JPH0650099A - Method for filling underground cavity after removal of underground installation - Google Patents

Abstract

PURPOSE:To prevent ground subsidence by filling a cavity from which an underground installation has been removed with a packing material. CONSTITUTION:A plurality of packing injection holes 3 are drilled toward underground installations to be removed and along the underground installations 1 from the ground, and as the underground installations 1 are sequentially extracted, packing material 4 is injected through the packing injection holes 3 into cavities 5 formed after the extraction to fill the cavities 5. The cavities 5 from which the underground installations have been removed are filled with the packing material 4 and so ground subsidence can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of filling an underground cavity with a filler to fill a cavity formed after removing an underground buried object such as a buried pipe.

[0002]

2. Description of the Related Art Conventionally, when removing underground buried objects such as buried pipes and cable sheath pipes buried in the ground, after excavating from the ground surface and removing the underground buried objects, backfilling work is usually performed.
In places where it is not possible to excavate, a boring machine is used to drill a hole from the ground surface to the underground buried object, and chemicals, mortar, etc. are injected into the ground around the underground buried object from this hole to strengthen the ground around the underground buried object. The method of removing the underground buried objects from is adopted.

However, the method of excavating underground buried objects by excavating from the ground surface causes traffic congestion because it has to cut off the traffic and affects other buried pipes. , There is a problem such as subsidence of nearby structures. In addition, the method of removing the underground buried object after strengthening the ground around the underground buried object uses a large amount of chemicals, mortar, etc., which causes a problem of high cost.

In order to improve such a problem, there has been proposed a method in which the underground material is simultaneously withdrawn while the underground material is filled with a filler.

[0005]

However, in any of the methods, the ground around the site where the underground buried material has been removed is loosened because the filling is not completed completely, and if left untouched, it may cause depressions such as roads and ground structures. There are problems such as subsidence and tilting. The present invention has been made to solve the above-mentioned conventional problems, and provides a method for filling an underground cavity that prevents ground subsidence or the like by immediately filling the cavity generated in the removal mark of the underground buried object with a filler. It is intended.

[0006]

In order to achieve the above object, the present invention is directed to an underground buried object to be removed, and a plurality of filler injection holes are drilled from the ground surface along the underground buried object, While sequentially extracting the above-mentioned underground buried object, the filler is injected from the above-mentioned filler injection hole into the cavity formed after the withdrawal to fill the cavity. At the same time as the filling material is injected, a vibration generator is inserted into the cavity through the filling material injection hole to apply vibration to the filling material so that the filling material is compacted.

[0007]

[Operation] By the above-mentioned method, it is possible to prevent the ground from loosening or sinking after the underground buried object is removed because the cavity after the underground buried object is removed can be filled with the compacted filling material. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. Fig. 1 is a plan view of the underground buried object (buried pipe) to be removed from the ground surface. In the figure, 1 is an underground buried object, 2 is a working shaft, and 3 is a filler injection hole drilled from the ground.

In working, first, working shafts 2 are excavated at both ends of the underground buried object 1 to be removed so as to be slightly deeper than the lowermost portion of the underground buried object 1. Next, a plurality of filler injection holes 3 are drilled from the ground surface along the underground buried object 1 at substantially equal intervals.
The depth of these filler injection holes 3 is set so as not to reach the underground buried object 1 as shown in FIG.

In this state, extraction of the underground buried object 1 is started from one of the work shafts 2, and at the same time, the filler 4 is injected from the filler injection hole 3 ₁ closest to the other work shaft 2 as shown in FIG. To do. As a result, the filler injection hole 3 ₁
The filled filler 4 is filled in the cavity 5 from which the underground buried object 1 has been pulled out.

Further, in order to increase the filling rate of the filling material 4, as shown in FIG. 4, the vibration generating device 6 is inserted from the filling material injection hole 3 ₁ so as to reach the inside of the cavity 5. Add. As a result, the filler 4 is compacted and filled in the cavity 5, and a cavity is generated in the filler injection hole 3 ₁ .

The upper filling material 4 drops into this cavity due to the vibration applied to the filling material 4 by the vibration generator 6,
Since it is filled with the filling material 4, loosening of the ground is prevented, and the filling material 4 falling from above is filled up one after another while moving upward, and when it reaches the ground surface, the filling material is injected as shown in FIG. The back filling of the hole 3 ₁ is also completed.

As shown in FIG. 6, the filler 4 is injected from the next filler 3 ₂ as the underground buried object 1 is pulled out.
The filling material 4 is placed in the cavity 5 created by pulling out the underground buried object 1.
7, the vibration generator 6 is also inserted into the filler injection hole 3 ₂ as shown in FIG. 7, to compact the filler 4 filled in the cavity 5 and to fill the filler injection hole 3 ₂ . The material 4 is compacted, and the above operation is repeated until the entire underground buried object 1 is pulled out.

In the state where all the underground buried objects 1 are removed, as shown in FIG. 8, the filler 4 is compacted in all of the cavities 5 and the filler injection holes 3 created by the removal of the underground buried objects 1. Since it is filled in the state, it becomes possible to reliably prevent the ground from loosening and the ground subsidence by removing the underground buried object 1.

The filler 4 used in the above-mentioned filling method may be obtained by simply injecting sand into the filler injection hole 3 with water, and of course other fillers 4 may be used. Further, in the above-mentioned embodiment, the method of filling the cavity 5 formed after removing the underground buried object 1 with the filling material 4 has been described. However, in the case of filling the cavity with the face collapsed during construction by the propulsion method, the filling material is filled. Is also applicable. In addition, it is of course applicable to the case where the buried pipe that has been buried until now is unavoidably pulled out and recovered during construction by the propulsion method.

[0016]

As described above in detail, the present invention extracts the underground buried object to be removed, and at the same time, the filler is injected into the cavity formed by the removal through the filler injection hole at the same time as the withdrawal. Since it was compacted by applying vibration, the ground will not loosen even if the underground buried object is removed. As a result, the road collapses after the underground buried object is removed,
Since subsidence and inclination etc. do not occur in the above-ground structure, and excess or deficiency of the filler can be confirmed at the surface opening of the filler injection hole, problems such as ground subsidence due to insufficient filler can also be prevented. it can. Moreover, since vibration is applied at the same time while filling the filling material, not only the filling material is compacted but also the loosened surrounding ground is compacted by the vibration, so that it is possible to reliably fill the cavity created underground. become.

[Brief description of drawings]

FIG. 1 is a plan view showing a method for filling an underground cavity according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is an operation explanatory view showing a filling step.

FIG. 4 is an explanatory view of the same operation.

FIG. 5 is an explanatory view of the same operation.

FIG. 6 is an explanatory view of the same operation.

FIG. 7 is an explanatory view of the same operation.

FIG. 8 is an explanatory view of the same operation.

[Explanation of symbols]

 1 Underground buried object 3 Filling material injection hole 4 Filling material 5 Cavity 6 Vibration generator

Front page continuation (71) Applicant 591036675 Nagasawa Industry Co., Ltd. 164 Chikusacho, Chiba City, Chiba Prefecture (72) Inventor Katsukuni Ashino 3-1-2 Takada, Chigasaki City, Kanagawa Prefecture (72) Inventor Masato Mori Shinjo, Yamagata Prefecture 7-36 Odashima-cho, Yokohama

Claims (2)

[Claims] 1. A plurality of filler injection holes 3 are drilled from the ground surface toward the underground buried object 1 to be removed and along the underground buried object 1, and the underground buried object 1 is pulled out while being sequentially pulled out. A method for filling an underground cavity with removal of an underground buried object, which comprises filling the cavity 5 with the filler 4 through the filler injection hole 3 which is left behind. 2. A filling material injection hole (3) at the same time when the filling material (4) is injected.
The filling method of the underground cavity according to claim 1, wherein the filling material 4 is compacted by inserting a vibration generator 6 into the cavity 5 and applying vibration to the filling material 4.