JP4091695B2 - Underground continuous wall and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground continuous wall having water permeability and a construction method thereof.
[0002]
[Prior art]
The underground continuous wall is used for underground structures, revetment earth retaining walls, water blocking walls, etc., and its construction method is excavating the ground into a groove shape while injecting cement-based drilling fluid such as cement milk, Cement-based drilling fluid and soil are mixed to build a soil cement column wall, or the ground is excavated into a groove shape while injecting hole wall collapse prevention liquid such as bentonite mud water, There is a construction method that uses the muddy water in the excavation hole to replace concrete. Alternatively, a method of constructing a column wall by inserting a precast member into a solidified material such as cement-based drilling fluid in a drilling hole is considered.
[0003]
Solid materials such as cement-based drilling fluid, bentonite mud, concrete, etc. used when constructing continuous underground walls are fluid before congealing and impervious after congealing. It is difficult to give the continuous wall itself water permeability later.
[0004]
For example, as shown in FIG. 21, even if the opening 2 is formed in the precast member 1 or the opening 2 is filled with a water-permeable material 3 such as sand or gravel, the opening 2 is not condensed. Solidified material 4 such as cement-based drilling fluid flows in or a film 4a of the solidified material 4 is formed between the water-permeable material 3 and the excavation hole 5, and the water permeability of the entire wall is lost. In addition, when the water-permeable material is previously kneaded in the solidified material 4 and solidified, the water-permeable material is not continuous and similarly the water-permeable property is lost.
[0005]
As described above, since the water permeability of the underground continuous wall is impaired, the following measures are usually taken.
[0006]
For example, when the underground structure shown in FIG. 22 is constructed, the impervious underground continuous wall 6 is sand, gravelly permeated water through which the water flow of the underground water vein (hereinafter referred to as “groundwater flow”) flows. When construction is made so that the clay-like impermeable layer 8 is inserted through the layer 7, the permeable layer 7 is divided by the underground continuous wall 6, and the groundwater level 9 descends downstream of the underground continuous wall 6 as it is. There is a problem that land subsidence 9b is caused by 9a.
[0007]
For this reason, the wells 10 and 11 are provided on the upstream side and the downstream side of the underground continuous wall 6, respectively, the groundwater 13 is pumped up by the submersible pump 12 installed in the upstream well 10, and the downstream well 11 is passed through the hose 14. The water is supplied to the ground so that the groundwater flow is not blocked.
[0008]
In addition, as shown in FIG. 23, when the underground revetment is constructed by constructing an impermeable underground continuous wall 17 obliquely along the slope 16 of the river 15, the underground continuous wall 17 Buoyancy F occurs due to the difference in water level ΔL between the groundwater level L acting on the back surface of the river and the water level of the river 15 acting on the surface of the underground continuous wall 17, and there is a problem that the underground continuous wall 17 rises. After the impermeable underground continuous wall 17 is constructed, an opening 18 is formed in the underground continuous wall 17 from the slope 16, and the water permeable material 19 is filled in the opening 18.
[0009]
[Problems to be solved by the invention]
In this way, any underground continuous wall can be excavated again after the construction of the continuous wall is completed, to dig a well for circulating groundwater flow, or to open an opening in the continuous wall. Therefore, there is a problem that the work is complicated and expensive.
[0010]
This invention is made | formed in view of such a point, and it aims at providing the underground continuous wall which has the water permeability which can be constructed | assembled easily and cheaply, and its construction method.
[0011]
[Means for Solving the Problems]
The invention described in claim 1 injects a water-impermeable solidifying material into the underground groove provided from the underground water-permeable layer to the water-impermeable layer positioned below the water-permeable layer, In the underground continuous wall in which a precast member is inserted into the solidified material in a soft state before setting and a wall member is continuously constructed by the solidified material and the precast member, corresponding to the impermeable layer in the ground wherein the permeable holes for communicating the one side and the other side provided at the lower portion of precast members continuously arranged in the hand vertically on top of the permeable holes along one side and the other side surface of the precast members In addition , the water-permeable grooves corresponding to the water- permeable layer in the ground and the water-flowing jig fitted in the whole length of the water-permeable grooves and installed in the ground together with the precast member are pulled out after the solidification material is condensed. Before Is the permeability groove underground continuous wall comprising a cutout groove is communicating opening into the aquifer by notching the solidifying material over the entire length of the permeability groove.
[0012]
Thus, even if the water permeable groove provided in the precast member is communicated with the water permeable layer through the notch groove provided in the solidified material, and the water permeable hole of the wall member is located in the water impermeable layer, From the one side permeable layer located on the upper side of the layer, through one notch groove facing this permeable layer, one side permeable groove, one water permeable hole, the other side permeable groove, and the other side notched groove, The groundwater flow communicates with the other side permeable layer facing the notch on the side.
[0013]
The invention described in claim 2 is the underground continuous wall according to claim 1, in which the water permeable groove is filled with a water permeable material.
[0014]
Thereby, a water-permeable groove is not blocked by collapsed earth and sand.
[0015]
請 Motomeko invention described in 3, in which the wall member in claim 1 or 2 underground continuous wall according is provided in a vertical shape.
[0016]
Thereby, the possibility that the wall member constructed vertically from the water-permeable layer to the water-impermeable layer blocks the groundwater flow of the water-permeable layer is prevented.
[0017]
According to a fourth aspect of the present invention, the wall member in the underground continuous wall according to the first or second aspect is provided in an inclined shape.
[0018]
Thereby, a water level difference is prevented from occurring between one side and the other side of the wall member constructed in an inclined manner from the water-permeable layer to the water-impermeable layer, and the possibility that buoyancy due to the water level difference acts on the wall member is prevented.
[0019]
The invention described in claim 5 includes a wall member in which a water permeable hole is provided in the lower portion and a water permeable groove is continuously provided in the upper portion of the water permeable hole, and a long and hollow shape fitted in the water permeable groove in the wall member. The water passage jig is installed in the ground integrally, and only the water passage jig is pulled out of the water passage groove of the wall member, so that it is preloaded in the tubular jig body of the water passage jig. This is a method for constructing a continuous underground wall in which a water permeable material is filled into a water permeable groove and at the same time a notch groove is opened from the water permeable groove to the soil wall side by a groove excavation claw provided at the tip of the tubular jig body.
[0020]
Thereby, by pulling out the water passage jig that is installed in the ground integrally with the wall member, the water permeable groove of the wall member is filled with the water permeable material, and the notch groove is opened from the water permeable groove to the soil wall side. .
[0021]
According to a sixth aspect of the present invention, the wall member in the underground continuous wall construction method according to the fifth aspect of the present invention is a claw extrusion that causes the groove excavation claw to protrude toward the earth wall side in conjunction with the drawing operation of the water passage jig. It has a part.
[0022]
Thereby, the nail | claw extrusion part of a wall member makes the groove excavation claw of a water flow jig protrude to the earth wall side, and forms a notch groove.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0024]
FIGS. 1 to 3 show an embodiment in which the underground continuous wall according to the present invention is applied to a vertical wall. A groove 22 having a predetermined depth is excavated vertically on the ground 21, and a cement-based drilling fluid or Impermeable solidified material 23 such as bentonite mud is injected. By inserting a large number of impermeable precast members 24 formed into a sheet pile shape with concrete into the solidified material 23 in a soft state before setting, the solidified material 23 and the precast members 24 The wall member 25 is continuously constructed to build the underground continuous wall vertically.
[0025]
As shown in FIG. 1, the sheet pile-shaped precast member 24 forming the wall member 25 has a V-shaped concave groove 26 on one end surface and a V-shaped convex portion 27 on the other end surface. By positioning the V-shaped concave groove 26 and the V-shaped convex portion 27 of each precast member 24 to each other, the positions of the precast members 24 are positioned.
[0026]
As shown in FIG. 2, the wall member 25 has a permeable U-shaped tube 28 integrally incorporated in the lower part of the precast member 24, and one side surface and the other side surface of the precast member 24 are formed inside the permeable U-shaped tube 28. Water-permeable holes 29 are provided, and water-permeable grooves 31 are continuously provided on both side surfaces of the precast member 24 and in the solidified material 23 at the top of the water-permeable holes 29. The water-permeable grooves 31 and the water-permeable holes 29 Is filled with a water-permeable material 32 such as sand or gravel. The water permeable material 32 prevents the water permeable grooves 31 and the water permeable holes 29 from being blocked by collapsed earth and sand.
[0027]
As shown in FIG. 3, the water permeable groove 31 provided in the wall member 25 is permeable on the soil wall side through a solidified material 23 of the wall member 25 and a notch groove 34 formed in the earth wall 33. A communication opening is formed in the layer 35.
[0028]
Accordingly, the water-permeable layer 35 is blocked by the water-impermeable solidifying material 23 and the precast member 24, and the water-permeable layer 36 located on the lower side of the water-permeable layer 35 has a water-permeable U-shaped tube 28, that is, a water-permeable hole. Even when 29 is located, the groundwater flow in the permeable layer 35 permeates the wall member 25 as follows.
[0029]
That is, from one side of the water-permeable layer 35 located above the water-impermeable layer 36, one side of the cut-out groove 34 facing the water-permeable layer 35, one side of the water-permeable groove 31, and the water-permeable holes 29 in the water-permeable U-shaped pipe 28. Since the groundwater flow is communicated with the other side permeable layer 35 facing the other side cutout groove 34 through the other side permeable groove 31 and the other side cutout groove 34, the impermeable layer through the permeable layer 35. It is possible to prevent the wall member 25 constructed vertically up to 36 from blocking the groundwater flow of the permeable layer 35.
[0030]
4 to 7 show the precast member 24. The water-permeable U-shaped tube 28 is integrally provided at the lower portion, and a claw storage recess 37 is formed on the upper side of the water-permeable U-shaped tube 28. A claw extruding portion 38 is provided on the left and right sides of the groove 31a having a semicircular cross section that forms the water permeable groove 31 above 37. The functions of the nail storage recess 37 and the nail pusher 38 will be described later.
[0031]
FIGS. 8 and 9 show a long and hollow water passing jig 41 which is integrally fitted to the precast member 24 and installed in the ground. The water flow jig 41 includes a tubular jig body 42 formed of a pipe having a circular cross section that is fitted in the semicircular groove 31a of the precast member 24, and a pin near the lower end of the tubular jig main body 42. A groove excavation claw 44 pivotally supported by 43 is provided.
[0032]
The tubular jig main body 42 of the water flow jig 41 has a small-diameter portion 46 with a suspension 45 attached integrally at the upper end and fitted into the opening of the water-permeable U-shaped tube 28 of the precast member 24 at the lower end. And the lower end of the small diameter portion 46 is opened.
[0033]
8 and 9, the groove excavation claw 44 includes a pair of claw plates 47 formed in a U-shape, as shown in FIG. This is pivotally supported by a pin 43 on the side surface.
[0034]
As shown in FIGS. 11 and 12, each claw plate 47 of the groove excavation claw 44 includes a shaft support portion 48 that fits the pin 43, an excavation edge 49 provided on the opposite side, and a tubular jig body. Having a pressed portion 50 pressed by the claw extruding portion 38 of the precast member 24 in conjunction with the pulling operation of 42, and the pressed portion 50 is pressed to project the excavation edge 49 toward the earth wall 33 side. It is.
[0035]
Then, as shown in FIG. 11, the precast member 24 provided with the water-permeable U-shaped tube 28 in the lower portion and the semicircular cross-sectional groove 31a continuously formed in the upper portion of the water-permeable U-shaped tube 28, and the precast A long and hollow water passage 41 fitted in the groove 31a having a semicircular cross section of the member 24 is integrally installed in the ground. At this time, the small diameter portion 46 of the water passage jig 41 is fitted into the upward opening 28 a of the water-permeable U-shaped tube 28.
[0036]
Then, as shown in FIG. 12, by pulling a wire (not shown) hung on the hanger 45 by a hydraulic excavator or the like, the tubular jig body 42 of the water passing jig 41 is made to be a semicircle of the precast member 24. By pulling out along the cross-sectional groove 31a, the water permeable material 32 such as sand and gravel previously loaded in the tubular jig body 42 of the water flow jig 41 is passed through the water permeable holes 29 and the tubular jig body 42. The groove excavation claw 44 provided at the distal end portion of the tubular jig body 42 is filled with the permeable groove 31 formed in the precast member 24 and the solidified material 23 as a drawing trace space, and at the same time, the claw extrusion portion 38 of the wall member 25. The cut groove 34 is opened from the water permeable groove 31 to the dirt wall 33 side so that the solidified material 23 and the opposite earth wall 33 are torn by the excavation edge 49 of the groove excavation claw 44. To do.
[0037]
Next, FIG. 13 shows an underground structure formed by vertical underground continuous walls, and the permeability of the underground continuous wall will be described by taking this underground structure as an example.
[0038]
For example, the impermeable wall member 25 is constructed from the sand and gravel permeable layer 35 to the clayy impermeable layer 36, and the ground surrounded by the wall member 25 is dug down to the upper side of the underground water flow 51. When the work floor 52 having a certain space is formed, the groundwater flow 51 of the permeable layer 35 located on the upstream side of the left wall member 25 has a left notch groove 34 facing the permeable layer 35, Work space floor facing the right notch groove 34 through the water permeable material 32 in the water permeable groove 31, the water permeable hole 29 in the permeable U-shaped pipe 28, the water permeable material 32 in the right permeable groove 31 and the right notch groove 34. It flows to the permeable layer 35 below 52.
[0039]
Further, the groundwater flow in the permeable layer 35 below the work floor 52 is divided into a left notch groove 34 provided in the right wall member 25, a permeable material 32 in the left permeable groove 31, and a permeable U-shaped pipe 28. The water flow hole 29, the water permeable material 32 in the right water permeable groove 31, and the right notch groove 34 flow to the water permeable layer 35 located on the downstream side of the right wall member 25.
[0040]
In this way, even when the impermeable wall member 25 is vertically constructed through the water permeable layer 35 to the water impermeable layer 36 and the water permeable U-shaped pipe 28 is located in the water impermeable layer 36, The groundwater flow in the layer 35 passes through the wall member 25 through a bypass path formed by a water permeable groove 31 provided in the wall member 25, a water permeable hole 29 in the water permeable U-shaped pipe 28, and the like. It is possible to prevent ground subsidence due to a drop in the groundwater level in the permeable layer 35 located on the downstream side.
[0041]
Next, FIGS. 14 to 19 show an embodiment in which the underground continuous wall according to the present invention is applied to an inclined wall, and the underground continuous wall is constructed obliquely along the slope 54 of the river 53. This is an example of building a revetment.
[0042]
As shown in FIG. 14, this underground revetment has a wall member 25 inclined in the ground, and has a water permeable hole 29 in the lower part of the wall member 25 that allows one side and the other side to communicate with each other. A U-shaped pipe 28 is provided, and a water permeable groove 31 is continuously provided above the water permeable hole 29 on one side surface and the other side surface of the wall member 25, and a notch groove 34 extends from these water permeable grooves 31 to the soil wall side. Is open. Further, the water permeable groove 31 is filled with a water permeable material 32, and the water permeable material 32 prevents the water permeable groove 31 from being blocked by collapsed earth and sand.
[0043]
And even if the water-impermeable wall member 25 is constructed in an inclined manner up to the water-impermeable layer 36 by blocking the water-permeable layer 35, the water-permeable layer 35 faces the water-permeable layer 35 from the upstream water-permeable layer 35. It faces the notch groove 34 on the other side through the notch groove 34 on one side, the permeable groove 31 on one side, the permeable hole 29 of the permeable U-shaped tube 28, the permeable groove 31 on the other side, and the notch groove 34 on the other side. A groundwater flow flows to the permeable layer 35 on the downstream side.
[0044]
Thus, since the groundwater flow of the permeable layer 35 passes through the wall member 25 so as to bypass the permeable U-shaped pipe 28, the wall member 25 will be pushed up when the groundwater flow is blocked by the wall member 25. It is possible to prevent the buoyancy described above from acting on the upstream wall surface of the wall member 25.
[0045]
FIGS. 15 to 19 show an example of construction when the underground type revetment shown in FIG. 14 is constructed. As shown in FIGS. 15 and 16, excavation of the surface layer groove 55 along the river is performed by a hydraulic excavator. Then, an excavation / stirring device (not shown) is inserted into the ground obliquely along the slope 54 of the river 53 from the surface groove 55, and the oblique groove 22 is continuously excavated in the ground. The impermeable solidified material 23 such as cement milk mud is injected into the groove 22, and the precast member 24 is gripped by a clamp or the like attached in place of the bucket of the excavator in a soft state where the solidified material 23 does not solidify. Then, the precast member 24 and the water passage jig 41 integrally attached to the precast member 24 are inserted into the solidified material 23 in a soft state.
[0046]
Waiting for the solidifying material 23 to condense, as shown in FIGS. 17 to 18, the tubular jig body 42 of the water passing jig 41 fitted in the groove 31a of the semicircular cross section of the precast member 24 is provided. By pulling through a wire with a hydraulic excavator or the like, a water permeable groove 31 is formed in the precast member 24 and the solidified material 23 as a drawing trace space of the tubular jig body 42, and the tubular jig body of the water passing jig 41 The water permeable material 32 loaded in advance in 42 is filled into the water permeable groove 31, and at the same time, the groove excavation claw 44 provided at the distal end portion of the tubular jig body 42 is extruded by the claw extruding portion 38 of the precast member 24. The solidified material 23 and the opposing soil wall are cut by the groove excavation claw 44, and a notch groove 34 is opened from the water permeable groove 31 to the soil wall side.
[0047]
In this way, as shown in FIG. 19, the wall member 25 in which the solidifying material 23 is filled with the water-permeable material 32 on both sides of the precast member 24 is continuously applied along the slope of the river, Build underground revetment with permeability. At this time, the water permeable groove 31 provided in the precast member 24 of the wall member 25 passes through the solidified material 23 of the wall member 25 and the cutout groove 34 formed in the earth wall, and the water permeability on the dirt wall side. A communication opening is formed in the layer 35.
[0048]
As described above, the dedicated precast member 24 and the water passage jig 41 are set in the excavation groove during the construction of the underground continuous wall, and after the solidification material 23 is condensed, the water passage jig 41 is pulled out. By providing a notch groove 34 through which water can be passed to the soil and the impermeable solidifying material 23 by the water flow jig 41, and simultaneously filling the water permeable material 32 into the cavity after the water flow jig 41 is pulled out, The underground continuous wall with water permeability can be constructed easily and inexpensively.
[0049]
Next, another embodiment different from the above embodiment will be described.
[0050]
Although the groove excavation claw 44 of the water flow jig 41 requires the claw extruding portion 38 of the precast member 24, the present invention is not limited to this. For example, FIG. 20 (A), (B) , (C), a non-return claw-shaped groove excavation claw 44a may be pivotally supported by a tubular jig body 42a by a pin 43a.
[0051]
This groove excavation claw 44a is provided with an excavation edge 49a on the side protruding from the shaft support portion by the pin 43a, and on the opposite side, an engagement groove 50a for restricting the rotation range of the groove excavation claw 44a is concentric with the pin 43a. A pin-shaped stopper 50b formed from the tubular jig body 42a is engaged with the engaging groove 50a.
[0052]
As shown in FIG. 20 (B), when the water flow jig 41a is inserted, an upward rubbing resistance force from the earth wall acts on the excavation edge 49a of the groove excavation claw 44a, and the groove excavation claw 44a. Since the upward fluid resistance from the solidified material 23 before condensing acts on the lower side of the pin 43a more than the right side on the left side of the pin 43a, the groove excavation claw 44a rotates clockwise and its excavation edge 49a escapes upward Then, the tubular jig body 42a is closed so as to be accommodated within the outer diameter, and at this time, the counterclockwise end of the engagement groove 50a is locked by the stopper 50b.
[0053]
On the other hand, as shown in FIG. 20 (C), when the water passing jig 41a is pulled upward, the downward resistance force from the solidified material 23 on the upper side surface of the groove excavation claw 44a is from the right side on the left side of the pin 43a. In addition, since the rubbing resistance force downward from the earth wall acts on the excavation edge 49a of the groove excavation claw 44a, the groove excavation claw 44a rotates counterclockwise, and the excavation edge 49a becomes the tubular jig body 42a. The notch groove 34 is formed in the solidified material 23 and the earth wall by the excavation edge 49a which is opened so as to protrude from the inside diameter of the outer diameter and the angle is fixed in a state where the clockwise end of the engagement groove 50a is locked by the stopper 50b. Can be opened. When the check claw-shaped groove excavation claw 44a is used, the claw extruding portion 38 of the precast member 24 is not necessary.
[0054]
The wall member 25 does not necessarily include the precast member 24. For example, in the case of cast-in-place concrete or soil cement, the permeable U-shaped tube 28 is welded to a reinforcing material such as a reinforcing bar, and the reinforcing material is used. It is good to attach the water flow jig 41 to the front.
[0055]
Furthermore, since the wall member 25 is constituted by the solidifying material 23 and the precast member 24, the water permeable groove 31 may be provided only in one of them. For example, instead of forming the semicircular cross-sectional groove 31a in the precast member 24, only the solidifying material 23 may be provided with a water permeable groove formed in the extraction trace space of the tubular jig body 42.
[0056]
In addition, the wall member 25 injects the solidified material 23 into the ground, and before the solidified material 23 congeals, a bag material containing a reinforcing material is inserted into the solidified material 23 instead of the precast member 24. The wall member 25 may be formed by injecting mortar or concrete into the bag material. In that case, both ends of the permeable U-shaped pipe 28 welded to the reinforcing material are connected to the outside of the bag material. The water passage jig 41 is preferably attached to the outside of the bag material.
[0057]
【The invention's effect】
According to the first aspect of the present invention, the water passage jig and the water permeable grooves on both sides are provided in the precast member of the wall member , and the water permeable jig installed in the ground together with the precast member is fitted over the entire length of the water permeable groove. Since the notch groove is provided in the solidified material of the wall member over the entire length of the water permeable groove by pulling out after the solidified material congeals , even if this wall member is constructed to the impermeable layer through the water permeable layer, It is possible to connect the groundwater flow from the permeable layer to the other permeable layer through the notched groove on one side, the permeable groove on one side, the permeable hole, the permeable groove on the other side, and the notched groove on the other side, and requires water permeability. It is possible to provide a continuous underground wall suitable for the location.
[0058]
According to the second aspect of the present invention, since the water permeable groove is filled with the water permeable material, it is possible to prevent the water permeable groove from being blocked by the collapsed earth and sand.
[0059]
According to the invention 請 Motomeko 3 described can provide underground continuous wall can support construction which can be separated underground water vein in a continuous wall becomes a problem.
[0060]
According to invention of Claim 4, the underground continuous wall which can respond to the construction which the buoyancy produced by the water level difference of the front and back of a diagonal continuous wall becomes a problem can be provided.
[0061]
According to the fifth aspect of the present invention, the wall member and the water passage jig are integrally installed in the ground, and only the water passage jig is pulled out to fill the water-permeable material and open the notch groove. Since it is a construction method, underground continuous walls that require water permeability can be constructed at low cost. In particular, the water-permeable groove can be easily filled with the water-permeable material by simply pulling out the water passage jig, and the notch groove can be easily opened from the water-permeable groove to the soil wall side.
[0062]
According to the sixth aspect of the present invention, the groove excavation claw of the water passage jig can be reliably protruded toward the earth wall side by the claw extruding portion of the wall member, so that the cutout groove can be formed reliably.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing an embodiment in which an underground continuous wall according to the present invention is applied to a vertical wall.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a plan view of a precast member used for the continuous wall.
FIG. 5 is a front view of the precast member.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
FIG. 8 is a front view showing a water passing jig used for the construction of the continuous wall.
FIG. 9 is a cross-sectional view of the water passing jig.
FIG. 10 is a bottom view of the water passing jig.
FIG. 11 is a cross-sectional view showing an installed state of the water passing jig as described above.
FIG. 12 is a cross-sectional view showing a drawing start state of the water passing jig same as above.
FIG. 13 is a cross-sectional view showing an underground structure formed by the continuous wall.
FIG. 14 is a cross-sectional view showing an embodiment in which an underground continuous wall according to the present invention is applied to an inclined wall.
FIG. 15 is a cross-sectional view showing a state in the middle of inserting the precast member and the water passage jig into the solidified material in the construction of the inclined wall.
FIG. 16 is a cross-sectional view showing a state in which insertion of the precast member and the water passage jig is completed.
FIG. 17 is a cross-sectional view showing a state immediately after the extraction of the water passage jig is started.
FIG. 18 is a cross-sectional view showing a state where the water passing jig is being pulled out and in a state where the pulling is completed.
FIG. 19 is a sectional view showing a state in which the construction of the inclined wall is completed.
20A is a plan view showing another embodiment of the water passing jig, FIG. 20B is a front view showing a closed state of the groove excavation claw when the water passing jig is inserted, and FIG. It is a front view which shows the groove excavation nail opening state at the time of extraction of a water flow jig.
FIG. 21 is a cross-sectional view showing a construction example of a conventional underground continuous wall.
FIG. 22 is a cross-sectional view showing an example of countermeasures against groundwater flow when a conventional underground structure is constructed.
FIG. 23 is a cross-sectional view showing an example of countermeasures for groundwater flow when a conventional underground revetment is constructed.
[Explanation of symbols]
22 Underground ditch
23 Solidification material
24 Precast members
25 Wall members
29 Water-permeable hole
31 Permeable groove
32 Water-permeable material
34 Notch groove
35 water permeable layer
36 impermeable layer
38 Claw extruding part
41 Water flow jig
42 Tubular jig body
44 Groove claw

Claims (6)

Injecting a water-impermeable solidifying material into the underground groove formed from the underground water-permeable layer to the impermeable layer located below it, and in the solidified material in a soft state before the solidified material congeals. In the underground continuous wall in which a precast member is inserted into and a wall member is continuously constructed by the solidified material and the precast member,
A water-permeable hole that communicates one side surface provided on the lower part of the precast member corresponding to the water-impermeable layer in the ground and the other side surface;
Said hand vertically on top of the permeable holes along one side and the other side surface of the precast member is continuously provided, and corresponding hydraulic conductivity groove and the ground of the water-permeable layer,
By cutting out the solidification material over the entire length of the water-permeable groove by pulling out the water-flowing jig fitted in the ground together with the precast member after being fitted over the entire length of the water-permeable groove. An underground continuous wall, comprising: a notch groove in which the water permeable groove communicates with the water permeable layer . The underground continuous wall according to claim 1, further comprising a water-permeable material filled in the water-permeable groove. Wall member, according to claim 1 or 2 diaphragm wall according to, characterized in that provided in the vertical form. The underground wall according to claim 1 or 2 , wherein the wall member is provided in an inclined shape. A wall member in which a water permeable hole is provided in the lower part and a water permeable groove is continuously provided in the upper part of the water permeable hole and a long and hollow water permeable jig fitted in the water permeable groove in the wall member are integrated. In the ground
By pulling out only the water passage jig against the water permeable groove of the wall member,
Fill the water permeable groove with a water permeable material preloaded in the tubular jig body of the water flow jig,
At the same time, the underground continuous wall construction method is characterized in that a notch groove is opened from the permeable groove to the dirt wall side by a groove excavation claw provided at the tip of the tubular jig body. 6. The underground continuous wall construction method according to claim 5 , wherein the wall member has a claw extruding portion that projects the groove excavation claw toward the earth wall side in conjunction with the drawing operation of the water flow jig.

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