JPH0220308Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to pipes for use in propulsion construction methods.

Conventional configuration and its problems When a large diameter pipe with a diameter of 2000 mm or more is laid using the propulsion method, a small diameter pipe such as a sheath pipe for power cables with a diameter of about 100 mm is also laid in the vicinity of this large diameter pipe. is often requested. At this time, if the large-diameter pipe and the small-diameter pipe are laid in separate processes, there is a problem that work efficiency is poor. Therefore, conventionally, for example, in Utility Application No. 59-64937, a large-diameter pipe for the propulsion method, which has a socket and an insertion port, has a similar length to the large-diameter pipe, and a socket and an insertion port. A small diameter pipe having a mouth is fixed parallel to the large diameter pipe and with the end faces of the sockets of both pipes aligned, and is propelled to the outside of the socket of the large diameter pipe to the socket of the large diameter pipe. A device has been proposed that includes a flange for transmitting force and a thrust transmitting member fixed to the flange and capable of transmitting thrust to the socket of the small diameter pipe. According to this, the large-diameter pipe and the small-diameter pipe can be integrated, and thrust can be transmitted to both pipes, so both pipes can be propelled at the same time, allowing efficient work.

However, in the above-mentioned conventional configuration, since the small-diameter pipe is disposed bare outside the large-diameter pipe, there is a problem that it is likely to come off the predetermined position due to the action of earth pressure or the like during propulsion.

Purpose of the invention Therefore, the purpose of the present invention is to prevent the small-diameter pipe from coming out of its predetermined position during propulsion.

Structure of the device In order to achieve the above object, the present device has a socket on one end and an inlet on the other end, and has a length equivalent to that of the large diameter pipe on the outside of the large diameter pipe for the propulsion method. In addition, a small diameter tube having a socket at one end and an inlet at the other end is arranged in parallel with the sockets and inlets of both tubes corresponding to each other, and this small diameter tube is
The small diameter pipe is fixed to the large diameter pipe by a fixing member having a fastener for attaching the small diameter pipe to the large diameter pipe, and a distance piece inserted in the gap between the small diameter pipe and the large diameter pipe. A large-diameter pipe and a small-diameter pipe are integrally covered with exterior concrete.

Therefore, the small diameter pipe is not only firmly fixed to the large diameter pipe by the action of the exterior concrete, but also
Since contact with earth and sand is prevented and there is no earth pressure, the problem of the pipe coming off the designated position during propulsion can be reliably solved.Moreover, small diameter pipes can be easily fixed by fastening members with fasteners and distance pieces. Since it is fixed to the diameter pipe, the distance piece prevents interference between the sockets of both pipes, and after positioning the small diameter pipe in the specified position, the small diameter pipe is securely fixed to the large diameter pipe using the fastener. This makes it easy to cover the exterior with concrete.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In Figures 1 and 2, numeral 1 indicates a large diameter pipe such as a sewer pipe, with a diameter of approximately 2400 to 2600 mm. 2 is a small diameter pipe such as a power cable sheath pipe,
It has a diameter of about 80 mm, has the same length as the large diameter pipe 1, and is arranged parallel to the outside of the large diameter pipe 1.

In the large-diameter pipe 1, 3 is a socket, 4 is an inlet, and a cement mortar lining 5 is formed on the inner surface of the pipe. Reference numeral 6 denotes a sealing material between the sockets and sockets that are joined together, and is compressed by a pressing device 7. A flange 8 is welded to the outer surface of the socket 4 so as to be in contact with the end face of the socket 3 and capable of transmitting propulsive force.
9 is a fixing bolt. Like the large diameter pipe 1, the small diameter pipe 2 also has a socket 10 and an insertion port 11, and the socket 10
is arranged so that its end face is aligned with the end face of the socket 3 of the large diameter pipe 1.

A thrust transmission plate 12 as a thrust transmission member is welded to the flange 8, and this thrust transmission plate 12 includes:
A through hole 13 in the tube axis direction that is smaller than the outer diameter of the socket 10 of the small diameter pipe 2 and larger than the outer diameter of the insertion port 11.
is formed, and thrust can be transmitted to the socket 10 when the socket 11 is inserted into the socket 10.
Ribs 14 and 15 are welded to the thrust transmission plate 12.

As shown in Figures 1 and 3, the outer periphery of the pipe body of the large diameter pipe 1 is reinforced with reinforcing bars (not shown in Figure 3).
It is covered with 6-pack exterior concrete 17.
Further, 18 is a fixing member for fixing the small diameter pipe 2 to the large diameter pipe 1, and by welding both ends to the anchor bolt 19 buried in the exterior concrete 17, the small diameter pipe 2 can be fixed to the large diameter pipe 1. tube 1
It has a band-shaped fastener 20 that can be fixed to the pipe, and a distance piece 21 that is inserted in the gap between the small diameter pipe 2 and the exterior concrete 17.

22 is an exterior concrete covering the small diameter pipe 2. This exterior concrete 22 is fixed and integrated with the exterior concrete 17 of the large diameter pipe 1, and is cast continuously in the tangential direction of the exterior concrete 17.

In such a configuration, when attaching the small diameter pipe 2 to the large diameter pipe 1 with the exterior concrete 17, first align the end face of the socket 10 of the small diameter pipe 2 with the end face of the socket 3 of the large diameter pipe 1, and then The opening 11 is inserted into the through hole 13 of the thrust transmission plate 12, and the small diameter tube 2 is fixed parallel to the large diameter tube 1 using the fixing member 18. Next, as shown in FIG.
When the exterior concrete 17 is applied to the exterior concrete 17 and the exterior concrete 22 is placed inside it, the exterior concrete 22 is fixed to the exterior concrete 17 of the large diameter pipe 1 while covering the small diameter pipe 2 and is integrated. Thereby, the small diameter pipe 2 is firmly fixed to the large diameter pipe 1 via the exterior concrete 22.

When the pipe is propelled, the thrust is transmitted to the large diameter pipe 1 via the flange 8 and to the small diameter pipe 2 via the thrust transmission plate 12, and the large diameter pipe 1 and the small diameter pipe 2 are promoted at the same time. At this time, since the small diameter pipe 2 is covered and fixed by the exterior concrete 22, it is not subjected to earth pressure from earth and sand, and there is no problem of it coming off from a predetermined position due to the action of this earth pressure.

In addition, in the above, exterior concrete 17
Although the case in which the exterior concrete 22 is cast separately after fixing the small diameter pipe 2 to the large diameter pipe 1 with a holder is illustrated, it is more efficient to cast the exterior concrete 17 and 22 at the same time. That is, as shown in FIG. 4, the small-diameter pipe 2 is directly fixed to the outer surface of the pipe body of the large-diameter pipe 1 using only the fastener 20 and the distance piece 21, and both pipes in this state have an oval cross section. After holding it in the cylindrical formwork 24, the exterior concrete 25 may be poured all at once. Moreover, since the large-diameter pipe 1 is usually cast with the exterior concrete 17 using a cylindrical formwork, the formwork 24 can be obtained by simply modifying the cylindrical formwork a little. Efficient.

Effects of the invention As stated above, according to the invention, small diameter pipes
The action of the exterior concrete not only firmly fixes the pipe to the large diameter pipe, but also prevents it from coming into contact with earth and sand and receiving no earth pressure, which reliably eliminates the problem of the pipe falling out of its designated position during propulsion. Since the pipe is fixed to the large diameter pipe by a fixing member having a fastener and a distance piece, the distance piece prevents interference between the sockets of both pipes and positions the small diameter pipe in a predetermined position. Then, the small-diameter pipe can be reliably fixed to the large-diameter pipe using fasteners, which makes it easy to cover the pipe with exterior concrete.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of one embodiment of the present invention, Figure 2 is a plan view of the main parts in Figure 1, Figure 3 is a cross-sectional view showing an example of exterior concrete pouring work, and Figure 4 is a cross-sectional view showing an example of exterior concrete pouring work.
The figure is a cross-sectional view showing another example of exterior concrete pouring work. 1...Large diameter pipe, 2...Small diameter pipe, 12...Thrust transmission plate, 13...Through hole, 17...Exterior concrete, 18...Fixing member, 22, 25...Exterior concrete, 23, 24... ...Formwork.

Claims (1)

[Scope of utility model registration request] On the outside of a large-diameter pipe for propulsion construction, which has a socket at one end and an socket at the other end, a A small diameter pipe with a port is arranged in parallel with the sockets and insertion ports of both pipes corresponding to each other, and a fastener for attaching the small diameter pipe to the large diameter pipe is attached to the small diameter pipe. and a distance piece interposed in the gap between the large diameter pipe and the large diameter pipe, and the large diameter pipe and the small diameter pipe are integrally covered with exterior concrete. Pipe for the propulsion method.