JPH04146331A - Underground wall and construction method therefor - Google Patents

Abstract

PURPOSE:To make outbreak unnecessary by pushing one wall to the outside from the inside of an excavated hole after a plurality of walls to slide and contact both ends each other are buried into the ground so that they come along each of square-shaped sides. CONSTITUTION:The first wall 1 forming tapered slide and contact receiving faces 5 inclined in the direction of advancement inward of an excavated hole 4 on the longitudinal ends is buried into the ground. After that, the second wall 2 forming sliding faces 6 to slide and contact the slide and contact receiving faces 5 on both ends is buried into the ground. The excavated hole 4 is formed in the ground surrounded by the first wall 1 and second wall 2. Then, the first wall 1 is simultaneously pushed to the outside by pushing the second wall 2 to the outside from the inside of the excavated hole 4 with liquid pressure cylinders 3. According to the constitution, outbreak and backfiring caused by outbreak are not require and, at the same time, the peripheral ground is consolidated, so that compaction is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of constructing a polygonal underground wall such as a box shape, and a wall used in the method.

(Conventional technology) When constructing an underground wall such as a box-shaped structure, conventionally, an excavation hole larger than the intended size was dug and a concrete wall was erected along the sides of this excavation hole to form a box-shaped structure. A box-shaped wall structure is assembled into a wall or a box-shaped wall structure is embedded in an excavated hole. After the box-shaped wall is constructed, the ground around the wall is backfilled and compacted. It has an underground wall.

(Problems to be Solved by the Invention) However, in the conventional method, an area larger than the target size is excavated, which requires a site area for this purpose. In addition, it is necessary to backfill and compact the ground, which is troublesome and, if the compaction is insufficient, causes the underground wall to tilt and the ground to subside at the backfilled portion.

The present invention has been made in consideration of such circumstances, and provides a method for constructing an underground wall body and an underground wall body that eliminates the need for over-excavation, as well as backfilling and compaction. It is an object.

(Means for Solving the Problems) In order to achieve the above object, the construction method of the present invention is such that, after burying a plurality of walls in the ground along each side of a rectangular shape, the walls whose ends are in sliding contact with each other are buried in the ground! ! Sound inside the body is excavated, and then one of the adjacent wall bodies is pushed outward while the other wall body is pushed outward at the sliding contact portion.

Further, the wall body of the present invention used in this construction method includes a first wall body that has tapered sliding contact surfaces formed at both ends and is buried in the ground at intervals of one side of the rectangle; A second wall body is provided with tapered sliding surfaces formed at both ends thereof, and is buried underground so as to be located between the first wall bodies and moves outwardly.

In the wall described above, a guide steel plate can be attached to the sliding contact surface of the first wall and the sliding surface of the second wall so as to be in sliding contact with each other. Further, in this case, a recess for filling a water stop material may be formed in either one of the guide steel plates, or caulking may be applied to the inner end portion where the guide steel plate slides.

(Function) In the construction method described above, by extruding one wall outward, the other wall is simultaneously extruded, and an underground wall of a predetermined size can be constructed. This eliminates the need for extra digging and backfilling as in the past. Moreover, since the ground around the underground walls is consolidated by extrusion of each wall, compaction is not necessary.

Further, in the above wall, when the second wall is extruded, the sliding surface thereof slides along the sliding contact surface of the first wall. Since these surfaces are tapered, the component force of the extrusion of the second wall acts on the first wall, and the first wall is simultaneously extruded outward, finishing the wall structure with a predetermined size. be able to. At this time, the guide steel plate acts to ensure smooth sliding between the sliding contact surface and the sliding surface. In addition, when the recess for filling the water stop material is filled with a water stop material or when the guide steel plate is caulked, the water stop property is improved.

(Example) Figures 1 to 3 show a method for constructing a rectangular underground wall and a first example of the wall, including a first wall 1 and a second wall 2 formed of reinforced concrete. Construction is performed by the drive machine 3.

The first wall 1 has tapered sliding contact surfaces 5 that are inclined in the direction of inward advancement of the excavated hole 4 at both ends in the longitudinal direction, and is buried in the ground by an appropriate means such as press-fitting or driving. be done. Second
The wall 2 has tapered sliding surfaces 6 at both ends that slide into sliding contact with the sliding contact surface 5 of the first wall 1, and is buried underground like the first wall 1.

In the ground closed by the first wall 1 and the second wall 2, an excavated hole 4 is formed as shown in FIG.

The drive It&3 pushes this second wall body 2 outward, and uses a fluid pressure cylinder or the like.

Next, a method of constructing an underground wall according to this embodiment will be explained.

One first wall 1a is press-fitted into the ground, and then the second wall 2
a, 2b are press-fitted perpendicularly to the first wall 1a. At this time, the second wall 2 is press-fitted so that it is located a distance A inside the outer edge of the excavated hole 4 (the edges at both ends of the first wall 1). Next, the other first wall 1b is press-fitted into the ground so as to be perpendicular to the second walls 2a, 2b and parallel to the first wall 1a.

In the above case, the order of embedding the walls was wall 1a → wall 2a → wall 2b, 4Ii, lb, but four walls may be buried at the same time. In both cases, the drilled hole 4 is smaller than the final finished size.

In order to easily press-fit the first wall 1 and the second wall 2, the lower ends of the first wall 1 and the second wall 2 are appropriately formed into a pointed shape (see Fig. 1). b)).

During the excavation of this excavated hole 4, a movable mechanism 3 is attached to the inner surface of the first wall body 1. That is, as shown in FIG.
be fixed to the inner surface of the Next, final excavation is carried out, the ground is dug down to L2, and the drive machine 3 is installed. If the excavation is deep and there is a risk of the wall toppling over due to earth pressure, excavate as appropriate and install the drive machine before the final excavation.

The drive device 3 includes an extrusion rod 3b that extends from a main body 3a fixed to the inner surface of the first wall 1, and extends so that the tip of the extrusion rod 3b comes into contact with the inner surface of the second wall 2. It is attached. After this installation of the drive machine 3, the drive machine 3 is operated to extend the extrusion rod 3b. Since the second wall 2 moves outward due to the extension of the push rod 3b, the second wall 2 comes into contact with the inner surface of the excavated hole 4, as shown in FIG.

When the second wall 2 moves, the sliding surface 6 of the second wall 2 slides along the sliding surface 5 of the first wall 1, but the sliding surface 6 and the sliding surface 5 Since they have a tapered shape that makes sliding contact with each other, a component force in the orthogonal direction of the pushing force of the second wall body 2 acts on the sliding receiving surface 5.

Therefore, as the second wall 2 moves, the first wall 1 is forcibly pushed outward in a direction perpendicular to the direction of movement of the second wall 2. FIG. 4(b) shows this state, and when the second wall 2 moves by a distance A, the first wall 1 moves by a distance B in the orthogonal direction. By moving the walls 1 and 2 by these distances, it is possible to construct an underground wall having the desired dimensions.

Note that, after extruding the second wall body 2, the driving machine 3 fixes each wall body, is removed as appropriate, and is removed from the underground wall body.

Since both the first and second walls are pushed outward in this way, the ground around the excavation hole 4 is consolidated and compacted, so that the underground walls are firmly supported and do not tilt. The ground around the underground wall does not sink over time. Furthermore, by moving the first and second walls, the underground wall has the desired dimensions, so there is no need to construct an excavation hole 4 larger than the desired dimension, and construction can be performed reliably even if there is not enough site area. I can do it.

FIG. 5 shows a second embodiment of the wall according to the invention, in which hole 1 wall 1
A guide steel plate 7 is attached along the sliding contact surface 5 of the second wall, and a guide steel plate 8 that slides on the guide steel plate 7 is attached to the sliding surface 6 of the second wall. In order to firmly attach the guide steel plates 7 and 8, the guide steel plate 7 is welded to an anchor 9 buried in the first wall 1, and the guide steel plate 8 is welded to an anchor 10 buried in the second wall 2. . By installing such a guide steel plate 7.8, the first and second
The sliding contact portion of the wall can be reinforced, allowing smooth sliding.

In addition, the guide steel plates 7.8 can be welded after the underground wall of the desired dimensions has been constructed by extrusion of the second wall 2. FIG. 6(a) shows this state, in which vertical welds 11 are formed at the ends of the guide steel plates 7 and 8 located inside the underground wall. This welding increases the bonding force between the first wall 1 and the second wall 2, thereby increasing the mechanical strength of the underground wall. In addition to this welding, caulking, which will be described later, may be applied (see FIG. 6(b)).

Figures 7 and 8 show a third embodiment of the wall.
In this embodiment, a recess 12 is formed in the vertical direction in the guide steel plate 8 attached to the second wall 2, and the recess 12 is filled with a water stop material 13. Further, in FIG. 8, in addition to the water stop material 13, caulking 14 is applied in the vertical direction to the inner end portion of the sliding contact portion of the guide steel plate 7.8. With the structure shown in FIGS. 7 and 8, water-stopping properties of the sliding contact portions of the walls 1 and 2 can be ensured. Note that the recess 12 for filling the waterproofing material may be formed in the guide steel plate 7 of the first wall 1, or may be formed in the guide steel plates 7.8 of both walls, without using a stopper. .

Water-stopping properties may be improved by applying only caulking 14.

FIG. 9 shows a method of constructing a hexagonal underground wall. Reference numeral 21 in the figure is the first wall. This first wall 21
are press-fitted into the ground at intervals of one side of the hexagonal shape.

Reference numeral 22 denotes a second wall body buried underground so as to be located between such first M bodies 21 . This second wall 22
is press-fitted so as to be located somewhat inward from the first wall body 21. Further, both ends of the second W body 22 are notched diagonally to form a sliding surface 22a.

The excavated hole 24 is formed by excavating the ground blocked by the first wall 21 and the second wall 22.

In this embodiment, the inner surface of the first wall 21 is itself a second wall.
The sliding surface 22a of the wall 22 becomes a sliding contact surface 21a that comes into sliding contact. In this state, the second wall 22 is pushed outward,
A hexagonal underground wall can be constructed in the same way as a box-shaped wall.

In the embodiment described above, after one first wall is erected,
The second wall was buried, but in the present invention, the first wall and the second wall are assembled into a predetermined square shape and buried at the same time, and then this assembly is released and the second wall is pushed out and moved. It's okay. Furthermore, the present invention can be similarly applied to the construction of other polygonal underground walls other than those illustrated.

(Effects of the Invention) According to the construction method of the present invention, by extruding one wall, the other adjacent wall is extruded, and it is possible to construct an underground wall with the desired dimensions, so there is no need for over-drilling. There is no need for backfilling caused by over-excavation, and since the surrounding ground is consolidated, there is no need for compaction.

Further, in the wall of the present invention, along the sliding contact surface of the first wall,
Since the sliding surface of the second wall slides, the first wall can be pushed out and moved at the same time as the second wall is pushed out.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIGS.
The figure shows the process order of the construction method, and Figures 1 (a) and (b)
2(a) and 2(b) are a plan view and a cross-sectional view of the main parts of the burying process of the second wall, and FIG. 3 is a driving means. 4(a) and 4(b) are plan views and cross-sectional views of the main parts of the extrusion process of the second wall body, and FIGS. 5 and 6 are the walls of the present invention. 7 and 8 are partially cutaway sectional views of the second embodiment of the wall body, and FIG. 9 is a plan view showing the second embodiment of the construction method. It is.

Claims (5)

[Claims] (1) After burying multiple walls whose ends are in sliding contact with each other in the ground along each side of the rectangle, excavating the inside of the walls, then removing one of the adjacent walls. A method of constructing an underground wall body by pushing the other wall body outward at the sliding contact portion while pushing the wall body outward. (2) A first wall body with tapered sliding contact surfaces formed at both ends and buried in the ground at intervals of one side of the square, and a tapered sliding surface that slides on the sliding contact surfaces at both ends. and a second wall formed in the ground and located between the first wall and pushed outward. (3) The wall body according to claim 3, characterized in that a guide steel plate is attached to the sliding contact surface of the first wall body and the sliding surface of the second wall body so as to be in sliding contact with each other. (4) The wall body according to claim 3, wherein a recessed portion for filling a water stop material is formed in either one of the guide steel plates. (5) The wall body according to claim 3, wherein an inner end portion in which the guide steel plate slides is caulked.