JPH11247592A - Pipe jacking method for preceding intermediate shaft system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe jacking method in which sewage pipes or the like are jacked to a target point, in order to embed the pipes in the underground. SOLUTION: An intermediate shaft 3 is constructed in the middle position of a starting shaft and an arrival shaft before the front end jacking device 2 arrives. When the front end jacking device 2 arrives at the liner of the intermediate shaft 3, the position of the front end jacking device 2 is confirmed and the base line in the shaft is measured and then, an entrance for the arrival shaft and an entrance for the starting shaft are formed in the intermediate shaft 3. A base frame is installed at the bottom of the intermediate shaft 3 and the lower half part of a protection pipe is mounted thereon. A face on which an opening allowing the front end jacking device 2 to pass through to the liner is opened along the inner periphery of the entrance for the arrival shaft to send the front end jacking device 2 toward the intermediate shaft 3. And also a face on which an opening allowing the front end jacking device 2 to pass through to the liner 4 is opened along the inner periphery of the starting shaft and the jacking device 2 is advanced to the outside of the intermediate shaft 3. An upper half part is mounted on the lower half part of the protection pipe and filling materials are injected into the sealed protection pipe and thereafter, a pipe body 1 is continued to jack.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of a pipe propulsion method in which, for example, when a sewer pipe or the like is buried underground, the pipe is propelled and installed toward a target point in the ground. For example, an intermediate shaft, which is provided for the necessity of providing a manhole or the like between the starting shaft and the reaching shaft, is provided prior to the propulsion of the pipe, and the pipe is propelled so as to penetrate the intermediate shaft. Pipe construction method.

[0002]

2. Description of the Related Art Conventionally, various pipe propulsion methods are known and well known. Regarding the construction of intermediate shafts that are provided for each fixed pipe length due to the need for manholes, etc., there are two main methods: the method of excavating after the propulsion (passing) of the pipe and the method of providing the intermediate shaft in advance. Separated. In the latter method, after passing through the tip propulsion device in the constructed intermediate shaft, it is left as it is without sealing with a protective tube. In the constructed middle shaft, after passing through the tip propulsion device, instead of sealing with a protective tube, immediately backfill the shaft with a suitable backfill material to the required height, propelling and passing the tube in it, How to restore the shaft again. In the constructed intermediate shaft, after passing through the tip propulsion device, instead of sealing with a protective tube, immediately fill the same shaft with liquid such as muddy water, propelling and passing the tube in it,
Then restore the shaft again. Are roughly divided into

[0003]

[Problems to be Solved by the Invention] I) Problems with the Method of Excavating and Providing an Intermediate Shaft after Propulsion (Passing) of a Pipe When excavating an intermediate shaft, a buried pipe becomes an obstacle, and a liner for mountain retaining to be constructed The installation of the plates will be done by assembling a set of multiple plate pieces that have been geometrically analyzed by analyzing the intersection (intersection ridge) between the vertical shaft and the horizontal buried pipe, and processing and assembling the plates. However, it is very troublesome and time-consuming, and due to the structure of the shaft using the liner plate, a large defective portion weakens the strength of the shaft. When excavating a shaft, it is common to perform ground improvement before pipe propulsion, but after the tip propulsion device has passed under the shaft, the ground is disturbed and water sticks. Therefore, supplementary ground improvement is performed, but the ground improvement in the vicinity or below may be insufficient due to the presence of the buried pipe. As a result, in the ground with a high groundwater level, the excavation work progresses greatly due to the collapse and runoff of the ground, and the construction period may be prolonged or a collapse accident may occur in the surrounding area, making construction difficult. Excavation in the vicinity and below the buried pipe must be done by hand digging, and in this sense the construction is troublesome and prolonged.

[0004] Since the diameter of the two intermediate shafts is as small as about 3700 to 4500 mm compared to the outer diameter (2350 mm) of the buried pipe, there is also a difficulty that a sufficient working space cannot be obtained and the above problems are duplicated. . II) The problem of a method in which an intermediate shaft is provided in advance, and the pipe is propelled and passed, and then left as it is after passing through the pipe for a long period of time. There is a danger that foreign materials such as boulders will be trapped between the entrance packing and the pipe, thereby damaging the entrance packing. In this case, in the ground with a high groundwater level, earth and sand and groundwater flow out from the gap, which leads to the collapse of the ground, and there is a possibility that the surrounding ground may sink or sink. III) Although an intermediate shaft is provided in advance, the problem of backfilling with an appropriate backfill material until the pipe is propelled and passed is a compromise that solves the problem of II) above. The advantages and disadvantages are half-way, but once the excavated and constructed intermediate shaft is backfilled until the pipe is propelled and passed,
The drawback of the duplication of the process and the trouble twice is inevitably large. In addition, it is necessary to stop the pipe propulsion work until the backfill is completed, which requires a large thrust when re-excavating. Further, when there are cut beams or the like in the shaft, backfilling is difficult. I
V) An intermediate shaft is provided in advance, but the problem is that the pipe is filled with liquid such as muddy water until the pipe is propelled and passed. This method is to solve the problems of II) and III) above. Immediately after the installation of the wellhead and the passage of the pipes, the shaft can be refilled immediately with liquid such as muddy water, but the buoyancy acting in the liquid is applied to the exposed pipes. Otherwise, the pipe may meander and twist, or the pipe may be damaged by an unexpectedly large bias.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve an intermediate shaft leading type pipe propulsion in which the advancement and construction of the intermediate shaft is preserved, and the pipe propulsion and passage can be performed safely and efficiently in a short period of time. Is to provide construction.

[0006]

As a means for solving the above-mentioned problems, an intermediate shaft leading type pipe propulsion method according to the first aspect of the present invention comprises a main pushing device and a tip propulsion device installed in a starting shaft. In the pipe propulsion method of propelling the pipe toward the arrival shaft by the cooperation with the above, to construct an intermediate shaft through which the pipe passes at an intermediate position between the start shaft and the arrival shaft before the tip propulsion device reaches At the stage where the tip propulsion device reached the liner of the middle shaft, the position of the tip propulsion device was confirmed and the baseline of the shaft was measured, and based on the measurement results, the arrival well and the start well were placed in the middle shaft. Installing, installing a gantry at the bottom of the intermediate shaft, attaching the lower half of the protective tube that connects the reaching wellhead and the starting wellhead, the tip propulsion device to the liner along the inner circumference of the reaching wellhead Passed through To make the tip propulsion device advance into the middle shaft, perform the mirror cutting to provide an opening for passing the tip propulsion device through the liner along the inner circumference of the starting shaft, Going out of the shaft, mounting the upper half on the lower half of the protective tube, injecting the filler into the sealed protective tube, and then continuing to propel the tube. Each feature. This is a so-called wellhead method.

According to a second aspect of the present invention, there is provided an intermediate shaft leading type pipe propulsion method according to the first aspect, in which reinforcing concrete is poured into the arrival wellhead and the start wellhead, and the tip propulsion device passes through the arrival wellhead. Before entrance and before proceeding to the starting wellhead, install entrance packing at each wellhead, pass it through the tip propulsion device, seal it with a protective tube, and fill the gap with fast-curing or normally hardening filler. It is characterized by the following.

[0010] According to a third aspect of the present invention, in the intermediate shaft leading type pipe propulsion method according to the first aspect, the arrival port and the start port are provided before the tip propulsion device is passed through the arrival port and to the start port. An entrance packing is attached to each wellhead before moving forward, and the entrance packing is passed through the tip propulsion device, then sealed with a protective tube, and the gap is filled with a fast-curing or normally hardening filler.

According to a fourth aspect of the present invention, there is provided a pipe propulsion method in which a pipe body is propelled toward an arrival shaft by the cooperation of a main pushing device and a tip propulsion device installed in a starting shaft. In the construction method, at the intermediate position between the starting shaft and the reaching shaft, construct an intermediate shaft through which the pipe passes before the arrival of the tip propulsion device, and perform the following preparations, based on the scheduled passage position of the tip propulsion device. Survey the baseline of the middle shaft, install a gantry on the bottom of the middle shaft based on the above survey results, attach the lower half of the protective tube and both ends of the tube on it, Making a mirror cut along the inner circumference of the end to provide an opening for the tip propulsion device to pass through the liner, attaching the upper half of the protective tube, and injecting the filling material into the inside of the sealed protective tube thus closed. After completing the preparation , To reach the leading propulsion device to an intermediate vertical shaft, further passed through the inside of the protective tube to continue to promote tube, and, respectively, wherein, respectively a. This is a so-called penetration method.

According to a fifth aspect of the present invention, there is provided an intermediate shaft preceding type pipe propulsion method according to the fourth aspect, wherein a pit inner end face of a pipe end is sealed immediately after mirror cutting of the liner, and a quick-curing filler is provided. Is filled in the pipe end, and the sealing is released after the filling material has hardened. According to a sixth aspect of the present invention, in the middle shaft leading type pipe propulsion method according to the fourth aspect, the filling of the filler into the inside of the protection pipe is performed by first filling the lower half of the protection pipe with a quick-hardening filler. After filling, the remaining space of the protective tube is densely filled with a normally hardening filler.

According to a seventh aspect of the present invention, in the pipe propulsion method according to the fourth aspect of the present invention, the filling of the filler into the inside of the protective tube is performed by filling the lower half of the protective tube with a normally hardened filler. Material is filled, and then the remaining space of the protective tube is also densely filled with a normally hardened filler.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An intermediate shaft leading type pipe propulsion method according to the first aspect of the present invention is based on the cooperation between a main pushing device and a tip propulsion device installed in a starting shaft (not shown). In a pipe propulsion method for propelling a pipe toward an arrival shaft, a so-called wellhead method is suitably implemented.
The ground behind the reaction wall of the starting shaft not shown is
In some cases, the chemical solution reinforcement injection is performed so that the ground does not behave by the propulsive force of the distal end propulsion device 2 and the pipe. This also has the purpose of ensuring the accuracy of in-pipe surveying.

FIGS. 1 to 6 show the essential process charts.
The first condition is that an intermediate shaft 3 through which the pipe 1 passes is constructed before the arrival of the tip propulsion device 2 at an intermediate position between the starting shaft and the reaching shaft, not shown. The construction of the intermediate shaft 3 includes a lining plan and a suspension protection plan for existing pipes so that members such as protection pipes can be carried into the shaft at the stage of the preliminary design. In the construction, the ground improvement is first performed on the excavated ground by injection of chemicals. At this time, a chemical solution supplement injection is performed especially for reaching the tip propulsion device 2 and near the starting wellhead for reinforcing the ground.
Thereafter, by a well-known excavation method, the ground is excavated to a required depth (for example, about 8.5 m underground) by the method of digging the ground while constructing the liner plate 4 of the mountain retaining. The diameter of the intermediate shaft 3 adopting the wellhead method this time is about 4.5 m in consideration of the final manhole finish.
The bottom concrete 5 is cast on the bottom of the excavation. In addition, in order to fill the gap dug in the outer peripheral ground of the liner plate 4, backfilling is sequentially performed after the liner plate is installed.

The tip propulsion device 2 that has started and advanced the propulsion from the starting shaft, reaches the liner 4 of the intermediate shaft 3 after the construction of the intermediate shaft 3 is completed as described above.
Here, that the tip propulsion device 2 reaches the liner 4 of the intermediate shaft 3 means a state where the tip of the tip propulsion device 2 is pressed against the liner 4 and swells slightly to the inside of the pit. At this stage, from the inside of the intermediate shaft 3, the liner 4 of the portion protruded by the tip of the tip propulsion device 2 is cut out to a range necessary for the checking operation, and the propulsion position of the tip propulsion device 2 is visually confirmed. Conduct survey of the shaft in the shaft.
Then, the reaching wellhead 6 and the starting wellhead 7 are installed in the intermediate shaft 3 at the positions determined based on the above-described survey results, and the reinforcing concrete 8 is cast and firmly fixed.

The detailed structures of the reaching wellhead 6, the starting wellhead 7, and the reinforced concrete 8 are as shown in FIGS. The reaching wellhead 6 and the starting wellhead 7 are both steel plate assemblies, and have a diameter (for example, a pipe outer diameter of 235) through which the tip propulsion device 2 can pass along the line through which the tip propulsion device 2 passes.
Cylindrical body 6 with a gap of about 100 mm for 0 mm)
The outer end of a or 7a is closely joined to the liner plate 4 by welding. A ring-shaped flange 6b or 7b is attached to the inner end of the cylindrical body 6a or 7a at a right angle outward,
Reinforced concrete 8 is cast at the corner surrounded by the outer periphery of the cylindrical body, the flange, and the liner plate 4, so that the mounting state of each wellhead can withstand the passage of the heavy-weight tip propulsion device 2 and pipe 1. It has been. However, if there is any concern about the bearing capacity of the wellhead and protection pipe, reinforced concrete may be poured into the lower half of the protection pipe.

A doughnut-shaped rubber entrance packing 9 is attached to the flange 6b of the arrival well 6 as a means for preventing outflow of earth and sand and groundwater as much as possible when passing through the tip propulsion device 2 and the pipe 1. The entrance packing 9 is of a donut shape having an inner diameter slightly smaller than the outer diameter of the pipe 1 (in the embodiment, smaller by about 200 mm in radius), and is located on the inner surface side of the packing 9 as shown in FIG. Further, as shown in FIG. 9, a position close to the outer diameter is fixed by bolts 11 together with a plurality of flat plate-shaped packing holders 10 arranged in the radial direction. Further, a wire 12 is passed through a pipe 10a provided at a position close to the inner diameter of each packing retainer 10 and arranged in a circular shape. Therefore, when the tip propulsion device 2 and the pipe 1 pass through the arrival well 6,
The entrance packing 9 is deformed together with the packing retainer 10 so as to protrude toward the inside of the downhole in a tapered trumpet shape as shown by a dotted line in FIG. At this time, by closing the wire 12, a sealing pressure sufficient to prevent the outflow of earth and sand and groundwater is applied to the entrance packing 9.

Also, a donut-shaped rubber entrance is provided on the inner surface of the flange 7b of the starting wellhead 7 as a means for preventing outflow of earth and sand and groundwater as much as possible through the tip propulsion device 2 and the pipe 1. Attach packing 9. The entrance packing 9 also has a donut shape having an inner diameter slightly smaller than the outer diameter of the tube body 1, and is arranged in a large number on the inner surface side of the packing 9 as shown in FIG. 10 and in the radial direction as shown in FIG. Flat plate-shaped packing retainer 13
At the same time, the position closer to the outer diameter is fixed by the bolt 11.

Therefore, the starting wellhead 7 is connected to the tip propulsion device 2.
When the pipe 1 passes, the entrance packing 9 is pulled into the wellbore together with the packing retainer 13 as shown by a dotted line in FIG. Behind that, the packing retainer 13 supports the earth and sand,
Entrance packing 9 creates a sealing pressure sufficient to prevent groundwater outflow.

After the preparation of the wellhead as described above, the gantry 14 is installed on the bottom of the intermediate shaft 3, that is, on the bottom concrete 5, and the reaching wellhead 6 and the starting wellhead 7 are communicated thereon. Attach the lower half 15 of the protective tube in half. The details are performed as shown in FIG. 10 by a dotted line showing how the upper half 16 is attached, and FIG. 12 shows the relationship between the lower half 15 and the upper half 16. That is, the lower half 15 and the wellhead
A cap nut 17 for attaching a protective tube is concentrically disposed on the inner surface side of the flange 6b or 7b of the wellhead, and the flange 6b
b, 7b abut the flange of the lower half 15 of the protection tube,
Both bolt the flanges together. At this time, in order to facilitate the work of bolting the bottom of the lower half portion 15, a working port is appropriately prepared in advance in the lower half portion 15 in advance. When the attachment of the lower half 15 is completed, the work opening and the gap are covered by welding a rolled iron plate or the like so that the filler does not leak.

Next, mirror cutting is performed to provide an opening having a diameter through which the tip propulsion device 2 can pass through the liner 4 along the inner periphery of the arrival well 6. For the mirror cutting, a method of fusing the liner 4 is preferably performed. In this case, since the ground around the outer periphery of the liner plate 4 is previously subjected to ground improvement as previously described, the collapse of the mirror and the collapse of the ground are temporarily prevented. However, in order to prevent an unexpected collapse accident, a protective wall 18 is provided in advance on the inner periphery of the lower half portion 15, and in the worst case, the collapse of the ground is stabilized at a repose angle of about 45 °. Aim. And immediately after the mirror cutting, FIG.
As described above, the tip propulsion device 2 is propelled and made to enter the reaching wellhead 6 to close the wellhead, thereby preventing inflow of earth and sand and groundwater as much as possible. Thereafter, the protective wall 18 is removed. Therefore, the protection wall 18 is bolted to facilitate removal.

Next, mirror cutting is performed along the inner periphery of the starting shaft 7 so that the liner 4 has an opening through which the tip propulsion device 2 passes. Thereafter, the tip propulsion device 2 is promptly advanced into the starting shaft 7 and further advanced to a state of protruding out of the intermediate shaft 3 (liner plate 4) as shown in FIG. 5, thereby closing the opening of the starting shaft 7, Prevent inflow of groundwater as much as possible.

After that, as shown in FIGS. 5 and 6, the upper half 16 is placed on the lower half 15 of the protective tube, and the two wellheads are bolted with cap nuts. Upper half 16
Completes the protective tube by bolting the flanges together. In this way, the present method once exposes the tip propulsion device 2 to the intermediate shaft 3, so that if a trouble or accident occurs during construction, it is possible to take immediate measures to ensure safety,
It is a sure way.

In the protective tube completed in the above process, in order to prevent leakage of the filler, the gap is sealed from the outside with a waterproof mortar or the like, and then the filler is injected tightly to prevent the filler from leaking. Is maintained in the same condition as the ground. The filler used is, for example, one having a normal hardening rate obtained by mixing cement and bentonite with water. In some cases, a fast-curing filler obtained by mixing water glass and cement is used. Thereafter, the propulsion of the tube 1 is restarted and continued.

According to the present construction method, troubles such as collapse of the ground, collapsing accidents, and damage to surrounding houses related to the intermediate shaft 3 were carried out without any trouble, and the intermediate shaft was successfully constructed before pipe propulsion. And the significance in the process was also great. Next, the intermediate shaft leading type pipe propulsion method according to the invention described in claim 3 also promotes the pipe body toward the arrival shaft by the cooperative action of the main pushing device and the tip propulsion device also installed in the starting shaft. In the pipe propulsion method, it is suitably implemented as a so-called penetration method. Of course, it is a condition that the intermediate shaft 3 through which the pipe is passed is completely constructed before the arrival of the tip propulsion device 2 at an intermediate position between the starting shaft and the reaching shaft, but in the case of this construction method, the tip propulsion is required. It is a feature that the construction of the intermediate shaft 3 and the installation of the protection pipe are completed before the device 2 is reached. Therefore, as in the above-described large embodiment, the intermediate shaft 3
There is no waste of time as compared with a method in which the front-end propulsion device 2 is made to reach the standby state until the preparation is completed. In the case of this construction method, the following preparation is performed before the tip propulsion device 2 arrives.

The essential steps for implementing this method are shown in FIGS. The diameter of the intermediate shaft 3 adopting the penetration method this time is about 3.7 m in consideration of the final manhole finish. When the intermediate shaft 3 is completed, the middle shaft is surveyed on the basis of the planned passage position of the tip propulsion device 2 which is controlled and directionally controlled while surveying, and the bottom of the intermediate shaft is measured based on the survey result. That is, the gantry 14 is installed on the bottom concrete 5, and the lower half 20a of the protection tube and both ends 20b of the protection tube are attached thereon (FIG. 13, FIG. 13).
(FIG. 14). That is, since the protection pipe is prepared in advance based on the expected passing position of the tip propulsion device 2 to be propelled, it is assumed that the propulsion control of the tip propulsion device 2 is highly accurate and highly reliable. It is required that the technology of surveying and direction control is established.

Thereafter, the tube ends 2 of the arrival side and the start side, respectively.
Along the inner periphery of Ob, the liner 4 is mirror-cut to provide an opening through which the tip propulsion device 2 passes. For the mirror cutting, a method of fusing the liner 4 is preferably performed.
The liner end piece is preferably blown so as to leave a little (about 30 mm in the embodiment) from the joint between the pipe end 20b and the liner 4. Also in the case of this method, the ground around the outer periphery of the liner plate 4 has been improved in advance at the beginning, and supplementary injection has been performed at the reaching and starting portions. Since the tip propulsion device 2 has not yet reached the ground, There is also an advantage that the mountain is not disturbed, and the collapse of the mirror and the collapse of the ground are temporarily prevented.
However, to prevent accidental collapse, the pipe end 20b
A protective wall is provided in advance in the lower half of the inner surface of the mine, and in the worst case, collapse of the ground is suppressed by the protective wall.
It is also good to stabilize at an angle of repose of about °.
When the mirror cutting is completed, the inner surface of the pipe end 20b is immediately sealed with a protective wall, and a quick-hardening filler is filled in the pipe end 20b, and the collapse of ground and groundwater. Prevent spills as much as possible. After the filler has hardened sufficiently, the protective wall is removed and the seal is broken. As the quick-setting filler, a water-glass and cement-based filler which hardens instantaneously is preferably used.

Thereafter, the upper half of the protection tube is attached to complete the assembly of the protection tube 20. The details of the structure of the protection tube 20 are as shown in FIG. The protection tube 20 is designed and manufactured to have a strength to withstand the weight of the tip propulsion device 2 and the tube 1 when passing through the tube. In the protective tube completed in the above process, in order to prevent the leakage of the filler, the gap is sealed from inside and outside of the protective tube with a waterproof mortar or the like, and then the filler is injected tightly (FIG. 1).
5). Here, as a method for injecting the filler, first, a range of the lower half portion 20a of the protective tube is filled with a quick-hardening filler to prevent leakage of the filler from a welded portion between the protective tube and both ends. Subsequently, the remaining space (upper half) of the protective tube is densely filled with a normally hardening filler (for example, the cement or bentonite filler described above). As a result, the inside of the protection pipe 20 is in the same condition as the ground, and accidents such as collapse of the ground and outflow of groundwater are prevented beforehand. Further, in order to prevent an unexpected accident from occurring, reinforced concrete 8 is cast on the outer periphery of the pipe end 20b as shown in FIG. Like reinforced concrete 2
It is also preferable to improve the yield strength of the protective tube by casting 1.

After all of the above preparations are completed, the tip propulsion device is allowed to reach the intermediate shaft, and without stopping, is passed through the protective pipe 20 as shown in FIG. Propulsion to the shaft will be continued. Even with this method, troubles such as collapse of the ground, collapsing accidents, and damage to surrounding houses related to the intermediate shaft 3 were carried out without any problems, and preparation for installation of the protective pipe was completed before the tip propulsion device arrived. The construction period was shortened compared to the wellhead method. With these two methods, the wellhead method and the penetrating method, the construction period is shortened by about one month (three months is about two months), compared to the case where the 350 m pipe is propelled and two intermediate shafts are constructed by the conventional method. Was able to do.

The present invention can be applied or applied to the following. The invention can be applied not only to an intermediate shaft but also to a starting shaft and a reaching shaft. Since the mirror cut portion may be not only the liner plate but also a steel sheet pile or the like, a mountain retaining of an intermediate shaft or the like can be performed by a steel sheet pile method. It can be applied not only to propulsion work but also to shield work. On the arrival side, a wellhead with entrance packing of the wellhead type is installed, and on the starting side, a mixed type in which one end of a protective tube of the penetration type can be substituted. The protective tube need not necessarily be cylindrical.

[0030]

[Effects of the present invention] According to the present invention, a pipe propulsion method in which an intermediate shaft is provided in advance is provided. By solving the problem, it is possible to achieve excellent effects such as ease of construction, high efficiency, safety that never causes a collapse accident, etc., and a great shortening of the construction period.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first step of a wellhead type pipe propulsion method of the present invention.

FIG. 2 is a sectional view showing the next step of the pipe propulsion method.

FIG. 3 is a cross-sectional view showing steps of a pipe propulsion method.

FIG. 4 is a cross-sectional view showing steps of a pipe propulsion method.

FIG. 5 is a cross-sectional view showing steps of a pipe propulsion method.

FIG. 6 is a cross-sectional view showing steps of a pipe propulsion method.

FIG. 7 is a plan view showing an installation state of a protection tube.

FIG. 8 is a cross-sectional view showing a part of an entrance packing at a reaching wellhead.

FIG. 9 is a front view showing a part of an entrance packing at a reaching wellhead.

FIG. 10 is a sectional view showing a portion of an entrance packing at a starting wellhead.

FIG. 11 is a front view showing a part of an entrance packing at a reaching wellhead.

FIG. 12 is a front view showing an assembling mode of the protection tube.

FIG. 13 is a cross-sectional view showing a first step of the penetration type pipe propulsion method of the present invention.

FIG. 14 is a sectional view showing the next step of the pipe propulsion method.

FIG. 15 is a sectional view showing a step of the pipe propulsion method.

FIG. 16 is a sectional view showing a step of the pipe propulsion method.

FIG. 17 is a sectional view showing a step of the pipe propulsion method.

FIG. 18 is a plan view showing an installation state of a protection tube.

19 is a view taken in the direction of arrows 19-19 in FIG. 17;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pipe 2 tip propulsion device 3 middle shaft 4 liner 5 bottom concrete 6 reaching shaft 7 start shaft 14 gantry 15 lower half of protection pipe 16 upper half of protection pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mikio Hayashi 3-1-1, Sannomaru, Naka-ku, Nagoya City, Aichi Prefecture Inside the Nagoya City Sewerage Bureau (72) Inventor Hiroshi Hashiba 1-18-22 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture No. Takenaka Civil Engineering Nagoya Branch Co., Ltd. (72) Inventor Shunzo Sugimoto 1-18-22 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Co., Ltd. Within Takenaka Civil Engineering Nagoya Branch (72) Inventor Tsuguo Yamamoto Naka, Aichi Prefecture 1-18-18 Nishiki, Ward Nagoya Branch of Takenaka Civil Engineering Co., Ltd. (72) Inventor Yukio Ishizuka 1-18-22 Nishiki, Naka Ward, Nagoya City, Aichi Prefecture Nagoya Branch of Takenaka Civil Engineering Co., Ltd. (72) Inventor Kojima Hiroshi 1-18-18 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Inside the Takenaka Civil Engineering Nagoya Branch (72) Inventor Minoru Fujimori 1-18-22 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Stock Company Takenakadoboku Nagoya within the Branch (72) inventor Katsuya Nozawa Niigata, Niigata Prefecture Ichibanboridori-cho, the third address 10 stock companies within the Fukudagumi

Claims (7)

[Claims] 1. A pipe propulsion method for propelling a pipe toward an arrival shaft by a cooperative action of a main pushing device and a tip propulsion device installed in a start shaft, wherein a pipe body is provided at an intermediate position between the start shaft and the arrival shaft. To build an intermediate shaft before passing the tip propulsion device, and at the stage when the tip propulsion device reaches the liner of the intermediate shaft,
Check the position of the tip propulsion device and measure the baseline of the shaft, based on the results of the survey, install the arrival well and the start well in the middle shaft, install a gantry at the bottom of the middle shaft, Attaching the lower half of the protective tube that communicates the arrival wellhead and the starting wellhead, performs mirror cutting to provide an opening for passing the tip propulsion device to the liner along the inner circumference of the arrival wellhead, Advancing into the middle shaft, making a mirror cut in the liner along the inner periphery of the starting shaft to provide an opening for passing the tip propulsion device, and moving the tip propulsion device out of the middle shaft, under the protective tube A middle shaft leading type pipe, which is characterized by mounting the upper half on the half, injecting the filling material into the sealed protective tube, and then continuing the propulsion of the tube body Propulsion method. 2. Reinforced concrete is poured into the arrival wellhead and the start wellhead, and entrance packing is attached to each wellhead before the tip propulsion device passes through the arrival wellhead and before it advances to the start wellhead. 2. The method according to claim 1, wherein the passage is passed through a tip propulsion device, sealed with a protective tube, and filled with a fast-curing or normally hardening filler. . 3. An entrance packing is attached to each of the entrance wellhead and the starting wellhead before the tip propulsion device passes through the arrival wellhead and before the forward propulsion device is advanced to the starting wellhead. 2. The method according to claim 1, wherein the space is sealed with a protective tube and the gap is filled with a fast-curing or normally hardening filler. 4. A pipe propulsion method in which a pipe body is propelled toward an arrival shaft by the cooperation of a main pushing device and a tip propulsion device installed in a starting shaft, wherein a pipe body is provided at an intermediate position between the starting shaft and the arrival shaft. Constructing an intermediate shaft before the arrival of the tip propulsion device, and making the following preparations, perform surveying of the middle shaft base line based on the scheduled passage position of the tip propulsion device, and based on the above survey results Install a gantry at the bottom of the middle shaft, attach the lower half of the protection tube and both ends of the tube on it, and let the liner pass the tip propulsion device along the inner circumference of the arrival and start ends of the tube Make a mirror cut with an opening, attach the upper half of the protective tube, and inject the filler into the sealed protective tube, and after completing the above preparations, make the tip propulsion device reach the middle shaft. , And a protective tube It is passed through a medium by continuing the promotion of the tubular body, and, respectively, characterized, respectively, and tubing jacking method of intermediate shafts preceding type. 5. Immediately after mirror-cutting of the liner, sealing the inner end surface of the tube end, filling the tube end with a quick-hardening filler material, and releasing the seal after the filler material has hardened. The middle shaft precedent type pipe propulsion method according to claim 4, characterized in that: 6. Injecting the filler into the inside of the protective tube is performed by first filling the lower half of the protective tube with a quick-hardening filler, and then filling the remaining space of the protective tube with the normally hardened filler. The method according to claim 4, wherein the pipe is propelled in an intermediate shaft. 7. Injection of the filler into the inside of the protective tube is performed by filling the lower half of the protective tube with the normally hardened filler, and then filling the remaining space of the protective tube with the normally hardened filler. The method according to claim 4, wherein the pipe is propelled in an intermediate shaft.