JP2017155478A - Earth retaining preceding method of using adjustable wale - Google Patents

Abstract

PURPOSE: To provide an earth retaining preceding method of using an adjustable wale without using a permanent beam.CONSTITUTION: The present invention written in a Claim 1 is an earth retaining preceding method for supporting a sheet pile along an excavation groove by a timbering constituted of a pair of wales and a plurality of struts installed between both wales, and after installing the timbering, a lower beam material is installed in a lower end part of the sheet pile, and next, the strut of the upper timbering is removed, and after installing a pipe body in the excavation groove, the strut is installed again in the upper timbering, and next, the lower beam material is removed. The present invention written in a Claim 2 uses a freely expandable wale. In the present invention written in a Claim 3, the wale is constituted of an outer cylinder and an inner cylinder slidable in the outer cylinder.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an earth retaining prior construction method, and more particularly, to an earth retaining prior construction method that makes it possible to collect a discarded beam used when embedding a long pipe body such as a water pipe.

  For waterworks and sewerage work involving small-scale trench excavation work, in order to prevent occupational accidents associated with sediment collapse during trench excavation work and in-groove work, a soil retaining support will be installed prior to the work in the trench. It is normal.

  Specifically, it is excavated (raw digging) with a drag shovel, and then built with light steel sheet piles attached to the excavated surface, erected, and attached with beams to assemble a retaining support.

  In this way, the process of embedding long pipes such as water pipes after the installation of the support works in the pre-installation work method for installing the support works prior to the work in the groove, with reference to the drawings below. While outline.

  FIG. 11 shows a state where the support work 1 is installed in the excavation groove F. FIG. The sheet piles 2 are driven along the opposing wall surfaces of the excavation groove F, the square pipe-like ridges 3 are installed in contact with the sheet piles 2, and a plurality of jacks are used between the opposed ridges 3 and 3. A pair of supporting works 1 is formed by arranging the cut beams 4, and the supporting works 1 are arranged between a plurality of step sheet piles 2 and 2 for earth retaining. In addition, in FIG. 12, the support work 1 is arrange | positioned at two steps up and down.

  After the support 1 is installed as described above, the sling wire rope 6 is wound around a long pipe body 5 such as a water pipe, and is suspended in the excavation groove F with a drag shovel (not shown) using a hook corresponding to the load. Is. At this time, if the long tubular body 5 is to be suspended while being kept horizontal, the tubular body 5 comes into contact with the cut beam 4 constituting the support 1 and the tubular body 5 cannot be suspended. There is a case.

  In such a case, as shown in FIG. 12, a discarded beam 7 is first installed and reinforced near the lower end of the sheet pile 2, and then a cut beam 4 that hinders the suspension of the tubular body 5 as shown in FIG. That is, the two beams 4 existing in the center are removed from the beams 4 constituting the upper support 1a.

  Next, as shown in FIG. 14, after the pipe body 5 is hung down to the upper part of the lower support 1b, the cut beam 4 of the removed upper support 1a is installed again and reinforced.

  Next, as shown in FIG. 15, among the beams 4 constituting the lower support 1 b, the beams 4 that are hindered from being suspended are removed by coming into contact with the pipe body 5, and in this state, The pipe body 5 is suspended to the lower end.

  In such a construction method, the discarded beam 7 is usually left in the soil as it is without being collected even after the pipe burying work is completed.

  Patent Document 1 discloses a construction method in which an upper beam is installed on an upper portion of a sheet pile in order to eliminate a cutting beam that hinders the work in the excavation groove.

JP-A-9-291562

  In the conventional earth retaining prior construction method, abandoned beams may be used as described above, resulting in a significant increase in work costs. There are also many problems from the viewpoint of resource saving. Therefore, the present invention provides a soil retaining preceding construction method that does not require the use of a discarded beam even when a long pipe body that obscures a cut beam during suspension is used, and therefore does not require the abandoned abandoned buried beam. The purpose is to do.

  Also, in the conventional construction method, wood is often used as a discarded beam, but if wood is used, it may rot after being buried and leave a gap under the tube. Such a situation can cause depression.

  In addition, if the pipe line is long, a lot of discarded beams are required, so that the material cost increases, and a large amount of wood may adversely affect the environment.

  Moreover, when embedding a long tubular body, it is preferable to use an erection of a length corresponding to the length of the tubular body. Then, it is necessary to carry various lengths of erections to the laying place. If this is the case, there will be a large number of erections to be carried in, and there will be a problem that the carrying amount will increase. An object of the present invention is to provide an earth retaining prior construction method that can solve such problems.

  The configuration of the present invention that achieves the above object is as follows.

  (1) The invention according to claim 1 supports the sheet pile along the excavation groove by a support construction composed of a pair of erections and a plurality of beams installed between the erections. In the earth retaining prior construction method, after the support work is installed, the lower beam material is installed at the lower end of the sheet pile, then the upper support work beam is removed, the pipe is installed in the excavation groove, and then the upper support work is re-established. Cut the beam and then remove the lower beam.

  (2) The invention described in claim 2 uses a stretchable erection in the earth retaining preceding construction method described in claim 1.

  (3) The invention described in claim 3 is the earth retaining prior construction method described in claim 2, wherein the upset is configured by an outer cylinder and an inner cylinder that can slide in the outer cylinder.

  It will be outlined with reference to the drawings how the present invention configured as described above works to solve the problems.

  FIG. 4 shows a state where the supporting works 10a and 10b are installed in the excavation groove F excavated by a drag shovel or the like. The sheet piles 2 are driven along the opposing wall surfaces of the excavation groove F, the flank 20 is installed in contact with the sheet pile 2, and a plurality of beams 4 using a jack between the opposed flank 20, 20. The supporting works 10a and 10b are formed by disposing the structure, and earthing is performed.

  At this time, if the erection 20 is telescopic, an adjustable erection having an appropriate length can be installed according to the length of the excavation groove. In addition, since the length can be adjusted, it is not necessary to carry various erections of various lengths to the laying place as in the conventional construction method. Furthermore, it can be carried into the excavation groove with a short erection, and it is possible to install a retaining wall and a retaining wall even in a narrow site where a crane cannot enter.

  Moreover, in the invention concerning Claim 3, it also has the effect that the manufacturing cost of an angry rise can be suppressed. That is, a greater earth pressure is applied to the central part of the erection that constitutes the support structure than to both ends. On the other hand, as shown in FIG. 8, the erection 20 according to the third aspect includes a thick outer cylinder 21 and an inner cylinder 22 slidable in the outer cylinder 21. That is, since the thick outer cylinder 21 having durability against a large earth pressure exists in the central portion, the inner cylinder 22 that exists at both ends and has a small load can be formed of a material having a lower strength than the outer cylinder 21. . That is, the manufacturing cost can be suppressed.

  FIG. 5 shows that the lower beam material 30 is installed in the excavation groove F in which the support work 10 is installed as described above and the earth retaining is reinforced, and then the cut beams of the support works 10a and 10b installed on the upper and middle portions of the sheet pile. 4 shows a state in which the cut beam 4 that hinders the suspension of the pipe body 5 is removed. Since the earth retaining material is reinforced by the lower beam material 30, there is no fear of landslide even if the cut beam 4 is removed, and the work can be performed safely. Further, as shown in the drawing, since the cut beam 4 that may come into contact with the tube body 5 has been removed, even a long tube body 5 can be suspended while being kept horizontal. It becomes.

  As shown in FIG. 6, after suspending the pipe body 5 in the excavation groove F while keeping the horizontal, the cut beam 4 is installed again in the support works 10a and 10b, and after the earth retaining is reinforced, finally As shown in FIG. 7, the lower beam member 30 is removed, and the tubular body 5 is installed on the ground surface. As described above, according to the present invention, the lower beam material 30 can be collected, and it is not necessary to use a so-called abandoned beam that is left as it is as in the conventional example. In other words, there is no increase in material costs, there is no fear of sinking when wood is used as a discarded beam, and adverse effects on the environment can be suppressed as much as possible.

  As described above, the present invention is a construction method for temporarily reducing the earth pressure burden of the upper support by installing the lower beam material, and securing the opening dimension for hanging the pipe horizontally. In this construction method, the lower beam material can be removed during the pipe laying process. By using a stretchable erection in this construction method, it is possible to efficiently provide a support having an appropriate size according to the tubular body.

Explanatory drawing showing the installation process of support construction Explanatory drawing showing the installation process of support construction Explanatory drawing showing the installation process of support construction Explanatory drawing showing completed support work Explanatory drawing showing the process of hanging the pipe Explanatory drawing showing the process of hanging the pipe Explanatory drawing showing the process of hanging the pipe Explanatory diagram of upset Explanatory diagram of upset Explanatory diagram of upset Explanatory drawing showing the conventional method Explanatory drawing showing the conventional method Explanatory drawing showing the conventional method Explanatory drawing showing the conventional method Explanatory drawing showing the conventional method

  Hereinafter, an example of an embodiment of the earth retaining prior method of the present invention will be outlined with reference to the drawings. The embodiment of the present invention is not limited to the following embodiment, and can take various forms as long as they belong to the technical scope of the present invention.

  First, as shown in FIG. 1, the ground is excavated to a predetermined depth with a drag shovel or the like (not shown) to form an excavation groove F. The sheet piles 2 and 2 are driven along the opposite side surfaces of the excavation groove F at a set interval. Next, after the rectangular pipe-like erection 20 is suspended in the excavation groove F by a chain or the like, a plurality of slabs are used in the excavation groove F using a jack between the opposing erections 20 and 20. 4 is disposed (see FIG. 2).

  After that, outside of the erection 20, the sheet pile 2 is sequentially inserted from the upper side so as to partially overlap from one sheet pile 2 driven at a set interval to the other sheet pile 2, thereby driving the soil of the excavation groove F. The fastening is performed (see FIG. 3).

  The earth retaining work is completed by the above steps as shown in FIG. In addition, although the support work is provided in the upper and lower two stages of 10a and 10b in the figure, it may be provided in one or more stages depending on earth pressure.

Next, as shown in FIG. 5, the lower beam member 30 is installed, and among the cut beams 4 of the support works 10 a and 10 b existing at the upper part, those that obstruct the suspension of the pipe body 5 are removed. The lower beam member 30 is disposed between jacks 20 and 20 facing each other using a jack.
Next, as shown in FIG. 6, a slinging wire rope 6 is wound around the pipe body 5 and is suspended in the excavation groove F by a drag shovel (not shown) using a hook corresponding to the load, and is again attached to the upper support works 10a and 10b. A cutting beam 4 is disposed. At this stage, the tube 5 is not lowered to the ground. This is because it is difficult to remove the lower beam member 30 when it is lowered to the ground.

  FIG. 7 shows a state in which the lower beam member 30 is removed from this state and the tubular body 5 is lowered to the ground.

  The belly ridge 20 used in the present invention may be a rectangular pipe that does not expand or contract. However, in the inventions according to claims 2 and 3, the one that can expand and contract as shown in FIGS. Is adopted. That is, the erection 20 includes a square pipe-shaped outer cylinder 21 and an inner cylinder 22 as shown in FIG. A plurality of pin holes 21a and 22a are provided on the upper surfaces of the outer cylinder 21 and the inner cylinder 22, respectively, and after the positions of the pin holes 21a and 22a are aligned as shown in FIGS. The outer cylinder 21 and the inner cylinder 22 are fixed by inserting the connecting pin 40 in such a form. Of course, this is only an example. For example, the outer cylinder and the inner cylinder may be fixed with a fastening metal fitting such as a bolt or nut.

 The abdominal ridge 20 configured as described above can be expanded and contracted by taking in and out the inner cylinder 22, and the adaptability to the cut dimensions is improved. Note that the size and material of the erection 20 may be determined in consideration of the area of the retaining wall to be received and the earth pressure received by the wall.

10. · Supporting work 20 · · Raising 21 · · Outer tube 22 · · · Inner tube 30 · · Lower beam material

Claims (3)

It is a soil retaining precedent construction method that supports a sheet pile along a digging groove with a support structure composed of a pair of erections and a plurality of beams installed between both erections,
After installing the support work, install the lower beam material at the lower end of the sheet pile, then remove the upper support work cut beam, install the pipe in the excavation groove, then install the cut beam again in the upper support work, Next, the earth retaining prior construction method characterized by removing the lower beam material.   2. The earth retaining prior construction method according to claim 1, wherein a stretchable uplift is used.   The earth retaining prior construction method according to claim 2, wherein the erection is constituted by an outer cylinder and an inner cylinder slidable in the outer cylinder.

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