JPH023028Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a propulsion tube, particularly a propulsion tube of relatively small and medium diameter.

[Conventional technology]

FIG. 1 shows a conventional technique in which a steel pipe collar 1 is used at the joint. Step portions 3 are provided at both ends of the propulsion tube hume tube 2.
One groove 4 for installing a gasket is provided in each of the stepped portions 3, a gasket 5 is installed in each groove 4, and the gasket 5 is inserted into the steel pipe collar 1 through the partition wall 6 of the steel pipe collar 1.
This is a joint structure in which the stepped portion 3 of the propulsion fume pipe 2 is inserted and joined.

[Problem to be solved by the invention] However, with the above joint structure, it is difficult to completely prevent water leakage, especially meandering during propulsion,
If a sudden direction adjustment is made after construction due to local earth pressure or other causes, there is a problem in that pipe circumferential breakage may occur.

In addition, there are various construction methods for propelling small and medium diameter pipes, but the general method is to first propel the steel pipe underground using a rear propulsion jack as a pilot pipe, and then push the fume pipe in sequence. In many cases, the pilot tube is recovered one after another, and in this case, it is common to push the tube twice, which poses the problem of requiring a long time and making the operation troublesome.

The present invention was devised in view of the above-mentioned problems of the conventional technology, and aims to provide a propulsion pipe that is highly effective in preventing water leakage and is easy to construct.

[Means to solve the problem]

In order to achieve the above object, in the propulsion tube of the present invention, a joint step is provided at the longitudinal end, and a gasket is inserted into the groove of the hume tube, which is provided with a groove for holding the gasket in the joint step. In the case where the joint step is installed, the joint step is provided at one end in the longitudinal direction of the hume pipe, and the outer periphery of the hume pipe except for the joint step is covered with a steel pipe, and at the other end of the hume pipe there is a joint step that is approximately the same as the joint step. A joint part of the same width is extended, and a plurality of grooves are provided in the joint step part, and gaskets of different hardness are arranged in these grooves in order to maintain an equal clearance between the joint part and the joint step part. It is configured.

[Effect]

After the gaskets are respectively installed in the grooves of the joint steps, they are inserted into the joints of separate propulsion tubes and connected in sequence.

〔Example〕

Examples will be described with reference to the drawings. Second
In Figures 5 to 5, propulsion tubes A and B of the present invention are shown.
is generally composed of a propulsion hume tube (hereinafter simply referred to as hume tube) 7 and a steel tube 10.

A joint step portion 8 having a predetermined width is provided at one longitudinal end of the hume tube 7 .

Although a small and medium diameter pipe is mainly used as the hume pipe 7, a large diameter pipe may also be used.

Further, this joint step portion 8 is provided with a plurality of grooves 9 in which gaskets 12, which will be described later, are disposed.

The steel pipe 10 covers the outer periphery of the fume tube 7 except for the joint step portion 8, and the other end of the hume tube 7 has a joint portion 1 having approximately the same width as the joint step portion 8.
1 has been extended. Note that the thickness of the steel pipe 10 is set relative to the diameter of the hume pipe 7.

The gasket 12 is disposed in the groove 9 in order to maintain an equal clearance between the joint portion 11 and the joint step portion 8 when connected.

The gasket 12 is made of synthetic resin or rubber with a predetermined hardness that has a large water-stopping effect, and it is preferable to use gaskets with different hardnesses.

Further, this gasket 12 may be solid or hollow.

The gasket located closest to the edge is preferably used as a guide.

Moreover, FIG. 2 shows a case where the pipe 7 is constructed while being swung in the rotational direction by a power cylinder 13. In this case, as shown in FIG. 3, the steel pipe 7 is welded to the
4, construction can be done without damaging the pipe. Further, in this case, since there is a space below the weld 14, it is possible to prevent damage to the concrete due to melting of the steel.

[Effect of idea]

Since the present invention is configured as described above,
This produces the following effects.

(1) Even if there is a sudden direction change due to meandering or other causes during propulsion, it is possible to prevent pipe breakage accidents in the circumferential direction.

For example, when a steel material with an inner diameter of 250 mm and a thickness of 4.5 mm was used, a bending strength 4 to 5 times that of the conventional material was obtained.

(2) Even if earth pressure is locally applied to the joint after construction, breakage of the pipe in the circumferential direction can be prevented, and it can be used for a long period of time.

(3) Propel the steel pipe underground as a pilot pipe,
In the propulsion method in which the fume pipes are then pushed one after another and the pilot pipes are recovered one after another, 2
Normally, it would be pressed twice, but with this invention, this can be done in one step.
A significant improvement in construction efficiency can be achieved.

(4) With conventional joint structures, water leakage after construction was a problem, but in this invention, the joint part is tightly bonded to the steel pipe and concrete, so water leakage can be completely prevented. has a similar effect.

(5) When constructing pipes while swinging them in the rotational direction using a power cylinder, it is effective to use welded steel pipes, and construction can be performed without damaging the pipes. In addition, in this case, since there is a space below the weld, damage to the concrete due to melting of the steel can be prevented.

(6) In addition, by using multiple gaskets, the clearance between the joint and the joint step can be maintained evenly using one gasket as a guide, which prevents water leakage due to gaskets turning over, and when the groundwater level is high. It has the advantage of being suitable from the point of view of complete water stoppage.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main part of a joint in a conventional propulsion tube, Figure 2 is an explanatory diagram of another embodiment of the present invention, and Figure 3 is a partial cross-section of a joint in the embodiment shown in Figure 2. 4 is a longitudinal sectional view of the propulsion tube in the longitudinal direction, and FIG. 5 is a sectional view of the joint portion.

Claims (1)

[Scope of utility model registration request] In a fume tube having a joining step at the longitudinal end and a groove for holding the gasket in the joining step, the gasket is attached to the groove, and the joining step is located at one end in the longitudinal direction of the hume pipe. Provided at the end, the outer periphery of the hume pipe except for the joint step portion is covered with a steel pipe, and a joint portion having approximately the same width as the joint step portion extends on the other end side of the hume pipe, and the joint step portion is provided at the end portion. with multiple grooves,
The propulsion tube is characterized in that this groove is provided with gaskets of different hardness in order to maintain an equal clearance between the joint part and the joint step part.