JPH04155010A - Construction method for retaining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an earth retaining method with excellent construction efficiency.

・T1 <Conventional technology> In temporary cofferdam and earth retaining work, countermeasures against earth shoring and water pressure are closed until shoring is installed.

For this reason, the ground between the retaining walls is currently being excavated and
The method used is to excavate to a predetermined depth by repeating the process of draining water and then horizontally erecting supports (struts) step by step between the retaining walls in a dry state.

<Disadvantages to be Solved by the Present Invention> The conventional earth retaining technology described above has the following problems.

<B> Excavation work, drainage work, and support erection work must be performed repeatedly, requiring a great deal of labor and time.

<Exposure> When retaining soft ground, large soil pressure and water pressure act on the retaining wall.

Therefore, auxiliary construction methods such as ground improvement are required, resulting in high construction costs.

<Object of the present invention> The present invention was made to solve the above-mentioned problems, and its purpose is to provide an earth retaining method with excellent workability.

<Means for solving the problem> That is, the present invention constructs earth retaining walls facing each other, excavates between the earth retaining walls while filling with muddy water, and connects a plurality of struts arranged in multiple stages with vertical pillars. This is an earth retention construction method in which shoring equipment connected in a shape is submerged in water and erected between earth retaining walls, and muddy water between the earth retaining walls is drained while the earth retaining walls are supported by the shoring equipment.

<Description of the present invention> The present invention will be described below with reference to the drawings.

<A> Shoring device FIG. 1 shows a shoring device 1 used in the present invention.

The shoring device 1 includes a plurality of struts 2 with a telescopic function arranged horizontally in multiple stages, a vertical column 3 connecting each strut 2 in the vertical direction, and an end of each adjacent strut 2. It is composed of an integral structure with a belly riser 4 whose parts are horizontally connected.

<Exposure> The strut 2 is made of steel, and a part thereof is configured so that its entire length can be controlled to expand or contract remotely using a hydraulic cylinder or a screw mechanism.

<C> Vertical column The vertical column 3 is made of a rigid material that not only functions to connect the struts 2 in the vertical direction, but also has the function of reinforcing the struts 2 when the overall length of the struts 2 becomes longer. .

<C> Stand-up The stand-up 4 is made of H steel or the like, and is fixed by welding or the like between the ends of the struts 2 spaced apart at regular intervals.

<Effect> Next, the construction method will be explained.

<B> Construction of earth retaining wall (Fig. 1) Construct earth retaining walls 5.6 facing each other.

The earth retaining wall 5.6 is constructed using a known construction method such as sheet pile, concrete wall, or column pile.

<Exit> Excavation (Fig. 1) Next, excavate the ground between retaining walls 5 and 6.

If excavation is carried out in a dry state, there is a risk that earth pressure or water pressure will act on the retaining wall 5.6, causing the retaining wall 5.6 to deform inward.

Therefore, in order to suppress the deformation of the earth retaining walls 5.6, the ground between the earth retaining walls 5.6 is excavated to a predetermined depth before being filled with muddy water 7 such as bentonite liquid.

<C> Submergence of shoring (Fig. 1) Shoring equipment 1 assembled three-dimensionally after excavation work is completed
Submerge it in muddy water 7.

At this time, each strut 2 is contracted so as not to collide with the retaining wall 5.6.

<2> Extension and drainage of struts (Fig. 2) Next, extend each group of struts at the same time and ground both ends to the retaining wall 5.6.

As a result, a plurality of two groups of struts are erected at once between the earth retaining walls 5 and between them.

The earth retaining wall 5 is supported by the shoring device 1.
．． Drain the muddy water 7 between 6 and complete the work.

<Other Embodiments 1> It is also possible to use a shoring device 1 in which the uprights 4 are omitted and a plurality of struts 2 and vertical columns 3 are assembled in a cross-shaped structure.

Alternatively, a strut 2 without a telescopic function may be used.

<Other Example 2> Figure 3 shows an example of application to underwater cofferdam construction.

The construction method of this embodiment is the same as that of the previously described embodiments.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<B> Conventionally, excavation work and shoring installation work were repeated alternately, but in the present invention, after the excavation work is completed, it is possible to erect the shoring system a with a plurality of struts at once.

Therefore, the construction period can be significantly shortened.

〈口〉 The soil and water pressure acting on the earth retaining wall can be supported by muddy water during excavation operations, and by shoring equipment in dry conditions.

Therefore, the conventional auxiliary method of reinforcing the surrounding ground with the weight of the vehicle becomes unnecessary, and construction costs can be reduced.

<C> Can be constructed close to existing structures.

(2) Can be constructed either on land or on water.

<E> Suitable for shoring during temporary coffering of steel pipe sheet pile foundations.

[Brief explanation of drawings]

Figure 1: Cross-sectional view of the earth retaining wall in an explanatory diagram of the present invention.
Figure: Cross-sectional view of the retaining wall at the end of the work j1 Figure 3: Description of another example applied to construction on water [
Light diagram [Figure 2 Figure 3

Claims (1)

[Claims] (1) Construct earth retaining walls facing each other, excavate between the earth retaining walls while filling them with muddy water, and submerge in water a shoring device in which multiple struts arranged in multiple stages are connected in a well-shaped manner with vertical columns. An earth retention method in which muddy water is drained between the earth retaining walls while the earth retaining walls are supported by shoring equipment.