JP3846887B2 - Construction method and equipment for underground continuous wall - Google Patents

Description

  The present invention relates to an underground continuous wall construction method and construction equipment constructed in civil engineering construction.

  To improve the workability of the underground continuous wall, a chain type cutter, in which an endless chain equipped with a drilling blade is stretched between a drive wheel and a guide wheel provided on the cutter post, is attached to the guide. While the chain cutter is inserted into the ground, it is horizontally moved by the guide while rotating the cutter to excavate the continuous wall into the ground, and the solidified material is injected into the excavated continuous groove. There is a known construction method (for example, Patent Document 1) for creating a continuous wall in the ground.

  Further, prior to the injection of the solidified material, there is a case where a prior excavation in which a stable liquid is injected while excavating the ground with an excavation device such as the chain cutter, is used for the preceding excavation. A rotary excavator such as an auger is used.

  In the construction method described above, while excavating with a cutter, the excavated sediment is mixed with the stabilized liquid injected into the excavated hole and preceded excavation is performed. In order to construct a continuous wall by mixing, in principle, muddy water is generated for the injected stabilizing liquid and solidified material. For this reason, conventionally, a mud pit is provided at the site, solidified by performing sun drying or cement solidification, and then carried out, or after reaching a predetermined strength, reused at the site.

However, when installing mud storage pits, the construction progress may be hindered due to site restrictions that can be secured at the site. The muddy water generated at the site had to be treated as industrial waste.
JP-A-7-180154

  Therefore, the present invention eliminates waste by reusing the muddy water generated when building the underground continuous wall, improves workability, and reduces the environmental load. It aims at providing a construction method and a construction apparatus.

The invention of claim 1, together with the drilling location to build underground wall by excavating equipment, after Tsu line prior excavation by injecting stabilizing solution, chain-type drilling locations were the preceding excavation by the solidification step in a state in which built up the cutter to rotate the cutter, the diaphragm wall formed by injecting a solidifying material into excavated sand while moving the cutter, to recover the mud generated in the preceding drilling, and this recovered the sediment fraction was separated from the mud, a the separated construction methods of sediment content and sediment content of the separated you reuse the separated liquid earth during continuous wall, with the prior drilling, water to the recovered mud To adjust the water content ratio, and the muddy water whose water content ratio has been adjusted is sieved into the earth and sand and the separated liquid in a vibrating sieve, and the separated liquid is reused as the stabilizing liquid. Muddy water generated when the solidified material is injected The water content is adjusted by adding water to the recovered muddy water, and the muddy water whose water content ratio has been adjusted is sieved with a vibrating sieve into a separated liquid from which the earth and sand have been separated. The construction method is reused for the solidified material .

Moreover, invention of Claim 2 is the construction method which reuses the said earth and sand part sifted out from the muddy water which adjusted the said water content ratio in the said solidification stage .

The invention of claim 3 is used in the construction method according to claim 1 or 2 underground continuous wall according, with drilling position for constructing the underground walls, perform the preceding excavation by injecting the stabilizing solution It said drilling device, in the solidifying step, the preceding excavation in a state of built up drilling locations were, to rotate the cutter, forming a diaphragm wall by injecting the solidifying material while moving the cutter It said chain type cutter to a construction apparatus and a said vibrating sieve to separate the sediment fraction from muds adjusting the water content ratio generated in the solidification stage and the preceding excavation.

Moreover, invention of Claim 4 is a construction apparatus provided with the spin-drying | dehydration means which spin-dry | dehydrates the sediment remaining in the separated liquid which isolate | separated the sediment with the said vibration sieve.

  According to the configuration of claim 1, in order to collect the muddy water generated by the preceding excavation and separate it into the separated liquid and the earth and sand, it is possible to effectively use the muddy water that conventionally required disposal or treatment, for example, Since the separation liquid contains the components of the stable liquid and fine particles such as silt and clay that are generated on site, it can be reused in the separation liquid, and the amount of added components can be reduced. The earth and sand can be reused for civil engineering materials.

  Moreover, according to the structure of Claim 2, the muddy water containing the solidification material is collect | recovered, it can isolate | separate into a separated liquid and earth and sand, and earth and sand or separated water can be reused.

  According to the structure of claim 3, by constructing the underground wall using this apparatus, the muddy water generated when the previous excavation or the solidification material is injected is recovered, and conventionally muddy water that has been required to be discarded or treated. Can be used effectively.

  Moreover, according to the structure of Claim 4, the earth and sand content is isolate | separated by a sieve, Furthermore, earth and sand content can be isolate | separated by a dehydration means, and it can reuse for civil engineering materials, without providing a dedicated separation facility etc. .

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each example, by adopting a new construction method and construction equipment different from the conventional one, an underground continuous wall construction method and construction equipment with an unprecedented function can be obtained. Describe each.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an embodiment of the present invention. As shown in the figure, 11 is the ground, 12 is a self-propelled vehicle of the excavator 10, 13 is a crawler, 14 is a swivel, 15 is a driver's cab, and 16 is a hydraulic unit provided at the rear. In the present embodiment, the upper horizontal member 17, the lower horizontal member 18, and the four vertical members 19 are framed to form a frame 20, and the frame 20 is fixed vertically on one side of the vehicle 12. . That is, 21 is two brackets projecting on the outer surface of one of the crawlers 13. The lower horizontal member 18 of the frame 20 is fixed to the bracket 21 and the bracket is projected on the rear surface of the upper horizontal member 17 of the frame 20. The frame 20 is fixed by connecting the rear end of the stay 23 connected to 22 to a bracket 24 protruding outside the other crawler 13.

  Further, the excavator 10 is provided with a vertical frame 25 slidable in the horizontal direction with the horizontal members 17 and 18 above and below the frame 20 as guides. A bracket portion 25a is slidably engaged with the guide portion of the upper horizontal member 17, and a bracket portion 25b is slidably engaged with the guide portion of the lower horizontal member 18. Further, the base portion of the hydraulic cylinder 26 is pivotally supported on the upper horizontal member 17, and the tip end portion of the piston rod 26 a is connected to the upper portion of the vertical frame 25 via the connecting member 27, and the base portion of the hydraulic cylinder 28 is connected to the lower horizontal member 18. And the tip of the piston rod 28a is connected to the lower portion of the vertical frame 25 via a connecting member 29.

  Further, the excavator 10 is provided with a cutter support post 30 that can be raised and lowered with respect to the vertical frame 25. 31 (see FIG. 4) is a hydraulic cylinder for raising and lowering. An endless chain cutter 32 is provided perpendicular to the cutter support post 30. 33 is a cutter post of this cutter 32, which is composed of a box frame that is long vertically, 34 is a sprocket provided at the upper end of the cutter post 33, 35 is a sprocket provided at the lower end of the post 33, and 36 is the upper and lower This is an endless chain with excavating blades that spans sprockets 34 and 35. 37 is a motor for driving the cutter, and 38 is a transmission device. In the figure, 51 is an injection device for injecting a solidified material K such as a stabilizer A or cement liquid (cement slurry) as a stabilizer into the excavated groove G. The injection device 51 is supplied from the lower end side of the cutter 32 to the stabilizer A. Or a solidifying material K such as cement liquid (cement slurry) is selectively injected.

  As shown in FIGS. 1 and 2, the construction apparatus includes a mud tank 71 to which muddy water W generated from the site is sent together with the excavator 10 provided in the self-propelled vehicle 12 described above, and the muddy water W. Vibrating sieve 72 as a means for separating soil and sand D, mud adjustment tank 73 to which classification mud W1 separated from the mud W is sent, and water is supplied into the mud adjustment tank 73 In the fresh water tank 74, the automatic measuring device 75 for detecting the concentration of the adjusted mud water W2 obtained by mixing the classified mud water W1 sent to the mud water adjustment tank 73 and the water in the fresh water tank 74, and the sewage adjustment tank 73 And an infusion solution supply device 76 to which the adjusted adjusted sewage W2 is sent.

  First, at the time of preceding excavation, as shown in FIG. 3A, the cutter 32 is suspended and inserted into the excavation hole 61 on the start end side of the underground wall construction position, and the cutter 32 is inserted into the vertical frame 25. Install. Next, in a state where the hydraulic cylinders 26 and 28 are contracted, the guide direction by the horizontal members 17 and 18 at the upper and lower parts of the frame 20 is made to coincide with the direction of the soil cement wall 1 to be constructed. It is fixed to the ground 11 with an anchor or the like so as not to move, and in this state, while driving the chain 36 of the cutter 32 by the motor 37, pressure oil is supplied to the hydraulic cylinders 26 and 28, and the piston rods 16a and 18a are supplied. The cutter 32 is moved through the vertical frame 25 while digging so as to loosen the ground 1 in the direction of the arrow in FIG. At this time, the stabilizing liquid A is injected from the injecting device 51 into the traveling direction or the excavated groove G, and the stabilizing liquid A and the earth and sand in the groove G are stirred. The stabilizer A is mainly bentonite mixed with water. By using the stabilizer A, the inside of the groove G is stabilized, and the cutter 32 is driven smoothly. This makes it easier to unravel and facilitate excavation ahead.

  When the piston rods 26a, 28a of the hydraulic cylinders 26, 28 are fully extended, the piston rods 26a, 28a are retracted, and the self-propelled vehicle 12 is moved to the right as shown in FIG. Then, the above operation is repeated again to excavate the underground wall groove G having a predetermined length. Further, the stabilizing liquid A is injected from the injection device 51 into the groove G in the traveling direction or excavated, and the stabilizing liquid A and a part of the earth and sand in the groove G are stirred. In this case, the cutter 32 can be returned to the left side in the figure to stir the groove G.

  In this way, during the previous excavation in which the stabilizing liquid A is injected, as shown in FIG. 1, the muddy water W generated from the site during construction is sent to the muddy water tank 71 through the pipeline 71A by a suction pump (not shown). If necessary, water is added to the muddy water W in the muddy water tank 71 to adjust the water content ratio. In this case, the water content ratio of the muddy water W is set to 75 to 125% in order to facilitate selection in the vibrating sieve 72. The water content is a ratio of solids such as soil particles to water (water content = water weight / solid weight × 100). In addition to earth and sand, the solid content includes bentonite contained in the stabilizer A, on-site Including silt and clay generated from. The muddy water W whose water content ratio is adjusted in the muddy water tank 71 is sieved into the earth and sand content D and the classified muddy water W1 in the vibrating sieve 72. For example, the mesh of the vibrating sieve 72 is about 1 mm mesh, and the soil particles passing through the mesh of this size are included in the classified mud water W1, for example, the classified mud water W1 having a water content ratio of 105 to 155%. The obtained and sieved soil and sand content D has a water content ratio of 20 to 40%, and this soil and sand content D is used as a civil engineering material inside or outside the construction site. On the other hand, the classified mud water W1 containing fine particles such as bentonite, silt and clay generated from the site is sent to the muddy water adjustment tank 73 through the pipe 73A, and the water in the fresh water tank 74 passes through the pipe 74A. The concentration, specific gravity, viscosity, etc. of the adjusted mud water W2 mixed with the water sent from the fresh water tank 74 and the classified mud water W1 are measured by the automatic measuring device 75 and adjusted mud water W2. Is sent to the infusion solution production device 76 through the conduit 76A, and bentonite is additionally mixed to produce the stabilization solution A. The stabilization solution A is sent to the infusion device 51 through the conduit 76B. The muddy water adjusting tank 73 is provided with stirring means 77 such as a rotary stirring blade, and the adjusted muddy water W2 is uniformly stirred by the stirring means 77.

In this way, the water content (water content ratio) of the mud water W generated by the preceding excavation is adjusted, the sand and sand content D of 1 mm or more is sieved and separated from the classified mud water W1, and the separated soil and sand content D is used as a civil engineering material. Since the classified mud water W1 contains bentonite and fine particles such as silt and clay generated from the site, the classified mud water W1 can be reused as the stabilizing liquid A to recycle the bentonite to be added. The amount used can be reduced.

  Further, the construction apparatus is provided with a filter press 81 as a dehydrating means for filtering and dewatering the classified mud water W1 with a press, if necessary. As shown in the schematic diagram of FIG. 1, the filter press 80 includes a plurality of filter plates 83 each having a plurality of filter cloths arranged between a fixed frame 81 and a clamping plate 82. A filter chamber is formed between 83 and 83, the clamping plate 82 is moved by a hydraulic cylinder (not shown), and the classified muddy water W1 in the filter chamber is pressed and filtered by a pump pressure for supplying muddy water into the filter chamber. Dehydrated earth and sand Dd and filtered water are obtained. The dehydrated earth and sand Dd is used as a civil engineering material inside or outside the construction site, and the filtered water passes through the pipe 80B to the fresh water tank. 74 and further sent from the fresh water tank 74 to the muddy water adjustment tank 73.

  And when there is a high necessity for the earth and sand D as a civil engineering material to be used in the field, the classified mud water W1 is sent to the filter press 81 through the pipe line 80A connecting the vibrating sieve 72 and the filter press 81, For example, dehydrated earth and sand Dd having a water content of 20 to 40% can be obtained, and this is reused as a civil engineering material.

  Therefore, in the above method, classification can be performed using a construction machine conventionally used in civil engineering work without using a complicated sorting device, and the classified mud water W1 is made of silt, clay, bentonite. Since the fine granule content is contained, the amount of bentonite used can be reduced by mixing the classified mud water W1 into the stabilizing liquid A. Moreover, the supply amount of the classified sediment component Dd can be adjusted by mechanically dewatering the classified mud water W by the press dewatering means. Moreover, the generation of industrial waste can be eliminated by controlling the construction waste soil.

  In particular, it is effective when there are few fine grains (10% or less) in the ground at the excavation site, and where there is a lot of gravel and sand, a lot of bentonite is required to ensure the stability of the groove wall. At this time, since the amount of bentonite used can be reduced by mixing the classified mud water W1 containing fine particles into the stabilizing liquid A, the construction is economical.

  Next, in the solidification stage in which the solid cement K is injected to build the soil cement wall 1, as shown in FIG. 3 (A), the cutter 32 is inserted into the excavation hole 61 on the start end side of the underground wall construction position. The cutter 32 is attached to the vertical frame 25. Next, in a state where the hydraulic cylinders 26 and 28 are contracted, the guide direction by the horizontal members 17 and 18 at the upper and lower parts of the frame 20 is made to coincide with the direction of the soil cement wall 1 to be constructed. It is fixed to the ground 11 with an anchor or the like so as not to move, and in this state, while driving the chain 36 of the cutter 32 by the motor 37, pressure oil is supplied to the hydraulic cylinders 26 and 28, and the piston rods 16a and 18a are supplied. The cutter 32 is moved through the vertical frame 25 while excavating the ground 1 in the direction of the arrow in FIG. At this time, the solidification material K is injected from the injection device 51 into the groove G in the traveling direction or excavated, and the solidification material K and the earth and sand in the groove G are agitated. As the solidifying material K, cement slurry is used.

  When the piston rods 26a, 28a of the hydraulic cylinders 26, 28 are fully extended, the piston rods 26a, 28a are retracted, and the self-propelled vehicle 12 is moved to the right as shown in FIG. The groove G for excavating a predetermined length of the underground wall is excavated by repeating the above operation again. Further, the solidifying material K is injected from the injecting device 51 into the groove G in the traveling direction or excavated, and the solidified material K and a part of the earth and sand in the groove G are stirred. In this case, the cutter 32 can be returned to the left side in the figure to stir the groove G.

  In the solidification stage in which the solidification material K is injected in this way, the same apparatus as shown in FIG. 1 is used, and as shown in FIG. 2, the muddy water W generated from the site at the time of construction is sucked by a suction pump (not shown). Is sent to the muddy water tank 71 through the pipe 71A and water content is adjusted by adding water to the muddy water W in the muddy water tank 71 as necessary. In this case, the water content ratio of the muddy water W is set to 75 to 125% in order to facilitate selection in the vibrating sieve 72. The water content is the ratio of solids such as soil particles to water (water content = water weight / solid weight × 100). The solid content includes cement contained in the solidifying material K in addition to earth and sand, stable It contains bentonite contained in liquid A, silt and clay generated from the site. The muddy water W whose water content ratio is adjusted in the muddy water tank 71 is sieved into the earth and sand content D and the classified muddy water W1 in the vibrating sieve 72. For example, the mesh of the vibrating sieve 72 is about 1 mm mesh, and the soil particles passing through the sieve of this size are included in the classified mud water W1, for example, the classified mud water W1 having a water content ratio of 85 to 135%. The obtained and sieved soil and sand content D has a water content ratio of 28 to 48%, and this soil and sand content D is used as a civil engineering material inside or outside the construction site. On the other hand, the classified mud water W1 containing fine particles such as cement, bentonite, silt and clay generated from the site is sent to the mud adjustment tank 73 through the pipe 73A, and the water in the fresh water tank 74 is sent to the pipe. The concentration, specific gravity, viscosity, etc. of the adjusted mud water W2 mixed with the water sent from the fresh water tank 74 and the classified mud water W1 are measured by the automatic measuring device 75 and adjusted. The muddy water W2 is sent to the injection liquid production apparatus 76 through the pipe line 76A, and the cement is further mixed to produce a field solidified material K such as cement slurry. The solidification material K passes through the pipe line 76B and the injection apparatus Sent to 51.

In this way, the water content (moisture content ratio) of the mud water W generated by the solidification stage is adjusted, and the sand and sand content D of 1 mm or more is sieved and separated from the classified mud water W1, and the separated soil and sand content D is used as a civil engineering material. Since the classified mud water W1 contains fine particles such as cement, bentonite, silt and clay generated from the site, the classified mud water W1 is added by reusing it to the solidifying material K. The amount of cement used can be reduced.

  In addition, the construction apparatus is provided with a filter press 81 as a dewatering means for filtering and dewatering the classified mud water W1 with a press, if necessary. Dd and filtered water are obtained, and the dehydrated earth and sand Dd is used as a civil engineering material inside or outside the construction site, and the filtered water is sent to the fresh water tank 74 through the pipe line 80B. To the muddy water adjustment tank 73.

  And when there is a high necessity for the earth and sand D as a civil engineering material to be used in the field, the classified mud water W1 is sent to the filter press 81 through the pipe line 80A connecting the vibrating sieve 72 and the filter press 81, For example, dehydrated earth and sand Dd having a water content ratio of 30 to 50% is obtained.

  Therefore, in the above method, classification can be performed using a construction machine conventionally used in civil engineering work without using a complicated sorting device, and the classification mud water W1 in the solidification stage is used as the solidification material K. By doing so, the amount of cement used can be reduced by the cement contained in the muddy water W generated on site. Moreover, the supply amount of the classified sediment component Dd can be adjusted by mechanically dewatering the classified mud water W by the press dewatering means. Moreover, the generation of industrial waste can be eliminated by controlling the construction waste soil.

Thus, in this embodiment, corresponding to claim 1, together with the drilling location to build a diaphragm wall serving soil cement wall 1 by excavating equipment 10, the preceding excavation was Tsu line by injecting a stabilizing solution A Then, with the chain-type cutter 32 built in the excavation site where the preceding excavation was performed in the solidification stage , the cutter 32 was rotated and the solidification material K was poured into the excavated soil while moving the cutter 32, and the soil The cement wall 1 is formed , the muddy water W generated in the preceding excavation is collected, the sediment D is separated from the collected muddy water W, and the separated sediment classification is obtained by separating the separated sediment D and the sediment D. a construction method for recycling to that land in the continuous wall and mud W1, in the preceding drilling, the water content ratio was adjusted by adding water to the collected mud W, a muddy water W that adjusting the water content ratio, In vibrating sieve 72, earth and sand D and classification mud W1 The classified muddy water W1 is reused as the stabilizing liquid A, and the muddy water W generated when the solidifying material K is injected is recovered in the solidification stage, and the water content is added to the recovered muddy water W. In the vibration sieve 72, the mud water W with the adjusted water content ratio is sieved into the earth and sand D and the classified mud water W1, and the classified mud water W1 is reused as the solidified material K. Can be used effectively, and in the preceding excavation, the classified mud water W1 contains the components of the stabilizer A and fine particles such as silt and clay generated from the site. It can be reused, the amount of additive components used can be reduced, and the earth and sand content D can be reused for civil engineering materials. In the solidification stage, the classified mud water W1 can be reused as the solidification material K.

In this way, in this embodiment, corresponding to claim 2, since the earth and sand portion D sieved from the muddy water W adjusted in the water content ratio is reused in the solidification stage , the earth and sand portion is reused. In addition, the soil generated on site can be reduced.

As described above, in this embodiment, corresponding to claim 3, it is used in the construction method of the underground continuous wall according to claim 1 or 2, and excavates the position where the soil cement wall 1 as the underground wall is constructed. In addition, the excavator 10 for performing the excavation by injecting the stabilizing liquid A and the solidified material K while rotating the cutter 32 and moving the cutter 32 while being built in the excavation site where the excavation has been performed. injected into the chain cutter 32 to form a soil cement wall 1, from and a Dofurui 72 vibration you separate the sediment fraction D from muddy water W that adjusting the water content ratio generated in the solidification stage and the preceding digging By constructing the soil cement wall 1 using this apparatus, the muddy water W generated in the preceding excavation and the solidification stage can be recovered, and the muddy water W that conventionally requires disposal or treatment can be effectively used.

Further, in the present embodiment in this manner, corresponding to claim 4, serving as the dehydration means sediment fraction D remaining sediment fraction D The separated separated liquid serving classifying mud W1 by vibration Dofurui 72 is dehydrated by a press filter Since the press 81 is provided, the earth and sand D can be separated by the vibrating sieve 72, and the earth and sand Dd can be separated by the filter press 81 and reused as a civil engineering material without providing a dedicated separation facility or the like. .

Moreover, the muddy water W generated in the solid-reduction step was collected, the sediment fraction D was separated from the recovered mud W, separated liquid serving classification mud W1 and sediment fraction separated the separated sediment fraction D and sediment fraction D Since D is reused, it is possible to effectively use the muddy water W that conventionally required disposal or treatment. For example, the classified muddy water W1 is a cement component and a component of the stabilizer A, and silt and clay generated from the field. Since fine particles such as min are included, cement components and the like can be reused, and the amount of cement used can be reduced.

Further, as an effect on the embodiment, full Irutapuresu 81, the remaining sediment fraction D in classification mud W1 is press dewatering means for dewatering by pressing, it is possible to efficiently dewatered by the use of this.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, the excavator used for the preceding excavation may be of an axial rotary excavation type such as an earth auger other than the type using the chain cutter of the embodiment. Moreover, although the 1-mesh mesh vibration sieve was shown in the Example, even if it uses a 0.5-2 millimeter mesh vibration sieve, it can isolate | separate into a desired earth and sand content and classification muddy water.

It is explanatory drawing of the construction apparatus which shows one Example of this invention, and shows the construction state at the time of preceding excavation. It is explanatory drawing of a construction apparatus same as the above, and shows the construction state of a solidification stage. It is sectional drawing explaining the construction method as above, FIG. 3 (A) shows the state which attached the cutter to the vertical frame and built it in the ground, FIG. 3 (B) (C) is excavation and solidification by a cutter. shows the stirring step of wood or the like. It is sectional drawing at the time of construction which looked at the construction apparatus from the front same as the above. It is sectional drawing at the time of construction which looked at the construction apparatus from the side same as the above. It is a top view of a construction apparatus same as the above.

Explanation of symbols

1 Soil cement wall (underground wall)
10 Drilling rig
32 Chain cutter
72 Vibrating sieve
81 Filter press (dehydration means)
G Groove W Muddy water W1 Classification muddy water (separate)
D Sediment content Dd Sediment content A Stabilizer K Solidified material

Claims (4)

With drilling position to build underground wall by excavating equipment, after the Tsu line prior excavation by injecting stabilizing solution, but built up a chain cutter drilling locations were the preceding excavation by the solidification stage state , rotates the cutter, the diaphragm wall formed by injecting a solidifying material into excavated sand while moving the cutter, the leading drilling in generated mud collected, the sediment fraction is separated from the recovered mud , a the separated construction methods of sediment content and sediment content of the separated you reuse the separated liquid earth during continuous wall,
In the preceding excavation, water is added to the recovered muddy water to adjust the water content ratio, and the muddy water having the adjusted water content ratio is sieved into the earth and sand and the separated liquid in a vibrating sieve, and the separated liquid is Reuse it as a stabilizer,
In the solidification stage, the muddy water generated when the solidified material is injected is recovered, water is added to the recovered muddy water to adjust the water content ratio, and the muddy water whose adjusted water content ratio is adjusted, A method for constructing an underground continuous wall, characterized in that the separated liquid is sieved to a separated liquid and the separated liquid is reused as the solidified material . 2. The underground continuous wall construction method according to claim 1 , wherein the soil and sand content sifted from the muddy water whose water content ratio is adjusted in the solidification stage is reused . Used in the construction method according to claim 1 or 2 underground continuous wall according, with drilling position for constructing the underground walls, the said drilling apparatus by injecting the stabilizing solution performs the previous excavation, the solidified in stage, built up but the state drilling locations were the preceding excavation, to rotate the cutter, said chain type cutter to form a diaphragm wall by injecting the solidifying material while moving said cutter, An underground continuous wall construction apparatus, comprising: the vibrating sieve that separates soil and sand from the preceding excavation and the muddy water generated in the solidification stage and adjusted in the water content ratio . 4. The underground continuous wall construction apparatus according to claim 3, further comprising a dehydrating means for dewatering the earth and sand remaining in the separated liquid obtained by separating the earth and sand with the vibrating sieve.

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