JPH0438279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for laying a buried pipe of a desired diameter underground using an excavator and a temporary pipe.

(Prior art and its problems) Traditionally, as a method of burying small diameter pipes used for sewage pipes, etc. underground, the method of burying small diameter pipes used for sewage pipes, etc. is to move from the starting shaft to the arrival shaft side with an excavator of the same diameter as the pipe. One method is to excavate the ground and use an excavator to press the pipe, and the other is to use an excavator that has approximately the same diameter as the pipe to be buried and follow it with a temporary pipe of the same diameter to lay a series of temporary pipes between the shafts. Thereafter, a method has been adopted in which a predetermined buried pipe such as a fume pipe is sequentially advanced to follow the last temporary pipe to replace the temporary pipe and the buried pipe.

The latter method uses temporary pipes, so construction management is easier than the former method.
Also, although it has the advantage of being able to adequately control the quality of buried pipes, the farther downstream a sewer pipe goes, the larger the diameter of the pipe is required, and for this reason, it is necessary to drill a large number of holes at predetermined intervals in the sewer pipe. The diameter of the buried pipe is made different between the manholes. For this reason, the diameters of the excavators and temporary pipes used to lay such buried pipes must be changed each time, and various types of excavators and temporary pipes are used to suit the various diameters of the pipes. Therefore, there were problems such as requiring a great deal of work and high maintenance and equipment costs.

The present invention solves these problems and provides a method for laying buried pipes that allows excavators and temporary pipes to be used as they are even if the outside diameter of the buried pipes is different. be.

(Means for Solving the Problems) In order to achieve the above object, the buried pipe laying method according to the present invention uses an excavator that can excavate the injection pipe to a diameter larger than the outside diameter of the temporary pipe and the buried pipe. Excavating from the starting shaft side to the reaching shaft while sequentially connecting the internal temporary pipes, and during the excavation, lubricant is supplied at a predetermined pressure from the starting shaft side to the injection pipe in the temporary pipe to fill the temporary pipe at the frontmost part. The lubricant is injected between the temporary pipe and the excavated ground from the injection pipe of the pipe, and after the temporary pipe has been laid from the starting shaft to the arrival shaft, an adapter is connected to the last temporary pipe and the lubricant is inserted through this adapter. The buried pipes are connected in sequence and pushed forward, and during the pushing, a backfilling material containing cement is inserted between the buried pipe and the excavated ground from the injection hole provided in the adapter from the shaft side through the injection pipe in the temporary pipe. The feature is that the temporary pipe and the buried pipe are replaced by injection and pushing of the buried pipe.

(Operation) If the outside diameter of the temporary pipe is larger than the outside diameter of the buried pipe, use an excavator that can excavate to a diameter larger than the temporary pipe, and then lay the temporary pipe between the vertical shafts, and then This method replaces the temporary pipe with the buried pipe by sequentially connecting and pressing the buried pipe to the temporary pipe.

In addition, if the outside diameter of the temporary pipe is smaller than the outside diameter of the buried pipe, excavate to a diameter larger than the outside diameter of the buried pipe, lay the subsequent temporary pipe between the shafts, and then install the temporary pipe and the buried pipe in the same way as above. A series of buried pipes will be installed between the shafts to replace the existing pipes.

In this method of laying underground pipes, when installing temporary pipes between vertical shafts, lubricant is injected between the outer periphery of the temporary pipes and the excavated ground to prevent the ground from collapsing. When replacing a buried pipe, a backing material containing cement is injected between the outer periphery of the buried pipe and the excavated ground to replace the slipping material and fix the buried pipe underground.

(Example) To explain an example of the present invention with reference to the drawings, 1
is an excavator, as shown in Fig. 5, a cutter 3 is rotatably disposed in the front end opening of a cylindrical body 2, and a cylindrical hood 4 is removably fitted around the outer periphery. The cutter 3 is removably attached to a bearing 6a at the center of the partition wall of a short cylinder body 6 having a partition wall 5 at the front end which is detachably inserted into the cylindrical body 2, and the cutter 3 is attached to a bearing 6a at the center of the partition wall. is removably fixed to the outer periphery of the front end of the short cylindrical body 6 with bolts or the like. 7 is a cutter rotation drive mechanism attached to the frame 8 at the rear of the short cylinder 6.

Reference numeral 9 denotes a temporary tube whose outer diameter is approximately the same as the outer diameter of the cylindrical body 2 of the excavator 1, and the internal space of the temporary tube 9 is connected to the mud feeding/discharging pipes 10a and 11a disposed inside the cylindrical body 2. Sludge feeding and discharging pipes 10 and 11 are provided to connect and communicate with each other, and a lubricant injection pipe 12 is provided inside the thick wall. In addition, the temporary pipe 9 is formed of an inner and outer double pipe, and an injection pipe is arranged between the inner and outer pipes, and a screw conveyor for removing sludge is arranged in the inner pipe instead of a sludge transport pipe. Good too.

A burying method using such a temporary pipe 9 and the excavator 1 will be explained in cases where the outside diameter of the buried pipe is smaller than that of the temporary pipe and when the outside diameter is larger than that of the temporary pipe.

(a) When the outside diameter of the temporary pipe is larger than the outside diameter of the buried pipe (see Figures 1 and 2).

The excavator 1 is made to excavate from the starting shaft 13 toward the reaching shaft 14, and a temporary pipe 9 of a predetermined length is connected to the rear end, and the temporary pipe 9 is pushed from the starting shaft 13 through the frame 16 by the propulsion device 15, This pressing operation is repeated while sequentially connecting the parts 9.

The temporary pipes 9, 9 are connected to each other by bolts and bolt holes (not shown) provided on the outer periphery of both ends of the temporary pipe 9, and at this time, the mud feeding and draining pipes 10, 11 and the injection pipe 12 are connected. conduct.

The injection pipe 12 of the rearmost temporary pipe 9 pushed by the propulsion device 15 is connected to the lubricant tank 1 installed on the ground.
The injection pipe 12 of the temporary pipe 9 is connected to the injection pump 18 through the injection pump 18 and is press-fitted into the ground excavated by the excavator 1. Non-sliding material 19
is supplied from the front end of the foremost tracheal tube 9 to the tracheal tube 9.
It is propelled while being injected between the outer circumferential surface of the excavated ground and the excavated ground. In addition, the injection pressure of the slipping material is an appropriate pressure higher than the groundwater pressure in the ground.

The earth and sand excavated by the cutter 3 of the excavator 1 is discharged out of the shaft through the mud discharge pipe 11 by mud water sent from the mud feed pipe 10.

In this way, when the temporary pipe 9 is buried from the starting shaft 13 to the reaching shaft 14, the diameter of the front end is equal to the outer diameter of the temporary pipe 9 on the rear end surface of the temporary pipe 9 on the starting shaft side, as shown in FIG. And the diameter of the rear end is the same as the buried pipe 2.
Adapter 2 with a frusto-conical shape equal to the outer diameter of 0
1, and the inner peripheral surface of the front end of the buried pipe 20 is inserted into the ring part 22 protruding from the rear end of the adapter 21.

The adapter 21 is provided with an injection port 23 that can be connected to the injection tube 12 disposed in the temporary tube 9 and that is open on the outer peripheral surface of the front end. 9 into the reaching shaft 14, the backfilling material 25 in the backfilling material tank 24 installed on the ground is injected from the injection port 23 through the injection pipe 12 provided in the temporary pipe 9 from the reaching shaft 14 side, and the The space created between the outer circumferences of the buried pipes 20 is filled with a backing material 25.

This backfilling material 25 is a self-hardening material mixed with cement or the like, and after injection, it is preferably
A material that hardens in about three days is used.

Prior to burying the buried pipe 20, a packing 26 that presses against the outer peripheral surface of the buried pipe 20 is installed at the entrance on the starting shaft side, so that the injected backfilling material 25 leaks into the starting shaft 13. Never.

When the buried pipe 20 connected to the adapter 21 is buried in this way, the next buried pipe 20 is buried in the same manner as described above while injecting the backing material 25, replacing the temporary pipe 9, and A buried pipe 20 is laid between them.

The buried pipes 20 are connected to each other by appropriate means such as a steel collar ring having a T-shaped cross section.

(b) If the outside diameter of the temporary pipe is smaller than the outside diameter of the buried pipe (see Figures 3 and 4).

First, the cutter attached to the cylindrical body 2 of the excavator 1 is replaced with a cutter 3 having a diameter approximately equal to the outer diameter of the buried pipe 20, and a hood 4 approximately equal to the outer diameter of the buried pipe 20 is attached to the outer periphery of the cylindrical body 2. is fitted,
Furthermore, a packing 27 is attached to the entrance of the starting shaft 13 so as to be in close contact with the outer periphery of the temporary pipe 9.

Thereafter, this excavator 1 is made to dig from the starting shaft 13 side toward the destination shaft 14, and the temporary pipe 9 is sequentially pushed by the propulsion device 15 while connecting the same temporary pipe 9 as in the above embodiment to the rear end. let At this time, the excavated soil is discharged and the slipping material 19 is injected in the same manner as in the previous embodiment, and the slipping material 19 injected between the outer periphery of the temporary pipe 9 and the drilled ground prevents the ground from collapsing. do. The injection pressure of the slipping material 19 is always maintained at a constant pressure to prevent the ground from collapsing.

The temporary pipes 9 connected in series in this way reach the vertical shaft 1
4, a packing 28 is also attached to the entrance on the reaching shaft 14 side, and the slipping material 19 is inserted into the temporary pipe 9.
and the excavated ground to maintain a sealed state with a constant pressure.

Next, a truncated cone-shaped adapter 29 whose front end diameter is equal to the outer diameter of the temporary pipe 9 and whose rear end diameter is equal to the outer diameter of the buried pipe 20 is connected to the rear end of the rearmost temporary pipe 9. do.

The adapter 29 has an injection port 30 that can be connected to the injection pipe 12 disposed in the temporary tube 9, and the injection port 30 is opened to the outer peripheral surface of the adapter 29 via a check valve 31.

A buried pipe 20 having a larger diameter than the temporary pipe 9 is connected subsequent to this adapter 29, and when the buried pipe 20 is pressed by the propulsion device 15 and the temporary pipe 9 is pushed out to the reaching shaft 14. The adapter 29 inserts the backfilling material 25 in the backfilling material tank 24 installed on the ground through the injection pipe 12 provided on the temporary pipe 9 from the side.
Inject from the injection port 30 of the excavated ground and the buried pipe 2.
The space created between the outer peripheries of 0 is filled with backing material 25.

Note that it is desirable to provide a check valve plate 32 on the outer periphery of the small diameter side (temporary pipe side) of the adapter 29 so that it comes into close contact with the excavated ground. Avoid mixing with the lubricant 19 injected.

When the buried pipe 20 connected to the adapter 29 is buried in this way, the next buried pipe 20 is buried in the same manner as described above while injecting the backfilling material 25, and replaces the temporary pipe 9. A buried pipe 20 is laid between them.

In addition, if the buried pipe 20 is propelled and pressed, the lubricant 19 that is pushed out to the reaching shaft side is collected into the backfilling material tank 24 side, and if cement is mixed with this lubricant, it can be used as a self-hardening backfilling material. Can be reused.

(Effect of the invention) As described above, according to the buried pipe laying method of the present invention, when the outside diameter of the buried pipe is different from the outside diameter of the excavator and the temporary pipe, the excavation diameter of the excavator is adjusted accordingly. By changing the diameter, it is possible to bury pipes of several different diameters using the same excavator and temporary pipe, and it is possible to continuously lay pipes that gradually become larger in diameter from upstream to downstream, such as sewer pipes. This allows the pipe burying work to be carried out efficiently and economically.

Furthermore, since the lubricating material and the curable injection material can be applied through the same injection tube disposed within the temporary tube, there is no need for separate piping, and workability is improved.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a simplified longitudinal side view of Example 1 in which a temporary pipe is buried, and FIG. 2 is a simplified longitudinal side view of Example 1 in which a temporary pipe is replaced with a buried pipe. 3 is a simplified vertical side view of Example 2 with the temporary pipe buried; FIG. 4 is a simplified side view of the temporary pipe and buried pipe replaced; FIG. 5 6 is a longitudinal sectional side view of the excavator, and FIG. 6 is a perspective view of its frame body. 1... Excavator, 2... Cylindrical body, 3... Cutter, 4... Hood, 9... Temporary pipe, 12... Slub material injection pipe, 13... Starting shaft, 14... Arrival shaft, 1
5... Propulsion device, 19... Sliding material, 20... Buried pipe, 21, 29... Adapter, 25... Back filling material.

Claims (1)

[Scope of Claims] 1. Excavating from the starting shaft side toward the destination shaft while sequentially connecting temporary pipes with injection pipes inside to an excavator capable of excavating to a diameter larger than the outer diameter of the temporary pipe and buried pipe. During the excavation, a lubricant is supplied at a predetermined pressure from the starting shaft side to the injection pipe in the temporary pipe, and the lubricant is injected from the injection pipe of the foremost temporary pipe between the temporary pipe and the excavated ground, After the temporary pipe has been laid from the starting shaft to the destination shaft, an adapter is connected to the last temporary pipe and the buried pipes are successively connected through this adapter while being pushed. Injecting backing material containing cement between the buried pipe and the excavated ground from the injection port provided on the adapter through the injection pipe inside the pipe, and replacing the temporary pipe and the buried pipe by pushing the buried pipe forward. A buried pipe installation method characterized by: 2. A patent characterized in that the above-mentioned excavator is configured such that cutters of large and small diameters are replaceably attached to the cylindrical body according to the outer diameter of the buried pipe, and a hood is detachably fitted on the outer periphery of the excavator. A method for laying a buried pipe according to claim 1.