JPS62258098A - Method of main-pipe pull-in execution method and leading-pipe connector used for said method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a main pipe lead-in construction method for burying telephone line main pipes, etc. underground by a trenchless construction method, and a lead pipe connection used in this method. Regarding equipment.

[Conventional technology]

Conventionally, it has been difficult to propagate telephone pipes over long distances due to issues such as the accuracy of the lead pipe propulsion.

For this reason, a vertical shaft was installed in the middle, the left end shaft, the middle shaft,
The intermediate shaft and the right-end shaft are each divided into two processes. First, the lead pipe is propelled from the middle shaft to the left-hand end shaft, and then the main pipe (usually 2 to 4 lines are dammed) is installed at the rear of the lead pipe. A towing machine will be used to pull the lead pipe and pull the main pipe into the intermediate shaft. Similarly, the main pipe on the other side will be pulled into the intermediate shaft. Next, the two main pipes that have been pulled in cannot be connected in the intermediate shaft (the main pipe rolls during pulling, resulting in vertical and horizontal deviations in both main pipes), so conventionally it was unavoidable to connect the two main pipes in Figure 3 (-), Both main pipes were connected using the connection method shown in (b).

That is, in the same figure (-), a manhole 2 is constructed in the intermediate shaft 1, and both main pipes 3 and 4 propelled within this manhole 2 are connected.

On the other hand, in Fig. 3(b), the intermediate shaft 1 is formed long so that both the main pipes 3 and 4 can be connected within the intermediate shaft 1, and the normal shaft dimension ZOm is approximately 20 m wide. 4 After bending both sides (aligning the tube axes), a side joint is made up of vertically split semi-cylindrical tubes 5A and 5B and a bolt 6 that integrally connects these semi-cylindrical tubes 5A and 5B. The connection is made using T or the like.

In addition, in the figure, 8 is the right end shaft, and 9 is the left end shaft.

[Problem that the invention seeks to solve]

However, the former method has problems such as high costs associated with constructing the manhole 2, and constructing the manhole 2 in a short section is undesirable from the viewpoint of road occupancy restrictions and maintenance. On the other hand, the latter method has an error of 3.4 in the main pipe due to propulsion accuracy (vertical and horizontal deviations of both main pipes)
This caused a problem in that the pipe axes of the main pipes 3 and 4 to be connected did not match, making it difficult to connect using side joints T or the like. Therefore, in order to facilitate the connection work using side joints T, etc., a method has been used in which the dimensions of the intermediate shaft 1 are lengthened and the pipes are bent within the shaft. Connection is difficult. In addition, the connection method using such side joints 1 and the like has the disadvantage that the 1st strength joint part, which cannot maintain the airtightness of the connected pipes, is a weak point and becomes a cause of pipe breakage later on.

Therefore, all of these conventional connection methods are considered unsuitable for connecting main pipes over long distances.

[Means for solving problems]

The main pipe lead-in construction method according to the present invention was made to solve the above-mentioned problems, and includes the steps of sequentially connecting and advancing the first leading pipe from the intermediate shaft toward the first shaft;
Connecting a main pipe to the tip of the first leading pipe that has reached the first shaft, and connecting the main pipe sequentially while towing it toward the intermediate shaft, and drawing the main pipe to the intermediate shaft; Connect the second lead pipe sequentially from the intermediate shaft to the second shaft,
a step of connecting the first and rlc2 leading pipes in the intermediate shaft with a bendable leading pipe connecting device; and pulling the second and first leading pipes toward the second shaft. At the same time, the main pipe in the first shaft was
The method includes a step of sequentially connecting to the main pipe connected to the leading pipe and drawing the main pipe to the second shaft.

Further, the leading pipe connecting device used in the construction method according to the present invention includes a pair of outer cylindrical pipes connected to mutually opposing ends of the first and second leading pipes, and a pair of outer cylindrical pipes connected to each of these outer cylindrical pipes. It is composed of a pair of connected inner cylindrical tubes, and a connecting means that connects both inner cylindrical tubes by being inserted into these inner cylindrical tubes so as to be swingable and prevented from coming off.

[Effect]

In the construction method according to the present invention, the first and second leading pipes are propelled from the intermediate shaft toward the first and second shafts, respectively, and these leading pipes are connected within the intermediate shaft. Pipe axis alignment is easy and there is no need to construct manholes.

Further, since the leading pipe connecting device used in the method of the present invention is bendable, it absorbs the deviation of the pipe axis during propulsion, and the connection of both leading pipes is easy and reliable.

〔Example〕

The present invention will be explained in detail below based on the drawings.

FIG. 1 is a diagram for explaining the main pipe lead-in construction method according to the present invention. In these figures, 20 is the r:g1 shaft, 21 is the second shaft, and 22 is the first and second shaft 20.
21 is a propulsion machine that pulls and propels the leading pipe.

Next, the procedure of the nine main pipe lead-in construction method will be explained according to the construction steps ① to ②.

(1) First, it is propelled from the intermediate shaft 22 toward the first shaft 20 while sequentially connecting the first leading pipes 25 (step (■)). This propulsion is performed by a propulsion device 23.

(2) When the tip of the first leading pipe 25 reaches the first shaft 20, the first main pipe 27A is connected to this tip using an appropriate connecting means, and this is used to operate the propulsion machine 23 in the opposite direction. By doing so, it is towed toward the intermediate shaft 22, and then the second, third, etc. main pipe 2γI! , 2γC... and pull the main pipe 2γ to the intermediate shaft 22 (step ■). At this time, the first leading pipes 25 drawn into the intermediate shaft 22 are sequentially removed, leaving only the first leading pipe.

0) Next, as in (1) above, the second leading pipe 28 is sequentially connected and the propulsion device 23 propels the shaft from the intermediate shaft 22 to the second shaft 21 (step (■)).

(4) When the tip of the second leading pipe reaches the second shaft 21, take out the propulsion device 23 from the intermediate shaft 22,
The mutually opposing ends of the first and second leading pipes 25 and 28 are connected by a bendable leading pipe connecting device 30, which will be described later (step 2).

6) Next, the propulsion device 23 is installed in the second shaft 21, and the second and first guide pipes 28.25 connected by the guide pipe connecting device 30 are connected to the second shaft 21 using the propulsion device 23. Tow it towards (■ process). At this time, new main pipes are sequentially connected to the previously connected main pipes 2T in the first shaft 20. Then, when the fourth shaft 20° intermediate shaft 22 and the second shaft 21 are connected in series by the main pipe 21, the drawing construction of the main pipe 2γ is completed.

Incidentally, when the second and first leading pipes 28, 25 and the leading pipe connecting device 30 are pulled into the second shaft 21, they are sequentially removed and the nine main pipes 21 are laid underground and buried in stone.

Next, the structure etc. of the lead pipe connecting device 30 will be described in detail based on FIG.
．． It is composed of a pair of outer cylindrical tubes 37 and 38, each of which has one end threadedly connected to the outer periphery of the cylindrical tube 38, and a bolt 39 and a nut 40 as connecting means for connecting the pair of inner cylindrical tubes 35 and 36. The other end of each outer cylindrical tube 37, 38 is configured to be threadedly connected to the first and second leading tubes 25, 28, respectively.

Bolt insertion holes 41.42 into which the bolts 39 are inserted are formed in opposing surfaces of each of the inner cylindrical tubes 35.38, and between these insertion holes 41.42 and the bolts 39, An appropriate gap G is provided to allow the bolt 39 to swing.

In addition, an appropriate gap is provided between the inner cylindrical tubes 35 and 36,
Furthermore, the bolt 39 is axially movable to some extent, so that the inner tubes 35, 36 can be tilted relative to the bolt 39, forming a flexible coupling device 30. In addition,
The bottom surface 43 of the head 39A of the bolt 39 is formed into a curved surface to facilitate the swinging of the bolt 39. Also.

The bolt 39 and nut 40 have sufficient rigidity to allow the guide tubes 25, 28 to be pulled back if trouble with traction occurs during propulsion.

First and second leading pipes 25 by leading pipe connecting device 30
．． In the connection operation of 28, first, the two inner cylindrical pipes 35 and 38 are connected by bolts 39 and nuts 40. Also, each outer tube 37, 38 is screwed into the first and second guide tubes 25, 28, respectively. Thereafter, the two inner tubes 35, 36 are sequentially screwed into each of the outer tubes 37, 38, thereby completing the connection of the leading tubes 25, 28.

Note that the leading pipe connecting device 30 is not limited to the structure of the above-described embodiment, and may be connected by other means 9, such as connecting pins, for connecting the inner pipe and the outer pipe, or the outer pipe and the leading pipe, instead of using screws. It is possible to make changes such as connecting by

〔Effect of the invention〕

As explained above, according to the main pipe lead-in construction method according to the present invention, the first and second leading pipes propelled toward the first and second shafts, respectively, from the intermediate shaft are connected within the intermediate shaft. This makes it easy to align the pipe axes, eliminates the need to construct manholes, and has great economic effects. Also.

Since both lead pipes are connected by a flexible lead pipe coupling device, higher propulsion accuracy is not required compared to connections using conventional split pipe joints, etc., and a series of reliable pipe facilities can be used over long distances. It can be built across.

Further, the leading pipe connecting device used in the method of the present invention has a simple structure, can be manufactured easily and inexpensively, and is bendable, so that it absorbs misalignment of the pipe axis.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the method of the present invention, Fig. 2 is a cross-sectional view showing one embodiment of the leading pipe connecting device used in the method of the present invention, and Fig. 3 (GL) and (b) are respectively conventional FIG. 2 is a diagram for explaining a connection method. 20 Yu...first shaft, 21...second shaft, 22...
...Intermediate shaft, 23...Propulsion machine, 25a a m
a M 177) Leading tube, 27.27A, 27B -
--・Main pipe, 28...Second leading pipe, 30...Left pipe connecting device, 35.36--Indoor tube pipe, 37.3
8-Silver 9/Outer tube, 39 holes/Φ/Bolt, 40φφ/-
Nut, 41.42...#l bolt insertion hole.

Claims (2)

[Claims] (1) The step of sequentially connecting and propelling the first leading pipe from the intermediate shaft toward the first shaft, and connecting the main pipe to the tip of the first leading pipe that has reached the first shaft, and a step of sequentially connecting the main pipes together with the first leading pipe while towing it toward the intermediate shaft and drawing the main pipe to the intermediate shaft; and sequentially connecting the second leading pipes from the intermediate shaft toward the second shaft. , a step of connecting the first and second leading pipes in the intermediate shaft with a bendable leading pipe connecting device, and moving the second and first leading pipes toward the second shaft. A main pipe lead-in construction method comprising the steps of sequentially connecting the main pipe to the main pipe connected to the first leading pipe in the first shaft while being towed, and drawing the main pipe to the second shaft. . (2) A pair of outer cylindrical tubes connected to mutually opposing ends of the first and second leading tubes, a pair of inner cylindrical tubes respectively connected to these outer cylindrical tubes, and these inner tubes. A leading pipe connecting device comprising a connecting means for connecting both inner cylindrical pipes by being inserted into the pipe so as to be swingable and prevented from coming off.