JP2818843B2 - Suspended water method for retaining walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of an earth structure, and more particularly, to a method of suspending a ground retaining wall.

2. Description of the Related Art

As a method of making water continuous in the vertical direction on the ground,
The ground improvement method (deep stirring and mixing method = forcibly mixing and mixing in situ ground soil with a stabilizer such as cement or gypsum) is common. However, in this method, since the ground improvement is performed in a column shape, the watertightness between the column lines is reduced. In addition, since the cement is mixed to improve the water blocking property, the strength of the improved body is increased more than necessary. Further, it is impossible to improve the horizontal direction (the direction in which the ground is deposited). Conventionally, as a method of partially improving the water stopping of the ground, there is a chemical liquid injection method, and a water glass type is currently used. However, this method is often used when the range of improvement is narrow, but cannot be used for wide-range improvement because continuity in the horizontal and vertical directions cannot be guaranteed. In addition, in the chemical liquid injection method, in order to construct a water-stop structure by injecting water glass, acrylamide, urea, or other chemicals, the injection pitch is shortened due to the gel time of the chemical, and injection is performed at many locations. Otherwise, a water-stop construction with excellent continuity cannot be constructed, the workability is troublesome, the handling of the chemical solution requires attention, and there is a pollution problem, and the cost increases due to the expensive chemical solution. There's a problem. For example, in the case of a water glass-based injection agent, since gelation is caused by a chemical reaction, the gel time, solidification strength, and the like are affected by the quality of groundwater and the mixing state of the agent, and a predetermined injection effect may not be obtained. . In addition, there is also a construction method of filling a filler such as clay and fly ash, but it is difficult to fill these fillers in detail. In addition, in the filling method using concrete or mortar, since the material is not flexible, when a large deformation occurs in the ground, the filling portion cannot be deformed (because the filling portion has no flexibility). When a deformation factor is added to the above, there is a problem that a crack is generated in the portion.

[Means for Solving the Problems]

The present inventors in view of the above-mentioned problems of the prior art, as a result of intensive research, easy work, excellent water stoppage, good fillability,
We have developed a water stoppage method for mountain retaining walls that is flexible and can construct a pollution-free water stop. That is, the present invention relates to a hydrophilic material such as agar or gelatin that melts and solidifies between a ground retaining wall material such as a steel pile, a wooden pile, and a horizontal sheet pile and ground by a temperature change in a temperature range of room temperature to about 100 ° C. This is a ground stop water method for a mountain retaining wall, characterized by filling with a gelled material. In particular, it is effective to fill at least the peripheral portion of the connection portion between the unit body (for example, one steel sheet pile) and the unit body of the retaining wall material. About the method of the present invention, the aqueous solution of the hydrophilic material,
Add fine powder of inorganic materials such as soil, clay, bentonite, etc.
Mixing is also preferable, and further, an organic paste such as alpha starch, CMC, protein, etc. is added to the aqueous solution of the hydrophilic material.
It is also preferable to mix them. In the above, in the case of a gelled agar aqueous solution, the concentration is preferably an aqueous solution having a concentration of 0.2 to 4%. In the case of the agar gel, the melting temperature is 80 to 90 ° C, and the coagulation temperature is 30 to
At 40 ° C., the gelled material has a water permeability of about 1 × 10 ⁻⁶ to 1 × 10 ⁻⁸ cm / sec when it solidifies due to a decrease in temperature.
The unit weight of the hydrophilic material is usually 1.0 to 1.3 t / m ³ . As another hydrophilic material, there is, for example, gelatin, and an aqueous solution thereof also undergoes gel-sol conversion due to a change in temperature, and thus can be used for the water-stopping material according to the present invention similarly to the agar aqueous solution. Agar is preferred because it is more likely to occur. The water-stopping material according to the present invention changes its form due to a change in temperature, that is, because the sol-gel changes its form, the strain leading to destruction is large, and a large impact deformation due to, for example, an earthquake or the like acts on it from the surroundings. Can be easily followed. Therefore, there is no problem that a crack is generated unlike a water stop portion due to injection of a chemical solution or filling of a filler in the related art. For reference, FIG. 4 shows the results of a uniaxial compression test of the agar gel (agar aqueous solution of 1 to 4%). It can be seen that the breaking strain is very large, 10% or more, and that it is rich in flexibility. In addition, the water-stopping material according to the present invention has good permeability in a sol state in a heated state, and thus has a good filling property in the ground in a heated state. Therefore, at the time of filling, mountain retaining wall material (for example, steel sheet pile),
If the ground or the aqueous solution of the water-stopping material is heated, good filling properties are guaranteed. As a method of heating the retaining wall material or the ground, a method of supplying hot air or hot water thereto, a method of inserting an electric heater and heating by heating can be adopted. The strength of the water-stopping material according to the present invention can be adjusted by changing the concentration of agar as shown in FIG. Further, the strength can be approximately doubled only by adding 0.2% of CMC. Therefore, the method of the present invention has good continuity in both the vertical direction and the horizontal direction, and has a flexible strength, and can be used as a permanent structure. Removal after use will be an easy waterproofing method. In addition, even after the implementation of the method of the present invention, if the effect of improving the water stoppage is insufficient, the re-penetration of the applied gelled material may be promoted, or the material may be re-injected. As described above, implementation is extremely easy.

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a retaining wall in which steel sheet piles are closely adhered to each other, are vertically driven into the ground, are filled with a waterproof material, and suppress earth pressure and water pressure from the side. FIG. 2 is a perspective view of a pile retaining wall in which horizontal piles of new piles are stacked horizontally in the ground, filled with a waterproof material, and suppressed in earth pressure. Fig. 3 shows that wooden piles are driven into the ground in close contact with each other, and the bottom is filled with water-blocking material to make it penetrate to form a bottom water-blocking wall. The perspective view of the retaining wall which filled the material and suppressed the earth pressure is shown. Example 1 As shown in FIG. 1, steel sheet piles 1... Were driven vertically into the ground G while engaging and connecting the connecting portions 1 ′. Next, the gap 3 between the steel sheet pile 1 of the retaining wall and the ground G
Then, a water stoppage material of an aqueous agar solution was poured in and solidified as follows. In particular, the water-stop material 2 was mainly supplied to the vicinity of the meshing connection portion 1 'of the steel sheet pile 1 and solidified to form a water-stop structure. The filling of the water stopping material 2 is performed not only on the front side of the steel sheet pile 1,
Although applied to the rear surface side, as shown in the figure, on the side surface of the ground G adjacent to the gap portion 3, the water-stopping material 2 penetrates into a certain range, and a water-stopping wall in a state where the ground and the water-stopping material are mixed is formed. Was. In the mixed portion, the solid particles constituting the ground were the core, resulting in the formation of a water-tight wall having high strength. (1) First, disperse 1% by weight of agar in water.
Prepare an aqueous agar solution by heating to ° C. (2) Then, 0.2% of carboxymethylcellulose (CMC) is added to and dissolved in the aqueous agar solution. In this method, an aqueous solution in which a required amount of CMC is dissolved may be added to the agar solution to form a mixed solution. (3) Then, the temperature of the agar aqueous solution is raised to the freezing point (30 to
40 ° C) or higher, using an injection pump to
And steel sheet pile 1. (4) Then, utilizing the fact that the temperature of the ground was about 15 ° C., the injected agar aqueous solution was naturally cooled and solidified to form a water-stop structure. By applying the steps (5), (3) and (4) to the other steel sheet piles 1 and so on, a continuous water blocking wall structure was constructed in the ground. The obtained ground stop water structure of the retaining wall was able to maintain good water stoppage without cracking even when a shock such as a large vibration was applied. 2nd Embodiment: As shown in FIG. 2, the parent pile 4 is driven vertically into the ground G at regular intervals, and then into the concave groove 4 ″ of the connecting portion 4 ′ of the parent pile 4 from above. Then, a mountain retaining wall was constructed by inserting 5 ... Then, a gap 3 between the horizontal sheet pile 5 of the mountain retaining wall and the ground G was formed.
And an agar-water-stopping material was poured into the groove 4 "of the connecting portion 4 'and solidified as described below. In particular, the groove 4" was formed.
The water-stopping material 2 was mainly supplied to the vicinity and solidified to form a water-stopping structure. The filling of the water stopping material 2 was performed not only on the front side of the parent pile 4 and the horizontal sheet pile 5 but also on the rear side, but as shown in FIG. Penetrated into a certain area, and a water-stop wall in a state where the ground and the water-stop material were mixed was formed. In the mixed portion, the solid particles constituting the ground were the core, resulting in the formation of a water-tight wall having high strength. (1) First, 1% by weight of agar is dispersed in water and heated to prepare an agar aqueous solution. (2) adding 3% of bentonite to the agar aqueous solution,
Cool slowly. (3) While keeping the temperature of the obtained agar aqueous solution-bentonite slurry constant (about 40 ° C.), the space portion 3 is injected and filled by a pressure pump. (4) By utilizing the fact that the temperature of the ground is about 15 ° C., the slurry is naturally cooled and solidified to construct a water blocking wall. By continuously performing the steps (5), (3) and (4), a continuous water stop wall is constructed. The obtained ground stop water structure of the retaining wall was able to maintain good water stoppage without cracking even in the case where a shock such as a large vibration was applied as in Example 1. Third Embodiment As shown in FIG. 3, prior to constructing a retaining wall made of wooden piles 6 in the ground G, a waterproofing material 2 is filled and infiltrated into a bottom portion 7 thereof to form a waterproofing wall 8. I do. Then, wooden piles 6 are vertically driven into the upper part thereof at regular intervals, and then a water-stopping material for agar aqueous solution is inserted into the gap 3 between the continuous portion 6 'of each wooden pile 6 and the ground G as follows. 2 was poured and solidified. In particular, the water-stopping material 2 is focused on the vicinity of the connection between the wooden piles 6
And solidified to form a water-stop structure. (1) First, 1% by weight of agar is dispersed in water and heated to prepare an agar aqueous solution. (2) Clay 3% is added to the agar aqueous solution, and the mixture is gradually cooled. (3) While keeping the temperature of the obtained agar-aqueous solution-clay slurry constant (about 40 ° C.),
The gap 3 is injected and filled. (4) By utilizing the fact that the temperature of the ground is about 15 ° C., the slurry is naturally cooled and solidified to construct a water blocking wall. By continuously performing the steps (5), (3) and (4), a continuous water stop wall is constructed. The obtained ground stop water structure of the retaining wall has a continuous waterproof wall 8 at the bottom 7 of the retaining wall, and as in the first and second embodiments, the water stopping wall has high strength. As a result, good water stoppage could be maintained without cracking.

【The invention's effect】

As described above, the water-stopping material according to the present invention has an extremely good filling property between the ground and the water-stopping wall. Becomes Therefore, even if a shock such as a large vibration is applied, a crack is not generated due to its flexibility, and good water stopping property can be maintained. The water-stopping material is non-polluting and does not impair the natural environment for animal and plant propagation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a retaining wall according to an embodiment of the present invention, FIG.
Fig. 3 is a perspective view of a retaining wall of another embodiment, Fig. 3 is a perspective view of a retaining wall of another embodiment, and Fig. 4 is a single axis of an agar aqueous gel waterproofing material (agar 1 to 4% aqueous solution). FIG. 5 is a graph showing the relationship between the shear strength of the agar gel waterproof material and the concentration of agar. 1: steel sheet pile, 1 ': connection part of steel sheet pile, 2: waterproof material, 3: gap, 4: parent pile, 4': connection part, 4 ": concave groove, 5: horizontal steel sheet pile, 6: Wooden pile, 6 ': Connection, 7: Bottom, 8: Water barrier, G: Ground

Continuation of the front page (72) Inventor Sumio Horiuchi 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) References JP-A-4-14522 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) E02D 5/02-5/20

Claims (6)

(57) [Claims] 1. A hydrophilic material, such as agar or gelatin, which melts and solidifies between a ground retaining wall material such as a steel pile, a wooden pile, and a horizontal sheet pile and the ground due to a temperature change in a temperature range from room temperature to about 100 ° C. A ground stop water method for retaining retaining walls, characterized by filling with a gelled material. 2. Between room temperature and 100.degree. C. between the periphery of the connecting portion of the unit body of the retaining wall material such as steel pile, wooden pile, horizontal sheet pile and the like and the ground.
A water retaining method for retaining a mountain retaining wall, characterized by filling a gel material of a hydrophilic material such as agar or gelatin which melts and solidifies due to a temperature change in a temperature range of about a degree. 3. A ground stop water for a retaining wall according to claim 1, wherein a fine powder of an inorganic material such as soil, clay and bentonite is added to and mixed with the gelled material of the hydrophilic material. Construction method. 4. The gelatinized hydrophilic material, wherein alpha starch,
The method according to any one of claims 1 to 3, wherein an organic paste such as CMC or protein is added and mixed. 5. A gelled hydrophilic material having a melting temperature of 80 to 50.
The method according to any one of claims 1 to 4, wherein the gel is a gel of an aqueous agar solution having a solidification temperature of 90 ° C and a solidification temperature of 30 to 40 ° C and a concentration of 0.2 to 4%. 6. The gelled hydrophilic material contains agar as a hydrophilic material and has a water permeability of 1 × 10 ⁻⁶ to 1 × 10 ⁻⁸ cm / sec when solidified by a decrease in temperature. 6. The method of suspending ground for a retaining wall according to any one of claims 1 to 5.