JP2011058360A - Construction method for retaining wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for retaining wall structure, in detail, the construction method for the retaining wall structure securing the stability of a back-filling space, i.e. a space between a layered member and a sloped face, by injecting a grout liquid into a filler filled in a rear side of the retaining wall layered member. <P>SOLUTION: This construction method for the retaining wall structure is constituted to connect the layered member to a grout liquid injection pipe penetrated through a ground, to fill the filler on the rear side of the layered member, to permeate the grout liquid injected from the grout liquid injection pipe, into a peripheral ground, and to solidify the filler filled between the layered member and the ground, by the grout liquid discharged from the injection pipe. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for constructing a retaining wall structure, and more specifically, a grout solution is injected into a filler packed behind a retaining wall laminated member to provide a backfill space, that is, between the laminated member and the inclined surface. The present invention relates to a construction method of a retaining wall structure capable of ensuring the stability of a space.

  Generally, the retaining wall is a structure that resists earth pressure and supports the soil so that it does not collapse. In recent years, laminated walls such as blocks have been built up to make retaining walls, but these retaining walls can minimize the cutting of slopes compared to reinforced concrete retaining walls, etc., and can produce a beautiful front wall. In addition, since it has the advantage that it is easier and easier to manufacture than the reinforced concrete retaining wall and is easy to transport to the site, it is widely constructed.

  Retaining walls using laminated members use ground anchors, soil nailing, rock bolts, etc. to reinforce the cut slope. Construction methods using soil nailing or rock bolts can be divided into construction methods using large panels and construction methods using small blocks according to the size of laminated members, for example, precast concrete products.

  A construction method using a large panel is disclosed in Korean Patent Registration No. 1993-0000629. FIG. 1 is a cross-sectional view showing a laminated retaining wall constructed by the construction method, and FIG. 2 is a sectional view showing a stepped retaining wall constructed by the construction method.

  The construction method using a large panel includes a step of cutting a slope, a step of providing a perforated hole in the cut slope and inserting a soil nailing or a lock bolt 11 in the perforated hole, and a foundation block 12 for installing a large panel. 13, a step of connecting the soil nailing or rock bolt 11 and the large panel 13 and filling the filler 14 between the large panel 13 and the slope, and applying compressive stress to the soil nailing or rock bolt 11. Forming a block clot.

  In the construction method, after the soil nailing or the lock bolt 11 is inserted into the perforated hole, the grout liquid 1 can be injected into the perforated hole. Furthermore, the pile 15 can be suspended from the foundation block 12, and the foundation block 12 can be firmly fixed to the ground.

  In the construction method, the backfilling space between the large panel 13 and the slope is filled with the filler 14 and filled, but when the backfilling space is narrow and cannot be sufficiently solidified, the large panel 13 and the filler 14 There is a high possibility that the close contact is loosened and the large panel 13 is displaced. On the other hand, when the filler 14 is not completely solidified, when the ground pressure is applied to the soil nailing or the rock bolt 11 that penetrates the panel, the support force of the filler 14 is not sufficient, so that the large panel 13 is May move irregularly. Since the close contact between the large panel 13 and the filler 14 is not perfect, the stress concentrates on the connecting portion between the soil nail ring or the lock bolt 11 and the large panel 13 to reduce the stability. In order to overcome such a problem, when the number of soil nail rings or lock bolts 11 is increased to distribute the load applied to the connecting portion, the construction period and cost increase.

  On the other hand, a method using a small block is disclosed in Korean Patent Registration No. 10-0372821. FIG. 3 is a cross-sectional view showing a laminated retaining wall constructed by the construction method, and FIG. 4 is a sectional view showing a stepped retaining wall constructed by the construction method.

  The method using a small block is a step of cutting a slope and penetrating a soil nailing or rock bolt 21 on the slope, and connecting a reinforcing material 22 to the soil nailing or lock bolt 21 and then laminating the small blocks 23. The method includes a step of connecting the reinforcing member 22 and the small block 23 and a step of filling the filler 14 between the slope and the small block 23. The small block 23 is stacked on the base block 12. A pile 15 can be suspended from the foundation block 12 so that the foundation block 12 can be firmly fixed to the ground.

  In the above construction method, the backfilling space between the small block 23 and the slope is filled with the filler 14 and embankment, but when the backfilling space is narrow and cannot be sufficiently solidified, the small block 23 and the filler 14 There is a high possibility that the close contact is loosened and the small block 23 is displaced.

  Further, since the method uses the small block 23, the soil nailing or the lock bolt 21 and the small block 23 are not in a one-to-one correspondence, and a sufficient ground pressure cannot be applied to the small block 23. Furthermore, since the close contact between the small block 23 and the filler 14 is not perfect, the stress is concentrated on the connecting portion between the soil nailing or the lock bolt 21 and the small block 23, and the stability is reduced. In order to overcome this problem, when the number of soil nail rings or lock bolts 21 is increased to distribute the load applied to the connecting portion, the construction period and cost increase.

  A construction method using a ground anchor is disclosed in Korean Patent Registration No. 10-0525156. FIG. 5 is a cross-sectional view showing a laminated retaining wall constructed by the construction method, and FIG. 6 is a sectional view showing a stepped retaining wall constructed by the construction method.

  The construction method using the ground anchor is a construction method that stabilizes the slope by fixing the expected destruction soil on the solid ground using the ground anchor 31 and the precast concrete panel (hereinafter referred to as “PC panel”) 32.

  The method includes cutting the slope and setting the foundation concrete 33, placing the PC panel 32 upright and placing the backfill concrete 34, and drilling the backfill concrete 34 and the ground to anchor 31. And a step of filling the filler material 14 on the backfill concrete 34.

  In this method, not only the anchor panel 31 is penetrated but the PC panel 32 must be erected first and the backfill concrete 34 must be placed, and the anchor 31 must be fixed to a solid ground. The anchor 31 must be long because it does not. Therefore, because of the curing time of the backfill concrete 34 and the long anchor 31, there is a problem that a long time is required for the construction and the construction cost increases.

  Also, since the construction method requires that the PC panel 32 be first placed and the anchor 31 penetrate, the slope reinforcement is performed by the down-up (DOWN-UP) method instead of the top-down (TOP-DOWN) method. You have to leave the slopes cut temporarily for a long time. Therefore, a stability problem during construction occurs on the cut slope, and a drilling operation is performed using a large crane equipment, resulting in problems of securing work space and economy.

Korean Patent Registration No. 1993-0000629 Korean Patent Registration No. 10-0372821 Korean Patent Registration No. 10-0525156

  The present invention was devised to solve the above problems, in which a grout liquid is injected into a filler packed between a slope and a laminated member, and the grout liquid penetrates into the filler and solidifies. It aims at providing the construction method of the retaining wall structure which can raise the intensity | strength of a filler by becoming.

  Another object of the present invention is to provide a method for constructing a retaining wall structure in which an injection pipe for injecting grout liquid and a laminated member are integrated.

  Still another object of the present invention is to provide a method for constructing a retaining wall structure that can solve this problem when it is difficult to provide stability of the retaining wall because the backfill space of the retaining wall is not secured. .

  In order to achieve the above object, the retaining wall structure as a reference example according to the present invention is such that the grout liquid discharged from the grout liquid injection pipe permeates the surrounding ground, the injection pipe and the laminated member are connected, and the laminated member The filler filled between the ground and the ground is solidified by the grout liquid discharged from the injection pipe.

  Preferably, the injection pipe is provided with a grout liquid discharge hole along the length direction so that the grout liquid can be injected into the ground and the filler.

  More preferably, a packing member is provided at the entrance of the perforated hole so that the grout liquid can be sprayed onto the ground at a predetermined pressure.

  Desirably, a waterproof mat is provided on the back surface of the laminated member in order to prevent the grout liquid from leaking outside through the gap between the laminated members.

  More preferably, the injection tube is inserted into the perforation hole, and the discharge hole of the portion protruding outside the perforation hole is formed downward when it is necessary to plant a plant.

  On the other hand, the retaining wall construction method according to the present invention includes (a) a step of connecting a grout liquid injection pipe penetrating through the ground and the laminated member, and (b) a step of filling a filler behind the laminated member, c) injecting a grout solution into the injection tube to solidify the filler.

  Preferably, any one of the step (a) and the step (b) further includes a step of injecting a grout liquid into the injection tube to infiltrate the grout liquid into the ground.

  Other construction methods of the retaining wall according to the present invention include (a1) cutting the ground and laminating the laminated member, (b1) packing the filler behind the laminated member, and (c1) the laminated member. Penetrating, drilling a filler and ground and penetrating a grout solution injection tube, and (d1) injecting grout solution through the injection tube.

  Still another construction method of the retaining wall according to the present invention includes (a2) cutting the ground and laminating laminated members, and (b2) drilling a perforated hole in the ground and inserting an injection pipe into the perforated hole. And (c2) connecting the laminated member and the injection tube to pack the filler, and (d2) injecting the grout liquid into the injection tube with pressure applied.

  Still another construction method of the retaining wall according to the present invention includes (a3) a step of cutting the ground and laminating a laminated member, and (b3) a step of drilling a perforated hole in the ground and inserting an injection pipe into the perforated hole. And (c3) a step of injecting the grout liquid into the injection pipe while applying pressure in a multistage manner only to the drilled hole portion excavated in the ground, and (d3) filling the space between the laminated member and the inclined surface with a filler. And (e3) injecting a grout liquid into the injection tube to solidify the filler.

It is sectional drawing which shows the retaining wall by a prior art. It is sectional drawing which shows the retaining wall by a prior art. It is sectional drawing which shows the retaining wall by a prior art. It is sectional drawing which shows the retaining wall by a prior art. It is sectional drawing which shows the retaining wall by a prior art. It is sectional drawing which shows the retaining wall by a prior art. 3 is a flowchart illustrating a process of constructing a laminated retaining wall according to a preferred embodiment of the present invention. It is sectional drawing which shows the process of constructing | stacking a laminated type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing | stacking a laminated type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing | stacking a laminated type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing | stacking a laminated type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing | stacking a laminated type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention. It is sectional drawing which shows the process of constructing a stair-type retaining wall by the preferable Example of this invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims should not be construed as limited to general or lexical meaning, and the inventor himself will best explain the invention. In accordance with the principle that the term concept can be appropriately defined, it must be interpreted in the meaning and concept corresponding to the technical idea of the present invention. Therefore, the configuration described in the embodiments and drawings described in this specification is only the most preferable embodiment of the present invention, and does not represent all of the technical idea of the present invention. It should be understood that there are various equivalents and variations that can be substituted for these at the time of filing.

  The present invention can increase the strength of the filler by injecting the grout liquid into the filler packed between the laminated member and the slope, the laminated member and the injection tube can be integrated, The feature is that this can be solved in the case where it is difficult to provide the stability of the retaining wall because the space for retaining the retaining wall is not secured. Hereinafter, the construction method of the retaining wall will be described together with the construction method of the retaining wall. In the present specification, the term “laminated member” is defined to include a retaining wall block, a precast concrete panel, and the like that constitute the wall of the retaining wall.

  FIG. 7 is a flowchart illustrating a process of constructing a laminated retaining wall according to a preferred embodiment of the present invention, and is a cross-sectional view illustrating the construction of the laminated retaining wall.

  Referring to the drawing, the retaining wall construction method includes cutting the ground to excavate the drill hole 41 (S10), inserting the grout liquid injection pipe 42 into the drill hole 41 (S20), The step of injecting the grout solution 1 into the injection tube 42 to integrate the ground and the grout solution 1 (S30), the step of repeating steps S10 to S30 (S40), and connecting the injection tube 42 and the laminated member 43 to each other. Then, the step of filling the filler 44 behind the laminated member 43 (S50) and the step of injecting the grout liquid 1 into the injection tube 42 to integrate the filler 44 and the grout liquid 1 (S60) are included.

  First, the ground is cut and a drill hole 41 is excavated on the cut slope (S10). The ground cutting and the excavation of the perforated hole 41 are performed in the same manner as the ordinary retaining wall construction, and thus detailed description thereof is omitted here.

  After the excavation of the perforated hole 41 is completed, the grout liquid injection pipe 42 is inserted into the perforated hole 41 as shown in FIG. 8 (S20). The injection pipe 42 is provided with a grout liquid discharge hole 42a for discharging the grout liquid to the outside. Desirably, the discharge hole 42a is provided along the length direction of the injection pipe 42 so that the grout liquid can be injected into the ground and the filler 44, respectively. Further, it is desirable that the portion of the injection tube 42 protruding to the outside of the perforation hole 41 is provided with a discharge hole 42a downward, but this is performed so that the grout liquid 1 is jetted downward. This is because a plant can be planted on the upper part of 42.

  The injection tube 42 can be made of a steel tube with a constant diameter. Spacers (not shown) can be provided around the injection tube 42 at predetermined intervals so that the interval between the injection tube 42 and the perforated hole 41 can be maintained constant.

  After inserting the injection tube 42 into the perforated hole 41, as shown in FIG. 9, the grout solution 1 is injected into the injection tube 42 to integrate the ground and the grout solution 1 (S30). A packing member 45 is provided at the entrance of the perforation hole 41 so that the grout liquid 1 can be injected into the perforation hole 41 at a predetermined pressure. The packing member 45 seals the gap between the injection tube 42 and the perforated hole 41 and prevents the grout liquid 1 from leaking outside the perforated hole 41.

  Until the perforated hole 41 is filled with the grout liquid 1, the grout liquid 1 is injected into the perforated hole 41 without applying pressure, and after the perforated hole 41 is filled, the grout liquid 1 is applied with pressure applied. Injected. The pressure allows the grout liquid 1 to effectively penetrate the ground.

  Desirably, the injection of the grouting liquid 1 is performed by a pressure multi-stage grouting apparatus (not shown). The pressure multi-stage grout apparatus is an apparatus that can inject the grout liquid 1 while applying pressure to each area by dividing the injection tube 42 into a certain number of areas using a mechanical rubber packer for injection or a hydraulic packer. . Therefore, the injection packer system injects the grout liquid 1 so that pressure is applied to the injection tube 42 inserted into the perforated hole 41 with reference to the portion of the injection tube 42 corresponding to the packing member 45. The injected grout liquid 1 penetrates the ground and is integrated with the ground.

  Next, as shown in FIG. 10, the slope is reinforced by repeating the steps S10 to S30 from the upper end of the slope (S40). That is, after all of the ground cutting process, the drilling hole 41 excavation process, the process of inserting the injection pipe 42 into the drilling hole 41, and the process of injecting the grout liquid 1 into the injection pipe 42 are completed, the process is repeated by going down. . On the other hand, unlike the above method, the ground cutting process, the drilling hole 41 drilling process, and the process of inserting the injection pipe 42 into the drilling hole 41 may be performed sequentially after the preceding process is completed. it can.

  Next, as shown in FIG. 11, the injection tube 42 and the laminated member 43 are connected, and the filler 44 is packed behind the laminated member 43 (S50). A foundation block 46 is provided on the ground, and the laminated member 43 is laminated on the upper part of the foundation block 46. After the injection tube 42 is inserted into an insertion hole (not shown) provided in the laminated member 43 in advance, a screw thread that engages with a normal connection member, that is, a screw thread formed on the outer peripheral surface of the injection tube 42. They can be connected by a nut (not shown). Although normal fillers 44 such as earth and sand, aggregates and the like can be used, it is desirable that the fillers 44 be pressed and hardened by applying a load.

  Desirably, a water shielding mat (not shown) is provided on the back surface of the laminated member 43. The water shielding mat prevents the grout liquid 1 from leaking from the gaps between the laminated members 43 when the grout liquid 1 is injected into the filler 44. When the injection of the grouting liquid 1 into the filler 44 is completed, the cutting member is inserted into the gap between the laminated members 43 to cut the water shielding mat. The cutting is for discharging water in the ground and the filler 44.

  A non-woven fabric (not shown) may be provided between the slope and the filler 44.

  After filling the filler 44, as shown in FIG. 12, the grout liquid 1 is injected into the injection tube 42 to integrate the filler 44 and the grout liquid 1. The grout liquid 1 penetrates into the gaps between the fillers 44 and solidifies the fillers 44, thereby increasing the strength of the fillers 44.

  It is desirable to inject the grout liquid 1 in a state where pressure is applied. The pressure multi-stage grouting apparatus can also be used for such an operation of injecting the grouting liquid 1.

  As described above, when the discharge hole 42a of the injection tube 42 projecting to the outside of the perforation hole 41 is formed downward, the grout solution 1 is discharged downward. Planting (not shown) becomes possible.

  If the grout liquid penetrates into the gaps between the fillers 44, the fillers 44 are solidified and the strength of the fillers 44 increases. In addition, since the injection tube 42 is fixed to the laminated member 43 and a sufficient ground pressure can be applied to the laminated member 43, the supporting force of the injection tube 42 is increased and the stability can be ensured. Further, when the grout liquid 1 that has penetrated into the inside of the injection pipe 42 and the surrounding ground is cured, the rigidity of the grout liquid 1 is added to the rigidity of the injection pipe 42 itself, and the resistance force that resists the load is further increased.

  In the above description, it has been described that the grout liquid injection step (S30) into the ground and the grout liquid 1 injection step (S60) into the filler 44 are performed separately, but the two steps (S30, S60) It can also be performed as one step. That is, the step of excavating the ground by cutting the ground, the step of inserting the injection tube 42 into the drilling hole 41, and connecting the injection tube 42 and the laminated member 43 to fill the rear of the laminated member 43 After the stage of filling the material 44 is completed, it is possible to inject the grout liquid 1 into the injection pipe 42 and to infiltrate the grout liquid 1 into the filler 44 and the ground.

  It is also possible to excavate the perforated hole 41 after laminating the laminated member 43 and filling the filler 44. That is, it is possible to inject the grout liquid 1 by inserting the injection pipe 42 into the perforation hole 41 after excavating the perforation hole 41 after completing the ground cutting, laminating of the laminating member 43 and filling of the filler 44. It is. The drilling hole 41 can be excavated through the laminated member 43 or through the insertion hole of the laminated member 43.

  Further, the construction method includes a step of cutting the slope and laminating the laminated member 43, a step of excavating the perforated hole 41 and inserting the injection pipe 42 into the perforated hole 41, and connecting the laminated member 43 and the injection pipe 42. Then, the step of filling the filler 44 and the step of injecting the grout liquid 1 into the injection tube 42 in a state where pressure is applied can also be performed.

  Further, the construction method includes a step of cutting the ground and laminating the laminated member 43, a step of drilling a perforated hole 41 in the ground, and inserting an injection pipe 42 into the perforated hole 41, and a perforation excavated in the original ground. The step of injecting the grout liquid 1 into the injection tube 42 while applying pressure to the hole 41 only in a multistage manner, the step of filling the filler 44 in the space between the laminated member 43 and the inclined surface, and the injection of the grout liquid 1 into the injection tube 42 Thus, the filling material 44 may be consolidated in the order of steps.

  The construction method of the present invention can be applied to the construction of such a laminated retaining wall 100, but can also be applied to the construction of a staircase retaining wall. 13 to 22 are cross-sectional views illustrating the construction of the staircase retaining wall according to the preferred embodiment of the present invention.

  As shown in the drawings, in the construction method, the upper retaining wall 200a is completed first, and then the lower retaining wall 200b is constructed. However, the present invention is not limited to such a procedure. Details will be described later. Of the reference numerals in FIGS. 13 to 22, the same reference numerals as those in FIGS. 8 to 12 denote the same members that perform the same functions.

  The upper retaining wall 200a is constructed by cutting the ground and excavating the drill hole 41, inserting the grout liquid injection pipe 42 into the drill hole 41, and injecting the grout liquid 1 into the injection pipe 42. A step of integrating the ground and the grout liquid 1, a step of repeating the steps, a step of connecting the injection tube 42 and the laminated member 43, and filling the filler 44 behind the laminated member 43, and an injection tube 42 And injecting the grout solution 1 to integrate the filler 44 and the grout solution 1. Since each step is performed according to the same principle as each step of the laminated retaining wall 100, detailed description is omitted here.

  After the upper retaining wall 200a is completed, the lower retaining wall 200b is constructed. The lower retaining wall 200b can be constructed according to the same principle as the upper retaining wall 200a.

  In the above description, in order to construct the staircase type retaining walls 200a and 200b, it has been described that the lower retaining wall 200b is constructed after the upper retaining wall 200a is completed, but the upper retaining wall 200a and the lower retaining wall 200b. Can be constructed at the same time. That is, the ground is cut in a staircase fashion, and after drilling the perforated holes 41 on the slopes of each staircase, the injection pipe 42 is inserted into the perforated holes 41 and grouting to complete the sloped retaining walls of each staircase simultaneously. It is also possible to do.

  Further, as in the embodiment described above, the step of injecting the grout liquid 1 into the ground and the step of injecting the grout liquid 1 into the filler 44 can be performed individually, but the two steps can be performed as one process. it can. That is, the step of excavating the ground by cutting the ground, the step of inserting the injection tube 42 into the drilling hole 41, and connecting the injection tube 42 and the laminated member 43 to fill the rear of the laminated member 43 After the stage of filling the material 44 is completed, it is possible to inject the grout liquid 1 into the injection pipe 42 and to infiltrate the grout liquid 1 into the filler 44 and the ground.

  Furthermore, it is also possible to excavate the perforated hole 41 after laminating the laminated member 43 and filling the filler 44. That is, it is possible to inject the grout liquid 1 by inserting the injection pipe 42 into the perforation hole 41 after excavating the perforation hole 41 after completing the ground cutting, laminating of the laminating member 43 and filling of the filler 44. It is. The drilling hole 41 can be drilled through the laminated member 43 or through the insertion hole of the laminated member 43.

  Further, the construction method includes a step of cutting the slope and laminating the laminated member 43, a step of excavating the perforated hole 41 and inserting the injection pipe 42 into the perforated hole 41, and connecting the laminated member 43 and the injection pipe 42. Then, the step of filling the filler 44 and the step of injecting the grout solution 1 into the injection tube 42 in a state where pressure is applied can also be performed.

  As described above, if the grout liquid penetrates into the gaps between the fillers 44, the fillers 44 are solidified and the strength of the fillers 44 increases. In addition, since the injection tube 42 is fixed to the laminated member 43 and a sufficient ground pressure can be applied to the laminated member 43, the supporting force of the injection tube 42 that supports the panel is increased, and stability can be ensured. . Moreover, if the grout liquid 1 which has penetrated into the inside of the injection pipe 42 and the surrounding ground is cured, the rigidity of the grout liquid 1 is added to the rigidity of the injection pipe 42 itself, and the resistance force resisting the load is further increased.

  Furthermore, the construction method includes a step of cutting the ground and laminating the laminated member 43, a step of drilling the perforated hole 41 in the ground and inserting the injection pipe 42 into the perforated hole 41, and a perforated hole excavated in the original ground. The step of injecting the grout solution 1 into the injection tube 42 while applying pressure to only the 41 portion in a multistage manner, the step of filling the filler 44 in the space between the laminated member 43 and the inclined surface, and the injection of the grout solution 1 into the injection tube 42 It is also possible to perform the steps in the order of solidifying the filler 44.

The construction method of the retaining wall structure according to the present invention has the following effects.
First, the grout liquid discharged from the injection pipe penetrates into the ground and filler around the injection pipe to increase the strength of the ground and filler, and the laminated member and the filler are completely adhered to stabilize the retaining wall. Sex increases.
Second, if the grout liquid that has penetrated into the injection pipe and the surrounding ground is hardened, the rigidity of the injection pipe is added to the rigidity of the injection pipe, and a greater reinforcing effect is achieved.
Third, the injection tube can be fixed to the laminated member.
Fourth, since the strength of the filler is increased and the laminated member is completely adhered to the injection tube, a sufficient ground pressure can be applied to the injection tube. Therefore, the supporting force of the laminated member can be increased.
Fifth, it is possible to ensure the stability of the backfill space of the retaining wall, that is, the space between the laminated member and the inclined surface.

41 Perforated hole 42 Grout liquid injection pipe 43 Laminated member 44 Filler 45 Packing member 46 Base block 100 Retaining wall 200a Upper retaining wall 200b Lower retaining wall

Claims (5)

(A) connecting the grout liquid injection tube penetrating the ground and the laminated member;
(B) packing the filler behind the laminated member;
(C) injecting a grout solution into the injection tube to solidify the filler;
Retaining wall construction method characterized by including.   The retaining wall according to claim 1, wherein any one of the step (a) and the step (b) further includes a step of injecting a grout liquid into the injection tube to infiltrate the grout liquid into the ground. Construction method. (A1) cutting the ground and laminating the laminated members;
(B1) packing the filler behind the laminated member;
(C1) penetrating the filler and the ground through the layer member and penetrating the grout liquid injection pipe;
(D1) injecting a grout solution through the injection tube;
Retaining wall construction method characterized by including. (A2) cutting the ground and laminating laminated members;
(B2) excavating a perforated hole in the ground and inserting an injection tube into the perforated hole;
(C2) connecting the laminated member and the injection tube and filling the filler;
(D2) injecting the grout solution into the injection tube with pressure applied;
Retaining wall construction method characterized by including. (A3) cutting the ground and laminating laminated members;
(B3) drilling a perforated hole in the ground and inserting an injection tube into the perforated hole;
(C3) Injecting the grout liquid into the injection pipe while applying pressure in a multistage manner only to the drilled hole portion excavated in the ground;
(D3) packing a filler into the space between the laminated member and the slope;
(E3) injecting grout liquid into the injection tube to solidify the filler;
Retaining wall construction method characterized by including.

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