JPS594798A - Pipe propelling apparatus - 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 The present invention relates to a pipe propulsion device that installs a buried pipe by propelling it into the ground.

Conventionally, the method of laying pipes such as water conduits in the ground under roads without excavating the upper surface of the road involves attaching a hole-expanding pipe to the rear end of a lead pipe installed in the ground in advance. The hole-expanding pipe body is pushed into the ground from the rear with a propulsion jack or the like to propel it along the leading small diameter hole formed by the laid pipe in the direction of the reaching side shaft, and a buried pipe is added to the rear of the hole-expanding pipe body. The buried main pipe is laid by performing the above work again.

However, in this conventional method, a large compressive stress is generated in the hole-expanding pipe and the buried main pipe due to the above-mentioned pushing, so it is necessary to use a material with high compressive strength for the buried main pipe, etc. It was impossible to install relatively fragile pipes made of such materials.

There is another method in which a propulsion tube with a blade at the tip is pressed into the ground from behind using a propulsion jack, but in this method, as the propulsion tube is forced into the ground, The mechanism for discharging the excavated soil pushed into the propulsion pipe from the cutting edge to the ground was troublesome and took time to lay the pipe.The present invention eliminates all the drawbacks of the above conventional methods, and A tube propulsion device that has self-propulsion capability, eliminates the need for pushing from the rear shaft, and can easily and efficiently carry out the removal of excavated soil that is pushed into the tube as the propulsion tube is propelled. Its purpose is to crush the excavated soil pushed into the propulsion pipe with high-pressure fine jet water from a nozzle that moves in a swirling motion, and then discharge the shattered soil through the earth removal pipe using compressed air. A clamp mechanism is provided at a predetermined position of the leading laying pipe which penetrates the inside of the propulsion pipe and extends in the propulsion direction, and the above-mentioned clamp mechanism is provided only when the propulsion jack installed inside the propulsion pipe is in operation The clamp mechanism works to apply a reaction force to the propulsion jack from behind, allowing the propulsion tube to propel itself.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of the present invention, and FIG. 1 is a longitudinal conceptual diagram showing an outline of the tubular propulsion device according to the present invention,
2 and 3 are schematic cross-sectional views taken along line AA and line BB in FIG. 1, respectively, and FIG. 4 is a conceptual diagram showing a state in which the propulsion tube 1 is self-propelled.

A tube propulsion device platform, a propulsion tube 1, a pressure chamber 2 formed in the front part of the propulsion tube, a partition wall 3, a leading laying pipe 4, a nozzle 6 provided at the tip of a high-pressure water pipe 5, and an air pipe 7. , an earth discharge pipe 8 , a pressure wall body 9 , a propulsion jack 10 , and a clamp mechanism 1
1.

ing.

The above-mentioned 7 propulsion tubes 1 have a cutting edge 12 formed at their tip opening edge 1α to facilitate the press-fitting and propulsion of the propulsion tube into the ground, and the following main tube is connected to the rear end through an appropriate connector not shown. (not shown) are connected.

A pressure chamber 2 is formed in the front part of the propulsion tube 1, and as the propulsion tube 1 moves forward, excavated soil 13 is pushed to an appropriate size as shown in the figure. The pressure chamber 2 is defined from the rear by a partition wall 3 provided in the diametrical direction of the propulsion tube 1 and integrally and airtightly connected to the inner circumferential surface of the propulsion tube 1.

A leading installation pipe 4 is installed in the propulsion pipe 1 and is embedded in advance in the target propulsion direction from behind the propulsion pipe 1 through the partition wall 3 and in front of the propulsion pipe 1. In this case, a guide pipe 14 is fitted to the outer periphery of the pressure chamber 2 of the advance pipe 1 and a corresponding position slightly in front of it to the ground, and the guide pipe 14 is fitted with a sliding motion. 1, and serves as a guide when the propulsion tube 1 is self-propelled, which will be described later.

A high-pressure water pipe 5 is disposed inside the propulsion pipe 1, penetrating the lower part of the bulkhead 3 in a watertight manner, and a pair of nozzles 6.6 are attached to the tip of the high-pressure water pipe 5. By the motor 17 meshed with the gear 1.5.16,
The nozzle 6.6 is rotatable around the axis of the high-pressure water pipe 5.

The rear end of the high-pressure water pipe 5 is connected via a swivel 18 to appropriate high-pressure water pumping means provided in a rear shaft (not shown).

The air pipe 7 has a distal end 7a that hermetically passes through the partition wall 3 and opens into the pressure chamber 2, and a rear end thereof that is connected to compressed air supply means such as an air compressor (not shown). The tip of the earth discharge pipe 8 hermetically penetrates the partition wall 3 and opens into the pressure chamber 2, and the rear end (not shown) communicates with the outside.

The propulsion jack 10 has a piston rod 1 at its tip.
01 is fixed to the partition wall 3 via a pin 19, and its rear end is fixed to the reaction wall 9 via a pin 2o. In addition,
In this embodiment, one propulsion jack 10 is provided on each side of the leading installation pipe 4, as shown in FIG.

The reaction wall body 9 applies a reaction force to the propulsion jack 10 to support it when the propulsion jack 10 is operated, and applies a predetermined pressing force to the bulkhead 3 to propel the propulsion tube 1 integrated therewith forward. The clamp mechanism 11 is integrally fixed to the outer surface of the clamp mechanism 11.

The clamp mechanism 11 includes a first jack 22.
Second jack 23. and a pair of wedge bodies 24 and 25 are arranged. In this embodiment, the wedge body 24 is fixed to the outer casing 21, and the wedge body 25 facing the wedge body 25 is installed so as to be slidable in the axial direction. The surface has been processed to reduce resistance. The first jack 22 and the second jack 23 are arranged at the warped rear end of the front roof of the outer H21 so that the tips of the L-shaped pistons 221 and 231 can press the front and rear surfaces of the wedge body 25. There is. In the non-embodiment, the clamp mechanisms 11 are disposed symmetrically above and below the leading installation pipe 4.

Further, in this embodiment, a first tube is provided at the tip of the high-pressure water pipe 5.
The sprocket 26 is installed, and the leading installation pipe 4 at the corresponding position
It is connected to a second sprocket 27 mounted on the outer periphery by an endless chain 28, and prevents mud from adhering to the area around the leading installation pipe 4 and entering the pressure chamber through the gap between the leading installation pipe 4 and the guide pipe 14. A scratching plate 29 for scraping is attached.

Next, the operation of the tube propulsion device according to this embodiment will be explained.

When the propulsion tube 1 is propelled to the position shown in FIG. 1 by the self-propulsion effect described later, the excavated soil 13 pushed into the pressure chamber 2 of the propulsion tube 1 due to the propulsion is moved through the nozzle 6. which is rotated by the motor 17. The high-pressure jet water jetted from 6 sequentially cuts and crushes the material into a conical shape as shown in the figure.

The crushed soil is forced into the earth discharge pipe 8 which opens into the pressure chamber 2 by the action of high pressure air that is forced into the pressure chamber 2 from the air pipe 7, and is forced out by decapitating an appropriate collection point outside.

In addition, the water content ratio of the crushed soil by the jet water from the nozzle 6 increases by only several tenths of a factor compared to the water content ratio of the natural ground being propelled, and the crushed soil does not change into a muddy state. The work of feeding compressed air into the earth removal pipe 8 and transporting it to the ground can be easily done.

While cutting and discharging a predetermined amount of the excavated soil 13 in the pressure chamber 2, the propulsion jack 10 is operated, and a predetermined reaction force is applied from the reaction wall body 9, so that the bi'stone rod 101 moves toward the partition wall 3. The propulsion tube 1 integrated with the propulsion tube 1, as shown in FIG. 4, accurately propels itself a predetermined distance in the target direction along the leading installation tube using the guide tube 14 as a guide.

Incidentally, when the propulsion jack 10 operates as described above, in this embodiment, the second jack 23 of the clamp device 11 operates in conjunction, pressing the wedge body 25 forward in the figure, and by the action with the upper wedge body 24. A pair of wedge bodies 25 connect to the leading installation pipe 4 from the upper and lower surfaces.
The rear end of the propulsion jack 10 is clamped and a predetermined reaction force is applied to the stress from the propulsion jack 10 transmitted from the reaction wall 9 by the friction force 1 with the abutting surface of the wedge body 25. support.

After the propulsion pipe 1 has self-propelled to the position shown in FIG. By retracting the rod to the original position, the propulsion jack 10 and the clamp mechanism 11 return to the original position relationship shown in FIG.

Thereafter, by repeating the above steps, the propulsion pipe 1 self-propels while excavating and discharging the ground in front, and the subsequent main pipe connected to the rear end of the propulsion pipe 1 moves forward in conjunction with the propulsion pipe 1. There is no need to press fit the main pipe from the rear as in the past, and there is no problem even if the main pipe is made of a somewhat fragile material.

Note that there is no problem even if there is only one nozzle 6, and at least two or more propulsion jacks 10 may be arranged in a well-balanced manner.

As for the jack in the clamp mechanism 11, if the L-shaped piston of one jack is fixed to the structure 25 and can move forward and backward, the other jack may be omitted.

In the present invention configured as described above, since the propulsion tube itself has a self-propulsion function, there is no need for means for press-fitting the succeeding main tube, and the main tube is fully compressed. Since it does not have bones, it can be used even with relatively weak parts, reducing costs.

In addition, the work of transporting the excavated soil that is pushed into the pipe as the propulsion pipe is propelled can be done extremely efficiently and easily, reducing work time and, by extension, reducing work costs. It has various useful effects.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention; FIG. 1 is a longitudinal conceptual diagram showing an outline of a tubular propulsion device; FIGS. 2 and 3 are A in FIG. 1, - A schematic cross-sectional view along the A line and the B-B line, and FIG. 4 is a conceptual diagram showing a state in which the propulsion tube is self-propelled.D... Tube propulsion device, 1... Propulsion tube, 2... Pressure Chamber, 3... Partition wall, 4... Leading installation pipe, 5... High pressure water pipe, 6... Nozzle, 7... Air pipe, 8... Earth discharge pipe,
9... Reaction wall plate, 10... Propulsion jack, 11.・
Clamp mechanism.

Claims (1)

[Claims] A propulsion tube with a cutting edge at the tip, a pressure chamber formed in the front part of the propulsion tube into which excavated soil is pushed in as the propulsion tube advances, and a partition wall that separates the rear part of the pressure chamber from the rear. A leading installation pipe is installed in the ground in front of the propulsion pipe in a lagging manner along the direction of propulsion, and a lead installation pipe is installed in the pressure chamber so as to be able to rotate around itself in the axial direction, and is pushed into the pressure chamber. A nozzle that injects high-pressure fine jet water to crush the excavated soil, an air pipe that supplies compressed air for carrying out the crushed soil into the pressure chamber, and an exhaust pipe that pneumatically transports the crushed soil in the pressure chamber using the compressed air. a propulsion jack disposed between the earthen pipe, the bulkhead and a reaction wall provided behind the bulkhead, and propels the propulsion tube integral with the propulsion tube forward via the bulkhead; A clamp mechanism is provided, which fixes the reaction wall body to the leading installation pipe only when the propulsion jack is activated, and is movable relative to the leading installation pipe when the propulsion jack is not activated. Tube propulsion device.