JPH0258515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a joining tool used for joining pipes forming pipes for water supply, sewerage, etc. in a closed space.

[Conventional technology] When burying water and sewerage pipes underground, digging up the ground will cause traffic problems, so it is necessary to excavate a tunnel horizontally and install the pipes in an enclosed space. In many cases, pipes are added.

Alternatively, it has become very common for a new pipe with a slightly smaller diameter to be added to the inside of an old pipe to form a new pipe in duplicate.

When pipe joining is carried out in a conventional open-pit trench, the leading pipe 1a is properly positioned and the nozzle holder is inserted into the bottom, as shown in Figure 5, and the rear pipe 2a is inserted into the socket at the tip. Hold the spout with the concentric shaft.

In order to align the front and rear tube axes, in the case of an open groove, a jib crane, chain block and nozzle head, driving a wedge, etc. are used, but when working in a closed space, hydraulic jacks etc. are used in several places on the tube body. These must be expanded and contracted to align their axes.

Next, when inserting the spout of the rear tube 2a into the socket of the front tube 1a, the sling chain 9 is usually wound around the tapered portion of the outer surface of the socket.

On the other hand, hook several hooks of the wire rope 10 with hooks to the socket end of the rear tube 2a, connect the sling chain and the wire rope with the lever block 11, and operate the lever block to connect the rear tube 2a to the front tube 1.
Push into a.

Even if the specific parts used were slightly different, when connecting pipes, it was customary to perform construction using the procedures and methods described above.

[Problems to be Solved by the Invention] Unlike in open grooves, there are various obstacles when connecting new pipes to form a new pipe in a closed sliding or old pipe. ing.

If the difference between the inner diameter of the tunnel or old pipe and the outer diameter of the new pipe is small and the gap between the two is small, the worker will not be able to enter the gap and will be unable to connect the sling chain and wire rope. The tip of the rear tube cannot be pushed into the socket of the front tube.

In addition, if the gap is too small to join, workers must enter the new pipe and carry out the work, but bringing the joining equipment to the inner surface of the pipe and installing it increases the risk of damaging the inner lining and paint.

Furthermore, if the diameter of the new pipe is small, it becomes impossible for workers to enter the pipe.

In order to carry the rear tube after the leading tube which has been positioned in a closed space, it is placed on a carrier and attached to the rear end of the leading tube, and multiple hydraulic cylinders attached to the carrier are used to move the tube axes of the front and rear tubes. Generally, the position of the posterior canal is determined by matching the

However, since this truck must be quite rocky in order to withstand the transportation of heavy objects, it is often not applicable when the gap is small.

There is also a method of supporting and feeding the tube body only with wheels and axles instead of a truck, but in that case it is difficult to center the tube axes.

In any case, the work was done in an extremely narrow, dark, and closed space, and there were too many problems with conventional work procedures in terms of safety and work efficiency, so a solution was needed.

In order to solve the above-mentioned problems, the present invention aligns the pipe axes of the front and rear pipes and performs the joining work accurately, safely, and efficiently even when the gap between the inner diameter of the tunnel (or old pipe) and the outer diameter of the new pipe is small. The purpose is to provide a joining device that can be used.

[Means for Solving the Problems] The pipe joining device according to the present invention includes an underframe that is movable in the axial direction along the outer periphery of the pipe, and is attached to the front part of the underframe to push up the socket of the leading pipe. The above problem was solved by providing a first hydraulic mechanism and a second hydraulic mechanism attached to the rear part of the underframe to push the spigot of the rear pipe into the socket of the front pipe.

Furthermore, in order to effectively solve the problem based on this invention, there is provided a frame that is movable in the axial direction along the outer circumference of the tube, and a first frame that is attached to the front part of the frame and that pushes up the socket of the tip tube. a hydraulic mechanism, a second hydraulic mechanism that is installed at the rear of the underframe and pushes the spigot of the rear pipe into the socket of the leading pipe, and a third hydraulic mechanism that is installed midway through the underframe and pushes up the tube body of the rear pipe. We propose a related invention comprising:

[Operation] The operation of the present invention will be explained based on FIGS. 1A and 1B and FIGS. 2A to 2E, which show examples.

Here, FIGS. 2A and 2B are shown for the sake of understanding and correspond to the previous stage (known) of the present invention.

The leading pipe 1 has already been positioned and fixed at the top and bottom in a sealed conduit such as a tunnel, and the rear pipe 2 is carried in here as appropriate (Fig. 2 A), and the axes of the leading and trailing pipes are aligned and supported in that position. (Figure 2B).

Figures 1A (front view) and B (side view) show an embodiment of the jointing device of the present invention, which is composed of an underframe 3 and first and second hydraulic mechanisms 4 and 5 attached to the front and rear of this underframe. ,
These are configured to be able to move integrally along the outer periphery of the tube in the axial direction of the tube.

Therefore, as shown in FIG. 2C, the instrument is inserted under the rear tube 2 through the gap and below the joint.

In FIG. 2D, the first hydraulic mechanism 4 installed at the front of the underframe pushes up the socket of the leading pipe, while the second hydraulic mechanism 5 installed at the rear of the underframe pushes the leading pipe from the rear end of the rear pipe 2. In order to press the tip of the rear tube into the socket of the front tube, an action occurs in which the tip of the rear tube is press-fitted into the socket of the front tube.

In this case, the first hydraulic mechanism 4 receives the pressing force applied from the rear end of the rear tube and acts as a reaction force to suppress movement of the underframe.

When the front and rear tubes have been joined, the position of the rear tube is supported and fixed as illustrated in FIG. 2E, and the next tube is carried in repeatedly.

To explain the operation of the related invention described in claim 2, as shown in FIG. 3 showing an embodiment, a third hydraulic mechanism 6 for pushing up the tube body of the rear tube is installed in the middle of the underframe. Therefore, if the tip of the rear tube is attached to the rear end of the front tube by any means, the hydraulic mechanism 6 will act to align the axes of the front and rear tubes, resulting in the action unique to the present invention (see Fig. 2). You can move on to C to E).

That is, in addition to the functions unique to the present invention, the functions of the present invention include a mechanism for carrying out a pre-process that conventionally relied on the functions of different instruments.

[Example] Examples of the specified invention of the present application are shown in FIGS. 1A and B.
Further, related inventions are shown in FIGS. 3A and 3B.

The underframe 3 is a long box body made of steel plates welded into a mouth shape, and two wheels 7, 7 are arranged in the middle on the left and right sides, and the inner diameter of the tunnel (or old pipe) and the outer diameter of the installation pipe are arranged in two places in the middle. The diameter of the ring should be large enough to allow rolling even if the gap between the wheel and the wheel is narrow.

A hydraulic ram 4 is mounted diagonally backward on the tip of the underframe, and is expanded and contracted diagonally backward by the action of a hydraulic mechanism (not shown) provided on the underframe.

A hydraulic ram 5 that expands and contracts forward is attached to the rear end of the underframe.

Further, in the embodiment shown in FIG. 3, hydraulic rams 6, 6 which extend and retract upward are attached to two places on the middle of the underframe, and are used to bring out the center of the rear tube and align it with the front tube.

In the figure, 8 indicates a nozzle stand (board) that fixes or holds the position of the pipe.

4A, B, and C show various embodiments of the first hydraulic mechanism and its pressing action.

[Effect of the Invention] Since the present invention achieves the above-mentioned effect, even if the difference between the inner diameter of the tunnel (or old pipe) and the outer diameter of the new pipe is small and the gap is narrow, it is possible to easily and accurately join the front and rear pipes. can be done.

Compared to conventional joining, worker safety is far more ensured and work efficiency is significantly improved.

When the gap is narrow and the pipe diameter is small, joining work from both the inside and outside of the pipe is obstructed and the work is sometimes impossible, but the present invention makes the work possible.

An effect unique to related inventions is that they more effectively perform the functions of the specific invention.

For example, when the above-mentioned gap is too narrow to use a transport trolley (equipped with a hydraulic ram for centering) as shown in Figure 2A, conventionally, wheels are attached diagonally to the side body of the iron pipe itself and the specified They carried it into position, centered it from inside the tube, and aligned the axes of the front and rear tubes.

As already mentioned, this will damage the lining and paint on the inner surface of the tube, and this type of work is undesirable when the tube diameter is small.

In this case, if the invention is applied, centering and insertion can be carried out consecutively with one joining device, provided that the tube can be brought in by some method, and it is possible to enjoy a great advantage that has not been seen before.

For example, it has become possible to easily construct a new 2000mm pipe within a 2300mm old pipe using the so-called pipe-in-pipe construction method.

[Brief explanation of drawings]

Figures 1A and B are a front sectional view and a side sectional view (-cross section of Figure 1A) of the embodiment of the present application, and Figures 2A to E
3A and 3B are a front sectional view and a side view showing another embodiment, respectively.
4A, B, and C are partial front views showing various embodiments of the first hydraulic mechanism and their pressing action, and FIG. 5 is a front view showing the prior art. 1... Lead pipe, 2... Rear pipe, 3... Underframe, 4,
5, 6...first, second, and third hydraulic mechanisms, respectively.

Claims (1)

[Scope of Claims] 1. Used for joining work in which two pipes forming a conduit are joined together in a closed space, the underframe is movable along the outer periphery of the pipe in the axial direction of the pipe, and the front part of the underframe is A first hydraulic mechanism is installed to push up the socket of the front pipe, and a second hydraulic mechanism is installed to the rear of the underframe and pushes the spigot of the rear pipe into the socket of the front pipe.
A pipe joining device formed with a hydraulic mechanism. 2 Used for joining work in which pipes forming a conduit are joined together in a closed space, with an underframe that is movable in the axial direction along the outer circumference of the pipes, and a socket for the forward pipe that is attached to the front of the underframe. A second hydraulic mechanism is installed at the rear of the underframe and pushes the spigot of the rear pipe into the socket of the leading pipe, and a second hydraulic mechanism is installed midway through the underframe and pushes up the body of the rear pipe. 3. A pipe joining device formed with a hydraulic mechanism.