JPS6118299Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a joint for a large-diameter propulsion steel pipe used for pressure pipes in waterworks and the like.

Propulsion steel pipes are generally constructed by connecting multiple steel pipes at the front and back to form one long rigid beam with high pressure resistance.
The ends of the tubes are welded together after they come into contact with each other. When laying such propulsion steel pipes, the steel pipes that are sequentially supplied to the installation location are press-fitted into the soil using jacks, etc., and the rear end of the leading pipe and the front end of the trailing pipe are welded, and then the welded pipes are Since the above-mentioned work was repeated for each short pipe of 4 to 6 meters, the work was extremely complicated, the construction period was long, and it was also uneconomical.

In addition to the welded joint type described above, there are other types of joints that have propulsion transmission properties and water-stopping properties, such as flange type, socket type, split reinforcement plate type, and segment type, but all of them use rubber etc. as bolts and supports. The structure uses a pressure plate to stop the water from being compressed, and transmits the thrust with a bearing plate reinforced with flange surfaces and ribs, etc., so the joint becomes thick on the inner and outer surfaces of the pipe, making the thrust cross section large, which is uneconomical. Moreover, it is disadvantageous for carrying out earth and sand and welding work.

Joints other than propulsion steel pipes include socket types such as quick-build steel pipes and clamping pressure plate types, but none of them have propulsion force transmission performance. In addition, there is a joint construction method in which a backing metal is provided on the upper semicircular part of the pipe end and the lower semicircular part of the next pipe end used for piping leading into tunnels, etc., and the fittings are welded from the inside. It had no power transmission performance.

In this way, conventional joints for propulsion steel pipes of the welded joint type have improved water-stopping performance and improved construction time by not performing welding work before the propulsion work, but by performing the welding work all at once after the propulsion work. There were no joints capable of transmitting propulsion.

The purpose of this invention is to shorten the construction period by not performing welding work before the propulsion work and to perform the welding work all at once after the propulsion work as a welded joint type joint for propulsion steel pipes, resulting in highly efficient construction. This product provides a joint for a propulsion steel pipe that has both excellent propulsion transmission performance and water-stopping performance as a propulsion steel pipe.The front and rear ends of the propulsion steel pipe are successively press-fitted into the soil to form a pipeline. A short tubular backing metal is fitted and welded to the outer periphery of one end of one of the abutting tubes, and one end is fitted and welded to the outer periphery of this backing metal,
a tubular socket whose other end protrudes from the protruding end of the backing metal; an annular packing material interposed between the inner circumferential surface of the socket and the outer circumferential surface of the end of the other tube; It is characterized in that it consists of a filling material filled in an annular closed space surrounded by a backing metal, a backing metal, and a socket, and mechanical coupling members for temporary fixing provided at corresponding positions inside the ends of both tubes. It is something.

Next, the structure of the joint of this invention will be explained by way of examples with reference to the drawings.

Fig. 1 shows a longitudinal sectional side view of an embodiment of the joint of this invention in a used state after joining is completed, and Fig. 2 shows a sectional view of half of the part taken along the line X--X in Fig. 1. has been done. As shown in the drawing, the joint of this embodiment fits and welds the front and rear ends of the propulsion steel pipes that are successively press-fitted into the soil to the outer periphery of the rear end of the leading pipe 1 of the pipes that abut each other. a short tubular backing metal 2, one end of which is fitted and welded to the outer periphery of the backing metal 2, and a tubular socket 3 extending a predetermined length rearward from the protruding end of the backing metal 2; and the leading pipe 1. The socket 3 and the tube body 5 of the subsequent tube 5 are fitted in advance to the outer periphery of the exposed portion of the tube body 5A of the tube that will become the subsequent tube 5, and the tip is shaped to form a welding groove 4 with the rear end.
A flexible packing material 6 made of rubber or the like is inserted in a compressed and deformed state between A and A, and on the inside of the socket 3, the rear end of the backing metal 2 and the tube body 5A of the succeeding tube 5 are exposed. It has a water leakage prevention filler 7 to be filled into the sealed space formed by the outer circumferential surface of the tube and the packing material 6. In order to inject the filler 7, there is a filler 7 at the tip of the tube main body 5A of the succeeding tube 5. At a close vertically symmetrical position,
Filling ports 8A and 8B are provided.

Filling ports 8A and 8B have plugs 9A and 9, respectively.
B is screwed together, and when injecting the filler,
Both plugs 9A and 9B are removed, and the filling material 7 is injected from the lower filling port 8B, for example, and when the filling material 7 overflows from the upper filling port 8A, the injection is stopped, and both plugs 8A are filled. , 8B, screw the plugs 9A, 9B onto them and close them.

Furthermore, in the joint of this invention, inverted L-shaped metal fittings 10, 1 are provided as mechanical coupling members for temporary fixing at corresponding positions inside the ends of the leading pipe 1 and the trailing pipe 5 that abut each other.
0 is set.

The inverted L-shaped fittings 10 are installed at three locations: at the upper end of the inner surface of both tubes, and at the lower left and right positions, and generally at equal angle division positions.

The two inverted L-shaped fittings 10, 10 are connected by the third
As shown in the exploded perspective view in the figure, the connecting section 11
and a predetermined number of bolts 12 and nuts 13.
For this reason, the inverted L-shaped fittings 10, 10 and the connecting piece 11
has bolt through holes 14 and 15 at corresponding positions.
is provided.

Each tube has a coating layer 16 made of polymer cement or the like on its outermost layer except for the exposed portion of the tube end, and between the end surface of the socket 3 of the leading tube 1 and the end surface of the coating layer 16 of the trailing tube 5. is filled with a joint material 17.

Furthermore, in the unloaded state, the packing material 6
It has a circular cross section as shown in the figure.

The function and effect of the joint of this invention having the above-mentioned structure will be described. In order to bring the tip of the trailing tube 5 into contact with the rear end of the leading tube 1, the tip portion of the trailing tube 5 fitted with the packing material 6 is inserted into the socket 3 and backing metal 2 of the leading tube 1. At this time, a removable jig with a tapered inner edge, indicated by reference numeral 18 in FIG. 4, is attached to the rear end of the socket 3 to facilitate fitting of the packing material 6 through compression deformation.

Furthermore, when the trailing tube 5 is moved forward, the tip of the tube body 5A of the trailing tube 5 eventually connects to the rear end of the backing metal 2. At this time, if the inner edge of the rear end of the backing metal 2 is formed into a taper 2A, fitting into the backing metal 2 becomes easy.

When fitted in the correct position, the inverted L-shaped fitting 10 on the trailing pipe 5 side will fit into the inverted L-shaped fitting 1 on the leading pipe 1 side.
0, so at this time, the connecting piece 11, bolt 12, and nut 13 are used to temporarily fasten both. This completes the temporary fixing of the leading pipe 1 and the trailing pipe 5.

At this time, a welding groove 4 is formed at the tip of the trailing pipe 5 of the leading pipe 1. Next, filling port 8A,
Plugs 9A and 9B of 8B are removed and filler 7 is injected, while joint material 17 is applied.

Among these operations, the construction of the joint material 17 must be performed before the subsequent pipe 5 is pressed into the soil, but the filler material 7 may be injected from the inside of the pipe at any time after press-fitting. .

In this way, the propulsion steel pipes are press-fitted and propelled one after another almost continuously, and finally, the welding groove 4 is welded all at once from inside the pipe.

If the inverted L-shaped metal fittings 10, 10 used for temporary fixing are likely to increase fluid resistance, they may be removed by fusing when welding is completed.

As is clear from the above description, the joint of this invention includes a short tubular backing metal that is fitted and welded to the outer periphery of the end of one pipe, and one end that is fitted and welded to the outer periphery of the backing metal. It has a tubular socket whose other end extends beyond the protruding end of the backing metal, and an annular packing material interposed between the inner circumferential surface of the socket and the outer circumferential surface of the end of the other tube. Therefore, when the tip of the connecting tube is inserted into the rear end of the leading tube, the tip of the trailing tube comes into contact with the rear end of the backing metal. Then, the leading pipe and the following pipe are temporarily fastened by mechanical coupling members for temporary fastening provided at corresponding positions inside the ends of both pipes, and the packing material is further surrounded by a backing metal and a socket. By filling the annular closed space with filler material, all the steel pipes can be temporarily joined with high water-stopping ability without welding work before the propulsion work. After all the steel pipes have been temporarily joined in this manner, the welding grooves are welded all at once from inside the pipes, thereby joining the propulsion steel pipes in a short construction period. in this way,
According to the invention of the present application, a high water-stopping ability can be obtained from the beginning without impairing the propulsion ability of the propulsion steel pipe, and even if the pipe is welded later, the water-stopping ability is not affected, and in particular, Since it enables the continuous press-in of propulsion steel pipes into the ground, it is possible to significantly reduce the construction period, and has the advantage of making the propulsion steel pipe construction method more economical than any conventional type of joint.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an embodiment of the joint of this invention in use, Fig. 2 is a sectional view showing half of the part taken along the line X-X of Fig. 1, and Fig. 3 is an inverted L-shaped fitting part. FIG. 4 is an exploded perspective view and a vertical sectional side view showing the upper half of the structure immediately before joining. In the drawings, 2...Backing metal, 3...Socket, 6...Packing material, 7...Filling material, 10...Inverted L-shaped fitting, 1
1... Connecting piece, 12... Bolt, 13... Nut, 14, 15... Bolt through hole.

Claims (1)

[Scope of utility model registration request] A joint for propulsion steel pipes that is sequentially press-fitted into the soil to form a conduit, with a short tubular back that is fitted and welded to the outer periphery of one of the pipes that brings the front and rear ends of the propulsion steel pipes into contact with each other. a tubular socket, one end of which is fitted and welded to the outer periphery of the backing metal, and the other end protruding from the protruding end of the backing metal; an inner peripheral surface of the socket and the other end of the tube; An annular packing material interposed between the outer circumferential surface of the tube, a filler filled in an annular closed space surrounded by the packing material, the backing metal, and the socket, and a filling material at corresponding positions inside the ends of both tubes. 1. A joint for a propulsion steel pipe, comprising a mechanical coupling member for temporary fixing.