JPH05485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a method for constructing an underground structure characterized by earth retention shoring.

《Conventional technology》 In the conventional strut-type earth retaining method, a retaining wall is generally constructed while excavating, and the constructed retaining wall is raised up on the first stage, supported by struts, and successively dug to the planned deepest point, and then submerged. Then, excavation will proceed while supporting the retaining wall with the second and third stages of uprights, struts, etc.

Afterwards, raise the wall from the deepest point and pour concrete for the inner wall up to the bottom of the struts, and as soon as this reaches the required strength, remove the struts, etc. in that part, and pour concrete directly above to achieve strength. If so, remove the struts in this area. The underground construction was completed by repeating this work one after another, moving upwards.

[Problem to be solved by the invention] In the above conventional construction method, the struts cannot be removed until the concrete poured for the inner wall reaches the required strength, and it is difficult to construct the upper inner wall. However, since the struts were a hindrance, it was necessary to remove them once, which undeniably caused complications between different industries and lengthened the construction period.

The present invention was made in view of the problems described above, and its purpose is to eliminate the need for raising or replacing struts, and in particular for underground structures that do not have a floor slab or have a high floor. Our goal is to provide useful construction methods for construction work.

<Means for Solving the Problems> In order to achieve the above object, the method for constructing an underground structure of the present invention is a method of constructing an underground structure using a bracket in an earth retaining method that uses shoring such as beams and erecting for root cutting work. A detachable adjustment member is provided at the end of the bracket on the side of the bracket, the adjustment member and the bracket are connected to support the retaining wall, and the adjustment member of the bracket is located inside the retaining wall to the extent that it can be removed later, and Concrete constituting the inner wall is poured all over the inside of the retaining wall without repositioning the raised wall away from the raised wall, and when the poured concrete has developed a predetermined strength, the bracket is The tummy tuck is removed by removing the adjustment member.

<<Operation>> Earth pressure is received by the proximal end surface of the bracket and transmitted to the abdominal riser via the adjustment member. The ribs are connected to the free end side (tip side) of the adjustment member of each bracket, transmitting the earth pressure that each bracket receives to the ribs, and inserting a strut between the facing ribs as necessary. or construct shoring with flint beams placed at the corners.

Concrete for the inner wall will be poured over the entire surface while embedding the above-mentioned brackets, and no refilling will be performed.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows how, when excavating deep underground, the retaining wall 1 is supported by uprights 2 every time about 3 to 4 meters are dug during the excavation.

Since FIG. 1 omits the details of the stand-up 2 and the bracket 3 that carries or supports it, FIG. 2 shows a partial plan view thereof.

The planar shape of the excavation is approximately square, and the inner wall is a vertical wall with no floor slab installed in the middle. Therefore, the retaining wall 1 is constructed in a square shape inside the excavation hole, and a plurality of brackets 3 are placed horizontally in contact with the same reference point at required intervals, and a brace 2 is placed on the top of the brackets 3. However, a detachable adjustment member 4 is provided at the top of the bracket 3. The adjusting member 4 may be obtained by connecting the bracket 3 in a two-stage manner (for example, with bolts, etc.), or the top portion of the bracket 3 may be processed in advance so as to be easily cut by melting. The abdominal riser 2 is connected to this adjustment member 4.

The length of the bracket 3 is at least the thickness of the inner wall, and the adjustment member 4 is added to this length. Moreover, these materials may be made of steel or concrete blocks having the required strength. Since the tip positions of the brackets 3 will be uneven due to unevenness on the surface of the retaining wall 1, expandable mortar or the like is injected between the base end surface of the bracket 3 and the surface of the retaining wall 1 to make the tips of the brackets 3 uniform. You may want to adjust it. In other words, this is to make the earth pressure transmitted to the upright 2 as uniform as possible.

Thus, the belly riser 2 is attached to the adjustment member 4 provided at the top of the bracket 3. The belly stand 2 is configured in a rectangular shape. A flint beam 6 with a Kirin jack 5 interposed thereon is installed at the corner thereof.

Each giraffe jack 5 is adjusted to extend or contract, and the force against earth pressure of the belly raiser 2 is adjusted.

In this embodiment, the planar area of the excavation hole is small and deep, so only the flint beams 6 are sufficient without using struts, but if the planar area is large, struts and crosspieces are used.

The support for the retaining wall 1 is constructed as described above,
Next, the concrete for the inner wall 7 is poured without replacing the shoring, that is, the upright 2.
This concrete is poured leaving the adjustment member 4 intact. Therefore, the bracket 3 remains buried within the inner wall 7. (Figure 3).

Once the strength of the poured concrete has been achieved, the adjusting member 4 is removed from the head of the bracket 3, and the head of the bracket 3 is finished by filling it with mortar. In detail, after removing the flint beam 6 and dismantling and transporting the riser 2, the adjustment member 4 was removed and finishing work including the head of the bracket 3 was carried out (Fig. 4), and the construction of the main part of the underground work was completed. do.

In the embodiment, the bracket 3 and the adjusting member 4 are interposed between the riser 2 and the retaining wall 1, but the present invention is not limited to this, and the present invention is not limited to this. You may also use bundled material.

<<Effects of the Invention>> As described above, according to the method of constructing an underground structure of the present invention, a detachable adjustment member is provided at the top of the bracket, that is, at the side end of the riser, and the riser is raised above the inner wall surface. Therefore, there is no problem with the inner wall work such as formwork work or the removal work of the raised bed.Moreover, by burying the brackets, work on the upper inner wall can be started immediately after pouring the lower concrete. The time required for pouring joint surfaces is shortened, which not only improves the quality of concrete, but also eliminates the need for raising and replacing beams, eliminates complications between different industries, and improves construction management. In addition to being advantageous, it also has the effect of significantly shortening the construction period compared to conventional methods. This is because it is no longer necessary to wait for the concrete of the inner wall to reach a predetermined strength, then replace it with a raised wall in the next step, and successively perform pouring of the inner wall concrete.

[Brief explanation of the drawing]

The figures are all related to the present invention and are used to explain the construction procedure, etc., and Figure 1 is a schematic side view showing the state in which the excavation has been completed and the belly is raised, and Figure 2 is a schematic side view showing the state in which the excavation has been completed and the belly is raised.
FIG. 3 is a plan view showing some details of the figure, FIG. 3 is an explanatory view showing the middle of construction, and FIG. 4 is a vertical sectional view showing the state in which the underground construction is completed. 1...Mountain retaining wall, 2...Horizontal, 3...Bracket, 4...Adjustment member, 5...Kirin jack,
6...flint beam, 7...inner wall.

Claims (1)

[Claims] 1. In earth retaining construction methods that use shoring such as struts and erecting for root cutting work, a detachable adjustment member is provided at the end of the erected side of the bracket, and the adjustment member and the erected are connected. to support the mountain retaining wall, and to the inside of the mountain retaining wall to such an extent that the adjustment member of the bracket can be removed later, and without having to separate from the belly raiser and replace the belly raiser, on the entire inside of the mountain retainer wall. A method for constructing an underground structure, which comprises placing concrete constituting an inner wall, and removing the raised part by removing the adjusting member of the bracket when the poured concrete has developed a predetermined strength. .