JPH08246478A - Construction method of leaning type retaining wall consisting of foundation slab of horizontal pile - Google Patents

Abstract

(57) [Summary] [Purpose] The construction is simple, the amount of earthwork is small, and it is economical.
To provide a method for constructing a leaning retaining wall consisting of a horizontal bottom foundation slab that can be applied even when the foundation bottom slab and back ground are soft. [Structure] After digging the ground G to the bottom of the retaining wall, piles 3 are laid from the same position in a horizontal direction in a parallel state to a predetermined depth in the ground to construct the base bottom slab 4 of the retaining wall. After being fixed in the deep part of the natural ground, the leaning vertical wall 5 is built up to a predetermined height on the foundation slab.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a leaning type retaining wall made of a horizontal pile foundation ground to which a leaning type retaining wall can be applied even if the foundation ground is not solid.

[0002]

2. Description of the Related Art When constructing roads and residential land, embankment and cutting are almost always performed. At this time,
When cutting and embanking at a steeper slope than the slope slope, depending on the conditions of the ground, gravity type retaining wall, L type retaining wall, inverted T type retaining wall, retaining wall retaining wall, or leaning Adoption of various earth retaining walls, such as type retaining walls, will be considered.

[0003]

However, the gravity retaining wall, the L-shaped retaining wall, and the inverted T-shaped retaining wall cannot be applied unless the foundation ground is good, and the back ground excavation and backfilling are required, and the earthwork amount There are many problems. In addition, the retaining wall retaining wall is lightweight and can be applied to soft ground, and it is economical when the height is high, but there are problems such as complicated construction and compaction of backfill material and a large amount of earthwork. is there.

On the other hand, the leaning type retaining wall is economically excellent in that the wall thickness is thin, construction is simple, and the amount of earthwork is small, and it is suitable for one-side cutting of mountain roads, one-sided embankment and widening of roads. Since the structure is stable and leans against the back ground or backfill soil, the foundation ground and back ground must be solid. The present invention has been proposed in view of such circumstances, the objective is to economically excellent such as the simple construction and the minimum earthwork amount, when the foundation floor slab and the back ground are soft. The point is to provide a method of constructing a leaning retaining wall consisting of a horizontal bottom slab that can also be applied.

[0005]

In order to achieve the above object, according to the method of constructing a leaning type retaining wall consisting of a foundation bottom slab of a horizontal pile according to the present invention, earth is cut to the bottom of the retaining wall. After digging down, piles were laid from the same position in a horizontal direction in parallel to a predetermined depth in the ground, and the foundation bottom slab part of the retaining wall constructed by the horizontal pile group was fixed to the back ground in the ground. After that, the vertical wall of the leaning part is constructed on the foundation slab to a predetermined height.

[0006]

According to the present invention, as described above, the ground is cut to the bottom of the retaining wall and dug down, and then piles are laid from the same position in a substantially horizontal direction in parallel to a predetermined depth in the ground. After it has settled in the ground, the vertical wall of the leaning part will be built up on the horizontal pile group, so the horizontal pile group will serve as a kind of wide bottom slab to disperse the load of the back earth pressure. , It avoids the concentration of stress on the foundation ground and makes it difficult for the foundation ground to deform, and even if the foundation ground or the back ground is not solid, the leaning type retaining wall can be applied. It is something that can be done.

[0007]

The present invention will be described below with reference to the illustrated embodiments. G is the ground, and the ground of the cut part 1 by the excavating machine etc.
The site 2 is constructed by cutting and digging along the back surface S of the leaning vertical wall to the position of the bottom surface of the retaining wall foundation. (Refer to FIG. 3) At this time, a cut surface causes a slope due to the back surface S of the leaning part vertical wall, but when the geology of the back ground is poor,
Appropriate slope stabilization measures such as slope protection soil by mortar spraying and reinforcing bar reinforcement will be taken to prevent the ground from collapsing.

Next, on the site 2, from the position corresponding to the foundation slab to the inner part of the back ground, in a substantially horizontal direction and at a certain interval ΔH, a predetermined depth is provided in parallel. Until now, pile 3 is placed. (See Fig. 4 (a) and (b)) The piles 3 to be laid at this time are prefabricated piles, cast-in-place piles, or H piles in consideration of the conditions of the ground, the size of the retaining wall, the economic efficiency, and the construction space on site. Select from steel piles made of steel, etc. The interval ΔH between the piles 3 is also determined according to the strength of the foundation ground, the magnitude of the earth pressure acting from the back ground, and the like.

Next, crushed stones are laid on the bottom of the excavated ground, sufficiently compacted, and leveled concrete is placed. Then, the heads of the horizontal pile group 3 are rigidly connected with concrete and a reinforcing bar or steel material, etc. Install 4. (Figure 5 (a)
(See (b)) Next, the leaning vertical wall 5 is built up from the foundation bottom slab 4 to a predetermined height. (See FIG. 6) At this time, when the soil of the ground G on the back surface is firm, it is not necessary to arrange reinforcing bars inside the vertical wall 5, and a vertical wall made of unreinforced concrete can be used. However, when the back ground is not firm and causes large deformation, or even when the ground is firm, when the height of the vertical wall 5 of the leaning part is high and a large back earth pressure is exerted, the foundation bottom slab 4 is The vertical wall 5 and the vertical wall 5 are rigidly connected to each other, and reinforcing bars are also arranged in the vertical wall 5 to form an anti-earth pressure structure.

1 and 2 show a leaning retaining wall constructed by the above process.

[0011]

As described above, according to the present invention, the piles are laid in a substantially horizontal direction from the position where the ground is dug down to the bottom of the retaining wall, and the piles are driven to a predetermined depth in the ground and the horizontal piles are mounted. Since the foundation slab part of the retaining wall constructed by the group was settled in the deep part of the back ground, the vertical wall of the leaning part from the foundation slab was constructed to a predetermined height, so the horizontal pile group is a kind of wide width. Since it acts as a bottom slab and disperses the load received by the retaining wall such as earth pressure and transmits it to the surrounding ground, the deformation of the foundation ground can be suppressed to a low level.

From the standpoint of ground conditions, the leaning type retaining wall according to the present invention can be applied even when the L-shaped retaining wall or the inverted T-shaped retaining wall is applied. Since it is not necessary, the amount of earthwork will be greatly reduced, the construction will be simplified and the economy will be improved. Furthermore, the vertical wall of the leaning type retaining wall can be made of reinforced concrete to have an anti-earth pressure structure, and the leaning type retaining wall can be applied instead of the L type retaining wall and the inverted T type retaining wall. The range of application can be expanded. At this time, since the ground excavation can be performed up to the back surface of the vertical wall of the leaning portion, the amount of excavated soil can be minimized, and backfilling soil is not required, so that the workability is remarkably improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a leaning retaining wall constructed by the method of the present invention.

FIG. 2 is a cross-sectional view taken along the line aa ′ in FIG.

FIG. 3 is a side sectional view showing a state in which the ground of the cut soil is excavated to the retaining wall foundation surface.

4 (a) and (b) are a side sectional view and a front view showing a state in which a pile is driven horizontally in the back ground.

5A and 5B are side sectional views and front views showing a state in which a foundation slab portion is constructed.

FIG. 6 is a side cross-sectional view showing a construction and a situation of a leaning vertical wall on the foundation slab.

[Explanation of symbols]

 G Ground S Back of vertical wall of leaning part 1 Ground of cut part 2 Site 3 Pile 4 Foundation slab 5 Vertical wall of leaning part

Claims (1)

[Claims] 1. The ground is cut to the bottom surface of the retaining wall and dug down, and then piles are laid from the same position in a substantially horizontal direction in parallel to a predetermined depth in the ground, and thus constructed by the horizontal pile group. After the base slab of the retaining wall has been fixed in the deep part of the back ground, the vertical wall of the leaning part is constructed on the base slab to a predetermined height. How to build a wall.