Flexible repairable connecting structure for groove sections of concrete diaphragm wall and construction method of flexible repairable connecting structure

Abstract

The invention discloses a flexible repairable connecting structure for groove sections of a concrete diaphragm wall and a construction method of the flexible repairable connecting structure, and belongs to the technical field of water conservancy and hydropower construction. The joint pipe is composed of an embedded rubber membrane, an inner supporting steel pipe and an outer supporting steel pipe, the opportunity control problem is solved through staged pipe drawing, the rubber membrane is flexibly connected to resist deformation, and a reserved grouting channel is convenient to repair. The problems that a traditional joint pipe is high in pipe drawing risk, a groove section seam is prone to leakage and grouting is difficult are solved, and the joint pipe is suitable for water and electricity hydraulic engineering diaphragm wall construction.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower and water conservancy project construction, and in particular to a flexible and repairable connection structure for a concrete anti-seepage wall groove section and a construction method. The structure is suitable for solving technical problems such as difficulty in determining the timing of pipe extraction, groove section seam deformation, and curtain grouting connection during the construction of concrete anti-seepage wall joint pipes. Background Art

[0002] The joint pipe method has the advantages of high efficiency, low cost, and reliable joint quality, and is therefore widely used in the construction of concrete anti-seepage walls. The specific implementation process of the joint pipe method is as follows: after the completion of the first-phase slot hole, joint pipes are installed at both ends, and then concrete is poured. After the concrete has initially set, the joint pipes are pulled out to form a joint hole with a certain shape, and the concrete anti-seepage wall is poured together with the second-phase slot hole. In the construction of the joint pipe method, there is the problem of difficult to control the timing of pipe pulling. If the pipe is pulled out too early, the concrete that has not reached the required strength is easily damaged by the stratum pressure and collapses, thereby affecting the anti-seepage effect of the concrete anti-seepage wall; if the pipe is pulled out too late, it may cause a casting accident. At the same time, because the joint pipe method adopts the scheme of casting the anti-seepage wall in sections, if the pipe is pulled out at an inappropriate time, the concrete at the joint may not be tightly bonded with the surrounding concrete, thus forming a slot segment seam. When the anti-seepage wall undergoes large deformation, the slot segment seam will shift, resulting in an increased risk of local leakage. In addition, the joint pipe groove section seam is the natural weak link of the anti-seepage wall. If the curtain grouting fails to form an effective overlap at the joint, it may cause breakpoints in the anti-seepage curtain and affect the effectiveness of the anti-seepage system.

[0003] To avoid problems with the construction quality of the anti-seepage wall due to the difficulty in controlling the timing of pipe pulling. The existing method (CN118961372 A) installs a concrete detection device in the joint pipe to detect the state of the concrete in real time to determine the timing of pipe pulling. However, this method can only measure the concrete state on the surface of the joint pipe. The state inside the concrete anti-seepage wall is inconsistent with the state at the joint pipe. Inappropriate pipe pulling timing will cause the performance of the concrete anti-seepage wall to be damaged, and this method does not solve the impact of the groove joint on the anti-seepage performance. The existing method (CN 117536230 A) determines the timing of pipe pulling by monitoring the pipe pulling force. Although pipe pulling can be completed with a lower pulling force, it does not take into account the relationship between the concrete state and the pulling force under complex construction conditions, does not solve the problem of the adverse effect of the groove joint dislocation on the anti-seepage system under large deformation conditions, and does not consider the impact of the joint pipe construction on the curtain grouting construction.

[0004] In summary, although the existing methods can solve the problem of difficulty in determining the timing of pipe extraction to a certain extent, they are difficult to implement, costly, and have a narrow scope of application. In addition, it is difficult to solve the problems of deformation of the slot section caused by the dislocation of the cut-off wall and the impact of the joints on the curtain grouting. Summary of the Invention

[0005] In view of this, the present invention provides a flexible and repairable connection structure of a concrete anti-seepage wall groove section and a construction method thereof. In view of the difficulty in determining the timing of pipe extraction, deformation of the groove section seam leading to defects in the anti-seepage wall, and curtain grouting construction, a flexible and repairable connection structure of a concrete anti-seepage wall groove section and a joint pipe construction method are proposed. During the construction of the anti-seepage wall, the joint pipe can be pulled out after the concrete anti-seepage wall is completely solidified, avoiding the problem of needing to accurately control the timing of pipe extraction, and solving the problem of difficulty in controlling the timing of pipe extraction in the current anti-seepage wall construction.

[0006] One of the present inventions is achieved through the following technical solutions:

[0007] A flexible and repairable connection structure for a concrete anti-seepage wall groove section, comprising:

[0008] Embedded rubber membrane: a semicircular tubular structure with rectangular protrusions distributed along the circumference on both the inner and outer surfaces, and a cylindrical grouting reserved channel passing through the center of each rectangular protrusion;

[0009] The inner supporting steel pipe is a semicircular tubular structure, the outer surface of which matches the shape of the inner surface of the embedded rubber membrane, and the inner wall is provided with rectangular pipe drawing grooves arranged at equal distances;

[0010] The outer supporting steel pipe is a semicircular tubular structure, the inner surface of which is detachably connected to the outer surface of the inner supporting steel pipe through a chimeric structure, and the outer wall is provided with rectangular pipe drawing grooves arranged at equal distances;

[0011] The embedded rubber membrane is located between the inner supporting steel pipe and the outer supporting steel pipe, and the three are combined to form a complete cylindrical joint pipe structure.

[0012] Furthermore, the rectangular protrusions are arranged at equal angles with the center of the joint pipe as the center, and a single rectangular protrusion protrudes radially inward and outward by 25-50 mm respectively, and the radius of the cylindrical grouting reserved channel is 30-80 mm.

[0013] Furthermore, the interlocking structure between the inner supporting steel pipe and the outer supporting steel pipe is any one of a T-shaped slot, a tenon-groove structure or a bolt connection structure.

[0014] Furthermore, the contact surface between the embedded rubber membrane and the inner supporting steel pipe is provided with an anti-slip adhesive layer, which forms an adhesive force during the concrete pouring stage and can be broken by vertical pulling force during the pipe pulling stage.

[0015] The second aspect of the present invention is achieved through the following technical solutions:

[0016] A construction method using the above-mentioned connection structure comprises the following steps:

[0017] S1. Phase I Trough Construction:

[0018] After the first-stage slot hole drilling and hole cleaning are completed, the joint pipe is vertically lowered into the hole so that the outer side of the embedded rubber membrane is facing away from the direction of the second-stage anti-seepage wall;

[0019] Pour the first phase of concrete to the designed elevation at one time. After the first phase of concrete reaches the designed strength, use a pipe pulling machine to pull out the outer support steel pipes in sections, leaving the inner support steel pipes.

[0020] S2. Phase II trench section construction:

[0021] Excavate the second phase trench section stratum, and remove the inner supporting steel pipe after the first phase concrete strength meets the pipe removal requirements;

[0022] pouring the second phase concrete to form a flexible connection between the first phase and the second phase concrete on both sides of the embedded rubber membrane;

[0023] S3. Curtain grouting repair:

[0024] The grouting material is injected through the cylindrical grouting reserved channel to fill and repair the defective area of the cut-off wall.

[0025] Furthermore, the timing for pulling out the outer supporting steel pipe in step S1 is: when the compressive strength of the first-stage concrete reaches 2-5 MPa, vertical tension is applied through the rectangular pulling-out groove on the outer wall of the outer supporting steel pipe.

[0026] Furthermore, the removal of the inner supporting steel pipe in step S2 needs to be completed 2-4 hours before the second phase trough section concrete pouring, and during the removal, a rotational pulling force is applied through the rectangular pipe removal groove on the inner wall of the inner supporting steel pipe.

[0027] Furthermore, the grouting material in step S3 is cement slurry, cement clay slurry or chemical slurry, and the grouting pressure is monitored in real time during the grouting process, and the pressure control range is 0.3-1.5 MPa.

[0028] Furthermore, after the pouring of the first and second phase concrete is completed, the anti-seepage wall needs to be sprinkled with water or covered with a film for curing, and the curing time is not less than 7 days.

[0029] The beneficial effects of the present invention are:

[0030] 1. Simplified timing of pipe extraction: No need to rely on the initial setting time of concrete, pipes can be extracted after complete solidification, avoiding collapse and pipe casting risks;

[0031] 2. Flexible and anti-deformation: The rubber membrane connection structure absorbs deformation and reduces leakage caused by the misalignment of the slot segments;

[0032] 3. Repairability: Reserved grouting channels facilitate later curtain grouting and improve the durability of the anti-seepage system;

[0033] 4. Convenient construction: Pulling out the pipes in stages reduces disturbance, and the process is simple and low-cost.

[0034] In summary, the present invention creatively proposes a combined structure including an embedded rubber membrane, an inner supporting steel pipe, and an outer supporting steel pipe and a construction method thereof, which effectively solves the problem of difficulty in determining the timing of pulling out the joint pipe, avoids the risk of slot segment dislocation caused by large deformation of the anti-seepage wall, and facilitates the subsequent curtain grouting construction, thereby improving the construction quality and anti-seepage performance of the concrete anti-seepage wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the structures of the present invention after being spread out;

[0037] Figure 3 Schematic diagram of the structure of the embedded rubber membrane;

[0038] Figure 4 is a top view of the embedded rubber membrane;

[0039] Figure 5 Schematic diagram of the structure of the inner supporting steel pipe;

[0040] Figure 6 This is a top view of the inner supporting steel pipe;

[0041] Figure 7 This is a side view of the inner supporting steel pipe;

[0042] Figure 8 Schematic diagram of the structure of the outer supporting steel pipe;

[0043] Figure 9 It is the side view of the outer supporting steel pipe;

[0044] Figure 10 This is a top view of the outer supporting steel pipe;

[0045] Figure 11 Schematic diagram of the combination of the inner supporting steel pipe and the outer supporting steel pipe;

[0046] Figure 12 Schematic diagram of the combination of the embedded rubber membrane, the inner supporting steel pipe and the outer supporting steel pipe;

[0047] Figure 13 It is a construction schematic diagram of the present invention.

[0048] Description of reference numerals:

[0049] 1-Rectangular protrusion; 2-Embedded rubber membrane; 3-Inner supporting steel pipe; 4-Outer supporting steel pipe; 5-Reserved grouting channel; 6-Rectangular pipe extraction groove; 7-First phase pouring area; 8-Second phase pouring area; 9-T-type plug; 10-T-type slot; 11-Rectangular matching groove. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0053] In the above description of the present invention, it should be noted that the terms "one side," "the other side," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0054] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0055] Please refer to the following Figure 1-13The present invention proposes a flexible, repairable connection structure joint pipe, which is divided into three parts. The first part is a semi-circular embedded rubber membrane 2 with a rectangular protrusion 1. The second part is a semi-circular inner supporting steel pipe 3 that fits the semi-circular arc of the rubber membrane. The third part is a semi-circular outer supporting steel pipe 4 that is detachably connected to the second supporting steel pipe. The specific function and structure of each part are described as follows:

[0056] ①Embedded rubber membrane: After the concrete anti-seepage wall is poured, the embedded rubber membrane remains inside the anti-seepage wall as part of the wall. The rubber membrane has a semicircular shape with rectangular protrusions. In the center of each rectangular protrusion, a cylindrical hollow pipe for later curtain grouting is reserved, that is, a reserved grouting channel 5. The embedded rubber membrane is made of high-performance waterproof material to ensure that it can maintain good anti-seepage performance while remaining inside the anti-seepage wall. In order to ensure the smooth removal of the second part of the inner supporting steel pipe, the contact surface between the embedded rubber membrane and the inner supporting steel pipe has been specially treated to ensure that no displacement occurs between the embedded rubber membrane and the inner supporting steel pipe during the pouring of the concrete anti-seepage wall. After the concrete anti-seepage wall is poured and the upper pipe pulling machine is used, the embedded rubber membrane and the inner supporting steel pipe can easily undergo vertical displacement, thereby smoothly pulling out the supporting steel pipe.

[0057] ② Support Steel Tube: The support steel tube consists of two parts. One part, called the inner support steel tube, fits tightly against the embedded rubber membrane. The other part, called the outer support steel tube, is connected to the inner support steel tube via a chimeric structure at the joint. Equally spaced rectangular tube-pulling grooves 6 are located on the inner and outer walls of the inner support steel tube to facilitate tube extraction using the tube pulling machine. Furthermore, a rectangular mating groove 11 is provided on the outer wall of the inner support steel tube, which fits into the rectangular protrusion, ensuring a secure connection between the two.

[0058] The interlocking structure of this embodiment is any one of a T-shaped slot, a tenon-groove structure or a bolt connection structure.

[0059] ③ Construction process. The pouring area of the concrete cut-off wall is divided into the first-phase pouring area 7 and the second-phase pouring area 8. First, the construction of the first-phase concrete cut-off wall is carried out. After the construction preparation, hole making, and emptying are completed, the processed joint pipe is lowered into the hole according to the design. The side with the embedded rubber membrane should face away from the direction of the second-phase cut-off wall. At the same time, the joint pipe is kept vertical and centered and lowered to the specified depth. Concrete is poured in the first-phase pouring area from the bottom to the specified position in one go. The joint pipe does not need to be pulled out during the entire pouring process. After the concrete has formed strength, the outer supporting steel pipe is pulled out first, and the inner steel pipe is temporarily left in the cut-off wall. At this time, the second-phase cut-off wall stratum is excavated. The inner supporting steel pipe left inside the cut-off wall not only helps to fix the already poured first-phase cut-off wall, but also reduces the disturbance to the first-phase cut-off wall during the excavation of the second-phase cut-off wall soil layer. When it is time to cast the second phase anti-seepage wall, the inner supporting steel pipe will be pulled out to cast the second phase concrete anti-seepage wall. After the second phase anti-seepage wall is cast, the anti-seepage wall groove sections are connected by embedded rubber membranes, and the embedded rubber membranes have good adhesion to the concrete, which will not have a negative impact on the overall anti-seepage performance of the anti-seepage wall.

[0060] A specific embodiment is provided below:

[0061] The flexible, repairable connection structure used in this project consists of 6-meter sections of joint pipe with an inner diameter of 600mm and an outer diameter of 800mm. The embedded rubber membrane, excluding the protrusions, is 100mm thick. The protrusions extend 25mm inward and outward from the edges of the rubber membrane. The arrangement of the protrusions can be adjusted to suit the project's specific needs. In this example, the protrusions are arranged at equal angles of 18° on the rubber membrane, centered on the center of the joint pipe. A reserved grouting pipe is located at the center of the rectangular protrusion with a radius of 50mm. The outer shape of the inner support steel pipe remains consistent with that of the embedded rubber membrane. A T-shaped connection structure was designed for this example: a T-shaped plug 9 is installed on each side of the inner support steel pipe, and a T-shaped slot 10 is installed on each side of the outer support steel pipe. The T-shaped plug inserts into the T-shaped slot to connect the inner and outer support pipes. The connection pattern of the inner and outer support pipes can be adjusted according to actual needs. A rectangular pipe extraction groove is provided on each inner and outer support pipe. The groove is 100mm long and extends 25mm into the support pipe.

[0062] The trench for the project's anti-seepage wall construction was divided into 7-meter sections. During the first phase of construction, the site was leveled, a guide trench was laid, and a drilling rig was installed. After surveying and setting out, the holes were drilled. Mud was injected into the holes to protect the walls, carry away slag, and cool the drill bit. Once the holes were drilled and cleaned to meet the requirements, a flexible, repairable connecting pipe was inserted vertically and centered, and concrete was poured continuously. After the first phase of concrete pouring was completed, the outer support pipes were removed in sections, while the inner support pipes remained. Excavation of the soil layer for the second phase of the anti-seepage wall was carried out. Once the first phase of concrete had reached full strength, the inner support pipes were removed, and concrete was poured again. Finally, watering or covering with film was performed for at least seven days of curing.

[0063] If defects are found in the anti-seepage system after the construction of the concrete anti-seepage wall, or if geological changes occur during the operation of the project, curtain grouting can be carried out through the grouting channel reserved in the embedded rubber membrane. The grouting process is as follows: First, make construction preparations, check whether the reserved channel is unobstructed, and clean the impurities remaining in the reserved grouting channel. According to the formation conditions and design requirements, cement slurry, cement clay slurry or chemical slurry is selected, and the slurry is injected into the formation through a grouting pump to fill pores, cracks or wall defects. During the grouting process, the pressure, flow and slurry consumption are monitored in real time to prevent slurry from flowing, leaking or lifting the formation; finally, a quality inspection is carried out, and the permeability coefficient, thickness and continuity of the curtain are tested through water pressure tests, core drilling, geophysical exploration and other methods to ensure that the design anti-seepage standards are met.

[0064] By using flexible and repairable connection structure joint pipes, the project avoids the need to precisely control the timing of joint pipe removal. Flexible joint treatment can prevent large deformation of the anti-seepage wall from causing dislocation of the joints and thus reducing the anti-seepage performance. At the same time, the embedded rubber membrane reserves grouting pipes to facilitate curtain grouting construction in the later stage.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flexible and repairable connection structure for a concrete anti-seepage wall groove section, characterized in that: include: Embedded rubber membrane: a semicircular tubular structure with rectangular protrusions distributed along the circumference on both the inner and outer surfaces, and a cylindrical grouting reserved channel passing through the center of each rectangular protrusion; The inner supporting steel pipe is a semicircular tubular structure, the outer surface of which matches the shape of the inner surface of the embedded rubber membrane, and the inner wall is provided with rectangular pipe drawing grooves arranged at equal distances; The outer supporting steel pipe is a semicircular tubular structure, the inner surface of which is detachably connected to the outer surface of the inner supporting steel pipe through a chimeric structure, and the outer wall is provided with rectangular pipe drawing grooves arranged at equal distances; The embedded rubber membrane is located between the inner supporting steel pipe and the outer supporting steel pipe, and the three are combined to form a complete cylindrical joint pipe structure.

2. The connection structure according to claim 1, characterized in that: The rectangular protrusions are arranged at equal angles with the center of the joint pipe as the center. A single rectangular protrusion protrudes radially inward and outward by 25-50 mm respectively. The radius of the cylindrical grouting reserved channel is 30-80 mm.

3. The connection structure according to claim 1, characterized in that: The interlocking structure between the inner supporting steel pipe and the outer supporting steel pipe is any one of a T-shaped slot, a tenon-groove structure or a bolt connection structure.

4. The connection structure according to claim 1, characterized in that: The contact surface between the embedded rubber membrane and the inner supporting steel pipe is provided with an anti-slip adhesive layer, which forms an adhesive force during the concrete pouring stage and can be broken by vertical pulling force during the pipe pulling stage.

5. A construction method based on the connection structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Phase I Trough Construction: After the first-stage slot hole drilling and hole cleaning are completed, the joint pipe is vertically lowered into the hole so that the outer side of the embedded rubber membrane is facing away from the direction of the second-stage anti-seepage wall; Pour the first phase of concrete to the designed elevation at one time. After the first phase of concrete reaches the designed strength, use a pipe pulling machine to pull out the outer support steel pipes in sections, leaving the inner support steel pipes. S2. Phase II trench section construction: Excavate the second phase trench section stratum, and remove the inner supporting steel pipe after the first phase concrete strength meets the pipe removal requirements; pouring the second phase concrete to form a flexible connection between the first phase and the second phase concrete on both sides of the embedded rubber membrane; S3. Curtain grouting repair: The grouting material is injected through the cylindrical grouting reserved channel to fill and repair the defective area of the cut-off wall.

6. The construction method according to claim 5, characterized in that: The timing for pulling out the outer supporting steel pipe in step S1 is: when the compressive strength of the first-stage concrete reaches 2-5 MPa, vertical tension is applied through the rectangular pulling-out groove on the outer wall of the outer supporting steel pipe.

7. The construction method according to claim 5, characterized in that: The removal of the inner supporting steel pipe in step S2 needs to be completed 2-4 hours before the second phase trough section concrete pouring. During the removal, a rotational pulling force is applied through the rectangular pipe removal groove on the inner wall of the inner supporting steel pipe.

8. The construction method according to claim 5, characterized in that: The grouting material in step S3 is cement slurry, cement clay slurry or chemical slurry. The grouting pressure is monitored in real time during the grouting process, and the pressure control range is 0.3-1.5 MPa.

9. The construction method according to claim 5, characterized in that: After the pouring of the first and second phase concrete is completed, the anti-seepage wall needs to be sprinkled with water or covered with a film for curing, and the curing time is not less than 7 days.

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