JPH055035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for connecting objects to be connected, such as branch pipes, air valves, various valves, etc., to a ductile pipe for propulsion construction.

BACKGROUND TECHNOLOGY It is preferable that the outer circumferential surfaces of ductile pipes used in the propulsion method are flush with each other in order to facilitate propulsion. Therefore, as a ductile pipe, as shown in FIG.
has traditionally been used. During propulsion, the end face of the leading pipe on the rear end socket side is abutted against the flange 53 provided on the leading end socket side of the trailing pipe of the ductile pipe 50, thereby transmitting thrust.

Problems to be Solved by the Invention By the way, in the ductile pipe 50 that is propelled as described above and piped in a certain section as shown in FIG. For example, when it becomes necessary to connect a branch pipe 60, the vertical shafts A and C are connected to points B and C.
Work shafts B and C of the same scale as D will be excavated, and work will be carried out within these shafts B and C, such as providing a branch opening at the corresponding location where the branch pipe 60 will be connected in the ductile pipe 50. .

However, since the conventional ductile pipe 50 is covered with reinforced concrete 52 as described above, the concrete 52 must be dismantled and removed before work, which makes the work complicated and difficult. Since this takes time, the construction period becomes longer and the construction cost increases, and the pipe body 51 is often damaged during the dismantling work. Therefore, with the ductile pipe 50 covered with reinforced concrete 52 as described above, once the piping is completed, it is virtually impossible to connect the branch pipe 60.

On the other hand, if the relevant connection point of the branch pipe 60 is known before piping, the vertical shafts A, B, C, D
Ductile pipe 50 as a starting shaft or reaching shaft
This is possible by installing a propulsion piping and connecting branch pipes 60 through appropriate connecting pipes at shafts B and C during this piping. However, in this case, it was necessary to keep the large shafts B and C excavated until the piping work was completed, and in any case, there were problems such as the construction period becoming longer and causing problems with traffic, etc. .

Therefore, this invention is useful not only when the connection points of branch pipes etc. are known before piping, but also after piping, in ductile pipes covered with reinforced concrete, without dismantling the concrete. The technical problem is to make it possible to economically connect objects to be connected such as branch pipes.

Means for Solving the Problems In order to solve the above technical problems, the present invention is characterized by adopting the following technical means. In other words, between the leading pipe and the trailing pipe of a plurality of ductile pipes each having a steel pipe body covered with reinforced concrete, the outer circumferential surface is formed almost flush with the outer peripheral face of the ductile pipe, and the leading pipe and the trailing pipe are After connecting a separable spacer with its tip end to the leading pipe and its trailing end to the trailing pipe and placing it at the connection point of the connected object, the spacer is separated from the leading pipe and the trailing pipe. The method is to separate and remove the spacer from the relevant connection point, place a connecting tube in the spacer's trace, and connect the leading tube, trailing tube, and connected object via this connecting tube.

Therefore, according to the present invention, it is possible to quickly connect the object to be connected to the ductile pipe,
Even in the case of ductile pipes installed using the conventional propulsion method, objects to be connected can be connected without dismantling the exterior concrete.

Effects of the Invention As described above, in the connection method of the present invention, a separable spacer is joined between the leading pipe and the trailing pipe of the ductile pipe. By placing a connecting pipe in the trace, it is possible to quickly and economically connect a ductile pipe with a reinforced concrete exterior without dismantling the exterior concrete. This can be done before or after piping.
In addition, when installing a shaft for connection, it only needs to be within a limited range with a spacer, so there is no need to install a large-scale shaft such as a starting shaft or a destination shaft, and a small-scale working shaft is sufficient. be. moreover,
The spacer to be separated and removed from the ductile pipe,
For example, it can be made decomposable and reused, which is economical. Furthermore, since this invention connects ductile pipes through separable spacers, even when it is necessary to connect connected objects within the piping section, long-distance piping can be carried out within the limits of the propulsion capacity of the starting shaft. It is possible to eliminate or reduce the number of divisions in the propulsion section compared to the conventional method, and furthermore, the subsequent connection work is easy, so it has excellent effects such as reducing construction costs and construction period.

Embodiment In Figs. 1 to 3, 1 is a cylindrical spacer made of iron, and this spacer 1 transmits thrust between the leading pipe and the trailing pipe of a plurality of ductile pipes 10 made of a steel pipe body 11 covered with reinforced concrete 12. The ductile pipe 10 is disposed such that both ends of the ductile pipe 10 abut against the flange 13 of the ductile pipe 10. The outer circumferential surface of the spacer 1 is formed flush with the outer circumferential surface of the ductile pipe 10, and the inner diameter of the spacer 1 is formed to be slightly larger than the outer diameter of the insertion port 15 of the ductile pipe 10.

When the spacer 1 is joined with both ends abutting against the flange 13 of the ductile pipe 10 as described above, it will be in a state where it is inserted into the socket 15, but when it is separated in this state, the ductile pipe 10 is It is divided into two parts so that it can be separated from the leading pipe and the trailing pipe. In other words, spacer 1 is half-split 2
The two pipe parts 2 and 3 have their opposing end surfaces abutted against each other, and a tightening member such as a bolt nut 6 is provided between the mounting holes 4 and 5 formed with a notch on the outer periphery of the end. It is designed to be assembled by tightening and fixing.

Therefore, when propelling the ductile pipe 10 connected to the spacer 1 as described above, the ductile pipe 10 is moved from the flange 13 of the trailing pipe of the ductile pipe 10 to one end of the spacer 1, and further from the other end of the spacer 1. The thrust is transmitted to the flange 13 of the leading pipe.

Next, a description will be given of the operation of connecting, for example, a branch pipe 20 as a connected body to the ductile pipe 10 arranged as shown in FIG. 1 by connecting the spacer 1.

First, the spacer 1 closest to the branch pipe 20
The location will be determined through pipe map surveys, magnetic detection, test drilling, etc. After determining this, the area around where the spacer 1 is located is excavated by providing working shafts B' and C' which are smaller than the starting shaft A and the arrival shaft B. After drilling, remove the bolt nut 6 and attach the spacer 1 to the two pipe parts 2 and 3.
It is separated into two parts and removed to the outside from working shafts B' and C'.

Next, as shown in FIG.
2, and between one end of this T-shaped tube 22 and the leading pipe inlet 15 of the ductile pipe 10, and the other end of the T-shaped pipe 22 and the trailing pipe inlet 15 of the same, a joint ring is provided. 23, a sealing rubber ring 24 is interposed between the inner circumferential surface of both ends of each joint ring 23, the outer circumferential surface of the end of the T-shaped tube 22, and the outer circumferential surface of the insertion port 15, and a push ring 25 is inserted. Tighten and fix.

Thereafter, the branch pipe 20 is connected to a branch opening (not shown) formed in the T-shaped pipe 22. After connecting,
Work shaft B', C', starting shaft A, arrival shaft D
This completes the work, and the branch pipe 20 is now connected to the ductile pipe 10.
In addition, the starting shaft A and the reaching shaft D are ductile pipes 10.
After completing the piping, it may be backfilled before starting the work to connect the branch pipes.

FIG. 5 shows an example in which, in place of the T-shaped tube 22, another T-shaped tube 27 having sockets 28 formed at both ends is arranged. As shown in the connection process, one socket 28 of the T-shaped pipe 27 is connected to the leading pipe socket 15 of the ductile pipe 10.
After inserting it into the body, by pushing the trailing tube
The insertion port 15 is inserted into the other socket 28 of the T-shaped tube 27 for connection. In this case as well, although not shown, a sealing rubber ring is interposed between the inner circumferential surface of the socket 28 of the T-shaped tube 27 and the outer circumferential surface of the insertion port 15 of the leading and trailing tubes. Tighten and secure with a ring.

In the above, if the position of the branch pipe 20 is known before the propulsion piping of the ductile pipe 10,
Adjust the length of the ductile pipe 10 from the starting shaft A during propulsion using a ductile pipe of an appropriate length,
The spacer 1 may be located at the connection location of the branch pipe 20.

In the above embodiment, the branch pipe 20 was used as an example of the connected object, so the T-shaped pipe 22,
Although 27 is mentioned above, if another air valve is to be connected, the valve installation pipe can be used as the connecting pipe instead of the T-shaped pipes 22 and 27. Furthermore, the structure of the spacer 1 is merely an example; a different design may be used as long as it can be separated from the ductile pipe. The number used can be changed as appropriate.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an embodiment of the present invention, Fig. 2 is an enlarged front view of the main part with the upper half cut away, showing a ductile pipe to which the above spacer is connected, and Fig. 3 is the same as Fig. 2. Vertical side view along the - line, No. 4
The figure is an enlarged sectional view of the main part showing an example of installing the connecting pipe in the same as above, Figures 5A, B, and C are enlarged sectional views of the main part showing another example of installing the connecting pipe in the same as above, and Figure 6 is the conventional example. FIG. 7 is an enlarged sectional view of the main part showing the ductile pipe portion, and is a schematic plan view corresponding to FIG. 1 in the conventional example. 1... Spacer, 2, 3... Pipe section, 4, 5...
Mounting hole, 6...Bolt nut, 10...Ductile pipe, 11...Iron pipe body, 12...Reinforced concrete, 13...Flange, 15...Socket, 20
... Branch pipe, 22, 27 ... T-shaped pipe, 23 ... Connection ring, A ... Starting shaft, D ... Arrival shaft, B',
C′...Working shaft.

Claims (1)

[Claims] 1. Between the leading pipe and the trailing pipe of a plurality of ductile pipes having a steel pipe body covered with reinforced concrete, the outer peripheral surface is formed almost flush with the outer peripheral face of the ductile pipe, and the outer peripheral surface is formed almost flush with the outer peripheral surface of the ductile pipe, and After joining a spacer that can be separated by using the following steps, its tip is connected to the leading pipe and its rear end is connected to the trailing pipe, and the spacer is placed at the connection point of the connected object, and then the spacer is separated from the leading pipe and the trailing pipe. A ductile for a propulsion construction method, characterized in that the ductile is removed from the relevant connection point, a connecting pipe is placed in the place where the spacer remains, and the leading pipe, trailing pipe, and connected object are connected via this connecting pipe. A method of connecting objects to pipes.