JP2005105688A - Construction method of foundation pile in waste disposal site vacant lot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a foundation pile of a building structure for utilizing a waste disposal site vacant lot. <P>SOLUTION: A pile construction position of the waste disposal site vacant lot, is excavated while retaining earth by an earth retaining wall by a liner plate, up to the depth reaching an impervious sheet. The impervious sheet in an excavation bottom part is cut, and a new impervious sheet reaching up to a surface layer part of waste, is welded and added to its end part, and is pulled up in a cylindrical shape up to the surface layer part of the waste along an inner wall of the earth retaining wall in a state of loosening the impervious sheet, and the upper end is supported. The foundation pile is constructed inside the impervious sheet, and backfilling earth is filled between the impervious sheet and the foundation pile. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a method for constructing a foundation pile of a building structure in order to utilize the site of a waste disposal site, and more specifically, a foundation pile that has been subjected to a treatment that permanently prevents the outflow of pollutants. It relates to the construction method.

  After the landfill of the waste disposal site is completed, it is desirable to make effective use of the vast ruins. However, when constructing a building structure at the site of the waste disposal site, a pile foundation structure is adopted because a uniform ground supporting force cannot be obtained. However, since the bottom of the waste disposal site is treated with a water shielding sheet to prevent the outflow of contaminants, the foundation pile is constructed with a structure that does not impair the water shielding performance. Must be built.

The following construction methods are known as conventional techniques of a foundation pile construction method for the purpose of constructing the foundation pile so that the water shielding performance is not impaired.
The “pile foundation construction method in a waste disposal site” described in Patent Document 1 is a method of placing a foundation pile made of a hollow tube having a solidified material discharge hole formed on a side in a waste disposal site, A foundation pile is thrown in from the inlet provided in the ground side edge part so that the top end height may become below the height position of a water shielding sheet. Next, a power source for applying a DC voltage is connected to the cathode installed in the foundation pile and the anode installed outside the foundation pile and in the vicinity of the penetration portion of the water shielding sheet. Then, a fluidized solidifying material having the same polarity as the cathode is injected from the injection port while the power source is operated to energize between the cathode and the anode. Filling the injected fluidized solidified material from the solidified material discharge hole by electrophoresis and closing the gap with the water-impervious sheet generated when placing the foundation pile so that the water-blocking performance is not impaired. I'm trying.
JP 2002-38470 A

  However, since the foundation pile construction method according to the above-mentioned Patent Document 1 is filled with a fluidized solidifying material after the foundation pile is constructed and the gap with the water-impervious sheet is closed, when filling the foundation pile or when filling the filler In doing so, there is a problem that the pollutant flows out from the gap with the water shielding sheet.

  If the height of the solidifying material discharge hole and the water shielding sheet are not precisely matched, the gap between the solid sheet and the water shielding sheet cannot be tightly closed by the filled fluidized solidifying material, so that the foundation pile driving operation is complicated. In particular, when the water shielding sheet is laid at an inclination, it is difficult to match the heights of each other with high accuracy.

  Even if the gap between the water-impermeable sheet and the fluidized solidified material can be prevented, the fluidized solidified material is destroyed due to the subsequent settlement of the pile and the water-insulating performance is impaired. .

  In addition, the types of foundation piles that can be constructed are limited to hollow tubes, and the types and construction methods of foundation piles that can be constructed are limited.

  The purpose of the present invention is not only after construction of the foundation pile, but also during the construction of the foundation pile at the site of the waste disposal site, which can completely maintain the water shielding performance and can permanently prevent the outflow of pollutants. It is to provide a construction method.

  The next object of the present invention is to hit the foundation pile easily and without being restricted by the type and construction method of the foundation pile while maintaining the water shielding performance even when the sheet is laid at an inclination. It is to provide a method for constructing foundation piles at the site of the waste disposal site.

As a means for solving the problems of the prior art, the construction method of the foundation pile in the waste disposal site ruins according to the invention described in claim 1,
A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth reaching the water-impervious sheet while retaining it with a retaining wall such as a liner plate,
Cut the impermeable sheet in the bottom of the excavation, weld a new impermeable sheet that reaches the surface layer of the waste, and add it to the end of the excavated bottom, and loosen the impermeable sheet to the inner wall of the retaining wall. Along the process of pulling up to the surface layer of waste along the cylinder and supporting its upper end,
It comprises a step of constructing a foundation pile inside the water-impervious sheet and filling backfill soil between the water-impervious sheet and the foundation pile.

The construction method of the foundation pile in the waste disposal site ruins according to the invention described in claim 2
A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth just before reaching the water shielding sheet while retaining with the retaining wall by the casing pipe,
A step of excavating the excavation bottom while further retaining the soil with a retaining wall such as a liner plate to a depth reaching the water shielding sheet;
Cut the impermeable sheet in the bottom of the excavation, weld a new impermeable sheet that reaches the surface layer of the waste, and add it to the end of the excavated bottom, and loosen the impermeable sheet to the inner wall of the retaining wall. Along the cylinder, pulling it up to the surface of the waste, and supporting the upper end thereof,
It comprises a step of constructing a foundation pile inside the water shielding sheet, filling backfilling soil between the water shielding sheet and the foundation pile, and removing a retaining wall by a casing pipe.

The construction method of the foundation pile in the waste disposal site ruins according to the invention described in claim 3,
A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth reaching the water-impervious sheet while retaining it with a retaining wall such as a liner plate,
Cutting the water-impervious sheet in the bottom of the excavation and installing a guide pipe having a height reaching the surface layer of waste on the exposed ground;
A step of welding a new water-impervious sheet to the end of the cut water-impervious sheet and adding it, and pulling it up to the upper end of the guide pipe in a loosened state, supporting the upper end,
It comprises a step of constructing a foundation pile inside the guide pipe and filling backfill soil between the guide pipe and the foundation pile and between the retaining walls.

The construction method of the foundation pile in the waste disposal site ruins according to the invention described in claim 4,
A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth just before reaching the water shielding sheet while retaining with the retaining wall by the casing pipe,
A step of excavating the excavation bottom while further retaining the soil with a retaining wall such as a liner plate to a depth reaching the water shielding sheet;
Cutting the water-impervious sheet in the bottom of the excavation and installing a guide pipe having a height reaching the surface layer of waste on the exposed ground;
A step of welding a new water-impervious sheet to the end of the cut water-impervious sheet and adding it, and pulling it up to the upper end of the guide pipe in a loosened state, supporting the upper end,
It consists of the steps of constructing a foundation pile inside the guide pipe, filling backfill soil between the guide pipe and foundation pile and between the retaining walls, and removing the retaining wall by the casing pipe. And

Invention of Claim 5 is the construction method of the foundation pile in the waste disposal site ruins described in Claim 2,
A friction is reduced by providing a gap with a paper tube or the like between the raised water-impervious sheet and the casing pipe, or a friction reducing material such as a lubricant is applied.

Invention of Claim 6 is the construction method of the foundation pile in the waste disposal site ruins described in Claim 3,
When using a liner plate or the like as a retaining wall, after filling the backfill soil between the guide pipe and the foundation pile, guide the guide while removing the liner plate from the bottom of the excavation toward the surface. It is characterized by filling backfill soil between the pipe and the exposed side of the waste.

The foundation pile construction method in the waste disposal site according to the present invention covers the inner wall of the excavation hole with a new impermeable sheet previously added to the impermeable sheet, and then the ground exposed to the bottom of the excavation hole. Since the piles are driven directly, the water shielding performance can be maintained not only after the construction of the piles but also during construction, and the outflow of pollutants can be prevented permanently. In particular, since the water-impervious sheet is slackened, the water-impervious sheet will not be strained and broken even if the piles sink, and the outflow of pollutants can be prevented permanently.
Even if the water-impervious sheet is laid at an inclination, the structure can easily maintain the water-impervious performance.
As the piles, cast-in-place piles, embedded piles, driven piles, deep piles, etc. can be adopted, and there are no restrictions on the type of pile to be constructed and the construction method of the pile.

  After excavation to a depth that reaches the water-impervious sheet, the water-impervious sheet is cut, and a new water-impervious sheet joined to the end of the sheet is pulled up to the surface layer of waste to support it. And by constructing the foundation pile inside the raised water-impervious sheet, not only after construction of the foundation pile, but also during construction, water-proof performance is maintained, and permanent pollutants are prevented from flowing out.

  Below, based on FIG.1 and FIG.2, the Example of the construction method (henceforth a pile construction method may be abbreviated as a pile construction method) of the foundation pile in the waste disposal site ruins which concerns on the invention described in Claim 1 is shown. explain.

  In this pile construction method, as shown in FIG. 1, the pollutant of the waste 3 does not flow out to the ground 1 by laying the water shielding sheet 2 on the ground surface portion of the ground 1 and reclaiming the waste 3 thereon. Conducted in order to utilize the site of a structured waste disposal site.

  First, the pile construction position of the waste disposal site is excavated to the depth reaching the water-impervious sheet 2 while retaining with the retaining wall 5 such as a liner plate (see FIG. 2A). Specifically, excavation proceeds to a cylindrical shape having a large inner diameter so as to ensure a work space sufficiently larger than the diameter of the foundation pile 4 to be constructed. As for the excavation method, in order not to damage the water shielding sheet 2, it is excavated manually or using a heavy machine or the like to a depth before reaching the water shielding sheet 2, and then at a depth reaching the water shielding sheet 2. Drill carefully by hand.

  Next, the water-impervious sheet 2 in the excavation bottom part (bottom part of the excavation hole) exposed by excavation is cut into a shape that leaves a welding allowance with the water-impervious sheet 6 newly added. That is, a substantially central portion of the water shielding sheet 2 is cut out (cut) into a circular shape having a slightly smaller diameter than the inner diameter of the excavation hole, and the end portion (remaining portion) is formed as a welding allowance. The ground surface portion of the ground 1 on which the foundation pile 4 should be constructed appears in the hollowed out part. When cutting the water-impervious sheet 2, the surrounding waste 3 has been removed, so that no pollutant flows out.

  One end of a new water shielding sheet 6 is welded and added to the welding margin of the water shielding sheet 2. The water-impervious sheet 6 is previously formed in a cylindrical shape having substantially the same diameter as the excavation hole, and the height of the water-impervious sheet 6 causes slack when the water-impervious sheet 6 is later pulled up to the surface layer of the waste 3 It is formed higher than the height of the excavation hole so that it can be supported.

  In the state where the added water-impervious sheet 6 is slackened, it is pulled up to the surface layer portion of the waste 3 along the inner wall of the retaining wall 5, and the upper end thereof is fixed to the upper end portion of the retaining wall 5 (FIG. 2B). See). As a result, the side part of the waste 3 is covered with the earth retaining wall 5 and the water shielding sheet 6, so that the water shielding performance is reliably maintained.

  The foundation pile 4 is constructed inside the water shielding sheet 6. Since the foundation pile 4 is constructed directly on the ground 1 exposed at the bottom of the excavation hole since the structure can maintain the water-impervious performance, the foundation pile 4 has no cast piles. Embedded piles, driven piles, deep piles, etc. can be adopted.

  Finally, the foundation pile 4 is solidified as necessary, and when the backfill soil 7 such as earth and sand having excellent filling property is filled between the water-impervious sheet 6 and the foundation pile 4, the foundation pile is constructed. Completion (see FIG. 2C). The backfill soil 7 is densely filled between the water-impervious sheet 6 and the foundation pile 4 and firmly supports the foundation pile 4.

The pile construction method described above covers the inner wall of the excavation hole with a new impermeable sheet 6 previously added to the impermeable sheet 2, and then constructs the foundation pile 4 directly on the ground 1 exposed at the bottom of the excavation hole. Therefore, the water shielding performance can be maintained not only after the foundation pile 4 is constructed but also during construction, and the outflow of pollutants can be prevented permanently. In particular, since the water-impervious sheet 6 is slackened, the water-impervious sheet 6 will not be strained and broken even if the foundation pile 4 sinks, and the outflow of contaminants can be prevented permanently.
Even if the water-impervious sheet 2 is inclined and laid, a structure capable of easily maintaining the water-impervious performance can be obtained.
As the foundation pile 4, a cast-in-place pile, an embedded pile, a driven pile, a deep pile, or the like can be adopted, and the type of pile to be constructed and the construction method of the pile are not limited.

  In addition, in the present Example, although the upper end of the water-impervious sheet 6 is fixed to the upper end part of the earth retaining wall 5 and is pulled up, the state is not limited thereto. You may maintain the state which pulled up the water-impervious sheet 6 to the earth retaining wall 5 and pulled up.

  Next, the Example of the construction method of the foundation pile in the waste disposal site ruins which concerns on the invention described in Claim 2 and Claim 5 is demonstrated based on FIGS.

First, a retaining wall 8 made of a casing pipe is press-fitted to a depth before reaching the water-impervious sheet 2 at a pile construction position on the waste disposal site, and the inside of the retaining wall 8 is excavated (FIG. 4A). )). The retaining wall 8 is composed of a steel pipe or the like as in the case of a usual casing pipe, and the inner diameter thereof is larger than the diameter of the foundation pile 4 to be constructed, and a work space for constructing the foundation pile 4 inside is provided. The inner diameter is secured. As an example, the height of the earth retaining wall 8 is formed such that it can be press-fitted approximately 50 cm before the depth at which the water shielding sheet 2 is laid. Therefore, the water shielding sheet 2 is not damaged by the press-fitting of the retaining wall 8. Further, the waste 3 is firmly earthed by the earth retaining wall 8 and can be excavated at once by a heavy machine or the like to the depth where the earth retaining wall 8 is press-fitted, which contributes to shortening of the working time.
The bottom of the excavation hole is further excavated to the depth reaching the water-impervious sheet 2 while retaining with the retaining wall 9 such as a liner plate (see FIG. 4B). In this case, since excavation with heavy machinery or the like damages the water-impervious sheet 2, it is excavated carefully by hand.

  The water shielding sheet 2 in the bottom of the excavation hole exposed by excavation leaves a welding allowance so that one end of the newly added water shielding sheet 10 can be welded (cut). Even in this embodiment, when the water shielding sheet 2 is cut, the surrounding waste 3 is removed, so that the pollutant does not flow out. The water-impervious sheet 10 to be added is formed in a cylindrical shape in substantially the same manner as in Example 1, but the outer diameter is slightly smaller than the inner diameter of the retaining walls 8, 9. It is set so that a plurality of paper tubes 11... Can be provided between the water shielding sheet 10 as friction reducing materials (see FIG. 5). The height of the water-impervious sheet 10 is formed to be higher than the height of the excavation hole so that it can be supported in a slack state when pulled up to the surface layer portion of the waste 3.

  One end of the water shielding sheet 10 is welded and added to the welding margin of the water shielding sheet 2, and the water shielding sheet 10 is slackened along the inner walls of the retaining walls 8 and 9 to the surface layer portion of the waste 3. Pull up. At the same time, a plurality of paper tubes 11 are arranged between each other so that the water shielding sheet 10 is not damaged when the retaining wall 8 is pulled out, and the water shielding sheet 10 pulled up from the paper tube 11 is leaned against it. In such a state, the water shielding sheet 10 is supported (see FIG. 4C). As a result, the side part of the waste 3 is covered with the earth retaining walls 8 and 9 and the water shielding sheet 10, and a structure that reliably maintains the water shielding performance is obtained.

  The foundation pile 4 is constructed inside the water shielding sheet 10. Even in this embodiment, since the foundation pile 4 is directly constructed on the ground 1 exposed at the bottom of the excavation hole after having a structure capable of maintaining the water shielding performance, the foundation pile 4 is not changed in any way from the usual pile construction. Can be cast in place, embedded pile, driven pile, deep pile, etc.

  The foundation pile 4 is solidified as necessary, and the backfill soil 12 such as earth and sand excellent in fillability is filled between the water-impervious sheet 10 and the foundation pile 4 (see FIG. 4D). . When the earth retaining wall 8 by the casing pipe is pulled out and removed, and finally the backfill soil 13 is filled between the water shielding sheet 10 and the exposed side of the waste 3 to firmly support the foundation pile 4. Then, the construction of the foundation pile is completed (see FIG. 4E). When the earth retaining wall 8 is removed, the paper tube 11 is disposed between the earth retaining wall 8 and the water shielding sheet 10 and is maintained in a non-contact state. The water sheet 10 is not damaged and broken. In addition, the removed earth retaining wall (casing pipe) 8 can be reused for the construction of other foundation piles, which contributes to cost reduction.

In the above-described pile construction method, the inner wall of the excavation hole is covered with a new impermeable sheet 10 previously added to the impermeable sheet 2, and then the foundation pile 4 is directly constructed on the ground 1 exposed at the bottom of the excavation hole. Therefore, the water shielding performance can be maintained not only after the foundation pile 4 is constructed but also during construction, and the outflow of pollutants can be prevented permanently. In particular, since the water-impervious sheet 10 is slackened, the water-impervious sheet is not strained and broken even if the foundation pile 4 is subsidized, and the outflow of contaminants can be permanently prevented.
Even if the water-impervious sheet 2 is inclined and laid, a structure capable of easily maintaining the water-impervious performance can be obtained.
As the foundation pile 4, a cast-in-place pile, an embedded pile, a driven pile, a deep pile, or the like can be adopted, and the type of pile to be constructed and the construction method of the pile are not limited.

  In the present embodiment, the paper tube 11 is disposed between the earth retaining wall 8 and the water shielding sheet 10 and maintained in a non-contact state, but this is not restrictive. Even if a friction reducing material such as a lubricant is applied between the earth retaining wall 8 and the water shielding sheet 10 and the earth retaining wall 8 is pulled out, the water shielding sheet 10 may be damaged and not broken. Described invention). In this embodiment, the backfill soil 13 is filled between the water-impervious sheet 10 and the side of the waste 3, but it may not be filled depending on construction conditions such as the arrangement of the paper tube 11. is there.

  Next, the Example of the construction method of the foundation pile in the waste disposal site ruins which concerns on the invention described in Claim 3 and Claim 6 is demonstrated based on FIG.6 and FIG.7.

  First, similarly to Example 1 above, the pile construction position of the waste disposal site is excavated to the depth reaching the water-impervious sheet 2 while retaining with the retaining wall 5 such as a liner plate (FIG. 7 ( See A)). The substantially central portion of the water shielding sheet 2 in the bottom of the excavation hole exposed by excavation is slightly larger than the outer diameter of the guide pipe 14 in order to pass the guide pipe 14 installed on the ground 1 exposed later. Cut out into a circular shape (cut). Even in this embodiment, when the water shielding sheet 2 is cut, the surrounding waste 3 is removed, so that the pollutant does not flow out.

  It installs in the ground surface part of the ground 1 exposed through the guide pipe 14 from the hollowed hole. The guide pipe 14 is formed of a steel pipe having a height that reaches the surface layer portion of the waste 3 and has an inner diameter that is sufficient for constructing the foundation pile 4 inside.

  One end of a new water shielding sheet 15 is welded to the end of the cut water shielding sheet 2 and added. The water shielding sheet 15 is formed in a cylindrical shape having substantially the same diameter as the outer diameter of the guide pipe 14, and the height of the water shielding sheet 15 is later raised when the water shielding sheet 15 is pulled up to the upper end of the guide pipe 14. It is formed higher than the height of the guide pipe 14 so that it can be supported in a slackened state.

  With the water shielding sheet 15 slackened, the guide pipe 14 is pulled up to the upper end, and the upper end is welded and fixed to the upper end of the guide pipe 14 (see FIG. 7B). As a result, the side part of the waste 3 is covered with the earth retaining wall 5 and the water shielding sheet 15, and a structure that reliably maintains the water shielding performance is obtained.

  The foundation pile 4 is constructed inside the guide pipe 14. Even in this embodiment, since the foundation pile 4 is directly constructed on the ground 1 exposed at the bottom of the excavation hole after having a structure capable of maintaining the water shielding performance, the foundation pile 4 is not changed in any way from the usual pile construction. Can be cast in place, embedded pile, driven pile, deep pile, etc.

  The foundation pile 4 is solidified as necessary, and the backfill soil 16 such as earth and sand excellent in fillability is filled between the guide pipe 14 and the foundation pile 4 (see FIG. 7C), When the backfill soil 17 is further filled between the water shielding sheet 15 and the earth retaining wall 5, the construction of the foundation pile is completed (see FIG. 7D). The backfill soils 16 and 17 are densely filled and firmly support the foundation pile 4.

The above pile construction method also covers the inner wall of the excavation hole with the water shielding sheet 15 previously added to the water shielding sheet 2 and then constructs the foundation pile 4 directly on the exposed ground 1. Not only after construction, but also during construction, water shielding performance can be maintained, and pollutants can be permanently prevented from flowing out. In particular, since the water-impervious sheet 15 is slackened, the water-impervious sheet will not be strained and torn even if the foundation pile 4 sinks, and the outflow of contaminants can be prevented permanently.
Even if the water-impervious sheet 2 is inclined and laid, a structure capable of easily maintaining the water-impervious performance can be obtained.
As the foundation pile 4, a cast-in-place pile, an embedded pile, a driven pile, a deep pile, or the like can be adopted, and the type of pile to be constructed and the construction method of the pile are not limited.

  In the present embodiment, the earth retaining wall 5 is buried and may be removed. In that case, after filling the backfill soil 16 between the guide pipe 14 and the foundation pile 4, the guide pipe is removed while removing the liner plate and the like constituting the retaining wall 5 from the bottom of the excavation toward the ground surface. The backfilling soil 17 is filled between the exposed portion 14 and the exposed side portion of the waste 3 (invention 6). That is, the backfill soil 17 is backfilled in a process reverse to the excavation process. The removed liner plate can be reused for the construction of other foundation piles, contributing to cost reduction.

  Next, the Example of the construction method of the foundation pile in the waste disposal site ruins which concerns on invention of Claim 4 is demonstrated based on FIG.8 and FIG.9.

  First, in the same manner as in Example 2 above, the earth retaining wall 8 by a casing pipe is press-fitted to the depth before reaching the water shielding sheet 2 at the pile construction position of the waste disposal site, and the interior of the earth retaining wall 8 Is excavated (see FIG. 9A). Then, the bottom of the excavation hole is further excavated to the depth reaching the water-impervious sheet 2 while retaining with the retaining wall 9 such as a liner plate (see FIG. 9B).

  In the subsequent process, substantially the same as the third embodiment, the guide pipe 14 installed on the ground 1 exposed later is passed through the substantially central portion of the water shielding sheet 2 in the bottom of the excavation hole exposed by excavation. For this purpose, the guide pipe 14 is cut out (cut) into a circular shape having a slightly larger diameter than the outer diameter of the guide pipe 14.

  It installs in the ground surface part of the ground 1 exposed through the guide pipe 14 from the hollowed hole, and welds one end of a new water shielding sheet 15 to the end of the cut water shielding sheet 2 and adds it. With the water shielding sheet 15 slackened, the guide pipe 14 is pulled up to the upper end, and the upper end is welded and fixed to the upper end of the guide pipe 14 (see FIG. 9C). As a result, the side portion of the waste 3 is also covered with the earth retaining walls 8 and 9 and the water shielding sheet 15, so that the water shielding performance is reliably maintained.

  The foundation pile 4 is constructed inside the guide pipe 14. Even in this embodiment, since the foundation pile 4 is directly constructed on the ground 1 exposed at the bottom of the excavation hole after having a structure capable of maintaining the water shielding performance, the foundation pile 4 is not changed in any way from the usual pile construction. Can be cast in place, embedded pile, driven pile, deep pile, etc.

  The foundation pile 4 is solidified as necessary, and the backfill soil 16 such as earth and sand having excellent filling properties is filled between the guide pipe 14 and the foundation pile 4 (see FIG. 9D), Further, the backfill soil 17 is filled between the water shielding sheet 15 and the earth retaining walls 8 and 9. The backfill soils 16 and 17 are densely filled and firmly support the foundation pile 4.

  Finally, when the retaining wall 8 by the casing pipe is pulled out and removed, the construction of the foundation pile is completed (see FIG. 9E). The removed casing pipe can be reused for construction of other foundation piles, which contributes to cost reduction.

The above pile construction method also covers the inner wall of the excavation hole with the water shielding sheet 15 previously added to the water shielding sheet 2 and then constructs the foundation pile 4 directly on the exposed ground 1. Not only after construction, but also during construction, water shielding performance can be maintained, and pollutants can be permanently prevented from flowing out. In particular, since the water-impervious sheet 15 is slackened, the water-impervious sheet will not be strained and torn even if the foundation pile 4 sinks, and the outflow of contaminants can be prevented permanently.
Even if the water-impervious sheet 2 is inclined and laid, a structure capable of easily maintaining the water-impervious performance can be obtained.
As the foundation pile 4, a cast-in-place pile, an embedded pile, a driven pile, a deep pile, or the like can be adopted, and the type of pile to be constructed and the construction method of the pile are not limited.

It is the conceptual diagram which showed Example 1 of the construction method of the foundation pile in the waste disposal site ruins which concerns on this invention. FIG. 3 shows a process diagram of Example 1. FIG. FIG. 3 shows a process diagram of Example 1. FIG. FIG. 3 shows a process diagram of Example 1. FIG. It is the conceptual diagram which showed Example 2 of the construction method of the foundation pile in the waste disposal site ruins which concerns on this invention. The process drawing of Example 2 is shown. The process drawing of Example 2 is shown. The process drawing of Example 2 is shown. The process drawing of Example 2 is shown. The process drawing of Example 2 is shown. It is a horizontal sectional view of Drawing 4 (E). It is the conceptual diagram which showed Example 3 of the construction method of the foundation pile in the waste disposal site ruins which concerns on this invention. FIG. 9 shows a process diagram of Example 3. FIG. FIG. 9 shows a process diagram of Example 3. FIG. FIG. 9 shows a process diagram of Example 3. FIG. FIG. 9 shows a process diagram of Example 3. FIG. It is the conceptual diagram which showed Example 4 of the construction method of the foundation pile in the waste disposal site ruins which concerns on this invention. FIG. 9 shows a process diagram of Example 4. FIG. FIG. 9 shows a process diagram of Example 4. FIG. FIG. 9 shows a process diagram of Example 4. FIG. FIG. 9 shows a process diagram of Example 4. FIG. FIG. 9 shows a process diagram of Example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Water shielding sheet 3 Waste 4 Foundation pile 5 Earth retaining wall by liner plate, etc. 6, 10, 15 New water shielding sheet 7 Backfill soil 8 Earth retaining wall by casing pipe 9 Earth retaining wall by liner plate 11 Paper tube 12, 13 Backfill soil 14 Guide pipe 16, 17 Backfill soil

Claims (6)

A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth reaching the water-impervious sheet while retaining it with a retaining wall such as a liner plate,
Cut the impermeable sheet in the bottom of the excavation, weld a new impermeable sheet that reaches the surface layer of the waste, and add it to the end of the excavated bottom, and loosen the impermeable sheet to the inner wall of the retaining wall. Along the process of pulling up to the surface layer of waste along the cylinder and supporting its upper end,
A method for constructing a foundation pile at a site of a waste disposal site, comprising the step of constructing a foundation pile inside the waterproof sheet and filling backfill soil between the waterproof sheet and the foundation pile . A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth just before reaching the water shielding sheet while retaining with the retaining wall by the casing pipe,
A step of excavating the excavation bottom while further retaining the soil with a retaining wall such as a liner plate to a depth reaching the water shielding sheet;
Cut the impermeable sheet in the bottom of the excavation, weld a new impermeable sheet that reaches the surface layer of the waste, and add it to the end of the excavated bottom, and loosen the impermeable sheet to the inner wall of the retaining wall. Along the cylinder, pulling it up to the surface of the waste, and supporting the upper end thereof,
The construction comprises a step of constructing a foundation pile inside the water shielding sheet, filling backfill soil between the water shielding sheet and the foundation pile, and removing a retaining wall by a casing pipe. Construction method for foundation piles at the site of the landfill site. A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth reaching the water-impervious sheet while retaining it with a retaining wall such as a liner plate,
Cutting the water-impervious sheet in the bottom of the excavation and installing a guide pipe having a height reaching the surface layer of waste on the exposed ground;
A step of welding a new water-impervious sheet to the end of the cut water-impervious sheet and adding it, and pulling it up to the upper end of the guide pipe in a loosened state, supporting the upper end,
The foundation in the site of the waste disposal site, comprising the step of constructing the foundation pile inside the guide pipe and filling the backfill soil between the guide pipe and the foundation pile and between the retaining walls How to build a pile. A method of constructing foundation piles to utilize the waste disposal site,
Excavating the pile construction position of the site of the waste disposal site to the depth just before reaching the water shielding sheet while retaining with the retaining wall by the casing pipe,
A step of excavating the excavation bottom while further retaining the soil with a retaining wall such as a liner plate to a depth reaching the water shielding sheet;
Cutting the water-impervious sheet in the bottom of the excavation and installing a guide pipe having a height reaching the surface layer of waste on the exposed ground;
A step of welding a new water-impervious sheet to the end of the cut water-impervious sheet and adding it, and pulling it up to the upper end of the guide pipe in a loosened state, supporting the upper end,
It consists of the steps of constructing a foundation pile inside the guide pipe, filling backfill soil between the guide pipe and foundation pile and between the retaining walls, and removing the retaining wall by the casing pipe. The construction method of the foundation pile in the waste disposal site ruins.   The waste according to claim 2, wherein a friction is reduced by providing a gap with a paper tube or the like between the raised water-impervious sheet and the casing pipe, or a friction reducing material such as a lubricant is applied. Construction method for foundation piles at the site of the landfill site. When using a liner plate or the like as a retaining wall, after filling the backfill soil between the guide pipe and the foundation pile, remove the liner plate etc. from the bottom of the excavation toward the ground surface. 4. The method for constructing a foundation pile in a waste disposal site according to claim 3, wherein backfilling soil is filled between the pipe and the exposed side of the waste.

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