JP7154076B2 - Continuous wall and its construction method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous wall installed underground for the purpose of stopping water, retaining earth, etc., and a construction method thereof.

Conventionally, when seismically reinforcing a bridge installed over a river, for example, a cutoff wall is sometimes constructed in order to close off the periphery of the bridge piers. As an example of a water cutoff wall construction method, after a plurality of main piles (steel pipe piles) are press-fitted at predetermined intervals, inter-pile pipes, which are small-diameter steel pipe piles, are pressed into the adjacent main piles in close proximity to each other. , a technique of filling a hardened material (cement milk, mortar, cement, etc.) in the inter-pile region surrounded by the main pile and the inter-pile pipe. It is also known that a similar technique is used to construct a retaining wall when retaining it by constructing a predetermined retaining wall on the ground or the like.

For example, in the technique represented by Patent Document 1, small-diameter pipes are constructed so as to sandwich steel pipe piles, and the space between these small-diameter pipes is excavated using techniques such as high-pressure water, down-the-hole hammers, and small-diameter augers. A hardened material is put into the closed space to stop water and retain earth.

In addition, Patent Document 2 and Patent Document 3 disclose techniques for reliably blocking water and retaining earth by blocking adjacent members (steel pipe piles) with high accuracy when constructing a continuous wall. In Patent Literature 2, an elastic sealing material and an auxiliary member are arranged to block the space between adjacent steel pipe piles, and water stoppage or earth retention is reliably performed. In Patent Document 3, a hollow cylindrical elastic body is embedded in a gap between members (steel pipe piles, etc.), and a filling material is pressure-filled into the hollow part of the cylindrical elastic body to expand the diameter and deform so that the adjacent It is configured such that it is tightly closed between the members.

JP-A-5-112928 JP-A-2005-155303 JP 2013-76313 A

However, in the continuous wall described in Patent Document 1, if one side is drained or excavated during water stoppage or earth retention, the balance of water pressure and earth pressure is lost, and the steel pipe pile and hardened material may be bent or deformed. be. Hardened materials such as cement milk and mortar cannot follow the deflection and deformation, and cracks may occur, resulting in water leakage and soil leakage.

In addition, in the technique described in Patent Document 2, if one side is drained or excavated at the time of stopping water or retaining earth, the balance of water pressure and earth pressure will be lost, and depending on the dimensions and arrangement of the elastic seal material and auxiliary members, the steel pipe pile will be bent.・It may not be able to follow the deformation. In addition, in the technique described in Patent Document 3, when the tubular elastic body is pressurized and filled with the filler, there is no member for supporting the tubular elastic body. There is a risk that expansion deformation will occur, and sufficient blockage (water stoppage / earth retention) will not be performed. That is, with the techniques described in Patent Documents 2 and 3, there is a risk that the blockage (water stoppage/earth retaining) may not be sufficiently performed depending on the balance of water pressure and earth pressure applied to the continuous wall, and there is room for further improvement. rice field.

In view of the above circumstances, the object of the present invention is to provide a continuous wall made of steel pipe piles installed for the purpose of water stoppage, earth retention, etc., in the case where the steel pipe piles are displaced according to the balance of water pressure and earth pressure. Another object of the present invention is to provide a continuous wall made of steel pipe piles capable of achieving sufficient water cutoff and earth retaining, and a construction method thereof.

In order to achieve the above object, according to the present invention, between a plurality of piles installed at predetermined intervals, only on one side of the position where the gap between the piles is closed A continuous wall in which pipes between piles are installed so as to abut on the main piles, wherein a hollow elastic body that is elastically deformable in diameter is installed in a gap between the main piles, The inner space of the elastic body is filled with water or a hardened material under pressure, and the elastic body expands and deforms, so that at least a part of the elastic body is formed between the two adjacent main piles and the inter-pile pipe. A continuous wall is provided which is characterized by being pushed all the way into a tight fit .

In addition, according to the present invention, between a plurality of piles installed at a predetermined interval, only one side of the position at which the gap between the piles is closed so as to contact the pile A pile-to-pile pipe installed in the pile-to-pile pipe, an elastic body that adheres to the peripheral surface of the pile so as to block the gap between the piles , and is injected into the pile-to-pile pipe to close the pile-to-pile pipe. and a hardened material supplied to a position where the gaps between the piles are closed by pulling out the piles, wherein the elastic body is hollow and elastically expandable and deformable in diameter. , along with the reduction of the internal space volume of the elastic body, the hardened material solidifies in a state where the elastic body is pressed against the peripheral surface of the main pile, so that it follows and adheres to the peripheral surface of the main pile. A continuous wall is provided, characterized in that it is configured to be

In addition, according to the present invention, between a plurality of piles installed at a predetermined interval, only one side of the position at which the gap between the piles is closed so as to contact the pile A pile-to-pile pipe installed in the pile-to-pile pipe, an elastic body that adheres to the peripheral surface of the pile so as to block the gap between the piles , and is injected into the pile-to-pile pipe to close the pile-to-pile pipe. and a hardened material supplied to a position where the gap between the piles is closed by pulling out, wherein the hardened material is in a state where the elastic body is pressed against the peripheral surface of the pile. A continuous wall is provided, characterized in that it is configured to follow and adhere to the peripheral surface of the main pile by solidifying the material.

Further, according to the present invention from another aspect, there is provided a construction method for constructing a continuous wall as described above, wherein a plurality of main piles are installed at predetermined intervals, and the gaps between the main piles Install the inter-pile pipe so as to contact the main pile only on one side of the position to block the pile, excavate and wash the predetermined space surrounded by the main pile and the inter-pile pipe, excavate and wash At least part of the elastic body is deformed by expanding the diameter of the elastic body by placing the elastic body in the predetermined space and filling the internal space of the elastic body with water or a hardened material under pressure. is pressed against all of the adjacent two main piles and the inter-pile pipe, and a continuous wall is constructed so as to be in close contact with each other.

Further, according to the present invention, in the construction method for constructing the continuous wall described above, a plurality of main piles are installed at predetermined intervals, and the gap between the main piles is closed . A pipe between piles is installed so as to contact the main pile only on one side, and a predetermined space surrounded by the main pile and the pipe between piles is excavated and washed, and the predetermined space that has been excavated and washed The elastic body is installed in the space, the internal space of the elastic body is filled with water, the hardened fluid is injected into the pipe between piles, and the water in the internal space of the elastic body is filled. There is provided a construction method characterized by removing, pulling out the inter-pile pipe, and solidifying the hardened material while pressing the elastic body against the peripheral surface of the main pile.

Further, according to the present invention, in the construction method for constructing the continuous wall described above, a plurality of main piles are installed at predetermined intervals, and the gap between the main piles is closed . A pipe between piles is installed so as to contact the main pile only on one side, and a predetermined space surrounded by the main pile and the pipe between piles is excavated and washed, and the predetermined space that has been excavated and washed The elastic body is installed in the space, and a fluid hardened material is pressurized into the inter-pile pipe, and the inter-pile pipe is pulled out, and the elastic body is pressed against the peripheral surface of the main pile. A construction method is provided, characterized in that the cured product is solidified.

According to the present invention, in a continuous wall made of steel pipe piles installed for the purpose of water stoppage, earth retention, etc., even if the steel pipe piles are displaced according to the balance of water pressure and earth pressure, sufficient stopping can be achieved. It becomes possible to realize water and earth retention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of schematic structure of the pile press-in machine which concerns on embodiment of this invention. FIG. 3 is a schematic cross-sectional plan view showing an overview of press-fitting of the main pile and the inter-pile pipe. It is a schematic explanatory drawing regarding the excavation cleaning in the clearance gap between this pile. It is a schematic plane cross-sectional view when an elastic body is inserted into the gap. FIG. 4 is a schematic explanatory diagram showing an example of a configuration of an elastic body; It is a schematic explanatory drawing regarding temporary construction. It is a schematic explanatory drawing regarding permanent construction.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

(Schematic configuration of pile press-in machine)
FIG. 1 is a diagram showing an example of a schematic configuration of a pile press-in machine 10 according to an embodiment of the present invention. The pile press-in machine 10 shown in FIG. 1 shows a case where the pile 2 is rotationally press-fitted into the ground. The pile press-in machine 10 has a configuration in which the main pile 2 is lowered by the operation of the main cylinder 11 and rotationally press-fitted while the main pile 2 is gripped and rotated by the chuck portion 17 .

As shown in FIG. 1, the pile press-in machine 10 grasps the upper end side of the existing main pile 2 that has been press-fitted into the ground and takes reaction force from the existing main pile 2. The main pile 2 is gripped by the chuck part 17 and lowered, and a new main pile 2 is press-fitted into the ground. In addition, the pile press-in machine 10 can press-in and insert various members (for example, an inter-pile pipe 3 described below) between the main piles 2 . A desired member can be press-fitted/inserted by appropriately using another member as the member to be gripped by the chuck portion 17 . Prior excavation may be performed when inserting the member.

In the present invention, for example, with the pile press-in machine 10 as described above, construction is performed using the main pile 2 and the inter-pile pipe 3 having a smaller diameter than the main pile 2, and the continuous wall 1 (water stop wall, It is a technology related to the case of installing an earth retaining wall. Hereinafter, a continuous wall and a construction method thereof according to an embodiment of the present invention will be described by exemplifying a case where the main pile 2 and the inter-pile pipe 3 are used.

In this specification, the main pile 2 and the inter-pile pipe 3 may be collectively referred to as a "steel pipe pile". In addition, when the steel pipe piles such as the main pile 2 and the inter-pile pipe 3 “contact” or “contact” each other, in addition to the case where each member such as the main pile 2 and the pile pipe 3 directly contact, the main pile 2 and the inter-pile pipe 3, etc., and if necessary, a hardened material (cement milk, mortar, cement, etc.) is used to the extent that it can exhibit a predetermined function as a continuous wall. This concept also includes the case where there is a slight gap between .
In addition, in general, a structure composed of main piles 2 and inter-pile pipes 3 has a plurality of main piles 2 and inter-pile pipes 3 continuously installed adjacently in a similar configuration within a predetermined section. In the following description, only a portion of the plurality of main piles 2 and inter-pile pipes 3 constituting the structure may be shown enlarged for the sake of explanation.

(Continuous wall made of steel pipe piles and construction method thereof according to the embodiment of the present invention)
Hereinafter, an example of a continuous wall made of steel pipe piles and a construction method thereof according to an embodiment of the present invention will be described. The continuous wall 1 according to the present embodiment is constructed, for example, to coffer around a bridge pier in a river or the like, and includes a plurality of main piles 2 installed at substantially constant intervals, and a steel pipe having a smaller diameter than the main piles 2. It is a cut-off wall or the like made of inter-pile pipes 3 which are piles. Here, a continuous wall 1 is a structure constructed by continuously arranging steel pipe piles for water stoppage and earth retention for a given ground, and a method for constructing the continuous wall 1 is exemplified. explain.

The method of installing and press-fitting the main pile 2 and the inter-pile pipe 3 is not particularly limited. For example, using a pile press-in machine 10 as shown in FIG. The pipe 3 is press-fitted. This process is repeated until a predetermined length is reached in the extension direction, and the continuous wall 1 is constructed.

FIG. 2 is a schematic cross-sectional plan view showing an outline of the press-fitting of the main pile 2 and the inter-pile pipe 3. As shown in FIG. As shown in FIG. 2, two main piles 2 forming a continuous wall 1 made of steel pipe piles are press-fitted adjacent to each other with a predetermined distance therebetween by a pile press-in machine 10 . In addition, in the gap between the two main piles 2, on the side that receives the earth pressure or water pressure, the inter-pile pipe 3 is positioned so as to contact both of the two main piles 2 and close the gap between the piles. is pressed in.

FIG. 3 is a schematic illustration of excavation and cleaning in the gaps between the piles 2. As shown in FIG. As shown in FIG. 3, after the main pile 2 and the inter-pile pipe 3 are press-fitted, they are surrounded by the two existing main piles 2 and the inter-pile pipe 3, and the gap formed between these steel pipe piles is set to a predetermined value. A space U (hereinafter also simply referred to as a gap U) is defined, and this predetermined space U is excavated and cleaned. This drilling cleaning may be done by techniques such as high pressure water, down-the-hole hammers, small diameter augers, for example. In addition, when the excavation target is hard ground, the excavation may be performed before the construction of the main pile 2 and the inter-pile pipe 3 .

FIG. 4 is a schematic plan cross-sectional view when the elastic body 40 is inserted into the gap U. As shown in FIG. As shown in FIG. 4, in the gap U after excavation and cleaning, for example, an elastic body 40 which is hollow and configured to allow injection of a fluid such as water, a hardened material, or a filler is inserted as a sealing member from the end. be done. An example of the configuration of the elastic body 40 is a cylindrical body that is elongated in the length direction and that can be elastically expanded and deformed in diameter. hollow so-called tubular members that can be injected into the In this case, one of the ends of the elastic body 40 in the longitudinal direction is an opening, and the other end is closed. That is, in such a configuration of the elastic body 40, the fluid injected into the elastic body 40 through the opening does not leak out from other than the opening.

5A to 5C are schematic explanatory diagrams showing examples of the configuration of the elastic body 40. FIG. As shown in FIG. 5( a ), the elastic body 40 may be a member 40 a composed of a hollow elastic member 42 having an internal space 41 . The cross-sectional shape of the elastic member 42 may be a substantially triangular shape that matches the shape of the gap U, for example. Alternatively, as shown in FIG. 5B, the elastic body 40 may be a member 40b composed of a hollow, substantially V-shaped elastic member 46 having an internal space 45. As shown in FIG.

Also, the elastic body 40 does not necessarily have to be hollow. For example, as shown in FIG. 5C, the elastic body 40 includes a substantially V-shaped first elastic member 52 and a second elastic member 53 arranged adjacent to the first elastic member 52. A member 40c configured by combining the above may also be used. In this case, the first elastic member 52 and the second elastic member 53 are inserted into the gap U together. As shown in the figure, the second elastic member 53 is preferably arranged so as to be sandwiched between the first elastic members 52, and the outer surface of the first elastic member 52 is provided with 1 or 1 for improving sealing performance. A plurality of protrusions 54 may be formed. In addition, it is also possible to use only the 1st elastic member 52 about the member 40c structure of FIG.5(c).

The elastic members 42, 46, 52 are made of stretchable elastic materials such as so-called rubber or silicon members. A fluid such as water, a hardened material, or a filler is injected into the internal spaces 41 and 45 and pressurized to expand the internal spaces. ) to expand the cross-sectional area.

FIG. 6 is a schematic explanatory diagram relating to temporary construction, and is a schematic cross-sectional plan view when water W is injected as a fluid into the elastic body 40. As shown in FIG. As shown in FIG. 6, when the elastic body 40 is pressurized and filled with water W, the elastic body 40 expands and deforms, and hits all of the two adjacent main piles 2 and the inter-pile pipe 3. It touches and is pressed. That is, as shown in the figure, the elastic body 40 filled with water W under pressure has a deformed shape following the circumferential shape of the main pile 2 and the inter-pile pipe 3 .

In the continuous wall 1 in which the elastic body 40 is filled with water W under pressure and the pressurized state is maintained, the elastic body 40 is pressed against all of the two main piles 2 and the inter-pile pipe 3, Since it is in a close contact state, it can exhibit sufficient earth retention and water stoppage. For example, the continuous wall 1 is constructed in a state in which the elastic body 40 is pressurized and filled with water W, the continuous wall 1 is temporarily used for earth retention or water stoppage, and then the continuous wall 1 is removed after a predetermined operation. When the continuous wall 1 is "temporarily constructed", the continuous wall 1 filled with water W under pressure as shown in FIG.

In addition, when the continuous wall 1 is constructed semi-permanently and constructed as an earth retaining wall or a water cutoff wall, so-called "permanent construction", it is necessary to constantly stabilize the earth retaining properties and water cutoff properties. . FIG. 7 is a schematic explanatory diagram of the permanent construction, in which the continuous wall 1 in which the water W is pressurized into the elastic body 40 is filled with a hardened material (cement milk, mortar, Cement, etc.) is being supplied and injected, the inter-pile pipe 3 is pulled out, and water W is removed from the elastic body 40 at the same time. 7(a) to 7(c) show schematic cross sections in chronological order.

When constructing the continuous wall 1 semi-permanently, first, as shown in FIG. At the same time, as shown in FIG. 7(b), the inter-pile pipe 3 is pulled out from the ground, and the water W filled in the elastic body 40 is also removed to reduce the internal volume of the elastic body 40. By pulling out the inter-pile pipe 3 and draining (draining) the elastic body 40, the hardened material 60 pressurized and injected in the predetermined space U flows along the peripheral surface of the main pile 2. . Along with this, the elastic body 40 is pressed along the peripheral surface of the pile 2, and the elastic body 40 deforms so as to follow and adhere to the peripheral surface of the pile 2 (see FIG. 7(c)). . Then, as shown in FIG. 7(c), the elastic body 40 is deformed so as to be in close contact with the peripheral surface of the pile 2 so as to block the gap between the piles 2, and the pressurized state is maintained. The solidification of 60 permanently constructs the continuous wall 1 .
In addition, even if the elastic body 40 is not hollow, the inter-pile pipe 3 is pulled out and the hardened material 60 is allowed to flow in along the peripheral surface of the pile 2, so that the elastic body 40 is formed around the pile 2. Since the hardened material 60 is solidified in this state, it is possible to stably retain earth and stop water.

According to the continuous wall 1 constructed as shown in FIG. Therefore, it is possible to exhibit sufficient earth retention and water stoppage. In addition, in such a configuration of the continuous wall 1, the inter-pile pipe 3 is pulled out and the hardened material 60 is injected under pressure. It becomes the adhesion force in the part. Then, the elastic body 40 is in close contact with the peripheral surface of the pile 2, and by solidifying the hardened material 60 in a state of being pressed by pressure, the gap between the piles 2 is closed without maintaining the pressurized state. ing. Therefore, stable earth retention and water stoppage are realized, and such a configuration is a suitable technique when constructing the continuous wall 1 by so-called "permanent construction". In addition, compared to the configuration described above with reference to FIG. 6, the process of pulling out the inter-pile pipe 3 is performed, and the steel pipe pile does not remain in the ground, so the steel pipe pile cost can be reduced.

Moreover, in both the continuous wall 1 having a configuration suitable for temporary construction described with reference to FIG. 6 and the continuous wall 1 having a configuration suitable for permanent construction described with reference to FIG. 3 is used, the force of diameter expansion deformation of the elastic body 40 becomes the adhesion force of the water stop portion between the elastic body 40 and the pile 2 . Therefore, even if the steel pipe piles (main piles 2 and inter-pile pipes 3) constituting the continuous wall 1 are displaced according to the balance of water pressure and earth pressure, the elastic body 40 follows the displacement. It is possible to maintain high earth retention and water stoppage capacity. Further, as shown in FIGS. 6 and 7, in the continuous wall 1 according to the present embodiment, only the main pile 2, the inter-pile pipe 3, the elastic body 40, and the fluid such as water and hardened material are used. It is possible to construct a continuous wall 1 having a simple structure and having high earth retention and water stopping properties. Also, by using the above-mentioned techniques such as high-pressure water, down-the-hole hammer, and small-diameter auger during excavation and cleaning, construction on hard ground is sufficiently possible.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the illustrated form. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. understood as a thing.

For example, in the above embodiment, the case where the continuous wall 1 is constructed on a predetermined ground has been described as an example, but the scope of application of the present invention is not limited to this. It is also applicable when However, when constructing the continuous wall 1 in water, the process of pulling out the inter-pile pipe 3 while injecting the fluid hardened material 60 as described above with reference to FIG. 7 cannot be performed. Therefore, when constructing the continuous wall 1 in water, the steps described above with reference to FIGS. 2 to 6 may be employed. Alternatively, a configuration may be adopted in which the fluid hardened material 60 is injected into the elastic body 40 instead of the water W, if necessary.

In addition, in the above-described embodiment, examples of the configuration and cross-sectional shape of the elastic body 40 have been illustrated with reference to FIGS. is not. That is, the elastic body 40 is a cylindrical body or an elastic body that is long in the length direction and is elastically expandable in diameter. It may have any shape as long as it has an opening at one end and a closed end at the other end. For example, in the gap U formed between the two main piles 2 and the inter-pile pipe 3 described in the above embodiment, various cross-sectional shapes may be used so as to be suitably accommodated.

INDUSTRIAL APPLICABILITY The present invention can be applied to a continuous wall installed underground for the purpose of stopping water, retaining earth, etc., and a construction method thereof.

DESCRIPTION OF SYMBOLS 1... Continuous wall 2... Pile 3... Pipe between piles 10... Pile press-fit machine 11... Main cylinder 17... Chuck part 40... Elastic body 60... Hardened material U... Gap

Claims (6)

Between a plurality of piles installed at predetermined intervals, an inter-pile pipe is installed so as to contact the pile only on one side of a position that closes the gap between the piles. a continuous wall,
An elastic body that is hollow and elastically expandable and deformable is installed in the gap between the main piles,
The internal space of the elastic body is filled with water or a hardened material under pressure ,
At least a part of the elastic body is pressed against all of the adjacent two main piles and the inter-pile pipe by expanding and deforming the elastic body, and is in a close contact state . continuous wall. A pile-to-pile pipe that is installed so as to contact the pile only on one side of a position that closes the gap between the piles that are installed at predetermined intervals. ,
an elastic body that adheres closely to the peripheral surface of the main pile so as to close the gap between the main piles;
A continuous wall having a hardened material injected into the inter-pile pipe and supplied to a position where the gap between the main piles is closed by pulling out the inter-pile pipe,
The elastic body is configured to be hollow and elastically expandable and deformable, and as the internal space volume of the elastic body decreases, the elastic body is pressed against the peripheral surface of the main pile, and the hardening occurs. A continuous wall, characterized in that it follows along the peripheral surface of the main pile and is brought into close contact with the solidified material. A pile-to-pile pipe that is installed so as to contact the pile only on one side of a position that closes the gap between the piles that are installed at predetermined intervals. ,
an elastic body that adheres closely to the peripheral surface of the main pile so as to close the gap between the main piles;
A continuous wall having a hardened material injected into the inter-pile pipe and supplied to a position where the gap between the main piles is closed by pulling out the inter-pile pipe,
A continuous wall characterized in that it follows and adheres along the peripheral surface of the main pile by solidifying the hardened material in a state where the elastic body is pressed against the peripheral surface of the main pile. . A construction method for constructing the continuous wall according to claim 1,
A plurality of main piles are installed at predetermined intervals, and an inter-pile pipe is installed so as to contact the main pile only on one side of a position where the gap between the main piles is closed,
Excavating and cleaning a predetermined space surrounded by the main pile and the inter-pile pipe,
installing the elastic body in the predetermined space that has been excavated and washed;
The inner space of the elastic body is filled with water or a hardened material under pressure, and the elastic body expands and deforms, so that at least a part of the elastic body is adjacent to the two main piles and the pipe between the piles. A construction method characterized by constructing a continuous wall so as to be pressed against and in close contact with all of . A construction method for constructing the continuous wall according to claim 2,
A plurality of main piles are installed at predetermined intervals, and an inter-pile pipe is installed so as to contact the main pile only on one side of a position where the gap between the main piles is closed,
Excavating and cleaning a predetermined space surrounded by the main pile and the inter-pile pipe,
installing the elastic body in the predetermined space that has been excavated and washed, and filling the internal space of the elastic body with water under pressure;
A fluid hardened material is pressurized and injected into the inter-pile pipe, the internal space of the elastic body is drained, the inter-pile pipe is pulled out, and the elastic body is placed on the peripheral surface of the main pile. A construction method, characterized in that the cured product is solidified while being pressed against. A construction method for constructing the continuous wall according to claim 3,
A plurality of main piles are installed at predetermined intervals, and an inter-pile pipe is installed so as to contact the main pile only on one side of a position where the gap between the main piles is closed,
Excavating and cleaning a predetermined space surrounded by the main pile and the inter-pile pipe,
installing the elastic body in the predetermined space that has been excavated and washed;
A fluid hardening material is pressurized and injected into the inter-pile pipe, the inter-pile pipe is pulled out, and the hardening material is solidified while the elastic body is pressed against the peripheral surface of the main pile. and construction method.

Images