JP3926429B2 - Method for removing underground objects and apparatus used for the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for quickly removing a hollow underground buried object such as a buried housing or a manhole in a short time.
[0002]
[Prior art]
Old manholes and inspection enclosures buried under roads and the like are damaged by the load of passing vehicles, the effects of groundwater, and frost heaving in cold regions. Furthermore, in order to eliminate the level difference generated on the paved road surface, it is necessary to remove and replace these underground objects.
[0003]
Conventionally, the pavement surface is cut into squares with a cutter and removed, and the earth and sand around the underground buried object is excavated and removed, and the underground buried object is exposed and removed to replace it with a new one. It was. Since this conventional construction method requires cutting of the paved road surface, excavation of the surrounding ground, and earth retaining, it took 2-3 days to complete the removal and replacement work of the underground buried object.
[0004]
[Problems to be solved by the invention]
In the conventional underground excavation removal and replacement method, paving road surface cutting, earth and sand removal, as well as the removal of underground buried objects, and the period of time during which traffic is restricted are relatively long, hindering smooth traffic.
[0005]
Therefore, the present invention aims to overcome this drawback, remove and replace underground objects in a short time, and make the road occupation period as short as possible.
[0006]
[Means for Solving the Problems]
The paved road surface around the underground object is cut into a circle, the reaction force frame is installed on the underground object, and the reaction force frame is used to cause a shear failure in the ground surrounding the underground object. In addition, the underground buried object can be removed in a short time by pulling up the underground buried object integrally. State More specifically, pulling the underground installations are to utilize center hole jack installed in the reaction force frame, and the engaging member provided at the tip of a rod inserted through the center hole jack engaged in underground installations By pulling up, the shear ground breakage is generated in the surrounding ground of the underground buried object, and the underground buried object and the cut paved road surface around it are integrally lifted.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The removal method will be described based on the embodiment of FIG. This embodiment is an example of removal and replacement of an inspection casing for earth E provided on a steel pipe P such as a gas pipe. The casing is placed on a donut-shaped base B installed in the ground.
[0008]
First, the center position of a housing | casing is calculated | required and the paved road surface 10 is cut | disconnected so that a circular cutter (not shown) may be match | combined with the center position of the underground embedding object 1, and the housing | casing of the underground embedding object 1 may be wrapped.
[0009]
A reaction force frame 2 for removing the underground buried object 1 is set on the paved road surface 10 cut with a circular cutter. The legs 21 of the reaction force frame 2 are installed outside the paved road surface cutting part . The legs 21 of the reaction force frame 2 transmit the force for lifting the underground buried object 1 to the road surface, and determine the cross-sectional area and number of the legs 21 in consideration of the ground contact area so that excessive pressure is not applied to the paved road surface 10. . A center hole jack 3 is installed and fixed at the center of the reaction force frame 2.
[0010]
A rod 4 having an engagement tool 41 that engages with the underground object 1 at the tip is inserted into the center hole jack 3. A coupler 43 is provided so that the rod 4 can be connected and extended so as to correspond to the buried depth of the underground buried object 1.
[0011]
At the tip of the rod 4, an engagement tool 41 that engages the underground buried object 1 from the inside of the underground buried object 1 is provided. For example, engaging member 41 that match engaged with taut on the inner wall of the underground buried object 1. The engaging tool 41 is rotatably attached to the tip of the rod 4 as shown in FIG. 2, and the end of the engaging tool 41 has a long side on the lower side and a short upper side so as to meet the inclination of the inner wall. It has a trapezoidal cross section. A deformable material such as rubber is affixed to the engagement surface 42 so that the engagement surface 42 is in close contact with the inner wall. The engaging tool 41 is rotated to be parallel to the rod 4 and inserted into the underground object 1, and the engaging tool 41 is rotated 90 degrees so as to be orthogonal to the rod 4.
[0012]
The engaging tool 41 orthogonal to the rod 4 is slightly raised so that both end portions of the engaging tool 41 come into contact with the inner wall of the underground object 1, and the rod 4 is moved up and down so that the underground object 1 can be pulled up in a balanced manner. Adjust the contact position.
[0013]
If it is confirmed that the engaging surface 42 of the engaging tool 41 is in contact with the underground object 1, the center hole jack 3 is operated and the underground object 1 is pulled up. The lifting force of the center hole jack is transmitted to the inner wall of the underground object 1 through the rod 4 and the engaging tool 41, and the underground object 1 is pulled up. When the underground buried object 1 is pulled up, the surrounding ground 11 is also lifted together, so that shear fracture occurs in the ground 11 around the underground buried object 1 below the pavement surface 10 . The pavement surface 10 because it is cut by a circular cutter, as the fracture surface of the line connecting the lower end and the lower end of the underground installations 1 circular cut portion of the pavement surface 10, as shown by the broken line in FIG. 1, for example, a circular cutting portion the surrounding ground 11, between the underground installations 1 are shear failure, underground installations 1 and cut pavement surface 10 around its raised together, underground installations 1 are removed.
[0014]
If there is necessary, subjected to earth retaining performs such further drilling down.
[0015]
As other structures of the engagement tool 41, there are a structure in which a radial arm like a reverse umbrella is provided at the tip of a rod so as to be openable and closable, and a structure in which a hydraulic cylinder extends and contracts to the left and right. Moreover, even if the hydraulic cylinders are arranged in a cross shape, for example , the rods are connected by a universal joint, etc., even if the inserted rod does not coincide with the center of the underground object, the lifting force of the center hole jack is well balanced. To be communicated to. Unlike the mechanical engagement tool shown in FIG. 2, the engagement tool using the hydraulic cylinder has a frictional force required to lift the underground object with the pressing force of the hydraulic cylinder even if the inner wall of the underground object is vertical. Can be obtained.
[0016]
【The invention's effect】
Cutting the paved road surface with a circular cutter and removing the paved road surface and underground buried object by shearing and destroying the surrounding ground when pulling up the underground buried object using the reaction force frame, speeds up the construction, and the underground buried object Removal and replacement work can be completed in a short time, and the time for occupying the road and restricting traffic can be shortened. The engaging tool using the hydraulic cylinder can obtain the frictional force necessary for pulling up the underground object with the pressing force of the hydraulic cylinder even if the inner wall of the underground object is vertical.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining the removal of underground objects.
FIG. 2 is an explanatory diagram of an embodiment of an engagement tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground object 10 Pavement surface 11 Surrounding ground 2 Reaction force frame 21 Leg 3 Center hole jack 4 Rod 41 Engagement tool 43 Coupler B Base E Earth P Steel pipe

Claims (1)

  Cut the paved road surface around the underground buried object into a circle, and install the reaction frame leg placed above the underground buried object on the paved road surface outside the circular cut part. With the center hole jack provided on the reaction force frame in a state of engaging the underground buried object, the engagement tool is pulled up to cause a shear fracture in the ground between the underground buried object and the circular cut portion, A method of removing an underground buried object and the underground buried object by integrally pulling up the cut pavement surface around it.

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