JPH05280665A - Direction correcting method when propelling welded steel pipe into ground - Google Patents

Abstract

PURPOSE:To correct a direction without bending a welded steel pipe by connecting dummy pipes between an excavating machine and the welded steel pipe in the point end by forming a connecting part bendable. CONSTITUTION:Dummy pipes D-1, D-2 are interposed between an excavating machine 13 and the first steel pipe A-1. These dummy pipes D-1, D-2 are bendably constituted by giving flexibility to a connecting part therebetween. That is, the first dummy pipe D-1 is mounted to the excavating machine 13, lowered down to a starting pit (a) and advanced by a fixed distance into the ground by a jack 11. Next, the second dummy pipe D-2 is connected and advanced by a fixed distance by the jack 11. Then, the first steel pipe A-1 is connected and advanced by a fixed distance. Further, the second steel pipe is welded and similarly advanced. Thereafter, similar operation is repeated. Even when a line change is generated in this work, the dummy pipes D-1, D-2 are bent therebetween to change a direction and then to only generate bending a little between the dummy pipe D-2 and the steel pipe A-1, and thereafter large bending can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of propelling a welded steel pipe into the soil and correcting the direction of the steel pipe if it deviates from a planned route.

[0002]

2. Description of the Related Art In a so-called propulsion method in which a pipe material 2 having an excavator 1 attached to its tip as shown in FIG. Due to the uniformity, the direction of propulsion may deviate from the planned route. As a method of correcting this direction,
Conventionally, the excavator 1 is configured as a swing type mechanism, and a method of correcting the planned route by utilizing the action of this swing is adopted.

[0003]

However, in the case of the conventional correction method described above, in the case of a fume pipe, there is a margin to bend at this joint portion, and therefore the planned route while bending as shown in FIG. It is possible to correct in the direction. However, when the steel pipe is propelled while welding, since the welded portion has no flexibility to bend, the rigidity of the steel pipe 4 does not change as shown in FIG. It is better than the correction power of 1 and it becomes difficult to correct the direction.

It is an object of the present invention to provide a method for redirecting planned lines in welded steel pipe.

[0005]

The method of correcting the direction when propelling the welded steel pipe according to the present invention into the soil is as follows.

In a method of excavating a starting pit and a reaching pit in a pipe section, welding a steel pipe dropped in the starting pit, and applying a propulsive force from the rear to propel it to the reaching pit, the excavator and the leading pit are connected. A method in which a dummy pipe whose joint has flexibility is joined to the welded steel pipe and the direction of the welded steel pipe is corrected to the planned route by utilizing the bending action of the joint of this dummy pipe.

[0007]

FIG. 1 shows a method for correcting the direction when propelling a welded steel pipe according to the present invention into the soil.

A is a starting shaft, b is a reaching shaft, 10 is a starting base,
11 is a jack, 12 is a push wheel, 13 is an excavator, D-
1, D-2 are dummy pipes, A-1 and A-2 are steel pipes,
It will be constructed in the following procedure.

First, the starting pit a and the reaching pit b are excavated, and the propulsion table 10 and the jack 11 are installed in the starting pit a.
Next, the first dummy pipe (fume pipe) D-1 with the excavator 13 attached to the tip is lowered into the starting pit a, and the jack 11 is used to first propel it into the soil by a certain amount, and then Use the jack 11 behind the second dummy tube D-2 and connect the second dummy tube (Hume tube) D-2 into the starting pit a and connect it behind the first dummy tube D-1. Propulsion pressure is applied to propel a certain amount, then the first steel pipe A-1 is lowered into the start pit a, and it is connected to the rear of the second dummy pipe D-2, and the rear of the first steel pipe A-1. The jack 11 is used to apply propulsion pressure to propel a certain amount, and then the start pit a
The second steel pipe A-2 is lowered into the inside, and the first steel pipe A-1
The front end of the second steel pipe A-2 is welded to the rear end of the second steel pipe A-2, and the jack 11 is used to apply propulsion pressure to the rear of the second steel pipe A-2. Similarly, the third and subsequent steel pipes are welded and propelled. Then, the excavator 13 and the first and second dummy pipes D-1 and D-2 and the first steel pipe A-1.
The excavator 11 and the first and second dummy pipes D-1 and D-2 are removed and collected and reused at the point where the appears in the reaching pit.

In this propulsion process, when the excavator 13 starts to deviate from the planned route, the excavator 13 is operated from inside the starting pit a (by swinging) to correct the direction. When this direction correction is performed, the first and second dummy tubes D-
Bending occurs in the joint portion of 1 and D-2, and the first dummy tubes D-1 and D-2 face the correction direction. As the propulsion further proceeds, bending also occurs between the second dummy pipe D-2 and the first steel pipe A-1, and the bending action at these two positions completes the direction correction in most cases. Of course, at the time of implementation, the bent portion may be provided at one place or at two or more places. The excavator 13 may be attached to the first dummy pipe D-1 at the factory or on the ground.

[0011]

As described above, according to the present invention, when a steel pipe is spliced by welding and propelled, a dummy pipe is connected to the excavator on the leading side of the steel pipe so that the joint portion of the dummy pipe is connected. At, the bending follows the swing of the excavator, and the direction is corrected here. Therefore, even in the case of welded steel pipe, piping can be performed without deviating from the planned route.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a direction correction example in the case of a conventional Hume tube.

FIG. 3 is an explanatory diagram of direction correction in the case of a conventional welded steel pipe.

[Explanation of Codes] a Start pit b Reach pit 10 Start pedestal 11 Jack 12 Push ring 13 Excavator D-1 1st dummy pipe D-2 2nd dummy pipe A-1 1st steel pipe A-2 2nd steel pipe

Claims (1)

[Claims] 1. A method of performing piping by excavating a starting pit and a reaching pit in a piping section, and applying a propulsive force from the rear side while propelling the steel pipe lowered in the starting pit to the reaching pit and excavating the excavator. A method in which a dummy pipe whose joint has flexibility is joined to the leading welded steel pipe, and the welded steel pipe is reoriented to the planned route by utilizing the bending action of the joint of this dummy pipe.