JPH0255597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propulsion method for excavating and advancing a cylindrical body underground, and to a method for constructing a reaction force receiver for launching the cylindrical body.

[Conventional technology]

Conventionally, in the propulsion method, a cylindrical body is installed in a launching hole and the cylindrical body is excavated into the ground from this launching hole and advanced. The reaction wall is used to move the cylinder forward using a propulsion jack.

[Problem to be solved by the invention]

However, this reaction wall is fixed, and as the cylinder advances, the distance between the cylinder and the reaction wall increases, and spacers must be added one after another between the propulsion jack and the cylinder. The drawback was that the book was only used for propulsion for medium-sized short cylinders with a length of 2 to 4 meters at most.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional propulsion method and to provide an excellent method for constructing a movable reaction force receiver developed to enable the advancement of a large and extended cylindrical body. be.

[Means to solve the problem]

In order to achieve the above object, the present invention relates to a method for installing a cylindrical body in a launch hole and building a reaction force receiver for horizontally advancing the cylindrical body underground. A small tunnel-shaped horizontal hole with a penetrating end having a cross section that partially protrudes outward from the bottom and side surfaces of the lower part of both sides in the cross section of the body is formed facing forward from the starting hole and extending for an appropriate length in the ground, A cable is inserted into the overhanging part of the horizontal hole, the front end of the cable is fixed with a fixing material, and concrete is poured into this overhanging part to start the underground reaction force body that fixes the front part of the cable. The main idea is that the cable is constructed at the lower part in front of the hole, and the rear part of the cable is extended to the rear of the cylinder of the launch hole and removably fixed via a fixing device to a movable reaction force receiving member arranged at the rear of the cylinder. It is something.

〔Example〕

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

In Figure 1, 1 is a concrete cylinder;
This is installed inside a launch hole that will be described later as a launch base.

On the outside of the bottom outer surface 2 and the side outer surface 3 of the cylinder 1,
A small tunnel-shaped horizontal hole 4 that partially projects is formed toward the front of the starting hole 5.

This horizontal hole 4 has an overhanging bottom part 2' and an overhanging side surface 3' as an overhanging part 4', and faces in the forward direction of the cylinder 1 and extends only a required length l halfway through the cylinder body, not over the entire extension L. After excavation, it is formed as a small tunnel that passes through the tunnel.

Next, the overhanging portion 4' in the horizontal hole 4 passing through the end
The cable 6 as a connecting member using PC steel wire etc.
is inserted, concrete is poured into this overhanging portion 4', and the front portion of the cable 6 protruding from the concrete pouring portion is fixed with a fixing member 7.

In this way, the cable 6 is fixed with concrete, and this concreted part is constructed as the underground reaction force body 8.

On the other hand, the rear part of the cable 6 is a starting platform 5' in the starting hole 5.
A horizontal bar-shaped movable reaction force receiving member 9 that extends rearward of the upper cylinder 1 and is provided at the rear of the rear cylinder of the cylinder 1.
It is removably fixed with a fixing device 10.

This fixation is performed by directly or indirectly attaching and gripping the cable 6 to the movable reaction force receiving member 9.

Further, the underground reaction force body 8 made of concrete may be integrally connected to the starting platform 5' also made of concrete.

Furthermore, if the key 12 is provided protrudingly below the underground reaction body 8 and the starting platform 5', it is possible to further increase the underground frictional force.

In order to advance the cylinder 1 in this way, a propulsion jack is interposed between the movable reaction force receiving member 9 attached to the cable 6 by the fixing device 10 and the cylinder 1, and the cable 6 is moved forward. The reaction force of propulsion is taken by the underground reaction force body 8 through the underground reaction force body 8, the one-stroke cylinder body 1 of the propulsion jack is propelled, the piston stroke of the propulsion jack is returned, the fixing device 10 is released, and together with the movable reaction force receiving member 9. Moving it forward, fixing the cable 6 to the movable reaction force receiving member 9 again using the fixing device 10, and taking the reaction force to the movable reaction force receiving member 9 using the propulsion jack to propel the cylindrical body are repeated.

In addition, as another method, as shown in the figure, a hollow jack (or a traction device that operates similarly to a hollow jack) in which the cable 6 inserted through the movable reaction force receiving member 9 is attached and interposed behind the movable reaction force receiving member 9 is also available. ) 11 penetrates the inner hole and indirectly fixes the front part with a removable fixing tool 10, and a movable reaction force receiving member 9 is attached to the rear part of the cylinder body 1.
are brought into close contact with each other, and by operating and extending the hollow jack 11, the movable reaction force receiving member 9 is advanced via the cable 6 which takes a reaction force to the underground reaction force body 8, and the cylinder body 1 is simultaneously advanced. .

〔Effect of the invention〕

As described above, the method for constructing a reaction force receiver for launching a cylinder is a method in which a cylinder is installed in a launch hole and a reaction force receiver for horizontally advancing the cylinder into the ground is constructed. It is excellent as follows.

1 The movable reaction force receiving member moves forward by the amount of forward movement as the cylinder moves forward, so each time the cylinder moves forward, as in the conventional propulsion method, the hem of the spacer is used to fill the gap between the jack and the cylinder. Since no attachment is required, the heavy press member and the time and effort of repeatedly removing the hem are omitted, making it highly economical and shortening the construction period.

2. As mentioned above, since a spacer is not required, this method can advance a long distance forward even with a single cylinder with a large extension, and is not limited by the extension of one cylinder as in conventional propulsion methods.

3. Either the movable reaction force receiving member is in close contact with the rear of the cylinder and moves forward together with the cylinder, or there is only a propulsion jack between the movable reaction force receiving member and the cylinder, which is necessary for conventional propulsion methods. Since there is no need to add or extend a spacer, there is no danger of the presser member springing out, etc., and the construction period is shortened at low cost.

4. Since there is contact between the underground reaction force body and the outer surface of the bottom of the cylinder and the outer surface of the side, it is necessary to correctly guide the vertical slope and left and right direction of the cylinder to keep the direction of the cylinder correct from the initial start of the cylinder. It helps to correctly guide the direction after orientation, greatly benefits accuracy and shortens construction time, and saves the effort of direction correction, making it highly economical.

As explained above, the method of the present invention eliminates the spacer required in conventional propulsion methods, is highly accurate in directional gradient, is safe, technologically efficient, and economical, and is not propelled by conventional propulsion methods. This technology has the great technical advantage of eliminating the restriction on the length of a single cylinder and allowing the length of a single cylinder to be used forward even if the cylinder length is many times the length of the cylinder used in conventional propulsion methods. There is an advantage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the method of constructing a reaction force receiver for starting a cylinder according to the present invention, FIG. 2 is a longitudinal sectional side view of the same, and FIG. 3 is a plan view of the same. DESCRIPTION OF SYMBOLS 1... Cylindrical body, 2... Bottom outer surface, 2'... Bottom surface of overhang, 3... Side outer surface, 3'... Side surface of overhang, 4... Horizontal hole, 4'... Overhang, 5... …
Launching hole, 5'... Starting platform, 6... Cable, 7... Fixing material, 8... Underground reaction force body, 9... Movable reaction force receiving member, 10... Fixture, 11... Medium hole jack, 1
2...Key.

Claims (1)

[Claims] 1 Regarding the method of installing a cylinder in a launch hole and building a reaction force receiver for horizontally advancing this cylinder into the ground, A small, penetrating tunnel-like horizontal hole with a cross section that partially overhangs outward from the bottom and side surfaces is formed facing forward from the starting hole and extends to an appropriate length in the ground, and a cable is installed in the overhanging portion of the horizontal hole. Insert the cable, fix the front end of the cable with a fixing material, and place concrete on this overhanging part to construct an underground reaction force body at the lower front of the launch hole to fix the front part of the cable. A reaction force receiver for starting a cylinder whose rear part extends toward the rear of the cylinder in the starting hole and is detachably fixed to a movable reaction force receiving member disposed at the rear of the cylinder via a fixing device. Construction method.