JP2779879B2 - How to construct a suspended water wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a continuous water stop wall constructed underground as a water stop wall, a continuous water stop wall for dams, a harmful substance spill prevention wall, etc. in construction work.

[0002]

2. Description of the Related Art As a method of constructing a water blocking wall in the ground, there is an underground continuous water blocking wall construction method which has been frequently used in recent years.
This underground continuous water blocking wall method uses a high-pressure jet to form a groove in the ground, injects asphalt emulsion and cement-based hardening material into the space, a method of ground improvement, and also to protect the groove wall While using a bentonite stabilizer, etc., after excavating a groove of a predetermined depth in the ground, asphalt emulsion, cement-based hardening material or the like is poured into the excavation groove, or a hardener is introduced into the stabilizer. There is a method of constructing a continuous water blocking wall in the ground by natural curing or the like.

However, in order for a wall constructed by the above-described continuous water blocking wall method to function sufficiently as a water blocking wall, cracks and the like do not occur in the wall and the watertight structure of the joint portion is excellent. However, in practice, complete waterproofness cannot be expected over a long period of time due to uncertainties in construction, excessive stress cracks due to earthquakes, etc. The continuous waterproof wall construction method used is adopted. In recent years, as a continuous water blocking wall construction method developed, for example, Japanese Unexamined Patent Publication No.
JP-B-61-49451, JP-A-63-3048
JP-A-21, JP-A-56-85018, JP-A-56-85018
There is one described in JP-A-3-522.

[0004]

However, in the continuous water blocking wall construction method using the water blocking sheet, a single water blocking sheet is mainly built in the excavation trench, and the hardening agent is filled on the front and back sides thereof. However, there are various problems in construction when installing the waterproof sheet. For example, when the water-stop sheet is built in the stabilizing liquid, the water-stop sheet cannot be lowered by its own weight. Therefore, as in the invention described in Japanese Patent Application Laid-Open No. 56-85018, a support or the like is attached to both ends to form the water-stop sheet. A method of performing a descent has been proposed. In this case, after the column is once suspended by a crane or the like, the column is built vertically, but there is a limit to the width of the seat that can be accurately built.
Further, as described in Japanese Patent Application Laid-Open No. 63-304821, a method has been proposed in which a water-stop sheet is stretched between a plurality of columns in a state where the sheets are laterally compactly assembled. However, when the excavation depth is large, it is difficult to accurately stretch the compact waterproof sheet.

On the other hand, when constructing a continuous wall, construction is carried out in units of predetermined blocks (elements) in the excavation groove sequentially, but various problems occur in relation to the wall stabilizing liquid to be used. If the bentonite stabilizing solution is used, the bentonite stabilizing solution is contaminated by calcium ions of the hardening agent when excavating the next unit adjacent to the unit already hardened by the cement hardening agent. Deteriorates, causing the collapse of the wall surface, increasing the amount of waste liquid, and also causing bentonite to adhere to the wall surface and joints of the already cured adjacent units, resulting in the formation of unconsolidated parts, which causes water leakage. And other problems. Furthermore, since the gel viscosity and specific gravity increase due to the deterioration of the bentonite stabilizer, there are problems that the excavation efficiency is reduced, and that the classification of the sludge, the installation of the waterproof sheet, and the solidification are difficult.

In addition, when a self-hardening stabilizer is used, various operations such as excavation and installation of a waterproof sheet are restricted due to restrictions on the hardening time. The specific gravity increases, and the above-mentioned problem similarly occurs. Further, when a polymer stabilizer is used, there is a problem that it is difficult to cure itself. On the other hand, when connecting between waterproof sheets, it must be built and connected with the waterproof sheet open.
This connection work is difficult and requires much labor and time.

Accordingly, a main object of the present invention is to eliminate the deterioration of the stabilizing solution to be used and to solve various problems caused by the deterioration of the stabilizing solution.
An object of the present invention is to provide a method for constructing a continuous water blocking wall which facilitates connection work and has excellent workability and water blocking property.

[0008]

The object of the present invention is to form an excavation groove in the ground using a wall stabilizing liquid, and the excavation groove has a length substantially equivalent to the groove depth, A movable trolley provided with a connecting member on one side of the bag after a bag made of a liquid-impervious sheet having a connecting member on each of both sides thereof is built in a contracted state, and the connecting member on one edge side of the bag is disposed on the ground portion. In a state where the bag is suspended and supported, a filler is injected into the inside of the bag, and the one side is moved along the digging groove by swelling of the bag, and the inside of the digging groove is covered with a liquid-impermeable sheet. The problem can be solved by forming a wrapped waterproof wall. Further, regarding the movement control of the one side edge, a cord-shaped member having one end fixed to a lower end portion of a connection fitting on one edge side of the bag body and the other end extending to the ground by turning a connection fitting portion on the other end edge side. In addition, a slime suction pipe is provided on the connecting metal fitting on the moving edge side of the bag body in order to save labor for removing the slime.

[0009]

The bag used in the present invention is made of a liquid-impermeable sheet. In order to stop the water in the entire depth range of the excavated portion, a bag having a length equivalent to the groove depth is used. At the time of installation into the excavation groove, the bag body is contracted and inserted in a compact and solidified state, so that it is possible to easily install the bag body and the connection work thereof can be easily performed. . When the installation is completed, a filling material is injected into the inside of the bag body to form a water blocking wall covered with a liquid-impermeable sheet in the excavation groove. At the time of bulging of the bag body, the connecting metal fitting on one edge side of the bag body is supported in a suspended state by the movable cart disposed on the ground portion, so that the bag can be easily moved by injecting the filler into the bag body. At the same time, verticality is always ensured during the movement process. The inflation force of the bag body can be adjusted by adjusting the injection pressure of the filler or the like, but by providing the cord-like member, the movement of the connection fitting on the moving edge side is restricted, and the verticality during movement is maintained. And the amount of movement can be measured.

On the other hand, the filler injected into the bag body is completely separated from the wall stabilizing liquid used for excavation and does not mix with each other. Various problems are solved.
In addition, since the filler can perform quality control on the ground, strength and quality can be arbitrarily adjusted, and slime and the like are not mixed, so that a waterproof wall having desired quality can be constructed. Become.

Further, in the case of the conventional construction method, a wall is constructed by filling a grout material, adding a curing agent to a wall surface stabilizing liquid and hardening the same, or waiting for the self-hardening stabilizing liquid to harden. Because of this, excavation could not be performed until the adjacent element had a predetermined strength, but in the case of the method of the present invention, the bag is filled with filler, Since there is no restriction, continuous work can be performed, and it is not necessary to set up an interlocking pipe or the like, and the work is made more efficient. In addition, by providing a slime suction pipe in the connecting metal fitting on the moving edge side of the bag body, it is possible to remove the slime accumulated at the bottom of the excavation groove together with the swelling of the bag body. Can be achieved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 is a view showing a state in which a liquid-impermeable bag 1 according to the present invention is built, FIGS. 2 and 3 are structural views of the bag 1, and FIG. FIG. The liquid-impervious bag 1 used in the method of the present invention has a length substantially equivalent to the depth of the excavation groove, and a polyethylene sheet,
It is a rectangular parallelepiped bag made of a plastic sheet such as a nylon sheet or a canvas sheet, or an appropriate liquid-impervious sheet such as a synthetic rubber. At the time of installation, as shown in FIG. Folded and inserted in a contracted state. Male and female connecting fittings 2a and 2b are fixed to the side portions, respectively. Preferably, the connecting fittings 2a and 2b are made of steel, so that the connecting fittings 2a and 2b serve as a core material of the bag body 1 and function as weights, thereby facilitating transportation and installation. A plurality of cells 1 </ b> A to 1 </ b> A are arranged inside the bag body 1 by partition walls 1 a to 1 e arranged in the groove width direction in the direction of the completed construction state.
It is divided into 1F. For example, as shown in FIG. 6, the partition walls 1a to 1e prevent the bag body 1 from bulging in the groove width direction when the ground is soft or relatively weak, as shown by a broken line. Bag 1 even after injection
Are provided so as to maintain a rectangular shape. In addition, in the ceiling sheet portion of each of the cells 1A to 1F, injection holes 1f, 1f... Are formed, respectively, and when the filler is injected into all the cells 1A to 1F, the shape shown in FIG. Become. The dimensions B and cell splitting of the bag 1 are determined after careful consideration of the workability, the construction process, the extension of construction per day, and the like. In addition, the said partition 1a-1e does not need to be the sheet | seat material which completely separates each cell 1A-1F as shown in FIG. 3 from the above-mentioned meaning, and about the partition 1a, 1c, 1e as shown in FIG. May be, for example, a net-like sheet or a connecting member provided at an appropriate interval so as to allow circulation between cells.

In constructing the ground suspension water wall, a pair of guide walls 4 and 4 are used to form a groove in accordance with a general groove excavation procedure in accordance with a rule for digging, protection of a hole wall, prevention of outflow of a stabilizing solution, and the like. After sandwiching and laying, the trench excavation is performed while filling the inside of the excavation trench 6 with the wall surface stabilizing liquid 5 using an appropriately selected excavator such as a bucket type, an impact type or a rotary type. In the excavation, since the method of the present invention can continuously perform the construction without waiting for the hardening of the adjacent wall, the excavation order is not limited at all, and the excavation can be performed continuously in one direction.

Next, the bag 1 is erected from the portion where the trench excavation is completed. At the time of building, as shown in FIG. 1, the bag body 1 is suspended by a heavy machine (not shown) such as a crane brought to the site, and is built vertically as it is. At that time, the installed waterproof wall W
The female connector 2b of the built-in bag 1 is fitted to the male connector 2a fixed to the side end of (1 '), and the female connector 2b is hung as a guide.

After the bag 1 has been set up, the filling material is injected according to the procedure shown in FIG.
If the wall extends in the right direction of the drawing,
As shown in (c), the leftmost cell 1A of the bag 1 is filled. The cell 1 </ b> A expands with the injection of the filling material, and pushes out the right side of the bag 1 from the groove 6. Next, as shown in FIG. 4D, the filler is injected into the cells 1B and 1C sequentially from the left cell, and the filler is extended to the right side of the groove 6, and the space between one element is changed as shown in FIG.
As shown in (2), the water blocking wall W covered with the liquid impermeable sheet is constructed.

As shown in FIG. 5, when the male connecting fitting 2a is moved along with the injection of the filler, the male connecting fitting 2a is supported by a movable carriage 20 which is movable along the guide fall 4 so as to be held. Becomes easier. The carriage 20 has wheels 22 on a carriage 23,
The male fitting 2a of the bag body 1 is movable along rails 21 having concave grooves placed on the guide fall 40 and supported by a supporting fitting 23a fixed to the moving table 23.
Is supported in a suspended state to facilitate the movement of the male connection fitting 2a due to the expansion of the bag body 1,
Always keep it vertical when moving.

As the filler to be injected into the bag 1, for example, asphalt emulsion, cement-based milk, mortar, concrete and the like can be suitably used. If so, liquids such as water, waste liquid, sand, and granular materials can be used. Furthermore, in order to reduce the amount of industrial waste, the bag 1 can be filled with the replacement of the bentonite stabilizing solution used during excavation as it is or by mixing a hardener. The injection may be performed by pouring or by press-fitting with a predetermined pressure.

Here, paying attention to the connection procedure of each water blocking wall W, as shown in FIG. 1 described above, in addition to the method of connecting to the completed bag 1 'at the time of building, a plurality of bags are previously set on the ground. Body 1,
After connecting 1..., They can be built together in the groove. At an appropriate time when the injection into the bag body 1 is completed, the longitudinal grooves 6a, 6a,.
, A cement-based filler or a hardening agent or the like is charged to achieve solidification. As shown in FIG. 10, the fitting gap between the connecting fittings 2a and 2b may be filled with an inflatable rubber 3 or the like to ensure the waterproofness.

The bag 7 shown in FIGS. 7 and 8 can be used under the condition that the construction depth of the water blocking wall is shallow or the ground is relatively strong. The bag body 7 is a rectangular bag body having no partition member such as a partition wall.
And the ceiling sheet portion has an injection hole 7
a, it is folded in a bellows shape as shown in FIG. 7 at the time of installation, and inserted in a contracted state. The construction procedure is performed according to the same procedure as that of the bag 1.

The connecting fittings fixed to both sides of the bag are not limited to those described above, and for example, the following fittings are preferably used. For example, in the specific example of FIG. 11, the connecting arms 11a and 11
b (12a, 12b) is provided with a protective steel member 11 (12) having a U-shaped cross section fixed thereto, and the specific example shown in FIG. , H-shaped sheet piles 14, 15 with one side of the flange cut off
It is an example provided with. The protective steel materials 11 and 12 and the H-shaped sheet piles 14 and 15 function as weights when the bags 10 and 13 are installed, and facilitate installation. Also,
As a result, the vertical surfaces of the side edges of the bags 10 and 13 on the extension side are secured, and the connection is facilitated. In addition, the water stopping process can be easily performed by pouring a solidified material or the like into the closed space after the connection.

On the other hand, in constructing the water blocking wall, it is necessary to remove the slime after excavation. However, as shown in FIG. 9, the clamshell bucket 9 removes the slime S at an adjacent portion of the bag 1. When performing the removing operation while protecting the built-in bag 1 with the protective steel material 8 having a U-shaped cross section, the operation can be performed without damaging the bag 1. The protective steel material 8 can be used also as a jig at the time of building. Further, in the slime treatment, the slime suction pipe 16 and the slime suction pipe 16 and
13, the slime S deposited on the bottom of the excavation groove can be sucked up and removed together with the movement of the connection fitting 11 (14) accompanying the filling of the bag body 1 as shown in FIG. Thus, working substantially slime removal is labor saving, thereby improving the working efficiency.

On the other hand, the bag 1 accompanying the injection of the filler
To explain the lateral movement for, as shown in Figure 15, when the specific gravity of the wall stabilizer 5 that is filled in the groove 6 and gamma _s, the pressure distribution in the depth direction is represented by gamma _s · H You. On the other hand, assuming that the specific gravity of the filler injected into the bag 1 is γt, the pressure distribution in the depth direction is similarly represented by γt · H. Here, the specific gravity of the bentonite liquid usually used as the wall stabilizing liquid is in the range of about 1.15 to 1.25, and when the filler is a cement-based filler or the like, it is 1.30 to 1.7.
Since the range of about 0, so that the extruding force by the difference in specific gravity (γt-γ _s) · H acts as a pressure ΔP in the extrusion direction. Therefore, by using the additional pressure due to the difference in specific gravity, the injection pressure, and the like as necessary, it is thought that it is possible to sufficiently push out to the side. In some cases, if the injection is performed in a state where the upper end A of the bag 1 is moved and constrained by any method in a timely manner, the pressure at the lower end can be increased, and the movement can be facilitated. it can. As described above, the use of the moving device shown in FIG. 5 naturally facilitates the movement.

As means for regulating the amount of movement of the lower end side of the connecting metal fitting 11 (14) on the moving side, for example, FIG.
As shown in FIG. 2, one end is fixed to the lower end portion of the connection metal fitting 11 (14) on the moving edge side, and the other end is extended to the ground by turning the substantially same height position of the connection metal fitting 12 (15) on the fixed edge side. For example, a cable-like member 17 such as a wire rope or a fiber rope is provided, and the movement of the moving-side connection fitting 11 (14) can be regulated by the cable-like member 17 to maintain the verticality during the movement. When detecting verticality,
A rope extension length detecting means 19 is provided on the ground portion of the cord-like member 17 to measure a distance l ₀ between the fixed-side connecting member 12 (15) and the moving-side connecting member 11 (14),
It is possible to perform measurement inspection of verticality by the relative difference between the distance l ₁ of the connecting member upper end. The feeding length detecting means 19 may include a rotating body 19a which abuts on the cord-like member 17 and rotates in accordance therewith, a rotary encoder for detecting the amount of rotation of the rotating body 19a, and a pulse counter for the output thereof. Note that a cord-like member 18 may also be provided on the upper end side of the connection fitting 11 (14), and similarly, movement of the upper end side and detection of the movement distance may be performed.

Now, the way of folding the bag 1 will be described. FIG. 16 and FIG. 17 show the most common folding method (first concrete example) as adopted in the above-described concrete example. FIG. 18 and FIG. 19 show a modified example (second specific example). In the first specific example, the side wall portions of the bag body 1 are folded in a bellows shape with the fold lines of ridges and valleys arranged symmetrically, and the bottom portion of the bag body 1 is folded along the valley line along the bent lines of the side wall portions. The extension direction is the longitudinal direction of the bag 1. In the case of the first specific example, since the width B in the folded state and the width B in the expanded state are almost the same, it is necessary to perform the production from the beginning according to the excavation width. This point is improved in the second specific example. FIG. 18 shows a folded state, and FIG. 19 shows a state in a bulging process. In the second specific example, each of the blocks is folded in a V-shape by setting the fold points P, P... To a slightly eccentric position. Since the width is increased in the width direction, it is possible to cope with a change in the excavation groove.

[0025]

As described in detail above, according to the present invention, it is possible to eliminate the deterioration of the stabilizing solution used and to solve various problems caused thereby. In addition, the installation and connection work of the water stop sheet becomes easy, and a water stop wall excellent in workability and water stoppage can be constructed.

[Brief description of the drawings]

FIG. 1 is an installed state diagram of a bag 1 according to the method of the present invention.

FIG. 2 is a contracted view of the bag 1;

FIG. 3 is a view showing a filling state of a filling material of the bag 1;

FIG. 4 is a construction procedure diagram after a bag is built.

FIG. 5 is a view showing a support structure of a moving-side connection fitting.

FIG. 6 is a diagram illustrating the function of a partition.

FIG. 7 is a contracted view of a bag having a one-cell structure.

FIG. 8 is a view showing a filling state of a filler in a bag having a one-cell structure.

FIG. 9 is a diagram showing a bag protection state during slime treatment.

FIG. 10 is a detailed view of a structure of a bag connecting portion.

FIG. 11 is a contracted view of a bag provided with another connection fitting.

FIG. 12 is a contracted view of a bag provided with another connection fitting.

FIG. 13 is a slime treatment procedure chart according to the present invention.

FIG. 14 is a view showing a mounting structure of a cable member for movement control of a moving-side connection fitting.

FIG. 15 is an explanatory diagram of a lateral movement procedure of the bag body.

FIG. 16 is a side view for explaining a first specific example of the folding method.

FIG. 17 is a sectional view taken along line AA of FIG. 16;

FIG. 18 is a contracted view for explaining a second specific example of the folding method.

FIG. 19 is a swelling state diagram of the second specific example of folding.

[Explanation of symbols]

1.7 bag, 1a to 1e partition, 1f injection hole, 2a
・ 2b: Connection fitting, 4: Guide wall, 5: Wall stabilizing liquid, 6: Drilling groove, 8: Protective steel, 9: Clamshell bucket

Claims (3)

(57) [Claims] An excavation groove is formed in the ground using a wall stabilizing liquid, and the excavation groove has a length substantially equivalent to the depth of the excavation groove and is connected to each of both sides thereof. After the bag made of the liquid-impervious sheet with the metal fittings is built in a contracted state, the connecting metal fitting on one edge side of the bag is suspended and supported by the movable cart arranged on the ground portion, and A filling material is injected into the bag body, and the one edge side is moved along the digging groove by swelling of the bag body to form a water blocking wall covered with a liquid-impermeable sheet in the digging groove. A method of constructing a ground stop water wall, comprising: 2. A digging groove is formed in the ground using a wall stabilizing liquid, and the digging groove has a length substantially equivalent to the groove depth, and is connected to each of both side portions thereof. After a bag made of a liquid-impervious sheet with a metal fitting is built in a contracted state, a filler is injected into the inside of the bag, and one side of the bag is expanded along the excavation groove by expanding the bag. To form a water blocking wall covered with a liquid-impermeable sheet in the excavation groove, and at the time of movement of the one side edge, one end is provided at a lower end portion of a connection fitting on one edge side of the bag body. It is fixed, and the other end is provided with a cord-shaped member which extends to the ground by turning the connection fitting portion on the other end edge side, and the movement of the connection fitting on the one edge side is regulated by this cord-shaped member, and the verticality during movement is reduced. The construction of the ground suspension water wall is characterized in that Method. 3. An excavation groove is formed in the ground using a wall stabilizing liquid, and the excavation groove has a length substantially equivalent to the depth of the excavation groove and is connected to each of both sides thereof. After a bag made of a liquid-impervious sheet with a metal fitting is built in a contracted state, a filler is injected into the inside of the bag, and one side of the bag is expanded along the excavation groove by expanding the bag. To form a water-blocking wall covered with a liquid-impermeable sheet in the excavation groove, and at the time of moving the one side edge, a slime suction pipe is connected to a connection fitting on the moving edge side of the bag body. provided, how to build underground cut-off wall, characterized in that the removal of slime deposited excavation bottom with its movement.