JPH039997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for correcting deviation in a propulsion method, and particularly relates to a method for correcting deviation in a propulsion method in which a pipe is buried while being pushed into soft ground.

[Background of the invention]

Conventionally, a pipe propulsion device has a leading pipe at the tip of the pipe to be inserted into the ground, and a movable tip (shu) equipped with a sew operating mechanism at the tip of the leading tube, and excavation is carried out in front of the tip. A dirt removal auger is placed inside the pipe, and the auger pushes the pipe forward while removing soil. If the tube deviates from the intended direction of propulsion, a movable blade provided at the tip of the leading tube is operated to correct the tube to the intended direction of propulsion.

In addition, normally in this type of propulsion method, the deviation is corrected by looking through a target provided at the tip of the pipe from the transit in the pit, but the deviation of the leading pipe is so great that it becomes impossible to measure the amount of deviation from the transit. In case of deviation, the following deviation correction method is used. That is, in the propulsion method described in Japanese Patent Application Laid-open No. 57-40093, when the propulsion direction deviates from the planned course, the screw auger is reversed and the earth and sand in the casing are compacted and backfilled, and the auger is pulled back together with the buried pipe. , a pipe burying method has been disclosed in which the direction of the lead pipe is corrected after it has been brought to its normal position and the lead pipe is re-propelled. However, in this pipe burying method, the earth and sand in the excavated casing is backfilled in a consolidated form, so in soft ground, for example, the earth and sand may not become consolidated despite the reverse drive of the screw auger. Alternatively, even if a soil improvement material such as mortar is injected from the tip of the screw auger and mixed with the soil in the casing, the soil in the casing may have an adverse effect on soil hardening depending on the stratum, or may spread over a wide area. There is a risk that it will harden too much and become impossible to propel.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and is a method for correcting deviation of pipes even in soft strata, etc. in a pipe burying method in which the pipes are buried while being pushed underground. The purpose of this study is to propose a method for correcting deviation of pipe burying method.

[Summary of the invention]

In order to achieve the above object, the present invention provides a shoe capable of correcting deviation in the leading pipe at the tip of the pipe, arranges a casing pipe inside the pipe following the leading pipe, and has a screw inside the casing pipe. In the propulsion method of burying a pipe while inserting a screw auger and pushing the pipe while discharging excavated earth and sand with a screw auger, if the leading pipe deviates by more than a predetermined amount, the screw auger will rotate in the normal direction. After discharging the excavated earth and sand from inside the casing pipe, while reversing the screw auger, aggregate is poured into the casing pipe using sand, gravel, etc. that is harder than the excavated earth, and the deviated excavation hole is compacted and filled with aggregate. It is characterized by pulling back the leading pipe to the position before deviation while returning it, and from the pulled back position, rotate the screw auger in the normal direction and dig again.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for correcting deviation in propulsion construction according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, an earth auger type tube propulsion device is shown. In Figure 1, Pit 10
Inside is a base 12, a slide base 14 for pipe propulsion
is located. Pipe propulsion slide base 14
can be moved left and right on the base 12 by the action of the hydraulic cylinder 18. The front end 15 of the slide base 14 supports the buried pipe 22, and as the slide base 14 moves, the buried pipe 22
is pushed forward. Further, a drive device 27 consisting of a motor 24 and a reduction gear device 22 is arranged on the slide base 14, and the rotational force of this motor 24 is transmitted to the drive device 2.
The auger 28 connected to the rotor 7 is rotated. An inner tube 30 located outside the auger 28 is supported by the slide base 14. Therefore, when the slide base 14 moves, the buried pipe 22, auger 28, and inner tube 30 move in the left-right direction as the slide base 14 moves.

A bit 34 is provided at the tip of the auger 28, and a shoe operating mechanism 36 is provided at the leading tube 35 at the tip of the buried tube 22.

A target 38 is provided behind the leading pipe 35, and this target 38 is connected to the buried pipe 22 and the inner pipe 3 by a transit 40 arranged in the pit 10.
You can check its position by looking between it and 0,
The amount of deviation of the buried pipe 22 can be measured. Other measuring means such as a laser and a gyroscope can be used to measure the deviation.

As shown in FIG. 1, a bit shaft 42 is provided at the tip of the shaft of the auger 28 via a joint 41, and an auger bit 34 is provided on this bit shaft 42. Furthermore, a shoe (movable cutting edge) 23 is provided at the tip of the buried pipe 22 so as to be swingable via a joint 23A. A shoe operating mechanism 36 is arranged behind the shoe 23. The shoe actuation mechanism 36 is provided with cylinders 48 and 50. The cylinders 48 and 50 are configured to be able to protrude and retract freely in the axial direction of the buried pipe 22, and have the function of tilting the shoe 23 in any direction by protruding.

The operation of the tube propulsion device constructed as described above is as follows. First, in a normal pipe pushing operation, as shown in FIG. 1, the tube 23 is excavated and pushed while being held horizontally. As the slide base 14 moves, the bit 34, buried pipe 22, and leading pipe 35 move to the first position.
They are pushed integrally to the left in the figure.

If it is determined that the path of the buried pipe 22 deviates from the plan based on the amount of deviation detected by the transit 40, the cylinders 48 and 50 are actuated, and the shoe 23 is accordingly inclined. . Continue to propel in this state, transit 40
The deflection can be corrected by monitoring the target 38 from the ground.

Next, when it becomes difficult to measure the target 38 by the transit 42 because the amount of deviation becomes too large as shown in FIG. 2, the following deviation correction method is performed. That is, as shown in FIG.
8 is out of sight of the transit 40, making it difficult to measure the target 38, the auger 2
8 in the forward direction to discharge the excavated earth and sand in the inner pipe 30. Next, while reversing the auger 28, instead of the excavated earth and sand, aggregates such as sand and gravel, which are harder than the earth and sand, are thrown into the deviated excavation hole 52. This state is shown in FIG. 3, and in this case, earth and sand made of aggregate that is easily hardened by compaction is used. New aggregate is introduced and the excavated hole 52 is backfilled with consolidation, while the shoe 23 is pulled back to its normal position before deviation. In this case, mortar may be injected from the tip of the bit 34 if necessary.
When the deviated hole 52 is compacted and backfilled with new earth and sand and inserted as shown in Fig. 3, the auger 28 is rotated in the normal direction to excavate from the normal position before the deviation as shown in Fig. 4. At the same time, the deviation correction mechanism is operated, the deviation is monitored by the transit 40, and the buried pipe 22 can be inserted in the planned pushing direction.

〔Effect of the invention〕

As explained above, according to the deviation correction method of the propulsion method according to the present invention, when the tip of the pipe deviates by a predetermined amount or more, the screw auger rotates normally to discharge the earth and sand in the casing pipe, and then While reversing the screw auger, another aggregate is thrown in, backfilled for compaction, and the lead pipe is pulled back to its normal position for excavation, making it easy to backfill and harden the deviated hole and correct the deviation of the buried pipe. Easy and sure.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a propulsion device used in the deviation correction method of the propulsion method according to the present invention, and FIGS. 2 to 4 are drawings showing the deviation correction method of the propulsion method according to the present invention. FIG. 2 is an explanatory diagram showing a deviated state, FIG. 3 is an explanatory diagram showing a state in which the deviated excavation hole is backfilled, and FIG. 4 is an explanatory diagram showing re-excavation. 22... Buried pipe, 23... Shu, 27... Drive device, 28... Auger, 30... Inner pipe, 34...
...bit, 35...leading tube, 36...shew operating mechanism, 38...target, 40...transit.

Claims (1)

[Claims] 1. Provide a shoe that can correct deviation in the leading pipe at the tip of the pipe, place a casing pipe inside the pipe following the leading pipe, insert a screw auger into the inside of the casing pipe, and excavate with the screw auger. In the propulsion method of burying a pipe while discharging earth and sand while pushing the pipe, if the leading pipe deviates by more than a predetermined amount, the screw auger rotates forward to discharge the excavated earth and sand inside the casing pipe.
While reversing the screw auger, aggregates such as sand and gravel that are harder than the excavated earth and sand are put into the casing pipe, and the deviated excavation hole is consolidated and backfilled with aggregate, and the leading pipe is returned to the position before the deviation. A method for correcting deviation in a propulsion method, which is characterized by pulling back, rotating the screw auger in the normal direction from the pulled back position, and digging again.