JP3511429B2 - Replacement of existing buried pipes - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fume pipes, ceramic pipes, vinyl chloride pipes, and FRs used as water and sewage pipes.
The present invention relates to a method of replacing existing pipes such as P pipes with new pipes without cutting. 2. Description of the Related Art As a method of replacing a buried pipe with a new pipe without cutting, for example, Japanese Unexamined Patent Publication No. Hei 7-286682 is known. [0003] In this method, a starting shaft is provided on one side of a replacement section for replacing a new pipe in an existing buried pipe, and a reaching shaft is provided on the other side thereof. This is a method of excavating from a starting shaft by using an excavator in the existing buried pipe or along the buried pipe, and propelling and laying a new pipe. In the above-mentioned construction method, since the inside of an already buried pipe is brought into a state close to the surrounding ground pressure state with a plugging material and then excavated by an excavator, the ground for guiding the excavator in front of the new pipe is oriented. A reaction force equivalent to the pressure can be obtained from the plugging material, and accurate construction can be expected without restricting the combination of the diameters of the buried pipe and the new pipe. [0005] In addition, even in the case of renewal of the expanded diameter, the space required for laying the new pipe is replaced by a new pipe while securing the space by discharging the soil, so that even a relatively large diameter can be constructed without adversely affecting the road surface and the like. Become. Further, when the existing pipe has a non-landing part due to aging, the new pipe can be properly buried along the planning line, and in this case, a cavity is formed around the new pipe. There is no road surface collapse after construction. [0007] Generally, an already buried pipe is buried by digging. For example, as shown in FIG. 7, a buried trench 1 is excavated, a pipe 2 is laid in the buried trench 1, and soil 3 is backfilled. [0008] Since the above-mentioned backfilling soil 3 generally uses mountain sand or excavated soil (open soil), the soil 3 around the buried pipe 2 (already buried pipe) is used. The supporting force (N value, compressive strength) of the ground is a small value. For this purpose, as shown in FIG.
Even if the inside is the same as the surrounding ground pressure by the blocking material 4,
Excavation reaction force of the excavator 5 cannot be supported by the surrounding ground, and the straightness of the excavator 5 cannot be maintained. Accordingly, an object of the present invention is to provide a method of replacing a buried pipe which can solve the above-mentioned problems. The present invention is directed to a replacement section for replacing a new pipe in the buried pipe 10 with a new section.
Start shaft 11 on the side and reach shaft 12 on the other side.
In this state, a filling material for improving soil support is injected into the inner and outer peripheral portions of the buried pipe 10 so that the inner and outer peripheral parts of the buried pipe 10 have substantially uniform and sufficient supporting force. After that, the propulsion unit 14 and the propulsion unit 14
Excavator 13 with propulsion and rotary driven excavator 15
From the starting shaft 11 to the reaching shaft 12
By rotating from the above, the previously buried pipe 10 is cut,
This is a method of replacing an existing buried pipe, wherein the existing pipe 10 is replaced with the new pipe 29 by erecting and embedding a new pipe 29 in a cut portion . According to the present invention, the buried pipe 10 is connected to the excavator 1
While propelling by the propulsion unit 14 while rotating the excavation unit 15 of No. 3
When excavating from the inside, the inside and outer periphery of the buried pipe 10 are filled
Since the material has a substantially uniform and sufficiently large supporting force due to the material , the excavating reaction force of the excavating portion 15 of the excavator 13 is substantially reduced by the inner and outer peripheral portions of the buried pipe 10. Supported uniformly. [0013] As described above, since the supporting force of the ground on the outer peripheral portion of the buried pipe 10 becomes large , the
You can maintain aggressiveness. Also, already buried even buried Shinkan 29 from the rear while drilling the already buried pipe 10 by excavator 13
Since the pipe 10 is in a fixed state, the rotation of the excavation part 15
The new pipe 29 can be buried efficiently without being moved by the excavation force caused by the excavation. In addition, since the filling material is also injected into the inside of the buried pipe 10, the center of the buried pipe 10 and the excavator 13
Even if the center of the excavation part 15 is shifted, it is uniformly supported in the rotation direction.
Even when the new pipe 29 is buried in a direction different from that of the buried pipe 10, the excavation reaction force of the
Since the excavator 13 is supported almost equally irrespective of the presence or absence of zero, the excavator 13 can excavate along the planning line and bury the new pipe 29 correctly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Shaft 11 on one side of the replacement section to replace the new pipe in
Is provided, and the reaching shaft 12 is provided on the other side. An excavator 13 is installed in the starting shaft 11. The excavator 13 includes a propulsion unit 14 such as a cylinder.
And an excavating unit 15 propelled by the propelling unit 14 and driven to rotate. The excavation part 15 is a main body 15
The rotary unit 15b provided with a cutter is mounted so as to be swingable in a 360-degree direction by a vertical swing cylinder and a left-right swing cylinder (not shown). The excavator 13 is conventionally known as a small-diameter pipe propulsion machine. As shown in FIG. 2, a filler 21 is injected into the inner and outer peripheral portions of the buried pipe 10 near the starting shaft 11 by a chemical injector 20. The liquid injector 20 is provided with a hollow rod 23 in a machine body 22 so as to be vertically movable and rotatable. A cutter 24 and a spout 25 are provided at the tip of the rod 23 so that the rod 23 is filled. The material is fed under pressure and spouted from the spout 25. In order to inject the filler 21 by the chemical injector 20, the rod 23 is lowered while rotating, and the cutter 24 and the ejection port 25 are projected into the buried pipe 10. In this state, the filler is pressure-fed into the rod 23 while being raised, and is ejected from the ejection port 25 to be injected into the inside and the outer periphery of the buried pipe 10. By doing so, as shown in FIG. 3, the filler 27 is injected into the backfill soil 26 inside and outside the buried pipe 10, and the backfill soil 26 around the outside is improved in ground. Large supporting force in the inner and outer periphery of the buried pipe 10
Value . The chemical liquid injector 20 is moved at a predetermined distance toward the arrival shaft 12, and the filling material injection operation is repeated a plurality of times in the same manner as described above, so as to extend over the entire replacement section of the buried pipe 10 as shown in FIG. The filling material 27 is injected. The filler 27 may be, for example, an alkaline suspension type such as cement or slag cement, or a non-chemical type such as cement milk or cement / bentonite, that is, a material for improving the soil bearing capacity. Good. The propulsion unit 14 propells the excavation unit 15 while rotating the rotating unit 15b of the excavation unit 15 to excavate the already buried pipe 10, and when the excavation unit 15 protrudes a predetermined stroke, the propulsion unit 14
And the excavated traces 28 of the buried pipe 10 as shown in FIG.
The new pipe 29 is pushed in by the propulsion unit 14, and the excavation unit 15 is propelled by the new pipe 29. The above operation is repeated a plurality of times to bury the buried pipe 1
0 is replaced with the new tube 29. As described above, the inner and outer peripheral portions of the buried pipe 10 have a large supporting force due to the filler, so that the cutting reaction force of the excavating portion 15 is supported and the straightness of the excavator 13 can be maintained. . As shown in FIG. 6, when the center of the buried pipe 10 is deviated from the center of the excavator 13 (the digging section 15), the excavation reaction force of the digging section 15 is reduced. The soil whose ground has been improved by the filler 27 and the filler 27 inside the buried pipe 10 can be uniformly supported in the rotation direction. In order to inject the above-mentioned filler 27, the starting shaft 11 or the reaching shaft 12 may be horizontally injected into the inner and outer peripheral portions of the buried pipe 10, or may be injected from the starting shaft 11 or the reaching shaft 12. Injection may be performed from the inside of the buried pipe 10 to the outside, or further, may be performed from the starting shaft 11 or the reaching shaft 12 into the buried pipe 10 and may be performed from the ground to an outer peripheral portion of the buried pipe 10. good. In the above embodiment, the new pipes 29 are sequentially buried while cutting the buried pipes 10. However, the buried pipes 10 are cut over the entire length of the replacement section, and then the new pipes 29 are buried. Is also good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a state where a shaft and an excavator according to an embodiment of the present invention are provided. 2 is a sectional view showing a state in which injection of filler material starting shaft pit portion close. FIG. 3 is a sectional view taken along line AA of FIG. 2; FIG. 4 is a sectional view showing a state in which a filler is injected into the entire length of the replacement section of the buried pipe. FIG. 5 is a cross-sectional view showing a state immediately before propulsion burying a new pipe. FIG. 6 is an explanatory diagram of a cutting state of an already buried pipe by an excavator. FIG. 7 is a cross-sectional view of an already buried pipe buried by an open-cutting method. FIG. 8 is an explanatory diagram of a defect according to a conventional example.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 1/024

Claims (1)

(57) [Claims] [Claim 1] Replace the existing pipe (10) with a new pipe.
Shaft (11) on one side of the replacement section, reaching shaft on the other side
(12) is provided, and a filling material for improving the soil supporting force is injected into the inner and outer peripheral portions of the buried pipe (10) so that the inner and outer peripheral parts of the buried pipe (10) are substantially uniform and sufficient. A state of having a supporting force of a certain magnitude, and thereafter, the propulsion unit (14) and the propulsion unit (14)
Excavation with rotary driven excavator (15) to be propelled
Machine (13) from the starting shaft (11) to the reaching shaft (12)
By rotating while propelling toward
(10) is cut, and a new pipe (29) is erected and buried in the cut portion to replace the buried pipe (10) with a new pipe (29). Pipe replacement method.