JPH0415046B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" This invention is mainly used to break large-diameter pipes that are brittle against shearing forces, such as cast iron water mains (large and medium diameter) buried underground. The present invention relates to a method and a device for breaking the same.

``Prior art and problems to be solved by the invention'' Conventionally, when excavating and removing a relatively large-diameter water pipe buried underground, the entire circumference of the pipe was removed. Methods such as cutting a pipe, cutting a part and driving a wedge from the outside to break the crack, or using a hydraulic crusher to break the pipe are used. When lifting and removing the pipe, it is necessary to excavate the entire periphery of the pipe to expose the entire circumference, which has the drawback of requiring a great deal of labor. Since they were also broken manually, they also had the disadvantage of being labor-intensive.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention has the following features:
By drilling a long hole along the circumferential direction in a part of the tube body and applying pressure in the relative direction by engaging wedges oppositely to the inner and outer edges of this long hole, the portion of the tube body around the long hole is crushed. At the same time, a crack is created from the end of the long hole around the entire circumference of the pipe, making it possible to mechanically rupture the entire circumference of the pipe, such as cast iron pipes buried underground, without having to excavate the entire surrounding area. At the same time, it was possible to hook the lifting arm of a crane or other device to the largely fractured part around the long hole and lift and remove the pipe body, which was partially buried underground. This paper proposes a pipe breaking method and a breaking device.

``Example'' Below, the present invention will be described with reference to an example shown in the drawings.The pipe body S to which this invention is applied is a large-diameter cast iron pipe or synthetic resin pipe that is relatively brittle against shearing force. It may be an exposed tube, but
This is particularly effective for pipes buried underground that need to be excavated and removed, so the case of buried pipes will be described below.

First, a support body 1 constituting the breaking device of the present invention is suspended from a lifting arm 3 of a lifting cable 2 of a lifting device such as a tow truck or a crane truck, and a pair of left and right tension rods 4, 4 and between them are suspended. Compression rods 5 are provided which are arranged parallel to each other in left and right directions.

The tension rod 4 is rotatably suspended from the support body 1 by engaging an enlarged diameter recess 6 at its enlarged diameter proximal end 4', and is integrally provided with a wedge plate 7 that widens in the distal direction at its distal end. There is.

The compression rod 5 is configured to extend and contract up and down as a telescopic rod of a hydraulic jack 8 whose base end is fixed to the support body 1, and a wedge 9 tapering in the distal direction is integrally provided at its distal end.

When breaking a pipe body S such as a cast iron pipe buried underground using the breaking device configured as described above, first, the ground above the pipe body S is excavated, and the upper surface of the pipe body S is broken. A long hole 10 having a width slightly larger than the wall thickness of the wedge plate 7 is formed along the circumferential direction by cutting or fusing a part of the hole.

Next, the support body 1 is suspended over the elongated hole 10 of the tubular body S, and the wedge plates 7 at the tips of the tension rods 4 are inserted into the elongated hole 10 parallel to the wedge plates 7, and in this state, the tension rods 4 are inserted. is rotated by 90 degrees so that the end-widening direction of the wedge plate 7 is perpendicular to the longitudinal direction of the elongated hole 10. In this state, the compression rod 5 is expanded by the expansion operation of the hydraulic jack 8, and the tip of the wedge 9 at the tip thereof is expanded. is inserted into the elongated hole 10.

With the wedge plate 7 and the wedge 9 engaged with each other facing inside and outside the elongated hole 10, the hydraulic jack 8 is extended and the compression rod 5 is extended to press the wedge 9 at the tip into the elongated hole 10. This reaction force applies a tensile force to the tension rods 4, 4, and the wedge plate 7 at the tip is inserted into the elongated hole 1.
Press fit into 0.

By applying relative axial forces to the rods 4 and 5 in this way, the wedge plate and the wedge 9 are pushed into the elongated hole 10 from the inside and outside of the tube body S, and the elongated hole 10 is pushed into the elongated hole 10 by both of them. While pushing out the long hole 10 of the tube S.
As a result of applying shearing force to the surrounding area of the elongated hole 10
The peripheral portion of the tube body 1 is sheared and fractured, and at the same time, a crack 11 is generated along the circumferential direction of the tube body 1 from the end of the elongated hole 10, and the tube body 1 is fractured.

Then, a lifting hand 3 such as a crane is hooked to the opening 12 created in the upper part of the tube S by crushing the area around the elongated hole 10, and the tube S, whose lower part is still buried in the earth and sand, is lifted up. Remove.

In the illustrated embodiment, the compression rod 5 is operated by a hydraulic jack 8, but in contrast, the tension rod 4, which can rotate the wedge plate 7 at its tip, is operated by a hydraulic jack. , it may be configured such that an axial force is applied to the compression rod 5 by the reaction force.

``Effects of the Invention'' As described above, according to the present invention, the tips of the tension rod and the compression rod apply axial forces in opposite directions to the inner and outer peripheries of the elongated hole formed along the circumferential direction in a part of the tube. engaging the wedge plates and wedges provided in the opposite manner,
By press-fitting both wedges into the elongated hole from the inside and outside of the tube, the portion of the tube around the elongated hole is sheared and fractured, and at the same time, a crack is created from the end of the elongated hole to the entire circumference of the tube, thereby causing underground damage. It is possible to mechanically break the entire circumference of a cast iron pipe buried in a hole without excavating the entire circumference of the pipe, and it can also be used to hook a lifting hand such as a crane into the large fractured opening around the long hole. , the pipe body whose lower part is buried underground can be lifted up as it is and removed without requiring excavation around the entire circumference.

In addition, since the tension rod is rotatably attached to the support, the wedge plate at the tip of the rod is inserted into the elongated hole in parallel with it, and by rotating in this state, it is perpendicular to the elongated hole. can be engaged.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing the installed state of the breaking device of the present invention, Fig. 2 is a longitudinal sectional side view of the compression rod portion, and Fig. 3 is a longitudinal sectional side view of the tension rod portion.
FIG. 4 is a plan view showing how the wedge is engaged with a long hole provided in the tubular body, and FIG. 5 is a plan view showing the tubular body in a broken state. 1... Support body, 2... Lifting cable, 3... Hanging hand, 4...
Tension rod, 4'... Expanded diameter proximal end, 5... Compression rod,
6... Diameter expansion recess, 7... Wedge plate, 8... Hydraulic jack, 9
...Wedge, 10...Long hole, 11...Crack, 12...Opening, S
...Tube body.

Claims (1)

[Scope of Claims] 1. A long hole is formed in a part of the tube along its circumferential direction, and a wedge plate provided at the tip of the tension rod that widens toward the tip is inserted into the long hole. is rotated perpendicularly to the elongated hole to engage the inner peripheral edge of the elongated hole on the inner circumferential side of the tube body, and a compression rod provided at the tip of the compression rod in the elongated hole A tapered wedge is inserted from the outer circumferential side of the tubular body, and a tensile force is applied to the tension rod and a compressive force is applied to the compression rod, thereby crushing the peripheral portion of the long hole of the tubular body, A method for fracturing a tube, the method comprising creating a crack in the circumferential direction of the tube from the end of the elongated hole. 2. A rotatable tension rod having a wedge plate at its tip that widens in the distal direction and a compression rod having a wedge tapering in the distal direction at the tip are installed parallel to the left and right on the support body, and the tension rod and the compression rod are opposite to each other. A pipe body breaking device characterized in that a hydraulic jack that applies an axial force in the direction is installed on the support body.