JPH0461925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention particularly relates to a method for constructing partition walls when forming partition walls in a perpendicular state between continuous underground walls.

≪Conventional technology≫ After surrounding the construction area with a continuous underground wall in a closed section,
A partition wall is constructed perpendicularly between the opposing inner surfaces of this continuous underground wall, and the two are connected to form a grid to create an underground concrete structure with increased rigidity, which is used, for example, in bridge foundations. ing.

When constructing a concrete structure with this type of structure, the inner surface of the continuous underground wall will be the joint with the bulkhead, so excavation trenches for bulkhead construction will be excavated, and the joint of the continuous underground wall will be With the exposed surface, it is necessary to scrape off any deposits such as concrete, solidified mud, earth and sand that have adhered to the exposed surface to increase the bonding strength between the two.

As a scraping method, the method shown in FIG. 7 or the method shown in FIG. 8 has conventionally been adopted.

In the former method, a bucket-type excavator 3 installed at the tip of an arm 2 supported on a trolley 1 is applied to the exposed surface of the preceding underground wall 4, and the arm 2 is operated while scraping along the wall surface. This is the way to drop it.

The latter method is a method in which a bucket type excavator 6 suspended from the tip of a wire 5 is raised and lowered along the vertical direction of the wall surface of the preceding underground wall 4 to scrape it off.

≪Problems to be solved by the invention≫ However, in the case of the former method, arm 2
Since it is not possible to increase the length of the wall, it is not possible to scrape off underground walls at great depths.

Furthermore, in the latter method, it is not possible to apply lateral pressure to the excavator 6, so it is not possible to apply sufficient force to the side surface, and the exposed surface is not necessarily in a smooth state.

Therefore, for example, when a protrusion 4a is present on the wall surface as shown in the figure, sufficient scraping cannot be performed.

For this reason, conventional methods of constructing partition walls have had the problem of not being able to ensure sufficient bonding strength with continuous underground walls.

This invention solves the above-mentioned problems, and its purpose is to make it possible to reliably and quickly scrape off deposits on the surface of a joint, even if the surface is uneven, in a deep underground wall. The present invention provides a method of constructing a partition wall in the middle of continuous ground, which provides sufficient bonding strength between the continuous underground wall and the partition wall.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention provides the following features: When forming a partition wall orthogonal to each other between the inner surfaces of a continuous underground wall by splicing: A guide fitting along the vertical direction is buried in advance at a position where the partition wall is to be constructed, and after excavating an excavation groove for constructing the partition wall and exposing the joint, a scraper is moved up and down along the guide fitting. The method is characterized in that a scraping jig is installed, and a plurality of cutting tools provided on the scraping jig are pressed against the surface of the splicing part to shape it, and then the partition wall is constructed.

≪Operation≫ By inserting the scraping jig into the guide fitting,
The cutter provided thereon comes into contact with the wall surface at a certain cutting depth, and is moved up and down to forcibly scrape off the deposits on the wall surface of the splice section.

As a result, the joint portion is shaped, and sufficient joint strength between the continuous underground wall and the partition wall can be ensured.

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

Figures 1 to 3 show the construction sequence of a method for constructing partition walls between continuous underground walls to which the present invention is applied.

In constructing the bulkhead, first, as shown in Figure 1, the ground on which the underground concrete structure was to be constructed was quite weak, so a continuous concrete underground wall B was constructed.
Before constructing the underground continuous wall B, a soil improvement wall A was constructed by curing a self-hardening stabilizing liquid with a cross-sectional area slightly larger than that of the underground continuous wall B to be constructed.

The soil improvement wall A was formed to the depth necessary for soil improvement and had a rectangular cross section.

Next, a continuous underground wall B having a narrower width than this is placed approximately on the center of the soil improvement wall A, and a panel upper wall body 10,
12 and 14 were successively installed, and the construction area was constructed in a closed cross-sectional shape so as to enclose the construction area in the shape of a rectangular frame.

Thereafter, the rectangular closed section surrounded by the continuous underground wall B was divided into two parts, and a soil improvement partition wall C was constructed by hardening the self-hardening stabilizing liquid.

After this, as shown in Fig. 2, an excavation groove 16 for constructing a narrower concrete partition wall 18 is excavated at the center position of the soil improvement partition wall C, and an excavation groove 16 is excavated at the joint part of the continuous underground wall B. Expose D.

When the joint part D is exposed, deposits such as concrete, solidified mud, earth and sand are scraped off along the vertical direction of the joint part D.

When the scraping is completed, a reinforcing bar cage is erected in the excavated trench 16 and concrete is poured, thereby constructing the partition wall 18 by dividing the center of the rectangular frame, thereby constructing an underground concrete structure. is completed.

In the above structure construction process, the method described below is used during the scraping.

[Preparation process for scraping] A guide metal fitting 22 is installed in advance on the reinforcing bar cage 20 of the wall body 14 at a position corresponding to the joining part D of the continuous underground wall B.
is fixed close to the inner surface of the continuous underground wall B.
buried within.

As shown in FIGS. 4 and 5, the guide fitting 22 includes a pair of support arms 26 whose one ends are supported by the reinforcing frame 24 of the reinforcing bar cage 20, and each support arm 2.
A guide fitting main body 28 having a U-shaped cross section held between the tips of the guide fittings 6 and a pair of ribs 30 that are integrated by welding or the like inside the tip opening of the guide fitting main body 28 and facing each other, and a pair of ribs 30 that are welded or the like between the ribs 30. It consists of a closing plate 32 made of a thin iron plate that covers the opening at the tip of the guide metal body 28, and a bottom plate (not shown) that covers the bottom surface of the guide metal body.

Rebar cage 2 equipped with guide fittings 22 configured as above
0 is built, even if concrete is poured, the concrete will not penetrate into the inside of the guide fitting main body 28, so the inside will remain empty, and only the surface will be filled with concrete, solidified mud, earth and sand. etc. will be attached.

[Exposure process] With the construction of underground continuous wall B completed by pouring concrete in this way, soil improvement partition wall C
, and the excavated trench 1 is perpendicular to the underground continuous wall B.
By excavating 6, the surface of the guide metal fitting 22 is exposed at the joining part D.

[Scraping process] After that, the scraping jig 34 is inserted into the guide metal fitting 22.

This scraping jig 34 is as shown in FIG.
A hanging block 36 that is slidably guided along the guide fitting 22, cutting tool holding pieces 38a to 38c arranged in three stages on a surface of the hanging block 36 facing the wall 14, A large number of chip-shaped cutting tools 40 are arranged at the tip of each piece 38a, 38b, wire brushes 42 are arranged above and below the top piece 38c, and a central tip of the second cutting tool holding piece 38b is arranged. It consists of a protruding wedge-shaped guide blade 44.

Here, the lowermost cutting tool holding piece 38a
The intervals between the blades 40 protruding from the tip of the blade are coarse;
The blades 40 protruding from the tip of the upper piece 38b are closely spaced, and each brush 4
Array 2 is densely packed.

Further, the tip of the guide blade 44 has a large diameter, and the large diameter portion 44a protrudes inward between the ribs 30, thereby making it possible to move the scraping jig 34 up and down along the guide fitting 22. There is.

In order to scrape off and shape the deposits adhering to the surface side of the guide metal fitting 22 using the scraping jig 34 configured as described above, first, the guide blade 44 is placed on the closing plate 32 made of a thin iron plate. If the scraping jig 34 is lowered while letting out the wire in the applied state, the closing plate 32 will be broken by the guide blade 44 due to the weight of the scraping jig 34 .

In the broken state, the large diameter portion 44a of the guide blade 44 is guided so as to be movable up and down inside the rib 30 provided on the front edge of the guide fitting body 28.

Then, the deposits adhering to the surface side of the guide metal fitting 22 are scraped off by the blade 40, and the deposits located between the edges of the respective blades 40 are scraped off by the brush 42 that protrudes in two upper and lower stages. It will be completely removed.

Therefore, the deposits on the surface side of the guide fitting 22 are completely removed, and in the subsequent pouring process, the concrete of the partition wall 18 wraps around the outer periphery and the inner space of the guide fitting 22.

In addition, in the above-mentioned example, the method of constructing the soil improvement wall A before constructing the continuous underground wall B and constructing the soil improvement wall C before constructing the partition wall 18 was illustrated,
The implementation of the present invention is not limited to this, and depending on the state of the ground, these ground improvements may not necessarily be necessary.

<<Effects>> As explained in detail through the embodiments above, according to the method for constructing a partition wall between continuous underground walls according to the present invention, by inserting a scraping jig into the guide fitting, The installed cutting tool comes into contact with the wall surface at a certain cutting depth and moves up and down to forcibly scrape off and shape the deposits on the wall surface of the joint, so it can cut at a greater depth than any conventional scraping method. To be able to reliably and quickly scrape off deposits on a splicing surface even if the wall is an underground wall and has irregularities on the surface.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams showing the construction order of the continuous underground wall construction method to which this invention is applied;
The figure is a plan view showing a reinforcing bar cage and a guide fitting provided thereon, Fig. 5 is an enlarged view of the guide fitting, Fig. 6 is a perspective view showing a scraping jig, and Fig. 7 is a conventional scraping method. FIG. 8 is a cross-sectional explanatory view showing another example of the conventional scraping method. 14... Wall body, 16... Excavation groove, 18... Partition wall, 20... Rebar cage, 22... Guide metal fitting, 34
... Scraping jig, 36 ... Hanging block, 4
0... Cutting tool, 42... Wire brush, A... Ground improvement wall, B... Underground continuous wall, C... Ground improvement bulkhead, D... Connection part.

Claims (1)

[Claims] 1. When forming a joint of a partition wall that intersects perpendicularly between the inner surfaces of a continuous underground wall: A guide fitting along the vertical direction is buried in advance at the position of the joint of the continuous underground wall. Then, after excavating an excavation groove for constructing the partition wall and exposing the joint, a scraping jig that moves up and down along the guide fitting is installed, and the scraping jig is A method for constructing a partition wall between continuous underground walls, characterized in that the partition wall is constructed after shaping the joint part by pressing a plurality of cutting tools provided thereon against the surface of the joint part. 2 The scraping jig includes a hanging block that is slidably guided along the guide metal fitting, and a cutting tool holding tool that is arranged in multiple stages on a surface of the hanging block that faces the continuous underground wall. piece, and a plurality of cutting tools arranged at the tips of each of these pieces, the cutting tools are arranged sequentially from the lower stage to the upper stage at intervals, and are densely arranged in a brush shape at the top stage. Characteristic claim 1
A method for constructing a partition wall between continuous underground walls as described in Section 1.