JPH04174131A - Method and device for executing cut-off wall - Google Patents

Abstract

PURPOSE:To improve cut-off property by boring at least two preceding pits, excavating a ground between the pits by a wire saw, and forming a thin-ditch while filling the inside of the ditch with a self-hardening water-barrier material or stretching a cut-off sheet. CONSTITUTION:At least two preceding pits 2 are bored to a ground G, and a ditch 3 in a narrow width is excavated between the pits by wire saws 11. The ditch 3 is filled with a liquefied self-hardening water-barrier material, thus forming a cut-off wall. A cut-off sheet is stretched in the ditch 3 as required. Accordingly, the cut-off wall having excellent cut-off property can be acquired.

Description

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

[Prior Art and Problems to be Solved by the Invention] When constructing an underground structure, it is necessary to shut off water to prevent underground water from entering the construction area.

Such water stoppage methods include methods using sheet piles,
Methods such as using simple steel sheet piles and constructing continuous underground walls to stop water are being implemented.

However, methods using sheet piles or simple steel sheet piles cannot stop water at great depths, and
Continuous underground walls can stop water even at great depths, but they have the disadvantage of being thicker due to the use of excavation equipment (for example, a wall with a depth of 100 m requires a high construction cost of at least 100,100 O). Ta.

Therefore, the present applicant has provided a method for constructing a water-stopping wall that can reduce construction costs compared to conventional techniques when water is stopped at great depths (for example, Japanese Patent Application No. 1-231227).

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

However, in the prior art, if there are gravel or the like on the side walls of the excavation groove, the sheet may be torn when it is pulled in, and in such a case, there are problems such as a decrease in water-stopping performance.

The invention as claimed in claim 1 has been made in view of the above problem, and the problem is that the construction method of the water-stopping wall does not deteriorate in water-stopping performance unlike the prior art. It is in the point of providing.

On the other hand, various techniques have been proposed for construction equipment for water-stop walls.

■A cutting machine equipped with a large-diameter diamond-tipped saw is placed in and near the first and second guide holes, which are drilled from the ground surface to the ground at appropriate intervals, and between these two guide holes. After cutting an excavation groove for an impermeable wall in the ground between both guide holes by spanning the Tire mondo chip saw and rotating the Tire mondo chip saw at high speed in the first guide hole and the second guide hole, At the same time as the pillars are erected, the water-shielding sheet sandwiched between these pillars is inserted into the water-shielding wall excavation groove, and both guide holes and the water-shielding wall excavation groove are filled with solidifying material. Device used in water wall construction method (Japanese Unexamined Patent Publication No. 171412/1999).

■In the vicinity of the first and second guide holes of the guide holes excavated from the ground surface to the ground at appropriate intervals, two
A cutting device equipped with diamond-tipped saws arranged in parallel is installed, and the diamond-tipped saw is spanned between the two guide holes to cut two cutting grooves in parallel in the ground, and between these cutting grooves. By removing the partition wall, an excavated groove for the impermeable wall of an appropriate width is formed, and pillars are erected in both guide holes, and the impermeable sheet sandwiched between the pillars is inserted into the cut groove for the impermeable wall. After that, both the guide holes and the excavated groove for the impermeable wall are filled with solidifying material to construct the impermeable wall.

■The pile body is equipped with a support rod fixedly installed between the top openings of guide holes excavated in the ground at appropriate intervals, and upper and lower pulleys consisting of an outer pulley and an inner pulley at the upper and lower parts. a movable drive device including first and second guide stakes which are formed by connecting a plurality of guide stakes with detachable connectors and are movably attached to both sides of the support rod; and a drive boot. , an outer pulley in the upper pulley of the first guide pile from the drive boot, an outer pulley in the two-part pulley and an outer pulley in the lower pulley of the second guide shaft, a lower pulley in the lower pulley of the first guide pile and an outer pulley in the upper pulley. Used in a method of constructing a water cutoff wall using a cutting machine for cutting grooves for water cutoff walls, which is composed of an endless diamond-tipped saw wound around an inner pulley (Japanese Unexamined Patent Publication No. 2-1)
No. 71423).

■A pulley is pivotally supported at the lower end of two guide columns that are suspended by a crane or the like and inserted between adjacent holes, and from between these pulleys to between guide columns or pulleys placed at appropriate locations on the ground surface. A narrow trench excavating device (Japanese Patent Application Laid-Open No. 178418/1999) characterized in that an endless cutter is mounted in an endless manner, and the endless cutter is driven circularly by a drive mechanism such as a motor.

■ The device disclosed in the application specification (Japanese Patent Application No. 1231227) has two leading holes 2 as shown in FIG.
H2N (guide) 18 which is installed separately in the H2N (guide) 18, movable pulley 17 which can be raised and lowered separately provided on the H steel 18, pulley P provided separately on the lower end of the H steel 18, and the movable boo 1. ) -17 and the pulley P, and a drive device 14 for driving the wire saw 11. To construct a water stop wall using such a construction device, the movable pulley 17 is lowered by moving the drive means in the direction of the X arrow.

However, in the conventional techniques (■ to ■) above,
Since the water-stopping sheet is pulled into the groove using a sheet pulling means that is separate from the device that cuts the groove, the process of forming the groove and the process of drawing the water-stopping sheet cannot be performed at the same time. There was a problem. In addition, for those that do not use a moving pulley that moves up and down inside the guide hole, it is possible to cut hard materials such as concrete because there is little change in the slack of the wire, but in actual ground where the hardness varies, the wire There was a problem in that the change in slack was large and problems such as the wire wobbling sideways or the wire coming off the pulley were likely to occur, making it difficult to cut accurately.

In addition, in the conventional technology (■) above, contact pressure of the ground,
Due to factors such as uneven frictional force with the guide H steel, it has been difficult to control the elevation of the moving pulley using the tensile force generated on the wire saw by moving the ground (the drive device of the wire saw). Therefore, there are problems in that it is not easy to adjust the height of the moving pulley between the - leading hole (guide hole) and other leading holes, and it is not possible to pull up the wire saw in the middle of cutting a groove to perform inspections, etc. There was a problem.

The invention as claimed in claim 2 has been made in view of the above problem, and the problem is that the step of forming the groove and the step of drawing the sheet can be performed at the same time. It can also be used in soft materials such as earth, and in addition, in - leading holes and other leading holes? ? To provide a water-stop wall construction device that facilitates adjustment of the height of a movable pulley that is lowered, and also allows a wire saw to be pulled up and inspected during cutting of a groove.

[Means to solve the problem]

The gist of the invention as claimed in claim 1 is a method for constructing a water-stopping wall constructed in the ground for the purpose of water-stopping, the method comprising drilling at least two preliminary holes in the ground where the water-stopping wall is to be constructed. process and
A step of cutting the ground between the two adjacent preceding holes using a wire saw to form a groove, and injecting a water-blocking material into both the preceding holes existing at both ends of the groove and the groove. and a step of driving the wire saw to spread the water-blocking material in the groove to the entire groove.

The gist of the invention as claimed in claim 2 is that the water cutoff wall is constructed from at least the lower end of the water cutoff wall from the ground, the water cutoff wall being built in the ground separately in two preceding holes drilled in portions corresponding to both ends of the water cutoff wall to be constructed in the ground. two guides that reach a deeper part, two movable pulleys that raise and lower each of the guides, a lifting means for raising and lowering the movable pulleys, and a movable bridge that spans each of the movable pulleys. A wire saw that cuts the ground between each of the preceding holes to form a groove, a driving means for driving the wire saw, and a water-stopping sheet that will constitute a water-stopping wall in the groove, and the The present invention relates to a water-stop wall construction device comprising a gripping means for pulling the water-stop sheet into the groove as the movable pulley descends.

[Effect]

In the invention as claimed in claim 1, since the water-stopping wall is constructed using a water-stopping material instead of a water-stopping sheet, there is no possibility of the water-stopping sheet being torn as in the prior art.

The gripping means according to the invention described in claim 2 grips the water-stopping sheet and draws the water-stopping sheet into the groove as the movable pulley descends. Allows the sheet to be pulled in. Furthermore, the movable pulley that ascends and descends within the preceding hole and the elevating means that ascends and descends the movable boo 9- further facilitates the adjustment of the height of the movable pulley that ascends and descends between the preceding hole of - and other preceding holes, and It is possible to pull up the wire saw during cutting to perform inspections, etc. Additionally, the movable pulley prevents the wire saw from wobbling horizontally and enables vertical cutting.

〔Example〕

Hereinafter, the dimensions, materials, shapes, relative devices, etc. of the component parts described in the embodiments of the present invention are not intended to limit the scope of the present invention to only those described unless specifically stated. It's not a real thing, it's just an illustrative example.

(Example 1) First, the structure of the water stop wall according to Example 1 will be explained using 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 FIG. 1(a) and FIG. This is a hardened body of self-hardened material (water-shielding material) 4 that reaches the depth of the upper part. The self-hardened material 4 is
Bentonite mud (bentonite stable solution) and self-hardening liquid mainly composed of silicic acid sorter and cement are added to the ground G.
The hardened product is obtained by mixing and stirring inside the container.

The thin groove 3 was excavated using a wire saw device 10.

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

The main body is in contact with the wire saw 11 in the vicinity of one preceding hole 2, and has a drive machine 1 for driving the wire saw 11.
2. Depending on the conditions of the ground G, the wire saw 11 may be made of a material suitable for carrying out the present invention, such as a diamond wire used for rock mining. The drive unit 12 may be any suitable one for carrying out the present invention.

The guide device includes two upper guide pulleys 13 provided above the leading hole 2 located near the drive machine 12, and two upper guide pulleys 13 each installed near the two leading holes 2. A winding electric device 14, a bottom kite pulley 15 installed one each at the bottom of the two preceding holes 2, and a two-wheel kite pulley 15 suspended between the winding electric device 14 and the bottom guide pulley 15. two endless ropes 16, two pulley boxes 17.17' fixed to parts of the two endless ropes 16, and two guides Hjl1418 that guide the two pulley boxes 17.17' in the vertical direction, respectively. It is equipped with the following. Winding electric device 14 and bottom guide pulley 1
5 is installed so that the surface perpendicular to the axial direction thereof coincides with the surface surrounded by the wire saw 11. As shown in FIGS. 3(a) and 3(b), the pulley box 17 is a hollow box whose outer outline is approximately rectangular in plan view and also rectangular in front view.

Inside, there are two support shafts 14b that pivotally support the movable boot') 17a in two stages, upper and lower, and each of the two support shafts 17b has two movable pulleys 1 in plan view.
7a are arranged so that they do not overlap. Further, a roller 17c is provided on the outer edge surface. Note that the other pulley boxes 17' have almost the same configuration except that the position of the movable pulley 17a' is different. Guide Hw4
1B has a pulley box 17.17' with openings facing each other and extending longitudinally in the two flanges.
A guide groove 19 is provided. The guide groove 19 is formed by fixing two tongue pieces having an abbreviated letter shape in a plane perpendicular to the longitudinal direction thereof, with the other end fixed to a flange so that one end surface of the L letter faces each other. The endless rope 16 has both ends tied to a pulley box 17, 17', and the pulley boxes 17, 17' together form a ring shape.

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

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

When the drive machine 12 is moved in the direction indicated by arrow B, the tomo
When the endless rope 16 is rotated in the direction indicated by the arrow, the pulley box 17 rises one step.

Next, a method of constructing the water cutoff wall 1 will be explained.

First, two preliminary holes 2 are constructed in the ground G at positions corresponding to both ends of the water stop wall 1 to be constructed. The preliminary hole 2 is excavated using an earth auger or the like suitable for carrying out the present invention while injecting bentonite slurry, and the guide 1] steel 18 is built into the preliminary hole 2, and then the wire saw device 10 is drilled. Set up.

Next, the wire saw device 10 is driven to excavate the ground G to construct the thin groove 3. After the excavation is completed, pulley box 17.17' is raised.

Incidentally, the excavated soil completely falls into the preceding hole and is discharged by the rising wire saw 11.

Next, a portion of the bentonite mud is drained from the bottom, and a self-hardening liquid is injected from the top of the preceding hole 2.

Next, the drive machine 12 is started again, the wire saw 11 is rotated and lowered, and after reaching the bottom, it is raised to mix and stir the hentonite mud and the self-hardening liquid, and the self-hardening material 4 is cut into the thin groove 3. Make sure that it spreads throughout the entire area.

Next, the guide H steel 18 is pulled up and removed.

By curing the self-hardened material 4, the water stop wall l will be constructed.

Next, the function of the water stop wall 1 constructed as above and the construction method thereof will be explained.

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

When the self-hardened material 4 is hardened, it forms a wall.

The movable pulleys 17a, 17a' installed in the pulley box 17.17' can be moved up to twice the diameter of the wire by gradually shifting the wire saw 11 running between the two pulley boxes 17.17' in plan view. It is possible to excavate trenches with a thickness of .

The wire saw device 10 mixes and stirs the bentonite mud 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 restricts the travel of the roller 17c, and in turn restricts the movement of the pulley box 17, 17'.

Next, the effects of the water stop wall 1 configured as described above and its construction method will be explained.

Since the sheet does not tear as in the prior art, it is possible to prevent the water-stopping property from deteriorating.

Furthermore, the self-hardened material 4 is inserted into the entire thin groove 3 using the wire saw 11.
, it is possible to construct a uniform water-stop wall.

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

Further, since bentonite mud is used, it is possible to prevent groundwater from springing up even in the ground having an aquifer, and to prevent the side walls of the thin groove 3 from collapsing.

In addition, since the wire saw 11 is lowered by the transmission device 14, it is possible to cut evenly on the left and right sides (left and right in FIG. 2) without the tension of the wire saw 11.
In addition, it becomes possible to pull up and inspect during cutting.

In this example, hentonite mud and a self-hardening liquid mainly composed of sodium silicate and cement were used as the water-blocking material, but this is not intended to limit the scope of the present invention, and other materials may be used in the present invention. For example, polyethylene,
Any material suitable for carrying out the present invention, such as asphalt, can be used.

Moreover, although the self-hardening liquid was mixed with the bentonite mud, it is also possible to replace the entire mixture with the self-hardening liquid. In such a case, the water-stopping property can be further improved compared to the above embodiment.

Moreover, although the guide H steel 18 was removed from the preceding hole 2, the scope of the present invention is not limited thereto, and the guide H steel 18 may be completely buried.

Also, the shape of the water stop wall 1 is shown in Figure 1 (A) and Figure 1 (B).
Although the shape shown in 1 is not intended to limit the scope of the present invention, the present invention does not intend to limit the scope of the present invention.
The shape may be suitable for carrying out the present invention, such as a shape that is diagonal to the ground surface as shown in FIG. 4, or a shape that is curved when viewed in vertical cross section as shown in FIG. I can do it. In particular, in the case of the water stop wall 1 having the shape shown in Fig. 5, the direction opposite to the curving direction (to the left in Fig. 5)
It is possible to improve the strength of the water stop wall 1 in comparison with the water stop wall 1 according to the first embodiment.

(Example 2) Example 2 is an example of the invention set forth in claim 2.

First, the configuration of the water cutoff wall construction apparatus according to the second embodiment will be explained using FIGS. 6 and 7.

The water cutoff wall construction device A, as shown in FIG.
Two 8W4 (guides) 20 each built into the two advance holes 2 formed inside, and each 1-1 $ 20
two pulley hooks 21 for raising and lowering the pulley box 21, a lifting means 22 for raising and lowering the pulley box 21, a pulley 33 provided at the upper end of each I'' steel 20, and each preceding pulley 33 spanned over the pulley 33. A wire saw 26 that cuts between the holes 2 to form the thin groove 3, an electric motor 32 (driving means) that drives the wire saw 26, and the thin groove 3.
A water-stopping sheet 3 that forms a water-stopping wall inside
9, and a gripping means 35 that can be pulled into the thin groove 3 as each pulley box 21 is lowered.

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

Each of the pulley boxes 21 is a U-shaped steel box in plan view with an open top and a bottom, and has one pulley (moving pulley) 21a that is pivotally supported inside. Further, as shown in FIG. 7, a hook portion 21b is provided at a portion corresponding to the inside of the upper limb of the U-shape. The hooking portion 21b has an inverted shape when viewed from the side.

The elevating means 22 includes four teacles 23 separately provided in each of the H@20, a lobe 24 spanning each teakle 23 on each of the I4 steels 20, and a carriage for running the lobe 24. motor 2
5. Two of the teakles 23 are rotatably fixed in a vertical plane to the upper surface of a pedestal 32 provided on the second part of each H steel 20 and to the lower end of each HM 20. It is something. The lobe 24 has one end connected to the second part of the pulley box 21,
It has an endless shape with the other end tied to the lower end, and has a length that can be bridged between each teakle 23 and the carry/fuji motor 25.

The carriage motor 25 is connected to the negative cheek 2 of the two cheeks 23 provided on each of the mounts 32.
3 is pivoted and fixed on the pedestal 32. Note that the carriage motor 25 may be set elsewhere and the lobe 24 may be extended.

Each of the pulleys 33 is located on the left side (the left side of the page showing FIG. 6).

The same shall apply hereinafter. ) side, one on the upper end of H steel 20, right side (
Right side of the page showing Figure 6. The same shall apply hereinafter. ) are provided at the upper end of the H steel 20 so as to be rotatable in the vertical plane. However, in order to prevent the wire saw 26 from coming into contact with each of the lobes 24, each of the pulleys 21a
It is provided not directly above, but shifted to the upper side of the plane of the paper showing FIG.

The wire saw 26 is similar to that according to the first embodiment. However, in the second embodiment, the electric motor 32 is connected to the pulley 3 provided at the upper end of the H steel 20 on the right side.
3. A pulley 21a in the guide box 21 that raises and lowers this H steel 20, a pulley 21a in the guide box 21 that raises and lowers the left I4 steel 20, a pulley 33 provided at the upper end of this H@20, and the electric motor 32 again. They will be mounted one after another so that they return to the original location. Furthermore, in Example 2, the right H
A pulley 33 provided at the upper end of the steel 20 and the electric motor 3
A wire saw expansion/contraction device 27 is provided between the two. The wire saw expansion/contraction device 27 includes a support frame 28 and a plurality of hook wheels 30 pivotally supported by the support frame 28. The support frame 28 consists of two supports 29, the - support 29 is fixed near the -I] steel 20 on the right side, and the other support 29 is fixed to the carriage 31 on the right side of the - support 29. It is fixed at the left end. And H steel 2 on the left
Wire saw 2 from pulley 33 provided at one end of 0
Each of the above-mentioned hooks 6 is successively installed on the wheel 30 from the bottom to the top. By adopting such a structure, the drawback that the horizontal movement distance of the electric motor 32 becomes long due to the depth of excavation of the ground G is eliminated.

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

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

As shown in FIG. 7, the gripping means 35 includes a clipper 36 that grips the water-stopping sheet 39, a round ring 37 inserted through the lobe 24, and one end of which is connected to the clipper 36 and the other end of which is connected to the round ring 37. It consists of a string-like body 38 connected to. The clipper 36 can grip the water-stopping sheet 39 by tightening the port 36a.

The round ring 37 is made of steel and has a diameter much smaller than the dimensions of the pulley box 21. The string-like body 38 may be made of a material suitable for carrying out the present invention, such as a wire.

The water-stopping sheet 39 is slightly longer than the length of the thin groove 3 to be formed, and extends from each edge to the inside of the preceding hole 2. Furthermore, in the second embodiment, as shown in FIG.
Trademark) 40 is installed. The Spanseal water stop plate 40 is a material made by mixing an elastomer with a water-absorbing polymer obtained by introducing a low proportion of cross-linked structure into a water-soluble polymer such as polyacrylic acid, and is a material that contains water in concrete or ground G. It is a water-swellable material that swells when it reacts with water.

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

Furthermore, an opening protection frame 44 is inserted into the opening of each of the preceding holes 2. The opening protection frame 44 is a steel cylindrical body that has a circumferentially continuous flange that protrudes outward at one end, and is configured so that the ends of the wire saw 26 and the water-stopping sheet 39 can be inserted therethrough. Along with the flange in the longitudinal direction −
It forms a slit.

Next, the operation of the water-stop wall construction apparatus A configured as described above will be explained.

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

The pulley box 21 guides the wire saw 26 in the vertical direction and prevents the wire saw 26 from wobbling laterally.

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

The lifting means 22 lifts and lowers the pulley box 21 regardless of the running of the wire saw 26.

The wire saw expansion/contraction device 27 adjusts the length of the wire saw 26 by moving the cart 31 so that the other support 29 approaches or moves away from the negative support 29. That is, when the other support body 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 extends.
degenerates. As a result, in combination with the lifting and lowering of the pulley box 21 by the lifting means 22, the thin groove 3 can be formed.

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

In the gripping means 35, the clipper 36 grips the lower end of the water-stopping sheet 39, and the round ring 37 passes through the lobe 24, so that when the pulley box 21 is lowered, the pulley box 2I The round ring 37 comes into contact with the lower end, descends together with the pulley box 2I, and drags the clipper 36 connected by the string-like body 38 and, by extension, the water-stopping sheet 39 held by the clipper 36.

The earth discharge means 41 discharges cutting shear and muddy water replenished from the openings of the respective preceding holes 2 to the ground. The reason why the υF soil means 41 is provided only in the left-hand leading hole 2 and not in the right-hand leading hole 2 is because the wire saw 26 travels in the direction of the arrow W in FIG. This is because it accumulates in the leading hole 2 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 cutoff wall using the water cutoff wall construction apparatus A will be described with reference to FIGS. 8(a) to 8(d).

First, both leading holes 2 are formed at both ends of the water stop wall to be constructed by the same method as in Example 1.

Next, the water stop wall construction device 8 is installed on the ground G. At that time, each pulley box 21 is
Position it at the top of the . In addition, the water-stopping sheet 39
is wound into a roll and rotatably placed directly above the ground G to be cut by the wire saw 26, as shown in FIG. 8(A). Further, the lower end portion of the water-stopping sheet 39 is gripped by the clipper 36 of the gripping means 35, and the string-like body 38 is hooked to the hook portion 21b (the path 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 a thin groove 3. While doing so, the water-stopping sheet 39 is drawn into the thin groove 3. In addition, at this time, by pouring muddy water from the preceding hole 2, cutting is facilitated, and the wire saw 2
6. Prevents burn-in, etc. Further, the earth removal means 41 is operated to prevent muddy water from overflowing from the preceding hole 2 and the thin groove 3 and to remove cutting shears.

After cutting the ground G and pulling in the water-stopping sheet 39, a part of the wire saw 26 is cut and pulled up to the ground.

Next, as shown in FIG. 8(C), only the two pulley boxes 21 are moved to the upper end of the H@20. In addition, since each edge of the water-stopping sheet 39 is not fixed to each of the pulley boxes 21, the water-stopping sheet 39 can remain in the thin groove 3. Also,
The hooking portion 21b (the path shown in FIG. 8(c)) is
Since it has an inverted shape in side view, the string-like body 38 does not rise together with the pulley box 21.

Next, as shown in FIG. 8(d), both ropes 24
and both pulley boxes 2].

Each of the H ropes 20 is collected.

Next, construct the adjacent span.

The water stop wall 1 can be constructed by repeating the above steps. Incidentally, concrete may be poured into the preceding hole 2 after the two water-stopping sheets 39 extending from the preceding hole 2 are drawn in.

Next, the effects on the water cutoff wall construction apparatus will be explained.

Based on the above configuration, the same effects as in Example 1 can be obtained, and the following effects can also be obtained.

Since the gripping means 35 configured as described above is used,
The water-stopping 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 installed,
Continuity of water stoppage within the preceding hole 2 can be ensured.

Furthermore, since the wire saw expansion/contraction device 27 is provided, the amount of movement of the electric motor 32 can be reduced compared to the first embodiment.

Further, the gripping means 35 is separate from the pulley box 21, and the pulley pock 7,
-21 does not grip the water-stopping sheet 39,
In the middle of cutting the ground G, the pulley box 21 and wire saw 26 can be pulled up from the thin groove 3 that is being formed, and only the water-stopping sheet 39 can remain in the thin groove 3. .

In addition, since the elevating means 22 raises and lowers the pulley box 21 independently of the electric motor 32 that drives the wire saw 26, it is possible to cut the pulley box 21 evenly on the left and right sides. It can prevent twisting, etc.

Further, the pulley box 21 is connected to the wire saw 2.
Since the horizontal movement of the groove 6 is prevented, a vertical thin groove 3 can be formed even on soft ground G.

In the second embodiment, the gripping means 35 has the above-mentioned structure, but the scope of the present invention is not limited thereto. 39 and can be installed in the groove. The gripping means shown in FIG. 9 includes a clipper 51 that grips the water-stopping sheet 39, a round ring 52 inserted through the lobe 24, a locking part 53 that locks the round ring 52, and one end of which is connected to the clipper 51. 51 and the other end is connected to the round ring 52.
It consists of a string-like body 54 connected to the string-like body 54, and a protective ring 55 interposed in the middle of the string-like body 54.

In addition, in the second embodiment, the sheet 39 was pulled in while cutting the ground G. However, the scope of the present invention is not limited to this, and the present invention does not mean that the sheet 39 can be pulled in smoothly after excavation. Of course, after excavating the ground G with the wire saw 26, the wire saw 26
Any method suitable for carrying out the present invention can be used, such as pulling in the seat 39 while running the vehicle. I'll come this year.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces effects as described below.

In the invention described in claim I, since the water-stopping wall is constructed using a water-blocking material, there is no possibility of the sheet being torn as in the prior art. Therefore, it is possible to prevent the water-stopping property of the water-stopping wall from decreasing. As a result, claim 1
According to the described invention, it is possible to construct a water-stopping wall that has better water-stopping properties than conventional techniques.

Furthermore, in the invention as set forth in claim 2, the step of forming the grooves and the step of drawing in the water-blocking sheet can be performed simultaneously. As a result, according to the invention recited in claim 2, the construction period can be shortened compared to the prior art. Furthermore, since the elevating means raises and lowers the movable pulley independently of the drive device of the wire saw, it is possible to easily adjust the height of the movable pulley that is raised and lowered between the - leading hole and the other leading holes.
Moreover, the wire saw can be pulled up in the middle of cutting the groove. As a result, accurate excavation can be performed, and the wire saw can be inspected, repaired, etc. Furthermore, since the moving pulley prevents the wire saw from wobbling sideways, it can be used even on soft objects such as earth.

[Brief explanation of drawings]

1(a) to 3(b) relate to Example 1, which is an embodiment of the invention as claimed in claim 1, and FIG. 1(a) is a plan view of the water stop wall, and FIG. B) is an elevational view of the water stop wall, FIG. 2 is an overall view of the wire saw device, FIG. 3(A) is a plan view of the pulley box, and FIG. 3(B) is a side view of the pulley box. Figures 4 and 5 are elevational views of water-stop walls according to other embodiments of the present invention, Figures 6 to 9 relate to Example 2, and Figure 6 is an overall view of water-stop wall construction equipment. , FIG. 7 is a perspective view of the pulley box, FIGS. 8(a) to 8(d) are process diagrams, FIG. 9 is a perspective view showing another embodiment of the gripping means,
FIG. 10 is a schematic diagram of a water-stop wall according to a conventional example. G...Ground, A...Water stop wall construction equipment, l
...Water stop wall, 2...Previous hole 2.3...
... Thin groove 3.4 ... Self-hardening material (waterstop material), 1
0...Wire saw device, 20...J (I (guide), 21...
Pulley box, 21a'... Pulley (moving pulley), 22... Lifting means, 23...
...Cheekle, 24...Rope, 25...
... Carriage motor, 26 ... Wire saw, 32 ... Electric motor (drive means), 35
...Gripping means, 36... Clipper, 3
7...Round ring, 3B...String-like body, 39...
... Waterproof sheet, 50 ... Gripping means, 5
1... Clipper, 52... Round ring, 53
...Locking part, 54... String-like body, 55.
...protective ring.

Claims (2)

[Claims] (1) A construction method for a water stop wall built in the ground for the purpose of water stop, which includes the step of drilling at least two preliminary holes in the ground where the water stop wall is to be constructed, and the process of drilling two adjacent holes. a step of cutting the ground between the preceding holes using a wire saw to form a groove; a step of injecting a water-blocking material into both the preceding holes existing at both ends of the groove and the groove; A method for constructing a water-stop wall, comprising the step of driving a wire saw to spread the water-blocking material in the groove to the entire groove. (2) Built separately into two preliminary holes drilled in the parts corresponding to both ends of the water stop wall to be constructed in the ground, extending from the ground to at least a part deeper than the lower end of the water cut wall. Two guides, two movable pulleys for raising and lowering each of the guides, a lifting means for raising and lowering the movable pulleys, and a space between each of the preceding holes that is movably spanned over each of the movable pulleys. A wire saw that cuts the ground to form a groove, a drive means that drives the wire saw, and a water-stopping sheet that forms a water-stopping wall in the groove, and as the movable pulley descends, the A water-stop wall construction device comprising a gripping means for pulling the water-stop sheet into a groove.