JPH07305344A - Segment for continuous underground steel wall and method for constructing continuous underground steel wall - Google Patents

Abstract

PURPOSE:To shorten the time required to construct a continuous underground steel wall and to enhance the efficiency of construction. CONSTITUTION:Each segment 1 comprises a casing 11 in the form of a rectangular solid open on its upper and lower sides and concrete 2 filling the casing 11 and solidified. The casing 11 is formed by flange steel plates 7, 8 and web steel plates 9, 10, and male joints 4 are provided at the flanged side ends of one of the flange steel plates 7, 8 and female joints 3 that are configured to be capable of being coupled to the male joints 4 are provided at the flanged side ends of the other flange steel plate. The plurality of segments 1 are coupled together and arranged in vertical lines, and the lines of segments 1 are joined together by junction means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel continuous underground wall segment and a steel continuous underground wall segment used as a temporary earth retaining wall, a main body underground wall, an underground tank, a rigid foundation or an impermeable wall in construction work. It concerns the method of constructing the inner wall.

[0002]

2. Description of the Related Art A conventional continuous steel underground wall (sometimes abbreviated as "steel continuous wall") is constructed as follows.

(1) First, as shown in FIGS. 15 and 16, an excavator 19 is used to excavate a hole (excavation hole 13) from the ground surface 20 to a predetermined depth.

(2) Next, as shown in FIG. 17 and FIG. 18, a steel continuous underground wall element 21 (a box body made of a steel plate) is introduced into the excavation hole 13 by using a crane or the like (not shown). ) Is suspended. When the depth of the drill hole is large, multiple elements are connected by bolt connection and built.

(3) Finally, as shown in FIGS. 19 and 20, the underwater concrete 23 is poured into the element 21 using the tremie pipe 22. It should be noted that the term “concrete pouring” is generally used by those skilled in the art to describe that concrete is filled into a frame and solidified.

As a technique for constructing a continuous underground wall made of steel, there have been heretofore known JP-A-55-68921 and JP-A-55.
Japanese Patent Laid-Open No. 165320 and Japanese Utility Model Laid-Open No. 4-19076 have been proposed. All of these are methods of pouring underwater concrete to construct a continuous steel underground wall.

[0007]

However, the above-mentioned conventional technique has the following problems.

(1) Since the underwater concrete is poured by the tremie system, a lot of time and careful management are required.

(2) Since concrete is often placed in water and at a large depth, there is a problem in the concrete filling property in every corner of the element.

(3) Most of the water is muddy water, and since concrete is poured in the water, there is a problem in the adhesion between the concrete and the element (steel plate).

(4) Although concrete requires high fluidity, high fluidity concrete is expensive and therefore economically disadvantageous.

Therefore, an object of the present invention is to solve the above-mentioned problems, to provide a segment for a continuous steel underground wall and a method for constructing a continuous steel underground wall, which is excellent in construction efficiency and is also economical. It is in.

[0013]

The steel continuous underground wall segment of the present invention comprises a rectangular parallelepiped box body whose upper and lower sides are open, and concrete which is filled and solidified in the box body. The box body is provided with two flange steel plates arranged in parallel with each other at a predetermined interval, and slightly inward from both side ends of each of the two flange steel plates, across the two flange steel plates, 2 which are orthogonal to the two flange steel plates and are parallel to each other with a predetermined space
Each of the two flange steel plates has a male joint at the flange portion at one side end thereof, and the male joint at the flange portion at the other side end thereof. It is characterized in that it has a female joint having a shape capable of being combined with.

The method of constructing a continuous steel underground wall of the present invention using the segment for continuous steel underground wall of the present invention is as follows.
The segment is placed in position, then the second segment is placed on top of the first segment, then the first segment and the second segment are joined by joining means, and then the third segment A male or female fitting is coupled to the female or male fitting of the first segment to juxtapose the third segment with the first segment, and then a male or female fitting of the fourth segment to the second segment. Connecting with a female or male joint and mounting the fourth segment on the third segment to juxtapose the fourth segment with the second segment, and then with the third segment and the fourth segment. Is characterized in that the above is joined by a joining means.

[0015]

[Operation] By constructing a steel continuous underground wall segment consisting of solidified concrete and a steel box on the steel continuous underground wall at the construction site, concrete placing work becomes unnecessary and work time is reduced. It is shortened and construction efficiency is improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the embodiments shown in the drawings.

FIGS. 1 and 2 are drawings showing an embodiment of the present invention. FIG. 1 is a perspective view showing an embodiment of a steel continuous underground wall segment constituting a steel continuous underground wall, FIG. 2 is a plan view showing one embodiment of a steel continuous underground wall using the steel continuous underground wall segment of the present invention. Figure 1
As shown in FIG. 2 and FIG. 2, the steel continuous underground wall A has a plurality of precast steel continuous underground wall segments.
l wall = PCSW for short) (hereinafter referred to as "segment")
It consists of 1.

As shown in FIG. 1, the segment 1 is a box-shaped box body 11 whose upper and lower sides are opened, and a box body 1.
Precast concrete filled and solidified in 1
It consists of The box body 11 extends between the right flange steel plate 7 and the left flange steel plate 8 and the right flange steel plate 7 and the left flange steel plate 8 and is orthogonal to the two steel plates. Then, the left web steel plate 9 and the right web steel plate 10 are formed in parallel with each other with a predetermined gap therebetween.

Right flange steel plate 7 and left flange steel plate 8
A cylindrical female joint 3 is vertically provided on one side end protruding portion (flange portion). A slit 3a is provided outside the female joint 3 in the vertical direction.
On the other hand, male joints 4 are vertically provided on the other side end projecting portions (flange portions) of the right flange steel plate 7 and the left flange steel plate 8. The male joint 4 has a shape (T-shape in this embodiment) that can be fitted into the female joint 3, and the male joint 4 and the female joint 3 can be connected to each other. The segment 1 is manufactured in advance in a factory or the like. As shown in FIG. 2, by connecting the female joint 3 (or male joint 4) of one segment 1 and the male joint 4 (or female joint 3) of another segment 1, the segments 1 are joined together. As shown in FIG. 2, a plurality of segments 1 can be laterally juxtaposed in the drill hole 13. Reference numeral 6 denotes a hole wall of the excavation hole 13.

Next, the process of constructing a continuous steel underground wall using this segment will be described below.

(1) As shown in FIGS. 3 and 4, the segment 1a manufactured in the factory is hung by the crane 12 and built in the excavation hole 13.

(2) As shown in FIGS. 5 and 6, the segment 1a is fixed to a reaction force stand (not shown), the segment 1b is hung by the crane 12 and placed on the upper surface of the segment 1a, and then, , The segments 1a and 1b are joined by a joining means. This joining means is basically bolt joining, but welding joining is also possible depending on the situation. Details will be described later. In addition, the joint surface is waterproofed. This water stopping method will also be described in detail later.

(3) After the segments 1a and 1b are joined, they are built up to the bottom of the excavation hole 13 by the crane 12. Then, as shown in FIGS. 7 and 8,
After the segment 1c slides down the joint of the already installed segment 1b and descends, it is combined with the joint of the segment 1a and built up to the bottom of the excavation hole 13.

(4) The segment 1d is lowered by a crane, joined with the joint of the already installed segment 1b, and placed on the upper surface of the already installed segment 1c.
Next, the segments 1c and 1d are joined by the above joining means. This completes the construction of the steel continuous underground wall when four segments are used. Needless to say, the size of the segment may be adjusted or the number thereof may be increased or decreased according to the size of the drill hole and other conditions.

In the present invention, as shown in FIG. 2, since the male and female joints 3 and 4 form a gap 5 between the segments 1 and 1, the construction environment such as the depth of excavation and soil condition,
Depending on the work situation, known publicly known means, for example, a method of press-fitting cement milk into the void, a method of solidifying mud water (not pressurizing cement milk), or a method of solidifying mud water used for excavation, or water granulation The gap may be filled by a filling method or the like.

The above-described joining of the upper and lower segments in the depth direction (joining of the segments 1a and 1b, 1c and 1d, see FIG. 9) may employ the following welding joint and bolt welding means. . This will be described below.

(1) Welded joint: Segments having a groove are previously butt-welded together.

(2) Bolt welding: A bolt joint via a splicing plate; as shown in FIG.
The splice plates 14 are arranged on the inner and outer surfaces of the flanges 7 and 8 of the upper segment 1b and the flanges 7 and 8 of the lower segment 1a, which are arranged vertically in the depth direction, and the flanges are arranged on the inner and outer surfaces thereof. 7 and 8 and the contact plate 14 are joined by bolts 15 at several places.

Joint via bolt flange; FIG.
As shown in FIG. 5, bolt flanges 16 and 16 are preliminarily welded to the abutting portions of the flanges 7 and 8 of the upper segment 1b and the flanges 7 and 8 of the lower segment 1a, which are arranged vertically. And the upper and lower segments 1a, 1b
After they are abutted with each other, they are joined with bolts 15 at several places.

A joint through a ribbed bolt flange; as shown in FIGS. 13 and 14, the flanges 7 and 8 of the upper segment 1b and the lower segment 1 which are arranged above and below.
In each of the abutting portions of the flanges 7 and 8 of FIG.
Bolt flanges 18, 18 joined to 7, 17 are arranged in advance. Then, after the upper and lower segments 1a and 1b are butted, they are joined by bolts 15 at several places.

The water stopping method described above may employ the following means. This will be described below.

(1) A waterproof rubber is attached to the upper surface of precast concrete which constitutes a segment, and the segment is placed and joined from above on the waterproof rubber.

(2) The upper surface of the precast concrete which constitutes the segment is roughened in advance, and a mortar or cement milk-like material is applied on it.
A segment is joined on it from above.

[0034]

As described above, according to the present invention, unlike the conventional construction method, that is, the conventional technique of placing underwater concrete in the element and constructing the continuous steel underground wall, the factory is preliminarily used. By constructing the precast steel continuous underground wall segment manufactured in 1. above into the continuous steel underground underground wall, the following useful effects are brought about.

Since the underwater concrete placing work, which requires a very long working time, is not required, the period for constructing the continuous steel underground wall can be significantly shortened and the construction efficiency is improved.

Adhesion between concrete and steel plate, which is a problem in underwater concrete, is improved by using the segment of the present invention.

For the same reason as above, the filling property of concrete is improved.

Since there is no quality deterioration in muddy water, the quality problem of concrete is improved.

Conventionally, it has been necessary to use expensive concrete that is difficult to separate and has good fluidity as underwater concrete, but in the present invention, inexpensive ordinary concrete can be used, which is economically advantageous.

The number of personnel required for underwater concrete pouring work and pouring management can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a continuous precast steel underground wall segment that constitutes the continuous steel underground wall of the present invention.

FIG. 2 is a plan view showing one embodiment of the steel continuous underground wall of the present invention.

FIG. 3 is a cross-sectional view illustrating a process of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 4 is a plan view of FIG. 3 illustrating a process of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 5 is a cross-sectional view illustrating a step of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 6 is a plan view of FIG. 5 for explaining a process of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 7 is a cross-sectional view illustrating a step of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 8 is a plan view of FIG. 7 illustrating a process of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 9 is a cross-sectional view illustrating a step of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 10 is a plan view of FIG. 9 for explaining a process of constructing a continuous steel underground wall using the segment of the present invention.

FIG. 11 is a perspective view illustrating a bolt joint via a splicing plate.

FIG. 12 is a perspective view illustrating a joint via a bolt flange.

FIG. 13 is a perspective view illustrating a joint via a ribbed bolt flange.

FIG. 14 is a partial cross-sectional view of FIG. 13 illustrating a joint via a ribbed bolt flange.

FIG. 15 is a cross-sectional view illustrating a process of constructing a conventional steel continuous underground wall.

FIG. 16 is a cross-sectional view taken along the line AA of FIG. 15 for explaining a process of constructing a conventional steel continuous underground wall.

FIG. 17 is a cross-sectional view illustrating a process of constructing a conventional steel continuous underground wall.

FIG. 18 is a cross-sectional view taken along the line BB of FIG. 17 for explaining a process of constructing a conventional steel continuous underground wall.

FIG. 19 is a cross-sectional view illustrating a process of constructing a conventional steel continuous underground wall.

FIG. 20 is a cross-sectional view taken along the line CC of FIG. 19 illustrating a process of constructing a conventional steel continuous underground wall.

[Explanation of symbols]

 A steel continuous underground wall 1, 1a, 1b, 1c, 1d segment 2 precast concrete 3 female joint (flange) 3a slit 4 male joint (flange) 5 void 6 hole wall 7 right flange steel plate 8 left flange steel plate 9 left Web steel plate 10 Right web steel plate 11 Box 12 Crane 13 Drilling hole 14 Splicing plate 15 Bolt 16 Bolt flange 17 Rib 18 Bolt flange 19 Excavator 20 Ground surface 21 Element 22 Tremy pipe 23 Underwater concrete

Claims (5)

[Claims] 1. A rectangular parallelepiped box body having open upper and lower sides, and concrete filled and solidified in the box body, the box bodies being arranged in parallel with each other at a predetermined interval. Two flange steel plates, and slightly inward from both side ends of each of the two flange steel plates, across the two flange steel plates, orthogonal to the two flange steel plates, and at predetermined intervals in parallel with each other. It is formed by two web steel plates arranged apart from each other, and each of the two flange steel plates has a male joint at the flange portion at one side end thereof, and at the other side end thereof. A segment for a continuous underground wall made of steel, which has a female joint having a shape capable of being coupled to the male joint in a flange portion. 2. A method of constructing a continuous steel underground wall using the segment for continuous steel underground wall according to claim 1, wherein the first segment is arranged at a predetermined position, and then the second segment is formed. It is placed on the first segment, then the first segment and the second segment are joined by joining means, and then the male joint or female joint of the third segment is joined to the female joint or male of the first segment. Coupling a third segment in parallel with the first segment, then coupling a fourth segment male or female coupling to the second segment female coupling or male coupling, and connecting the fourth segment to the fourth segment. It is placed on a third segment and the fourth segment is juxtaposed with the second segment, and then the third segment and the fourth segment are joined. Characterized by joining the stage, how to build a steel underground diaphragm walls. 3. After attaching a water blocking rubber to the upper surfaces of the first segment and the third segment, the first segment and the second segment, and the third segment and the fourth segment are joined. The method for constructing a continuous steel underground wall according to claim 2. 4. Instead of attaching a water blocking rubber to the upper surfaces of the first segment and the third segment, the upper surfaces of the first segment and the third segment are roughened, and mortar is applied on the roughened surface. The method for constructing a continuous steel underground wall according to claim 2, wherein the first segment and the second segment, and the third segment and the fourth segment are joined together. 5. The method for constructing a continuous steel underground wall according to claim 4, wherein a cement milk-like material is applied instead of the mortar.