JPS621074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for burying pipe bodies such as vinyl chloride pipes and surface-coated gas pipes underground.

Conventionally, a known method for burying pipe bodies is to press the pipe bodies directly into the ground, but since vinyl chloride pipes are weak against axial loads, they cannot be buried using the above-mentioned method, so gas pipes with surface coatings are used. In this case, the coating layer will peel off, so it cannot be buried using the above-mentioned method.

For this reason, in order to bury vinyl chloride pipes and gas pipes with surface coating, it is necessary to use the full-scale excavation and backfilling method, or to press a highly rigid pipe body such as a humid pipe directly into the ground in advance, and to The pipes are buried using the sheath pipe construction method, etc.

However, the complete closure and backfilling method causes traffic congestion,
This method has disadvantages in that it is undesirable because it tends to cause construction pollution such as damage to houses, and the sheath pipe construction method has disadvantages in that it requires burying an extra tube with high rigidity, resulting in high costs.

The present invention was made in view of the above circumstances, and its purpose is to provide a pipe burying method that allows pipes with weak axial loads and pipes with surface coating to be buried at low cost without causing construction pollution. It is to be.

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

First, as shown in Figs. 1a, b, c, and d, a plurality of pilot pipes 1 are bolted from the starting shaft A toward the destination shaft B by the propulsion jack 3, guided by the pilot head 2 equipped with the ability to correct the direction. Then, they will be press-fitted and buried in sequence.

Next, if the diameter of the pilot tube 1 is smaller than the diameter of the tube to be buried, a plurality of large diameter The second pilot pipe 4 of the same diameter is sequentially press-fitted and buried while tightening the bolts.

That is, as shown in Fig. 2 a, b, c, and d, the screw conveyor 5 is charged into the pilot pipe 1, and the second pilot pipe 4 is sequentially press-in and propelled from the hole A using the excavation head 6 as a guide. Set up At this time, the earth and sand excavated by the excavation head 6 is transported to the reaching shaft B by the screw conveyor 5.

Further, as shown in FIGS. 3a, b, c, and d, the second pilot pipes 4 are successively press-fitted and buried using the multistage consolidation head 7 as a guide.

In addition, the pilot tube 1 and the second pilot tube 4
As shown in FIG. 4, upper and lower injection pipes 8, 8 are formed extending in the axial direction, and flanges 9, 9 for tightening bolts are formed at both ends.

Next, as shown in Fig. 5, the pipe 10 to be buried inside the pilot pipes 1 and 4 buried in advance is press-fitted by the propulsion cylinder 3 from the starting shaft A, and the wire of the winch 11 installed in the arrival shaft B is inserted. At 12, pull in and lay the cable.

After that, as shown in FIG. 6, the pilot tube 1,
4 is returned to the starting shaft A side, a backfilling agent 13 such as mortar or bentonite is jetted out from the tips of the injection pipes 8, 8, and sequentially injected and filled into the annular gap 14 between the buried pipe 10 and the ground.

As a result, the pipe 1 to be buried as shown in FIG.
The pipe 10 is buried in the ground with a backing agent 13 filled in the axial direction between the outer peripheral surface of the pipe 10 and the ground.

As described above, since the entire surface is not excavated and backfilled, construction pollution such as traffic congestion and damage to houses is not caused, and since no large axial load is applied to the buried pipe 10, the axial direction of vinyl chloride, etc. Even pipes with a weak load can be buried, and even buried pipes 10
Since a large press-fit driving force is not required when installing the cable, the coating agent coated on the outer circumferential surface will not peel off.

Further, since the pilot pipes 1 and 4 are pulled back, they can be reused without being buried underground, resulting in lower costs.

As described above, the present invention allows pipes with a weak axial load or pipes coated with an outer surface coating material to be buried underground without causing construction pollution, and the pilot pipes 1 and 4 can be buried underground. Since it can be reused without being buried, the cost is reduced.

Furthermore, while the buried pipe 10 is kept stationary and the pilot pipes 1 and 4 are pulled back, the annular gap 14 between the ground and the buried pipe 10 is filled with the backfilling agent 13 through the pair of injection pipes 8, 8. Since the buried pipe 10 and the ground do not move, the annular gap 14 is uniformly and smoothly filled with the backing agent 13 over the entire length of the buried pipe 10 in the longitudinal direction. Since the outer peripheral surface of 10 does not move relative to the backfilling agent 13 that has already been injected and filled, it is not damaged by the backfilling agent 13.

In addition, a backfilling agent 13 is added from a pair of injection pipes 8, 8.
Since two different types of backing agents can be injected, the curing time can be changed arbitrarily, and the range of application is widened.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of embedding a pilot pipe, FIG.
The figure is an explanatory diagram of burying the large-diameter second pilot pipe.
The figure is a perspective view of the pilot pipe, and FIGS. 5, 6, and 7 are explanatory views of the buried pipe. 1 and 4 are pilot pipes, 10 is a buried pipe, 13 is a backfilling agent, 14 is an annular cavity, A is a starting shaft, and B is a reaching shaft.

Claims (1)

[Claims] 1 After the pilot pipes 1, 4 having a pair of injection pipes 8, 8 on the outer periphery over the entire length in the longitudinal direction are press-fitted and buried underground, the pilot pipes 1, 4 are
The buried pipe 10 is laid over its entire length, and then, while pulling the pilot pipes 1 and 4 back from underground, a backfilling agent is injected into the annular gap 14 between the buried pipe 10 and the ground from the pair of injection pipes 8 and 8. A pipe burying method in which a buried pipe 10 is buried underground by injecting and filling 13.