S is always excluded and the state filled with the water W1 is ensured. In this way, as the level of the cast concrete C rises, the blow-up portion 31 and the tremy pipe 27 are pulled up and the concrete C is placed repeatedly (see FIG. 7E), and the concrete C is driven into the steel pipe pile 13. (See FIG. 7F). When the tremy tube 27 is pulled up, the tube is sequentially removed.

  Thus, in the foundation pile construction method using the slime processing apparatus 20 according to the present embodiment, the concrete C is placed in a state where the slime S is always removed at the concrete placement site. Does not involve slime S. For this reason, when placing concrete C in the steel pipe pile, sand does not adhere between the concrete C and the inner peripheral surface of the steel pipe pile 13. Moreover, in the foundation pile built by such a method, sand does not adhere between the cast concrete C and the inner peripheral surface of the steel pipe pile 13. Furthermore, sand does not adhere to the flange portion 18 as well.

  Moreover, when using the said slime processing apparatus 20 for backfilling between steel pipe pile 3A, 3B outer periphery and pile hole inner peripheral surface 2A, as shown to (A) and (B) of FIG. 9, an annular tank and annular The circular plate and the pipe are made to correspond to the backfilling surfaces F1 and F2, the connecting rod 37 is formed in an arc shape, the size is set so as not to interfere with the tremmy tube for backfilling, and the rotation angle of the pipe 30 is adjusted so that the blowing part 31 Of the steel pipe pile 3A are alternately directed toward the outer peripheral surface side of the steel pipe pile 3A and the inner peripheral surface 2A side of the pile hole (see (A) of FIG. 9) or aligned in the circumferential direction (( (See B)). By carrying out like this, it can prevent that sand adheres between backfilling concrete and the outer peripheral surface of steel pipe pile 3A, 3B, or backfilling concrete and pile hole inner peripheral surface 2A.

  When used in the expanded bottom portion 2B, as shown in FIG. 10, the bent blowing portion 131 is made of a flexible material such as a rubber tube, and is configured to extend radially outward by water pressure when blowing. And when raising the steel pipe pile 13 part with a small diameter from the expanded bottom part 2B, you may make it hit against the pile wall of the steel pipe pile 13 and pull up.

  In addition, in each said Example, although the length of the blowing part 31 is made constant, it is not restricted to this, It forms so that length may differ and it is made to select suitably according to a pile diameter, and to attach Also good. In addition, on the upper surface of the annular tank, a lightweight mesh made of fine synthetic resin with a hole through which the tremmy tube is formed at the center is provided. If there is a large amount of water from below and an upward flow is generated, the outer periphery of the mesh will bend. Allow the passage of not only the water but also the slime S, and if the amount of water from below falls below a predetermined amount, the net covers the upper surface of the annular tank and covers almost the entire surface of the pile, allowing only the passage of water from below Then, the passage of the slime S descending from above may be prevented. The partition material for separating water and earth and sand such as a net may be a fiber, cloth, or the like. Further, an accumulator may be used instead of the annular tank. In each of the above embodiments, the drainage pump 28 is provided, but the present invention is not limited to this. When the water W1 supplied by the pumping pump 26 overflows by providing a ridge on the outer periphery of the upper end of the steel pipe pile, You may make it escape by this trap. Further, in each of the above embodiments, the tank 35 arranged in an annular shape is placed on the tremy tube 27 and is lifted together. However, the present invention is not limited to this and may be moved up and down independently. Depending on the position of the concrete outlet of the tremy tube 27 and the blowing portion 31 in the vertical direction, they may be moved up and down as appropriate or may be moved up and down independently. In addition, the inner circular hole of the annular tank is formed to have a larger diameter than the enlarged portion or flange of the tremmy tube, and after connecting the tubes and installing the tremy tube, the annular tank is fitted into the tremy tube and suspended with a wire, It may be moved up and down independently of the Tremy tube. Further, the annular tank 35 is configured by connecting the half-shaped tank portions 35A and 35B, but is not limited to this, and may be formed integrally or divided into three.

It is a general view which shows the slime processing apparatus which concerns on one Example of this invention. (Example 1) (A), (B) is explanatory drawing of the principal part of the slime processing apparatus of FIG. 1, respectively. It is a perspective view which shows the attachment state of the principal part of the slime processing apparatus of FIG. It is explanatory drawing which shows typically the principal part of the slime processing apparatus of FIG. It is a perspective view which shows the pipe lower part of the slime processing apparatus of FIG. It is a perspective view which shows the pipe upper part of the slime processing apparatus of FIG. (A) thru | or (F) is explanatory drawing which shows in order the process of constructing a foundation pile using the slime processing apparatus of FIG. 1, respectively. (A), (B) is explanatory drawing which respectively shows the water flow which ejects from the blowing part of the slime processing apparatus of FIG. (A), (B) is explanatory drawing which respectively shows the rotation angle of the blowing part when using the slime processing apparatus of FIG. 1 for backfilling. It is explanatory drawing which shows the blowing part of the slime processing apparatus which concerns on the other Example of this invention. (Example 2) (A) thru | or (E) is explanatory drawing which shows the process of the foundation pile construction by the conventional steel pipe simultaneous erection method, respectively. (A) thru | or (E) are explanatory drawings which show the process of the foundation pile construction by the conventional same diameter excavation construction method in order, respectively. It is explanatory drawing which shows the state inside the foundation pile built by the conventional construction method.

Explanation of symbols

2C Pile bottom 3, 13 Steel pipe pile (tubular pile)
20 Slime treatment equipment 21 Water blowing mechanism (slime removal means)
22 Lifting device (slime exclusion means)
27 Tremy Tube C Concrete S Slime

Claims (7)

In foundation piles that are built by placing concrete with at least one of the inside and outside of the tubular pile arranged under the ground,
It is placed close to the bottom of the pile, blows out water with a lighter specific gravity than the slime supplied from the outside, pushes up the slime on the concrete placed by the tremy pipe, and raises it in response to the rise in the level of the placed concrete The foundation pile characterized by providing the slime exclusion means to be constructed and being constructed by eliminating the slime at the placement site when placing concrete.   The tubular pile is one of a steel pipe pile and a precast concrete pipe pile, and a flange portion connected to the upper end portion via a structural frame and a connection tool is formed. Foundation pile.   The foundation pile according to claim 1 or 2, wherein the foundation pile is an expanded pile having a bottom expanded in diameter. In the construction method of the foundation pile which arranges the tubular pile under the ground, arranges the tremy pipe in at least one of the inside and outside of the tubular pile and casts the concrete,
It is placed close to the bottom of the pile, blows out water with a lighter specific gravity than the slime supplied from the outside, pushes up the slime on the concrete placed by the tremy pipe, and raises it in response to the rise in the level of the placed concrete A method for constructing a foundation pile, characterized in that a slime eliminating means is provided, and slime at the placement site is eliminated during concrete placement. In the slime processing equipment used for the construction of the foundation pile that is constructed by placing the tubular pile under the ground, placing the tremy pipe in at least one of the inside and outside of the tubular pile, and placing concrete.
It is placed close to the bottom of the pile, blows out water with a lighter specific gravity than the slime supplied from the outside, pushes up the slime on the concrete placed by the tremy pipe, and raises it in response to the rise in the level of the placed concrete The slime processing apparatus used for construction of the foundation pile characterized by having the slime exclusion means.   The slime treatment apparatus according to claim 5, wherein the slime removing means is configured to adjust the radial position of the water blowing portion according to the pile diameter. The slime removing means includes a water blowing mechanism for blowing water supplied from outside in the pile hole, and a lifting device that suspends the water blowing mechanism near the bottom of the pile and lifts it according to the rise in the level of the cast concrete. And configured
The water blowing mechanism is attached to a pressure pump, an annular tank connected to the pressure pump and a flexible pipe, and a lower side of the annular tank so as to be rotatable at a predetermined interval. Pipes that communicate with each other, a lock part that rotatably supports these pipes and locks the pipe at a desired rotation angle, and is attached to the lower end of the pipe and bent in the lateral direction to form a number of blowout holes. The slime processing apparatus according to claim 6, comprising a blowing unit.

Images