JP2001295275A - Timbering member and soil retaining timbering using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an easiness of execution by facilitating an installation and removal, reduce the quantity of timbering members less than that of an angle brace system, move the arrangement of shore struts nearer an axial force acting position in design, and surely develop the function as a timbering. SOLUTION: Horizontal members 8 and 9 are connected to each other through a plane generally triangular corner part piece 10 so as to form a timbering member formed into a plane T-shaped block body 7. By using the timbering member, the side face of the horizontal member 8 positioned at a T-shaped head part is connected to a waling 2, and shore strut 3 are connected to the tip of the horizontal member 9 positioned at a T-shaped lower end part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoring member and an earth retaining shoring using the same.

[0002]

2. Description of the Related Art Conventionally, there are, for example, a cut beam method, a fire beam method and the like as earth retaining supports for constructing an underground structure. As shown in FIG. 4, the cut beam method is a method of assembling a support frame with a bulge 2 and a cut beam 3 inside a retaining wall 1 constructed by a column-type underground continuous wall construction method. 1 to support the earth pressure.

[0003] In this case, the calculated span of the bulge 2 is the girder pitch, which is 3.0 m in the illustrated example. In addition, since only the cutting beam 3 is directly joined to the bulge 2, the member of the bulging 2 needs to have a cross-sectional performance necessary for stress calculation based on the traversing beam pitch. And the supporting weight per 3 m of the earth retaining wall 1 is W = 12.9 t.

[0004] In the fire beam method, as shown in FIGS. 5 and 6, in addition to the structure of the cut beam method, a fire beam 4 which is an oblique erection member is installed on the cut beam 3, and this fire beam is used. By the installation of 4, the calculation span of the bulge 2 becomes 2.0 m compared to the cut beam method, and can be reduced. In addition, the reduction of the calculation span has made it possible to reduce the member size or the number of installation steps of the bulging member 2.

By the way, if the ratio of the bending moment of the bulge 2 in the cut beam method is 1.00, the ratio of the bending moment in the fire beam method is 0.44.
Becomes Also, the number of installation steps of the bulge 2 is set to be two steps and two steps in the case of the cut beam method, but it is three steps in the case of the fire beam method. In the figure, reference numeral 5 denotes a channel material disposed between the upper and lower protruding portions 2, and 6 denotes an angle material for supporting the protruding portion 2.

[0006]

In the above-mentioned cutting beam method, since the number of steps for setting the bulge 2 is large, the bracket itself for supporting the bulge 2 needs to be large, and the support structure as a whole has a large structure. As a result, the overall clearance is reduced, and a problem may occur in the workability. In this respect, the blown beam method solves these problems. However, in addition to the cutting beam 3, the work of installing the fired beam 4 is required, and the workability is poor.

[0007] Further, if the bulges are vertically arranged in three stages, the height of the whole becomes high. Therefore, the point where the axial force acts on the design is regarded as a point. It is expected that the axial forces acting on the upper and lower tiers are different, and it is also possible that an axial force greater than the design value acts on the lower tiers.

An object of the present invention is to eliminate the disadvantages of the prior art, to facilitate installation and removal, to improve workability, to further reduce the number of supporting members as compared with the fired beam method, and to arrange the cut beams. It is an object of the present invention to provide a supporting member which can be brought closer to a designed axial force acting position and can surely exhibit a function as a supporting member, and a retaining member using the supporting member.

[0009]

In order to achieve the above object, according to the present invention, as a support member, a horizontal member is connected to a substantially T-shaped block body by connecting it with a substantially triangular corner piece. The gist of the present invention is that the T-shaped head is a joint with the protruding part and the T-shaped lower end is a joint with the cutting beam.

[0010] In addition, as the shoring support, a support member formed by connecting a horizontal member with a substantially triangular corner piece to form a flat T-shaped block body is used for the T-shaped head. The gist of the present invention is to join the side members of the located horizontal member so as to protrude, and to join the cutting beam to the tip of the horizontal member located at the lower end of the T-shape.

According to the first aspect of the present invention, the support member is formed of a T-shaped block body, and then is carried into a construction site, joined to the bulge, and a cutting beam is installed. Only, it is not necessary to separately install fire beams, etc., and the workability is good.

According to the second aspect of the present invention, by installing the supporting member formed on the block body, the calculation span of the bulging can be reduced to more than that of the fire beam method, and the member size of the bulging member can be reduced. Alternatively, the number of installation stages can be further reduced. Further, the arrangement of the cutting beams can be made closer to the designed axial force acting position.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a shoring member of the present invention and an earth retaining shoring using the same, FIG. 2 is a perspective view showing an embodiment of the shoring member of the present invention, and FIG. FIG. 7 is a longitudinal sectional side view showing an embodiment of a work member and an earth retaining shoring using the same, and the same reference numerals are given to the same components as those in the conventional example shown in FIGS. 4 to 6.

According to the present invention, a block member 7 as shown in FIG.
The block body 7 is composed of two horizontal members 8 and 9 made of H-section steel or the like, which are combined into a flat T-shape and connected with a high-strength bolt 11, and a T-shaped corner portion. A corner piece 10 having a substantially triangular shape in a plane is disposed on the side surface, and the corner piece 10 is fixed to the side surfaces of the horizontal members 8 and 9 with high-strength bolts 11.

The side of the transverse member 8 located at the head of the T-shaped block body 7 is protruded at the joint with the bulge 2 and the transverse member 9 located at the lower part of the T-shaped block body 7. The lower end was a joint with the cutting beam 3.

The transverse members 8, 9 and the corner pieces 10 can be used as standard products, respectively. As an example, the transverse member 8 is a 400 mm H-section steel having a length of 2000 mm. 9 is a 400 mm H-section steel with a length of 1000 mm.
Assemble 10 into the block body 7 in advance.

The size of the horizontal members 8 and 9 is an example as described above, and H-300, H-300,
H-350 and H-500 can be used, and various shapes and sizes can be manufactured by combining them. In addition, the pitch of the girder, the supporting weight, the ratio of the bending moment, the construction method of the retaining wall is also an example,
It is not limited to this.

Next, a description will be given of a shoring support using the block body 7. The retaining wall 1 is constructed by a column-type underground continuous wall method or the like, and two steps of bulging 2 are installed inside the retaining wall 1. The belly 2 uses, for example, a 500 mm H-section steel. In the figure, reference numeral 6 denotes an angle member supporting the belly 2 and reference numeral 5 denotes a channel member provided between the angle member 6 and the belly 2 and between the belly 2.

The block body 7 assembled in the factory is carried into the site by a vehicle, unloaded and unloaded, and the side of the horizontal member 8 of the block body 7 is brought into contact with each of the upper and lower ridges 2 and the high-strength bolt Fix with 11.

In this state, since the horizontal member 9 protrudes in the direction perpendicular to the bulge 2, the distal end of the beam 3 is fixed to the distal end of the horizontal member 9 with a high-strength bolt. If a jack is installed at the other end of the cutting beam 3 and the jack is pressurized, the cutting beam 3 is erected via the block body 7 between the opposing bulges 2 and the earth retaining work is completed. .

By installing the block body 7 in this way, the calculation span can be reduced to 1.4 m.
As a result, the member size or the number of steps of the belly member can be reduced. By the way, the bending moment of the belly 2 can be reduced to 0.22 when the bending moment of the cutting beam method is set to 1.00, and the number of installation steps can be reduced to two steps. Furthermore, the supporting weight per 3 m of the retaining wall 1 was also W = 11.8 t, and the ratio could be reduced to 0.91 as compared with the case where the weight of the girder method was 1.00.

[0022]

As described above, in the support member of the present invention and the earth retaining support using the same, the block body pre-assembled in the factory is fixed to the prow, and the cut beam is fixed to the block body. Since installation and removal are easy, the workability can be improved and the construction period can be shortened. In addition, the number of support members can be further reduced as compared with the fired beam method, and the arrangement of the cut beams can be closer to the designed axial force acting position, so that the function as the support can be reliably exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a shoring member of the present invention and an earth retaining shoring using the same.

FIG. 2 is a perspective view showing an embodiment of a support member of the present invention.

FIG. 3 is a longitudinal sectional side view showing an embodiment of a shoring member of the present invention and an earth retaining shoring using the shoring member.

FIG. 4 is a plan view showing a conventional girder type earth retaining support.

FIG. 5 is a plan view showing a conventional fire beam type shoring support.

FIG. 6 is a vertical sectional side view showing a conventional fire beam type shoring support.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Retaining wall 2 ... Uplifting 3 ... Cut beam 4 ... Fire beam 5 ... Channel material 6 ... Angle material 7 ... Block body 8 ... Horizontal material 9 ... Horizontal material 10 ... Corner piece 11 ... High strength bolt

Claims (2)

[Claims] 1. A cross member is connected to a flat T-shaped block by connecting it with corner pieces having a substantially triangular shape in a plane, and a T-shaped head is provided at a joint portion with the protruding portion and a T-shaped lower end. A support member characterized in that the portion is a joint with a cutting beam. 2. Using a support member formed by connecting the horizontal members with a substantially triangular corner piece in a plane to form a flat T-shaped block, the horizontal member located at the T-shaped head is used. A shoring support, characterized in that the side faces are flared and a cut beam is joined to the tip of a transverse member located at the lower end of the T-shape.