JPH0358040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves excavating a working shaft underground, installing a propulsion machine inside the working shaft, and moving a leading propulsion pipe inserted into the working shaft in the longitudinal direction of the working shaft using the propelling machine. Insert a large number of trailing propulsion tubes one after another into the working tunnel, and with the propulsion tubes in communication and contact with the previously pushed propulsion tubes, push them in the same direction as the leading propulsion tube using the propulsion machine. This paper relates to improvements in the method of punching out pipes to form underground pipes.

Conventionally, as shown in FIG. 12, leading and trailing propulsion pipes 2a and 2b are immediately inserted into the ground from a working shaft 1a.
was pushed into the work shaft 1a by the propulsion device 4, and with the rear ends of these thrust pipes 2a and 2b protruding into the work shaft 1a, the thrust pipe 2b to be pushed next was set. However, the propulsion tube 2 that should be pushed next
The length L' of the working shaft 1a in the pushing direction of the propulsion pipes 2a, 2b must be secured to be greater than the length l of b plus the width l' for installing the propulsion unit 4. A working pit 1a with a length L' of approximately 4 to 5 m was excavated. This has the disadvantage that it is impossible or difficult to carry out in places where it is difficult to secure a large construction area, such as in urban areas, or where there are many underground structures. Further, since the volume of the working pit 1a becomes considerably large, the amount of excavated soil and backfilling soil to be handled increases, resulting in a disadvantage that a large amount of expense is required for excavation and disposal of the soil.

The purpose of the present invention is to
The purpose of this invention is to enable the excavation and formation of a working shaft in a state where the length in the thrusting direction of the propulsion pipe is small, and to reduce the amount of earth and sand handled.

The characteristic means of the pipe punching method according to the present invention is that, before inserting the leading propulsion tube into a working shaft excavated underground, the propulsion tube is inserted into the propulsion tube to form a space for insertion of the propulsion tube or for installation of the propulsion device. A cylindrical body shorter than When setting it on the aircraft, the front end of the propulsion tube is inserted into the cylindrical body, or the propulsion unit is installed inside the cylindrical body, and the effects are as follows. .

In other words, when excavating and forming the working hole 1a, the second
As shown in the figure, the excavation length L in the direction of pushing the propulsion pipe
However, the length L' is sufficient to set the propulsion device 4 and the short cylindrical body 6, and is considerably smaller than the length L' when the propulsion device 4 and the long propulsion tube 2b shown in FIG. 12 are set.

When pushing the propulsion tubes 2a, 2b underground from inside the working shaft 1a, the front ends of the propulsion tubes 2a, 2b are inserted into the cylindrical body 6, as shown in FIGS. 5 and 9. Or, as shown in FIG. 11, the propulsion device 4 is inserted into the cylindrical body 6 and the working shaft 1a
Even though the excavation length L is small, the propulsion tubes 2a and 2b are set in a predetermined manner with respect to the propulsion device 4 and pushed into the ground.

Therefore, even in places where it is difficult to excavate and form a work shaft 1a with a large length L, such as in urban areas or places with many underground objects, it is now possible to construct the work shaft 1a satisfactorily. By reducing the excavation volume and the amount of earth and sand handled, construction costs can now be significantly reduced.

Next, examples will be shown.

As shown in FIG. 1, on both sides of the location where the pipe is to be buried, there are first and second shaft-shaped working shafts 1a,
1b is excavated and formed, and the excavation length L in the propulsion pipe pushing direction of the first working shaft 1a is made slightly larger than the length l of the propulsion pipe 2, and as described later, in the first working shaft 1a. The dimensions of the cylindrical body 6 are set to be sufficient to set it in the propulsion device 4.

As shown in Figure 2, the earth retaining wall 5 is made of steel etc.
is formed in the first working shaft 1a, and the propulsion jack key 4
A, a propulsion device 4 having a back concrete 4b and a guide 4c is installed in the first working shaft 1a, and a cylindrical body 6 having a diameter shorter and larger than the propulsion pipe 2 and equipped with a cutting edge 6a is installed.
is placed on the guide 4c (see Fig. 8), and the cylindrical body 6 is moved along the longitudinal direction of the first working shaft 1a from the opening 8 of the retaining wall 5 to the second working shaft 1b using the propulsion device 4 and the spacer 7. As shown in Fig. 4, the cylindrical body 6 is set so as not to protrude too much into the first working shaft 1a, and the earth and sand inside the cylindrical body 6 are removed manually or with an appropriate device. Then, the cutting blade 9 is fitted into the small diameter portion 6b of the cylindrical body 6 on the cutting blade side.

As shown in FIG. 5, after inserting the leading propulsion tube 2a into the first working shaft 1a from the position indicated by the chain line into the large diameter portion 6c of the cylindrical body 6 as shown by the dotted line, the jack key 4a As shown in the solid line, the carriage 10 is placed on the guide 4c, and as shown in FIG. 4c
The propulsion tube 2a is centered with respect to the cylindrical cutting blade 9 fitted in the cylindrical body 6 by the action of the pedestal 11 set above and curved along the cylindrical body 6. , the truck 10 is pushed by the propulsion device 4, and the propulsion tube 2a
The front end side is inserted into the cylindrical body 6 and fitted into the cutting blade 9, and as shown in FIG. 7, a spacer 7 is inserted between the propulsion tube 2a and the jack key 4a.

By reciprocating the jack key 4a multiple times and increasing the number of spacers 7 installed, the propulsion tube 2a is moved to the second position.
It is pushed into the ground toward the working shaft 1b, and as shown in FIG. The soil is removed by an appropriate means such as flowing into the first working pit 1a with water or using a soil removal screw.

As shown in FIG. 9, a large number of subsequent propulsion pipes 2b
are sequentially put into the first working shaft 1a, inserted into the cylindrical body 6, and placed on the trolley 10 in the same way as the leading propulsion pipe 2a described above. The underground propulsion tubes 2a and 2b are all pushed into the second tube, with the subsequent propulsion tube 2b being in communication contact with the previously pushed propulsion tube 2a or 2b. As shown in FIG. 10, a pipeline 12 extending from the first working shaft 1a to the second working shaft 1b is formed underground by the propulsion pipes 2a and 2b, and 1
The cart 10, pedestal 11, and cutting blade 9 are collected at a and 1b.

Finally, the short conduit is pushed into the conduit 12 by the propulsion device 4, and the front and rear conduits are welded together in a communicating state within the first working shaft 1a, extending from the first working shaft 1a to the second working shaft 1b. A pipeline is formed, the cylindrical body 6 is recovered from the first working hole 1a, and the first
and connecting an above-ground lead-out pipe to the pipeline in the second working shaft 1a, 1b, or connecting the pipeline to an existing or newly constructed conduit whose one end side faces the first working shaft 1a or the second working shaft 1b, etc. Appropriate measures are taken to backfill the first and second working pits 1a and 1b.

Next, another example will be described.

The working shafts 1a and 1b may be horizontal shafts formed on a slope, for example, and when pushing the propulsion pipes 2a and 2b toward the ground surface such as a slope, one working shaft is required. It is only necessary to excavate and form 1a.

The specific configuration of the propulsion device 4 includes, for example, propulsion pipes 2a, 2
The propulsion tubes 2a and 2b can be changed as appropriate, such as by making them rotatable.For example, appropriate propulsion tubes 2a and 2b, such as hume tubes or steel tubes, can be used.

The leading propulsion tube 2a may be formed into a type with a fixed cutting edge 9 and recovered, in which case the following propulsion tube 2b
May be shorter.

When installing a conduit within the conduit 12, the propulsion pipe 2
The space between a, 2b and the conduit may be filled with sand or the like using a water or air flow, and the conduit 12 may be used, for example, for passing cables or for other purposes.

The cylindrical body 6 is inserted into the working hole 1 as shown in FIG.
Even if the propulsion pipes 2a, 2b are pushed into the ground from a to the opposite side to the pushing direction, and the propulsion device 4 is inserted into the cylindrical body 6 and installed, the excavation length L of the working shaft 1a can be similarly determined. Can be made smaller.

The cylindrical body 6 can be appropriately changed in shape, structure, material, etc., and may be left underground.

Furthermore, it can be applied to existing punching methods such as a horizontal auger starting shaft and a horizontal rotary cutter propulsion method, and both can reduce the excavation length in the pipe propulsion direction in the excavation formation of the working shaft 1a.

[Brief explanation of drawings]

FIGS. 1 to 10 are explanatory diagrams of work procedures in an embodiment of the present invention. FIG. 11 is an explanatory diagram of another embodiment of the present invention. FIG. 12 is an explanatory diagram of a conventional example. 1a... Working pit, 2a, 2b... Propulsion tube, 4... Propulsion machine, 6... Cylindrical body.

Claims (1)

[Claims] 1. A working shaft 1a is excavated underground, a propulsion device 4 is installed in the working shaft 1a, and the leading propulsion pipe 2a inserted into the working shaft 1a is moved in the longitudinal direction of the working shaft 1a by the driving device 4. and sequentially put a large number of subsequent propulsion pipes 2b into the working hole 1a,
In a state where the propulsion tube 2a or 2b pushed in earlier is in communication contact with the propulsion tube 2a or 2b, the propulsion device 4 pushes it in the same direction as the leading propulsion tube 2a, and the propulsion tube 2a, 2b
In this method, the leading propulsion pipe 2a is inserted into the working shaft 1.
Before inserting into the propulsion tubes 2a and 2b, a cylindrical body 6 shorter than the propulsion tubes 2a and 2b is inserted into the propulsion tubes 2a and 2b to form a space for inserting the propulsion tubes 2a and 2b or for installing the propulsion device 4. The thruster 4 pushes the thruster 4 into the ground in the pushing direction or the opposite direction, removes the earth and sand inside the pushed cylindrical body 6, and moves the thruster tubes 2a and 2b toward the thruster 4. When setting the propulsion device 4, the front ends of the propulsion tubes 2a and 2b are inserted into the cylindrical body 6, or the propulsion device 4 is
A pipe punching method in which the pipe is inserted into the cylindrical body 6 and installed.