JPH0339154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a compaction hydraulic propulsion method for small-diameter pipes that enables excavation and propulsion without any trouble even in soils with highly fluid water-retaining sand layers.

Conventional technology: To lay relatively small-diameter pipes, excavation methods using augers have been widely adopted in place of the conventional open-ditch burial method, and the construction methods and propulsion equipment required for this installation have already been developed. Many methods have been developed and are in practical use.

Therefore, when carrying out the construction work for promoting and burying this small diameter pipe,
When the soil is a highly fluid, water-retaining sand layer, too much earth and sand is often taken into the pipe during excavation by the auger, resulting in damage to the ground surface. Therefore, there were many difficulties in burying small diameter pipes in such soil. Therefore, as a means of solving this problem, a horizontal auger is used, and the auger casing is filled with water from inside the mine, so that there is no difference between the water pressure inside the device and the water pressure in the ground at the face. In some cases, the so-called muddy water pressurization method is used, in which the excavated soil is kept as muddy water during excavation, and the excavated soil is pumped out from inside the auger casing using a pump.

However, in this type of system, the water pumped into the casing and the waste soil are mixed by the auger screw, resulting in excessive driving force and large driving energy loss, making it less economical. damage, and often a lack of torque during initial operation due to earth and sand resistance, especially around the auger screw;
Furthermore, since the auger and casing naturally occupy the central portion, there are various problems such as a narrowing of the space available within the propulsion tube.

Purpose of the invention: The present invention solves the problems of the prior art, and
Small-diameter pipes can be used to prevent excessive inflow of earth and sand into the excavated area, prevent the collapse of road surfaces, and enable safe, accurate, and economical excavation and burying even in areas with highly fluid soils such as water-retaining sand layers. The purpose is to provide a propulsion burial method.

Structure of the Invention: In order to achieve the above object, the present invention provides a method for propelling and burying small diameter pipes using a press-in propulsion machine, by providing a leading pipe with a muddy water chamber at the rear of the screw consolidation chamber behind the auger head. The water is circulated through the mud chamber through the propulsion buried pipe and from the waste soil treatment section outside the launch shaft through water pipes and mud discharge pipes. Excavation is carried out while keeping the compaction chamber behind the head in a compacted state, and the excavated soil is sent out from the mud room through a drainage pipe, and the soil is separated from the waste water in the soil disposal section.When excavation is stopped, the auger head is The screw compaction chamber is isolated from the face side by the seal means, and valves in the pipelines are closed to stop the flow of water between the mud chamber, the water supply pipe, and the mud discharge pipe. be.

Embodiment: Hereinafter, one implementation of the construction method of the present invention will be described in detail with reference to the drawings. As shown in FIG. Leading pipe of buried pipe 10
As shown in the second figure, a back-up spring 13 and a rear back-up spring 14 are provided with a steel plate edge ring 1 of required dimensions, a reaction force receiver 12, and a muddy water chamber 15.
A drive shaft 16 is arranged to pass through the shaft center line, and an auger head 17 is attached to the tip of the shaft 16, and a screw blade 18 is appropriately installed at the rear of the auger head 17. A section is attached to this screw blade 18 to attach the casing 1.
9 is fitted to form a screw compaction chamber 20 between the cutting edge ring 11 and the muddy water chamber 15, and the casing 19 is fitted with the front end face plate 13' of the back-up spring 13.
The base end is fixed to the screw blade 18.
A seal plate 21 with a seal gasket 21' attached to the outer periphery is fixed to the front position of the mounting part. A structure is used in which the portion A and the inside of the leading pipe 10 are cut off. The drive shaft 1 of the auger head 17 built into this leading pipe 10
6 is approximately the same length as one propulsion tube, and the shaft joint 4
The rear end is directly connected to the drive section of the press-fit propulsion device 2.

The lower half of the end of the screw casing 19 that opens into the muddy water chamber 15 is provided with a soil overflow regulating plate 22 to prevent the discharged soil from the face from flowing into the muddy water chamber 15 all at once. 20 to keep it in a compressed state.

In addition, a water supply pipe 5 and a mud discharge pipe 6 are installed in the mud chamber 15 at an intermediate position that does not interfere with the rotation of the drive shaft 16 of the auger head 17, and each pipe 5, 6 has an electric on-off valve. These valves V1 and V2 are controlled in the starting shaft 1 so that they are fully open during excavation and fully closed when excavation is stopped. The respective pipes 5 and 6 are connected to the outside through joints in sequence through such electric on-off valves V1 and V2, and are connected to the muddy water treatment tank 7 in the earth removal treatment section installed on the ground at the attachment part of the press-in propulsion machine 2. Connect the pipes 5' and 6' from the
A sludge pump 8 and a water pump 9 are interposed and installed at appropriate positions in the pipes 5' and 6' in the mine or above ground.

Note that the drive shaft 16 is located inside the leading pipe 10 and the propulsion pipe 3.
0, as shown in FIGS. 3 to 5, there is a housing 26 in which a rolling bearing 27 is installed.
However, the shoe 2 is slidable in the front and back direction via a strong coil spring 28 at a circumferential position divided into three equal parts.
9 abuts against the inner surface of the tube, and prevents rolling rotation by a bearing mechanism 25 supported at the center.
To enable accurate power transmission.

Using a device with such a configuration, a press-in propulsion device 2 installed in the starting shaft 1 in a conventionally known manner is used to move the leading pipe 10 and buried pipes in the fume pipe area or other materials to the desired position. is connected as a propulsion tube 30 and propelled by known means. When driving the auger head 17 at the tip face of the leading pipe 10, the drive shaft 16 is moved forward to perform excavation with the auger head 17 protruding from the cutting end as shown by the chain line in Figure 2, and at the same time, the water supply is carried out. pump 9
and electric on-off valves V1, V provided in each pipe 5, 6 which drives the mud removal pump 8 and which connects to the muddy water chamber 15.
2 is opened, and the excavated soil is sent to the mud room 15 through the consolidation chamber 20, and mixed with water to the mud drain pipe 6.
The same amount of circulating water is sent to the mud chamber 15 to maintain a balance against the earth pressure acting from the ground side inside the consolidation chamber 20. Then, the auger head 17 is rotated to continue digging, and the earth and sand are successively discharged. The waste water is sent into the above-ground mud water treatment tank 7 by the waste water pump, where the sand is sedimented and separated, and the supernatant water is sent to the waste water chamber 15 by the water supply pump 9 as circulating water. Perform the operation to send it to.

When the press-fitting for one propulsion tube is completed, the rotation of the auger head 17 is stopped and the auger head 17 is moved backward, and the sealing plate 21 is brought into contact with the end of the casing 19 of the consolidation chamber 20, thereby sealing the face part A and the inside of the leading tube 10. Then, the supply of circulating water is stopped, valves V1 and V2 are closed, and then the propulsion pipe is added. Of course, at this point, the water in both the feed and discharge pipes is drained once, the propulsion pipe and drive shaft are connected to each piping, etc., and then the next propulsion work is started, repeating this as many times as necessary to carry out the burial work. That's what I do.

The drive shaft 16 of the auger head 17 is axially supported by the bearing mechanism 25 as described above, and the shoe 29 can be easily moved along the pipe wall when inserted into the pipe 30. Therefore, assembly can be performed easily.

Effects of the invention: As described above, according to the construction method of the present invention, when carrying out propulsion excavation, there is no need for an auger or casing over the entire length as in the conventional construction method, and it is possible to excavate with a single drive shaft, and the rest is a water pipe. It can be prepared by simply connecting the piping with the sludge water pipe and the conventional long auger is not required, so the driving torque is reduced, the power cost is significantly reduced, and the length of one span of the propulsion method can be reduced. The pipe can be made longer for work, and the inside of the pipe can be used more widely, so the propulsion accuracy, which is an important role during propulsion, can be improved, and the equipment used can be reduced because a casing and auger are not required. This allows the installation of small-diameter pipes to be carried out rationally by solving the problems associated with high-water retention sand layers.

[Brief explanation of the drawing]

The drawings show one embodiment of the construction method of the present invention, in which Fig. 1 is an overall schematic diagram, and Fig. 2 is a longitudinal cross-sectional view of the leading pipe section, showing how the positions of the water supply and sludge drainage pipes are displaced. FIG. 3 is a diagram showing the bearing mechanism of the drive shaft in the leading tube, FIG. 4 is a detailed view of the shaft support part in the propulsion tube, and FIG. 5 is a view taken from FIG. 4. 1... Starting shaft, 2... Press-fit propulsion machine, 5, 5'... Water supply piping, 6, 6'... Sludge water piping, 7... Mud water treatment tank, 8... Sludge water pump, 9... Water supply pump, 10
...Leading pipe, 11...Blade ring, 12...Reaction force receiver,
13, 14...Backup spring, 15...Muddy water chamber, 16...Drive shaft, 17...Auger head, 18
...Screw blade, 19...Screw casing, 20...Consolidation chamber, 21...Seal plate, 22...Sediment overflow adjustment plate, 25...Bearing mechanism, 30...Propulsion pipe, V
1, V2...Electric valve.

Claims (1)

[Claims] 1. In a construction method in which small-diameter pipes are propelled and buried using a press-fit propulsion machine, a lead pipe is provided with a muddy water chamber at the rear of the screw consolidation chamber behind the auger head, and the inside of the propulsion construction pipe is inserted into the muddy water chamber. Afterwards, water pipes and mud drain pipes are installed from the soil disposal section outside the starting shaft to circulate water. During excavation, water is sent through the water pipes and the consolidation chamber behind the auger head is kept in a compacted state. The excavated soil is sent out from the mud chamber through a drainage pipe, and the soil is separated from the mud water in the soil treatment section.When the excavation is stopped, the auger head is moved back and the screw is removed by a sealing means. A small-diameter pipe propulsion method characterized in that the consolidation chamber is isolated from the face side, and the flow of water is stopped by closing valves in the pipelines between the muddy water chamber, the water supply pipe, and the muddy drainage pipe. Construction method.