JP2006183322A - Method of testing vertical load on existing pile at depth lower than groundwater level - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of testing a vertical load on an existing pile which measures a bearing force the an upper end of the existing pile and the peripheral surface friction of the same at a depth lower than a groundwater level under existing conditions or conditions after reusing, to thereby evaluate the suitable bearing performance of the pile. <P>SOLUTION: A pile head is edge-trimmed form a foundation member at the pile head peripheral location of the foundation member which involves the pile head of the existing pile to be tested, or at a neighboring location separated from the pile head peripheral location except for the lower end of the foundation member. Then a vertically slidable joint member is set in a recess or on a cut area formed by the edge trimming for water cutoff finishing, and a loading testing device is built up at the upper end of the existing pile, and a vertical load is applied to the existing pile. Herein, residuals of the foundation member adhering to the pile are firstly broken, and then the bearing performance of the existing pile is measured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention is a vertical loading test method for existing piles to confirm whether the existing pile used in the existing building can be reused as a pile in a new building, and to check the support performance of the pile. In the following technical field, it is appropriate to measure the tip support force and peripheral frictional force of existing piles deeper than the groundwater level in the existing state or in a reused state. The present invention relates to a vertical loading test method for existing piles that can be evaluated for proper support performance.

  Conventionally, when rebuilding a building, the existing pile used in the existing building is reused as a pile of a new building to shorten the construction period, reduce the cost, reduce the environmental load, and the like. At this time, a vertical loading test is carried out on the existing pile, and the existing pile with useful value is reused by confirming the support performance and comprehensive soundness of the existing pile such as tip support force and peripheral friction force. Evaluate whether or not. For example, the following techniques are known as vertical loading test methods for existing piles.

  In “Building Building Method Using Existing Pile” of Patent Document 1, the head of a predetermined existing pile (existing pile) in an existing building is cut at a predetermined height to be cut off from the foundation slab, and the edge cut. A technique is disclosed in which a jack is installed between a foundation slab and an existing pile, and a vertical load test is performed on the existing pile by taking a reaction force on the foundation slab.

In the “utilization method of existing cast-in-place concrete pile” of Patent Document 2, after dismantling the existing building and excavating the ground to the head of the existing pile, a through-hole in the length direction of the existing pile is drilled, Drill holes to the ground below the pile. A technique is disclosed in which a removable anchor is inserted into the through-hole and fixed in the ground under the pile, and the anchor bar is tensioned to perform a vertical loading test of the existing pile.
Japanese Patent Laid-Open No. 11-264247 Japanese Patent No. 2851537

  However, the vertical loading test of the existing piles of Patent Document 1 and Patent Document 2 has the following problems. That is, in these inventions, the depth position where the loading test is carried out is carried out at or above the groundwater level, and there is no description of any countermeasures for cases where the depth is below the groundwater level. In the case of deeper than the groundwater level, it is necessary to continuously perform the work of pumping up the spring water using a submersible pump or the like during assembly of the loading device and during the loading test. Therefore, it is very troublesome and time-consuming, and costs increase. In addition, since the flow of spring water is generated around the existing pile, the tip support force and peripheral friction force of the existing pile are measured smaller than the actual one, and the support performance cannot be evaluated appropriately. In particular, for Patent Document 2, since the ground is excavated to the head of the existing pile, there is a possibility that the test apparatus will be immersed in the groundwater and the equipment or the like may be damaged.

  In order to prevent the flow of the spring water, a method of using existing retaining walls, connecting walls, etc., or constructing a retaining water retaining wall prior to the loading test, pumping water using a deep well or well point, etc. A method for securing dry work at the test site is conceivable. However, these methods are not only very time-consuming and time-consuming, but also the load test is performed after the ground surface of the pile is compacted. As a result, the support performance may not be properly evaluated.

  Patent Documents 1 and 2 are procedures for performing a vertical loading test after dismantling an existing building or excavating the ground to the head of an existing pile. For this reason, it takes time to grasp the support performance such as the tip support force and the peripheral friction force of the existing pile and the overall soundness, and there is a problem that the construction period is prolonged in the design process. In addition, when the water level is deeper than the groundwater level, the problem becomes serious because excavation of the pumping well and pumping work are added.

  The purpose of the present invention is to prevent the occurrence of spring water around the existing pile when the loading position of the existing pile is deeper than the groundwater level, and to improve the vertical support performance (tip support force and peripheral friction force) of the existing pile. To provide a vertical loading test method for existing piles deeper than the groundwater level that can be measured in an existing state or reused, can be implemented with an inexpensive and simple structure, and can shorten the construction period by conducting a loading test in advance. is there.

As a means for solving the above-mentioned problems of the prior art, a vertical loading test method for existing piles at a depth below the groundwater level according to the invention described in claim 1 is:
A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of performing a water stop treatment by installing a joint member that is slidable in the vertical direction in the recess or cut formed by the edge cutting; and
A loading test device is assembled to the upper end portion of the existing pile, a vertical load is applied to the existing pile, and the remaining portion of the foundation member is first broken to measure the support performance of the existing pile.

Invention of Claim 2 is the vertical loading test method of the existing pile in the depth below the groundwater level described in Claim 1,
A cylinder that closes the recess or cut opening formed by edge cutting is installed on the inner peripheral side of the recess or cut, and a cover member that wraps closely with the cylinder is installed on the outer periphery of the recess or cut. It is characterized by that.

Invention of Claim 3 is the vertical loading test method of the existing pile in the depth below the groundwater level described in Claim 1 or 2,
A water-stopping auxiliary material such as a water-expandable rubber, a viscous rubber, or a waste is filled in the lap surface of the cylinder and the cover member, or in the concave portion or the cut end.

The vertical loading test method for existing piles at a depth below groundwater according to the invention described in claim 4 is:
A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of refilling the coring material collected by edge cutting back into the recess or cut and performing a water stop treatment,
A loading test device is assembled to the upper end portion of the existing pile, a vertical load is applied to the existing pile, and the remaining portion of the foundation member is first broken to measure the support performance of the existing pile.

The vertical loading test method for existing piles at a depth below groundwater according to the invention described in claim 5 is:
A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of closely fitting the molded member into the recess or cut formed by edge cutting and performing a water stop treatment,
A loading test device is assembled to the upper end portion of the existing pile, a vertical load is applied to the existing pile, and the remaining portion of the foundation member is first broken to measure the support performance of the existing pile.

The vertical loading test method for existing piles at a depth below the groundwater level according to the invention described in claim 6 is:
A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
Filling the recess or cut formed by the edge cutting with an amorphous backfill material such as mortar and performing a water stop treatment;
A loading test device is assembled to the upper end portion of the existing pile, a vertical load is applied to the existing pile, and the remaining portion of the foundation member is first broken to measure the support performance of the existing pile.

The vertical loading test method for existing piles at deeper than the groundwater level according to the invention described in claim 7,
A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A water blocking wall is raised on the outer peripheral wall of the recess or cut formed by edge cutting or along the outer peripheral wall and the inner peripheral wall, and a partition material for vertically partitioning the space surrounded by the water blocking wall is placed on the outer wall. A step of filling the heavy mud water above the partition material in the station and performing a water stop treatment;
A loading test device is assembled to the upper end portion of the existing pile, a vertical load is applied to the existing pile, and the remaining portion of the foundation member is first broken to measure the support performance of the existing pile.

Invention of Claim 8 is the vertical loading test method of the existing pile in the depth below the groundwater level as described in any one of Claims 1-7,
The step of edging leaving a part of the lower end of the foundation member includes edging leaving the thickness of all or part of the discarded concrete portion located below the foundation member.

Since the vertical loading test method for existing piles deeper than the groundwater level according to the present invention has a structure in which a recessed portion or cut edge is cut off while leaving a part of the lower end portion of the foundation member, the following effects are produced.
(1) It is possible to prevent the flow of spring water from occurring around the existing pile 2 and to eliminate the factors of lowering the tip support force and the peripheral friction force. However, it is possible to accurately determine whether or not to reuse by measuring the peripheral frictional force of the existing pile in the existing state or in a reused state, appropriately evaluating the support performance.
(2) Since water does not reach the loading position, it is possible to prevent a problem that the loading device 9 such as the jack 91 is immersed in the water, resulting in equipment failure.
(3) Since the loading test can be performed in advance without waiting for the dismantling work of the existing building 1 and without performing the pumping work, the entire construction period can be shortened by ensuring the design process.

The edge of the pile head and the foundation member 3 is cut off at the outer peripheral position of the pile head in the foundation member 3 including the pile head of the existing pile 2a to be tested or in the vicinity of the outer circumference of the pile head. This is done with some parts left.
A joint member 5 slidable in the vertical direction is installed in the concave portion 4 (or the cut edge 4) formed by the edge cutting, and the water is stopped.
The loading test apparatus 9 is assembled to the upper end portion of the existing pile 2a, a vertical load is applied, the remaining portion S of the foundation member is broken, and the support performance of the existing pile 2a is measured.

  Embodiments of the present invention will be described with reference to the drawings. The loading test method of the present invention confirms whether the existing pile 2 deeper than the groundwater level used in the existing building 1 can be reused when the building is rebuilt, by confirming the supporting performance of the existing pile 2a to be tested. To be implemented.

First, as shown in FIG. 1, the pile head and the foundation member at a position slightly apart from the outer peripheral position of the pile head in the foundation member 3 including the pile head of the existing pile 2 a located deeper than the groundwater level to be tested. Cut 3 edges. The base member 3 in the illustrated example is configured as a mat slab 3a or a pressure plate 3a.
Specifically, a test pile 2a to be tested (hereinafter simply referred to as an existing pile 2a) is selected from a plurality of existing piles 2... Perform pipe coring and trim. At this time, coring is performed so that the remaining portion S is formed while leaving a part of the lower end portion of the base member 3. This is to prevent the problem that the groundwater existing immediately below the foundation member 3 (or the remaining portion S) springs up.

  The edge cutting location is not limited to the illustrated example, but may be performed along the outer peripheral position of the pile head. Further, the edge cutting method is not limited to the coring, and a method of cutting with a concrete cutter may be used. A concrete may be used for the concrete.

When the foundation member 3 has a footing 3b (or foundation beam 3b), as shown in FIG. 2, the edge cutting is usually performed at a position slightly away from the outer peripheral position of the footing 3b. The position along the outer peripheral surface of the film may be trimmed.
In short, in the case of the present invention, the edge cutting can be performed with an appropriate correspondence without being affected by the structure of the base member 3.

  Moreover, as shown in FIG. 3A, the base member 3 is positioned on the lower side of the base member 3 as a means for cutting out the edge while leaving a part of the lower end of the base member 3 (including both the mat slab 3a and the footing 3b). The entire thickness of the discarded concrete is left by cutting up to the upper surface of the discarded concrete 3c. Further, as shown in FIG. 3B, the material may be cut into the discarded concrete 3c so as to leave a part (lower end) of the thickness (the invention according to claim 8). In the illustrated example, the case where the discarded concrete 3c is provided is shown. Of course, even in a foundation member that does not have the discarded concrete 3c, edge cutting is performed while leaving a part of the lower end portion of the foundation member.

Next, a means for performing a water stop treatment by installing a joint member 5 slidable in the vertical direction in the recess 4 formed by the above-described edge cutting (hereinafter, including a cut end 4 by a concrete cutter) will be described.
First, FIG. 4 shows an example in which the joint member 5 is installed in the recess 4 of the base member 3 having the footing 3b.
That is, a cylinder 50 having a flange 50a that closes the opening of the recess 4 is fixed to the inner peripheral side (the outer peripheral surface of the footing 3b) of the recess 4 with the bolt 6, and the cylinder 50 and the flange 50a are installed. A cover member 51 that wraps closely with the upper surface of the concave portion 4 is fixedly installed on the outer peripheral side of the concave portion 4 with a bolt 6 via a base member 3 and a base plate 51a. Since the cylindrical body 50 and the flange 50a slide together with the existing pile 2a at the time of a loading test, the lap surface between the cylindrical body 50 and the flange 50a and the cover member 51 is filled with the water-stop auxiliary material 7 and water-stopped. Things are also done. Of course, it can also be carried out by filling the recessed portion 4 with the water stop aid 7. As the water stop auxiliary material 7, for example, water expansion rubber, viscous rubber, urethane, waste cloth, sandbag, etc. are preferably used (invention according to claim 3).

  In the case where the base member 3 has a mat slab 3a (or pressure platen 3a), for example, as shown in FIGS. 1 and 5, first, a base 90 is installed on the upper end (mat slab 3a) of the test pile 2a. The Then, a plurality of support bases 8 rising along the outer peripheral side of the pedestal 90 are installed. The cylindrical body 50 is fixed and installed by the outer peripheral surface of the support base 8 and the bolt 6. A cover member 51 that closely wraps on the upper surface of the cylindrical body 50 and the flange 50a is fixed by a bolt 6 via a base member 3 (mat slab 3a) and a base plate 51a, and the joint member 5 is installed. Of course, the present invention is not limited to the illustrated embodiment, and a slidable joint member without the flange 50a may be used.

  Thereafter, as shown in FIG. 1 or FIG. 2, a jack 91 that takes a reaction force on the adjacent existing building frame is applied to the upper end of the existing pile 2a, specifically on the pedestal 90 or on the footing 3b. The load test apparatus 9 including the assembly is assembled, a test load is applied to the existing pile 2a by the jack 91, and the remaining portion S of the foundation member 3 is first broken to measure the support performance. The loading test apparatus 9 can be implemented by any method such as a method using a reaction force pile and a loading girder, a method using a building load, or another rapid loading test method, not the method using the jack 91. . Incidentally, the above-described vertical loading test method can be performed at the earliest stage without waiting for the dismantling work of the existing building 1 and without pumping the groundwater.

  When the remaining portion S breaks, groundwater is attracted, but the joint member 5 slidable in the vertical direction stops the groundwater squirt and does not reach the loading surface, and the flow of spring water flows around the existing pile. It also prevents it from occurring. This situation can be regarded as the same as the situation where the existing piles are reused (existing state).

  Therefore, it is possible to accurately evaluate whether or not the tip support force and peripheral friction force of the existing pile are measured and reused in the existing state or reused, and the loading device such as a jack is immersed in water. It is possible to prevent a problem that causes a failure of the device. Furthermore, since it is not necessary to perform the pumping work without waiting for the dismantling work of the existing building 1, the loading test can be performed at the earliest stage, and the entire construction period can be ensured by ensuring the design process. It can be shortened.

  Thereafter, the existing building 1 is dismantled and the existing pile 2a whose supporting performance is confirmed is reused as a pile of a new building. At this time, when the supportability of the existing pile is small with respect to the new building load, the support performance may be ensured by driving an additional pile.

  Next, a vertical loading test method for existing piles at a depth below the groundwater level according to the invention described in claim 4 will be described with reference to FIG. Hereinafter, the second to sixth embodiments are based on the technical idea substantially the same as that of the first embodiment, and the differences will be mainly described below. The base member 3 having the footing 3b will be described as an example. Of course, the base member 3 having the mat slab 3a can be implemented by the same method as described above. It is mentioned in advance that the method described in the above can be implemented.

  In the water stop treatment of Example 2, the water stop treatment is performed by refilling the coring material 30 collected when the recess 4 is formed by edge cutting by coring into the recess 4 again. Moreover, it is preferable to apply the friction cut material 10 to one side surface of the coring material 30. FIG. 6 shows an example in which the coating is applied to the inner peripheral surface (footing 3b side). Grease may be applied instead of the friction cut material 10. In the case of the embodiment of the present invention, the groundwater is attracted when the remaining portion S breaks, but the coring material 30 slides and fills the remaining portion S sequentially with the settlement of the existing pile 2a, and the groundwater spouts up. To prevent the occurrence of spring water flow around the existing pile.

A vertical loading test method for existing piles at a depth below the groundwater level according to the invention described in claim 5 will be described with reference to FIG.
That is, after the edge cutting, the molded member 11 is closely fitted into the recess 4 formed by the edge cutting, and a water stop treatment is performed. In the present embodiment as well, the friction cut material 10 is preferably applied to one side surface of the molded article 11 in the same manner as the second embodiment. FIG. 7 shows a case where it is applied to the inner peripheral surface (footing 3b side). Also in the case of the embodiment of the present invention, when the remaining portion S is broken, the molding member 11 slides and fills the remaining portion S sequentially as the existing pile 2a sinks to stop the spraying of groundwater.

  A vertical loading test method for existing piles at a depth below the groundwater level according to the invention described in claim 6 will be described with reference to FIG. In the water stop treatment of Example 2 and Example 3 described above, the method of filling the concave portion 4 with the coring material 30 or the molding member 11 has been described. However, in the present Example 4, the concave portion 4 formed by edge cutting has a mortar or the like. The amorphous backfill material 12 is filled and water-stopped. Also in this case, it is preferable to apply the friction cut material 10 to one side surface of the recess 4. FIG. 8 shows the case where it is applied to the inner peripheral surface of the recess 4 (or the outer peripheral surface of the footing 3b). The amorphous backfill material 12 is mortar, concrete, urethane, water expansion rubber, or the like.

  If mortar or concrete is used as the irregular backfill material 12, it is necessary to consider the problem that adhesion (adhesion) of the base member 3 to the outer peripheral surface of the footing 3b becomes resistance to settlement during the loading test. is there. Therefore, as shown in FIG. 9, it is preferable to place a cushioning material 13 on one side surface of the recessed portion 4 that has been edge-cut, and then, to fill the recessed portion 4 with the irregular backfill material 12. FIG. 9 shows a case where the cushioning material 13 is installed on the inner peripheral surface of the recess 4 (or the outer peripheral surface of the footing 3b). Of course, the molded article 11 may be filled in place of the irregular backfill material 12. Also in the case of the embodiment of the present invention, the spraying of groundwater is stopped by the irregular backfill 12 or the like that can slide in the vertical direction.

  A vertical loading test method for existing piles at a depth deeper than groundwater according to the invention of claim 7 will be described with reference to FIG. The sixth embodiment is also based on substantially the same technical idea as the first embodiment, and the difference will be mainly described below. The sixth embodiment is preferably carried out when it is confirmed that the groundwater level is not so high, and the gist is balanced with the pressure received by the remaining portion S of the foundation member 3 breaking during the loading test. Heavy mud water 18 is provided, and the pressure of the same mud water 18 is applied to the bottom of the recess 4 to prevent the spring water from flowing.

Specifically, the water blocking wall 14 is raised along the outer peripheral wall of the recess 4 formed by edge cutting. Specifically, the water blocking wall 14 is installed by a bolt 15 via the base member 3 and the base plate 14a. After that, a partition material 17 for vertically partitioning the space 16 surrounded by the water blocking wall 14 is placed, and the heavy mud water 18 is filled up to a certain level H above the partition material 17 in the space 16. Stop water treatment. The partition member 17 separates the heavy mud water 18 from the ground water that springs out when the remaining portion S of the foundation member 3 breaks during a loading test. The partition material 17 has a lower specific gravity than the heavy mud water 18. The effect which prevents moving to the upper layer of the muddy water 17 is exhibited.
Therefore, the pressure of the heavy mud water 18 can always be pressurized to the groundwater, and the flow of the groundwater spring can be prevented.
In the illustrated example, the concave portion 4 is provided along the outer peripheral position of the footing 3b of the base member 3. However, when the concave portion is provided near the outer peripheral position of the footing 3b, or the base member 3 is mat slab 3a. In this case, the two types of water blocking walls 14 and 14 rising along the outer peripheral wall and the inner peripheral wall of the recess 4 are raised to form a void 16.

  In addition, although the Example of this invention was described above, this invention is not limited to such an Example at all, In the range which does not deviate from the summary of this invention, it can implement with a various form. For example, the joint member 5 of Example 1 and the water stop treatment method of any of Examples 2 to 5 can be used in combination.

It is the elevation which showed notionally the vertical loading test method of the existing pile which can be deeper than the groundwater level when the foundation member is a pressure plate or a mat slab. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level in the case where the foundation member has a structure having a foundation beam and a footing. A and B are the figures which showed the other Example which cuts out a margin, leaving a part of lower end part of a base member. It is the figure which showed an example which installed the joint member which can be slid to an up-down direction. It is the figure which showed an example which installed the joint member which can be slid to an up-down direction. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level of Example 2. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level of Example 3. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level of Example 4. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level of Example 5. It is the elevation which showed notionally the vertical loading test method of the existing pile in deeper than the groundwater level of Example 6.

Explanation of symbols

1 Existing building 2 Existing pile 2a Existing pile to be tested (test pile)
DESCRIPTION OF SYMBOLS 3 Base member 30 Coring material 4 Concave part 5 Water stop joint 50 Cylindrical body 50a Flange 51 Cover member 6 Bolt 7 Water stop auxiliary material 9 Loading test apparatus 90 Jack 10 Friction cut material 11 Molding member 12 Amorphous backfill material 13 Buffer material 14 Water blocking wall 16 Empty space 17 Partition material 18 Heavy mud water

Claims (8)

A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of performing a water stop treatment by installing a joint member that is slidable in the vertical direction in the recess or cut formed by the edge cutting; and
Assembling a loading test device to the upper end of the existing pile, applying a vertical load to the existing pile, first measuring the support performance of the existing pile by breaking the remaining portion of the foundation member, Test method for vertical loading of existing piles.   A cylinder that closes the recess or cut opening formed by edge cutting is installed on the inner peripheral side of the recess or cut, and a cover member that wraps closely with the cylinder is installed on the outer periphery of the recess or cut. The vertical loading test method for existing piles at a depth deeper than the groundwater level according to claim 1.   The groundwater according to claim 1 or 2, wherein a water-stopping auxiliary material such as a water expansion rubber, a viscous rubber, or a waste is filled in the lap surface of the cylindrical body and the cover member, or in the recess or the cut end. Vertical loading test method for existing piles at a deeper depth. A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of refilling the coring material collected by edge cutting back into the recess or cut and performing a water stop treatment,
At the upper end of the existing pile, a loading test device is assembled, a vertical load is applied to the existing pile, and the remaining part of the foundation member is first broken to measure the support performance of the existing pile. Vertical loading test method for existing piles. A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A step of closely fitting the molded member into the recess or cut formed by edge cutting and performing a water stop treatment,
At the upper end of the existing pile, a loading test device is assembled, a vertical load is applied to the existing pile, and the remaining part of the foundation member is first broken to measure the support performance of the existing pile. Vertical loading test method for existing piles. A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
Filling the recess or cut formed by the edge cutting with an amorphous backfill material such as mortar and performing a water stop treatment;
Assembling a loading test device to the upper end of the existing pile, applying a vertical load to the existing pile, first measuring the support performance of the existing pile by breaking the remaining portion of the foundation member, Test method for vertical loading of existing piles. A vertical loading test method for reusing existing piles used in an existing building when rebuilding a building,
The edge of the pile head and the foundation member at the outer peripheral position of the pile head or in the vicinity away from the outer circumference of the pile head in the foundation member including the pile head of the existing pile to be tested, and part of the lower end of the foundation member The remaining steps,
A water blocking wall is raised on the outer peripheral wall of the recess or cut formed by edge cutting or along the outer peripheral wall and the inner peripheral wall, and a partition material for vertically partitioning the space surrounded by the water blocking wall is placed on the outer wall. A step of filling the heavy mud water above the partition material in the station and performing a water stop treatment;
Assembling a loading test device to the upper end of the existing pile, applying a vertical load to the existing pile, first measuring the support performance of the existing pile by breaking the remaining portion of the foundation member, Test method for vertical loading of existing piles.   The step of cutting out the edge of the foundation member by leaving a part thereof includes cutting out the edge of the part of the discarded concrete part located below the foundation member by leaving the thickness of the part. The vertical loading test method of the existing pile in the depth below the groundwater level described in any one of 1-7.

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