JPH0444520A - Timbering construction of retaining wall - Google Patents

Abstract

PURPOSE:To make it possible to carry out easily construction work of a retaining wall by connecting continuously the upper end of the retaining wall in a state to have a small quantity of insertion to the inside of the retaining wall with a series of concrete barn members as a unit. CONSTITUTION:A sheet pile 1 as a retaining wall is driven into a specific section. Then, after concrete 4 is laced between external and internal forms 8 and 9 to cure and solidify, the external and internal forms 8 and 9 are removed, a series of RC concrete beam members 2 are connected continuously to the whole perimeter of the upper end of the sheet pile l as a unit, and a large working opening 3 is formed on the circumferential surface of each of the concrete beame members 2. After such a timbering construction of the retaining wall is constructed, a space surrounded by the sheet pile l is cut and excavated through the large working opening 3, and the foundation and basement of a building are constructed.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention is applicable to the construction of building foundations and basements, while the lateral pressure such as earth pressure and water pressure from the ground around the root cutting area is borne by a retaining wall. Regarding the supporting structure of the retaining wall for proceeding with the cutting work.

<Prior Art> The following are conventionally known as support structures for this type of retaining wall.

A. First conventional example A retaining wall made of sheet piles or the like is driven into the periphery of the site, and supporting piles for slabs such as H-shaped steel are driven into predetermined locations inside the retaining wall, and primary excavation is performed to a predetermined depth to create concrete. Form the pouring surface, erect a raised wall on the inner circumferential surface of the retaining wall, and erect a strut, leaving a predetermined location such as the center area formed by the strut as an opening for work, and opening in other parts. Reinforcement was placed and the slab was poured.

B. Second Conventional Example As shown in the schematic plan view of FIG. The flint beams 04 were erected, and horizontal supports 05 were assembled while arranging the flint beams 04 so that they were mutually compressed, and a large working opening 06 was formed in the center.

<Problems to be Solved by the Invention> However, each of the cylinder 1 and the second conventional example had the following drawbacks.

a. Disadvantages of the first conventional example In order to withstand lateral pressure such as earth pressure and water pressure from the retaining wall, the number of struts is increased, the working opening is small, and the amount of concrete placed is large, making it uneconomical. In addition, secondary excavation must be performed through a small working opening, resulting in a reduction in workability for secondary excavation.

b. Disadvantages of the second conventional example Although a large working opening can be formed and workability for secondary excavation can be improved, the connection point between the horizontal supports 05 and 05 becomes a bending point, and soil from the retaining wall The stress associated with supporting lateral pressure such as pressure and water pressure is concentrated at the bending point and easily damaged, requiring precision in the placement of the flint beams 04..., and the erection work and horizontal support of the flint beams 04... 05...
The disadvantage was that the assembly required time and effort, increasing the period of work required for retaining the mounts.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to increase the area of a work opening for excavation into a retaining wall and to facilitate construction of a retaining wall. The purpose is to

<Means for Solving the Problems> In order to achieve the above-mentioned purpose, the support structure for a mountain retaining wall of the present invention extends over the entire circumference of the upper end side of the mountain retaining wall driven into a predetermined section. It is constructed by connecting a series of concrete beams with a small amount of penetration into the inside of the wall.

The above-mentioned concrete beam material may be either RC construction or SRC construction.

According to the configuration of the support structure for the mountain retaining wall of the present invention, the stress associated with supporting lateral pressure such as earth pressure and water pressure from the mountain retaining wall can be reduced.
The compressive force in the axial direction is transmitted from the retaining wall to the concrete beam connected to its upper end, and the compressive force in the axial direction can be well supported by the tensile force of the concrete beam itself.

<Example> Next, an example of the present invention will be described in detail based on the drawings.

■ Figure 1 is a plan view showing the first embodiment, Figure 2 is a cross-sectional view of the main part (there is an enlarged cross-sectional view along the ■-■ line of the first embodiment, and the building is constructed on the ground G , Sheet piles l as retaining walls are divided into predetermined areas and driven, and the upper end side of the sheet pile 1 protrudes from the surface of the construction ground G, and a series of concrete beams 2 are placed over the entire circumference of the upper end side. are integrally connected to form a support structure for a retaining wall having a large working opening 3 in a space surrounded by sheet piles 1.

Concrete beam material 2 has reinforcing bars 5 in concrete 4...
- It is constructed of RC construction with embedded hoop reinforcements 6.

Next, the procedure for constructing the support structure for the retaining wall will be explained.

■ As shown in FIG. 3(a), drive sheet piles l as retaining walls into predetermined sections.

■ Thereafter, as shown in FIG. 3(b), the stand connectors 7 are connected to the upper end of the sheet pile l at a predetermined interval in the circumferential direction by welding or the like, so that they span both sides with the sheet pile 1 in between. Reinforcement bars 5... and hoop reinforcements 6 are arranged, and an inner formwork 8 is installed at a position slightly inward from the sheet pile 1, and a predetermined interval is placed with respect to the inner formwork 8. An outer formwork 9 is installed at a separated outer position.

■ After that, as shown in Fig. 3 (C), concrete 4 is poured between the inner and outer formworks 8.9, and after curing and hardening, the inner and outer formworks 8.9 are removed, and the sheet pile A series of RC concrete beams 2 are integrally connected over the entire circumference of the upper end side of the concrete beams 1, and a large working opening 3 is formed on the inner peripheral surface side of the concrete beams 2.

■ After constructing the support structure for the retaining wall as described above, as shown in Fig. 3(d), the space surrounded by the sheet piles 1 is cut and excavated through the large working opening 3;
Build foundations and basements for buildings.

For example, the concrete beam material 2 is 20m x 20m.
When driving sheet pile 1 in the section, the thickness is 10
It is sufficient to set the width to approximately 1 m. When root cutting work was carried out by applying this support structure of a retaining wall to soft ground, it was clear that the work could be carried out in an extremely stable state up to a depth of about 5 to 6 m.

1st actual ship■ Figure 4 is a cross-sectional view of the main parts of the second embodiment, and
The differences from the embodiment are as follows.

That is, the concrete beam material 2 is made of SRC construction in which H-shaped steel 10 is embedded in concrete 4 in addition to reinforcing bars 5 . . . and hoop reinforcing bars 6. The other configurations are the same as those in the first embodiment, and the explanation will be omitted by assigning the same numbers.

According to this second embodiment, compared to the first embodiment,
There is an advantage that the width of the concrete beam 2 can be shortened, and it can be suitably applied even when the distance between the outer circumference of the site and the outer circumferential surface of the building to be constructed is short.

In the first and second embodiments described above, the amount of penetration of the concrete beam 2 into the sheet pile 1, that is, the length of the concrete beam 2 protruding inward from the inner surface of the sheet pile 1 is, for example, 20 m× If the sheet pile 1 is to be driven in a 20 m section, approximately 20 to 30 ai will be sufficient.In short, the length will be equivalent to 1 to 1.5% of the longitudinal length of the sheet pile 1. You just have to let it in.

The retaining wall is not limited to one formed by driving sheet piles 1 as described above, but may also be formed by driving soil pile, for example.

According to the present invention, the stud connector 7 in the first and second embodiments described above may not be provided.

<Effects of the Invention> According to the support structure of the mountain retaining wall of the present invention, the stress associated with supporting the lateral pressure such as the earthen wall and water pressure from the mountain retaining wall can be transferred to the upper end of the mountain retaining wall in a state where the amount of penetration into the inside of the mountain retaining wall is small. Since it is well supported by connected concrete beams, there is no need to install beam materials such as cut beams or flint beams, or support members such as support piles within the retaining wall, and the structure of the support structure This has made it possible to easily construct retaining walls without the need for primary excavation.

In addition, since a large working opening can be formed within the retaining wall, excavation work within the retaining wall can be carried out efficiently, improving the construction efficiency of retaining wall construction work and subsequent building construction work. It has become possible to shorten the construction period.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the support structure for a retaining wall according to the present invention, FIG. 1 is an overall schematic plan view, and FIG.
The figure is an enlarged cross-sectional view taken along the line ■--■ in FIG. 1. FIG. 3 is a schematic cross-sectional view illustrating the procedure for constructing the supporting structure of the retaining wall. FIG. 4 is a cross-sectional view of the main parts of a second embodiment of the support structure for the retaining wall. FIG. 5 is a schematic plan view of a conventional example. l... Sheet pile as a retaining wall 2... Concrete beam material

Claims (3)

[Claims] (1) The upper end side of the retaining wall driven into a predetermined section is integrally connected with a series of concrete beams over the entire circumference, with a small amount of penetration into the inside of the retaining wall. Support structure for retaining walls. (2) The concrete beam material according to claim (1) is R
The supporting structure of the mountain retaining wall is C construction. (3) The concrete beam material according to claim (1) is S
The supporting structure of the mountain retaining wall is made of RC.