Method for grouting slurry in gap between assembled diaphragm wall and trough wall

Abstract

The invention discloses a grouting method for gaps of a groove wall of an assembly type diaphragm wall. The grouting method comprises the following steps that a first wall bottom grouting pipe and a second wall bottom grouting pipe are reserved in a wall body unit of the diaphragm wall; a plurality of wall side grouting pipes are tightly attached to the two sides of the underground diaphragm wall body units; an underground diaphragm wall body unit is assembled, and wall bottom grouting of the underground diaphragm wall body unit is carried out; grouting the groove walls of the wall body units of the upper underground diaphragm wall; grouting film bags are placed, and symmetrical groove wall grouting is conducted; and grouting of the inter-width grooves and the C / T joints is carried out. The waterproof performance and durability are improved, the direct influence of bad water and soil environments on the fabricated underground diaphragm wall is prevented, and the service life of an underground structure is prolonged. The structural stability is enhanced, the gap of the groove wall is filled, so that the fabricated underground diaphragm wall and surrounding soil can be more effectively combined, the overall stability and bearing capacity of the structure are improved, and the structural problems caused by loosening or uneven settlement of the soil are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground structure engineering, and particularly relates to a method for grouting the voids between the groove walls of a prefabricated diaphragm wall. Background Art

[0002] There are some problems in the construction of traditional cast-in-situ diaphragm walls, such as long construction period, complex on-site operation environment, and difficult quality control. As a new type of underground structure form, prefabricated diaphragm walls are gradually applied in engineering construction. However, during the construction of prefabricated diaphragm walls, there will inevitably be voids between the groove walls.

[0003] The existence of voids in the groove walls will become a channel for groundwater seepage, affecting the waterproof performance of the underground structure, and may lead to leakage phenomena, posing a serious threat to the service safety and durability of underground projects. In addition, the voids in the groove walls will also weaken the overall structural strength and stability of the diaphragm wall. Under the action of earth pressure, water pressure, etc., it may cause wall deformation and displacement, affecting the safety of surrounding buildings and underground pipelines. Therefore, the grouting process for the voids between the groove walls of prefabricated diaphragm walls needs to be supplemented urgently. Summary of the Invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a method for grouting the voids between the groove walls of a prefabricated diaphragm wall.

[0005] The technical solution of the present invention is: a method for grouting the voids between the groove walls of a prefabricated diaphragm wall, including the following steps: A. Reserve a first bottom grouting pipe and a second bottom grouting pipe in the underground diaphragm wall wall unit; B. Arrange multiple side grouting pipes closely on both sides of the underground diaphragm wall wall unit; C. Assemble the underground diaphragm wall wall unit and perform bottom grouting for this panel of the underground diaphragm wall wall unit; D. Perform groove wall grouting for the upper panel of the underground diaphragm wall wall unit; E. Place a grouting membrane bag and perform symmetric groove wall grouting; F. Perform grouting for the inter-panel groove and the C / T joint.

[0006] Furthermore, in step A, reserving a first bottom grouting pipe and a second bottom grouting pipe in the underground diaphragm wall wall unit, the specific process is as follows: First, reserve a first bottom grouting pipe and a second bottom grouting pipe in the prefabricated underground diaphragm wall wall unit, and the first bottom grouting pipe and the second bottom grouting pipe reach the bottom of the underground diaphragm wall wall unit; Then, the first bottom grouting pipe and the second bottom grouting pipe are uniformly arranged along the width direction of the underground diaphragm wall.

[0007] Furthermore, the diameter of the first bottom wall grouting pipe is larger than that of the second bottom wall grouting pipe, and the second bottom wall grouting pipe is located between the first bottom wall grouting pipes.

[0008] Furthermore, in step B, a plurality of side grouting pipes are arranged on both sides of the diaphragm wall body unit, and the specific process is as follows: First, the side grouting pipes are arranged in position on both sides of the diaphragm wall body unit; Then, the middle side grouting pipes on one side of the diaphragm wall body unit are arranged in a high-low staggered manner.

[0009] Furthermore, the side grouting pipe includes end side grouting pipes at both ends, and the end side grouting pipes extend below the bottom of the foundation pit, and the remaining side grouting pipes extend above the bottom of the foundation pit.

[0010] Furthermore, in step C, the diaphragm wall body unit is assembled, and the bottom grouting of this diaphragm wall body unit is carried out, and the specific process is as follows: First, the diaphragm wall body unit is assembled; Then, the bottom grouting of this diaphragm wall body unit is carried out through the first bottom wall grouting pipe and the second bottom wall grouting pipe; Finally, after the assembled diaphragm wall sinks in place and the slurry begins to set, static pressure is applied to the diaphragm wall at the upper part of the diaphragm wall.

[0011] Furthermore, in step D, the grooved wall grouting of the upper diaphragm wall body unit is carried out, and the specific process is as follows: First, while the bottom grouting is carried out, the grooved wall grouting is carried out through the side grouting pipes; Then, before the side grouting pipes are grouted, crushed stones are backfilled in the grooved wall.

[0012] Furthermore, in step E, the grouting membrane bag is placed, and the symmetric grooved wall grouting is carried out, and the specific process is as follows: First, a membrane bag groove is arranged at the wall joint, and the grouting membrane bag is placed at the membrane bag groove; Then, the grouting membrane bag plays a role in dividing compartments, and the symmetric grooved wall grouting is carried out through the compartments of the grouting membrane bag.

[0013] Furthermore, in step F, the grouting of the inter-sheet groove and the C / T joint is carried out, and the specific process is as follows: After the grooved wall grouting of the assembled diaphragm wall body unit is completed, the inter-sheet groove of this diaphragm wall is filled with concrete and the C / T joint is grouted.

[0014] The beneficial effects of the present invention are as follows: The present invention improves the waterproof performance. The grooved wall voids and the wall-to-wall voids of the assembled diaphragm wall are sealed to prevent groundwater seepage, effectively avoiding the engineering risks caused by leakage problems.

[0015] The present invention improves durability, prevents the direct impact of poor soil and water environment on the prefabricated diaphragm wall, and prolongs the service life of the underground structure.

[0016] The present invention enhances structural stability. Filling the voids in the groove wall enables the prefabricated diaphragm wall to be more effectively combined with the surrounding soil, improves the overall structural stability and bearing capacity, and reduces structural problems caused by soil loosening or uneven settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the plan layout diagram of the grouting pipe in the present invention; Figure 2 is the elevation layout diagram of the grouting pipe in the present invention; Figure 3 is the cross-sectional layout diagram of the grouting pipe in the wall of the present invention; Figure 4 is the longitudinal-sectional layout diagram of the grouting pipe in the wall of the present invention.

[0018] In the figure: 1 grouting membrane bag, 2 bottom grouting pipe of the first wall 3 bottom grouting pipe of the second wall, 4 side grouting pipe 5 inter-panel groove, 6 membrane bag groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments: As Figures 1 to 4 shown, a method for grouting the voids in the groove wall of a prefabricated diaphragm wall includes the following steps: A. Reserve the bottom grouting pipe 2 of the first wall and the bottom grouting pipe 3 of the second wall in the underground diaphragm wall unit; B. Arrange multiple side grouting pipes 4 closely on both sides of the underground diaphragm wall unit; C. Assemble the underground diaphragm wall unit and perform bottom grouting for the underground diaphragm wall unit of this panel; D. Perform groove wall grouting for the underground diaphragm wall unit of the upper panel; E. Place the grouting membrane bag 1 and perform symmetric groove wall grouting; F. Perform grouting for the inter-panel groove 5 and the C / T joint.

[0020] In step A, the bottom grouting pipe 2 of the first wall and the bottom grouting pipe 3 of the second wall are reserved in the underground diaphragm wall unit, and the specific process is as follows: First, reserve the bottom grouting pipe 2 of the first wall and the bottom grouting pipe 3 of the second wall in the prefabricated underground diaphragm wall unit, and the bottom grouting pipe 2 of the first wall and the bottom grouting pipe 3 of the second wall reach the bottom of the underground diaphragm wall unit; Then, the first bottom wall grouting pipe 2 and the second bottom wall grouting pipe 3 are evenly arranged along the width direction of the diaphragm wall.

[0021] The diameter of the first bottom wall grouting pipe 2 is larger than that of the second bottom wall grouting pipe 3, and the second bottom wall grouting pipe 3 is located between the first bottom wall grouting pipes 2.

[0022] Specifically, the diameter of the first bottom wall grouting pipe 2 is 100 mm, and the diameter of the second bottom wall grouting pipe 3 is 50 mm.

[0023] Step B: A plurality of side wall grouting pipes 4 are arranged closely on both sides of the diaphragm wall wall unit. The specific process is as follows: First, the side grouting pipes 4 are arranged in alignment on both sides of the diaphragm wall wall unit. Then, the middle side grouting pipes 4 on one side of the diaphragm wall wall unit are arranged in a high-low staggered manner.

[0024] The side grouting pipe 4 includes end side grouting pipes at both ends. The end side grouting pipes extend below the bottom of the foundation pit, and the remaining side grouting pipes 4 extend above the bottom of the foundation pit.

[0025] Specifically, the bottom of the end side grouting pipe extends 0.5 m below the bottom of the foundation pit, and the bottom of the remaining side grouting pipes 4 extends 2 m above the bottom of the foundation pit.

[0026] Step C: Assemble the diaphragm wall wall unit and perform bottom wall grouting for this panel of the diaphragm wall wall unit. The specific process is as follows: First, assemble the diaphragm wall wall unit. Then, perform bottom wall grouting for this panel of the diaphragm wall wall unit through the first bottom wall grouting pipe 2 and the second bottom wall grouting pipe 3. Finally, after the assembled diaphragm wall sinks in place and the slurry starts to set, apply static pressure to the diaphragm wall at the upper part of the diaphragm wall.

[0027] Step D: Perform groove wall grouting for the upper panel of the diaphragm wall wall unit. The specific process is as follows: First, perform groove wall grouting through the side wall grouting pipe 4 while performing bottom wall grouting. Then, backfill the groove wall with crushed stones before grouting the side wall grouting pipe 4.

[0028] Step E: Place the grouting membrane bag 1 and perform symmetric groove wall grouting. The specific process is as follows: First, set a membrane bag groove 6 at the wall joint, and place the grouting membrane bag 1 at the membrane bag groove 6. Then, the grouting membrane bag 1 serves as a baffle, and symmetric groove wall grouting is performed through the baffle of the grouting membrane bag 1.

[0029] Step F: Perform grouting for the inter-panel groove 5 and the C / T joint. The specific process is as follows: After the wall groove grouting of the wall unit of the assembled underground continuous wall is completed, the groove 5 between the underground continuous wall sections is poured with concrete and the C / T joint grouting is performed.

[0030] Specifically, the bottom of the No. 1 wall bottom grouting pipe 2 and the No. 2 wall bottom grouting pipe 3 in step A is flush with the bottom of the underground continuous wall. A check valve is set at the bottom of the PVC grouting pipe of the No. 1 wall bottom grouting pipe 2 and the No. 2 wall bottom grouting pipe 3, and the top opening is effectively sealed during prefabrication to prevent cement slurry from entering and blocking the pipeline.

[0031] Specifically, the top of the wall side grouting pipe 4 in step B is 1m above the ground.

[0032] Specifically, in step C, the grouting material is a high-viscosity quick-setting grouting material, the viscosity of the high-viscosity quick-setting grouting material is 35, the specific gravity is 1.8, and the grouting pressure at the bottom of the wall is 0.55 MPa.

[0033] Specifically, the top and bottom of the grouting membrane bag 1 in step D are sealed with iron wire, and tendon clips are set at a vertical interval of 3m on the grouting membrane bag 1.

[0034] Specifically, in step E, the grouting pressure is 0.6-0.8 MPa. Example

[0035] Before prefabricating the wall unit of the assembled underground continuous wall, the wall bottom grouting pipes are evenly reserved in the wall along the width direction of the underground continuous wall to the bottom of the continuous wall. The diameter of the No. 1 wall bottom grouting pipe 2 on both sides is 100mm, and the diameter of the No. 2 wall bottom grouting pipe 3 is 50mm. The grouting pipes are made of PVC, and a check valve is set at the bottom. The top opening must be effectively sealed during prefabrication to prevent cement slurry from entering and blocking the pipeline.

[0036] At the same time, a full-length inter-width groove 5 and a film pocket groove 6 are reserved between the two wall units. Figure 1 As shown, the assembled underground continuous wall unit is cast and transported to the construction site.

[0037] Implement construction fencing, level the site, divert traffic, and use mud wall protection to construct underground continuous wall trenches. Set multiple wall side grouting pipes 4 close to both sides of the underground continuous wall unit, the bottom of the wall side grouting pipes 4 at both ends extends to 0.5m below the bottom of the foundation pit, and the bottom of the other wall side grouting pipes 4 extends to 2m above the bottom of the foundation pit, and the top of the wall side grouting pipe is 1m above the ground.

[0038] The grouting film bag 1 is placed at the film bag groove 6, the top and bottom of the grouting film bag 1 are sealed with wire, and tendon clips are set at a vertical interval of 3m. The grouting pipe 4 and the grouting film bag 1 on the wall side are placed on site and well protected.

[0039] Insert the diaphragm wall wall units along the diaphragm wall trench. After completing the connection of the wall units, carry out membrane bag grouting to form compartments. Backfill the trench wall with gravel, and then simultaneously grout through the bottom and side grouting pipes of the wall. The grouting material uses a high-viscosity quick-setting grouting material with a viscosity of 35 and a specific gravity of 1.8. The bottom grouting pressure of the wall is 0.55 MPa.

[0040] After the precast diaphragm wall sinks in place and the slurry begins to set, apply static pressure to the diaphragm wall at the upper part of the diaphragm wall.

[0041] After the grouting of the precast wall trench wall is completed, carry out the pouring of concrete in the inter-sheet groove and the grouting of the C / T joint, with a grouting pressure of 0.6 - 0.8 MPa, and seal the grouting pipe.

[0042] Repeat the above process until the construction of the diaphragm wall is completed.

[0043] The present invention improves the waterproof performance. Seal the voids between the trench wall and the wall of the precast diaphragm wall to prevent groundwater seepage, effectively avoiding the engineering risks caused by leakage problems.

[0044] The present invention improves the durability. Prevent the direct impact of the poor soil and water environment on the precast diaphragm wall, and extend the service life of the underground structure.

[0045] The present invention enhances the structural stability. Filling the voids in the trench wall enables the precast diaphragm wall to be more effectively combined with the surrounding soil, improving the overall structural stability and bearing capacity, and reducing the structural problems caused by soil loosening or uneven settlement.

Claims

1. A method for grouting gaps in assembled ground-connected wall grooves, characterized in that: The following steps are involved: A. A No. 1 wall bottom grouting pipe (2) and a No. 2 wall bottom grouting pipe (3) are reserved in the underground continuous wall unit; B. Multiple wall side grouting pipes (4) are arranged close to both sides of the underground continuous wall unit; C. Assemble the underground continuous wall unit and perform grouting on the bottom of the underground continuous wall unit; D. Carry out grouting of the trench wall of the upper underground continuous wall unit; E. Place the grouting film bag (1) and perform symmetrical grouting of the groove wall; F. Grout the inter-web grooves (5) and C / T joints.

2. A method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step A: A No. 1 wall bottom grouting pipe (2) and a No. 2 wall bottom grouting pipe (3) are reserved in the wall unit of the underground continuous wall. The specific process is as follows: First, a No. 1 wall bottom grouting pipe (2) and a No. 2 wall bottom grouting pipe (3) are reserved in the assembled underground continuous wall unit, and the No. 1 wall bottom grouting pipe (2) and the No. 2 wall bottom grouting pipe (3) are connected to the bottom of the underground continuous wall unit; Then, the No. 1 wall bottom grouting pipe (2) and the No. 2 wall bottom grouting pipe (3) are evenly arranged along the width direction of the underground continuous wall.

3. A method for grouting gaps in assembled ground-connected wall grooves according to claim 2, characterized in that: The diameter of the No. 1 wall bottom grouting pipe (2) is larger than that of the No. 2 wall bottom grouting pipe (3), and the No. 2 wall bottom grouting pipe (3) is located between the No. 1 wall bottom grouting pipe (2).

4. A method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step B: multiple wall side grouting pipes (4) are arranged close to both sides of the underground continuous wall unit. The specific process is as follows: First, side grouting pipes (4) are arranged on both sides of the underground continuous wall unit; Then, the grouting pipe (4) on the middle side of the wall unit of the underground continuous wall is arranged in a high-low staggered manner.

5. A method for grouting gaps in assembled ground-connected wall grooves according to claim 4, characterized in that: The side grouting pipes (4) comprise end side grouting pipes located at both ends, the end side grouting pipes extending below the bottom of the foundation pit, and the remaining side grouting pipes (4) extending above the bottom of the foundation pit.

6. The method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step C: assemble the underground continuous wall unit and perform grouting at the bottom of the underground continuous wall unit. The specific process is as follows: First, assemble the underground continuous wall units; Then, the wall bottom grouting of the wall unit of the underground continuous wall is carried out through the No. 1 wall bottom grouting pipe (2) and the No. 2 wall bottom grouting pipe (3); Finally, after the prefabricated underground continuous wall sinks into place and the slurry initially sets, static pressure is applied to the underground continuous wall at the upper part of the underground continuous wall.

7. The method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step D is to perform grouting of the groove wall of the upper underground continuous wall unit, and the specific process is as follows: Firstly, while grouting the bottom of the wall, grouting the groove wall is performed through the grouting pipe (4) on the side of the wall; Then, before grouting the wall side grouting pipe (4), gravel is backfilled on the groove wall.

8. The method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step E: Place the grouting film bag (1) and perform symmetrical grouting of the groove wall. The specific process is as follows: First, a membrane bag groove (6) is provided at the wall joint, and a grouting membrane bag (1) is placed in the membrane bag groove (6); Then, the grouting film bag (1) plays a role of dividing the compartments, and the groove wall grouting is performed symmetrically through the dividing compartments of the grouting film bag (1).

9. The method for grouting gaps in assembled ground-connected wall grooves according to claim 1, characterized in that: Step F is to perform grouting of the web groove (5) and the C / T joint. The specific process is as follows: After the wall groove grouting of the wall unit of the assembled underground continuous wall is completed, the groove (5) between the underground continuous wall sections is poured with concrete and the C / T joint grouting is performed.

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