JPH11323904A - Filling method of underground cavity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling method of an underground cavity capable of safely and reliably advancing work in filling the underground cavity without excavating the ground and sharply reducing the occurrence of environmental pollution and a traffic obstacle. SOLUTION: A filling method of an underground cavity has a process of boring a small diameter hole 4 from aboveground in the vicinity of the top part of the underground cavity and a process of filling the underground cavity by sending in an aggregate and foaming setting slurry 6c from the small diameter hole 4 by performing or without performing a process of filling at least a part of the underground cavity by sending in a fluid filler containing an aggregate and a fluidizing agent or an aggregate and setting slurry 6b from the small diameter hole 4, and contains a process of stabilizing a packing material in the underground cavity by curing and transforming the foaming setting slurry 6c into a porous solid body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling an underground cavity generated underground such as a road surface or other structures, and more particularly to a method of filling a ground underground with a defect in a buried pipe or the like, in which soil or the like in the ground flows out or a buried object. The present invention relates to a filling method for efficiently filling underground cavities generated due to movement of condensed soil and the like around consolidation and strengthening the ground.

[0002]

2. Description of the Related Art Water supply, sewerage,
In addition, various pipes for city gas, electric power, telecommunications, etc. are often buried, and when these pipes are damaged, the earth and sand in the ground flow out of the damaged parts and cavities are generated. May be. Such underground cavities not only increase in scale when left unattended, leading to road surface depression or the like, but also hinder traffic and cause damage to various structures and buried objects.

Recently, a method of repairing a damaged portion of an underground pipeline from the inside of the pipeline, for example, a soil coagulant or the like filled in the pipeline is leached out of the defective portion into the ground and solidified to form the defective portion. Method of sealing and fixing the surroundings, method of applying a water-resistant paint or the like to the inner surface of the buried pipe to form a lining that seals the defective part, after introducing a flexible synthetic resin pipe inside the buried pipe A method of expanding and hardening and forming a lining on the inner surface of the pipe was developed, without excavating the ground,
The pipeline can be repaired efficiently and economically. But when an underground cavity is emerging,
Repairing the pipeline alone cannot prevent the danger of road surface collapse.

Conventionally, when it is found that an underground cavity has been generated, the position, size, shape, etc. of the cavity are measured using various exploration means, and excavation is performed from the ground to remove the upper soil and sand. It was common practice to repair pipes, etc., and to fill the cavities with new earth and sand to restore them. However, such a method of excavating from the ground and filling the earth and sand requires a large amount of earth and sand to be carried out and backfilled. There are also problems.

Therefore, the present inventor drilled a small hole near the top of an underground cavity from the ground without excavating from the ground when a cavity was found in the ground, and sent earth and sand from the small hole. After filling most of the subterranean cavity, the solidified slurry containing buoyant light granular aggregate is fed from the small holes to fill the rest of the subterranean cavity, and then cured. A method of filling the underground cavity safely and economically by solidifying and stabilizing the filling of the underground cavity has been proposed, and a patent application has been filed.

[0006]

However, even when the new cavity filling method as described above is employed, depending on the shape of the underground cavity, voids are likely to remain at the upper portion of the cavity, and the filling and repair of the remaining voids is required. Re-paving work or the like may be required, and such work may cause environmental pollution such as noise and dust or traffic obstacles even in a short period of time. Therefore, the present invention has been made to solve such a problem, and in filling an underground cavity without excavating the ground, it is possible to safely and reliably proceed with the construction, and to prevent environmental pollution and traffic obstacles. An object of the present invention is to provide a method for filling an underground cavity, which can greatly reduce the generation.

[0007]

A method of filling an underground cavity according to the present invention, which can achieve the above object, comprises the steps of: forming a small-diameter hole from the ground near the top of the underground cavity; Filling the underground cavity by feeding a porous slurry, and curing and stabilizing the filling in the underground cavity, and converting the foaming-coagulable slurry into a porous aggregate. Features.

Further, after the step of drilling a small-diameter hole from the ground near the top of the underground cavity, a flowable filler containing an aggregate and a fluidizing agent is fed from the small-diameter hole to at least fill the underground cavity. A step of filling a part of the underground cavity by carrying out the step of partially filling or immediately feeding aggregate and coagulable slurry from the small hole without performing the step, and thereafter performing the step of filling the small hole Filling the remaining portion of the subterranean cavity with more aggregate and expanded coagulating slurry, curing and stabilizing the filling in the subsurface cavity, and coagulating the expanded coagulating slurry with porous coagulation. And converting to body.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be described with reference to FIGS. The underground cavity 1, to which the method of the present invention is applied, is caused by the fact that, for example, due to a partial damage of a sewage pipe 2 or the like buried under a paved road, the sediment around the damaged portion 2a is lowered together with the groundwater. It occurs due to circumstances such as flowing into the water pipe 2 and being carried away. Until the underground cavity 1 develops, no abnormality is found from the surface of the ground, and when deformation such as cracks is found in the pavement 3 on the surface, the top of the underground cavity 1 reaches just below the pavement 3. Often. In such a case, a small-diameter hole 4 is placed at a position presumed to be the top of the underground cavity 1 without performing an underground structure exploration using an ultrasonic wave or an ultra-high frequency radio wave.
Then, for example, a fiberscope or a television camera is inserted to confirm the presence of the underground cavity 1, and its shape, volume, and the like are measured.

Next, based on the measured data and the observation data of the soil quality around the underground cavity 1, the properties and necessary amount of the earth and sand to be filled into the underground cavity 1 are calculated, and the earth and sand, a coagulant and other materials and equipment are calculated. Prepare for After the materials and equipment are ready, the mixture 6a of the aggregate such as earth and sand and the fluidizing agent such as water or the aggregate and cement milk etc. is passed through the small diameter hole 4 through the earth and sand inlet pipe 5 and the like. The mixture 6b with the coagulable slurry is fed. In this case, the mixture 6b of the aggregate and the coagulable slurry may be fed in from the beginning, but first, the mixture 6a of the aggregate and the fluidizing agent is fed,
Next, the filling may be sequentially performed so as to feed the mixture 6b of the aggregate and the coagulable slurry.

As the coagulable slurry at this time, for example, cement milk in which Portland cement or blast furnace cement is mixed with water, or coagulable slurry in which clay and lime are mixed with water are used. Among them, cement milk is preferable. Commonly used. However, the material is not necessarily limited to cement milk and the like, and any liquid material having a coagulation action similar to these can be used. If the concentration of the coagulable slurry is too high, not only is it not economical, but also when the underground needs to be excavated in the future, the strength after coagulation may be too high and hinder the excavation work. If the concentration is too low, the strength of the filler after coagulation is low, so that the ground stabilizing effect is weak, and there is a danger that cavities may be formed again, which is not preferable. Therefore, the concentration of the coagulable slurry is such that, after coagulation, it shows coagulability to the extent that it can exhibit the same compressive strength as earth and sand in the ground,
It is desirable to adjust.

In this way, the mixture containing the aggregate is fed in order from the lower part of the underground cavity 1, and after most of the underground cavity 1 is filled, the foamable coagulable slurry together with the aggregate is passed through the small diameter hole 4. Start sending. Here, the foaming coagulable slurry generates bubbles and generates a porous coagulated body,
It works as a binder for aggregates, for example, cement milk in which Portland cement or blast furnace cement is mixed in water, or coagulable slurry in which clay and lime are mixed in water.
A slurry obtained by adding aluminum powder or the like to an alkaline slurry to impart air bubble generation properties is preferably used.
However, the composition is not necessarily limited to such a composition, and an appropriate slurry material may be used as long as it has a similar foaming action and a coagulation action of binding aggregate. be able to.

After the remaining portion of the underground cavity 1 is filled with the mixture 6c of the aggregate and the foam-setting slurry,
In order to solidify these fillings, curing is performed for a required time to solidify and stabilize the whole fillings in the underground cavity 1. Then, the mixture 6c containing the foaming coagulable slurry sent last is gradually foamed and expanded, and at the same time, is converted into a porous condensate. Therefore, even the slight space remaining at the top of the underground cavity 1 is porous. It will be filled with quality aggregates, forming a reinforced subgrade under the pavement above ground. Thereafter, the small-diameter hole 4 left in the pavement 3 on the ground is sealed, and repair work and the like are performed as necessary, thereby completing the filling work of the underground cavity 1.

[0014]

By carrying out the method for filling an underground cavity according to the present invention, the inside of the underground cavity is filled with the filler without any gap up to the top, so that the strength of the ground including the repaired portion is sufficiently increased. And since it is not necessary to perform a large-scale construction such as excavating the pavement and excavating earth and sand, the man-hour and the construction period are short, and the road surface can be used immediately after the completion of the construction. Therefore, there is little time to hinder traffic,
Moreover, there is almost no risk of environmental pollution due to the construction, and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first step in a method of filling an underground cavity according to the present invention, in which a small-diameter hole is drilled from the ground.

FIG. 2 is an explanatory view of a state in which a filling mixture is fed in the method for filling an underground cavity according to the present invention.

FIG. 3 is an explanatory view of a state after filling in a method for filling an underground cavity according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground cavity 2 Sewage pipe 2a Damaged part 3 Pavement 4 Small diameter hole 5 Sediment feeding pipe 6a Mixture of aggregate and fluidizer 6b Mixture of aggregate and coagulable slurry 6c Aggregate and foam-coagulable slurry Mixture of

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[Procedure amendment]

[Submission date] June 22, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Method of filling underground cavity

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling an underground cavity generated underground such as a road surface or other structures, and more particularly to a method of filling a ground underground with a defect in a buried pipe or the like, in which soil or the like in the ground flows out or a buried object. The present invention relates to a filling method for efficiently filling underground cavities generated due to movement of condensed soil and the like around consolidation and strengthening the ground.

[0002]

2. Description of the Related Art Water supply, sewerage,
In addition, various pipes for city gas, electric power, telecommunications, etc. are often buried, and when these pipes are damaged, the earth and sand in the ground flow out of the damaged parts and cavities are generated. May be. Such underground cavities not only increase in scale when left unattended, leading to road surface depression or the like, but also hinder traffic and cause damage to various structures and buried objects.

Recently, a method of repairing a damaged portion of an underground pipeline from the inside of the pipeline, for example, a soil coagulant or the like filled in the pipeline is leached out of the defective portion into the ground and solidified to form the defective portion. Method of sealing and fixing the surroundings, method of applying a water-resistant paint or the like to the inner surface of the buried pipe to form a lining that seals the defective part, after introducing a flexible synthetic resin pipe inside the buried pipe A method of expanding and hardening and forming a lining on the inner surface of the pipe was developed, without excavating the ground,
The pipeline can be repaired efficiently and economically. But when an underground cavity is emerging,
Repairing the pipeline alone cannot prevent the danger of road surface collapse.

Conventionally, when it is found that an underground cavity has been generated, the position, size, shape, etc. of the cavity are measured using various exploration means, and excavation is performed from the ground to remove the upper soil and sand. It was common practice to repair pipes, etc., and to fill the cavities with new earth and sand to restore them. However, such a method of excavating from the ground and filling the earth and sand requires a large amount of earth and sand to be carried out and backfilled. There are also problems.

Therefore, the present inventor drilled a small hole near the top of an underground cavity from the ground without excavating from the ground when a cavity was found in the ground, and sent earth and sand from the small hole. After filling most of the subterranean cavity, the solidified slurry containing buoyant light granular aggregate is fed from the small holes to fill the rest of the subterranean cavity, and then cured. A method of filling the underground cavity safely and economically by solidifying and stabilizing the filling of the underground cavity has been proposed, and a patent application has been filed.

[0006]

However, even when the new cavity filling method as described above is employed, depending on the shape of the underground cavity, voids are likely to remain at the upper portion of the cavity, and the filling and repair of the remaining voids is required. Re-paving work or the like may be required, and such work may cause environmental pollution such as noise and dust or traffic obstacles even in a short period of time. Therefore, the present invention has been made to solve such a problem, and in filling an underground cavity without excavating the ground, it is possible to safely and reliably proceed with the construction, and to prevent environmental pollution and traffic obstacles. An object of the present invention is to provide a method for filling an underground cavity, which can greatly reduce the generation.

[0007]

According to the first aspect of the present invention, there is provided a method for forming a small-diameter hole near the top of an underground cavity from the ground, and an aggregate from the small-diameter hole. And aluminum powder as foam-setting slurry
And filling the underground cavity with cement milk containing , and curing and stabilizing the filling in the underground cavity and converting the foaming and setting slurry to a porous aggregate. This is a method for filling an underground cavity, which is sequentially included.

According to a second aspect of the present invention, a step of forming a small-diameter hole from above the ground near the top of the underground cavity, and feeding aggregate and coagulable slurry from the small-diameter hole to increase the size of the underground cavity Filling the portion, filling the remaining portion of the underground cavity by feeding the aggregate and the foam-setting slurry from the small-diameter hole, and curing to stabilize the filling in the underground cavity. filling of underground cavities, characterized in that said containing foaming settable slurry sequentially and a step of converting the porous aggregates with
Is the way.

According to a third aspect of the present invention, there is provided a step of forming a small-diameter hole from the ground near the top of an underground cavity, and feeding a flowable filler containing an aggregate and a fluidizing agent from the small-diameter hole. Filling the at least a part of the underground cavity by feeding the aggregate and the coagulable slurry from the small hole to fill the remaining majority of the underground cavity; and Feeding the foaming settable slurry to fill the remaining portion of the underground cavity, curing and stabilizing the filling in the underground cavity, and converting the foaming settable slurry to a porous aggregate. underground cavities, characterized in that it successively comprises a step
It is a filling method.

[0010] The invention described in claim 4 is based on claim 3.
In the described invention, the fluidizing agent is water, an aqueous liquid,
And at least one selected from aqueous slurries
It is characterized by the following.

[0011] The invention described in claim 5 is the second invention.
In the invention according to any one of the first to fourth aspects,
Lee is a cement milk containing aluminum powder.
It is characterized by that.

[0012] The invention described in claim 6 is the second invention.
The coagulable slurry according to any one of the first to fifth aspects,
Is cement milk.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be described with reference to FIGS. The underground cavity 1, to which the method of the present invention is applied, is caused by the fact that, for example, due to a partial damage of a sewage pipe 2 or the like buried under a paved road, the sediment around the damaged portion 2a is lowered together with the groundwater. It occurs due to circumstances such as flowing into the water pipe 2 and being carried away. Until the underground cavity 1 develops, no abnormality is found from the surface of the ground, and when deformation such as cracks is found in the pavement 3 on the surface, the top of the underground cavity 1 reaches just below the pavement 3. Often. In such a case, a small-diameter hole 4 is placed at a position presumed to be the top of the underground cavity 1 without performing an underground structure exploration using an ultrasonic wave or an ultra-high frequency radio wave.
Then, for example, a fiberscope or a television camera is inserted to confirm the presence of the underground cavity 1, and its shape, volume, and the like are measured.

Next, from the measured data and the observation data of the soil quality around the underground cavity 1, the properties and necessary amount of the earth and sand to be filled into the underground cavity 1 are calculated, and the earth and sand, a coagulant and other materials and equipment are calculated. Prepare for After the materials and equipment are ready, the mixture 6a of the aggregate such as earth and sand and the fluidizing agent such as water or the aggregate and cement milk etc. is passed through the small diameter hole 4 through the earth and sand inlet pipe 5 and the like. The mixture 6b with the coagulable slurry is fed. In this case, the mixture 6b of the aggregate and the coagulable slurry may be fed in from the beginning, but first, the mixture 6a of the aggregate and the fluidizing agent is fed,
Next, the filling may be sequentially performed so as to feed the mixture 6b of the aggregate and the coagulable slurry.

As the coagulable slurry at this time, for example, cement milk in which Portland cement or blast furnace cement is mixed with water, or coagulable slurry in which clay and lime are mixed with water are used. Among them, cement milk is preferable. Commonly used. However, the material is not necessarily limited to cement milk and the like, and any liquid material having a coagulation action similar to these can be used. If the concentration of the coagulable slurry is too high, not only is it not economical, but also when the underground needs to be excavated in the future, the strength after coagulation may be too high and hinder the excavation work. If the concentration is too low, the strength of the filler after coagulation is low, so that the ground stabilizing effect is weak, and there is a danger that cavities may be formed again, which is not preferable. Therefore, the concentration of the coagulable slurry is such that, after coagulation, it shows coagulability to the extent that it can exhibit the same compressive strength as earth and sand in the ground,
It is desirable to adjust.

In this way, the mixture containing the aggregate is fed in order from the lower part of the underground cavity 1, and after most of the underground cavity 1 has been filled, the foam-coagulable slurry together with the aggregate is passed through the small-diameter hole 4. Start sending. Here, the foaming coagulable slurry generates bubbles and generates a porous coagulated body,
It works as a binder for aggregates, for example, cement milk in which Portland cement or blast furnace cement is mixed in water, or coagulable slurry in which clay and lime are mixed in water.
A slurry obtained by adding aluminum powder or the like to an alkaline slurry to impart air bubble generation properties is preferably used.
However, the composition is not necessarily limited to such a composition, and an appropriate slurry material is used as long as it has a similar foaming action and also has a coagulation action of binding aggregate. be able to.

After the remaining portion of the underground cavity 1 is filled with the mixture 6c of the aggregate and the foam-setting slurry,
In order to solidify these fillings, curing is performed for a required time to solidify and stabilize the whole fillings in the underground cavity 1. Then, the mixture 6c containing the foaming coagulable slurry sent last is gradually foamed and expanded, and at the same time, is converted into a porous condensate. Therefore, even the slight space remaining at the top of the underground cavity 1 is porous. It will be filled with quality aggregates, forming a reinforced subgrade under the pavement above ground. Thereafter, the small-diameter hole 4 left in the pavement 3 on the ground is sealed, and repair work and the like are performed as necessary, thereby completing the filling work of the underground cavity 1.

[0018]

By carrying out the method for filling an underground cavity according to the present invention, the inside of the underground cavity is filled with the filler without any gap up to the top, so that the strength of the ground including the repaired portion is sufficiently increased. And since it is not necessary to perform a large-scale construction such as excavating the pavement and excavating earth and sand, the man-hour and the construction period are short, and the road surface can be used immediately after the completion of the construction. Therefore, there is little time to hinder traffic,
Moreover, there is almost no risk of environmental pollution due to the construction, and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first step in a method of filling an underground cavity according to the present invention, in which a small-diameter hole is drilled from the ground.

FIG. 2 is an explanatory view of a state in which a filling mixture is fed in the method for filling an underground cavity according to the present invention.

FIG. 3 is an explanatory view of a state after filling in a method for filling an underground cavity according to the present invention.

[Description of Signs] 1 Underground cavity 2 Sewage pipe 2a Damaged part 3 Pavement 4 Small diameter hole 5 Sediment inlet pipe 6a Mixture of aggregate and fluidizing agent 6b Mixture of aggregate and coagulable slurry 6c Aggregate Mixture with foam-setting slurry

Claims (6)

[Claims] 1. A step of forming a small-diameter hole from the ground near the top of an underground cavity, a step of feeding an aggregate and a foam-setting slurry from the small-diameter hole to fill the underground cavity, and curing the underground cavity. And stabilizing the filling in the underground cavity and converting the foam-setting slurry into a porous aggregate. 2. A step of drilling a small diameter hole from the ground near the top of the underground cavity, a step of feeding aggregate and coagulable slurry from the small diameter hole to fill most of the underground cavity, A step of feeding the aggregate and the foam-setting slurry from the small-diameter hole to fill the remaining portion of the underground cavity; curing the material in the underground cavity to stabilize the filling; Converting the underground cavity into a porous aggregate. 3. A step of forming a small-diameter hole from above the ground near the top of the underground cavity, and feeding a flowable filler containing an aggregate and a fluidizing agent from the small-diameter hole to at least a part of the underground cavity. Filling the aggregate and coagulable slurry from the small-diameter hole to fill the remaining majority of the underground cavity;
Feeding the aggregate and the foam-setting slurry from the small-diameter hole to fill the remaining portion of the underground cavity; curing and stabilizing the filling in the underground cavity; 3. The method of filling an underground cavity according to claim 1, further comprising a step of converting into a porous aggregate. 4. The foam coagulable slurry is a cement milk containing aluminum powder.
The method for filling an underground cavity according to any one of the above. 5. The method according to claim 2, wherein the coagulable slurry is cement milk. 6. The method according to claim 3, wherein the fluidizing agent is at least one selected from water, an aqueous liquid, and an aqueous slurry.