JPS5854125A - Construction method for continuous underground wall - Google Patents

Abstract

PURPOSE:To enable to build a continuous underground wall which is excellent in monolithical unity with a curing material, by a method wherein, after an expand shape steel, in which an expand metal is processed and formed in the shape of a shpae steel, is erected in an excavated ditch, the curing material in the excavated ditch is cured. CONSTITUTION:An expand shape steel 1, in which an expand metal is processed into a sectional H-shape steel, is erected in a digged ditch A, and concrete 3 is deposited into the digged ditch to build in order an underground continuous wall. In this case, reinforcing rods are secured through utilization of the mesh of the expand shape steel, and this causes increasing of monolithical unity with the concrete 3, which results in reinforcing the underground continuous wall.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for a continuous underground wall used as an earth retaining wall or a water-stopping wall. After constructing the concrete (called ``excavated underground wall'') into the excavated trench one after another, the hardened material in the excavated trench is hardened to construct a continuous underground wall.

Conventionally, H-shaped steel has been widely used for mountain retainers, etc., but the hardened material of Hatai Concrete Cape and the H-shaped steel have poor adhesion and are not integrated into rounded shapes, making it difficult to maintain continuity in the horizontal direction. It has some drawbacks such as lack of it.

This invention was developed to overcome the drawbacks of the conventional construction method, and will be explained below based on the illustrated embodiment.

Figures 5 and 6 show an example of an underground continuous wall constructed by the construction method of the present invention. Concrete 3 will be poured into this trench and an underground continuous wall will be constructed one by one.

In addition, when the depth of the underground wall is large, muddy water such as bentonite muddy water is usually used to stabilize the trench wall, but in that case, the concrete is placed using underwater concrete.

In addition to concrete, the hardening material used to form underground walls may be made of earth and sand mixed with a hardening agent. The expanded section steel l can be inserted into the fluidized or plasticized earth and sand, and after hardening, it can be integrated with the ground.

As mentioned above, the expanded steel section 1 is made by processing expanded metal into a section steel shape, including H-shaped cross sections,
A box shape, a double H cross section with multiple webs and seven upper and lower rungs, and a ladder-like cross section can be used.

Fig. 1 is a perspective view of an expanded section steel 1 formed to have an H-shaped cross section. As shown in Figs. 3 and 4, the steel plate is partially cut and stretched, and such expanded metal pieces are [It's 1.

In this embodiment, both ends of the web and the center and both ends of the 7 langes are left uncut and welded. The second figure in Figure 9 is a perspective view of an expanded steel section with a double H-shaped cross section.

FIGS. 7 to 9 show another method of manufacturing expanded band shaped steel, in which nine expanded band metals are processed into a groove shape and tied together with binding bands 4. @7wJ is formed by binding Kueps together to form an H-shaped cross section. You can also use steel in place of the cable ties.
0. It can also be processed by making cuts in the webs and flanges of thin-walled H-beam steel and stretching them.

In addition, in conventional underground A-walls, reinforcing bars for dicarbonate steel are attached to round steel that are built at predetermined intervals, but the normally used deformed reinforcing bars tend to stick in the muddy water of alms. It is generally 50~120c depending on the thickness of the reinforcing bar diameter.
A diameter of 100 mm is required.

On the other hand, the expanded section steel used in the present invention has a completely different attachment mechanism, and loads are transmitted by the shear stress of the concrete generated between the overlapping meshes. In addition, research on this adhesion mechanism has confirmed that sufficient continuity can be obtained with an overlap of about two meshes of air spand metal.

FIGS. 10 and 11 show an example in which reinforcing bars 5 are arranged, and the mesh of the expanded section steel 1 can be used to fix the reinforcing bars. The reinforcing bars 5 enhance integration with the concrete 3 and reinforce the underground continuous wall.

In addition to the above configuration, the present invention has the following advantages and features.

(D) Expanded steel sections are light in weight and easy to construct.

■ It has excellent integrity with the hardening material of concrete, so it becomes a vertical and horizontal RC board.

■ The required strength can be obtained by carbonizing the expanded steel plate thickness and the spacing as desired.

■ Steel material has a net I-shaped nine-way reinforcement arrangement and piled-up structure is harmful.

■ Must! A required number of reinforcements can be placed at one location, for example, at a location where the earth anchor is exposed to large flexures or shear, thereby further enhancing integration with the steel material.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figures 1 and 2 are perspective views of the expanded section steel used in this invention, and Figures f43 and 4 respectively show the method for manufacturing the expanded section steel. Front view WAijP and a cross-sectional view shown, Figure 5 is a cross-sectional view showing an example of an underground continuous wall constructed by the construction method of the Tono example, Figure 6 is also a longitudinal section 11i1N, and Figures 7-
Figure 9 is a cross-sectional view showing another method of manufacturing expanded section steel, Figure 11 is a cross-sectional view showing an example in which reinforcing bars are arranged, and Figure 11 is a vertical cross-sectional view. . M...Fist cut groove, 1...Extended band shape steel, 1 a-
m extract band part, lb-, non-extract band part, 2...
・Welded part, 3... Concrete, 4... Cable band, 5... Rebar. Figure 1 Figure 2 Figure 3 Figure 4 h Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] (1) Expanded steel sections made by processing expanded metal into section steel shapes are sequentially erected in an excavated trench, and then the hardened material in the excavated trench is hardened to form an underground wall. A continuous underground wall construction method characterized by: (2) The method for constructing a continuous underground wall according to claim 1, wherein the expanded steel plate is made by combining expanded steel plates that are partially cut and stretched. (3) The method for constructing a continuous underground wall according to claim 2, wherein the expanded section steel is formed by cutting seven upper and lower lunges of the expanded steel plate by 1 wIm on the expanded steel plate to form an H-shaped cross section. . (4) The air spunt section steel is made by binding the webs of a pair of expanded steel plates processed into a groove-shaped cross section with a binding band and joining them into an H-shaped cross section.
Continuous underground wall construction method as described in section. (6) The method for constructing a continuous underground wall according to claim 1, wherein the expanded section steel is processed by making cuts and stretching the web and seven lunges of a thin H section steel. (6) The continuous underground wall construction method according to claim 1 or 2, wherein the expanded section steel is formed into a box-shaped cross section. (7) The method for constructing a continuous underground wall according to claim 1 or ls 2, in which the expanded section steel comprises a plurality of webs spaced at predetermined intervals and seven upper and lower lunges. (8) Claims 1, 2, and 3, stripes 4, in which reinforcing reinforcing bars are arranged in the excavated groove together with expanded steel.
JJ, the method of constructing a continuous underground wall as described in Section 5, Section 6 or Section 7. (9) Claims 1 and 2, Atsushi 3, 4, and 5, Claims 6, in which the hardening material is concrete;
No. 711jt or the method of constructing a continuous underground wall according to claim 8 0 Q (I) The hardening material is earth and sand mixed with a consolidation agent. Section, Section 5,
A method of constructing a continuous underground wall according to item 6, 7 or #I8.