JP2004076490A - Earth retaining member of trench and earth retaining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth retaining method capable of solving such a problem that a shore strut is set in two stages for conventionally making the shore strut interfere when a pipe is hung down to the inside of a trench and that the construction of the pipe takes labor and time since the pipe is hung down to the bottom of the trench while changing the construction of the shore strut every stage. <P>SOLUTION: Two posts 11 and an underlayer 20 are connected to form a U-shaped frame in advance, the trench 2 is excavated along a piping line, the U-shaped frame is set inside the trench so that the posts 11 can approach both walls of the trench, a joint section between the posts 11 and the underlayer 20 increases rigidity of the U-shape frame by a pint wedge 13, and an earth retaining plate is set between the posts of the adjoining U-shaped frames along the trench side wall to carry out earth-retaining work. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a trench retaining member and a method for retaining a trench used for excavating a trench for laying a pipeline in the ground, for example.
[0002]
[Prior art]
When a trench is excavated for laying a pipeline in the ground, earth retaining is applied to the side wall to prevent collapse of the side wall. Conventionally, as shown in FIG. 6, a trench 2 is excavated along a pipeline for laying a pipe 50 to be buried in the ground, and a lightweight steel sheet pile is formed so that the ground on both side walls 3 of the trench 2 does not collapse. 101 is erected on the side wall of the trench, the bulges 102 for holding the lightweight steel sheet pile 101 are arranged substantially horizontally on the surface of the lightweight steel sheet pile 101, and the trench 2 is formed using a large number of cut beams 103 which stretch the bulges 102 on both side walls. Earth retaining of the side wall 3 is performed.
[0003]
[Problems to be solved by the invention]
In the conventional earth retaining method, not only does it take time to install the lightweight steel sheet pile 101, the bulge 102, and the cutting beam 103, but also when the pipe 50 is suspended in the trench 2, the cutting beam 103 becomes an obstacle. The cutting beams 103 are installed in two steps, and the pipes 50 are hung down at the bottom of the trench 2 while changing the cutting beams 103 for each step, and it takes time and effort to lay underground piping. .
[0004]
As a technique for improving such a technique, eliminating the use of the cutting beam 103 and improving the efficiency of work, U.S. Pat. Since this U-shaped support is an integral structure made by bending an H-section steel into a U-shape, it can support the steel sheet piles on the side walls without the need for cutting beams, but when removing the U-shaped support In U.S.A., the U-shaped support is lowered in the pipe length direction, lifted by a heavy machine from the gap between the retaining plate and the pipe while passing under the pipe, and carried to the ground surface. Therefore, at the time of removal, heavy U-shaped supports are lifted from the gap between the earth retaining plate and the pipe body, so that heavy equipment is required and the width of excavation of the trench needs to be widened.
[0005]
An object of the present invention is to provide a new technology obtained by improving such a conventional technology.
[0006]
[Means for Solving the Problems]
The present invention has been developed in order to solve the above-mentioned problems, and its technical means includes a column opposed in the width direction of the trench, and a detachable lower beam connecting the base of the column, A soil retaining member for a trench, comprising a rigidity-imparting member for imparting rigidity to a joint portion between the trench and the lower beam.
[0007]
In this case, the lower beam is a plate material having wide portions at both ends, a pillar is provided with a flange that is in contact with the wide portion, and the wide portion and the flange are provided with holes for pin connection, and the wide portion and the side wall of the support are provided. It is preferable to use as an earth retaining member for a trench having a gap into which a wedge is driven. As the stiffness imparting member, for example, a wedge or the like driven into a gap between the end of the lower beam and the support can be used.
[0008]
In the earth retaining method of the present invention, a column and a lower beam are joined in advance to form a U-shaped frame, a trench is excavated along a laying pipeline, and the U-shaped frame is attached to both walls of the trench. Installed in the trench so that they are close to each other, a stiffening member is attached to the joint between the column and the lower beam to increase the rigidity of the U-shaped frame, and then between the columns of the adjacent U-shaped frame along the trench side wall. An earth retaining method for a trench, comprising installing an earth retaining plate and performing earth retaining. According to this method, since the earth retaining can be performed without using the cutting beam, it is extremely easy to lay the pipe in the trench, and by disassembling the joint between the post and the lower beam after the laying, The lower beam and the pillar can be easily removed, and the retaining plate can be easily removed. Therefore, the underground pipe laying work can be carried out labor-saving in a short construction period.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a trench 2 showing an earth retaining member 10 according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. The column 11 is erected in contact with the side wall surface of the trench 2, and a lower beam 20 connecting the left and right columns 11 is coupled to the base of the column 11. The lower beam 20 is a flat plate having a wide portion 23 wider than the central portion 21.
[0010]
FIG. 3 is a side view showing the support 11 alone, and a plan view thereof is shown in FIG. The strut 11 has a driving blade 12 at the lower end, and a flange 15 is laterally extended at the base. In addition, locking portions 14 having an L-shaped cross section are provided on both side surfaces of the column 11 over the entire length in the longitudinal direction. The end of the earth retaining plate 31 is locked to the locking portion 14 as shown in FIG. The extension flange 15 is provided with a pin hole 16. In the embodiment, the lower beam 20 shown in FIG. 5 is a flat steel plate, has a wide portion 23 wider than the center portion, and is provided with a pin hole 22.
[0011]
The support 11 and the lower beam 20 are joined by aligning the pin holes 16 and 22 and driving a pin 24 into each other. The wedge 13 is driven into a gap between the side surface of the support 11 and the end of the wide portion 23 of the lower beam 20. By the interaction with the wedge 13, the joint between the column 11 and the lower beam 20 is rigidified and fixed. Therefore, the pillar 11 and the lower beam 20 form a U-shaped frame, support the collapse of the side wall of the trench without requiring a cutting beam, and maintain the shape of the trench.
[0012]
In the present invention, since the earth retaining member has a rigid U-shape, a cutting beam is not required, and when hanging the pipe in the trench, the trouble of changing the cutting beam is not required, and the work labor and time are reduced. Can be shortened. Further, if the wedge 13 and the pin 24 are removed, the support and the lower beam can be easily separated, and since the lower beam 20 has a plate shape, the gap between the earth retaining plate 31 and the pipe 50 is removed when the earth retaining is removed. Even when the part is narrow, it can be easily removed. Therefore, it is not necessary to widen the excavation width of the trench 2, and it is sufficient to set the excavation width to the minimum.
[0013]
According to the present invention, by installing a wedge as a member for imparting rigidity to the joint between the column and the lower beam, it is possible to stabilize the earth retaining according to the excavation situation.
[0014]
By arranging the steel plate of the lower beam 20 so that the surface is vertical, it becomes easy to drive the column 11 and the lower beam 20 into the bottom surface of the trench 2, so that the installation height of the column 11 can be easily adjusted. Become. In addition, since the lower beam 20 is formed in a plate shape, the height of the lower beam 20 becomes higher, the bending rigidity of the retaining member 10 in the vertical plane of the U-shaped frame is large, and the rigidity of the joint between the support 11 and the lower beam 20 is secured. It is easy. In addition, it is only necessary to perforate the steel plate itself without the need for attaching another member for providing the joint pin hole. In addition, by preparing a plurality of lengths of the lower beam 20 according to the width of the trench 2, the pillar 11 can also be used for excavating a plurality of trenches 2 having different widths. In addition, by changing the shape of both ends of the lower beam 20, the columns 11 on both sides can be formed in a U-shape in which the upper side is opened instead of being vertical. By driving the wedge 13 into the gap between the support 11 and the end of the lower beam 20, the connection between the support 11 and the lower beam 20 can be easily made to be a rigid and rigid connection. Therefore, it is possible to easily obtain a rigid connection in which the formed U-shaped frame is completely prevented from being deformed. If the wedge 13 is attached to the column 11 or the lower beam 20 by a bean chain or the like, there is no risk of loss. Instead of the driving wedge 13, a screw wedge, a push bolt, a screw jack, or the like may be used. The wedge 13 is driven into the gap between the support 11 and the lower beam 20, and is also driven into a hole provided in a flange or a bracket attached to the lower end of the support 11 and a bite hole provided near the lower beam end. It may be of the wedge or tapered pin type.
[0015]
The method for retaining a trench according to the present invention includes:
(B) The support and the lower beam are joined in advance to form a U-shaped frame. (B) A trench is excavated along the laying pipe. (C) The U-shaped frame is formed so that the support is close to both walls of the trench. Installed in the trench,
(D) Attach a rigidity-imparting member to the joint between the column and the lower beam to increase the rigidity of the U-shaped frame.
(E) An earth retaining plate is installed between pillars along the trench side wall to perform earth retaining.
[0016]
Therefore, it is possible to save labor and improve workability without the need for a large number of lightweight steel sheet piles, uprights, and cutting beams.
[0017]
【Example】
The present invention was applied to underground installation of a steel pipe having a diameter of about 400 mm. The dimensions of the trench are about 1 m in width and about 2 m in depth. The strut was a square steel □ -150 mm × 80 mm, and an L-shaped steel L-40 mm × 40 mm for guiding the earth retaining plate was welded to the left and right along the square steel. The piercing portion has a shape in which a steel plate having a sharp end is attached and easily installed in the trench. The lower beam 20 was formed by perforating a hole 22 for joining to a column in a steel plate having a thickness of 19 mm. Further, as shown in FIG. 1, a wedge 13 was driven into a gap between an end portion of the lower beam 20 and the column 11 to provide rigidity to a joint between the column 11 and the lower beam 20.
[0018]
Using this soil retaining member, the underground pipe was laid by the above soil retaining method. As a result, according to the present invention, it was possible to shorten the construction period and reduce the cost as compared with the related art.
[0019]
【The invention's effect】
According to the present invention, the base of the column is connected by the lower beam, rigidity is given to the joint, and the earth retaining plate is fixed to the column by retaining the earth retaining plate. It becomes unnecessary. Therefore, even when the pipe is hung in the trench, since there is no beam crossing the trench, the pipe can be hung without any trouble and the working time is shortened. Since the support and lower beam are pin-joined, installation / removal work is possible in a short time. When removing the lower beam after hanging the pipe, the lower beam is plate-shaped and lightweight, so even if the gap between the retaining plate and the pipe is narrow, it can be easily removed. It is. The pillars and lower beams can be easily installed in the excavation trench using heavy equipment.Furthermore, the earth retaining plate installed between the pillars drops down along the trench side wall, so that it can be easily and quickly installed. It is possible to do earth retaining.
[0020]
As described above, the present invention facilitates installation and removal work of earth retaining devices and can shorten the time, and can also shorten the time for hanging down pipes, shortening the construction period of underground piping work and cost reduction. It has an excellent effect that can be expected.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a trench showing an earth retaining member of an embodiment.
FIG. 2 is a plan view of FIG.
FIG. 3 is a side view of a column.
FIG. 4 is a plan view of a column.
FIG. 5 is a side view of a lower beam.
FIG. 6 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground 2 Trench 3 Side wall surface 10 Earth retaining member 11 Post 12 Driving blade 13 Wedge 14 Locking part 15 Flange 16 Pin hole 20 Lower beam 21 Central part 22 Pin hole 23 Wide part 24 Pin 31 Earth retaining plate 50 Pipe 101 Light-weight steel sheet pile 102

Claims (3)

A strut facing the width direction of the trench, and a detachable lower beam connecting the base of the strut, comprising a rigidity imparting member for imparting rigidity to a joint between the strut and the lower beam. Earth retaining material for trench. The lower beam is a plate material having a wide portion at both ends, a pillar is provided with a flange which is in contact with the wide portion at the surface, and the wide portion and the flange are provided with holes for pin connection and between the wide portion and the side wall of the support. 2. The trench retaining member according to claim 1, wherein a gap into which the wedge is driven is provided. The support and the lower beam are joined in advance to form a U-shaped frame, and a trench is excavated along the laying pipeline, and the U-shaped frame is inserted into the trench such that the support is close to both walls of the trench. Installation, a stiffening member is attached to the joint between the column and the lower beam to increase the rigidity of the U-shaped frame, and then a soil retaining plate is installed between the columns of the adjacent U-shaped frame along the trench side wall, An earth retaining method for a trench, characterized in that the earth is fixed.

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