JPS62160314A - Construction work of continuous underground wall - Google Patents

Abstract

PURPOSE:To obtain an underground wall whose concrete is well adhered to master pile by a method in which chain materials are charged into the space in the surrounding of a master pile driven into a pit, and while the chain materials are pulled up, the ground between it and the master pile is excavated and soil on the surface of the master pile is removed by vertically moving the chain material. CONSTITUTION:In constructing a continuous underground wall, master piles 1 are driven into pits 3 excavated at a given interval, and chains 2 are charged into the surrounding of the piles 1. A solidifying agent 4 is then packed into the space between a flange 11 and the pit wall 4, the ground between the piles 1 is excavated by a bucket 7, etc., to form a trench 8. The chains 2 are pulled up as the excavation proceeds to avoid obstruction to the excavation. After the ending of the excavation between the piles 1, concrete is placed into the trench 8 to construct an underground wall. Soil adhered to the surfaces of the piles 1 is removed by vertically moving the chains 2 in order to improve the adhesion between the concrete and the piles 1.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves excavating between parent piles such as H-type piles and box-type piles, and pouring concrete into the excavated grooves to form a continuous concrete wall of 114 mm. This relates to the continuous underground wall construction method.

<Prior Art> There is a method of constructing a continuous underground wall using parent piles such as box piles and H-shaped piles.

In this construction method, a parent pile is first built into a hole created by filling the ground with muddy water such as hentonite liquid.

Next, mortar or the like is placed between the flange of the erected parent pile and the hole wall.

Furthermore, the space in the hole where the rib surface of the parent pile touches is filled with concrete, gravel, etc. to fix the parent pile.

Next, an excavation is made between the main piles, and concrete is continuously poured into the excavated groove to construct an underground wall.

Problems to be Solved by the Present Invention> The above-described method of constructing a pond wall has the following problems.

(b) When excavating between the parent piles, it is extremely difficult to excavate as close as possible to the parent piles.

Therefore, unexcavated earth and sand remains around the parent pile and is difficult to remove cleanly.

(b) Muddy water, poorly mixed mortar for fixing the main pile, silt mortar, etc. are attached to the area around the main pile.

Therefore, when pouring concrete into the trench formed between the main piles, it becomes difficult to integrate the main piles with the concrete.
The strength of the structure decreases.

OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The purpose is to provide an underground wall construction method.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

[Filler used in the present invention] In the present invention, the chain material 2 is used as a filler to be filled around the parent pile 1.

This chain member 2 may be a known hard or soft member formed by connecting a large number of small rings.

[Construction method] <1> Perforation Holes 3 are opened at predetermined intervals in the construction direction of the pond wall.

2〉Erecting the main pile Next, the parent pile 1 is erected into this hole 3 using a crane or the like.

3> Inserting chain material (Fig. 1.2) Next, chain material 2 is introduced around the main pile 1 to fix the main pile 1.

Further, a consolidating material 4 such as concrete or mortar is filled inside the box-shaped main pile 1 and between the outer surface of the flange 11 and the hole wall.

When adding the chain material 2 and filling the consolidation material 4 in parallel, insert the chain material 2 so that the top of the chain material 2 is always higher than the top of the consolidation material 4. Then, the stability of the main pile 1 can be ensured.

Furthermore, even if the consolidation material 4 is filled between the flange 11 surface of the parent pile 1 and the hole wall, the presence of the chain material 2 on the rib 12 surface prevents the consolidation material 4 from going around.

4> Cutting between the main piles (Fig. 3) After completing the insertion of the chain material 2, cut the space between the main piles 1 with a packet 7 or the like to form the cut groove 8 without filling with muddy water 5.

During this excavation work, so that the two layers of silver material are located at a position lower than the bottom surface of the excavation groove 8 so as not to become an obstacle to the excavation.
The chain members 2 are sequentially pulled up as the excavation progresses.

Therefore, excavated soil and the like that have entered the inside of the chain material 2 can be easily discharged by pulling up the chain material 2.

Further, when the chain material 2 is pulled up, the unevenness of the chain material 2 removes deposits such as mortar and earth and sand adhering to the outer surface of the parent pile 1 and the periphery of the parent pile 1.

5> Casting concrete Once the excavation between the main piles 1 is completed, concrete is poured into the excavated groove 8 to construct the underground wall 6.

By raising and lowering the chain members 2, the external surface of the parent pile 1 and its surroundings are cleanly removed, so that the cast concrete and the parent pile 1 are well adhered to each other.

Therefore, an underground wall in which the concrete and the parent pile 1 are firmly integrated can be constructed without mixing of muddy water 5, poorly mixed mortar, etc. as in the conventional case.

Other Examples> In the above embodiments, the case where a box-shaped main pile 1 is used has been described, but it is of course also possible to use a main pile 1 made of H-shaped steel.

In the case of this embodiment, as shown in FIG. 4, penetrating reinforcing bars 7 are arranged on the rib surface of the parent pile 1 during construction.

Further, an isolation member 9 may be placed at the boundary with the underground wall 6 constructed by pouring concrete.

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

(b) By bringing the silver material in and out of the hole in close contact with the parent pile, dirt, poor mix mortar, etc. adhering to the outer surface of the parent pile and its surroundings can be thoroughly removed.

Therefore, the adhesion between the concrete placed in the trench and the parent pile is improved, and the reliability of the constructed underground wall is improved.

(b) Unlike gravel, silver materials do not need to be disposed of once used, and can be reused.

(c) Since a silver material having continuity is used, it is easy to insert and remove the silver material.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of the construction method according to the present invention. Figure 2: An explanatory diagram when adding silver material.

Claims (1)

[Claims] After erecting parent piles in holes opened at predetermined intervals and fixing them by inserting chain members around the parent piles, excavation is performed by cutting between the parent piles while pulling up the chain members. A continuous underground wall construction method characterized by forming a trench and pouring concrete into the trench to construct an underground wall.