JPH11217824A - Execution method of underground impervious wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impervious wall facilitating the handling of a material, simplifying execution at a low construction cost and having high reliability of impervious efficiency as well as high quality. SOLUTION: Joint members 1... are erected at certain intervals in a continuous groove G excavated in the ground. Then, impervious panels 2... molded in the shape of a plate in advance are inserted between the joint members 1 and 1 while connecting the impervious panels adjoining up and down to each other with joint members of flexible material such as rubber, etc., and gaps between the joint members 1 and panels 2 are filled with grout 9 to construct an impervious wall in the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground impermeable wall construction method for constructing a continuous underground impermeable wall.

[0002]

2. Description of the Related Art Conventionally, the following methods are known as a method of constructing an underground impermeable wall.

(A) A continuous trench is excavated in the ground, and a solidifying material such as cement milk is injected into the continuous trench to mix and solidify with the in-situ soil, thereby constructing a horizontally continuous impermeable wall. Method (for example, JP-A-5-280043, JP-A-5-28
0044, JP-A-7-173835).

(B) A method of discharging in situ soil in an excavated continuous trench and placing concrete or reinforced concrete.

(C) A method of continuously inserting a roll-wound thin polymer sheet into a continuous groove while rewinding it.

[0006]

However, according to the method (a), the quality and composition of the in-situ soil,
According to the method (b), the quality (strength and water-blocking performance) of the water-blocking wall tends to vary depending on the precision of concrete casting. Further, according to the method (b), the construction is troublesome and the construction cost is high.

[0007] On the other hand, according to the method (c), although a certain quality is ensured, the sheet is liable to be damaged, and the handling is troublesome. It has not been put to practical use.

Accordingly, the present invention provides an underground impermeable wall capable of obtaining a high quality and highly reliable impermeable wall with easy handling of materials, easy construction, low construction cost, and high performance. The construction method is provided.

[0009]

According to the first aspect of the present invention, a joint member having a vertical connecting portion is installed in a laterally continuous groove excavated in the ground at a horizontal interval. The water-impervious panel formed in a plate shape in advance is inserted into the groove between adjacent joint members in a state where the side ends are connected by the connecting portion, and in a state where upper and lower adjacent ones are connected. To build a seepage barrier underground.

[0010] According to a second aspect of the present invention, in the method of the first aspect, after a plurality of joint members are built in the groove, a water-impervious panel is sequentially inserted between adjacent joint members.

According to a third aspect of the present invention, in the method of the first aspect, one of the two-sided joint members into which the impermeable panel is inserted is first built in the groove, and the impermeable panel is attached to the one joint member. Then, after one side is sequentially inserted in a state where one side is supported, the other joint member is built in the groove while the other side of the water-impervious panel is supported.

According to a fourth aspect of the present invention, in the method according to the first aspect, after one of the two side joint members into which the impermeable panel is inserted is first installed in the groove, the other joint member is installed in the groove. Meanwhile, a water impervious panel is inserted between both joint members.

According to a fifth aspect of the present invention, in the method of the first aspect, one of the two-sided joint members into which the impermeable panel is inserted is first built in the groove, and the other joint member is provided with a plurality of joints for each impermeable panel. It is divided into joint pieces and inserted into the groove while sequentially connecting the joint pieces and the impermeable panels.

According to a sixth aspect of the present invention, in the method according to any one of the first to fifth aspects, a joint member made of a flexible material such as rubber is provided between the mutually connected ends of the vertically adjacent water-blocking panels. The two impermeable panels are connected by mounting over the bridge.

According to a seventh aspect of the present invention, in the method according to any one of the first to sixth aspects, at least a gap formed between the joint portion of the joint member and the impermeable panel is filled with a grout material. .

In the invention according to claim 8, in the method according to any one of claims 1 to 6, a water-impervious panel is inserted between adjacent joint members on both front and rear sides with a space therebetween, and the grout material is removed. The space formed between the water-impervious panels on the front and rear sides and the connecting portion of the joint member and the space between the panels are filled.

According to a ninth aspect of the present invention, in the method of the seventh or eighth aspect, an expanding material containing water is used as the grout material.

According to a tenth aspect of the present invention, in the method of the ninth aspect, after the impermeable panel is inserted, the expandable material is injected into a gap between the joint portion of the joint member and the impermeable panel, and is expanded and filled. Things.

According to an eleventh aspect of the present invention, in the method of the ninth aspect, the expandable material is mounted on at least one of the connecting portion of the joint member and the water-impervious panel, and is expanded after the water-impervious panel is inserted.

According to the above-mentioned method, the quality of the constructed impermeable wall and the impermeable performance depend on the quality of the impermeable panel, the impermeable property, and the connection state of the impermeable panels. Therefore, as long as these conditions are satisfied, high quality and highly reliable water shielding performance can be easily obtained.

Further, since there is no possibility of breakage as in the case of a thin sheet and it is only necessary to insert the water-impervious panel formed in advance to an appropriate size and weight into the groove while connecting, the material can be easily handled. Construction is simple and construction costs are low.

In this case, according to the method of the second aspect, after all the joint members are built in the groove, it is only necessary to insert a water-impervious panel between the joint members. Will be better.

On the other hand, according to the method of the third, fourth and fifth aspects, the impermeable panel cannot be inserted due to the irregularity of the interval between the joint members due to the variation in the verticality of the joint member as in the method of the second aspect. Therefore, there is no possibility of causing a trouble that a useless gap is generated between the panel and the joint member, and the reliability of the construction is high.

Further, according to the method of the present invention, since the upper and lower water-impervious panels are connected to each other by a joint member made of a flexible material such as rubber, the joint member may be subject to uneven settlement or floating due to an earthquake or the like. By exhibiting the ability to follow the ground displacement, it is possible to prevent a large deformation or breakage of the impermeable wall and a decrease in the impermeable performance due to this.

Further, according to the method of the present invention, the sealing property of the connecting portion is ensured by the grout material filled in the gap between the connecting portion of the joint member and the impermeable panel, and the entire impermeable wall is shielded. Water performance can be improved.

Further, by using a solidifying material for the grout material, it is possible to increase the connection strength between the joint member and the water-impervious panel, to strengthen the fixing force of the water-impervious panel, and to build a more robust impermeable wall as a whole. it can.

On the other hand, according to the method of the present invention, since the water-impervious panels are inserted into the front and rear sides between the adjacent joint members, the weight per panel can be reduced, and the handling and insertion work of the panels becomes easy. .

In addition, by filling the gap formed between the two panels and the connecting portion of the joint member and the grout material between the two panels, the substantial thickness of the impermeable wall is increased, and the impermeable effect is improved. It can be further improved.

Further, according to the method of the ninth aspect, in which an inflatable material is used as the grout material, the gap can be securely filled and the sealing performance of the connecting portion can be improved as compared with the case where a non-expandable material is used.

In this case, according to the method of claim 10, since the expansive material is not filled when the impermeable panel is inserted, the expansive material does not become a resistance for panel insertion, and the work efficiency is improved.

According to the eleventh aspect, since the expansible material is set at the same time as the impermeable panel is inserted, the construction efficiency is higher than in the case where the expansible material is injected after the impermeable panel is inserted.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction procedure according to this embodiment will be described.

I. Ditch Excavation As shown in FIG. 1, a continuous ditch G having a predetermined width, depth and length is excavated in the ground.

Excavation of the groove G is performed by an appropriate method such as a method using a known chain type cutter, a method using a bucket type continuous excavator, a method using a multi-shaft rotary (mill type) excavator, or the like.

FIG. 1 exemplifies a method using a chain type cutter. In the state where the chain type cutter B attached to the traveling vehicle A is buried in the ground, the same type of cutter B is used.
The continuous groove G is excavated in the ground by laterally moving while rotating in a predetermined direction (for example, see Japanese Unexamined Patent Publication No. 5-280).
No. 043, JP-A-5-280044, JP-A-7-17
3835 publications).

When there is a possibility that the continuous groove G collapses, the inside of the groove is filled with a stable solution such as a bentonite solution, and the groove wall is held.

II. As shown in FIG. 2, the joint members 1 are installed in the excavated continuous groove G at regular intervals in the lateral (groove length) direction.

In this embodiment, an H-shaped steel material is used as the joint member 1 as shown in FIGS.
The concave grooves 1a, 1a on both sides thereof serve as connecting portions for connecting the impermeable panel.

In order to hold and fix the joint members 1 vertically, the lower end of the joint members 1 may be fixed to the bottom of the continuous groove by cement or the like.

III. Panel insertion As shown in FIGS.
A large number of water-impervious panels 2 are sequentially inserted into one while being connected to each other vertically adjacent to each other.

The water-blocking panel 2 is formed in advance into a plate having a predetermined thickness and size with a material having water-blocking properties, for example, a precast concrete plate.

The vertical and horizontal dimensions and thickness of the panel 2 and its weight are determined in consideration of the convenience of transportation and handling during construction.

The water-impervious panels 2 are suspended on the already inserted panel by using, for example, a crane or a gantry C shown in FIG. 4, and both right and left ends thereof are joint members as shown in FIGS. 1 and 1 are inserted between the joint members 1 and 1 while being fitted into the concave grooves 1a and 1a.

At this time, the upper and lower panels 2 and 2 are connected to each other by a joint member 3 made of a flexible material such as rubber over the entire width of the joint end.

As shown in FIG. 6, the joint member 3 is formed by integrally connecting connecting portions 5 and 5 on both upper and lower sides with a cushion portion 4 provided with appropriate elasticity therebetween. , 5 are fitted into connecting grooves 2a, 2a having a keyhole-shaped cross section provided over the entire joint end surfaces of the panels 2, 2.

Thus, the joint member 3 is connected to both panels 2 and 2
The panels 2 are connected to each other by the same member 3.

The two connecting portions 5 are provided with connecting grooves 2.
The barbed protrusions 5a are provided to prevent the a and 2a from coming off.

The tip portions of both side connecting portions 5, 5 are fixed in the connecting groove 2a by the grout material 5b. However,
The grout material 5b may not be injected and fixed to the connection groove 2a only by the anchor effect at the tip of the connection portion.

The panels 2 inserted between the joint members 1 and 1 are lowered by their own weight or are pushed in by applying pressure from above.

Alternatively, as shown in FIG. 4, the joint members 1, 1 may be pulled down by the ropes 6, 6 as reaction force receiving members.

In FIG. 4, reference numerals 7 and 7 denote ropes 6 and 6 on a gantry C.
Are sheaves for guiding the ropes 6, 6.

IV. After the completion of the insertion of the grout material injection panel, a grout material 9 such as cement or a mixture of cement and bentonite liquid is injected and filled into an excess space in the concave groove 1a of each joint member 1 as shown in FIG.

The grout material 9 may be a solidified material or a non-solidified material. In the case of solidified material, wait for solidification after injection.

The grout material 9 fills an extra gap in the concave groove 1a to enhance the sealing property. In addition, when the solidifying material is used, the fixed state of the panel 2 to the joint member 1 can be strengthened.

In FIG. 7, reference numerals 10... Denote partition plates for preventing the grout material 9 from leaking. The partition plates 10...

According to the above procedure, a large number of impermeable panels 2...
Water barrier can be constructed underground.

Other Embodiments (1) As the grout material 9, an expandable material such as powdered bentonite (a material that expands when water is added) can be used.

In this case, the following method can be specifically used.

(A) After the panel is inserted, an unhydrolyzed (powder) expandable material is placed in the concave groove 1a of the joint member 1, and expanded by adding water.

(B) As shown in FIGS. 8 and 9, the non-hydro swellable material 9 'is wrapped and arranged in the side edge of the panel 1 or in the joint member groove 1a, and the panel insertion is completed. Then, after the wrapper 11 is removed, water is added to expand the package.

Alternatively, a paper material or the like which is easily torn may be used for the package 11, and the package 11 may be broken and expanded by the expansion pressure of the material 9 '.

(2) As shown in FIGS. 10 and 11, water-impervious panels 2 and 2 are inserted in parallel between the adjacent joint members 1 and 1 on both front and rear sides with a space therebetween.

The left and right end portions 2 of the two impervious panels 2
b, 2b are formed in a concave shape that fits into the front and rear flanges 1b, 1b of the joint members (H-section steel) 1, 1, and a fitting portion between the concave ends 2b, 2b and the flange 1b, and a connecting groove 2a are formed. The grout material 9 is filled in the surplus space and between the front and rear panels.

10 and 11, reference numerals 12 ... denote partition members for preventing the grout material 9 from leaking from the fitting portion between the joint member outer flange 1b and the panel concave end 2b.

According to this method, since the weight per panel 2 can be reduced, the handling and insertion work of the panel 2 becomes easy.

Further, since a composite panel structure is formed by the side panels 2 and 2 and the grout material 9, the substantial thickness of the impermeable wall can be increased, so that the impermeable effect is higher.

In the method of inserting a single impermeable panel 2 between adjacent joint members as in the basic embodiment, a method of filling the grout material 9 into the continuous groove G on both front and rear sides of the panel 2 is described. However, according to this method, when there is a cavity such as a stalactite cave or a groundwater flow in the underground portion of the impermeable wall construction point, the grout material 9 flows out of the ditch, and the grout material 9 is wasted. And problems such as water pollution occur.

On the other hand, according to the method of filling the grout material 9 between the front and rear panels 2 and 2 as described above, there is no possibility of the grout material 9 flowing out.

(3) In addition to the above embodiment, the following construction method can be adopted.

(I) As shown in FIGS. 12 (a) to 12 (d), both side joint members 1, into which the impermeable panel 2 is inserted,
One of the joint members 1 is first inserted into the groove, and the water-impervious panel 2 is inserted into the joint member 1 that has been previously inserted while the panels are sequentially connected to each other in a state where one side is supported, and then the other joint member is inserted. 1 is built in the groove while the other side of the impermeable panels 2 is supported.

(Ii) As shown in FIGS. 13 (a) to 13 (d), both-side joint members 1 into which the impermeable panel 2 is inserted
After one of the joint members 1 is first installed in the groove, the water-impervious panels 2 are inserted between the two joint members 1 while connecting the other joint members 1 together.

(Iii) As shown in FIGS. 14 (a) to (d), the two-sided joint members 1 into which the impermeable panel 2 is inserted.
1 is first built in the groove, and the other joint member 1 has a plurality of joint pieces 1
And inserted into the groove while sequentially connecting the joint pieces and the impermeable panels.

In this case, after connecting the upper and lower joint pieces 1 ′ and 1 ′, the panel 2 may be inserted, or the joint piece 1 ′ and the panel 2 may be connected in advance.

[0074]

As described above, according to the present invention, preformed water-impervious panels are connected to each other vertically adjacent to each other in a continuous groove excavated in the ground, and are connected by a joint member in the horizontal direction. In order to construct the impermeable wall in the ground by inserting while inserting, the quality of the impermeable panels, the impermeableness, and the connection state of the impermeable panels are properly managed, so that high quality and highly reliable Water performance can be easily obtained.

Further, since there is no possibility of breakage as in a thin sheet and it is only necessary to insert a water-shielding panel formed in a suitable size and weight in advance while connecting the grooves, the material can be easily handled. Construction is simple and construction costs are low.

In this case, according to the method of the second aspect, after all the joint members are built in the groove, it is sufficient to insert the water-impervious panel between the joint members, so that the process is simple and the construction efficiency is low. Will be better.

On the other hand, according to the method of the third, fourth and fifth aspects, the impermeable panel cannot be inserted due to the irregularity of the interval between the joint members due to the variation in the verticality of the joint member as in the method of the second aspect. In addition, there is no possibility of causing a trouble that a useless gap is generated between the panel and the joint member, and the reliability of construction is high.

Further, according to the method of claim 6, since the upper and lower water-impervious panels are connected to each other by a joint member made of a flexible material such as rubber, the joint member may be subject to uneven settlement or floating due to an earthquake or the like. By exhibiting the ability to follow the ground displacement, it is possible to prevent a large deformation or breakage of the impermeable wall and a decrease in the impermeable performance due to this.

According to the method of claim 7, the sealing property of the connecting portion is ensured by the grout material filled in the gap between the connecting portion of the joint member and the impermeable panel, and the entire impermeable wall is shielded. Water performance can be improved.

Further, by using a solidifying material for the grout material, it is possible to enhance the connection strength between the joint member and the impermeable panel, to enhance the fixing force of the impermeable panel, and to build a more robust impermeable wall as a whole. it can.

On the other hand, according to the method of claim 8, since the water-impervious panels are inserted into the front and rear sides between the adjacent joint members, the weight per panel can be reduced, and the handling and insertion work of the panels becomes easy. .

In addition, by filling the gap formed between the two panels and the connecting portion of the joint member and the grout material between the panels, the substantial thickness of the water-impervious wall is increased, and the water-impervious effect is improved. It can be further improved.

According to the method of the ninth aspect, in which an intumescent material is used as the grout material, the gap can be securely filled and the sealing performance of the connecting portion can be improved as compared with the case of using a non-expandable material.

In this case, according to the method of the tenth aspect, since the expansive material is not filled when the impermeable panel is inserted, the expansive material does not become a resistance for panel insertion, and the work efficiency is improved.

According to the method of the eleventh aspect, since the expandable material is set at the same time as the impermeable panel is inserted, the construction efficiency is higher than when the inflatable material is injected after the impermeable panel is inserted.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a state where an underground continuous trench is excavated in an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a state where a joint member is erected in a continuous groove that has been excavated.

FIG. 3 is a schematic cross-sectional view of a stage of inserting a seepage control panel between joint members.

FIG. 4 is a partially enlarged cross-sectional view during panel insertion.

FIG. 5 is a partially enlarged perspective view during insertion of a panel.

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a horizontal cross-sectional view of a completed construction state.

FIG. 8 is a cross-sectional view showing an example of using an expandable material for a grout material as another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing another example of use of the expandable material.

FIG. 10 is a horizontal cross-sectional view of a case where water-impervious panels are inserted on both front and rear sides between adjacent joint members as still another embodiment of the present invention.

FIG. 11 is a partially enlarged view of FIG. 10;

12 (a), (b), (c) and (d) are schematic sectional views showing a first example of a method according to another embodiment of the present invention.

13 (a), (b), (c) and (d) are schematic sectional views showing a second example of a method according to another embodiment.

FIGS. 14 (a), (b), (c) and (d) are schematic sectional views showing a third example of a method according to another embodiment.

[Explanation of symbols]

 G Underground continuous groove 1 Joint member 1a Concave groove as a joint of joint member 2 Waterproof panel 3 Joint member made of flexible material 9 Grout material 1 '... Joint piece

Continued on the front page (72) Inventor Minoru Aoi 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Co., Ltd. Tokyo Head Office (72) Inventor Fumio Kinoshita 1-82-2 Marunouchi, Chiyoda-ku, Tokyo Kobe Steel, Ltd. Tokyo headquarters (72) Inventor Keiki Ashida 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Co., Ltd. Kobe Steel Ltd. Tokyo headquarters

Claims (11)

[Claims] 1. A joint member having a vertical connecting portion is erected at a horizontal interval in a laterally continuous groove excavated in the ground, and is formed into a plate-like water barrier. A panel is inserted between adjacent joint members in a groove in a state in which side end portions are connected by the connecting portion, and in a state where upper and lower adjacent ones are connected to each other to form a water impervious wall in the ground. An underground impermeable wall construction method characterized by being constructed. 2. The method for constructing an underground impermeable wall according to claim 1, wherein the plurality of joint members are installed in the groove.
A method of constructing an underground impermeable wall, comprising sequentially inserting impermeable panels between adjacent joint members. 3. The underground impermeable wall construction method according to claim 1, wherein one of the two side joint members into which the impermeable panel is inserted is first built in the groove, and the impermeable panel is connected to the one joint. An underground impermeable wall, wherein the other joint member is buried in a groove while the other one side of the impermeable panel is supported, after being sequentially inserted with one side supported on the member. Construction method. 4. The method for constructing an underground impermeable wall according to claim 1, wherein one of the two side joint members into which the impermeable panel is inserted is first built in the groove, and then the other joint member is installed in the groove. A method of constructing an underground impermeable wall, comprising inserting a impermeable panel between both joint members while building the underground. 5. The method for constructing an underground impermeable wall according to claim 1, wherein one of the two side joint members into which the impermeable panel is inserted is first built in the groove, and the other joint member is provided along with the impermeable panel. A method of constructing an underground impermeable wall, comprising dividing the joint piece into a plurality of joint pieces and sequentially inserting the joint pieces and the impermeable panels into the groove. 6. The underground impermeable wall construction method according to any one of claims 1 to 5, wherein a joint member made of a flexible material such as rubber is phase-connected to vertically adjacent impermeable panels. A method of constructing an underground impermeable wall, comprising connecting both impermeable panels by mounting the end between end portions. 7. The method of constructing an underground impermeable wall according to claim 1, wherein at least a gap formed between a joint of the joint member and the impermeable panel is filled with a grout material. A method of constructing an underground impermeable wall, characterized in that: 8. The method of constructing an underground impermeable wall according to any one of claims 1 to 6, wherein impermeable panels are inserted between adjacent joint members on both front and rear sides with an interval therebetween. It is characterized in that a grout material is filled between the front and rear water-impervious panels and the joint portion of the joint member and between the two panels. 9. The underground impermeable wall construction method according to claim 7, wherein an inflatable material that expands with moisture is used as the grout material. 10. The underground according to claim 9, wherein an expandable material is injected into a gap between the joint portion of the joint member and the water-impervious panel after the water-impervious panel is inserted, and expanded and filled. Construction method of impermeable wall. 11. The underground impermeable wall according to claim 9, wherein the inflatable material is mounted on at least one of the connecting portion of the joint member and the impermeable panel, and is expanded after the impermeable panel is inserted. Construction method.