JP2005351041A - Existing pipe removing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an existing pipe removing method for removing an existing pipe at a low cost. <P>SOLUTION: The existing pipe removing method comprises a shaft construction process of constructing a departing shaft 10a on one end of the existing pipe 11 buried underground and constructing a departing shaft 10b on the other end of the existing pipe 11, a jacking process of jacking a steel pipe 20 from the departing shaft 10a toward the departure shaft 10b to cover the existing pipe 11, a covering process of installing a cover on an arrival shaft opening 17 in the leading end of the steel pipe 20 when the leading end arrives at the departure shaft 10b and a drawing process of drawing the steel pipe 20 including the existing pipe inside from the departure shaft 10b toward the departure shaft 10a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an existing pipe removing method, and more particularly to an existing pipe removing method capable of removing an existing pipe at a low cost.

  Conventionally, an existing pipe removal method has been proposed in which unnecessary buried pipes are removed without excavating the ground surface, and at the same time, the space is filled with appropriate soil and returned to the original ground that can be re-excavated (Patent Document). 1).

  FIG. 7 is a cross-sectional view for explaining a conventional existing pipe removing method. In the figure, when removing the existing pipe 3 buried in the ground, first, the crushing cutter type machine 4 is inserted into the ground from the shaft 1 to one end side of the existing pipe 3. Next, the crushing cutter type machine 4 is propelled along the existing pipe 3 while crushing the existing pipe 3 by the main pushing jack 5.

  Here, a plurality of temporary pipes 8 are sequentially connected to the rear end of the crushing cutter type machine 4, and these temporary pipes 8 are promoted, and at the same time, the crushed existing pipe 3 and the sand and sand are passed through the temporary pipe 8. It is discharged to the shaft 1.

  When the temporary pipe 8 reaches the vertical shaft 2 located at the other end of the existing pipe 3, the temporary pipe 8 is sequentially pulled out by the vertical shaft 2, and appropriate soil is placed in the space where the temporary pipe 8 is removed from the vertical shaft 1 side. Filled.

JP 7-317958 A

  By the way, in the conventional existing pipe removal method, the crushing cutter machine 4 is driven while crushing the existing pipe 3 with the crushing cutter machine 4, so that a considerable crushing force is required for the crushing cutter machine 4. Is done. Therefore, in the existing pipe removing method, the crushing cutter type machine 4 having a considerable crushing force must be used in order to cope with existing pipes having various strengths, and the cost of the crushing cutter type machine 4 is high. There was a problem.

  Moreover, in the existing pipe removal method, since the existing cutter 3 is crushed, a considerable impact is applied to the crushing cutter type machine 4, so that the crushing cutter type machine 4 is consumed heavily, replacement is increased, and maintenance costs are also increased. There was also the problem of being expensive.

  This invention is made | formed in view of the above, Comprising: It aims at providing the existing pipe removal method which can remove an existing pipe at low cost.

  In order to solve the above-described problems and achieve the object, the present invention constructs a first shaft on one end side of an existing pipe buried in the ground, and a second shaft on the other end side of the existing pipe. A shaft construction process for constructing a shaft, an excavation step for excavating a drawing pipe so as to cover the existing pipe in a direction from the first shaft to the second shaft, and a distal end portion of the drawing pipe is the second portion When reaching the vertical shaft, a cover step of covering the tip portion and a pulling step of pulling out the extraction tube containing the existing pipe from the second vertical shaft toward the first vertical shaft are included. It is characterized by that.

  According to the present invention, when the extraction pipe is dug so as to cover the existing pipe in the direction from the first vertical shaft to the second vertical shaft, the leading end of the extraction pipe reaches the second vertical shaft. Since the cover is covered and the extraction pipe containing the existing pipe is pulled out from the second vertical shaft to the first vertical shaft, the cost associated with the crushing of the existing pipe is not incurred as in the conventional case. The existing pipe can be removed at low cost.

  Below, the Example of the existing pipe removal method concerning this invention is described in detail based on drawing. Note that the present invention is not limited to the embodiments.

  FIGS. 1-6 is sectional drawing explaining the 1st process-6th process of the existing pipe removal method by one Example concerning this invention. Below, the method of removing the existing pipe buried in the ground is explained.

  In the first step shown in FIG. 1, the start shaft 10 a and the reaching shaft 10 b are built on the ground 10. As a result, the existing pipe is divided into the existing pipe 11, the existing pipe 12 and the existing pipe 13. The existing pipe 11 is a removal target. The start shaft 10a is located on one end side of the existing pipe 11, and is a shaft for starting a steel pipe 20 (see FIG. 2) described later. On the other hand, the reaching shaft 10b is located on the other end side of the existing pipe 11, and is a shaft to which the steel pipe 20 (see FIG. 2) reaches.

  Further, a cutting tube 14 for cutting is connected to the end of the existing tube 12. Similarly, a cutting tube 15 for cutting is connected to the existing tube 13.

  Next, in the 2nd process shown in FIG. 2, while the start well 16 is installed in the start shaft 10a, the arrival well 17 is installed in the reach shaft 10b. Next, a steel pipe propulsion machine 19 for propelling the steel pipe 20 from the start pit 16 to the arrival pit 17 is installed in the start shaft 10a. Here, the steel pipe 20 is configured by adding a plurality of partial steel pipes 21 and has a diameter slightly larger than that of the existing pipe 11. This steel pipe 20 is a drawing pipe used when the existing pipe 11 is drawn.

  Next, after the steel pipe 20 is provided so as to cover the existing pipe 11 from the starting pit 16, the steel pipe 20 is pushed toward the reaching pit 17 by the propulsion method by the steel pipe propulsion device 19, and as the cutting progresses, The partial steel pipe 21 is added.

  And when the steel pipe 20 reaches | attains the arrival wellhead 17, the steel pipe obstruction | occlusion lid | cover 22 for obstruction | occlusion is attached to the front-end | tip part of the steel pipe 20 at the 3rd process shown in FIG. In this state, the existing pipe 11 is present inside the steel pipe 20. The steel pipe closing lid 22 serves to hold the existing pipe 11 in the steel pipe 20 when the steel pipe 20 (existing pipe 11) is pulled out.

  Next, the steel pipe 20 is pulled out from the arrival well 17 to the start well 16 by the reverse rotation of the steel pipe propulsion device 19. Then, at the time when the steel pipe 20 is slightly pulled out, the arrival well closing cover 26 is attached to the arrival well 17 in the fourth step shown in FIG. This reaching well opening cover 26 is a cover for closing the reaching well opening 17. Next, a filler injection plant 23 is installed on the ground, and a pipe 24 that connects the filler injection plant 23 and the arrival well closing cover 26 is installed. The filler injection plant 23 is a plant for injecting a filler 25 for filling a cavity after the steel pipe 20 is pulled out. As the filler 25, for example, a slow-hardening lubricant often used as a back-filling material in propulsion work is used.

  Next, in the fifth step shown in FIG. 5, when the steel pipe propulsion device 19 is reversely rotated and the steel pipe 20 containing the existing pipe 11 is pulled out by a predetermined length, it corresponds to the predetermined length on the start shaft 10a side. The partial steel pipe 21 to be cut is cut from the steel pipe 20, and the partial existing pipe 11a corresponding to a predetermined length is also cut from the existing pipe 11. Further, when the steel pipe 20 is pulled out, the filler 25 is filled into the cavity after being pulled out from the filler injection plant 23 via the pipe 24 and the arrival well closing cover 26. Thereafter, a series of operations of drawing a predetermined length, removing the partial steel pipe 21, cutting the partial existing pipe 11 a and filling the filler 25 is repeatedly performed.

  Then, when the steel pipe 20 and the existing pipe 11 are completely pulled out and removed, in the sixth step shown in FIG. 6, the steel pipe closing lid 22 is left at the start pit 16, and the steel pipe propulsion machine 19, the filler injection plant 23 and the piping 24 are removed. Then, when the filler 25 filled in the cavity corresponding to the existing pipe 11 is cured, the start shaft 10a and the reaching shaft 10b are backfilled.

  In addition, in one Example, although the structural example filled with the filler 25 from the reaching shaft 10b side was demonstrated, it is good also as a structural example filled with the filler 25 from the starting shaft 10a side instead of the reaching shaft 10b side. In this case, when the steel pipe 20 reaches the reaching shaft 10b, an injection pipe (not shown) is provided in the existing tube 11 from the starting shaft 16 of the starting shaft 10a. Next, one end opening of the injection pipe is made to coincide with an opening provided in advance in the steel pipe closing lid 22, and the steel pipe closing lid 22 and the injection pipe are fixed.

  Next, at the start pit 16, the other end opening (starting pit 10 a side) of the injection pipe in the existing pipe 11 is connected to the filler injection plant 23 via the pipe 24. Thereafter, the arrival well closing cover 26 is attached to the arrival well 17 in the same manner as described above. Then, in the same manner as described above, the steel pipe 20 is removed and the existing pipe is cut by the steel pipe propulsion device 19, and the steel pipe 20 is pulled out together with the existing pipe 11. At this time, the filling pipe 23 is filled with the injection pipe. The filler 25 similar to the above is fed, the filler 25 is discharged from the opening of the steel pipe closing lid 22, and the cavity formed after the steel pipe 20 is pulled out is filled.

  It should be noted that the injection pipe in the existing pipe 11 requires a switching operation to be shortened as the existing pipe 11 is pulled, but if a joint is previously provided in the pipe according to the cutting pitch of the existing pipe 11 Pipe switching works smoothly.

  As described above, according to one embodiment, the steel pipe 20 is dug so as to cover the existing pipe 11 in the direction from the start vertical shaft 10a to the start vertical shaft 10b, and the tip of the steel pipe 20 reaches the start vertical shaft 10b. In this case, the tip is covered and the steel pipe 20 containing the existing pipe 11 is pulled out from the starting shaft 10b in the direction of the starting shaft 10a. Therefore, the existing pipe 11 can be removed at a low cost.

  As described above, the existing pipe removing method according to the present invention is useful for reducing the cost for removing the existing pipe.

It is sectional drawing explaining the 1st process of the existing pipe removal method by one Example concerning this invention. It is sectional drawing explaining the 2nd process of the existing pipe removal method by the same Example. It is sectional drawing explaining the 3rd process of the existing pipe removal method by the same Example. It is sectional drawing explaining the 4th process of the existing pipe removal method by the same Example. It is sectional drawing explaining the 5th process of the existing pipe removal method by the same Example. It is sectional drawing explaining the 6th process of the existing pipe removal method by the same Example. It is sectional drawing explaining the conventional existing pipe removal method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground 10a Starting shaft 10b Reaching shaft 11 Existing pipe 11
19 Steel pipe propulsion machine 20 Steel pipe (drawing pipe)
21 Partial steel pipe 23 Filling material injection plant 24 Piping 25 Filling material

Claims (3)

A shaft construction step of constructing a first shaft on one end side of an existing pipe buried in the ground, and constructing a second shaft on the other end side of the existing pipe;
An excavation step of excavating the extraction pipe so as to cover the existing pipe from the first vertical shaft toward the second vertical shaft,
When the leading end of the extraction pipe reaches the second shaft, a lid step for covering the leading end;
A drawing step of pulling out the drawing pipe containing the existing pipe from the second vertical shaft toward the first vertical shaft;
An existing pipe removing method characterized by including:   2. The existing pipe removing method according to claim 1, wherein in the drawing step, the drawing pipe and the existing pipe are sequentially cut while being pulled out by a predetermined length.   The existing pipe removing method according to claim 1, further comprising a filling step of filling the cavity after the drawing pipe is drawn with a filler.

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