JPH058319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water stoppage method for a pipe burying propulsion device for burying sewer pipes, gas pipes, and cable insertion pipes underground.

[Conventional technology]

An apparatus shown in FIG. 5 is used for such pipe burying work.

In the figure, 1 and 1' are buried pipes such as hume pipes, and 2 is a leading pipe installed at the tip of the pipe.A blade 3 with a triangular box-shaped cross section whose direction can be adjusted by a cylinder 4 is loosely fitted at the leading end of the leading pipe 2. do.

A steel pipe casing 5 was inserted into the leading pipe 2 and the buried pipes 1, 1', .

8 in the figure is a base placed in the vertical hole 7 on the starting side.
A support frame 10 is provided on the base 8 and is moved forward and backward by a propulsion jack 9, and a motor 1 is attached to this support frame 10.
1a and a drive device 11 consisting of a speed reducer 11b is attached, and the screw auger 6 is attached to this drive device 11.
while connecting the ends of the screws 6b and supporting frame 1.
0, the buried pipes 1, 1'... and the rear end of the casing 5 are connected.

In this way, when the screw 6b is rotated by the drive device 11, the excavation head 6a at the tip also rotates to excavate the ground in front of the cutting edge 3. The excavated earth and sand is carried rearward within the casing 5 by the screw 6b and is discharged through the earth discharge port 12 of the support frame 10.

At the same time, if the propulsion jack 9 is extended and the support frame 10 is moved forward on the base 8 while taking a rearward reaction force, the buried pipe 1 and the leading pipe 2 are moved forward. Once the first buried pipe 1 is pushed underground, the support frame 1
0 is retracted, the next buried pipe 1' is connected to that space via the coupler 13, and the casing 5 is
The screws 6b and 6b are also added and extended, and the same process is repeated, after which the buried pipes at the later stage are successively joined in tandem and advanced to the required length.

Midway direction correction is done by changing the direction of the cutting edge 3 using the cylinder 4, and inserting the leading pipe 2 into the reaching hole (not shown).
When this is reached, the other equipment is removed leaving the buried pipes 1, 1', . . . and the construction is completed.

[Problem to be solved by the invention]

If the apparatus shown in FIG. 5 is used, pipe installation work can be carried out without excavating from the ground surface, and there will be no injury to traffic or the like. However, if the ground is soft, such as a water-retaining gravel layer, a large amount of water will enter the device through the blade opening 3. This water is present with the earth and sand when the device is running, and disposal is relatively easy. However, if the screw 6b is stopped when connecting the buried pipes 1, 1'..., only water flows, making disposal difficult. .

As a countermeasure, as shown in Fig. 6, the excavation head 6a is formed in the shape of a plug for the cutting edge 3, and when adding a buried pipe, by pulling the screw 6b slightly backward, the excavating head 6a is connected to the cutting edge 3. It is practiced to make contact at the inner part to act as a water stop valve.

However, with this method, water is stopped only at the front end of the device, and the flow of water that has already entered the casing cannot be suppressed. Also,
If inclusions such as pebbles enter between the cutting edge 3 and the excavation head 6a, the water-stopping effect will be impaired.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional disadvantages and to provide a water stoppage method in a pipe burying propulsion method that can effectively stop water at the rear part of the casing.

[Means to solve the problem]

In order to achieve the above object, the present invention has a double pipe structure by inserting a casing into a buried pipe to be constructed and a leading pipe with a cutting edge attached to the front end thereof, and inserting an auger screw into the casing. The digging head of the auger is placed in the cutting hole, and the screw and the digging head are rotated by the driving device, and the screw and the digging head are rotated by the driving device to drive the screw and the buried pipe. If the ground is excavated and the excavated earth is carried backwards inside the casing using a screw and discharged, and at the same time the buried pipe and the lead pipe are advanced by the buried pipe propulsion device, and the first buried pipe is propelled into the ground, In the pipe burial promotion method, the next buried pipe is joined to the rear end, the casing and screw are also added and extended, the same process is repeated, and the subsequent buried pipes are successively joined in tandem and pushed to the required length. , install air nozzles facing inward and forward in the circumferential direction of each casing to be connected sequentially or any desired casing with an appropriate corner, so that when adding a buried pipe, the cutting head is shielded by the excavation head and the air nozzle is The gist of this system is to use a nozzle to eject air from a predetermined location of the casing toward the inside and front, and use this air pressure to prevent the flow of water within the casing.

[Effect]

According to the present invention, the flow of water is prevented by the jet pressure of air, and no water-stopping member is provided protruding from the inner surface of the casing, so that it does not interfere with the rotation of the screw. By shutting off the water at the rear of the casing, water that has already entered the casing can also be retained.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway side view of a pipe buried propulsion device for carrying out the construction method of the present invention, FIG. 2 is a vertical side view of the main part, and FIG. 3 is a sectional view taken along the line A--A in FIG. 1.

By the way, the underground pipe propulsion construction method using the underground pipe propulsion device is almost the same as the conventional example shown in FIG.

In the present invention, air nozzles 14 are provided at necessary locations on the casing 5 of the underground pipe propulsion device in the underground pipe propulsion method shown in FIG. 5, for example near the rear end of each casing 5, facing inward and forward.

One to several air nozzles 14 are disposed at appropriate intervals in the circumferential direction of the casing 5 so as to penetrate from the outside to the inside. and is connected to an air supply source 16 on the ground.

Note that the air nozzle 14 may not be provided in all the casings 5, but only in an arbitrary one.

On the other hand, the digging head 6a has a rear circumferential surface shaped so that it can be attached to the inner circumferential surface of the deep part of the cutting edge 3, and the screw head 6a
The excavation head 6a is constructed so that it becomes a plug when the excavation head 6a is slightly pulled backward.

Next, the water stopping method of the present invention using such a device will be explained.

In press-fitting the buried pipe, when the screw 6b is rotated by the drive device 11, the excavation head 6a at the tip also rotates to excavate the ground in front of the cutting edge 3. The excavated earth and sand is transported rearward in the casing 5 by the screw 6b and discharged from the earth discharge port 12 of the support frame 10, and at the same time, the propulsion jack 9 is extended to take the reaction force backward while supporting the support frame 10 as a base. 8, the buried pipe 1 and the leading pipe 2 move forward, as in the conventional construction method.

Once the buried pipe is driven underground in this manner, the next buried pipe is joined to its rear end via the coupler 13, as shown in FIG. When adding this buried pipe, air nozzle 1
4 to the inside front of the casing 5.

As a result, this air hits the water accumulated in the casing 5, and the air pressure can prevent the water from flowing out to the rear.

Further, if necessary, the screw 6b can be pulled back a little to cover the cutting edge 3 with the excavating head 6a.

In this way, new water from the outside can be prevented from flowing into the casing 5 at the back of the blade mouth 3, and the amount of water that is blocked by the air pressure is only the amount that has already entered the casing 5. nothing.

〔Effect of the invention〕

As described above, the water stopping method in the pipe burial promotion method of the present invention is such that a casing is inserted into the buried pipe to be constructed and a leading pipe with a cutting edge attached to the front end to form a double pipe structure. A buried pipe propulsion device includes a screw of an auger inserted into the hole, a digging head of the auger placed in the cutting edge, and a drive device for the screw and a propulsion device for the buried pipe at the rear. The earth is rotated to excavate the ground in front of the cutting edge, and the excavated soil is carried backwards inside the casing with a screw and discharged.At the same time, the buried pipe and the leading pipe are moved forward by the buried pipe propulsion device, and the first buried pipe is moved forward. Once it is propelled into the ground, the next buried pipe is joined to its rear end, and the casing and screw are also added and extended, and the same process is repeated, and the subsequent buried pipes are successively joined in tandem. In the underground pipe propulsion method that advances the required length, it is possible to stop the water that has entered the casing midway through the casing from flowing out, which would cause the water in the casing to flow into the vertical hole on the starting side and interfere with the work. There will be no more. Furthermore, since it uses an intangible substance called air, there is no protrusion inside the casing unlike when water is stopped using a sealing material or the like, so there is no risk of impeding the movement of the screw.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view of a pipe buried propulsion device used in the pipe buried propulsion method of the present invention, Figure 2 is a longitudinal cross-sectional side view of the main parts of the same, and Figure 3 is A of Figure 1. - A cross-sectional view, FIG. 4 is 1 of the method of the present invention.
FIG. 5 is a partially cutaway side view showing the entire conventional buried pipe propulsion device; FIG.
The figure is a longitudinal sectional side view of the main parts of the same. 1, 1'... Buried pipe, 2... Leading pipe, 3... Blade mouth, 4... Cylinder, 5... Casing, 6...
Screw auger, 6a...Drilling head, 6b...
...screw, 7...vertical hole, 8...base, 9...
Propulsion jack, 10... Support frame, 11... Drive device, 11a... Motor, 11b... Speed reducer, 12
... soil discharge port, 13 ... coupler, 14 ... air nozzle, 15 ... air pipe, 16 ... air supply source.

Claims (1)

[Claims] 1. A casing is inserted into the buried pipe to be constructed and a leading pipe with a cutting edge attached to the front end to form a double pipe structure, and the screw of the auger is inserted into the casing, and the excavation head of the auger is inserted into the cutting edge. The buried pipe propulsion device is equipped with a screw drive device and a buried pipe propulsion device at the rear, and the screw and excavation head are rotated by the drive device to excavate the ground in front of the cutting edge and remove the excavated earth and sand. The inside of the casing is carried backwards by the screw and discharged, and at the same time the buried pipe and the leading pipe are advanced by the buried pipe propulsion device, and once the first buried pipe is propelled underground, the next buried pipe is connected to the rear end. In addition, in the pipe burying method, in which casings and screws are added and extended, the same process is repeated, and subsequent buried pipes are connected sequentially in tandem and pushed to the required length, each casing to be connected sequentially or at appropriate intervals is used. An air nozzle is provided that points inward and forward in the circumferential direction at a desired point on the casing, and when adding a buried pipe, the cutting head is shielded by the cutting head, and the air nozzle is used to direct the inside and forward direction from the desired point of the casing. A water stop method in the pipe buried propulsion method that is characterized by blowing air towards the target and using this air pressure to prevent the flow of water within the casing.