JPH0475357B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to the burying of water pipes, gas pipes, cable pipes, etc. by digging horizontal holes underground and pushing them into the horizontal holes, especially for long distances. This invention relates to a buried pipe propulsion mechanism in a pipe burying device.

(Prior art) Conventionally, as a burying device for water pipes, etc., a casing is inserted into a continuous buried pipe made by sequentially joining single buried pipes made of humid pipes, and an auger crew is rotatably inserted into the casing. Generally, a so-called extrusion type structure is used, in which the tip of the underground pipe is excavated by the auger screw, and the continuous underground pipe is pressed (extruded) from the rear end and pushed into the ground. However, as the buried distance increases, the risk of cracking increases as the fume tubes closer to the original thrust part become compressed by the stronger pressing force and its reaction force.

As a countermeasure against this, the present inventor first equipped an intermediate pushing means in the intermediate part of the casing, and with the intermediate pushing means locked in the intermediate part of the continuous buried pipe, pushed the casing forward from the intermediate part. We proposed a buried pipe mid-pushing device that advances the buried pipe, then pushes the buried pipe from the middle part to the rear by pushing the buried pipe, and then buries the pipe by alternately pushing the front buried pipe and the rear buried pipe (specially Gansho 60-41282
(Refer to Japanese Patent Application Laid-Open No. 61-200296).

(Problems to be Solved by the Invention) The present invention further improves the previous proposal, simplifies the configuration, and makes it possible to bury pipes with a single propulsion operation instead of an alternating propulsion operation. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the split propulsion mechanism of the present invention includes a casing inserted into a continuous buried pipe formed by sequentially joining single buried pipes, and an auger screw inserted into the casing. In a pipe burying device that rotatably inserts the continuous buried pipe and pushes the continuous buried pipe into the ground while excavating the ground at the tip of the continuous buried pipe, a source pushing means simultaneously presses each rear end of the continuous buried pipe and the casing. dividing the two adjacent buried pipe units in the front and rear at a desired position of the continuous buried pipe, and attaching an intermediate push member provided on the outer circumferential surface of the casing so as to be able to rise and fall freely to the rear end of the front buried pipe unit at the dividing position; It is configured so that it can be pressed forward. Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a main push drive device 1 is installed in a pit P provided at the burial start position.
The original push drive device has a trolley 3 movably mounted on a rail 2 laid on the bottom of the pit, and a continuous buried pipe 4 and each rear end of a casing 5 inserted into the buried pipe 4 at the front end of the truck. A propulsion holder 6 is provided to detachably hold the auger screw 7, and an auger screw 7 rotatably inserted into the casing 5 is provided on the trolley 3.
A rotation drive device 8 such as a motor for transmitting rotation is installed at the rear end of the truck 3, and two hydraulic cylinders 9 for main pushing are installed on both sides of the truck 3. 20...
is a spacer.

The buried pipe 4 is constructed by sequentially adding buried pipes 4a, 4b, and 4c made of humid pipes in the figure, and the casing 5 is arranged so as to form an appropriate space between the inner peripheral surface of the buried pipe 4 and the buried pipe 4. This casing 5 and auger screw 7 are made by sequentially adding casing units and screw units of the same length as the buried pipe unit 4.
In this example, the third buried pipe unit 4c is made slightly shorter to separate it from the adjacent buried pipe unit 4b, and an intermediate pushing device A is attached to the outer peripheral surface of the casing unit 5a inside the pipe at this dividing position. It is equipped with.

The structure of the intermediate push device A is as follows. Second,
In Fig. 3, four sets of intermediate push members are mounted on the outer peripheral surface of the casing 5a at equal angular intervals, and for convenience, looking at one set, there are left and right brackets 10, 1 on the outer peripheral surface of the casing 5a.
0 is provided protrudingly, and the base of the approximately T-shaped intermediate push lever 11 is attached to the brackets 10, 10 on the casing unit 5.
It is supported so as to be swingable on the longitudinal section of a, and when it swings inward, it is inverted so that it is in contact with the outer peripheral surface of the single casing 5a, and when it swings outward, it is supported at the tip of the lever. The casing unit 5 is made to stand up at a position where it abuts the rear end surface of the front buried pipe unit 4b, and to prevent the intermediate push lever 11 from swinging further rearward from its upright position.
A stopper plate 12 is provided protrudingly behind the intermediate push lever 11 on the outer peripheral surface. The other intermediate push levers 11... have the same structure as above.

As a driving means for raising and lowering each set of the intermediate push levers 11, a sliding ring 13 is fitted onto the casing unit 5a so as to be slidable in the longitudinal direction of the casing, and the ring 13 and the intermediate push levers 11...
connecting rods 14, 14, . . .
On the other hand, the hydraulic cylinders 15, 15 are fixed to the outer peripheral surface of the single casing 5a, and the rams 16, 16 thereof are connected to the sliding ring 13.

A cover pipe 17 is placed between the front and rear adjacent buried pipe units 4b and 4c, and the cover pipe 17 has an inner flange 18 protruding from the inner circumferential surface of the almost middle part, and one end of the cover pipe 17 has an inner flange 18 projecting from the inner peripheral surface of the cover pipe 17. Front buried pipe single unit 4b
Attach to the rear end and attach the other end to the rear buried pipe 4
It is slidably fitted onto the front end of c. The length of the cover tube 17 is sufficient as long as it covers the space between the two single bodies 4b and 4c when the intermediate push lever 11 is raised and lowered. Reference numeral 19 denotes a holding leg for holding the casing 5 concentrically within the buried pipe 4.

The operation of the buried pipe division propulsion mechanism of the present invention will be explained next. The ground at the tip of the buried pipe is excavated by the rotation of the auger screw 7, and the trolley 3 is advanced by the extension drive of the hydraulic cylinder 9 for push, thereby simultaneously propelling the buried pipe 4 and the casing 5 by the propulsion holder 6, and the auger The creue 7 is moved forward together with the trolley 3, and after propelling one single buried pipe in this way, the single buried pipes are successively added, and at the same time, the casing 5 and the auger crew 7 are also successively added and propelled. . As an example, if the propulsion reaction force acting on the buried pipe reaches a dangerous value when the buried pipe single bodies 4a and 4b are propelled, a slightly shorter buried pipe single body 4c is used as the buried pipe, and a normal length casing with a medium push device A is attached to the casing. The single unit 5a is joined by raising the middle push lever 11..., and
The propulsion holder 6 holds the respective rear ends of the buried pipe unit 4c and the casing unit 5a. In this way, the continuous buried pipe 4 consisting of the buried pipe single bodies 4a, 4b, and 4c will have a distance d between it and the preceding single pipe 4b corresponding to the length of the buried pipe single body 4c, and the distance d will be used as a boundary. It is divided into front buried pipes 4a, 4b and rear buried pipe 4c.

If the main push cylinder 9 is driven to extend in this divided state, the pushing force will be applied from the propulsion cylinder 6 to the rear end of the front buried pipes 4a, 4b via the casing unit 5a, the intermediate push lever 11, and so on, and from the propulsion holder 6. It is dividedly transmitted to the rear end of the rear buried pipe 4c and propelled respectively. At this time, the rear buried pipe 4c is separated from the front buried pipes 4a and 4b by a distance d and is propelled, so that the pressure reaction force of the front buried pipe is absorbed. Since it receives only its own pressing reaction force, there is no risk of cracking as in the conventional case. Once the buried pipe unit 4c is propelled, a new buried pipe unit of normal length, a casing unit without an intermediate push device A, and an auger screw unit are successively added, and the same divisional propulsion as described above is repeated.

When the desired tube propulsion is achieved, the casing 5 is pulled back slightly and the intermediate push lever 11 is raised.
... is moved to the side of the rear buried pipe unit 4c so that it can be laid down, and then the sliding ring 13 is moved forward by the contraction drive of the hydraulic cylinders 15, 15, and thereby the middle push is made via the connecting rod 14... Lever 11
... is laid down counterclockwise in Figure 2, and in that state the casing 5 is recovered from the buried pipe.

The movable middle push member of the present invention is the middle push lever 11 excluding the driving means such as the hydraulic cylinder 15 in the above example, and when the casing 5 is pulled out during recovery, it is automatically pushed by the front end of the rear buried pipe 4c. It may be something that lies down. In that case, a magnet is attached to either the middle push lever 11 or the stopper plate 12, and the middle push lever 11
It is also possible to make it stick to the stopper plate 12 and maintain its upright state.

(Effects of the Invention) According to the split propulsion mechanism in the pipe burying device of the present invention, the configuration is extremely simple, and moreover, it is efficient due to the single propulsion operation in which each rear end of the continuous buried pipe and the casing is simultaneously pressed by the original pushing means. In addition, in propulsion, the pushing force of the main push means is transmitted to the front buried pipe and the rear buried pipe, which are separated at the required positions, and are propelled independently of each other, thereby By blocking the pressure reaction force from the front buried pipe against the buried pipe, it is possible to prevent the rear buried pipe from cracking due to strong compression.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial vertical sectional side view of a pipe burying device, FIG. 2 is an enlarged vertical sectional side view of the intermediate pushing device, and FIG. be. 1... Original push drive device, 4... Continuous buried pipe, 4
a, 4b, 4c... Single buried pipe, 5... Casing, 6... Propulsion holder, 7... Auger screw, 9... Hydraulic cylinder for main push, 11... Middle push lever.

Claims (1)

[Claims] 1. A casing is inserted into a continuous buried pipe formed by sequentially joining single buried pipes, and an auger screw is rotatably inserted into the casing, while excavating the ground at the tip of the continuous buried pipe. The pipe burying device for pushing the continuous buried pipe into the ground is provided with a source pushing means for simultaneously pressing the rear ends of the continuous buried pipe and the casing, and includes both front and rear adjacent buried pipes at a desired position of the continuous buried pipe. A split propulsion mechanism in a pipe burying device, wherein an intermediate pushing member provided on the outer circumferential surface of the casing so as to be freely undulating is brought into contact with the rear end of the single front buried pipe at the dividing position so as to be able to press forward.