JP2879116B2 - Construction method and construction device of water stop wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and an apparatus for constructing a water stop wall constructed in the ground for the purpose of stopping water.

[Problems to be solved by conventional technology and invention]

When constructing an underground structure, it is necessary to stop the water so that groundwater does not enter the enforcement area.

Examples of such a water stopping method include a method using a sheet pile, a method using a simple steel sheet pile, and a method of constructing a continuous underground wall to stop water.

However, the method using sheet pile or simple steel sheet pile cannot stop water at a large depth, and the continuous underground wall can stop water at a large depth. However, since the wall thickness becomes thicker (for example, at least 1000 mm for a depth of 100 m), there is a disadvantage that construction costs are high.

Therefore, the present applicant has provided a method for constructing a water stop wall which can reduce the construction cost as compared with the prior art when stopping water at a large depth (for example, Japanese Patent Application No. 1-231227).

The method is characterized in that the ground is excavated using a wire saw to form an excavation groove, and a water stopping sheet is drawn into the excavation groove and installed.

However, in the related art, if there is gravel or the like on the side wall of the excavation groove, the sheet may be broken when the sheet is pulled in, and in such a case, there is a problem that the water stopping performance is reduced.

The invention according to claim 1 has been made in view of such a problem, and a problem and a problem of the invention are to provide a method of constructing a water blocking wall in which water blocking does not decrease as in the related art. The point is to provide.

On the other hand, various technologies have also been proposed for a water blocking wall construction device.

A cutting machine equipped with a large-diameter diamond tip saw is arranged in and near the first and second guide holes of the guide holes excavated from the ground surface into the ground at appropriate intervals, and a diamond is placed between these two guide holes. After cutting the tip saw and cutting the cutout for the impermeable wall in the ground between the two guide holes while rotating the diamond tip saw in the first guide hole and the second guide hole at a high speed, the two guide holes are installed on the pillars. As well as
A water-impervious sheet sandwiched between these columns is inserted into the water-impervious wall excavation groove, and both guide holes and the water-impervious wall excavation groove are filled with solidified material to construct a water impervious wall construction method. Apparatus used (JP-A-2-171412).

In the vicinity of the first and second guide holes among the guide holes excavated from the ground surface into the ground at appropriate intervals, 2
A cutting device equipped with strip diamond tip saws in parallel is installed, the diamond tip saw is bridged between the two guide holes, and two ground cutting grooves are cut in the ground in parallel with each other. An excavation groove for impermeable walls having an appropriate width was formed by removing the inter-walls, and the struts were erected in both the guide holes, and the impermeable sheet sandwiched between the struts was inserted into the cut grooves for the impermeable walls. Thereafter, an apparatus used in a construction method of a water impervious wall constructed by filling both guide holes and excavation grooves for a water impervious wall with a solidifying material (Japanese Patent Laid-Open No. 2-171415).

A pile body provided with upper and lower pulleys, which are fixedly provided between the top openings of the guide holes excavated in the ground at appropriate intervals, and upper and lower pulleys composed of an outer pulley and an inner pulley, is attached and detached. First and second guide piles movably attached to both sides of the support rod, the first and second guide piles being formed by being connected by a plurality of possible connecting tools, and a movable drive device having a drive pulley; An outer pulley at the upper pulley of the first guide pile, an outer pulley at the upper pulley and an outer pulley at the lower pulley of the second guide pile from the drive pulley,
Construction of a water-blocking wall using an excavator for a cut-out groove for a water-blocking wall composed of an endless diamond tip saw wound in order on a lower pulley in a lower pulley of a first guide pile and an inner pulley in an upper pulley. Method (Japanese Patent Laid-Open No.
No. 23).

A pulley is supported at the lower ends of two guide posts that are suspended by a crane or the like and inserted between adjacent holes, and endless between the pulleys and the guide posts or pulleys arranged at appropriate locations on the ground surface. A narrow groove excavator (JP-A-2-178418), wherein a cutter is mounted endlessly, and the endless cutter is driven by a driving mechanism such as a motor.

The apparatus disclosed in the above-mentioned application specification (Japanese Patent Application No. 1-231227) includes an H steel (guide) 18 which is separately set in two leading holes 2 as shown in FIG. A movable pulley 17 that can be freely raised and lowered separately provided on the 18; a pulley P separately provided on the lower end of the H steel 18; a wire saw 11 that is bridged between the movable pulley 17 and the pulley P; The driving device 14 for running the wire saw 11 is roughly configured. In order to construct a water blocking wall using such a construction device, the driving pulley 17 is moved down by moving the driving means in the X arrow direction.

However, in the above-mentioned conventional techniques, since the water-blocking sheet is drawn into the groove by using a sheet-drawing means separate from the device for cutting the groove, the step of forming the groove, and the water-blocking sheet, There is a problem that the step of pulling in cannot be performed simultaneously. Also,
For those that do not use a moving pulley that moves up and down the guide hole, hard materials such as concrete can be cut because there is little change in the slack of the wire, but in actual ground with uneven hardness, the change in the slack of the wire However, there is a problem that obstacles such as lateral displacement of the wire and detachment of the wire from the pulley are likely to occur, and it is difficult to perform accurate cutting.

Further, in the above-described conventional technology, the tension generated on the wire saw by moving the ground (drive device of the wire saw) due to uneven contact pressure of the ground, frictional force with the guide H steel, and the like. It was difficult to control the lift of the moving pulley with force. For this reason, it is not easy to adjust the height of the moving pulley between one preceding hole (guide hole) and another preceding hole, and it is not possible to raise the wire saw during cutting of the groove to perform inspection or the like. There was a problem.

The invention according to claim 2 has been made in view of such a problem, and the problem and the problem are that the step of forming the groove and the step of drawing in the sheet can be performed simultaneously. , Which can be used even in a soft material such as ground, further facilitates the adjustment of the height of a moving pulley that moves up and down in one preceding hole and another preceding hole, and removes a wire saw during cutting of a groove. An object of the present invention is to provide a water blocking wall construction device that can be pulled up for inspection.

[Means for solving the problem]

The gist of the invention according to claim 1 is a method for constructing a water blocking wall for water blocking to be constructed in the ground, wherein at least two preceding holes are drilled in the ground where the water blocking wall is to be constructed. A step of forming a slot by cutting the ground between two adjacent preceding holes using a wire saw, and a water-blocking material in the two leading holes at both ends of the slot and the slot. And a step of driving the wire saw so that the water blocking material in the slot reaches the entire slot.

The gist of the invention according to claim 2 is that at least the lower end of the water stop wall from the ground is separately built in two preceding holes drilled in portions corresponding to both ends of the water stop wall to be constructed in the ground. Two guides extending to a deeper portion, two moving pulleys for elevating and lowering the respective guides, elevating means for elevating and lowering the movable pulleys, and bridging the respective movable pulleys so as to be able to travel. A wire saw that cuts the ground between each of the preceding holes to form a groove, a driving unit that drives the wire saw, and a water-stop sheet that constitutes a water-stop wall in the groove; The present invention resides in an apparatus for constructing a water-blocking wall comprising a gripping means for pulling the water-blocking sheet into the groove as the moving pulley descends.

[Action]

According to the first aspect of the present invention, since the water-blocking wall is constructed using a water-blocking material instead of the water-blocking sheet, the water-blocking sheet does not break as in the related art.

The gripping means according to the second aspect of the present invention grips the water-stop sheet and draws the water-stop sheet into the groove as the moving pulley descends, so that the ground is cut and the groove is formed while forming the groove. It allows the seat to be pulled in. Also,
The moving pulley that moves up and down in the leading hole and the lifting means that moves the moving pulley up and down further facilitate the adjustment of the height of the moving pulley that moves up and down in one leading hole and the other leading hole, and the wire is cut during the cutting of the groove. It is possible to raise the saw and perform inspections. In addition, the movable pulley prevents the wire saw from swaying and enables vertical cutting.

〔Example〕

Hereinafter, the dimensions, materials, shapes, relative devices, and the like of the components described in the embodiments of the present invention are intended to limit the scope of the present invention only to them unless otherwise specified. It is merely an illustrative example.

First Embodiment First, a configuration of a water blocking wall according to a first embodiment will be described with reference to FIGS. 1 (a) to 3 (b).

The water stop wall 1 is constructed in a thin groove 3 between two preceding holes 2 as shown in FIGS. 1 (a) and 1 (b),
It is a cured body of a self-hardened material (water barrier) 4 extending from the ground surface to a depth slightly above the bottom of the preceding hole 2. The self-hardened material 4
Is obtained by mixing and stirring a bentonite mud (a bentonite stable solution) and a self-hardening liquid containing sodium silicate and cement as main components in the ground G. The thin groove 3 is excavated using the wire saw device 10.

As shown in FIG. 2, the wire saw device 10 includes a main body and a guide device that regulates a moving direction of the main body.

The main body includes a wire saw 11 and a driving device 12 that is in contact with one of the preceding holes 2 and moves the wire saw 11. Depending on the conditions of the ground G, the wire saw 11 can be used for mining rocks, such as diamond wires.
What is suitable for implementing the present invention may be used. What is necessary is just to use the drive machine 12 suitable for implementing this invention.

The guide device has two upper guide pulleys 13 provided above the preceding hole 2 located near the driving device 12,
Two winding electric devices 14 each installed one by one in the vicinity of the two preceding holes 2, and a bottom guide pulley 15 installed one each in the bottom of the two preceding holes 2
And the winding electric device 14 and the bottom guide pulley
Two endless ropes 16 stretched between 15 and
Two pulley boxes 17, 17 'fixed to a part of two endless ropes 16, and two pulley boxes 1
Two guides H to guide 7, 17 'vertically
The steel 18 is provided. The winding electric device 14 and the bottom guide pulley 15 are installed such that their surfaces perpendicular to the axial direction coincide with the surface that the wire saw 11 surrounds. The one pulley box 17 is a hollow box having a substantially rectangular outer contour in a plan view and a rectangular shape in a front view as shown in FIGS. 3 (a) and 3 (b). Inside, there are two support shafts 14b that support the movable pulley 17a in two stages up and down, one for each of the two support shafts 17b, so that the two movable pulleys 17a do not overlap in plan view. Have been placed. In addition, roller 17c
Is provided. The other pulley boxes 17 'have substantially the same configuration except that the position of the moving pulley 17a' is different. The guide H steel 18 is provided with guide grooves 19 of pulley boxes 17, 17 'such that the openings are opposed to each other at the two flanges and extend in the longitudinal direction. Guide groove 19
Is formed by fixing two tongue pieces having a substantially L-shape on a plane perpendicular to the longitudinal direction to the flange at the other end so that one end face of the L-shape faces the two tongue pieces. The endless rope 16 has both ends connected to pulley boxes 17, 17 ', and the pulley boxes 17, 17' together form a ring.

Next, the operation of the wire saw 11 will be described.

In FIG. 2, when the wire saw 11 is rotated, the driving device 12 is moved in the direction indicated by the arrow A, and the winding electric device 14 is driven to rotate the endless rope 16 in the direction indicated by the arrow C. As 17 'descends, the wire saw 11 excavates the ground G to form the thin groove 3.

While moving the driving machine 12 in the direction indicated by the arrow B,
When the endless rope 16 is rotated and rotated in the direction indicated by the arrow D, the pulley box 17 is raised.

 Next, a method for constructing the water stop wall 1 will be described.

First, two preceding holes 2 are constructed at positions corresponding to both ends of the water stop wall 1 to be constructed on the ground G. Preceding hole 2
While pouring in bentonite mud,
Drilling is carried out using a material suitable for carrying out the present invention, a guide H steel 18 is erected in the preceding hole 2, and then a wire saw device 10 is installed.

Next, the ground G is excavated by driving the wire saw device 10 to construct the thin groove 3. Pulley box after excavation
17,17 'is raised. The excavated earth and sand is completely dropped into the preceding hole by the ascending wire saw 11 and discharged.

Next, drain some of the bentonite mud from the bottom,
A self-hardening liquid is injected from above the preceding hole 2.

Next, the driving machine 12 is started again, the wire saw 11 is lowered while rotating, and is raised after reaching the bottom, whereby the bentonite muddy water and the self-hardening liquid are mixed and stirred to obtain the self-hardened material 4.
Over the entire thin groove 3.

 Next, the guide H steel 18 is withdrawn and removed.

When the self-hardened material 4 is cured, the water blocking wall 1 is constructed.

Next, the operation of the water blocking wall 1 configured as described above and the construction method thereof will be described.

 The bentonite mud retains the side walls of the thin groove 3.

 The self-hardened material 4 forms a wall when hardened.

The movable pulleys 17a, 17a 'provided in the pulley boxes 17, 17' are provided with a wire saw 11 traveling between the two pulley boxes 17, 17 ', which is slightly shifted in plan view to twice the wire diameter. It is possible to excavate a groove of thickness.

The wire saw device 10 mixes and stirs the bentonite muddy water and the self-hardening liquid, and spreads the self-hardening material 4 over the entire thin groove 3.

 The wire saw 11 excavates the ground G.

The guide groove 19 regulates the travel of the roller 17c and thus regulates the movement of the pulley boxes 17, 17 '.

Next, the effects of the water blocking wall 1 configured as described above and the method of construction thereof will be described.

Since a situation such as breakage of the sheet does not occur as in the related art, it is possible to prevent a decrease in water stoppage.

Further, a self-hardened material 4 is formed on the entire thin groove 3 by a wire saw 11.
Therefore, a uniform water blocking wall 1 can be constructed.

Moreover, since the conventional wire saw 11 can be used, it can be implemented without developing an excavator for excavating the thin groove 3.

Further, since the bentonite mud is used, springing of groundwater can be prevented even on the ground having an aquifer, and collapse of the side wall of the thin groove 3 can be prevented.

In addition, since the wire saw 11 is lowered by the transmission device 14 instead of the tension of the wire saw 11, it is possible to cut left and right (left and right in FIG. 2) evenly, and it is possible to carry out pulling inspection during cutting. Become.

In this example, a bentonite mud and a self-hardening liquid containing sodium silicate and cement as main components were used as the water-blocking material, but the scope of the present invention is not limited thereto. For example, polyethylene, asphalt, and the like suitable for carrying out the present invention can be used.

In addition, the self-hardening liquid is mixed with the bentonite mud, but all of the liquid can be replaced with the self-hardening liquid. In such a case, the water stoppage can be further improved as compared with the above embodiment.

Further, the guide H steel 18 has been removed from the preceding hole 2, but this is not intended to limit the scope of the present invention thereto, but may be buried.

Further, the shape of the water blocking wall 1 is a shape as shown in FIGS. 1 (a) and 1 (b), but is not intended to limit the scope of the present invention. For example, a shape suitable for carrying out the present invention, such as one provided obliquely to the ground surface as shown in FIG. 4 or a curved shape in a cross-sectional view in the vertical direction as shown in FIG. can do. In particular, in the water stop wall 1 having the shape shown in FIG. 5, the strength against the earth pressure from the direction opposite to the bending direction (leftward in FIG. 5) is improved as compared with the water stop wall 1 according to the first embodiment. Can be.

(Embodiment 2) Embodiment 2 is an embodiment of the present invention.

First, the configuration of the water blocking wall construction device according to the second embodiment will be described with reference to FIG. 6 and FIG.

As shown in FIG. 6, the water blocking wall construction apparatus A includes two H steels (guides) 20 separately built into two preceding holes 2 formed in the ground G, and the respective H steels. Two pulley boxes 21 for raising and lowering 20; lifting means 22 for raising and lowering the pulley boxes 21; pulleys 33 provided at the upper end of each H steel 20; A wire saw 26 that cuts between the holes 2 to form a thin groove 3, an electric motor 32 (drive means) that runs the wire saw 26, and a water stop that forms a water blocking wall in the thin groove 3. Hold the sheet 39 and pull each of the pulley boxes
A gripping means 35 is provided, which can be drawn into the thin groove 3 with the lowering of 21.

Each of the H steels 20 is separately built so that each web faces each other in two preceding holes 2 drilled in portions corresponding to both ends of a water blocking wall to be constructed in the ground G. It extends to a part deeper than the lower end of the water stop wall. The preceding hole 2 is formed using an earth auger or the like suitable for carrying out the present invention.

Each of the pulley boxes 21 is a U-shaped steel box having upper and lower portions opened in a plan view, and has a single pulley (moving pulley) 21a that is pivotally supported therein. Further, as shown in FIG. 7, a hook 21b is provided at a portion corresponding to the inside of the upper limb of the U-shape. The hook 21b
Has an inverted L-shape in side view.

The elevating means 22 is provided with four tractles 23 provided separately for each of the H steels 20, a rope 24 extending over each of the tentles 23 in each of the H steels 20,
And a carriage motor 25 for driving the carriage 24. Each of the takeicles 23 is fixed to an upper surface of a gantry 32 provided at an upper end of each of the H steels 20 and a lower end of each of the H steels 20 so as to be rotatable in a vertical plane. It is. The rope 24 has an endless shape having one end connected to an upper portion of the pulley box 21 and the other end connected to a lower end, and has a length that can be bridged between each of the trolleys 23 and the carriage motor 25. Has become. The carriage motor 25 is an electric motor having one of the two supports 23 provided on each of the pedestals 32 pivotally mounted thereon and fixed on the pedestal 32. In addition,
The carriage motor 25 may be set at another place and the rope 24 may be extended.

Each of the pulleys 33 is located on the left (left side of the sheet of FIG. 6;
The same shall apply. One at the upper end of the H steel 20 on the side), and two at the upper end of the H steel 20 on the right (right side of the paper shown in FIG. 6; the same applies hereinafter). It is a thing. However, the wire saw 26 is provided not vertically above the respective pulleys 21a but shifted above the paper surface shown in FIG. 6 so as not to contact the respective ropes 24.

The wire saw 26 is the same as that according to the first embodiment. However, in the second embodiment, a pulley 33 provided at the upper end of the right H-steel 20 from the electric motor 32 and a pulley 21 in a guide box 21 for raising and lowering the H-steel 20
a, a pulley 21a in a guide box 21 for ascending and descending the H steel 20 on the left side, a pulley 33 provided at the upper end of the H steel 20, and the electric motor 32 are sequentially mounted so as to return to the electric motor 32 again. Further, in the second embodiment, the pulley 33 provided at the upper end of the H steel 20 on the right side is used.
And a wire saw telescopic device between the electric motor 32
27 are provided. The wire saw extension device 27 includes a support frame 28 and a plurality of hanging wheels 30 that are pivotally supported by the support frame 28. The support frame 28 is composed of two supports 29, one support 29 is fixed near the H steel 20 on the right side, and the other support 29 is a carriage 31 on the right side of the one support 29.
It is fixed to the left end of. Then, the wire saw 26 from the pulley 33 provided at the upper end of the H steel 20 on the left
30 is laid in order from bottom to top. By adopting such a structure, the drawback that the horizontal movement distance of the electric motor 32 due to the depth of the excavation of the ground G is increased is eliminated.

The electric motor 32 is fixed to the right end of the carriage 31.

The wire saw 26 has the same configuration as that of the first embodiment.

As shown in FIG. 7, the gripping means 35 includes a clipper 36 for gripping the waterproof sheet 39, a ring 37 inserted through the rope 24, and one end connected to the clipper 36 and the other end connected to the ring.
And a string-shaped body 38 connected to 37. The clipper 36 can grip the water-blocking sheet 39 by tightening a bolt 36a. The circular ring 37 is made of steel whose diameter is much smaller than the size of the pulley box 21. What is suitable for implementing the present invention, such as a wire, may be used for the cord-like body 38.

The water-blocking sheet 39 is slightly longer than the length of the thin groove 3 to be formed, and each edge reaches the inside of the preceding hole 2. Further, in Embodiment 2, as shown in FIG. 7, a span seal water stop plate (trademark) 40 is attached to both sides of the water stop sheet 39. The span seal water stop plate 40
Is a substance obtained by mixing an elastomer with a water-absorbing polymer obtained by introducing a crosslinked structure in a low ratio into a water-soluble polymer such as polyacrylic acid, and swelling by reacting with water in concrete or ground G. It is a swellable material.

Further, in the second embodiment, an earth discharging means 41 is provided. The earth discharging means 41 includes an earth discharging pipe 42 and a pump 43. The discharge pipe 42 has one end connected to the bottom of the preceding hole 2 and the other end connected to the pump 43.
As the pump 43, a pump suitable for carrying out the present invention, such as an air lift or a squeeze type vacuum pump, may be used.

An opening protection frame 44 is inserted into the opening of each preceding hole 2. The opening protection frame 44 is a steel tubular body having an outwardly projecting circumferentially continuous flange at one end, and the wire saw 26 and the water blocking sheet 39 are inserted such that the ends thereof can be inserted therethrough. One slit is formed in the longitudinal direction together with the flange.

Next, the operation of the water blocking wall construction device A configured as described above will be described.

Each H steel 20 guides the pulley box 21 in the vertical direction.

The pulley box 21 guides the wire saw 26 in the up-down direction and prevents the wire saw 26 from running sideways.

The hook 21b hooks the string only when the pulley box 21 is lowered, and prevents the string 38 from being cut by the rotating wire saw 26.

The elevating means 22 elevates the pulley box 21 independently of the traveling of the wire saw 26.

The wire saw extension device 27 adjusts the length of the wire saw 26 by moving the carriage 31 so that another support body 29 approaches or separates from the one support body 29. That is, when the other support 29 moves in the direction of arrow E in FIG. 6, the wire saw 26 extends, and when it moves in the direction of arrow F, the wire saw 26 contracts. As a result, the pulley box 21
The formation of the thin groove 3 becomes possible in combination with the elevation of the groove.

The wire saw 26 is driven in the direction of the arrow W in FIG. 6 by the driving force from the electric motor 32 to cut the ground G to form the thin groove 3.

The gripper 35 is configured such that the clipper 36 grips the lower end of the water-stop sheet 39, and the circular ring 37 is inserted through the rope 24, so that when the pulley box 21 is lowered, the pulley box 21 The circular ring 37 comes into contact with the lower end, descends together with the pulley box 21, and drags the clipper 36 connected by the string-like body 38, and eventually the water-stop sheet 39 gripped by the clipper 36.

The earth discharging means 41 discharges cutting waste and muddy water supplied from the openings of the preceding holes 2 to the ground. The reason why the earth discharging means 41 is provided only in the preceding hole 2 on the left side and not in the preceding hole 2 on the right side is that the wire saw 26 travels in the direction of the arrow W in FIG. Is accumulated in the preceding hole on the left side.

The opening protection frame 44 prevents the opening of each preceding hole 2 from collapsing.

Next, a method of constructing a water blocking wall using the water blocking wall construction apparatus A will be described with reference to FIGS. 8 (a) to 8 (d).

First, the two preceding holes 2 are formed at both ends of the water blocking wall to be constructed in the same manner as in the first embodiment.

Next, the water blocking wall construction device A is installed on the ground G concerned. At this time, the respective pulley boxes 21 are positioned at the upper end of the H steel 20. Further, the water blocking sheet 39,
It is wound in a roll shape and, as shown in FIG. 8 (a), is rotatably mounted immediately above the ground G to be cut by the wire saw 26. Further, the lower end of the water-stop sheet 39 is gripped by the clipper 36 of the gripper 35, and
The string-shaped body 38 is hung on 21b (not shown in FIG. 8 (a)).

Next, as shown in FIG. 8 (b), the wire saw 26 is run, and the carriage motor 25 is operated to cut the ground G between the two leading holes 2 to form the thin grooves 3. The water-stop sheet 39 is drawn into the thin groove 3 while doing so. At this time, by injecting muddy water from the preceding hole 2, cutting is facilitated and seizure of the wire saw 26 is prevented. Further, the discharging means 41 is operated to prevent the muddy water from overflowing from the preceding hole 2 and the thin groove 3 and discharge the cutting waste.

After the cutting of the ground G and the drawing in of the waterproof sheet 39 are completed, a part of the wire saw 26 is cut and pulled up to the ground.

Next, only the two pulley boxes 21 are moved to the upper end of the H steel 20 as shown in FIG. In addition,
Since each edge of the waterproof sheet 39 is not fixed to each pulley box 21, the waterproof sheet 39 can be left in the thin groove 3. Further, since the engaging portion 21b (not shown in FIG. 8 (c)) has an inverted L-shape in a side view, the string-like body 38 does not rise together with the pulley box 21.

Next, as shown in FIG.
And the pulley boxes 21 and the H steels 20 are collected.

 Next, the next span is constructed.

The water blocking wall 1 can be constructed by repeating the above steps. It should be noted that the concrete is poured into the preceding hole 2 after the two water-stop sheets 39 extending from the preceding hole 2 have been drawn.

Next, effects of the water blocking wall construction device A will be described.

Based on the above configuration, the same effects as in the first embodiment can be obtained, and further, the following effects can be obtained.

Since the gripping means 35 configured as described above is used,
The water-stop sheet 39 can be drawn into the thin groove 3 while drilling the thin groove 3.

In addition, since the span seal water stop plate 40 is attached,
The continuity of water stoppage in the preceding hole 2 can be ensured.

Further, since the wire saw extension device 27 is provided, the moving amount of the electric motor 32 can be reduced as compared with the first embodiment.

Also, since the gripping means 35 is separate from the pulley box 21, and since the pulley box 21 does not grip the water-blocking sheet 39, the pulley box 21 and the wire saw 26
Can be pulled up from the thin groove 3 being formed, and only the water-blocking sheet 39 can be left in the thin groove 3.

Further, the lifting / lowering means 22 is connected to the pulley box independently of the electric motor 32 for running the wire saw 26.
Since the 21 is raised and lowered, it is possible to cut left and right evenly, and it is possible to prevent the water-stop sheet 39 from being twisted into the thin groove 3.

The pulley box 21 is connected to the wire saw 26.
, The vertical thin groove 3 can be formed even on the soft ground G.

In the second embodiment, the gripping means 35 has the above configuration, but is not intended to limit the scope of the present invention. For example, in the present invention, a waterproof sheet such as that shown in FIG. What is necessary is just to be able to hold 39 and install it in the groove. The gripping means shown in FIG. 9 includes a clipper 51 for gripping the water-stop sheet 39, a circular ring 52 inserted through the rope 24, a locking portion 53 for locking the circular ring 52, and one end of the clipper. A string-shaped body with the other end connected to the ring 52 at 51
54 and a protective ring interposed in the middle of the string-shaped body 54
It consists of 55.

In the second embodiment, the sheet 39 is pulled in while cutting the ground G. However, this is not intended to limit the scope of the present invention. For example, in the present invention, it is possible to smoothly pull in after excavation. Needless to say, after excavation of the ground G by the wire saw 26, a material suitable for carrying out the present invention, such as drawing in the sheet 39 while running the wire saw 26, can be used. You can also.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

In the first aspect of the present invention, since the water blocking material is used to construct the water blocking wall, there is no possibility that the sheet is broken as in the related art. Therefore, it is possible to prevent the water stoppage of the water stop wall from decreasing. As a result, according to the first aspect of the present invention, it is possible to construct a water blocking wall having better water blocking property than the conventional technology.

According to the second aspect of the present invention, the step of forming the groove and the step of drawing in the water-blocking sheet can be performed simultaneously. As a result, according to the second aspect of the invention, the construction period can be shortened as compared with the related art. Also,
Since the elevating means raises and lowers the moving pulley independently of the driving device of the wire saw, the height of the moving pulley that moves up and down in one preceding hole and the other preceding hole can be easily adjusted, and during cutting of the groove. The wire saw can be pulled up. As a result, accurate excavation can be performed, and inspection and repair of the wire saw can be performed. Further, since the moving pulley prevents the wire saw from swaying, the moving pulley can be used even on a soft object such as a ground.

[Brief description of the drawings]

FIGS. 1 (a) to 3 (b) relate to a first embodiment which is an embodiment of the first aspect of the present invention, and FIG. 1 (a) is a plan view of a water blocking wall, and FIG. (B) is an elevation view of a water stop wall, FIG. 2 is an overall view of a wire saw device, FIG. 3 (a) is a plan view of a pulley box, and FIG. 3 (b) is a side view of a pulley box; FIGS. 4 and 5 are elevation views of a water stop wall according to another embodiment of the present invention, FIGS. 6 to 9 relate to the second embodiment, and FIG. 6 is an overall view of a water stop wall construction device. FIG. 7 is a perspective view of the pulley box, and FIGS. 8 (a) to 8 (d).
FIG. 9 is a process diagram, FIG. 9 is a perspective view showing another embodiment of the holding means, and FIG. 10 is a schematic view of a water blocking wall according to a conventional example. G: ground, A: water blocking wall construction device, 1 ... water blocking wall, 2 ... preceding hole 2, 3, ... thin groove 3, 4 ...
Self-hardened material (water blocking material), 10: Wire saw device, 20: H steel (guide), 21: Pulley box, 21a
…… Pulley (moving pulley), 22 …… Elevating means, 23…
… Ticle, 24… Rope, 25… Carriage motor, 26… Wire saw, 32… Electric motor (drive means), 35… Grip means, 36… Clipper, 37… Round ring,
38 ... string, 39 ... waterproof sheet, 50 ... gripping means,
51: Clipper, 52: Round ring, 53: Locking part, 54: String, 55: Protective ring.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 19/12 E02D 5/20

Claims (2)

(57) [Claims] Claims: 1. A method for constructing a water-stop wall for the purpose of water-stopping to be constructed in the ground, comprising: drilling at least two preceding holes in the ground on which the water-stop wall is to be constructed; A step of forming a slot by cutting the ground between the two preceding holes using a wire saw, and a step of injecting a water-blocking material into the two leading holes at both ends of the slot, and the slot; Driving the wire saw to allow the water blocking material in the slot to reach the entire slot. 2. At least a part deeper than the lower end of the water stop wall from the ground, which is separately built in two preceding holes drilled in parts corresponding to both ends of the water stop wall to be built in the ground. Up to two guides, two moving pulleys for raising and lowering the respective guides, elevating means for raising and lowering the movable pulleys, and each of the preceding holes bridged over the respective movable pulleys so as to be able to travel. A wire saw that cuts the ground to form a groove, a driving unit that runs the wire saw, and grips a water-stop sheet that will form a water-stop wall in the groove, and lowers the moving pulley. Accordingly, a water blocking wall construction device comprising: a gripping means for drawing the water blocking sheet into the groove.