JP5722189B2 - Pile foundation construction method and pile foundation structure - Google Patents

Description

  The present invention relates to a foundation pile construction method for constructing a structure on the ground by driving a pile and a pile foundation structure constructed by the method.

  There is known a transmission type sea area control structure that is installed off the coast to secure coastal erosion prevention and a quiet area (see, for example, Patent Document 1). Since this type of transmission type sea area control structure cannot be constructed with the pile and box integrated in advance, the pile and box are constructed separately, and finally the pile and box are combined to achieve integration. Yes. Therefore, as a construction method, the “pile advance method” in which the pile is first placed and the box is installed later, and the “pile follow-up method” in which the box is temporarily placed and the pile is placed later. It is roughly divided into The pile-following method requires a mound to temporarily place the box, but the pile can be driven using the temporarily placed box as a guide. Adopted.

  By the way, a member called a guide pipe exists in the transmission type sea area control structure. It is an important member for constructing piles and boxes separately and joining them together. Moreover, as mentioned above, it also plays a role as a guide material when driving a pile. In the post-pile method, when placing a pile on the slope (offshore side), the top end of the box guide tube is always immersed in water and is in a position where waves act. Is extended to the surface of the water to improve workability. The part of the guide tube protruding from the box is cut out along the slope shape and removed after the pile is driven and the box and the box are combined.

JP 2007-262890

  As a technique for cutting the above-described guide pipe (steel pipe), generally, it is divided into fusing by gas or the like, or mechanical cutting by a disk cutter, a wire saw or the like. However, fusing is impossible to apply in water. Providing a work area that is cut-off temporary and cut-off is one idea, but it is not realistic considering the shape of the box, the effects of waves, costs, and the like. Moreover, even if it is in the air, when fusing along the concrete end surface, there is a high possibility of damaging the concrete end surface, which is not preferable.

  In addition, mechanical cutting is possible even in water, and technology has been established. However, at present, the disk cutter cutter can cut only in the horizontal direction because of its structure. If the guide tube has a small diameter and a thin wall (such as a single tube), cutting with a small (manpower) cutter can be considered, but a guide tube such as a transmission type sea area control structure has a large diameter (for example, , Diameter 1300 mm), very difficult. In addition, considering the work environment (underwater, wave action, slopes, etc.), the work must be performed in a dangerous environment.

  In the case of a wire saw, it is theoretically possible to cut, but considering a jig, setup, etc., it is a very large construction, which is expensive and unrealistic.

  In view of the problems of the prior art as described above, the present invention is capable of omitting the oblique cutting of the guide tube having a high degree of difficulty, and cutting the guide tube without damaging the surface periphery of the structure protruding from the guide tube. An object of the present invention is to provide a pile foundation construction method and a pile foundation structure that can be removed.

  In order to achieve the above object, the foundation pile construction method according to the present embodiment is a foundation pile construction method for constructing a structure on the ground by placing a pile, and the structure penetrates the structure. And a guide tube disposed so as to protrude upward from a partial surface of the structure, a diameter larger than that of the guide tube, a length thereof being shorter, and positioned outside the guide tube, and An outer tube disposed in the structure so that an upper end cut in accordance with the partial surface of the structure is along the partial surface, and after the structure is installed on the ground, the A step of driving a pile through the guide tube; and an upper end portion of the guide tube protruding from a part of the structure by cutting the guide tube at a portion where the guide tube and the outer tube are doubled And a step of removing.

  According to this foundation pile construction method, since the structure is installed on the ground and the pile is driven through the guide pipe, the guide pipe protruding from the upper part of the structure is cut at the part doubled with the outer pipe. The guide tube can be easily cut and there is no possibility of damaging the structure around the guide tube protruding.

  The foundation pile construction method is preferably applied when the pile is placed on the bottom of the ground and a part of the surface of the structure is submerged or is located near the water surface. Even if the partial surface of the structure from which the guide tube protrudes is in the water or near the water surface, the cutting operation is not adversely affected.

  Further, the partial surface of the structure may be any of an inclined surface inclined with respect to the horizontal direction, a horizontal surface, or a stepped surface having a different height in the vertical direction. In this case, the upper end of the outer tube is cut so as to follow the inclined surface, horizontal surface, or uneven surface of the structure.

  The guide tube is preferably cut in a direction perpendicular to the central axis of the guide tube from the inner peripheral surface side of the guide tube. In the portion where the guide tube and the outer tube are doubled, the guide tube can be cut in the horizontal direction (when the guide tube is in the vertical direction) from the inner peripheral surface side using, for example, a disk cutter cutting machine. Thus, the oblique cutting of the guide tube having a high degree of difficulty can be replaced with a simple horizontal cutting.

  Further, it is preferable that the outer tube from which the guide tube has been cut is filled with a filling material and a region including the upper end of the outer tube is covered with a lid. In this case, a ring-shaped member is attached to the upper end of the outer tube along a part of the surface of the structure, an attachment portion protruding from the ring member is provided, and the lid is easily attached by attaching the lid to the attachment portion. Can be attached.

  The pile foundation structure according to the present embodiment is a pile foundation structure constructed on the ground by driving a pile, and is constructed by the above-described foundation pile construction method.

  According to this pile foundation structure, since the structure is installed on the ground and the pile is driven through the guide pipe, the guide pipe protruding from the upper part of the structure is cut at the portion doubled with the outer pipe. A pile foundation structure can be realized in which the guide tube can be easily cut and there is no possibility of damaging the structure around the guide tube protruding.

  According to the present invention, a pile foundation construction method capable of omitting oblique cutting of a highly difficult guide tube and capable of cutting and removing the guide tube without damaging the surface periphery of the structure protruding from the guide tube. And can provide pile foundation structures.

It is a figure which shows the transmission type sea area control structure which is an example of the pile foundation structure which can apply the pile foundation construction method of this embodiment, and is a top view (a), a front view (b), a side view (c), It is a rear view (d). It is a side view for demonstrating the conventional process (a) thru | or (f) which constructs the permeation | transmission sea area control structure 10 of FIG. 1 in a water bottom ground. It is a side view which shows the state which has arrange | positioned the outer tube | pipe to the guide tube in this embodiment. FIG. 4 is a side view of the box showing a state in which the guide pipe and the outer pipe of FIG. 3 are incorporated in the box of the transmission type sea area control structure in the present embodiment. It is principal part sectional drawing of the box of FIG. It is a side view which shows the cutting process of the guide pipe | tube of this embodiment. It is a side view which shows the pile head process process of the upper end part of the guide pipe and outer tube | pipe of the box of this embodiment. It is principal part sectional drawing for demonstrating the specific example of the cutting process of the protrusion part of the guide pipe | tube of FIG. It is the side view (a) and front view (b) which show the specific example of the double structure of the guide tube and outer tube | pipe by this embodiment. It is principal part sectional drawing for demonstrating the pile head process in the structural example of FIG. It is a figure which shows the modification of this embodiment, Comprising: It is principal part sectional drawing which shows the case where a guide pipe | tube protrudes from the horizontal surface of a structure. It is a figure which shows another modification of this embodiment, Comprising: It is principal part sectional drawing which shows the case where a guide pipe protrudes from the uneven surface of a structure.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Drawing 1 is a figure showing a permeation type sea area control structure as an example of a pile foundation structure which can apply a pile foundation construction method of this embodiment, a top view (a), a front view (b), a side view (c) ) And a rear view (d).

  The transmission type sea area control structure 10 of FIG. 1 includes a transmission type box 11 having wave-dissipating performance, and a base structure 12 including a plurality of foundation piles 29a and 29b that support the box 11. The plurality of foundation piles 29a are arranged on the front side (offshore side), and the plurality of foundation piles 29b are arranged on the rear side (land side).

  The box 11 has a front vertical wall 13 that is located on the front side (offshore side) and extends in the vertical direction, and a front inclined wall 14 that is inclined from the upper end of the front vertical wall 13, and on the rear side (land side). It has a rear wall 15 which is positioned and extends in the vertical direction, has an intermediate wall 16 parallel to the front vertical wall 13 between the front surface and the rear surface, and side walls 17 and 18 on both side surfaces. The box 11 has a top plate 19 on the top surface and a bottom plate 20 on the bottom surface.

  The front vertical wall 13 is provided with front vertical wall openings 21 that extend in the horizontal direction and open in the middle of the wall surface, and the front inclined wall 14 extends in the horizontal direction and opens in the middle of the slope. A wall opening 22 is provided. The rear wall 15 is provided with a plurality of rear wall openings 23 on the left and right in the horizontal direction. The intermediate wall 16 is provided with a plurality of intermediate wall openings 24 in the vertical direction. Further, the top plate 19 is provided with an upper surface opening 25, and the bottom plate 20 is provided with a plurality of bottom surface openings 26. Moreover, although the recessed part 18a is formed in the side walls 17 and 18, and the opening part is not provided, you may provide an opening part.

  In the box 11, the preferable opening ratio of each opening (ratio of the opening area to the member area) is 15 to 40% for the front vertical wall 13 and the front inclined wall 14, 20 to 40% for the rear wall 15, In the horizontal plates of the top plate 19 and the bottom plate 20, the ratio is 10 to 35%.

  As described above, the box 11 has the intermediate wall 16 with the intermediate wall opening 24 inside, but the inside is hollow as a whole, the surrounding members, the openings 21 provided inside, 22, 23, 24, 25, and 26 form a permeable structure that allows water to pass therethrough.

  Guide pipes 30a and 30b are arranged at portions of the box 11 where the foundation piles 29a and 29b are located so that the foundation piles 29a and 29b can be driven. The foundation piles 29 a and 29 b are driven through the guide tubes 30 a and 30 b of the box 11 to construct the foundation structure 12, and the box 11 is supported by the foundation structure 12.

  The above-described transmission type sea area control structure 10 is a low top end transmission type in which the top end height or the jetty height is about the sea level at the time of high tide and allows the passage of water from the opening. . The main dimensions of the box 11 are, for example, a horizontal width of 16 m parallel to the coastline, a height of 8 m, and a depth perpendicular to the coastline of 9.5 m, but these dimensions are examples and can be changed as appropriate. It is.

  According to the transmission type sea area control structure 10 of FIG. 1, energy loss due to breaking waves accompanying wave overtopping of the incident wave from the offshore side (waves going over the top of the box 11), the front inclined wall of the front inclined wall 14 Outflow water in the opening 22, energy loss due to turbulence due to inflow water, energy loss due to vortices generated in opposite directions due to the openings of the intermediate wall opening 24, the rear wall opening 23, and the bottom opening 26, etc. Each energy loss effect can synergize to promote wave extinction and improve the wave extinction performance due to energy loss.

  Next, a conventional method for constructing the transmission type sea area control structure 10 of FIG. 1 on the water bottom ground will be described with reference to FIG. This method is based on the post-pile method in which a transmission type sea area control structure having a guide pipe is temporarily placed at a construction position and then a pile is driven through the guide pipe. FIG. 2 is a side view for explaining the conventional steps (a) to (f) for constructing the transmission type sea area control structure 10 of FIG. 1 on the water bottom ground.

  First, as shown in FIG. 2 (a), guide pipes 30a and 30b made of steel pipes are built in an onshore production yard of a transmission type sea area control structure. Next, as shown in FIG. 2B, the box 11 incorporating the guide tubes 30a and 30b is manufactured by placing concrete. In addition, the guide pipe 30a on the front side (offshore side) of the box 11 is long and protrudes upward from a part of the front inclined wall 14 of the box 11 in order to facilitate pile driving.

  Next, as shown in FIG. 2 (c), the box 11 having the guide pipes 30a and 30b is transported to the construction position of the transmission type sea area control structure, and the temporary mounting mound M provided on the bottom G by rubble or the like. Put it on. Next, as shown in FIG. 2 (d), a foundation pile 29 a made of a steel pipe pile is driven into the bottom ground G through the guide tube 30 a of the box 11. Similarly, the foundation pile 29b which consists of a steel pipe pile through the guide pipe 30b is driven to the water bottom ground G. As described above, the guide pipes 30a and 30b are used as guides at the time of pile driving, but can also be used for stability at the time of lifting the box body 11 and securing suspension bars.

  Next, after placing the foundation piles 29a and 29b, as shown in FIG. 2 (e), the gap between the guide pipe 30a and the foundation pile 29a and the gap between the guide pipe 30b and the foundation pile 29b are respectively spaced. Filled with stuffed mortar MO or the like, the foundation piles 29a, 29b and the box 11 are combined and integrated.

  Next, as shown in FIG. 2 (f), the protruding portion 30c of the guide tube 30a on the front side (offshore side) of the box 11 is cut, and the upper ends of the guide tubes 30a and 30b are covered with a lid FT made of concrete. .

  As described above, the transmission type sea area control structure of FIG. 1 can be constructed on the bottom of the ground, but the cutting of the protruding portion 30c of the guide tube 30a in FIG. 2 (f) is an operation in water. Moreover, since the surface of the box 11 (the front inclined wall 14) is inclined, this is a difficult operation.

  Therefore, in this embodiment, the cutting operation is facilitated by cutting the protruding portion 30c of the guide tube 30a with the following configuration. Hereinafter, the configuration of the present embodiment will be described with reference to FIGS.

  FIG. 3 is a side view showing a state in which the outer tube is arranged on the guide tube in the present embodiment. FIG. 4 is a side view of the box showing a state in which the guide pipe and the outer pipe of FIG. 3 are incorporated in the box in the present embodiment. FIG. 5 is a cross-sectional view of the main part of the box of FIG.

  As shown in FIGS. 3 to 5, an outer tube 31 having a diameter larger than that of the guide tube 30 a and a shorter length is disposed outside the guide tube 30 a. The upper end 31a of the outer tube 31 is cut along the inclined surface (front inclined wall 14) of the box 11A. As shown in FIG. 5, the outer tube 31 is fixed to the guide tube 30a by welding or the like at its lower end 31b. As described above, the guide tube 30a has the outer tube 31 attached to the outside, and a part below the inclined surface (front inclined wall 14) of the box 11A is configured in a double structure.

  As shown in FIG. 4, a box 11 </ b> A incorporating a guide tube 30 a partially having a double structure with an outer tube 31 and a single tube guide tube 30 b is manufactured by concrete placement. The guide tube 30a is located on the front inclined wall 14 on the front side (offshore side) of the box 11A, and protrudes upward from the front inclined wall 14 of the box 11 for easy pile driving in a later process. It is long enough to extend above the surface of the water.

  The box 11A is transported to the construction position of the transmission type sea area control structure in the same manner as in FIG. Next, as in FIG. 2 (d), the foundation pile 29 a and the foundation pile 29 b made of steel pipe piles are driven into the water bottom ground G through the guide tubes 30 a and 30 b of the box 11 </ b> A. Next, as in FIG. 2 (e), the gap between the guide pipe 30a and the foundation pile 29a and the gap between the guide pipe 30b and the foundation pile 29b are respectively filled with the filling mortar MO, etc. 29a and 29b and the box 11A are combined and integrated.

  Next, the process of cutting the protruding portion of the guide tube 30a in the box 11A of FIGS. 4 and 5 will be described with reference to FIGS.

  FIG. 6 is a side view showing the cutting process of the guide tube of the present embodiment, and FIG. 7 is a side view showing the pile head processing process of the guide pipe and the outer pipe part of the box. FIG. 8 is a cross-sectional view of an essential part for explaining a specific example of the cutting process of the protruding portion of the guide tube of FIG.

  A disk cutter cutting machine CU that can be inserted from the upper end of the guide tube 30a will be described. As shown in FIG. 8, the disc cutter cutting machine CU includes a rotating part AI extending downward from the cylindrical upper body UP, a rotating cutting part BO provided below the rotating part AI, and a rotating cutting part BO. A motor MT provided; and a disk-shaped grindstone cutter D that is rotationally driven by a rotation shaft AX extending from the motor MT and has a diameter smaller than the inner diameter of the tube 30a. Such a disc cutter cutting machine is known as a steel pipe pile cutting machine.

  The disc cutter cutting machine CU is inserted by being suspended in the vertical direction (the central axis direction of the tube 30a) from the open upper end of the guide tube 30a, and the upper body UP and the rotary cutting unit BO are connected to the tube 30a by the positioning clamp CR or the like. Positioned on the central axis. The disk-shaped grindstone cutter D rotates at high speed via the rotation axis AX by the rotation of the motor MT, and the horizontal movement mechanism is integrated with the motor MT, the rotation axis AX, and the disk-shaped grindstone cutter D in the rotary cutting unit BO. (Not shown) moves horizontally outward in the radial direction toward the inner peripheral surface of the guide tube 30a, and the grindstone cutter D starts cutting the inner peripheral surface of the guide tube 30a. The rotation cutting unit BO is rotated by the rotation of the rotation unit AI and the position of the rotation axis AX of the grindstone cutter D is moved in the circumferential direction, so that the cutting position is moved in the horizontal direction along the inner peripheral surface of the guide tube 30a. Thus, the entire inner peripheral surface of the guide tube 30a is cut in the horizontal direction. In this way, the guide tube 30a can be cut horizontally from the inner peripheral surface by the disc cutter cutting machine CU.

  In this cutting, even if the grindstone cutter D slightly protrudes from the outer peripheral surface of the guide tube 30a, there is no problem because there is a gap between the guide tube 30a and the inner peripheral surface of the outer tube 31.

  Further, the cutting position in the vertical direction of the guide tube 30a may be any as long as it is within a range T indicated by a broken line in which the guide tube 30a and the outer tube 31 are doubled as shown in FIG. Strict cutting position positioning is not necessary. That is, the upper limit of the range T is the lowest position of the upper end 31a of the outer tube 31 along the inclined surface (front inclined wall 14) of the box 11A, and the lower limit of the range T is the lower end 31b of the outer tube 31.

  After the guide tube 30a is cut as described above, the cut-out protruding portion 30c is removed as shown in FIG.

  Next, as shown in FIG. 7, after covering the lid 35 from the upper end of the guide tube 30a to the upper end of the foundation pile 29a, the portion indicated by hatching in FIG. Filling material 32 is filled. Thereafter, a precast concrete lid 33 is disposed in the opening of the outer tube 31 filled with the filling material 32. Moreover, the lid | cover 34 is covered from the upper end of the guide pipe | tube 30b to the upper end of the foundation pile 29b.

  As described above, the box 11A can be installed by the foundation pile, and the transmission type sea area control structure of FIG. 1 can be constructed on the water bottom ground.

  According to the present embodiment, since the oblique cutting of the guide tube having a high degree of difficulty can be replaced with a simple horizontal cutting, the cutting work efficiency is remarkably improved, and the construction cost can be reduced. In addition, the guide tube can be cut and removed without damaging the concrete around the box from which the guide tube protrudes. Moreover, the pile head process by the filling material after cutting a guide pipe | tube and the lid | cover made from precast concrete can be performed easily.

  According to the conventional post-pile method, the box is manufactured and installed in a state where the guide pipe on the slope side (offshore side) protrudes on the slope, and after the pile is placed, it is cut along the slope. The guide tube is usually cut by gas or by a cutter, but it is very difficult because the cutting part is located in the water or in the intertidal zone and the cutting shape is diagonal. According to this embodiment, by arranging the outer tube on the outer periphery of the guide tube to form a double structure, the guide tube protruding from the water surface can be cut from the inner peripheral surface side, and it is difficult to obliquely Since the cutting can be performed in the horizontal direction instead of cutting, the guide tube cutting work is very easy even when the cutting portion is located in the water or in the intertidal zone.

  Next, a specific example of the double structure of the guide tube and the outer tube according to the present embodiment will be described with reference to FIG. FIG. 9 is a side view (a) and a front view (b) showing a specific example of a double structure of a guide tube and an outer tube according to the present embodiment.

  As shown in FIGS. 9 (a) and 9 (b), an outer tube 42 is disposed outside the guide tube 41 to partially have a double structure. The outer tube 42 has an inner diameter larger than the outer diameter of the guide tube 41 and is cut so as to follow the inclined surface of the box to which the upper end is attached, and the ring-shaped plate protrudes from the outer periphery of the outer tube to the upper end. 43 is attached by inclination by welding. On the surface 43a of the ring-shaped plate 43, a plurality of small-diameter rod-shaped bodies 44 are arranged upright in the circumferential direction and attached by stud welding or the like.

  The outer tube 42 is attached to the guide tube 41 by welding at the lower end 45 and is integrated with the guide tube 41. A suspension fitting 41 a for hanging and lifting is attached to the upper end of the guide tube 41.

  The guide pipe 41 is made of a steel pipe having an outer diameter of 1300 mm × thickness of 16 mm × length of 8000 mm, and the outer pipe is made of a steel pipe having an outer diameter of 1400 mm × thickness of 14 mm × length of 1000 mm. Yes, and can be changed as appropriate. Further, since the double structure of the outer tube 42 and the guide tube 41 can be processed at the factory, it can be easily and accurately manufactured.

  An example of the pile head processing in the configuration example of FIG. 9 will be described with reference to FIG. FIG. 10 is a cross-sectional view of a main part for explaining the pile head processing in the configuration example of FIG. 9.

  As shown in FIG. 10, the guide tube 41 and the outer tube 42 of FIG. 9 are incorporated into the box of the transmission type sea area control structure in the same manner as FIG. 4, and in this case, the outer tube 42 is the surface of the ring-shaped plate 43. 43a is arranged along the inclined surface 51 of the box and to be flush with the inclined surface 51. After placing the pile 29a, the portion protruding above the guide tube 41 is cut in the horizontal direction in the same manner as in FIG.

After that, a lid 47 covering the pile 29a is disposed on the upper portion of the guide tube 41, and the outer tube 42 is filled with a filling material 46 such as concrete, and then the precast concrete lid 50 is attached to the ring-shaped plate of the outer tube 42. It is attached to the surface 43a of 43. At this time, a plurality of holes are formed in advance on the back surface of the lid 50 so as to correspond to the plurality of small-diameter rod-like bodies 44 attached to the front surface 43 a of the ring-shaped plate 43, and the lid 50 is inserted into the rod-like body 44. To attach. Thereby, attachment of the lid | cover 50 becomes easy and a pile head process becomes easy.

  Further, as shown in FIG. 10, a filling material injection hole 48 for mortar and the like and a water / air vent hole 49 are provided in the lid 50, and the filling material is injected from the injection hole 48 after the lid 50 is installed. However, it may be replaced with water and air inside the pile head. Thereby, a pile head process can be performed easily.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, in the present embodiment, the case where the guide tube protrudes from the inclined surface of the box has been described. However, the present invention is not limited to this, and the guide tube 61 is like the box of FIG. It may be applied when projecting from the horizontal plane 60 of the structure, and an outer pipe 62 having a large diameter is arranged outside the guide pipe 61 so that the upper end thereof is along the horizontal plane 60.

  Further, as shown in FIG. 12, it may be applied when the guide tube 71 protrudes from the uneven surfaces 70a and 70b of the structure, and the upper ends of the outer tubes 72 are respectively placed on the high surface 70a and the low surface 70b. The outer tube 72 having a large diameter is disposed outside the guide tube 71 so that the upper ends thereof are along the surfaces 70a and 70b.

  In FIG. 8, a disc-shaped grindstone cutter is used as the disc cutter cutting machine. However, instead of the grindstone cutter, for example, a plasma torch is arranged to cut the guide tube from the inner peripheral surface side in the same manner. Good.

  In this embodiment, the box pile incorporating a plurality of guide pipes is transported to the construction position of the transmission type sea area control structure and temporarily placed, and then the foundation pile is driven (post pile method). The invention is not limited to this, and at least one of the plurality of foundation piles is previously placed (pile advance method), and at least one is placed after temporary placement of the box as in this embodiment. You may make it do.

  Further, in the present embodiment, the case of a transmission type sea area control structure has been described as an example, but the present invention is not limited to this, and can be appropriately applied to another pile foundation structure incorporating a guide pipe. It is.

  Further, in this embodiment, the foundation pile is a straight pile and the guide pipe is installed in the vertical direction, but the present invention is also applied to the case of an oblique pile, that is, the guide pipe is inclined with respect to the horizontal direction. Is possible.

DESCRIPTION OF SYMBOLS 10 Transmission type sea area control structure 11A Box 14 Front inclined wall 29a Foundation pile 30a Guide pipe 30c Protruding part 31 Outer pipe 31a Upper end 33 Lid 41 Guide pipe 42 Outer pipe 43 Ring-shaped plate 44 Rod-shaped body 50 Lid 51 Inclined surface 60 Horizontal plane 61 guide pipe 62 outer pipe 70a, 70b uneven surface 71 guide pipe 72 outer pipe CU disk cutter cutting machine G water bottom, water bottom ground

Claims (8)

A foundation pile construction method for constructing a structure on the ground by placing a pile,
The structure is
A guide tube disposed so as to penetrate the structure and protrude upward from a part of the structure;
The diameter is larger than the guide tube and the length thereof is short, located outside the guide tube, and the upper end cut in accordance with the partial surface of the structure is along the partial surface. An outer tube disposed in the structure,
Placing a pile through the guide pipe after the structure is installed on the ground; and
Cutting the guide tube at a portion where the guide tube and the outer tube are doubled, and removing the upper end portion of the guide tube protruding from a part of the structure. The foundation pile construction method. The pile is driven into the bottom of the water,
2. The foundation pile construction method according to claim 1, wherein a part of the surface of the structure is in a position to be submerged or is located in the vicinity of the water surface.   The foundation pile construction method according to claim 1 or 2, wherein a partial surface of the structure is an inclined surface inclined with respect to a horizontal direction.   3. The foundation pile construction method according to claim 1, wherein a part of the structure is a horizontal plane.   The foundation pile construction method according to claim 1 or 2, wherein the partial surface of the structure is a stepped surface having different heights in the vertical direction.   The foundation pile construction according to any one of claims 1 to 5, wherein the cutting of the guide pipe is performed in a direction orthogonal to a central axis of the guide pipe from an inner peripheral surface side of the guide pipe. Method.   The foundation pile according to any one of claims 1 to 6, wherein the outer pipe from which the guide pipe has been cut is filled with a filling material, and a region including the upper end of the outer pipe is covered with a lid. Construction method.   A pile foundation structure constructed on the ground by driving a pile, wherein the pile foundation structure is constructed by the foundation pile construction method according to any one of claims 1 to 7. .

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