JP2000328886A - Filling method for void - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling method for a void capable of securely filling a filling material without leakage of the filling material from a gap even when there is a gap communicating with the void or even under the conditions of underground water or flowing water. SOLUTION: Cement milk (A-liquid) including cement and water, or cement, water, and air bubbles and bentonite milk (B-liquid) including bentonite and water, or bentonite, water, and air bubbles are mixed together as a plastic material for a first injection material. The first injection material is filled (ST1) into a specified zone in a void. Subsequently, a second injection material prepared as a flowable substance composed of the cement milk (A-liquid) including cement and water, or cement, water, and air bubbles is filled (ST2) in the remaining filling zone of the void. In this way, the first injection material and the second injection material are placed one after the other to fill the void.

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 a hollow portion, and more particularly, to a first method having plasticity in a specific region of the hollow portion.
And the remaining filling region of the cavity is filled with a second filling material having fluidity, and the cavity is filled with the first filling material and the second filling material by passing over. The present invention relates to a method for filling a cavity.

[0002]

2. Description of the Related Art Such a method of filling a hollow portion is used, for example, in an existing tunnel to fill a hollow portion or the like generated on the back surface of a tunnel shaft or the like due to inflow of groundwater or the like after operation of the tunnel. .

[0003] Such a cavity at the back of the tunnel shaft may occur in a tunnel where the rock surface is exposed, such as a mountain tunnel, or in a tunnel with concrete lining. This cavity is confirmed at various places by nondestructive inspection or the like.

In the cavity, the wind pressure generated when passing through the vehicle,
There is a danger that the skin surface of the tunnel will fall off due to vibration or the like, and it is necessary to perform repairs to ensure the safety of the operation of the vehicle.

[0005] The repair of the tunnel is performed by filling a solidified body in the tunnel cavity. As a material forming the solidified body to be filled, a cement-based injection material such as cement milk is known.
In this conventional method, a cement-based injectable material before solidification is injected into a hollow portion, and the injected material is cured in the hollow portion to form a hardened body in the hollow portion.

[0006] If there is running water, such as groundwater, in a cavity where such an injection material is to be filled, the injection material is dispersed and the injection material cannot be effectively filled into the cavity. There is a problem.

Further, if there is a gap such as a crack or a pinhole leading to the cavity on the wall surface of the pit, the leaked injected material leaks out of the gap into the inside of the tunnel or the ground, so that the injected material is reliably injected into the cavity. The problem that filling cannot be performed occurs.

In order to prevent such an injection material from deviating to the surroundings, the injection material is not gelled and dispersed into groundwater or running water, and an agglomerate having a shape that does not easily deviate to the surroundings due to its shape imparting property. That is, it is required to be an aggregate having plasticity, and in order to impart such properties to the injection material, a water glass-based chemical solution or aluminum salts are added to cement milk, and the injection material is plasticized. May be used.

Further, when the present applicant mixes bentonite milk with cement milk, a strong aggregate can be formed by the action of the agglomeration of bentonite by the calcium ions, and the injection material in a plastic state with a controlled flow value. It has been found that the above problem can be solved by injecting this mixture as an injectable material, as disclosed in Japanese Patent Application No. 10-130143.
No. has filed a patent application.

[0010] However, if such a plastic material is injected into all parts of the cavity,
Since the cost of the plastic injection material is more expensive than the injection material consisting of only cement milk, there is a problem that the material cost of the injection material is increased and the construction cost is increased.

[0011]

SUMMARY OF THE INVENTION Therefore, according to the present invention, even if there is a gap leading to the hollow portion, the injected material can be reliably filled into the hollow portion without leaking out of the injected material from the gap. However, an object of the present invention is to provide a cavity filling method capable of filling an injecting material and reducing the material cost of a filling material used for filling as much as possible.

[0012]

According to the present invention, cement and water, or cement milk (liquid A) containing cement, water and air bubbles, bentonite and water, or bentonite and water are filled in a specific region of the cavity. And bentonite milk (liquid B) containing a mixture of the first injection material and the first injection material formed to have plasticity (ST).
1) Then, in the remaining filling region of the cavity, a second injection material formed as cement and water, or cement milk (liquid A) containing cement, water, and air bubbles, and formed as having fluidity is used. Filling (ST2) The cavity filling method is characterized in that the cavity is filled with the first injection material and the second injection material by successively filling.

That is, the inventor uses a chemically stable inorganic material without using a water glass-based chemical solution or aluminum salts when controlling the flow value of the injection material, gels the cement milk, As a result of intensive studies on whether or not it can be equipped with bentonite, we focused on the fact that swollen bentonite in bentonite milk prepared by sufficiently stirring bentonite with water is aggregated by the action of cations, And found that calcium ions in cement milk can be used.

Further, according to the present invention, since the injection material is prepared by mixing the previously prepared cement milk and bentonite milk, it can be easily mixed and plasticity is quickly generated. Therefore, according to the present invention,
Before filling the specific region of the cavity with the injection material, the cement material and the bentonite milk are mixed to prepare the injection material, and the injection material is filled into the cavity, so that the filling material to be filled is sufficiently kneaded and prepared. The cavity is filled in the filled state, and the filled injectable material is filled into the cavity with the optimal plasticity for filling the cavity, so that no voids or deviations occur in the cavity.

[0015] Cement milk (solution A), which can be used in common for the first and second injection materials and has a low material cost, is free from leakage or dispersion due to running water.
Considering that it has sufficient performance to fill the cavity, after filling the specific region of the cavity with the first injection material having the plasticity, the second material consisting of only the liquid A is used. It has been found that if the injectable material is injected into the remainder of the cavity, the second injectable material will cure and provide sufficient performance to fill the cavity. That is, the inventors have found that the above-mentioned problems can be solved by selectively and temporally and spatially injecting the first injection material and the second injection material into the hollow portion, and have completed the present invention. It is.

In the present invention, the specific region of the cavity filled with the first injection material may leak or disperse when the second injection material is injected. Or where there is a risk of them,
The second injectable material is filled with the first injectable material in a specific region of the cavity, so that the second injectable material is prevented from leaking or dispersing, or from the possibility that the injectable material is no longer in danger. The filling method of the hollow portion is characterized in that the remaining filling region of the hollow portion is filled by being connected.

As described above, when the second injection material in the cavity leaks or disperses, or when the first injection material having plasticity is first injected into a specific area where the second injection material is likely to leak or disperse, the first injection material is removed. Since the injection material has plasticity, it surely fills the region without leaking from a gap or being dispersed by water. Thereafter, even if the second injection material is injected into the remaining region, the second injection material does not leak or disperse, and the interior of the cavity is filled and hardened satisfactorily.

Therefore, it is not necessary to inject the expensive first injection material into the entire region of the cavity, and the inexpensive second injection material can be injected into the region occupying most of the cavity, The material cost of the filler used for filling the cavity can be reduced as a whole. In addition, since the cement milk used to prepare the first injection material can be used as it is as the second injection material, it is not necessary to add equipment for preparing and injecting the injection material. In addition, it is possible to properly select and inject the characteristics, the injection position, and the injection amount of each injection material according to the situation of the construction place. Furthermore, the injection of the first injection material is completed, and the machine for injecting bentonite milk (Solution B) can be removed at an early stage, and the execution cost can be reduced.

In the present invention, the first injection material is JI
In the flow test defined in SR5201, 140
A method for filling a cavity, which has a flow value of from 200 mm to 200 mm, is used as the means.

That is, the flow value of the first injection material is 140
When the diameter is less than mm, the cohesive force is too strong, so that the material to be injected lacks fluidity, and when filled in a hollow portion, an unfilled portion (hollow portion) may be left in the filled portion. Also,
If the flow value exceeds 200 mm, the cohesive force is too weak,
The injection material can be washed and separated by running water or groundwater, and the injection material can escape from cracks and pinholes in the wellhead.

Further, in the present invention, the first filling material containing bubbles has a bubble filling method characterized by having a bubble mixing amount of 60% or less with respect to the total volume. .

The amount of air bubbles mixed into the total volume of the injected material is 6
If it exceeds 0%, the amount of air bubbles increases, so that the amount of cement and bentonite used is reduced, and it becomes difficult to develop the plasticity of the injection material and the strength of the cured product of the injection material.

When injecting the first injection material into a specific region of the hollow portion, a liquid A composed of cement milk and a liquid B composed of bentonite milk may be separately injected.
The milk does not mix well in the cavities, and the injection material of the desired flow value is not prepared. Therefore, cement milk and bentonite milk need to be mixed and prepared as an injection material before being injected into a specific region of the cavity.

In the present invention, the first injection material has a mixing ratio of cement milk and bentonite milk of 1: 1:
A method for filling a cavity, which is in the range of 1 to 1: 2.5, is used as the means.

In the first injection material in which cement milk and bentonite milk are mixed, when the mixing ratio of bentonite milk is increased, the coagulation of the mixture becomes stronger, the flow value becomes smaller, and conversely, the mixing ratio of cement milk is increased. Then, the flow value increases. Therefore, the above 140
In order to secure a flow value in the range from 200 mm to 200 mm,
The mixing ratio of cement milk and bentonite milk is
A range from 1: 1 to 1: 2.5 is preferred. Therefore, according to the present invention, it is possible to obtain an injectable material having optimal plasticity for first filling a specific portion of the cavity, and it is possible to reliably and easily fill the cavity.

Further, as the bentonite used for the bentonite milk which is a raw material of the injection material in the present invention, a bentonite having a larger swelling power is preferable. The use of bentonite with a large swelling power can reduce the amount of bentonite used, reduce the weight of the injection material, reduce the size of storage facilities such as silos,
It is good in handling and the like.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for filling a cavity according to the present invention will be described below.

The method for filling the cavity according to the present embodiment is as follows.
As shown in FIG. 1, first, a specific region of the cavity is filled with a first injection material having plasticity. In the first injection material, as shown in FIG. 2, the liquid A is prepared in the liquid preparation section 1, the liquid B is prepared in the liquid preparation section 5, and these two liquids are statically formed immediately before the cavity. The mixture is mixed by a mixer 20 such as a mixer and injected into the cavity.

The liquid A is prepared by mixing cement and water (where necessary, including air bubbles and various admixtures, etc .; the same applies hereinafter) in the liquid preparation section 1. The B liquid is prepared by mixing bentonite and water (mixed with various admixtures as necessary; the same applies hereinafter) in the B liquid preparation section 5.

The liquids A and B are pumped by the pumps 3 and 7 and mixed by the static mixer 20 until immediately before the cavity to be filled. At this time, in order to control the flow value of the injection material from 140 mm to 200 mm, the mixing ratio of the solution A and the solution B is set to be in the range of 1: 1 to 2.5. Then, the mixture of the solution A and the solution B is injected into a predetermined region of the cavity as a first injection material.

As shown in FIG. 2, the liquid A and the liquid B are
The pumps 3 and 7 pump the liquid from the A liquid production part 1 and the B liquid production part 5 to the respective branch pipes 11 and 12 of the Y-shaped branch pipe 10, and are provided at the end of the junction pipe 13 of the branch pipe 10. Mixed by the static mixer 20. In FIG. 2, reference numerals 2, 4, 6, and 8 denote on-off valves provided at predetermined locations in the pipeline.

Further, the mixer 20 is a cylindrical device, and as shown in FIG. 3, is provided with a mixing blade 21 for mixing the liquid A and the liquid B press-fitted in the inside thereof during the pressure feeding process. is there.

Then, the mixed plastic first injection material having a predetermined flow value is injected into a specific region of the cavity. After the injection of the plastic first injection material is completed and the first injection material is surely filled in the specific region, the B liquid preparation unit 5
Then, the operation of the pump 7 for pumping the liquid B is stopped, and the on-off valves 6 and 8 are closed. On the other hand, while the A liquid preparation section 1 and the pump 3 for pumping the A liquid are kept in the operating state,
4 remains in the open state, and a second injection material consisting only of the liquid A is injected into the remaining portion of the cavity.

Here, the cement used for preparing the liquid A is as follows:
Normal, fast, super fast, white, sulfate resistant, moderate heat, low heat, etc. various Portland cement, mixed cement mixed with at least one of the Portland cement and at least one of blast furnace slag, fly ash, It can be selected from special cements such as jet cement and alumina cement, and cement-based solidification materials.

The liquid A may be a cement air milk in which bubbles obtained by foaming a foaming agent are mixed if necessary. The mixing amount of the bubbles is preferably 60% by volume or less of the total amount of the injection material, and the density is 0.6 g / cm ^{3 to} 1.2 g depending on the amount of the bubbles.
An arbitrary density of about / cm ³ can be set. Density 0.
If the amount of air bubbles is more than 60% in order to reduce the amount to about 6 g / cm ³ or less, the amount of air bubbles is too large, resulting in an excessively small amount of cement and bentonite, plasticization of the injected material and hardening of the injected material. It becomes difficult to express the strength of the body.

If necessary, the cement milk of the liquid A may be
An admixture such as a water reducing agent may be added. If there is a possibility of material separation in the liquid A cement milk, a small amount of bentonite may be added to the liquid A as needed for the purpose of preventing material separation.

The quality of the bentonite used in the liquid B is not particularly limited, but if the bentonite has a low swelling power, it is necessary to increase the amount of bentonite, and it is not preferable because the material is easily separated. Further, when it is necessary to reduce the weight of the injection material, it is necessary to reduce the amount of bentonite used, and for that purpose, use of bentonite having a higher swelling power is optimal.

The flow value of the prepared first injection material is J
From 140mm to 2 in the test specified in IS R5201
00 mm is preferred. If the flow value of the injected material is less than 140 mm, the cohesive force is too strong, so the injected material lacks fluidity, and when filling a specific region of the cavity, there is a possibility that gaps such as cracks and pinholes will not be filled. There is. On the other hand, if the flow value exceeds 200 mm, the cohesive force is too weak, and the injected material may be washed and separated by running water or groundwater, and the injected material may deviate from cracks and pinholes in the pit wall. There is.

In order to increase the material separation resistance of the cement milk of the liquid A, it is necessary to adjust the uniform range of the cement milk (including cement: water = 1: 0. (About 3 to 1: 1), the amount of water in liquid A should be reduced as much as possible. In order to increase the plasticity of the injection material obtained by mixing liquid A and liquid B, the bentonite in bentonite milk of liquid B should be more uniform , It is necessary to increase the amount of water of the liquid B. That is, when the total amount of water is kept constant, it is optimal to minimize the amount of the solution A and increase the amount of the solution B as much as possible, as long as the uniform mixing performance is not reduced.

[First Embodiment] In this embodiment, the cavity filled with the injection material is, for example, the cavity existing between the back surface 31 of the tunnel 30 and the ground 33 shown in FIGS. 32. The position, size, leakable position of the injected material, and leakage position of the groundwater of the hollow portion 32 existing in the ground on the side of the back surface 31 of the tunnel 30 of the tunnel 30 are confirmed by nondestructive inspection or the like.

In such a case, there are places where the outflow to the ground 33 may occur at the places 32 a and 32 b located at the ends of the cavity 32. Further, as shown in FIG.
Lowermost portions 32c, 32d along the back surface 31 of the tunnel hole
In some cases, there is a place where water flows out to the ground 33. Such a location is a location where the injection material leaks or may leak when a flowable injection material is injected. Such locations may occur in addition to the tunnel longitudinal ends 32a, 32b and the lateral ends 32c, 32d of the cavity 32. These locations may be determined by nondestructive inspection or the like. You can be sure.

Further, the leaking point of the groundwater is not limited to the end of such a cavity, but is located at the apex of the cavity or other places. First, such a place is filled with the first injection material, and the first injection material is filled. Is cured at the place (reference numeral 34 in FIGS. 4 and 5).

Since the first injection material according to the present invention has plasticity, both ends 32a, 32b, 32c, 32d are provided.
This gap is closed without leaking from the gap. In addition, when the first injection material is injected into a leaking point of groundwater or the like, the injection material is injected without being dispersed, and the leakage point of the groundwater or the like is closed.

Next, a second injection material is injected into the remaining portion of the cavity, and the second injection material is connected (reference numeral 35 in FIGS. 4 and 5). Since the second filling material is cement milk, which is rich in fluidity, it spreads all over the cavity 32 to be filled without gaps, has a predetermined strength after hardening, and serves the purpose of filling the filling material. Then, at the time of the injection, the cavity 32 to be filled is filled with the first injection material, so that there is no place where the second injection material leaks, and water leakage that dilutes the second injection material does not occur. Since it does not occur, the second injection material is reliably filled in the cavity without leaking or dispersing.

Second, as the liquid A (cement milk) used for the injection material, the same liquid as the liquid A (cement milk) of the first injection material can be used.
Cement and water as raw materials for producing cement milk are inexpensive as compared with B liquid (bentonite milk) mixed with A liquid in the first injection material. It can be charged at a cost.

[Second Construction Example] In this embodiment, as shown in FIG. 6, a concave portion with a hollow portion 41 facing downward is formed in the ground 42, and a groundwater vein is formed at the bottom of the hollow portion 41. The groundwater 44 stays up to the water level 43.

In such a case, first, the ground water 44 is pumped out with a submersible pump or the like, and the first injection material 45
As shown in FIG. 7, water is injected above the level 43 of the groundwater.

Since the first injection material according to the present invention has plasticity, the injection material is injected by the groundwater without being dispersed, and the groundwater outlet is closed.

Next, a second injection material 46 is injected into the remaining portion of the cavity and is connected. Since the second filling material is cement milk, which is rich in fluidity, the second filling material spreads all over the cavity 41 to be filled without gaps, has a predetermined strength after being filled and hardened, and has the purpose of filling the filling material. Add up.

At this time, the second liquid A (cement milk) used for the injection material can be the same as the liquid A (cement milk) of the first injection material. The raw material cement and water for producing milk are cheaper than the liquid B (bentonite milk) mixed with the liquid A in the first injection material, so that the cavity having the same internal volume can be used at a lower material cost. Can be filled.

[0051]

EXAMPLES The method of filling a hollow portion according to the present invention will be described in more detail with reference to examples. In each of the following examples, the preparation method, test material, and test method of the first injection material are as follows.

(Preparation method) Liquid A was prepared by kneading a cement-based solidifying material and water with a hand mixer for 2 minutes. When mixing air bubbles, air bubbles (a foaming agent diluted 25 times with water and then expanded 25 times) were added so as to have a predetermined mixing amount, and mixed for 30 seconds with a mixer to form a liquid. . Liquid B was obtained by kneading bentonite and water with a reciprocating stirring mixer for 5 minutes. The liquid A and the liquid B were mixed by a hand mixer for about 10 to 15 seconds to prepare an injection material.

(Test Materials) The materials used in the test are as follows. Cement: Sumitomo Osaka Cement Co., Ltd. cement-based solidifying material “Tafloc” (trademark) Plasticizer: High swelling bentonite (prototype) Foaming agent: Sumitomo Osaka Cement Co., Ltd. “Sumishield A” (trademark) Agent: High performance water reducing agent "Mighty 15" manufactured by Kao Corporation
0 ”(trademark)

(Test Method) Tests were conducted for "flow value", "strength", and "plasticization judgment" according to the following criteria.

[0055]Flow value  Cement physical test method, flow test (JIS R52)
01). That is, the injection material is added to the flow cone.
After filling and removing the flow cone, 15 times for 15 seconds
A falling motion was applied and the diameter of the spread of the sample was measured. In addition,
The diameter of the flow table for dropping is 300 mm.
Measurement was impossible for 300 mm or more.

[0056]Strength  The strength of the cured product of the injection material was measured as follows. Japanese Geotechnical Society standard “Uniaxial compressive strength test of soil (JIS A1
216) "Dimensions and number of specimens φ5 × H10cm, 3 specimens Age 28 days

[0057]Plasticization judgment  Injection material plasticity is determined by the Japan Society of Civil Engineers underwater inseparable concrete
Annex 2 of Underwater Construction Guidelines
It was determined by the test method. That is, 1000cc beaker
Put 800 cc of water in
Divided into 0, and put in from the water surface using a spatula for each division
Then, the state of suspension was visually observed and determined according to the following criteria.

Symbol Judgment content: No suspension at all. △: Some suspension. ×: Suspended. -… Materials were separated immediately after preparation, and this test was not performed.

Hereinafter, embodiments of the present invention will be described. [Embodiment 1] In this embodiment, the flow value, strength, and plasticization judgment were performed by changing the mixing ratio of the liquid A and the liquid B.
Table 1 shows the physical property values corresponding to the mixing ratio (weight ratio) of Liquid A and Liquid B.
Shown in In this example, w / c = 50% and bubble 3
Bentonite: water: 1: 7.1 (weight ratio) bentonite milk was used as liquid B with 8% cement air milk.

[0060]

[Table 1]

From Table 1, it can be seen that the flow value can be changed by changing the mixing ratio of the solution A and the solution B, and an injection material having a separation resistance of less than about 200 mm in JIS flow value can be obtained. .

[Example 2] In this example, the water cement ratio of the liquid A of the composition 3 (liquid A: liquid B = 1: 1.43) shown in Example 1 was changed to increase the water cement ratio. The flow value of
Strength and plasticization were determined. Table 2 shows the physical property values of the injection material corresponding to the change in the water cement ratio.

[0063]

[Table 2]

From Table 2, it can be seen that even if the water-cement ratio is changed, the same plasticity is obtained, and the strength can be arbitrarily changed.

Example 3 In this example, in order to grasp the optimum fluidity at the time of filling the cavity, the flow value, the filling property and the deviation to the periphery were evaluated. As shown in FIG. 8, the test of this example was performed using a transparent pipe 50 (inner diameter 15 cm, height 100 to 200
Crushed stones 51 were packed from the bottom to a height of 30 cm to form a crushed stone filling section 52, and a sample was injected from a hose 50 from a top of the pipe 50 at a flow rate of 20 l (liter) / min from a hose 53 (height: 70 to 170 cm). In this test, the penetration height (h in FIG. 8) of the sample from the upper surface portion of the crushed stone filling portion 52 was measured as an indicator of the deviation of the sample.

In the present embodiment, as a criterion for deviation of the injected material,
In consideration of the actual tunnel structure and the state of the inside of the cavity, it is estimated that there is no deviation from the cavity into the tunnel if the penetration into the crushed stone filling portion 52 is within 20 cm. The state of filling of the sample was visually confirmed. The composition of the injection material is the same as that shown in Table 1, and Table 3 shows the flow value and the results of determination of the filling property and permeability. The crushed stone used is crushed stone (ballast) for laying railway tracks, and the particle size is 20 to 60 mm.
It is about.

[0067]

[Table 3]

The criteria for determining the filling and permeation (deviation) are as follows. ○ The sample is completely filled, and the penetration of the crushed stone is less than 20 cm. × 1 There is a void in the sample. × 2 Penetration into crushed stone filling area of 20 cm or more.

Table 3 shows that the sample is completely filled when the JIS flow value is about 140 to 200 mm without affecting the injection height, and the possibility of departure to the periphery is low.

Example 4 In this example, a test was carried out by changing the procedure of preparing the injection material while using the same unit blending amount of cement and bentonite. Table 4 shows the results of the test.

[0071]

[Table 4]

From Table 4, it can be seen that the method of mixing bentonite powder with air milk has a low separation resistance, and for the separation resistance, it is necessary to mix a bentonite suspension swelled with water with air milk.

Example 5 In this example, a mixture of cement milk having the same water-cement ratio and different proportions of air bubbles was used.
The flow value of the injection material prepared by mixing the same bentonite milk with the liquid and the strength of the injection material after curing were measured. Table 5 shows the relationship between the amount of air bubbles after preparation, the flow value, and the strength. However, in this example, W / C =
40%, a high-performance water reducing agent of 2 kg / m ³ , and a solution B of bentonite: water = 1: 6-1: 7 were used.

[0074]

[Table 5]

From Table 5, it can be seen that when the unit cell amount exceeds 60%, it is difficult to develop strength because the unit cement amount and the unit bentonite amount decrease.

[0076]

Therefore, according to the method of filling a cavity according to the present invention, even if there is a gap leading to the cavity, the filling material can be reliably filled into the cavity without the leakage of the injected material from the gap. In addition, the filling material can be filled under ground water and running water,
In addition, it is not necessary to inject the expensive first injection material into the entire region of the cavity, and the inexpensive second injection material can be injected into the region occupying most of the cavity, and the filling of the cavity can be performed. Can reduce the material cost of the filler used as a whole, further complete the injection of the first injection material first, and can remove the machine for injecting bentonite milk at an early stage, thereby reducing the execution cost. The effect that it can be made to play is produced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a cavity filling method according to the present invention.

FIG. 2 is a block diagram showing a method of filling a cavity shown in FIG.

FIG. 3 is a sectional view showing the structure of the static mixer shown in FIG. 2;

FIG. 4 is a schematic vertical sectional view of a tunnel portion showing a case where the cavity filling method shown in FIG. 1 is applied to a tunnel cavity.

FIG. 5 is a schematic cross-sectional view of a tunnel portion showing a case where the cavity filling method shown in FIG. 1 is applied to a tunnel cavity portion.

FIG. 6 is a schematic sectional view of a cavity showing a cavity in which groundwater is stored, to which the method of filling the cavity shown in FIG. 1 is applied.

7 is a schematic cross-sectional view similar to FIG. 6, showing a case where the cavity filling method shown in FIG. 1 is applied to the cavity shown in FIG. 6;

FIG. 8 is a perspective view showing an apparatus for evaluating a flow value, a filling property, and a departure property to the surroundings.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A liquid production part 2, 4, 6, 8 On-off valve 3, 7 Pump 5 B liquid production part 10 Y-shaped pipe 20 Static mixer (mixer)

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yasushi Mentaka 585 Tomimachi, Funabashi-shi, Chiba Sumitomo Osaka Cement Co., Ltd.Cement and Concrete Research Center Kanto Technical Center (72) Inventor Tsukasa Uchizawa Funabashi, Chiba Prefecture 585 Tomicho, Sumitomo Osaka Cement Co., Ltd. Cement and Concrete Research Center Kanto Technical Center (72) Inventor Hiroaki Suzuki 1 Familiar, Kanda Midoshiro-cho, Chiyoda-ku, Tokyo F-term (reference) 2D055 JA00 4G012 PA06 PE01

Claims (5)

[Claims] A cement and water or cement milk containing cement, water and bubbles and a bentonite and water or bentonite milk containing bentonite, water and bubbles are mixed in a specific region of the cavity. Filling the first injection material formed as having plasticity, and then cement and water into the remaining filling area of the cavity,
Alternatively, a second filling material made of cement milk containing cement, water, and air bubbles and formed as having fluidity is filled, and the cavity is filled with the first filling material and the second filling material. The filling method of the cavity, characterized by filling with. 2. The method according to claim 1, wherein the specific region of the cavity filled with the first injection material leaks or disperses when the second injection material is injected, or The second injection material may not leak or disperse due to the first injection material being filled in a specific region of the cavity. 2. The method of filling a hollow portion according to claim 1, wherein the remaining filling region of the hollow portion is filled with the remaining portion after the risk of disappearing. 3. The method according to claim 1, wherein the first filling material is JIS R5201.
140mm to 200mm in the flow test specified in
The method for filling a hollow portion according to claim 1 or 2, wherein the method has a flow value of mm. 4. The cavity according to claim 1, wherein said first injection material containing air bubbles has an air bubble mixing amount of 60% or less with respect to the total volume. Filling method. 5. The first injection material has a mixing ratio of cement milk to bentonite milk of 1: 1 to 1: 2.5.
The method for filling a hollow portion according to any one of claims 1 to 4, wherein