JP5301316B2 - Water pipe pipe disposal method - Google Patents

Description

  The present invention relates to a method for disposing of an existing buried channel pipe that is not currently used.

In urban areas where the land has been sorted out, water pipes that are no longer used remain buried underground and remain as unnecessary water pipes.
In such a case, if the channel pipe is left as it is without being removed without being removed, the channel pipe will corrode or be damaged over time, creating a cavity in the ground, which causes the ground to collapse. And may cause deformation.
Therefore, a filler is filled in an existing buried water channel pipe that is no longer used, and even if the water channel pipe is corroded or broken, a cavity is prevented from being formed in the ground by the filler (see Patent Document 1).

Hereinafter, an example of a conventional water pipe pipe disposal method will be described with reference to FIGS.
FIG. 1 is a partial plan view of an urban area where a water pipe to be disposed of is buried, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
1 and FIG. 2, 2 is a road constructed on the ground part, 4 is a private house constructed on the residential land part of the ground part, 6 is a square constructed on the ground part, and 8 is a road 2 on the side of the road 2. The reference numeral 10 denotes an existing unused waterway pipe buried in the ground at a depth of 2 to 3 m from the ground surface. The canal pipe 10 has a diameter of 1 to 2 m, and earth and sand containing aggregates are deposited as accumulated sand 12 on the bottom portion in the canal pipe 10.

Next, a conventional disposal method for the water pipe 10 will be described.
First, as shown in FIG. 2, at the disposal start position P1 and the disposal end position P2 with respect to the water pipe 10, boring for chemical injection through the water pipe 10 from the ground surface is performed using the chemical injection machine 14.
Next, after inserting the chemical injection pipe through the bored hole until reaching the sedimentation sand 12, the instantaneously setting type chemical liquid 15 from the chemical injection machine 14 is put into the sedimentation sand 12 at the disposal processing start position P1 and the disposal processing end position P2. By injecting, the sediment sand 12 at the positions P1 and P2 is partially consolidated. Here, the gel time (the time for which the injected drug solution loses fluidity and the viscosity rapidly increases) of the quick-setting type drug solution that hardens rapidly is within about 20 seconds.

Next, as shown in FIG. 3, from the ground surface at a maximum distance of about 10 m from the disposal start position P1, the chemical solution injection machine 14 is used again to perform chemical solution injection boring that reaches the water channel tube 10. After inserting the chemical injection pipe through the borehole until reaching the sediment sand 12, the chemical sand 17 is injected from the chemical injection machine 14 into the sediment sand 12, so that the sediment sand 12 in the water channel pipe 10 is discarded. It solidifies from the start position P1 to the middle part of the water pipe 10. Here, the gel time of the slow-binding type drug solution 17 is about 10 minutes or more.
Thereafter, at the disposal start position P1, using the flexible grout injection machine 16, boring for flexible grout injection reaching from the ground surface into the gap 10a of the water pipe 10 is performed.
Thereafter, the flexible grout injection pipe is inserted through the bored hole until it reaches the gap 10a of the water pipe 10, and the flexible grout 18 (or air mortar) is supplied from the flexible grout injection machine 16 to the water pipe 10. Into the gap 10a. As a result, the space 10a is filled in order with a flexible grout from the disposal start position P1 toward the middle portion of the water pipe 10 as shown in FIG.

Next, as shown in FIG. 4, the slow-coupling type chemical solution injection position is moved to a position P3 near the disposal end position P2, and the chemical solution injection machine 14 is used again to penetrate the water pipe 10 at this position P3. Boring for chemical solution injection is performed, and a chemical solution injection tube is inserted through the borehole until reaching the sedimentation sand 12, and a loose-type chemical solution is injected into the sedimentation sand 12 from the chemical solution injection machine 14. Thereby, the sediment sand 12 in the water channel pipe 10 is consolidated from the middle part of the water pipe 10 to the disposal processing end position P2.
Thereafter, as shown in FIG. 4, the flexible grout injection machine 16 can be used to reach the gap 10 a generated due to insufficient injection of grout from the ground surface into the water pipe 10 at an intermediate position of the water pipe 10. Boring for flexible grout injection.

  Thereafter, the flexible grout injection pipe is inserted into the gap 10 a of the conduit pipe 10 through the borehole, and the flexible grout (or air mortar) is supplied from the flexible grout injection machine 16 to the conduit pipe 10. It inject | pours into the cavity 10a. As a result, the inside of the gap portion 10a generated in the intermediate region of the water channel pipe 10 is filled with the flexible grout, and the remaining space portion 10a of the water pipe pipe 10 is filled with the water channel from the disposal start position P1 shown in FIG. The flexible grout is sequentially filled from the intermediate region toward the disposal end position P2 in a form similar to the filling form of the intermediate portion of the tube 10.

Next, after stopping the operation of injecting the flexible grout from the middle part of the water pipe 10, as shown in FIG. 5, the flexible grout injecting machine 16 is moved closer to the disposal end position P2, and again, The flexible grout injection boring that reaches the gap 10a (hereinafter referred to as the insufficient gap) 10a caused by insufficient injection of grout in the water channel 10 is performed.
Thereafter, the flexible grout injection pipe is inserted through the boring hole until it reaches the insufficient gap 10 a of the water channel pipe 10, and the flexible grout is transferred from the flexible grout injection machine 16 to the insufficient gap 10 a of the water pipe 10. inject. Thereby, as shown in FIG. 5, the inside of the space 10a of the water pipe 10 from the disposal start position P1 to the disposal start position P2 is completely filled with the flexible grout.

  As mentioned above, boring to reach the sediment sand in the water channel pipe with the chemical liquid injection machine from the surface located directly above the water channel pipe, and chemical liquid injection to solidify the sediment sand using the bore hole, After that, since the gap portion in the water channel pipe is filled with flexible grout or air mortar using a flexible grout injection machine, it is possible to dispose of the existing buried water pipe not currently used. It becomes possible.

Next, a conventional process for solidifying sediment sand in a water channel pipe will be described with reference to FIGS.
As shown in FIG. 6, the accumulated sand 12 deposited in the water channel pipe 10 is composed of a mixture of mud 12a and aggregate 12b. When solidifying the sedimentary sand 12 as described above, first, the boring machine reaches the inside of the water channel pipe 10 from the ground surface located directly above the water channel pipe 10, and the cleaning water is discharged using the bore hole. By pouring, the accumulated sand 12 is washed to remove the mud 12a, and the aggregate 12b is left in the water channel pipe 10 as shown in FIG. Thereafter, using a caking treatment agent injection machine, a caking agent such as air milk or air mortar (for example, a cement added with a retarder that suppresses hardening) is injected into the water pipe 10, and FIG. As shown, the inside of the water pipe 10 is filled with a caking agent. Thereby, the sediment sand in a water pipe can be solidified.

JP 2006-125053

By the way, not only earthen pipes and fume pipes but also asbestos pipes are used for existing buried water pipes. In particular, asbestos pipes have been widely used as water pipes in the 1950s and 1940s, and when asbestos pipes are broken or cracked, asbestos fibers are mixed into groundwater, and as a result, groundwater is used as drinking water. It becomes a health problem in the area where it is used. Therefore, in such a case, it is desired to stabilize the asbestos pipe so that the asbestos fibers are not mixed into the groundwater.
In addition, when removing asbestos pipes from the ground by excavation work, the work is based on the asbestos damage prevention regulations and related laws and regulations, so it is desirable to minimize the work that exposes the asbestos pipes to the ground surface.

  In addition, in the conventional disposal method of the above-mentioned canal pipe, since it is necessary to construct the boring for chemical injection and grout injection at regular intervals from the surface located directly above the existing buried pipe, Depending on the land use condition, there is a limit to chemical injection and grout injection work, and there is a problem that hinders safe and stable disposal of water pipes. In particular, when there are roads and buildings on the ground, boring for injecting chemicals and grouting is almost impossible, or land rent has to be paid.

  The present invention has been made in order to solve the above-described conventional problems, and its purpose is to dispose of a water pipe that can safely and stably dispose of an existing buried water pipe that is not currently used. It is to provide a processing method.

  In order to achieve the above object, the present invention is a method for disposing of an unused channel pipe buried in the ground, and is provided from the ground surface at one location on the ground located directly above the channel pipe. Using a shaft construction process for constructing a shaft that reaches the water channel pipe and opens to the water channel tube, and a horizontal boring drilling tube that is also used for the chemical solution injection of the horizontal boring and chemical solution injection machine installed in the ground portion in the shaft A boring hole drilling step for drilling a borehole by performing horizontal boring along the water channel pipe from the opening of the water channel pipe facing the inside of the shaft to sediment sand deposited in a lower part of the water channel pipe; When the horizontal boring is finished, the horizontal boring is performed while injecting the chemical into the sedimentary sand from the horizontal boring / chemical injection machine through the horizontal boring hole and the boring hole. A chemical solution injection step of sequentially pulling out the hole tube from the boring hole, and after the accumulated sand is consolidated with the chemical solution, a grout injection hose is inserted into the gap formed in the upper portion of the water channel tube through the opening of the water channel tube When the tip of the grout injection hose reaches the inner part of the gap, the grout is pumped through the grout injection hose over the entire interior space of the water channel pipe including the gap and the grout injection hose is pulled out. And a grout filling step of filling the internal space with grout.

  According to the water pipe pipe disposal method of the present invention, an existing buried water pipe that is not currently used can be disposed of safely and stably.

It is a fragmentary top view of the urban area where the water pipe for disposal in the past was embed | buried. It is sectional drawing which follows the AA line of FIG. 1 which shows the conventional water pipe pipe disposal process. It is sectional drawing for description which shows the conventional water pipe pipe disposal process. It is sectional drawing for description which shows the conventional water pipe pipe disposal process. It is sectional drawing for description which shows the conventional water pipe pipe disposal process. It is sectional drawing which shows the sedimentation sand state of the channel pipe for disposal processing in the past. It is sectional drawing for description which shows the treatment process of the sediment sand in the wastewater channel pipe in the past. It is sectional drawing for description which shows the treatment process of the sediment sand in the wastewater channel pipe in the past. It is a fragmentary top view of the urban area where the water pipe for disposal concerning this invention was embed | buried. It is sectional drawing which follows the BB line of FIG. 10 which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention. It is sectional drawing for description which shows the water pipe pipe disposal process concerning this invention.

Next, Embodiment 1 according to the present invention will be described in detail with reference to FIGS.
9 and 10, reference numeral 22 denotes a road built on the ground, 24 denotes a private house built on the residential land portion of the ground, 26 denotes a square built on the ground, and 28 denotes a road 22 on the side of the road 22. , And 32 is an existing unused channel pipe buried in the ground at a depth of 2 to 3 m from the surface. The water pipe 32 has a diameter of 1 to 2 m, and earth and sand containing aggregates are deposited as sedimentary sand 34 on the bottom portion in the water pipe 32.

Next, a disposal method for the water pipe 32 in the present embodiment will be described.
9 and 10, one end of the water pipe 32 in the waste processing section is set as a waste processing start position P1, and the other end of the water pipe 32 is set as a waste processing end position P2.
First, as shown in FIG. 9 and FIG. 10, one place on the ground located directly above the water pipe 32, for example, one place 20 on the ground where there is no building such as a road 22 or a house 24, A shaft 36 that reaches the pipe 32 and communicates with the inside of the water channel pipe 32 through an opening 32a formed in the peripheral wall of the water channel pipe 32 is constructed (corresponding to a shaft construction process described in claims).
Next, as shown in FIG. 11, a horizontal boring / chemical solution injection machine 38 is installed on the ground portion near the shaft 36, and the horizontal boring / borehole drilling tube 42 also used for the chemical solution injection of the horizontal boring / chemical solution injection machine 38 is used. The drilling hole is drilled by performing horizontal boring on the accumulated sand 34 deposited in the lower part of the water pipe 32 on the disposal start position P1 side from the opening 32a of the water pipe 32 toward the disposal start position P1. Corresponds to the drilling step). This horizontal boring is performed by the Grand Flex Mall method. This Grand Flex Mall method is an induction type horizontal boring technique capable of oblique, curved and straight drilling.

  Next, as shown in FIG. 11, when the boring hole formed by drilling the horizontal boring hole tube 42 reaches the disposal start position P1, the horizontal boring operation by the horizontal boring / chemical injection machine 38 is stopped, and then the horizontal boring operation is performed. The horizontal boring hole 42 is disposed at the disposal start position P1 while injecting an instantaneous type chemical into the boring hole of the accumulated sand 34 on the disposal processing start position P1 through the horizontal boring hole pipe 42 from the boring / chemical injection machine 38. As shown in FIG. 12, it is sequentially pulled out from the bored hole of the accumulated sand 34 on the side (corresponding to the chemical solution injection step described in the claims). Thereby, the instant-type chemical 40 is injected over the entire length of the sediment sand 34 along the water channel 32 on the disposal start position P1 side, and the sediment sand 34 on the disposal treatment start position P1 side is consolidated. Here, the gel time of the instant-setting type drug solution 40 that hardens rapidly (the time during which the injected drug solution loses fluidity and the viscosity rapidly increases) is within about 20 seconds.

Next, after the sedimentation sand 34 on the disposal start position P1 side is consolidated with the chemical solution 40, the tip of the grout injection hose 44 is fixed to the tip of the horizontal boring hole 42 with the fixture 44a. In this state, the grout injection hose 44 is inserted into the horizontal boring hole 42 by the horizontal boring / chemical solution injection machine 38 and the disposal processing start generated in the upper portion of the water pipe 32 on the disposal processing start position P1 side. As shown in FIG. 13, it inserts in the space | gap 321 by the side of the position P1 from the opening 32a of the water pipe 32 until it reaches the disposal processing start position P1.
Next, when the tip of the grout injection hose 44 reaches the disposal start position P1, as shown in FIG. 14, it passes through the grout injection hose 44 from the grout injection machine (not shown) in the gap 321 on the disposal start position P1 side. The waste mortar or flexible grout 46 is pumped to the waste disposal start position P1 side while the grout injection hose 44 is sequentially pulled out from the gap 321 by the horizontal boring hole 42 by the horizontal boring and chemical liquid injection machine 38. As shown in FIG. 14, the space 321 is filled with air mortar or flexible grout 46 (corresponding to the grout filling step described in the claims).

Next, if the space 321 on the disposal processing start position P1 side is filled with air mortar or flexible grout 46, the disposal processing end position opposite to the disposal processing start position P1 is opposite to the case shown in FIG. The chemical solution is injected into the water pipe 32 on the P2 side and filled with air mortar or flexible grout.
That is, as shown in FIG. 16, a horizontal boring and chemical solution injection machine 38 is installed on the ground portion near the shaft 36 opposite to the case shown in FIG. 11, and the horizontal boring and chemical solution injection machine 38 is also used for the chemical solution injection. Horizontal boring is performed on the accumulated sand 34 deposited in the lower part of the water channel pipe 32 on the disposal processing end position P2 side from the opening 32a of the water channel pipe 32 toward the disposal processing end position P2 using the horizontal boring hole pipe 42 of the above. Boring holes are drilled (corresponding to the boring hole drilling step described in claims).

  Next, when the boring hole by the drilling of the horizontal boring hole pipe 42 reaches the disposal processing end position P2, the horizontal boring operation by the horizontal boring / chemical injection machine 38 is stopped, and then the horizontal boring / chemical injection machine 38 The horizontal boring hole 42 is inserted into the boring hole of the sedimentation sand 34 on the disposal processing end position P2 side through the horizontal boring hole pipe 42 while the instantaneous type chemical solution 40 is injected into the boring hole of the sedimentation sand 34 on the disposal processing end position P2 side. Pull out sequentially from the boring hole (corresponding to the chemical solution injection step described in the claims). Thereby, the instant-type chemical solution 40 is injected over the entire length of the sediment sand 34 along the water channel pipe 32 on the disposal processing end position P2 side to solidify the sediment sand 34 on the disposal processing end position P2 side.

Next, after the sedimentation sand 34 on the disposal processing end position P2 side is consolidated with a chemical solution, the tip of the grout injection hose 44 is connected to the tip of the horizontal boring hole 42 as in the case shown in FIG. In a state where the grout injection hose 44 is fixed by the attachment 44a, the grout injection hose 44 is inserted into the upper portion of the water channel pipe 32 on the disposal processing end position P2 side by the insertion operation by the horizontal boring / chemical injection machine 38 of the horizontal boring hole 42. It is inserted into the generated gap 322 on the disposal processing end position P2 side from the opening 32a of the water pipe 32 until reaching the disposal processing end position P2.
Next, when the tip of the grout injection hose 44 reaches the disposal processing end position P2, it passes through the grout injection hose 44 from the grout injection machine (not shown) into the air gap 322 on the disposal processing end position P2 side. While the grout 46 is being pumped, the grout injection hose 44 is pulled out of the gap 322 by the horizontal boring and chemical solution injection machine 38 with the horizontal boring hole 42 being pulled out from the gap 322. As shown in FIG. 4, the mortar is filled with air mortar or flexible grout 46 (corresponding to the grout filling step described in the claims).

  According to such a method for disposing of water pipes in the present embodiment, the water pipe 32 reaches the water pipe 32 from the ground surface of the ground part at one place on the ground part located directly above the water pipe 32 and is open to the water pipe 32. A shaft 36 that communicates with the inside of the water channel pipe 32 is constructed through 32a, and the sand pipe 34 deposited on the lower part of the water channel pipe 32 using the horizontal boring technique from the shaft 36 is disposed in the disposal treatment section of the water channel pipe 32. A solidification type chemical solution is injected over the entire length to solidify, and a grout injection hose 44 is inserted into the gap formed in the upper part of the water pipe 32 using the horizontal boring hole 42 of the horizontal boring technology. After that, the air mortar or flexible grout is pumped into the gap, and the inside of the gap is filled with the air mortar or flexible grout, and the grout injection hose 44 is pulled out of the gap to Since the entire length of the water pipe 32 is filled with air mortar or flexible grout, the water pipe including the asbestos pipe is safe even if the existing buried water pipe that is not currently used is made of asbestos pipe. And it can be disposed of stably.

In addition, according to the present embodiment, since the work of cutting the water channel pipe required for injecting the chemical liquid and filling the air mortar or flexible grout is performed in the shaft 36, even if the water pipe is composed of an asbestos pipe As a result, the work that exposes the asbestos pipe to the ground surface can be kept to a minimum.
In addition, according to the present embodiment, it is not necessary to perform conventional chemical solution injection and grout injection boring in the ground, and therefore, it is possible to easily and efficiently perform the disposal of the water pipe. .

In the above-described embodiment, both of the portion of the water pipe 32 on the disposal processing start position P1 side extending in the opposite direction across the shaft 36 and the portion of the water pipe 32 on the disposal processing end position P2 side. In the above description, the boring hole drilling process, the chemical solution injection process, and the grout filling process described above have been described. However, the present invention is not limited to this, and the water pipe 32 on the disposal processing start position P1 side or the disposal processing end position P2 side. The water pipe 32 having one of the water pipes 32 can be performed in the same manner as in the above embodiment.
Further, in the above-described embodiment, the case where the accumulated sand 34 is deposited over the entire length of the water channel pipe 32 in the lower part of the water channel pipe 32 and the void is formed over the entire length of the water channel pipe 32 in the upper part of the water channel pipe 32 is described. However, the sediment sand 34 deposited in the lower part of the water pipe 32 may be divided without being continuously deposited in the longitudinal direction of the water pipe 32, and even in such a case, According to the water pipe pipe disposal method of the invention, the entire interior space of the water pipe 32 including the void formed in the upper part of the water pipe 32 can be filled with air mortar or flexible grout.

  22 …… Road, 24 …… Private house, 26 …… Square, 28 …… Street tree, 32 …… Water pipe, 321,322 …… Gap, 32a …… Opening, 34 …… Sediment sand, 36 …… Stand, 38 ... Horizontal boring and chemical injection machine, 40 ... chemical solution, 42 ... horizontal boring drill tube, 44 ... grouting hose, 46 ... air mortar or flexible grouting.

Claims (5)

A method of disposing of unused water pipes buried in the ground,
A shaft construction step of constructing a shaft that reaches the water channel pipe from the surface and opens to the water channel pipe at one place on the ground located directly above the water pipe;
In the vertical shaft, the water channel pipe facing the inside of the vertical shaft on the sand accumulated in the lower part of the water channel pipe using the horizontal boring drilling pipe for the chemical liquid injection of the horizontal boring and chemical liquid injection machine installed on the ground part. A boring hole drilling step of drilling a boring hole by performing horizontal boring along the water channel pipe from the opening of the accumulated sand;
When the horizontal boring is completed, the horizontal boring drilling pipe is sequentially pulled out from the boring hole while injecting the chemical into the sedimentary sand through the horizontal boring drilling pipe and the boring hole from the horizontal boring and chemical pouring machine. An injection process;
After the accumulated sand is consolidated with a chemical solution, a grout injection hose is inserted into the gap formed in the upper part of the water pipe from the opening of the water pipe, and the tip of the grout injection hose is deep inside the gap. A grout filling step of filling the internal space with grout while pulling out the grout injection hose and pumping out the grout through the grout injection hose through the grout injection hose when reaching the part,
A method for disposing of water pipe pipes. The tip of the grout injection hose is attached to the tip of the horizontal boring hole tube,
Inserting the grouting hose into the upper part of the water channel pipe and pulling it out from the upper part is performed by inserting and pulling out the horizontal boring hole pipe,
The water channel pipe disposal method according to claim 1. In the water pipe portions extending in opposite directions across the shaft, the above-described boring hole drilling step, chemical injection step, and grout filling step are performed, respectively.
The method for disposing of water pipes according to claim 1 or 2.   The water channel pipe disposal method according to any one of claims 1 to 3, wherein the shaft is constructed from an above-ground part having no roads or buildings. The water channel pipe disposal method according to any one of claims 1 to 4 , wherein the chemical liquid is a quick-setting type that quickly solidifies.

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