JPS6282200A - Bending propelling of embedded pipe and apparatus for bending embedded pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention allows a buried pipe to be propelled into the ground while being bent.
This invention relates to a buried pipe bending device for bending a single installed pipe to a predetermined angle.

Conventional technology When underground pipes are laid underground using conventional propulsion methods, most of the time the pipes are laid straight ahead, but recently there has been an increasing demand for the pipes to be laid bent in an S-shape, for example. There is.

Conventionally, when laying buried pipes by bending them into an S-shape, etc., as shown in FIG. It is constructed so that it curves at a predetermined curvature.

Problems to be Solved by the Invention However, with the above-mentioned conventional construction method, the inclusions inserted between the descendant pipes cannot be recovered after the buried pipe α is laid, and a concentrated load is generated on the side where the inclusions are inserted during propulsion. There were problems such as two cracks in the buried pipe α and water leakage after construction.

This invention was made for the purpose of improving the above-mentioned problems.

Means and effect for solving the problem A bending device main body is interposed at intervals in the circumferential direction at each connection part of the buried pipe, and a jack provided on the bending device main body is expanded and contracted to connect each buried pipe. While bending at a predetermined angle,
A method of bending and propulsion of buried pipes, which enables the buried pipes to be laid underground with a predetermined curvature by propelling the buried pipes underground with a propulsion device, and a plurality of pipes in which a part of the buried pipes is in contact with the connection surface of each buried pipe. a set of jack bases, a jack that is interposed between these jack bases and that bends the buried pipe at a predetermined angle by expanding and contracting, and a support member that holds the jack base at intervals in the circumferential direction of the buried pipe. A buried pipe bending device which enables the buried pipe bending and propulsion method described above.

Example An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a buried pipe 1 that is propelled underground along a predetermined curve 1, for example an S-shaped curve, and an excavator (not shown) is at the tip of the first buried pipe 1.

A propulsion device (not shown) is installed behind the buried pipe 1 at the rear end.

Moreover, a bending device main body 2 for bending each buried pipe 1 at a predetermined angle is installed between each buried pipe 1. The bending device body 2 is installed at a plurality of locations, for example, four locations, at equal intervals in the circumferential direction of the buried pipe 1, and is configured as follows.

That is, the bending device main body 2 has a jack base 3 installed along the inner surface of the buried pipe 1. The jack bases 3 have a pair of substantially the same shape, each having a face plate 3α having substantially the same curvature as the inner circumferential surface of the buried pipe 1. Concave portions 3b and convex portions 3C are alternately formed at the opposing ends of each face plate 3a so as not to interfere with each other (see Fig. 4), and on the outer circumferential surface of the end side, the connecting portion end surface of the embedded W1 is formed. A contact plate 3d that abuts on jα is provided in a protruding manner.

Each backing plate 3d has a reinforcing rib 3e projecting on the convex portion 3C.
is fixed to the backing plate 3dk, thereby reinforcing the backing plate 3dk against the horizontal force applied to the backing plate 3d.

On the other hand, jack receivers 3f are provided upright on the inner circumferential surface of each of the face plates 3α at positions facing each other.

A reinforcing lip 3I is fixed to the back side of each jack receiver 3f, reinforcing the jack receiver 3f against the horizontal force applied to the jack receiver 3f, and between each jack receiver 3f, A jack 4 such as a hydraulic jack is provided. The above-mentioned jack 4 consists of a cylinder 4α and a ram 4b that expands and contracts with the hydraulic pressure supplied into the cylinder 4α from the propulsion device side via a hydraulic piping 5, and the rear end of the cylinder 4α and the tip of the ram 4b are connected to each jack base 3. It is provided so as to come into contact with the jack receiver 3f, and a band or the like is attached to the inner surface of the face plate 3α of each jack base 3 by means 6.

Also, on both ends of the inner circumferential direction of each face plate 3α is a platen) 3A.
are provided protrudingly, and both ends of a support member 7 for holding each jack base 3 at equal intervals in the circumferential direction of the buried pipe 10 are brought into contact with these platans 3A via an elastic body 8 such as a rubber plate. There is. The support member 7 has an arc shape, and both ends are attached to the outside of each bracket 3A by fixing devices 9 such as bolts so that the support member 7 is located between each jack base 3.
It is removably attached to one side.

Next, to explain the method of bending and propelling the buried pipe I using the above-mentioned bending device, we will first explain the method of bending and propelling the buried pipe I.
The excavator and the buried pipe 1 following it are propelled into the ground by the installed propulsion device, and between each buried pipe 1, a plurality of jack bases 3 are placed at equal intervals in the circumferential direction of the buried pipe 1 by means of a support member 7. Interpose it in a state where it is held so that it becomes . At this time, a backing plate 3d protruding from the outer peripheral surface of the face plate 3a of each jack base 3? The jacks 4 are brought into contact with the end faces of the connecting parts of the buried pipes 1, and are mounted horizontally on the inner circumferential surface of the face plate 3α of each jack base 3 by mounting means 6 so as to be parallel to the propulsion direction.

When the buried pipe 1 reaches the position where the buried pipe 1 is bent during propulsion, oil pressure is supplied to each jack 4 of the bending device main body 2 to bend the buried pipe 1 on the side that will be the outer periphery of the bent part (as shown in FIG. 1). Stretch the jack 4 marked with ◯ A) so that it has a predetermined curvature.

If the buried pipe 1 is further propelled in this state, the thrust will be transmitted to the buried pipe 1 in front of each bending device main body 2.
The propulsion force on the connecting surface 1α of the buried pipe 1 is uniformly distributed, so that the buried pipe 1 can be propelled along a predetermined curved line without causing cracks or the like on the connecting surface 1α of the buried pipe 1.

Further, when the buried pipe 1 is bent into an S-shape, the jack 4 on the outer circumferential side of the bent portion (marked with the circle B opposite to the circle mark A described above) may be further extended to advance the buried pipe v1.

When the propulsion of the buried pipe 1 is completed by the above method, the hydraulic pressure is extracted from the jack 4 of each bending device main body 2 to shorten the jack 4, and in this state, the fixing that connects the jack base 3 and the support member 7 that holds it is fixed. After removing the tool 9, the jack base 3 can be extracted from between the buried pipes 1 and recovered.

The elastic body 8 interposed between each jack base 3 and the support member 7 is designed to absorb errors in the installation position of each jack base 3 so that each jack base 3 can be held. be.

Further, even if the diameter of the buried pipe 1 is varied by changing the length of the support member 7, each bending device main body 2 can be used as is.

Effects of the Invention As detailed above, this invention enables the buried pipes to be propelled while being bent to an arbitrary curvature by expanding and contracting the jack of the bending device body interposed between each buried pipe. At the same time, since the thrust force is transmitted to the buried pipe in front via each bending device main body, no concentrated load is generated on the buried pipe connection surface. This eliminates problems such as water leakage after construction due to cracks generated on the connection surface, and is economical because the bending device main body can be recovered and reused after the buried pipe is buried. In addition, simply replace the support member that holds the jack base with one that matches the diameter of the buried pipe.
It is highly versatile as it can be applied to buried pipes of various diameters.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an explanatory diagram of the buried pipe propulsion state, Fig. 2 is a layout diagram of the bending device main body interposed at the connection part of each buried pipe, and Fig. 3 is an explanatory diagram of the propulsion state of the buried pipe. 111-1, FIG. 4 is an enlarged plan view of the main body of the bending device i, FIG. 5 is the same sectional view, FIG. The figure is a view taken in the direction of the arrows ``--'''' in FIG. 5, and FIG. 6 is an explanatory view of the conventional device. 1 is a buried pipe, 2 is a bending device body, 3 is a jack base,
4 is jealous.

Claims (1)

[Claims] 1. A bending device main body 2 is interposed at intervals in the circumferential direction at each connection portion of the buried pipe 1, and a jack 4 provided on the bending device main body 2 is expanded and contracted to A method for bending and propulsion of a buried pipe, characterized in that the buried pipe 1 is propelled underground by a propulsion device while bending the pipe 1 at a predetermined angle. 2. A plurality of pairs of jack bases 3 that partially contact the connection surface 1α of each buried pipe 1, a jack 4 interposed between each of the jack paces 3, and a plurality of jack bases 3 at intervals in the circumferential direction of the buried pipe 1.