JP5324413B2 - Temporary piping installation method - Google Patents

Description

  The present invention relates to an installation method of a temporary pipe that becomes a bypass pipe of a main pipe before repair or replacement work of the main pipe.

  In the construction of gas pipes and water pipes, it is necessary to install detour pipes (temporary pipes) for the main pipes so that the supply of gas and water is not interrupted. Therefore, temporary piping installation work is performed in which temporary piping is buried and the temporary piping buried after the main construction is dug.

  The digging of the temporary pipe is performed by mechanical excavation (yumbo power shovel) up to the vicinity of the temporary pipe burying depth, and thereafter, the peripheral portion of the temporary pipe is manually dug.

  In addition, in the case of main construction, if the construction takes several days, temporary filling is performed after the completion of the day's construction, and the temporary backfilling site is dug up again when the construction is resumed. In order to simplify the work, instead of heavy earth and sand, a large number of synthetic resin hollow spheres are put into a net, the net body is filled at the bottom of the excavation groove, and the upper part of the excavation groove is a fixed partition material ( Means for filling a roadbed material via a water-permeable sheet and temporarily burying it is known (Patent Document 1: JP-A-7-317008).

  Patent Document 2 (Japanese Patent Laid-Open No. 8-193304) In place of the hollow body-filled net body, a 5 to 20 kg closed foam resin block body is adopted, and a sand bag is temporarily buried above the block body. The construction method which employ | adopts as a body and also employs earth and sand as an upper layer temporary embedding body is disclosed.

JP-A-7-317008. JP-A-8-193304.

  As described above, the temporary piping is dug up by a combination of machine digging and manual digging, and the manual digging work is a cumbersome work, similar to the main pipe construction. However, it is not recognized that the use of the temporary buried body disclosed in Patent Documents 1 and 2 is suitable for the construction of temporary piping.

  Main pipe construction requires daily digging, and the deformation of the resin temporary embedding can be confirmed at the time of daily digging, and it can be replaced as soon as damage deformation is confirmed. Rather than digging up immediately like temporary backfilling in main construction, the state of burial for a long period (several months) is maintained, so that loads such as vehicle travel on the burial site are constantly added during that period. Thus, when the resin-made temporary embedded body is deformed, the portion is depressed, and there is a danger in vehicle travel.

  In addition, the main pipe must be buried at a suitable depth to ensure long-term safety, and backfilling and re-digging requires a certain depth. Although it can be said that the use of various temporary buried bodies is effective when viewed comprehensively, in the construction work of temporary piping that can be buried shallower than the main pipe, Adoption of a temporary manufacturing body is an excessive quality, which is a problem in terms of cost.

  Therefore, the present invention proposes a novel temporary piping installation method that facilitates excavation of temporary piping without using a temporary buried body.

  In the first temporary pipe installation method according to the present invention (Claim 1), after excavating the excavation groove for installing the temporary pipe, the temporary pipe is placed on the bottom surface of the excavation groove, and is appropriately sized and Cover the temporary piping with a sheet body with lifting connection parts at least at the four corner side edges, and lay it in the groove so as to cover the lower part of the groove side surface of the excavation groove, and fill the excavation groove with earth and sand It is characterized by being returned.

  Thus, in the above-described temporary pipe installation method, the excavation when removing the temporary pipe is performed by the same mechanical digging up to the vicinity of the buried depth of the temporary pipe, and after the mechanical digging, the lifting connection portion of the sheet body Digging the remaining backfill soil at once by lifting the chain with a working part (arm tip) of a drilling machine such as a yumbo or a hydraulic excavator with a crane or a crane, etc. It becomes the lifting excavation taken out from the groove, and the temporary piping can be removed without digging by hand.

  The temporary piping installation method according to the present invention (Claim 2) is the above-described installation method, in which the sheet body has a size that reaches a position higher than the upper edge of the temporary piping on the groove side surface. Since the lifting connection portion of the sheet body is reliably exposed by machine digging to a depth near the embedding depth, lifting excavation can be easily performed.

  The temporary piping installation method according to the present invention (Claim 3) is a structure in which the lifting connection portion in the sheet body corresponds to a lifting device having a casing arranged in parallel corresponding to the seat length. When excavating, the bending between the front and rear lifting connection portions can be reduced, and lifting excavation can be performed efficiently.

  In the second temporary pipe installation method according to the present invention (Claim 4), after excavating the excavation groove for installing the temporary pipe, the temporary pipe is placed on the bottom surface of the excavation groove to obtain the width of the excavation groove. A sheet body of an appropriate length with a corresponding predetermined width, with only a front end portion or a front end portion and an appropriate distance provided on a side edge at a side edge, and a back end capable of at least mechanical excavation at the front end of the sheet body. It is characterized in that it is placed in close contact with the temporary piping so as to be located above the height of the earth and sand, and is laid in the groove so as to cover the entire bottom surface of the excavation groove, and the earth and sand are backfilled in the excavation groove. To do.

  Thus, the temporary pipe installation method is the same as the conventional machine until the burial depth of the temporary pipe is removed, as in the case of the above-described installation method (the invention of claim 1). After digging, after the machine digging, if the tensile connection part at the tip of the sheet body is connected to an appropriate part of a traveling machine or a lifting machine such as a yumbo or a dumping machine and pulled or lifted, the remaining backfilling soil will be It will be lifted together with the uplifting and will spill out to the side of the excavation groove, and the temporary piping can be removed without digging by hand. Further, if the sheet body is raised, the remaining backfill soil can be discharged continuously by using a tensile connecting portion provided in the middle of the sheet body.

  Moreover, the temporary pipe installation method according to the present invention (Claim 5) has a structure in which the tensile connecting portion in the sheet body corresponds to a lifting instrument or a tension instrument provided with a casing corresponding to the sheet width. For example, a sheet is formed by forming a through ring or the like on a side edge, inserting a housing into the through ring (tensile connection portion), and pulling or lifting the housing with an appropriate device (running machine body or lifting machine such as a yumbo). It is possible to carry out effectively without the body rising and the sheet body being biased left and right.

  Furthermore, in the temporary pipe installation method according to the present invention, part or all of the sheet body has a net or other water-permeable structure, and even if the rain penetrates into the excavated groove, it can remain in the sheet body. Absent.

  The configuration of the present invention is as described above, and without using a special resin temporary embedding body, the excavation soil of the excavation groove and the backfilling sand are used in the same manner as before. However, when the temporary pipe is dug up when the temporary pipe is removed, it is only necessary to excavate by mechanical force, and the work efficiency is remarkably improved.

Explanatory drawing of the sheet | seat body used for 1st embodiment construction method of this invention. Explanatory drawing of the temporary piping installation process of the construction method. Explanatory drawing of the digging (machine digging). Explanatory drawing of the digging (sheet body lifting). Explanatory drawing of the sheet | seat body used for 2nd embodiment construction method of this invention. Explanatory drawing of the temporary piping installation process of the construction method. In the explanatory drawing of the use state of the sheet body of the construction method, (a) shows the state before the backfilling, and (b) shows the sheet body raised state. In the explanatory drawing of the digging, (a) shows machine excavation, and (b) shows the state of raising the sheet body.

  Next, a first embodiment (first construction method) of the present invention will be described. In the temporary piping installation method, which is the first method shown in FIGS. 1 to 4, the sheet body 1 and the lifting tool 2 are used.

  The sheet body 1 is formed of a material and size (having a width to be described later) that is sufficiently durable for the sheet body 11 to lift up the earth and sand. Not as fine as possible), or part of it is net-like, or part of or all of it is made to have water permeability by making fine holes, and the four corners (the sheet body is rectangular) At the edge, the ring-shaped ear portion is stitched with the same material as that of the seat body 11 to form the lifting connection portion 12.

  Of course, the lifting connecting portion 12 may be formed as a separate ring-shaped ear portion and attached to the seat body 11, or may be one corresponding to the structure of the connecting portion of the lifting tool 2 described later. . Further, in addition to the four corner portions, they may be provided in the middle.

  The lifting tool 2 has two lengths 21 arranged in parallel with a length corresponding to the length of the seat body 11, and the lifting connection portion 12 such as a hook shape formed on the front and rear ends of the height body 21. And a lifting portion 23 formed of a chain or the like that enables the housing 21 to be lifted up by an excavating machine E such as a yumbo.

  In the construction method of the present invention using the above-described instrument, the excavation groove B for temporary pipe installation is excavated by a predetermined excavation machine E equipped with a hydraulic excavator such as a jumbo in order to embed the temporary pipe A. The excavation groove B has a depth that matches the depth at which the temporary piping A should be installed, except for the portions necessary for the connection between the temporary piping A.

  The temporary piping A is placed directly on the bottom surface b1 of the excavation groove B, and then the sheet main body 11 is put on the temporary piping A in close contact with the temporary piping A, and the bottom surface b1 and the side surface b2 of the excavation groove B are covered. Lay down to cover the lower part. In this case, the seat body 11 is made to reach a position higher than the upper edge of the temporary pipe A on the side surface b2 of the excavation groove B. Thereafter, the earth and sand C are backfilled in the excavation groove B and the surface is paved by appropriately filling, or the covering mat D is laid and the installation work of the temporary piping A is completed (FIG. 2).

  The temporary pipe A needs to be dug up and removed after the main pipe work is completed. In this removal operation, the excavating machine E performs machine excavation to a depth near the burial depth of the temporary piping A (FIG. 3).

  Next, the lifting connection part 12 of the sheet body 1 is exposed, the lifting connection part 12 is connected to the connection part 22 of the lifting tool 2 by means such as hooking, and the lifting part 23 of the lifting tool 2 is connected to the working part of the excavating machine E. When the sheet body 1 is lifted by the excavating machine E by being connected to the excavator portion at the tip of the arm, the remaining backfilling soil C is taken out from the excavation groove B all at once, and the temporary piping A is exposed (FIG. 4). .

  Therefore, the temporary piping A is removed, the excavation groove B is refilled, the road surface is paved, and the temporary piping A is removed. The temporary piping A can be efficiently removed without any manual digging work. It is possible.

  Next, a second embodiment (second method) of the method according to the present invention will be described. The second construction method is as shown in FIGS. 5 to 8 and uses the sheet body 3 and the casing 4.

  Similar to the sheet body 1, the sheet body 3 has sufficient strength and durability, and if necessary, the entire net body is a fine net shape, or a part of the net shape is formed, or fine through holes are drilled. The seat main body 31 is a long band having the same width as or slightly wider than the bottom surface b1 of the excavation groove B in which the temporary piping A is embedded. Specifically, when the temporary piping A is installed in the excavation groove B, the width of the both ends coincides with the side surface of the excavation groove B or is located slightly inside the side surface. The tensile connection parts 32 and 32a are provided.

  The tensile connecting portion 32 is provided at the left and right ends of the front end portion of the sheet main body 31, and the tensile connecting portion (intermediate connecting portion) 32a is provided along the side edge of the sheet main body 31 at an appropriate interval. The casing 4 having an appropriate strength is formed in a through-ring shape that penetrates and is mounted in the width direction.

  The second construction method of the present invention using the above-mentioned tool digs the excavation groove B for embedding the temporary piping A, similarly to the first construction method. The excavation groove B has a depth that matches the depth at which the temporary piping A should be installed, except for the portions necessary for the connection between the temporary piping A. Then, the temporary piping A is directly placed on the bottom surface b1 of the excavation groove B, and then the temporary piping A is covered with the sheet body 31 in close contact with the temporary piping A, and the bottom surface b1 of the excavation groove B is covered. (Fig. 7a).

  In this case, the tensile coupling portion 32 at the tip portion of the seat body 31 is laid so as to protrude beyond a machine excavable line (line a in FIG. 6) described later, and then the earth and sand C are backfilled in the excavation groove B. Then, the surface is paved by appropriately filling, or the covering mat D is laid and the installation work of the temporary piping A is completed (FIG. 6).

  The temporary pipe A needs to be dug up and removed after the main pipe work is completed. In this removal operation, the excavating machine E performs the machine excavation up to the burial depth of the temporary pipe A (machine excavation line a) (FIG. 8A).

  Next, when the housing 4 is passed through the left and right tensile connecting portions 32 at the front end portion of the seat body 31, and the housing 4 is pulled up rearward of the seat body along the excavating groove B by the excavating machine E or other traveling machines. The remaining backfilling soil C is lifted together with the lifting of the sheet body 3 and spills out to the side of the excavation groove B. Further, the lifting operation of the sheet body 3 proceeds and the intermediate connecting portion 32a is moved. When exposed, when the casing 4 is inserted through the intermediate connecting portion 32a and pulled further rearward, the backfill soil C will gradually flow out to the side of the excavation groove B, and the temporary piping A is sequentially exposed.

  Therefore, the temporary piping A is removed, the excavation groove B is refilled, the road surface is paved, and the temporary piping A is removed. The temporary piping A can be efficiently removed without any manual digging work. It is possible.

DESCRIPTION OF SYMBOLS 1 Sheet body 11 Sheet body 12 Lifting connection part 2 Lifting tool 21 Housing 22 Connection part 23 Lifting part 3 Sheet body 31 Sheet body 32 Tensile connection part 32a Tensile connection part
4 Housing A Temporary piping B Excavation groove b1 Bottom b2 Side C Earth and sand D Cover mat E Excavation machine

Claims (6)

  After excavating the excavation groove for installing the temporary pipe, the temporary pipe is placed on the bottom surface of the excavation groove, and a sheet body that is appropriately sized and has lifting connection portions at least at the four corner side edges is attached to the temporary pipe. A temporary piping installation method characterized in that it is covered in close contact and is laid in the groove so as to cover the lower part of the groove side surface of the excavation groove, and earth and sand are backfilled in the excavation groove.   The temporary pipe installation method according to claim 1, wherein the sheet body has a size that reaches a position higher than the upper edge of the temporary pipe on the groove side surface.   The installation method of the temporary piping according to claim 1 or 2, wherein the lifting connection portion in the sheet body has a structure corresponding to a lifting device including a casing disposed in parallel corresponding to the seat length.   After excavating the excavation groove for installing the temporary piping, the temporary piping is placed on the bottom surface of the excavation groove, and at the predetermined width corresponding to the width of the excavation groove, only the tip portion or the tip portion and the side edge at an appropriate interval A sheet body of an appropriate length provided with a tension connecting portion is closely attached to the temporary pipe so that the tensile connecting portion at the tip of the sheet body is positioned at least higher than the height of backfill earth and sand that can be machine excavated. A temporary piping installation method characterized by covering the bottom surface of the excavation groove and covering the entire bottom surface of the excavation groove, and filling the excavation groove with earth and sand.   The temporary piping installation method according to claim 4, wherein the tensile connecting portion in the sheet body has a structure corresponding to a lifting device or a tensioning device provided with a casing corresponding to the sheet width.   The temporary pipe installation method according to any one of claims 1 to 5, wherein a part or all of the sheet body has a net or other water-permeable structure.

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