Novel rectangular sleeve structure fabricated diaphragm wall horizontal joint and construction method

Abstract

The invention relates to a novel rectangular sleeve structure assembly type diaphragm wall horizontal joint and a construction method. The novel rectangular sleeve structure assembly type diaphragm wall horizontal joint comprises a sleeve, a clamping groove, a convex rectangular body and an embedded part. The connecting structure has the beneficial effects that the upper and lower diaphragm wall components are reliably connected, multiple mechanical occlusion is formed through concave-convex matching of the rectangles and the sleeves, the connecting strength of the upper and lower sections of diaphragm walls is greatly improved, and the overall stability of the structure is guaranteed; meanwhile, the upper and lower diaphragm wall components are good in impermeability, the seepage path of water is effectively blocked through the concave-convex matched joint form, and the impermeability of the underground diaphragm wall is improved; the underground diaphragm wall prefabricated assembly type structure is convenient to construct, factory prefabrication and on-site assembly of the assembly type structure are achieved, the construction process is simplified, the construction efficiency is improved, and the construction cost is reduced; the fabricated structure is regular in shape and wide in applicability, the specifications of the convex rectangular bodies, the sleeves and the embedded parts can be adjusted according to the size and load requirements of different underground diaphragm walls, and the fabricated structure is suitable for various underground engineering scenes.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering construction technology, and in particular relates to a novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint and its construction method. Background Technology

[0002] Diaphragm walls are commonly used support and load-bearing structures in underground engineering. In the construction of prefabricated diaphragm walls, the quality of the horizontal connection between upper and lower sections directly affects the overall stability, impermeability, and load-bearing capacity of the structure. Traditional horizontal connection methods suffer from problems such as complex construction, insufficient connection strength, and poor impermeability, making it difficult to meet the industrialized and efficient construction requirements of prefabricated diaphragm walls. Therefore, there is an urgent need for a horizontal joint connector with a reasonable structure, reliable connection, and convenient construction to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint and its construction method.

[0004] This novel rectangular sleeve-structure prefabricated horizontal joint for diaphragm walls includes: a sleeve, a groove, a convex rectangular body, and embedded parts for connecting the upper and lower diaphragm walls; the sleeve includes a first sleeve and a second sleeve, with the second sleeve connected to the middle of the bottom of the upper diaphragm wall and the first sleeve located below the second sleeve; the groove includes a sleeve groove and a concave groove, with the concave groove located at both ends of the top of the lower diaphragm wall and the sleeve groove located in the middle of the top of the lower diaphragm wall, the size and shape of the sleeve groove and the sleeve... The shapes are matched; the convex rectangular bodies are set at both ends of the bottom of the upper section of the diaphragm wall, and the size and shape of the convex rectangular bodies and the concave slots are matched; the embedded parts include front embedded parts and side embedded parts. The front embedded parts are respectively set on the side walls of the diaphragm wall on both sides of the sleeve, and the side embedded parts are respectively set on the other two opposite side walls of the diaphragm wall. The embedded parts are provided with through embedded bolt holes. The embedded bolt holes of the front embedded parts on both sides of the diaphragm wall are located on the same axis, and the embedded bolt holes of the side embedded parts on both sides of the diaphragm wall are located on the same axis.

[0005] As a preferred embodiment, the convex rectangular body is composed of I-beams and concrete columns, with the I-beams vertically positioned at both ends of the upper diaphragm wall and the concrete columns enclosing the I-beams.

[0006] Preferably, the bottom of the sleeve groove is provided with an opening that penetrates the lower section of the diaphragm wall, and the bottom of the opening is a grouting port with a valve, which is located at the bottom of the lower section of the diaphragm wall; the bottom of the first sleeve is provided with an opening that penetrates the upper section of the diaphragm wall, and the top of the opening is a vent, which is located at the top of the upper section of the diaphragm wall; the opening of the sleeve groove and the opening of the first sleeve are matched.

[0007] Preferably, the diameter of the first sleeve is smaller than the diameter of the second sleeve.

[0008] Preferably, the first and second sleeves are filled with cement-based composite waterproof material.

[0009] The construction method for this novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint includes the following steps: Step 1: Construction Preparation; Step 2, Guide Wall Construction: Excavate the foundation trench along the axis of the guide wall, tie the reinforcing bars and lap the steel formwork. After removing the formwork, clean the inner wall of the guide trench and repair the guide trench. Step 3, hoisting and docking: First, hoist the lower section of the diaphragm wall into the guide groove, then hoist the upper section of the diaphragm wall and fit it into the lower section of the diaphragm wall. Set steel pipe diagonal bracing between the diaphragm wall and the guide wall, insert the bolts into the pre-embedded bolt holes and tighten them. Step 4, Joint Treatment: Pour cement-based composite waterproof material into the sleeve. After the cement-based composite waterproof material has cured, apply sealant to the joint. Step 5: Wall fixing: Install supports around the diaphragm wall and connect them to the foundation pit support system; Step Six: Quality Monitoring and Testing: Conduct real-time monitoring of the diaphragm wall construction and verify the performance of the completed diaphragm wall.

[0010] As a preferred option, in step one, when constructing the upper diaphragm wall, several I-beams are vertically installed at both ends of the upper diaphragm wall, and then concrete columns encasing the I-beams are poured at both ends of the upper diaphragm wall to form convex rectangular bodies.

[0011] As a preferred option, in step two, after cleaning the inner wall of the guide groove, the axis and elevation of the guide wall are re-measured using a total station, and any parts exceeding the limit are repaired with cement mortar.

[0012] As a preferred option, in step three, when tightening the bolts, the bolts are symmetrically inserted into the pre-embedded bolt holes from the middle of the diaphragm wall to both sides.

[0013] Preferably, in step four, the upper and lower diaphragm walls are provided with through openings. The ends of the openings are respectively located at the top of the upper diaphragm wall, the bottom of the sleeve, the top of the sleeve groove, and the bottom of the lower diaphragm wall. The opening at the bottom of the lower diaphragm wall is a grouting port with a valve. Cement-based composite waterproof material is injected from the bottom of the lower diaphragm wall using a grouting pump. After the grout overflows from the top of the upper diaphragm wall, the valve is closed and the pressure is stabilized. The cement-based composite waterproof material is then covered and kept moist. The outer side of the joint is first rinsed clean of the floating grout and oil stains and allowed to dry. Then, sealant is applied to the joint.

[0014] The beneficial effects of this invention are: 1) The connection between the upper and lower diaphragm wall components of the present invention is reliable. Through the concave and convex fit of the rectangle and the sleeve, multiple mechanical interlocking is formed, which greatly improves the connection strength of the upper and lower diaphragm wall sections and ensures the overall stability of the structure. At the same time, the upper and lower diaphragm wall components have good seepage prevention. The concave and convex fit of the joint effectively blocks the seepage path of water and improves the seepage prevention performance of the underground continuous wall.

[0015] 2) The prefabricated diaphragm wall structure of the present invention is easy to construct. The prefabricated structure realizes factory prefabrication and on-site assembly, which simplifies the construction process, improves construction efficiency, and reduces construction costs. The prefabricated structure has a regular shape and wide applicability. The specifications of the convex rectangular body, sleeve and embedded parts can be adjusted according to the size and load requirements of different diaphragm walls, making it suitable for a variety of underground engineering scenarios.

[0016] 3) The convex rectangular I-beams of this invention serve as the core skeleton of the convex rectangular structure, effectively resisting bending deformation caused by external loads and providing the wall with a stable bending load-bearing capacity. Moreover, the cross-sectional dimensions are small yet the strength and rigidity are excellent, which can reduce the wall thickness and make the wall more suitable for foundation pit support scenarios in narrow spaces. The convex rectangular concrete core, as a key prefabricated component, is precisely filled into the gaps inside the steel structure and tightly integrated with the steel structure to form a composite structure. On the one hand, it significantly enhances the overall load-bearing capacity and bending stiffness of the wall, and further improves the bending deformation resistance by increasing the cross-sectional area and moment of inertia of the wall. On the other hand, it effectively transfers and disperses the load through the interaction with the steel, giving full play to the complementary advantages of both and jointly ensuring the excellent performance of the wall. Attached Figure Description

[0017] Figure 1 Diagram of the diaphragm wall assembly; Figure 2 Drawings of components on precast diaphragm walls; Figure 3 Drawings of prefabricated diaphragm wall components; Figure 4 This is a schematic diagram of the construction process for a convex rectangular I-beam. Figure 5 A schematic diagram of the construction process for a convex rectangular concrete column; Figure 6 This is a schematic diagram of the bolt embedded parts.

[0018] Explanation of reference numerals in the attached drawings: 1. First sleeve; 2. Second sleeve; 3. Convex rectangular body; 4. Front embedded part; 5. Side embedded part; 6. Embedded bolt hole; 7. Sleeve groove; 8. Concave groove; 9. I-beam; 10. Concrete column. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0020] Example 1 As one embodiment, a novel rectangular sleeve structure prefabricated horizontal joint for diaphragm walls is proposed, such as... Figure 1-6 As shown, it includes: a sleeve, a groove, a convex rectangular body 3, and embedded parts for connecting the upper and lower diaphragm walls; the sleeve includes a first sleeve 1 and a second sleeve 2, the second sleeve 2 being connected to the middle of the bottom of the upper diaphragm wall, and the first sleeve 1 being located below the second sleeve 2; the groove includes a sleeve groove 7 and a concave groove 8, the concave groove 8 being located at both ends of the top of the lower diaphragm wall, and the sleeve groove 7 being located at the middle of the top of the lower diaphragm wall, the size and shape of the sleeve groove 7 matching the sleeve; the convex rectangular body 3 is located at both ends of the bottom of the upper diaphragm wall, the convex rectangular body... The size and shape of the convex rectangular body 3 and the concave slot 8 are matched. The convex rectangular body 3 is composed of I-beams 9 and concrete columns 10. The I-beams 9 are vertically set at both ends of the upper diaphragm wall, and the concrete columns 10 enclose the I-beams 9. The I-beams 9, as the core skeleton of the convex rectangular body 3, can effectively resist bending deformation caused by external loads, providing the diaphragm wall with a stable bending load-bearing capacity. Moreover, the cross-sectional dimensions are small but the strength and rigidity are excellent, which can reduce the wall thickness and make the diaphragm wall more suitable for foundation pit support scenarios in narrow spaces. The concrete columns 10 of the convex rectangular body 3 are key prefabricated The components are precisely filled into the internal gaps of the I-beam 9, forming a composite structure with the I-beam 9. On the one hand, this significantly enhances the overall load-bearing capacity and bending stiffness of the diaphragm wall by increasing the cross-sectional area and moment of inertia, further improving its resistance to bending deformation. On the other hand, the interaction between the components and the I-beam 9 effectively transfers and distributes loads, fully leveraging the complementary advantages of both components to jointly ensure the superior performance of the diaphragm wall. The embedded parts include front embedded parts 4 and side embedded parts 5. The front embedded parts 4 are respectively located on both sides of the diaphragm wall of the sleeve. The side wall and the side embedded parts 5 are respectively set on the other two opposite side walls of the diaphragm wall. The embedded parts are provided with through embedded bolt holes 6. The embedded bolt holes 6 of the front embedded parts 4 on both sides of the diaphragm wall are located on the same axis. The embedded bolt holes 6 of the side embedded parts 5 on both sides of the diaphragm wall are located on the same axis, so that the bolts can pass through the diaphragm wall and be tightened. After the upper section of the diaphragm wall and the lower section of the diaphragm wall are inserted into place, the sleeve, the groove and the convex rectangular body 3 are tightened to the upper section of the diaphragm wall and the lower section of the diaphragm wall by passing the bolts through the embedded bolt holes 6, which further enhances the reliability of the connection.

[0021] like Figure 1 and Figure 2As shown, the bottom of the sleeve groove 7 has an opening that penetrates the lower section of the diaphragm wall, and the bottom of the opening is a grouting port with a valve, located at the bottom of the lower section of the diaphragm wall; the bottom of the first sleeve 1 has an opening that penetrates the upper section of the diaphragm wall, and the top of the opening is an exhaust port, located at the top of the upper section of the diaphragm wall; the opening of the sleeve groove 7 and the opening of the first sleeve 1 are matched to inject cement-based composite waterproof material into the sleeve through the opening; the first sleeve 1 or the second sleeve 2 is filled with cement-based composite waterproof material to enhance the connection sealing and structural integrity; the cement-based composite waterproof material is mixed with polyethylene fiber and carbon fiber, and has good initial properties and... The impermeability is significantly improved, enhancing the compressive strength of cement-based materials. The addition of polyethylene fiber also improves the impermeability of the material; when 2% polyethylene fiber is added, the impermeability of the material increases by 13.78%. The raw materials of the cement-based composite waterproof material are P.O42.5 ordinary Portland cement, grade I fly ash, quartz sand, 40% polycarboxylate high-performance water-reducing agent, short-cut carbon fiber, and ultra-high molecular weight polyethylene short fiber. The diameter of the first sleeve 1 is smaller than that of the second sleeve 2, forming a stepped structure between the first sleeve 1 and the second sleeve 2, enhancing the stability between the upper and lower sections of the diaphragm wall.

[0022] Example 2 As another embodiment, this second embodiment, based on the first embodiment, proposes a construction method for a novel rectangular sleeve structure prefabricated horizontal joint for diaphragm walls, such as... Figure 1-6 As shown, it includes the following steps: Step 1: Construction Preparation: Develop a construction plan and construct the diaphragm wall. Specifically, before construction, refine the drawings based on the geological survey report and design drawings, clarifying the wall segment dimensions, joint structure, and assembly accuracy. Prepare a specific plan, determining the hoisting sequence from the corners to the center, the transportation route, and emergency measures. Instruct the workers on joint connection and bolt tightening. Use a total station and level to establish an elevation control network and mark the guide wall axis and wall segment positioning lines. More specifically, such as... Figure 4 and Figure 5 As shown, when constructing the upper section of the diaphragm wall, several I-beams 9 are vertically installed at both ends of the upper section of the diaphragm wall. Then, concrete columns 10 are poured at both ends of the upper section of the diaphragm wall to enclose the I-beams 9, forming a convex rectangular body 3. More specifically, when constructing the diaphragm wall, concave grooves 8 are set in both the upper and lower sections of the diaphragm wall. When constructing the upper section of the diaphragm wall, several I-beams 9 are vertically installed in the concave grooves 8 of the upper section of the diaphragm wall. The ends of the I-beams 9 extend out of the concave grooves 8. Then, concrete columns 10 are poured in the concave grooves 8, so that the concrete columns 10 enclose the I-beams 9, and the shape and size of the convex rectangular body 3 are adapted to the concave grooves 8. The front embedded parts 4 are respectively set on the side walls of the diaphragm wall on both sides of the sleeve and the concave grooves 8. Step 2, Guide Wall Construction: Excavate the foundation trench along the guide wall axis, tie the reinforcing bars and overlap the steel formwork. After demolding, clean the inner wall of the guide trench and repair the guide trench. Specifically, first excavate the foundation trench along the guide wall axis, then manually repair the wall and drive steel sheet piles for protection depending on the soft soil conditions. Next, tie the reinforcing bars, overlap and weld the waterproof membrane steel formwork, clean the inner wall of the guide trench after demolding, and re-measure the guide wall axis and elevation with a total station. If the elevation exceeds the limit, repair it with cement mortar to ensure the rigidity and accuracy of the "guide track". Step 3, hoisting and docking: First, hoist the lower section of the diaphragm wall into the guide groove, then hoist the upper section of the diaphragm wall and fit it into the lower section of the diaphragm wall. Set steel pipe diagonal bracing between the diaphragm wall and the guide wall, and insert the bolts into the pre-embedded bolt holes 6 and tighten them. Step 4, Joint Treatment: Pour cement-based composite waterproof material into the sleeve. After the cement-based composite waterproof material has cured, apply sealant to the joint. Step 5: Wall fixing: Install supports around the diaphragm wall and connect them to the foundation pit support system; Step Six: Quality Monitoring and Testing: Conduct real-time monitoring of the diaphragm wall construction and verify the performance of the completed diaphragm wall.

[0023] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0024] Example 3 As another embodiment, this third embodiment, based on the second embodiment, proposes a more specific construction method for a novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint, such as... Figure 1-6 As shown, it includes the following steps: Step 1: Construction Preparation: Develop a construction plan and construct diaphragm walls; Step 2, Guide Wall Construction: Excavate the foundation trench along the axis of the guide wall, tie the reinforcing bars and lap the steel formwork. After removing the formwork, clean the inner wall of the guide trench and repair the guide trench. Step 3, hoisting and connection: First, hoist the lower section of the diaphragm wall into the guide groove, then hoist the upper section of the diaphragm wall and fit it onto the lower section. Install steel pipe diagonal braces between the diaphragm wall and the guide wall, and insert bolts into the pre-embedded bolt holes 6 and tighten them; specifically, as follows... Figure 1-3As shown, the installation is carried out according to the principle of "lower section first, then upper section, and segmented assembly," with a focus on controlling the hoisting accuracy and the quality of joint fitting. When hoisting the lower section of the diaphragm wall, the lifting gear is first securely attached to the four symmetrical lifting lugs at the top of the lower section. The crawler crane is slowly raised to the ground and then stopped. The lifting gear is checked and adjusted for verticality, and the total station monitors the verticality. Then, it is steadily lowered into the groove along the guide wall positioning line to ensure accurate positioning without displacement. The upper section of the diaphragm wall is hoisted in the same manner, with a laser positioning device providing real-time guidance to ensure that the first sleeve 1, the second sleeve 2, and the convex rectangular body 3 are precisely aligned with the corresponding slots of the lower section of the diaphragm wall. After slow placement and fitting, and complete fitting of the concave and convex parts, steel pipe diagonal braces are added to both sides of the diaphragm wall to tighten the guide wall, completing temporary fixation. Then, the bolt tightening and grouting processes begin. The bolts are high-strength bolts. When tightening the bolts, they are symmetrically inserted from the middle to both sides into the pre-embedded holes on the front and sides of the upper and lower sections of the diaphragm wall. A torque wrench is used to pre-tighten them to 200 mm. N·m, then finally tighten to 400 N·m, and recheck 2-3 exposed threads. If insufficient or over-tightened, readjust to ensure that the joint is evenly stressed. Step 4, Joint Treatment: Inject cement-based composite waterproof material into the sleeve. After the cement-based composite waterproof material has cured, apply sealant to the joint. Specifically, the upper and lower sections of the diaphragm wall are provided with through openings. The ends of the openings are respectively located at the top of the upper section of the diaphragm wall, the bottom of the sleeve, the top of the sleeve groove 7, and the bottom of the lower section of the diaphragm wall. The opening at the bottom of the lower section of the diaphragm wall is a grouting port with a valve. To ensure seepage prevention and structural integrity, a dual treatment of filling and sealing is employed. Before grouting with cement-based composite waterproof material mixed with polyethylene fiber and carbon fiber, debris inside the sleeve is cleaned. A grouting port with a valve is installed at the top and an air vent is installed at the bottom. Grouting is pumped from the bottom. After grout overflows at the top, the valve is closed and the pressure is stabilized at 0.2-0.3 MPa for 3 minutes. Subsequently, the sleeve is covered and kept moist for ≥7 days. During this period, collisions are strictly prohibited to ensure that the sleeve is dense and has high strength. The joint is the joint between the upper and lower sections of the diaphragm wall. The outside of the joint is first rinsed with high pressure to remove laitance and oil stains and then dried. Sealant is then applied to the gap on the outside of the joint. The sealant is a water-swellable sealant with a width ≥50mm and a thickness ≥10mm. The sealant must be applied continuously without any breaks. After application, it is pressed firmly to ensure a tight bond with the concrete surface and to form an outer water-stop ring. Step 5, Wall Fixing: Set up supports around the diaphragm wall and connect it to the foundation pit support system; specifically, after the diaphragm wall is assembled, it needs to be connected to the foundation pit support system to form an integral load-bearing structure. After the diaphragm wall is assembled, use supports to fix the assembled diaphragm wall, so that the diaphragm wall and the foundation pit support system form an integral whole and limit displacement. Step Six: Quality Monitoring and Testing: Real-time monitoring of the diaphragm wall construction and performance verification of the completed diaphragm wall; specifically, a risk control plan should be formulated before construction, and sufficient emergency supplies and equipment should be prepared on site. Throughout the construction process, the surrounding environment and the foundation pit support system should be monitored. Monitoring items should include the following: horizontal displacement of the wall, wall tilt, ground settlement, wall stress, support axial force, deep soil displacement, water level changes, and other monitoring contents required by the design; the monitoring frequency should be determined according to the excavation progress, geological conditions, surrounding environment, and changes in monitoring data, and continuous monitoring should be maintained. In special geological conditions or important construction stages, the monitoring frequency should be appropriately increased; after the wall is completed, cracks and missing corners should be visually inspected and re-measured with a tape measure and total station; a horizontal thrust load test should be conducted on site or the strength of concrete and grouting material test blocks under the same conditions should be re-tested to confirm that the shear resistance, bending resistance, and strength indicators meet the standards, and acceptance is completed.

[0025] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 2 can be referred to each other, and will not be repeated in this application.

[0026] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A novel rectangular sleeve structure prefabricated horizontal joint for diaphragm walls, characterized in that, include: Sleeves, slots, convex rectangular bodies, and embedded parts are used for connecting the upper and lower sections of the diaphragm wall. The sleeves include a first sleeve and a second sleeve, with the second sleeve connected to the middle of the bottom of the upper diaphragm wall and the first sleeve located below the second sleeve. The slots include sleeve slots and concave slots, with the concave slots located at both ends of the top of the lower diaphragm wall and the sleeve slots located at the middle of the top of the lower diaphragm wall. The size and shape of the sleeve slots and sleeves are matched. The convex rectangular bodies are located at both ends of the bottom of the upper diaphragm wall, with the size and shape of the convex rectangular bodies matched with the concave slots. The embedded parts include front embedded parts and side embedded parts. The front embedded parts are respectively located on the side walls of the diaphragm wall on both sides of the sleeve, and the side embedded parts are respectively located on the other two opposite side walls of the diaphragm wall. The embedded parts have through embedded bolt holes. The embedded bolt holes of the front embedded parts on both sides of the diaphragm wall are located on the same axis, and the embedded bolt holes of the side embedded parts on both sides of the diaphragm wall are located on the same axis.

2. The novel rectangular sleeve structure prefabricated horizontal joint for diaphragm wall as described in claim 1, characterized in that, The convex rectangular body is composed of I-beams and concrete columns. The I-beams are vertically installed at both ends of the upper diaphragm wall, and the concrete columns enclose the I-beams.

3. The novel rectangular sleeve structure prefabricated horizontal joint for diaphragm wall as described in claim 1, characterized in that, The bottom of the sleeve slot is provided with an opening that penetrates the lower section of the diaphragm wall. The bottom of the opening is a grouting port with a valve, which is located at the bottom of the lower section of the diaphragm wall. The bottom of the first sleeve is provided with an opening that penetrates the upper section of the diaphragm wall. The top of the opening is a vent, which is located at the top of the upper section of the diaphragm wall. The opening of the sleeve slot and the opening of the first sleeve are matched.

4. The novel rectangular sleeve structure prefabricated horizontal joint for diaphragm wall as described in claim 1, characterized in that, The diameter of the first sleeve is smaller than the diameter of the second sleeve.

5. The novel rectangular sleeve structure prefabricated horizontal joint for diaphragm wall as described in claim 1, characterized in that, The first and second sleeves are filled with cement-based composite waterproof material.

6. A construction method for a novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Construction Preparation: Develop a construction plan and construct diaphragm walls; Step 2, Guide Wall Construction: Excavate the foundation trench along the axis of the guide wall, tie the reinforcing bars and lap the steel formwork. After removing the formwork, clean the inner wall of the guide trench and repair the guide trench. Step 3, hoisting and docking: First, hoist the lower section of the diaphragm wall into the guide groove, then hoist the upper section of the diaphragm wall and fit it into the lower section of the diaphragm wall. Set steel pipe diagonal bracing between the diaphragm wall and the guide wall, insert the bolts into the pre-embedded bolt holes and tighten them. Step 4, Joint Treatment: Pour cement-based composite waterproof material into the sleeve. After the cement-based composite waterproof material has cured, apply sealant to the joint. Step 5: Wall fixing: Install supports around the diaphragm wall and connect them to the foundation pit support system; Step Six: Quality Monitoring and Testing: Conduct real-time monitoring of the diaphragm wall construction and verify the performance of the completed diaphragm wall.

7. The construction method of the novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint according to claim 6, characterized in that, In step one, when constructing the upper section of the diaphragm wall, several I-beams are vertically installed at both ends of the upper section of the diaphragm wall. Then, concrete columns encasing the I-beams are poured at both ends of the upper section of the diaphragm wall to form convex rectangular bodies.

8. The construction method of the novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint according to claim 6, characterized in that, In step two, after cleaning the inner wall of the guide groove, the axis and elevation of the guide wall are re-measured using a total station, and any parts exceeding the limit are repaired with cement mortar.

9. The construction method of the novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint according to claim 6, characterized in that, In step three, when tightening the bolts, insert the bolts symmetrically into the pre-embedded bolt holes from the middle of the diaphragm wall to both sides.

10. The construction method of the novel rectangular sleeve structure prefabricated diaphragm wall horizontal joint according to claim 6, characterized in that, In step four, the upper and lower diaphragm walls are provided with through openings. The ends of the openings are respectively located at the top of the upper diaphragm wall, the bottom of the sleeve, the top of the sleeve groove, and the bottom of the lower diaphragm wall. The opening at the bottom of the lower diaphragm wall is a grouting port with a valve. Cement-based composite waterproof material is injected from the bottom of the lower diaphragm wall using a grouting pump. After the grout overflows from the top of the upper diaphragm wall, the valve is closed and the pressure is stabilized. The cement-based composite waterproof material is then covered and kept moist and cured. The outer side of the joint is first rinsed clean of the floating grout and oil stains and allowed to dry. Then, sealant is applied to the joint.

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