JP7132049B2 - CONTINUOUS WALL OF STEEL PIPE PILE AND CONSTRUCTION METHOD - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous wall made of steel pipe piles installed for the purpose of water stoppage and earth retaining, 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 Documents 2 to 4 disclose techniques for reliably blocking water and earth retention 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 Documents 3 and 4, a hollow cylindrical elastic body that can be expanded and deformed is provided in a gap between members (steel pipe piles, etc.), and the hollow portion of the cylindrical elastic body is pressurized and filled with a filling material to expand. The configuration is such that the members are radially deformed and closely adhered to each other to close the adjacent members.

JP-A-5-112928 JP-A-2005-155303 JP 2013-76313 A Japanese Patent Application Laid-Open No. 2018-12972

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 techniques described in Patent Documents 3 and 4, when the tubular elastic body is pressurized and filled with the filler, there is no member for supporting the tubular elastic body, so the tubular elastic body is opened on the open side. Since the elastic body expands and deforms, the original contact surface pressure of the seal portion cannot be increased to improve water stoppage performance, so there is a risk that sufficient blockage (water stoppage and earth retention) will not be performed. That is, in the techniques described in Patent Documents 2 to 4, 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, an object of the present invention is to provide a continuous wall made of steel pipe piles installed for the purpose of stopping water or retaining earth, even if the steel pipe piles are displaced according to the balance of water pressure, elastic members To provide a continuous wall made of steel pipe piles capable of following the displacement of the wall and realizing sufficient water stoppage and earth retaining by a double structure, and a construction method thereof.

In order to achieve the above object, according to the present invention, a steel pipe pile in which an elastic member is installed at a position that closes a gap between a plurality of main piles installed at predetermined intervals. wherein the elastic member has a hollow member located on one side of the continuous wall and a hollow member located on the other side of the continuous wall, and these hollow members are connected by a connecting member, The hollow member is provided with a continuous wall made of a steel pipe pile, characterized in that the diameter of the hollow member can be expanded and deformed by pressurizing and injecting a fluid therein.

The connecting member includes a pair of holding portions that hold the hollow member, and a connecting portion that connects the pair of holding portions. A configuration in which tension is applied in accordance with deformation may be employed.

One or a plurality of protrusions may be formed on the outer peripheral surface of the hollow member.

In addition, according to the present invention from another aspect, there is provided a construction method for constructing a continuous wall using steel pipe piles as described above, wherein a plurality of main piles are installed at predetermined intervals, and one of the continuous walls An elastic member having a hollow member located on one side and a hollow member located on the other side is installed so as to block the gap between the piles, and water or a hardened material is pressurized into the internal space of the hollow member. A construction method is provided comprising pouring and constructing a continuous wall.

According to the present invention, in a continuous wall made of steel pipe piles installed for the purpose of stopping water or retaining earth, even if the steel pipe piles are displaced according to the balance of water pressure, the elastic member follows the displacement. , it is possible to achieve sufficient water stoppage and earth retention due to the double structure.

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. It is a schematic plane sectional drawing which shows the outline|summary at the time of this pile and elastic member installation. FIG. 4 is a schematic side cross-sectional view showing an outline of installing an elastic member; It is a schematic explanatory drawing of a connection member. It is a schematic explanatory drawing regarding temporary construction. It is a schematic explanatory drawing regarding permanent construction. It is a schematic explanatory drawing regarding the construction method when the distance between piles differs.

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. Moreover, in the pile press-in machine 10, various members (for example, the elastic member 3 described below) can be press-fitted and inserted between the main piles 2. FIG. 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, in the pile press-in machine 10 as described above, the main pile 2 and the elastic member 3 are installed between the main piles 2, and the continuous wall 1 (water stop wall, earth retaining wall) made of steel pipe piles is provided. It is a technology related to the case. 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 pile 2 and the elastic member 3 are used.

In addition, in this specification, this pile 2 may be called a "steel pipe pile" as a general term. In addition, when each member such as the pile 2 and the elastic member 3 "contacts" or "contacts" with each other, in addition to the case where each member directly contacts, hardened materials (cement milk, mortar, cement, etc.) ), the concept includes the case where there is a slight gap between each member to the extent that a predetermined function can be exhibited as a continuous wall structure.
In addition, in general, a structure composed of the main piles 2 and the elastic members 3 has a plurality of the main piles 2 and the elastic members 3 continuously installed adjacent to each other in a similar configuration within a predetermined section. For the sake of explanation, only some of the plurality of main piles 2 and elastic members 3 constituting the structure may be shown enlarged.

(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 the bridge piers in a river or the like, and is installed between a plurality of main piles 2 installed at substantially constant intervals and the main piles 2. It is a water cut-off wall or the like made of an elastic member 3 that is attached. Here, a structure constructed by continuously arranging steel pipe piles for stopping water in water and soil is described as a continuous wall 1, and a method for constructing the continuous wall 1 will be described as an example. .

The method of installing and press-fitting the main piles 2 is not particularly limited. For example, a pile press-in machine 10 as shown in FIG. 1 is used to press-in a plurality of main piles 2 at predetermined intervals. This process is repeated until a predetermined length is reached in the extension direction, and the continuous wall 1 is constructed by performing water stoppage, which will be described later, in the gaps between the plurality of main piles 2 (regions between the steel pipe piles).

FIG. 2 is a schematic cross-sectional plan view showing an outline of the installation of the pile 2 and the elastic member 3. As shown in FIG. As shown in FIG. 2, two main piles 2 constituting a continuous wall 1 made of steel pipe piles are press-fitted adjacent to each other with a predetermined distance therebetween, for example, by the pile press-in machine 10 described above. In addition, in the gap between the two main piles 2, the elastic member 3 is installed at a position such that the gap between the main piles 2 is blocked. The elastic member 3 has one hollow member 3a installed on the side receiving water pressure and the other hollow member 3b installed on the side not receiving water pressure. Further, the hollow member 3a on one side and the hollow member 3b on the other side are partially or entirely connected via a connecting member 40. As shown in FIG.

3A and 3B are schematic side cross-sectional views showing an outline of when the elastic member 3 is installed, FIG. 3A shows before water stoppage, FIG. The drawing assumes that the right side is the construction surface and drains water. In the actual construction of the continuous wall 1, the main pile 2 and the elastic member 3 are constructed together. As an example, a case where the elastic member 3 is installed in water and in the ground is illustrated. As shown in FIG. 3, the hollow members 3a and 3b of the elastic member 3 are inserted in the longitudinal direction (vertical direction: vertical direction in the figure) over water, in water, and in the ground. In this case, the continuous wall 1 functions as a cutoff wall above water and underwater, and as an earth retaining wall under the ground.

Above water and underwater in FIG. 3, one hollow member 3a and the other hollow member 3b are connected by connecting member 40.
When installing the elastic member 3 in the ground, after installing a guide material such as a small-diameter pipe, excavate the inside of the guide material, remove the guide material such as a small-diameter pipe, etc., and secure a space in the ground before installing. I do. This excavation may be performed by techniques such as down-the-hole hammers, small diameter augers, for example. In addition, since the surrounding soil serves as a guide to hold the position of the elastic member 3 in the ground, it is not necessary to provide a connecting member between the hollow member 3a and the hollow member 3b.

Further, as shown in FIG. 3(b), a main pile 2 and an elastic member 3 (not shown) are installed to construct a continuous wall 1 to constitute a water stop wall, and water is drained on one side (right side in the figure). In this case, the ground may be excavated to a predetermined depth after draining water (see shaded area in the figure). Regarding installation of the elastic member 3 in the ground, it is required to insert the elastic member 3 to a sufficient depth in consideration of such excavation of the ground.

The connecting members 40 may be preferably provided at a plurality of locations at predetermined intervals in the longitudinal direction of each of the hollow members 3a and 3b, and the positions and number thereof are not particularly limited. In addition, in the configuration according to the present embodiment, the upper ends of the hollow members 3a and 3b are positioned above the water, and the upper ends thereof are open. configuration.

As shown in FIGS. 2 and 3, the hollow members 3a and 3b that constitute the elastic member 3 are cylindrical bodies that are long in the length direction and can be elastically deformed to expand their diameter. The cross-sectional shape can be arbitrarily designed, and the hollow members 3a and 3b are so-called tubular members into which fluid can be injected. In each of the hollow members 3a and 3b, one end (upper end in FIG. 3) of the length direction ends is an opening, and the other end (lower end in FIG. 3) is closed. is doing. In other words, the fluid injected into the hollow members 3a and 3b from the openings does not leak out from any part other than the openings. In addition, the cross-sectional shape of the hollow members 3a and 3b is preferably, for example, a substantially circular shape from the viewpoint of closing the gap between the main piles 2 by diameter expansion deformation.

The hollow members 3a and 3b forming the elastic member 3 are made of a stretchable elastic material such as so-called tubular rubber or silicon member. That is, when a fluid such as water, a hardened material, or a filler is injected into the interior and pressurized, the interior space expands, and the hollow members 3a and 3b elastically stretch (diameter-expanding deformation). It has a configuration that expands the cross-sectional area. Further, although the material and shape of the connecting member 40 are not particularly limited, for example, the connecting member 40 is preferably an inelastic body, and includes two holding portions for holding the hollow members 3a and 3b, and holding portions for holding them. For example, it may be a figure-of-eight-shaped member or a spectacle-shaped member consisting of a connecting portion that connects the portions.

4A and 4B are schematic explanatory diagrams of the connecting member 40, in which FIG. 4A shows the hollow member before diameter expansion, and FIG. 4B shows the hollow member diameter expansion. The dashed lines in the drawing represent the hollow members 3a and 3b, the shape of which changes as appropriate due to diameter expansion deformation. As shown in FIG. 4, the connecting member 40 includes holding portions 40a and 40b which are annular in plan view and can hold the hollow members 3a and 3b, respectively, and approximately It is composed of a linear connecting portion 40c. The holding portions 40a and 40b are deformed in accordance with the diameter expansion deformation of the hollow members 3a and 3b, and tension or the like is applied to the connecting portion 40c according to the deformation, thereby changing the connecting length. The holding portions 40a and 40b and the connecting portion 40c may be formed of an integral belt-shaped non-elastic member, and as can be seen by comparing FIGS. When the diameter expands and deforms, tension is applied to the connecting portion 40c, shortening the distance between the centers of the hollow members 3a and 3b (P1 and P2 in the drawing). As shown in the figure, as the hollow members 3a and 3b and the holding portions 40a and 40b expand and deform, the center distance between 3a and 3b becomes shorter (P1>P2).

FIG. 5 is a schematic explanatory diagram relating to temporary construction, and is a schematic plan cross-sectional view when water W is pressurized and injected as a fluid into the hollow members 3a and 3b. As shown in FIG. 5, when the hollow members 3a and 3b are filled with water W under pressure, the diameters of the hollow members 3a and 3b are expanded and deformed. is applied, the hollow members 3a and 3b are both pressed against the main pile 2 in the gap between the two adjacent main piles 2. As shown in FIG. That is, as shown in the figure, the hollow members 3a and 3b are pressed so as to follow the shape of the peripheral surface of the pile 2, and the gap between the piles 2 is closed.

In this way, the hollow members 3a and 3b are filled with water W under pressure, and in the continuous wall 1 in which the pressurized state is maintained, the hollow members 3a and 3b are pressed against the peripheral surface of the pile 2 and are in close contact. Since it is in the state, it can exhibit sufficient water stoppage. For example, the continuous wall 1 is constructed in a state in which the hollow members 3a and 3b are pressurized and filled with water W, and the continuous wall 1 is temporarily stopped by the continuous wall 1, 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. 5 can sufficiently stop water. In addition, in the continuous wall 1 according to the present embodiment, the hollow member 3a or 3b has a double structure to stop water on both the side receiving the water pressure and the side not receiving the water pressure, so the sealing performance is extremely high. High construction can be performed. Furthermore, by draining the water W filled in the hollow members 3a and 3b, these members can be easily recovered and reused, and workability can be improved and costs can be reduced.

Further, when the continuous wall 1 is semi-permanently constructed as a water cutoff wall, so-called "permanent construction", it is necessary to stabilize the water cutoff property more constantly. FIG. 6 is a schematic illustration of permanent construction, showing a configuration in which a hardening material (cement milk, mortar, cement, etc.) U, which is a fluid, is injected under pressure into the interiors of the hollow members 3a and 3b. As shown in FIG. 6, the hollow members 3a and 3b are pressurized with the hardened material U to expand and deform the hollow members 3a and 3b, thereby applying tension between the hollow members 3a and 3b. , the hollow members 3a and 3b are both pressed against the pile 2 in the gap. By solidifying the cured material U in this state, the continuous wall 1 is permanently constructed.

In the configuration of the continuous wall 1 permanently constructed by the hardened material U shown in FIG. The hardened material U is solidified while the members 3 a and 3 b are pressed against the piles 2 to close the gap between the piles 2 . Therefore, stable waterproofing is realized, and the configuration is suitable for so-called "permanent construction" in which the continuous wall 1 is semi-permanently constructed. In addition, in this configuration, since the cured product U is injected into, for example, the tubular hollow members 3a and 3b, the cured product U is not contaminated from the outside. It is also prevented that U is mixed with water and diluted.

In addition, according to the construction method of the continuous wall 1 according to the present embodiment, it is possible to realize effective water stoppage even when the distance between the piles varies among the plurality of press-fitted main piles 2. It is possible. 7A and 7B are schematic explanatory diagrams relating to the construction method when the distance between piles is different, in which (a) is a case where the distance between piles is narrow, and (b) is a case where the distance between piles is wide. Here, FIG. 7 shows an example in which the water W is pressurized into the hollow members 3a and 3b (temporary construction). A similar effect can be obtained.

As described above with reference to FIG. 4, according to the configuration of the elastic member 3 according to the present embodiment, the hollow members 3a and 3b are filled with the water W (or the hardened material U) under pressure, depending on the injection amount. The amount of diameter expansion deformation of the members 3a and 3b can be adjusted. That is, as shown in FIG. 7, there is a variation in the distance between a plurality of existing main piles 2, for example, there are places where the distance between piles is different between Q1 and Q2 (Q1<Q2) at the same construction site. Even so, by changing the injection amount of the water W (or the hardened material U) injected under pressure into the hollow members 3a and 3b, it is possible to effectively cut off the water between the piles regardless of the distance between the piles. can be realized.

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 connecting member 40 described in the above embodiment, the holding portion 40a and the connecting portion 40b may be made of different materials. For example, the holding portion 40a may be an elastic body that expands and deforms, and the connecting portion 40b may be a non-elastic body. Also, all of the connecting members 40 may be made of an elastic material. Further, surface treatment such as rubber lining may be applied to the connecting member 40 .

In addition, in the above-described embodiment, the hollow members 3a and 3b and the surface shape of the connecting member 40 are not particularly mentioned. In order to improve the sealing performance of each member, one or more projections or the like may be provided on the surface (peripheral surface) of each member.

INDUSTRIAL APPLICABILITY The present invention can be applied to continuous walls made of steel pipe piles installed for the purpose of water stoppage and earth retaining, and construction methods thereof.

DESCRIPTION OF SYMBOLS 1... Continuous wall 2... Main pile 3... Elastic member 3a, 3b... Hollow member 40... Connection member 40a, 40b... Holding part 40c... Connection part W... Water U... Hardened material

Claims (4)

A continuous wall made of steel pipe piles in which an elastic member is installed at a position that closes the gap between the piles between a plurality of piles that are installed at predetermined intervals,
The elastic member has a hollow member positioned on one side of the continuous wall and a hollow member positioned on the other side, and these hollow members are connected by a connecting member,
A continuous wall made of steel pipe piles, wherein the hollow member is deformable in diameter by pressurizing and injecting a fluid thereinto. The connecting member includes a pair of holding portions that hold the hollow member and a connecting portion that connects the pair of holding portions,
The continuous wall made of steel pipe piles according to claim 1, characterized in that said connecting portion is configured so that tension is applied according to deformation of said holding portion according to deformation of diameter expansion of said hollow member. The continuous wall made of steel pipe piles according to claim 1 or 2, characterized in that one or more protrusions are formed on the outer peripheral surface of the hollow member. A construction method for constructing a continuous wall using the steel pipe pile according to any one of claims 1 to 3,
A plurality of piles are installed at predetermined intervals, and an elastic member having a hollow member positioned on one side of the continuous wall and a hollow member positioned on the other side is used to close the gap between the piles. and
A construction method comprising: constructing a continuous wall by pressurizing and injecting water or a hardened material into the inner space of the hollow member.

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