JPH0344198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an intermediate pushing device in a pipe burying device that excavates a horizontal hole underground for water pipes, sewer pipes, etc. and pushes it into the horizontal hole.

(Prior Art) Conventionally, as a burying device for water pipes, etc., a casing is inserted into a continuous buried pipe formed by sequentially joining single buried pipes made of hume pipes, and an auger crew is rotatably inserted into the casing. A so-called extrusion type structure is generally used, in which the tip of the buried pipe is excavated by the auger screw, and the continuous buried pipe is pushed from the rear end (prime push) to be propelled into the ground. However, in the case of long-distance burial, there was a drawback that the pressing force of the original push was insufficient, or even if a strong pressing force was obtained, the hume pipe could crack. As a countermeasure for this, in a large-diameter pipe burying device, a worker enters the buried pipe, attaches an intermediate pushing means such as a hydraulic cylinder to the appropriate intermediate part of the continuous buried pipe, and uses the intermediate pushing device to intermediately push the buried pipe in front from the intermediate part. A method was proposed in which a worker enters the buried pipe and retrieves the intermediate pushing device after burying the pipe, but this intermediate pushing method cannot be implemented for small-diameter pipe burying devices where workers cannot enter.

(Problems to be Solved by the Invention) An object of the present invention is to provide a medium-pressing device that can perform medium-pushing even in a small-diameter pipe burying device and can be easily recovered after burying.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following features: A casing having a space between it and the inner peripheral surface of the buried pipe is inserted into a continuous buried pipe formed by sequentially adding single buried pipes. In a pipe burying device that rotatably inserts a screw into the casing and pushes the buried pipe into the ground while excavating the ground at the tip of the buried pipe, it is located at the connection point between both the front and rear adjacent buried pipes. Then, the intermediate pushing means for pushing the rear end face of the single buried pipe at the front part forward can be opened and closed from a closed position along the outer peripheral surface of the casing to an expanded position facing the rear end face of the single buried pipe at the front part. , attached to the outer circumferential surface of the casing, and sliding a cover tube of a length to cover between the front and rear buried pipes when pressed inside, on the rear end of the front buried pipe alone and the front end of the rear buried pipe alone. It has a structure that allows them to fit together freely. 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. 23... 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 also added sequentially in the same way as the buried pipes, and in this example, the third buried pipe 4c is a steel pipe with a smaller diameter than the buried pipe 4.
is appropriately shortened, and an intermediate pushing device A is provided within the space between the casing 5 and the buried pipe 4 at the connection portion between the buried pipe single body 4c and the buried pipe single body 4b adjacent thereto.

The structure of the intermediate push device A is as follows. Second,
3, four sets of intermediate pushing means are mounted on the outer circumferential surface of the casing 5 at equal angular intervals, and for the sake of convenience, looking at one set, there are left and right pairs of brackets 10, 10 on the outer circumferential surface of the casing 5.
Two pairs of brackets 10, 10, 10, 10 are provided protruding at intervals in the longitudinal direction of the casing 5, and each bracket 10
Links 11 of the same length are connected to each other so as to be able to swing freely on the longitudinal section of the casing 5, and a hydraulic cylinder 12 as an intermediate pushing means is installed at the tip of each link 11 parallel to the longitudinal direction of the buried pipe 4. At this time, the longitudinal spacing of the connecting points of the two pairs of links 11, 11, 11, 11 in the longitudinal direction with respect to the hydraulic cylinder 12 is set so that the two pairs of brackets 1
equal to the longitudinal spacing of the connection points for 0, 10, 10, 10, so that the casing 5, the links 11, 11, 11, 11 and the hydraulic cylinder 12
are used as four links to form a parallel link mechanism that swings on the longitudinal section of the casing 5, and its hydraulic cylinder 1
2 is supported so as to be able to move in parallel from a closed position where it is attached to the outer peripheral surface of the casing 5 to an expanded position where it extends between the end faces of the adjacent buried pipe units 4b and 4C.
Reference numeral 13 denotes a patch plate provided on the end surface of the hydraulic cylinder 12, and reference numeral 15 denotes a patch plate provided on the end surface of the ram 14 of the cylinder 12. Other intermediate pressing means are also the same as above.

A sliding ring 16 is fitted into the casing 5 so as to be slidable in the longitudinal direction of the casing, as a driving means for opening and closing each set of medium press hydraulic cylinders 12.
The ring 16 and the two pairs of links 11, 1 of each set
1, 11, 11 are connected to the intermediate portions of a pair of links by connecting rods 17, 17, . 18 rams and the sliding ring 16 are connected by a connecting rod 19.

A cover pipe 20 is fitted between the front and rear adjacent buried pipe units 4b and 4c, and the cover pipe 20 has an inner flange 21 protruding from the inner peripheral surface of one end thereof. The flange 21 is fitted into the rear end of the single front buried pipe 4b.
is brought into contact with the rear end surface of the unit 4b, and the other end is slidably fitted into the front end of the rear buried pipe unit 4c.
The length of the cover tube 20 is 4 when pressed in the middle.
It is designed to cover the area between b and 4c. 22... are holding legs for holding the casing 5 concentrically within the buried pipe 4.

The function of the above-mentioned intermediate push device will be explained next along with the pipe embedding operation. As shown in Fig. 1, the intermediate pushing device A is equipped, and the intermediate pushing hydraulic cylinders 12 are inserted between the two buried pipe units 4b and 4c in a contracted state, and the main pushing device 1 is used to bury the pipe normally. When the specified propulsion resistance occurs, stop the main push,
First, the intermediate push hydraulic cylinders 12... are driven to extend, and the buried pipes 4a, 4b in front are moved from the single buried pipe 4b.
(hereinafter referred to as the front buried pipe)
The project will be promoted together with excavation. In that case, the casing 5 is pulled forward by the front buried pipes 4a and 4b, and the auger screw 7 is moved forward together with the forward movement of the casing 5. In order to make these possible, the main push drive device 1 is equipped with a conventionally known mechanism. When the intermediate push cylinder 12... is propelled by one stroke, the cylinder 12... is reduced, and then the main push device 1 propels each buried pipe behind the buried pipe unit 4c (hereinafter referred to as rear buried pipe). . The front end of the rear buried pipe is the middle push cylinder 1
2..., the original push is stopped and the intermediate push cylinder 12... is used again to propel the front buried pipe, and this process is then repeated one after another to propel the continuous pipe to the desired length.

After the tube propulsion is completed, after contracting the intermediate push cylinders 12..., the opening/closing hydraulic cylinders 18, 18 are driven to extend and the ring 16 is slid to the right in FIG. 2, thereby causing each intermediate push cylinder 12... The bundle is moved parallel to the casing 5 and attached to the outer peripheral surface of the casing. Next, the rear buried pipe is propelled by the main pushing device 1, its front end is joined to the rear end of the front buried pipe by sandwiching the flange 21 of the cover pipe, and the head portion of the auger screw 7 is then pulled out forward. The casing 5 and the auger screw 7 are successively pulled out from inside the buried pipe 4 toward the pit P. At this time, since the intermediate pushing device A is compactly bundled around the outer peripheral surface of the casing 5, it can be pulled out smoothly.

In the other embodiment shown in FIG. 4, one end of the intermediate push lever 62 in four sets of intermediate push means is connected to
A pair of brackets 60 protruding from the outer peripheral surface of 5,
60 so that it can swing from a closed position to the outer peripheral surface of the casing to an expanded position where the tip faces the rear end surface of the front buried pipe unit 54b, and
The sliding ring 66 in the opening/closing drive means of each set of intermediate push levers 62 is connected to the abutment plate 63 provided at the tip of the intermediate push lever 62 through a connecting rod 67, and the middle push lever 62 is moved forward and backward by the movement of the casing 55. ... to propel the front buried pipe,
Other structures are substantially the same as in FIGS. 1, 2, and 3. In order to perform the intermediate push according to this example, in the main push drive device 51, as shown in the fifth and sixth figures, a holder 74 that removably holds the rear end of the casing 55 is fixed to the front part of the cart 53, and
A holder 5 that detachably holds the rear end of the buried pipe 54
6 is separated from the truck 53 and the holder 74 is positioned in front, and each ram 76 of a plurality of auxiliary hydraulic cylinders 75 horizontally fixed to the holder 56 is fixed to the holder 74. In operation, as shown in Figures 5 and 6, with a space between the holders 56 and 74 and the buried pipes 54b and 54c in contact, first release the hydraulic pressure of the auxiliary cylinders 75, and then release the main push cylinder 59. , 59 move the trolley 53 forward and push the casing 55 and screw 57 forward, thereby propelling the front buried pipe via the intermediate push levers 62 .
When the holders 56 and 74 come into contact, the above-mentioned intermediate push is stopped, and then the holder 56 is advanced by the extension drive of the auxiliary cylinders 75, thereby propelling the rear buried pipe, and the above-described operations are repeated in sequence.

After the pipe embedding is completed, the casing 55 is moved slightly backward to separate the backing plates 63 from the rear end of the buried pipe 54b, and then the middle push levers 62 are moved to the outer peripheral surface of the casing 55 by the extension drive of the opening/closing drive hydraulic cylinders 68, 68. The casing 55 and auger screw 57 are pulled out from inside the buried pipe and recovered.

(Effects of the Invention) According to the intermediate pushing device in the pipe burying device of the present invention, it is possible to perform the intermediate pushing even in the burying device for small diameter pipes, and furthermore, after the pipe burying is completed, the intermediate pushing means is closed to the outer peripheral surface of the casing. This makes it possible to extract the pipe together with the casing from inside the buried pipe, making it extremely useful.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partial vertical side view of the entire pipe embedding device, FIG. 2 is an enlarged view of the intermediate push device portion in FIG. 1, and FIG.
Fig. 4 is an enlarged vertical sectional view of another embodiment, and Figs. 5 and 6 are a side view and a plan view of the main push drive device for the other embodiment of Fig. 4. . 4,54...Continuous buried pipe, 4b,54b...Single front buried pipe, 4c,54c...Single rear buried pipe, 5,55...Casing, 7,57...Auger screw, 12...Medium push Hydraulic cylinder, 6
2... Middle push lever, 20, 70... Cover tube.

Claims (1)

[Scope of Claims] 1. Inserting a casing having a space between it and the inner circumferential surface of the buried pipe into a continuous buried pipe formed by sequentially adding single buried pipes, and inserting an auger screw into the casing so as to be rotatable. In the above-mentioned pipe burying device that excavates the ground at the tip of the buried pipe and pushes the buried pipe into the ground, the rear end surface of the front buried pipe single unit at the connection part of both the front and rear adjacent buried pipe single units. An intermediate pushing means for pushing forward is attached to the outer circumferential surface of the casing so that it can be opened and closed from a closed position along the outer circumferential surface of the casing to an expanded position facing the rear end surface of the single front buried pipe, and An intermediate push device for a pipe burying device, in which a cover pipe of a length that covers the space between the front and rear buried pipe units is slidably fitted to the rear end of the single pipe unit and the front end of the rear buried pipe unit when the intermediate push is performed. .