JPS6221926A - Sheathing work for excavated trench - Google Patents

Abstract

PURPOSE:To enlarge working space for the bottom of a trench by a method in which a spacer is fixed to the intermediate body of sheet piles erectly provided to both walls of the excavated trench, and the interval between the upper ends of the sheet piles is contracted to expand the lower end of the sheet piles. CONSTITUTION:A trench 2 is excavated in the ground 1 by an excavator, and sheet piles 4 are erectly provided along both walls 2a of the trech 2. Waling material 5 are fixed along the connecting direction of the sheet piles 4 and a spacer 7 is fixed between the waling materials 5. A shrinking beam 8 is fitted into the upper ends of the piles 4 and is allowed to contract, whereupon the lower ends of the piles 4 are extended outwards to enlarge the working space near the bottom 2b of the trench 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an earth retaining method for an excavated trench, and in particular, in order to prevent the wall of a trench excavated by an excavating device from collapsing, it is necessary to construct a trench from the ground without entering the excavated trench. This invention relates to an earth retaining method in which a sheet pile is erected along a wall, and a spacing member is interposed and fixed to the sheet pile in the width direction of a groove.

Conventional technology In general, lightning, faith, 'm, talking cables that surface sewer.

In construction work to bury gas pipes and other conduits underground, an open trench is excavated in advance, and the pipe is laid from above this open trench to the bottom of the trench.
Backfill with excavated soil and bury. The width of the opening is usually 60~
The trench walls are 90 cm long and about 1,500 cm deep, but because the walls are often made of soil, they tend to collapse easily, and it is dangerous for workers to work inside the trenches, so measures were taken to prevent the walls from collapsing. Earth retaining work will be carried out to prevent this. This earth retention work is
Sheet piles or boards along the groove walls! Drive it in and set it up,
In addition, this was accomplished by applying the raising material to the sheet pile in the same direction, and interposing and fixing a spacing member (strut) such as a tube that can be expanded and contracted in the width direction of the groove between the raising materials. For this reason, in order to sufficiently resist the earth pressure of the trench walls, a large number of spacing members are used, and a large number of load-bearing materials are interposed in the trench. Ding was in trouble.

Furthermore, in this type of construction, it is prohibited for the client (for example, Nippon Denki M'FI Corporation, etc.) to have workers enter the trench to perform various tasks in order to prevent personal injury. In many cases, all pipeline burying work must be done from above the trench.

Problems to be Solved by the Invention However, according to the above-mentioned conventional technology, sheet piles, etc. must be driven into the groove bottom at least in order to prevent the groove walls near the groove bottom from collapsing. Therefore, it is necessary to hammer in the upper end of the sheet pile. Moreover, in order to prevent the driven sheet piles from collapsing and to resist a predetermined earth pressure, it is necessary to interpose and fix a large number of spacing members between the sheet piles via lifting members. Moreover, these operations must be performed from above the groove, that is, until the work M enters the groove.
Work efficiency is not good. Even when the protection pipe with the cable inserted is laid at the bottom of the groove, there are many spacing members in the width direction of the groove, so it is difficult to insert the protective pipe into the groove that is laid in the longitudinal direction of the groove. The work of placing it on the bottom of the groove is troublesome and requires manual labor [15! It is necessary. Of course, the operation of inserting the conduit into the groove must also be performed from above the groove. Therefore, cable burying work requires a lot of materials and complicated labor.
In addition, there were problems such as low work efficiency.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention lowers sheet piles along both walls of an excavated trench and stands them on the bottom of the trench. Place the lining material in contact with the
The excavation is characterized in that, after interposing and fixing the spacing member through the raised material, the upper end of the sheet pile outside the groove is contracted at a certain interval to widen the lower end of the sheet pile in the direction of the soil wall. Ditch earth retaining method! This is what we provide.

According to the present invention, the sheet pile 'fs: is placed without being driven into the groove bottom, and the upper ends of the sheet piles are pulled together in the groove width direction using both ends of the spacing member as fulcrums. The lower ends of the piles at the groove bottom are pressed toward the soil wall and the mutual spacing increases, so there is no need to interpose and fix a spacing member near the lower ends of the sheet piles. Since the groove space near the groove bottom is increased compared to conventional construction methods, it has the effect of improving the workability of various operations.

EXAMPLES The present invention will be explained below based on the drawings. Figure 1 (8)~
(2) is an explanatory diagram of the process outline of the construction method of the present invention.

As shown in FIG. 1(8), a groove 2 previously opened in the ground 1 is excavated to a predetermined depth and width using an excavating device 3 such as a so-called back four. Then, as shown in FIG. 1), a sheet pile 4 is inserted into the groove 2 along both groove walls 2a, and lowered until the lower end of the sheet pile 4 reaches the groove bottom 2b+:,jl, and , the upper end of the top wall 4 is made to protrude from the ground 1 at a predetermined height. In this way, when the sheet piles 4 are inserted in the longitudinal direction of the groove 2 so as to be in contact with each other or within a certain range (for example, 3 to 4 m) at a predetermined interval, the sheet piles 4 are connected to each other as shown in FIG. The belly raising members 5 are abutted and fixed in the grooves 2 in the respective directions. The raising material 5 is made of square wood, hollow square metal material, etc., and is inserted horizontally from above the groove 2 into a hook-shaped receiving part 6 protruding from the side of the sheet pile 4, and is placed and fixed. It is. In this way, when the raising members 5 are fixed facing each other in the groove 2, as shown in FIG.
As shown in the figure, the spacing member 7 is interposed and fixed to the raised member 51- in the width direction of the groove 2. This spacing member 7 has two telescopically engaged tube bodies that can be fixed to a desired length through a bottle hole, and is a member that has been widely used in this type of construction. . When the spacing member 7 is interposed and fixed in the width direction of the groove 2, as shown in FIG. , 4 (A contraction nest 8 is mounted to reduce the gap between the rivers. This contraction nest 8 has two pipe bodies equipped with hydraulic or mechanical jacks 9, and by driving the jacks, the two The tubular body is designed to contract, and like the spacing member 7, a material that has been widely used as a construction material is used heretofore.

Note that the work of shrinking the gap between the upper ends of the sheet piles 4.4 in this way is contrary to the work described above, in which the outer sides of the sheet piles 4.4 are moved in the direction of approaching each other by pressing against each other. It may also be a thing. As above,
When the interval between the upper ends of the sheet piles 4.4 contracts, the interval retaining member 7 is attached to the sheet piles 4.4 as shown in Fig.
Since the upper end portions are close to each other as fulcrums, the lower end portions are separated from each other and are respectively suppressed toward the groove wall 2a. Therefore, the earth retaining action is produced without intervening and fixing the spacing member 7 to both the walls 2 & H and the sheet pile 4 in the vicinity of the groove bottom 2b. Moreover, since construction materials such as spacing members are not used in the vicinity of the groove bottom 2b, the space in the vicinity of the groove bottom 2b is formed thicker, making it easier to carry out various cable burying operations.

In addition, in the above process, if a device can be obtained that simultaneously brings the upper ends of the sheet piles 4 close to each other and holds the middle portions of the sheet piles 4 at a constant distance, the method of the present invention can be made even simpler, faster, and more efficient. It is possible to improve work efficiency. For example, it is conceivable to combine both ends of the shrinkage cavity 8 and the spacing member 7 integrally in the vertical direction via two side members to form a quadrilateral frame-like structure. Therefore,
A plurality of such frame-shaped groove bodies may be prepared and the above-mentioned method may be used during earth retaining construction.

Effects of the Invention According to the method of the present invention described above, the sheet pile is inserted into the groove, and the lower end thereof is placed on the groove bottom without being driven into the groove bottom to stand upright, and the sheet pile is erected in the groove width direction. At the same time, a spacing member is interposed between the sheet piles that are lowered relative to each other via a raising material, and a shrinkage nest is installed between the upper ends of the sheet piles, and then these spacer retaining members and shrinkage nest are operated from above the groove. As a result, it is possible to generate a force that can counteract the soil sills applied to the sheet piles, making it possible to easily create earth retaining structures even on soft ground. In addition, the sheet pile tilts using the spacing member as a fulcrum by contracting the contraction nest,
Since the lower end is pressed against the groove wall and the gap is widened, there is no need to use load-bearing materials such as spacing members between the sheet piles near the groove bottom, so the space near the groove bottom can be secured for a long time. It is possible to reduce the amount of load-bearing materials and improve work efficiency. Furthermore, since the spacing member and the shrinkage cavity are interposed near the upper end of the sheet pile and can be operated from above the groove, various operations can be performed outside the groove without the need for workers to enter the groove, making it safer. This has the advantage of being highly efficient and fully satisfying the construction owner's construction conditions.

[Brief explanation of the drawing]

FIG. 1 is a step-by-step explanatory diagram sequentially showing the construction method of the present invention from FIG. 1 to (G). 2... Excavation groove, 2a... Groove wall, 2b... Groove bottom, 4
...Sheet pile, 5... Raising material, 6... Receiving part, 7... Spacing member, 8... Shrinkage nest, 9...
Jyatsuki. Procedural amendment (voluntary) August 23, 1985 Patent No. 159797 of 1985 2 Title of invention Earth retaining method for excavated trenches 3 Relationship with the case of the person making the amendment Applicant's name Tsushin Kensetsu Co., Ltd. Otani Kogyo Co., Ltd. 4, Agent Address: 1-29 Akashi-cho, Chuo-ku, Tokyo, 104 Risekai Building Details of the amendment in column a of the detailed description of the invention in the specification

Claims (1)

[Claims] Sheet piles are lowered along both groove walls of the excavated trench and erected on the groove bottom, and the sheet piles are brought into contact with the raising material in the trench, and the spacing material is inserted through the raising material. An earth retaining method for an excavated trench, characterized in that after the sheet piles are interposed and fixed, the interval between the upper ends of the sheet piles outside the groove is contracted, and the lower ends of the sheet piles are widened in the direction of the earth wall.