JPH07103779B2 - Pipe Propulsion Construction Water Stop Method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stoppage method at a pipe propulsion work pit, and in particular, it is installed at a pipe propulsion pit where a plurality of propulsion pipes or buried pipes are inserted or inserted, and muddy water is introduced from the periphery of the pipe into the shaft. The present invention relates to a water stopping method at a pipe propulsion pit that is installed so as to cover the outer surface of the propulsion pipe or the buried pipe so that ground water, collapsed earth and sand, etc. do not flow out or spout.

[0002]

2. Description of the Related Art Conventionally, in the case of laying a pipeline by a pipe propulsion method, an excavated vertical shaft is used as a starting pit, and an original pushing device is installed in the shaft to excavate at a tip rotating portion of the tip propulsion device. While pushing it, push the propulsion pipe into the ground by the propulsion jack, and while continuing to add the propulsion pipes one by one, proceed with this, and if the tip propulsion device reaches the inside of the reached vertical shaft, the tip is reached at the final vertical shaft. Remove the propulsion device,
A pipe line is installed by attaching a retracting device, connecting an embedded pipe to the retracting device, and continuously connecting the embedded pipe while pulling in the propulsion pipe from the starting shaft side. In this case, the propulsion pipe and the buried pipe are inserted or inserted in the pipe propulsion work pit provided on the wall sheet pile of the starting shaft and the reaching shaft, but the pit and the propulsion pipe or the buried pipe cannot be completely adhered to each other. Therefore, an entrance box has been conventionally installed at the wellhead.

A conventional entrance packing device is shown in FIG.
Further, as shown in FIG. 6, it is attached to the portion of the wellhead 3 which is opened in the sheet pile 2 constituting the side wall of the vertical shaft 1. This entrance packing device has an annular casing 4 having a U-shaped cross section that is fixed to the seat pile 2, and parallel ring flanges 5 and 5 of the annular casing 4 are fitted with donut disc-shaped rubber ring packings 6 and 6, respectively. It was. In this entrance packing device, when the buried pipe 7 is propelled from the wellhead 3 to the natural ground 8, the rubber ring packing 6 adheres to the buried pipe 7 and the outer peripheral surface of the buried pipe in a bent state (see the phantom line in FIG. 6). ), Mud water, groundwater, etc. are prevented from entering the shaft 1 from the natural ground 8 side.

[0004]

However, in the above-mentioned conventional entrance packing device, the rubber ring packing 6 is used.
Therefore, there is a problem that good adhesion cannot be obtained unless the outer peripheral surface shapes of the propulsion pipe 28 and the buried pipe 7 are perfectly circular. That is, the rubber ring packing 6 is integrally molded, and usually has a size corresponding to the outer shape of the pipe, and is conventionally molded into a donut type disk having a concentric inner diameter and an outer diameter. Therefore, it was effective when the tube had a circular cross section. However, when there is unevenness in the outer shape of the pipe to be propelled, for example, when the embedded pipes are laid multiple times at one time and the outer shape of the embedded pipe group becomes uneven by bundling the pipes, the entrance punkin device There was a risk that groundwater etc. would be gushed out because the water stopping effect could not be obtained. In such a pipe laying method using a propulsion pipe and a buried pipe with irregularities on the outer periphery, when the entrance packing device as described above is used, a gap between the rubber packing and the propulsion pipe or the buried pipe, or between the propulsion pipe or the buried pipes There was a problem that muddy water, groundwater, collapsed earth and sand, etc. flowed out or spouted from the gap into the shaft.

It is an object of the present invention to provide a water-stopping method capable of exhibiting sufficient water-stopping performance regardless of the external condition of the pipe, focusing on the above-mentioned conventional problems.

[0006]

In order to achieve the above-mentioned object, the present invention installs a propulsion pipe and a buried pipe in a non-cutting propulsion method at a pipe propulsion work pit to be inserted or extracted, and Runoff of groundwater and sediment collapse
In the water-stopping method for preventing jetting, if the outer shape of the single or multiple bundled propulsion pipes and buried pipes has irregularities, provide a hole on the central axis to the extent that the pipes can pass through Or, using an entrance box provided with a plurality of partition plates, in the entrance box, a rubber packing is attached to the partition plate and the end of the entrance box, and when the pipe is inserted / removed, in the gap between the rubber packing and the pipe. Clay-like plastics such as bentonite are packed and closed, and then the hollow part in the entrance box is filled with a liquid waterproofing material having gel time and flexibility when solidified, and then solidified. Characterized by injecting a liquid waterproof material with another gel time into the ground that contacts the box and solidifying it Water stopping construction method in promoting Engineering wellhead in which mode of the invention.

[0007]

According to the above construction method, since the rubber packing and the flexible waterproof material are used as the packing member that comes into contact with the outer surface of the pipe, even if the outer shape of the pipe is uneven. Since it has sufficient shape-following property, it has high waterproofness. Furthermore, by injecting a water blocking material into the ground portion, the ground portion can also be a packing member that continuously contacts the outer surface of the pipe as well as the entrance box. Have.

[0008]

EXAMPLES Next, examples of the present invention will be described. Needless to say, the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

FIGS. 1A and 1B show an embodiment of a reaching shaft, where FIG. 1A is a front view and FIG. 1B is a sectional view. Figure 1
In (a), 22 is a sheet pile, 23 is a hole for passing a buried pipe, 24 is a hole for injecting a waterproofing material, 28 is a propelling pipe, 16 is a natural ground, 21 is a reach in FIG. 1 (b). A vertical shaft, 22 is a sheet pile, and 28 is a propulsion pipe. Before the propulsion pipe 28 propelled from the starting shaft reaches the reaching shaft 21, FIG.
As shown in FIG. 2, the sheet pile 22 of the reaching shaft has a hole 2 for passing a buried pipe having a diameter slightly larger than the outer peripheral surface of a plurality of buried pipes arranged to surround the propulsion pipe 28.
3 is provided further above the hole 23 for injecting the waterproof material.
4 is provided.

2A and 2B show an embodiment in which the retracting device 25 and the buried pipe 9 are attached to the propulsion pipe 28. FIG. 2A is a front view, FIG. 2B is a sectional view, and FIG. 2C is an entrance box. A perspective view is shown.

In FIG. 2 (a), 11 is an entrance box, 9 is a buried pipe, 10 is a buried port, 15 is a rubber packing, 19 is a bolt, 20 is a bentonite plastic body filled, and 24 is a water blocking material injection. Shows the hole.

In FIG. 2 (b), 9 is a buried pipe, 10 is a buried port, 11 is an entrance box, 12 is a water blocking material,
13 is a partition of the entrance box 11, 15 is rubber packing, 16 is a ground, 17 is a surface where the entrance box contacts the ground, 18 is a steel plate, 19 is a bolt for attaching the steel plate, 20 is a bentonite plastic body, 21 Is a vertical shaft, 22 is a sheet pile, 24 is a hole for injecting the waterproof material, 25 is a retractor, 26 is a funnel, and 28 is a propulsion pipe. FIG. 2C shows an entrance box, in which 10 is an embedding opening, 13 is a partition, and the upper part is open.

As shown in FIG. 2, when the propulsion pipe 28 reaches the reaching shaft 21, a retraction device 25 is attached to the tip of the propulsion pipe 28, and a plurality of buried pipes 9 are attached to the retraction device 25. These pipes and devices are propelled in the direction of the starting shaft for about 1 m (to the left in the figure). The void portion around the buried pipe 9 generated in the ground 16 for propulsion is back-filled with earth or the like from the hole provided in the sheet pile 22. After that, the rubber packing 15 is attached to the burial opening 10 of the entrance box 11 and the partition portions 13 at several places, sandwiched between the steel plates 18, and fixed at several places by the bolts 19. A plurality of embedding pipes 9 are passed through the embedding port 10 of the entrance box 11 and the holes of the partition plate, and the ends of the entrance box 11 are welded to the sheet pile 22. The void between the buried pipe 9 and the passage of the buried pipe 9 on the surface 17 of the entrance box 11 that contacts the natural ground 16 is filled with the bentonite plastic body 20 prepared by mixing bentonite or the like with an appropriate amount of water. After the bentonite plastic body 20 is hardened, a funnel 26 or the like is used to inject the water-stopping material 12 which is liquid before solidification into the ground 16 through the holes 24 for injecting the water-stopping material. A partition 13 at the center of the entrance box 11 and a buried opening 10
The space between the rubber packing 15 attached to the inner wall and the buried pipe 9 is sealed by the bentonite plastic body 20 manufactured as described above so that the water blocking material 12 does not flow out of the entrance box 11. After that, the same liquid waterproofing material 12 as described above is injected into the entrance box 11. After the water blocking material 12 is solidified, the lid 27 of the entrance box 11 is attached to the entrance box 11 so that the water blocking material 12 expanded by the solidification and the pipe propulsion does not pop out.

Especially when the buried pipe 9 is laid in multiple rows, water easily leaks between the pipes, and therefore the entrance box 11 is used.
The inside must be sufficiently filled with the water blocking material 12. Therefore, the liquid waterproof material 12 before solidification is applied to the entrance box 11
The filling property is improved by injecting it from above into the inside.
Further, since the water blocking material 12 becomes an elastic body after solidification,
Even when the recessed and projected portions such as the connection socket 34 pass through the inside of the entrance box 11 in the buried pipe, there is sufficient conformability. However, it is preferable that the connection sockets 34 do not overlap.

When the buried pipe 9 is propelled, a force in the propelling direction acts on the water blocking member 12 due to the pipe frictional force or the resistance of the uneven portion of the pipe connecting socket 34 or the like. Since the water blocking material 12 has elasticity, the water blocking material 12 will not move while the buried pipe 9 is being propelled.
A phenomenon occurs in which the water blocking material 12 that is dragged and deformed is restored when it is dragged by and when the propulsion is stopped. If the distance between the walls of the entrance box 11 in the propulsion direction is long, the movement distance of the water blocking material 12 dragged by the buried pipe 9 becomes long, so the water blocking material 12 cannot be sufficiently restored when the propulsion is stopped. There is a possibility that voids will be generated and the water blocking property will be reduced. Therefore, the partition 13 is provided at the center of the entrance box 11 and the inside of the entrance box 11 has a multi-layered structure, so that the movement amount of the water blocking material 12 dragged by the buried pipe 9 is reduced and the water blocking ability is maintained. Is increasing. In addition, a burial opening 10 that serves as a passage for the burial pipe 9 at the center of the entrance box 11, a partition portion 13, and a natural ground 1
The passage of the buried pipe 9 on the surface in contact with 6 is larger than the buried pipe 9 because the buried pipe 9 has irregularities such as the socket 34, and the water is stopped from the gap between these holes and the buried pipe 9. Material 1
2 may leak out. In order to prevent this, a rubber packing 15 is provided at the burial opening 10 of the entrance box 11 and the partition 13 at the center of the box to prevent the water blocking material 12 of each layer in the entrance box 11 from flowing out while the socket 34 of the burial pipe 9 or the like. It is devised to enhance the conformability to the unevenness of the. Since the rubber packing 15 is filled with the waterproof material in the ground, it is not necessary to mount the rubber packing 15 on the passage of the buried pipe 9 on the surface where the entrance box 11 contacts the ground, as shown in FIG. The water blocking material 12 injected into the ground material 16 is solidified to be integrated with the soil particles of the ground material 16, and the rigidity of the integrated ground material 16 causes the ground material of the water blocking material 12 in the entrance box 11. The outflow to the mountain 16 can be prevented. Also, entrance box 1
If the water is stopped only by 1, the muddy water may be transmitted to the outer peripheral surface of the entrance box 11 and flow out into the reaching shaft 21, but since the integrated ground 16 has a water stopping effect, It can prevent the outflow of muddy water.

As described above, when the pit mouth of the reaching shaft is stopped, the pressure of muddy water is also applied to the starting shaft,
Muddy water may flow along the outer surface of the propulsion pipe and flow out into the starting shaft. For this reason, it is necessary to use this water shutoff method also on the side of the starting shaft. Next, the use of the water stop method for the starting shaft will be described with reference to FIGS. 3 and 4.

3A and 3B are views for explaining the construction method of the present invention from the start of propulsion of the propulsion pipe to the retracting of the buried pipe retracting device to the vicinity of the starting shaft. FIG. 3A is a sectional view and FIG. 3B is an exploded perspective view. (C) shows the perspective view of an entrance box. In FIG. (A), 11 is an entrance box, 12 is a waterproof material, 15 is rubber packing, 16 is a ground, 19 is a bolt, 22 is a sheet pile, 29 is a guide pipe, and 33 is a starting shaft. In FIG. 2B, 29 is a guide pipe, 15 is a rubber packing, and 30 is a holding plate (steel plate).

FIG. 4 is a sectional view of the present method after the retractor has approached the starting shaft. In FIG. 4, 16 is a natural ground,
Reference numeral 9 is a buried pipe, 25 is a retraction device, 28 is a propulsion pipe, 11 is an entrance box, 31 is a rubber packing, 32 is a holding plate, and 33 is a starting shaft.

Next, the construction method will be described. Similar to stopping water in the reaching shaft, the seat pile 22 is pushed before the propelling pipe 28 is propelled.
A hole 23 for passing a propulsion tube is provided in the entrance box 11, and the entrance box 11 is welded to the seat pile 22. A guide pipe 29 which is divided in half is attached to the entrance box 11.
At this time, the guide pipe 29 is attached in order to prevent the entry of muddy water, earth and sand, etc. into the entrance box 11 due to the pulling in. Because of this guide pipe 29,
It is not necessary to inject the waterproofing material 12 into the natural ground 16. Buried pipe 9
When the buried pipe 9 reaches the starting shaft 33, the outer peripheral surface of the buried pipe group is larger than the propulsion pipe 28.
The buried pipe 9 cannot pass through the guide pipe 29. Therefore,
Immediately before the buried pipe 9 passes through the entrance box 11, it is necessary to increase the diameter of the exit of the entrance box 11. For this reason, since it is necessary to remove the guide pipe 29, the guide pipe is divided in half so that it can be disassembled. The rubber packing 15 is attached to the guide pipe 29, and for the same reason as described above, the rubber packing 15 is sandwiched between a set of half-divided steel plates (holding plates) 30 and the guide pipe 29, and the bolts 19 are fixed at several places. Similarly to the above, the space between the guide pipe 29 and the buried pipe passage hole 23 is filled with the bentonite plastic body 20, the water blocking material 12 is injected into the entrance box 11, and the lid 27 is attached to the upper part of the entrance box 11. . When the retracting device 25 of the buried pipe 9 approaches the distance of about 1 m from the entrance box 11, the steel plate 30 and the guide pipe 29 are removed, and the hollow diameter of the rubber packing 15 is expanded to a degree slightly smaller than the diameter of the buried pipe 9 group. Attach the rubber packing 31,
Further, a half steel plate 32 having a size slightly larger than the diameter of the retracting device 25 is attached and filled with the bentonite plastic body 20 in the same manner as described above, and the water blocking material 12 is filled with the entrance box 11.
Then, the buried pipe 9 is pulled into the starting shaft 33.

[0020]

As described above, according to the present invention,
Since a flexible waterproof material is used for the packing that seals the propulsion pipes and the buried pipes of the entrance packing device, even when the buried pipes are laid in multiple rows, even if there are irregularities in the outer shape of the pipes, a high stoppage is achieved. Water effect will be obtained. Further, by injecting the water blocking material into the natural ground portion, it is possible to reduce the water blocking action due to the promotion of the pipe and suppress the outflow of muddy water around the entrance box.

[Brief description of drawings]

FIG. 1 is a diagram mainly illustrating an embodiment of a sheet pile using the present invention in a reaching shaft, (a) is a front view, and (b) is a sectional view.

FIG. 2 shows an embodiment of the present invention in which an entrance box is used in a reaching shaft, (a) is a front view, (b) is a partial sectional view, and (c) is a perspective view of the entrance box. .

FIG. 3 shows an example in which the present invention is used in a starting shaft,
(A) is sectional drawing, (b), (c) is a perspective view.

FIG. 4 shows a sectional view of an embodiment in which the present invention is used in a starting shaft.

FIG. 5 shows a cross-sectional view of a conventional example.

FIG. 6 shows a cross-sectional view of a conventional example.

[Explanation of symbols]

 1 Vertical shaft 2 Sheet pile 3 Well mouth 4 Annular casing 5 Flange 6 Packing 7 Buried pipe 8 Ground rock 9 Buried pipe 10 Buried mouth 11 Entrance box 12 Water stop material 13 Partition part 15 Rubber packing 16 Rock mass 17 Surface contacting with rock ground 18 Steel plate 19 bolt 20 bentonite plastic body 20 21 reaching shaft 22 sheet pile 23 hole for passage of buried pipe 24 hole for injecting waterproofing material 25 retractor 26 funnel 27 lid 28 propulsion pipe 29 guide pipe 30 presser plate (steel plate) 31 rubber packing 32 Holding plate (steel plate) 33 Starting shaft 34 Socket

Claims (1)

[Claims] 1. A non-excavation propulsion method is used to install a propulsion pipe and a buried pipe in a pipe propulsion work pit that is inserted or inserted to prevent runoff / spout of mud water, groundwater, and ground collapsed soil from the pit. In the water-stopping method, when the outer shape of one or more bundled propulsion pipes and buried pipes has irregularities, a hole is provided on the central axis to the extent that the pipes can pass through, and one or more partition plates are provided in the middle part. Using the entrance box provided with, in the entrance box, a rubber packing is attached to the partition plate and the end of the entrance box, and when the pipe is inserted / removed, a clay shape such as bentonite is formed in a gap between the rubber packing and the pipe. It is filled with a plastic material to close it, and then the hollow part inside the entrance box has a gel time and is a liquid that has flexibility when solidified. It is characterized in that it is filled with a water blocking material to solidify it, and then a liquid water blocking material with another gel time is injected into the ground in contact with the entrance box to solidify it. Water method.