Water stop structure with steel plate pasted after underground diaphragm wall joint

Abstract

The utility model discloses an underground diaphragm wall joint post-sticking steel plate water stop structure which is characterized in that I-shaped steel is arranged between an early-stage groove section underground diaphragm wall and a later-stage groove section underground diaphragm wall, one side of the I-shaped steel is fixed with the early-stage groove section underground diaphragm wall, a post-sticking steel plate is arranged at the bottom of the other side of the I-shaped steel, and one end of the post-sticking steel plate is welded with the bottom of the I-shaped steel; geotechnical cloth and a water swelling strip are arranged at the position of the rear-attached steel plate, the geotechnical cloth is close to the I-shaped steel, the water swelling strip is close to the later groove section diaphragm wall, and the rear-attached steel plate is divided into a first area and a second area; and cement (such as quick-setting cement) is arranged in a gap between the rear sticking steel plate and the underground diaphragm wall of the later groove section. The water-swelling waterstop strip disclosed by the utility model can rapidly swell after encountering water to fill gaps, and the waterstop effect is further enhanced due to the arrangement of the geotechnical cloth. The rear attaching steel plate is fixed through the expansion bolts and welding, the structure is stable, and the fixing quality is high.

Description

Technical Field

[0001] The utility model relates to a ground-connected wall joint post-attached steel plate water-stopping structure, in which a steel plate is sealed at the joint position of a ground-connected wall groove section, and a geotextile and a water-swelling water-stopping strip are arranged between the steel plate and the wall joint, forming a late pre-water-stopping measure. Background Art

[0002] In the field of rail transit construction in my country, the construction method of underground stations tends to adopt the open-cut method. Although this construction method is mature and effective, the construction location is usually in the core area of ​​the city, the surrounding environment is complex and changeable, various municipal pipelines are crisscrossed, and buildings are densely distributed. Therefore, when constructing underground stations, the impact on the surrounding environment must be fully considered to ensure the safety and stability of the construction process.

[0003] In areas with fine sand layers, the potential impact of foundation pit excavation on the surrounding environment is more significant. In order to reduce this impact and protect the safety of surrounding buildings and municipal pipelines, the design and construction of foundation pit retaining structures are particularly important. At present, many engineering practices have shown that the structural system combining ground-connected walls and internal supports is an effective solution.

[0004] As a continuous and rigid retaining structure, the ground-connected wall can effectively resist the lateral earth pressure and water pressure during the excavation of the foundation pit and maintain the stability of the foundation pit. The internal support is set up in the foundation pit through steel support or concrete support, which further enhances the overall stability and bearing capacity of the retaining structure. This structural system can not only effectively reduce the disturbance of the foundation pit excavation to the surrounding environment, but also improve construction efficiency and reduce engineering costs.

[0005] Therefore, in the construction of rail transit in fine sand layer areas, it has become a common practice to use the structural system of ground-anchored wall + internal support for foundation pit protection. It can not only ensure the safety and stability of the construction process, but also protect the integrity of the surrounding environment to the greatest extent, and contribute to the sustainable development of the city.

[0006] The patent with announcement number CN211421186U discloses a waterproof structure for assembled ground-connected walls, which uses a mortise and tenon structure as a connection method. Air bags are specially arranged between the mortise and tenon structures to ensure the stability and waterproof performance of the overall connection. However, during the use of the air bags, problems such as damage, leakage or displacement may occur due to improper construction, material aging or external forces. Numerous engineering cases have shown that the overall waterproof effect of the ground-connected wall is relatively ideal, but there is a high risk of water leakage due to reasons such as the post-casting trough section at the joint of the ground-connected wall being not in place, which brings great risks to subway construction and may cause serious casualties and property losses. Utility Model Content

[0007] The utility model aims to overcome the deficiencies of the prior art and provide a ground-connected wall joint rear-attached steel plate water-stop structure, which can effectively prevent water from penetrating from the joint by arranging geotextiles and water-swelling water-stop strips on the rear-attached steel plate.

[0008] The purpose of this utility model is achieved through the following technical solutions:

[0009] A water-stopping structure of a post-attached steel plate at a ground-connected wall joint, wherein an I-beam is arranged between the ground-connected wall of an early trough section and the ground-connected wall of a late trough section, one side of the I-beam is fixed to the ground-connected wall of the early trough section, a post-attached steel plate is arranged at the bottom of the other side of the I-beam, and one end of the post-attached steel plate is welded to the bottom of the I-beam;

[0010] Geotextile and water-swelling waterstop strips are set at the rear steel plate, wherein the geotextile is close to the I-steel, and the water-swelling waterstop strips are close to the ground-connected wall of the later trench section. The rear steel plate is divided into a first area and a second area, wherein the I-steel is set in the first area, and the geotextile and water-swelling waterstop strips are covered in the second area;

[0011] Reserved screw holes are set on the rear-attached steel plate, and the rear-attached steel plate is fixed to the later trough section ground connecting wall through expansion bolts. The expansion bolts pass through the reserved screw holes and are fixed to the later trough section ground connecting wall; cement is set in the gap between the rear-attached steel plate and the later trough section ground connecting wall.

[0012] One side of the steel plate is welded to the I-beam of the ground-connected wall joint in the ground-connected wall joint, and the other side is fixed to the wall with expansion bolts. At the same time, geotextile and water-swelling waterstop strips are set between the steel plate and the wall joint. After tightening the expansion bolts, the outer periphery of the steel plate is filled with quick-drying cement to form a comprehensive waterstop solution.

[0013] As a preferred embodiment, the I-beam includes a long wing plate and a short wing plate, the short wing plate is fixed to the ground wall of the previous trough section, and the long wing plate is suspended in the air.

[0014] As a preferred method, an embedded steel plate A is set in the ground connection wall of the early trough section, and the embedded steel plate A is welded to the short wing plate. As a preferred method, an embedded steel plate B is set in the ground connection wall of the later trough section, and the embedded steel plate B is connected with the expansion bolt. As a preferred method, an assembly steel part with a U-shaped cross section is set at the end of the embedded steel plate B, and the top and bottom of the assembly steel part are welded to the embedded steel plate B set in the ground connection wall of the later trough section.

[0015] As a preferred embodiment, the assembled steel parts include a first horizontal plate, a second inclined plate, a third vertical plate, a fourth inclined plate and a fifth horizontal plate; the first horizontal plate, the second inclined plate, the third vertical plate, the fourth inclined plate and the fifth horizontal plate are connected in sequence; the fifth horizontal plate is connected with expansion bolts.

[0016] As a preferred method, the third vertical plate is arranged close to the web of the I-beam, and a gap is left between the third vertical plate and the web of the I-beam; the long wing plate of the I-beam is provided with a first baffle, the second inclined plate is provided with a second baffle, and a rubber water stop strip is provided between the second inclined plate and the long wing plate of the I-beam. The rubber water stop strip is extruded and assembled between the second inclined plate and the long wing plate of the I-beam and is blocked by the first baffle strip and the second baffle strip.

[0017] As a preferred method, the expansion bolts pass through the embedded steel plate B and the fifth horizontal plate in sequence and are fixed in the ground connection wall of the later slot section.

[0018] As a preferred embodiment, the post-bonded steel plate is welded to the bottom portion corresponding to the web of the I-beam.

[0019] As a preferred embodiment, the post-bonded steel plate is a whole formed by welding a plurality of steel plates.

[0020] The utility model has at least the following beneficial effects: the water-expandable waterstop strip of the utility model can expand rapidly after encountering water, fill the gap, and fit tightly with the rear-attached steel plate and the later trough section ground connection wall to prevent the passage of water. At the same time, the provision of the geotextile further enhances the water-stopping effect and ensures the sealing of the joints. The provision of the I-beam makes the entire waterstop structure more stable. One side of the I-beam is fixed to the earlier trough section ground connection wall, and the other side is connected to the later trough section ground connection wall through the rear-attached steel plate, forming a stable support system. The utility model fixes the rear-attached steel plate by expansion bolts and welding. The order can be to first use the expansion bolts to make an initial positioning, and then fix it by welding. The structure is stable and the fixing quality is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of part A;

[0024] Figure 3 This is a schematic diagram of welding of the post-bonded steel plate;

[0025] Figure 4 This is a schematic diagram of the post-pasted steel plate structure;

[0026] In the figure, 1-early trench section ground connecting wall, 2-later trench section ground connecting wall, 3-rear-attached steel plate, 4-geotextile, 5-water-swelling waterstop, 6-expansion bolts, 7-weld, 8-quick-drying cement, 9-I-beam, 10-first retaining bar, 11-rubber waterstop, 12-second retaining bar, 13-reserved screw holes. DETAILED DESCRIPTION

[0027] The technical solution of the present utility model is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0028] Hereinafter, different embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that the present disclosure is not limited to the specific form disclosed herein, but rather, the present disclosure should be interpreted as covering different changes, equivalents and / or replacements of the embodiments of the present disclosure. When describing the accompanying drawings, similar reference numerals may be used to indicate similar components.

[0029] The expressions used in different embodiments of the present disclosure, if there is "first", "second", "the first" or "the second" can modify different elements, regardless of order and / or importance, without limiting the corresponding elements. For example, a first user device and a second user device refer to different user devices, although both of them are user devices. For example, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element without departing from the scope of the present disclosure.

[0030] In the present disclosure, the terms are used to describe specific embodiments and do not limit the present disclosure. As used herein, the singular form is intended to also include the plural form, unless the content clearly indicates otherwise. In the specification, it should be understood that the term "including" or "having" represents the presence of a feature, number, step, operation, structural element, component or combination thereof, without excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, structural elements, components or combinations thereof.

[0031] like Figure 1 , Figure 2 As shown, a water-stop structure of a post-attached steel plate 3 at a ground-connected wall joint, an I-beam 9 is arranged between an early trough section ground-connected wall 1 and a late trough section ground-connected wall 2, one side of the I-beam 9 is fixed to the early trough section ground-connected wall 1, a post-attached steel plate 3 (i.e., a steel plate installed later) is arranged at the bottom of the other side of the I-beam 9, and one end of the post-attached steel plate 3 is welded to the bottom of the I-beam 9;

[0032] A geotextile 4 and a water-swelling waterstop strip 5 are arranged at the rear-attached steel plate 3, wherein the geotextile 4 is close to the I-steel 9, and the water-swelling waterstop strip 5 is close to the later trench section ground connection wall 2. The rear-attached steel plate 3 is divided into a first area and a second area, wherein the I-steel 9 is arranged in the first area, and the geotextile 4 and the water-swelling waterstop strip 5 are covered in the second area;

[0033] like Figure 4 As shown, a reserved screw hole 13 (Φ25mm) is set on the rear-attached steel plate 3, and the rear-attached steel plate 3 is fixed to the later groove section ground connecting wall 2 through the expansion bolt 6, and the expansion bolt 6 passes through the reserved screw hole 13 and is fixed to the later groove section ground connecting wall 2; cement is set in the gap between the rear-attached steel plate 3 and the later groove section ground connecting wall 2.

[0034] The geotextile 4 of this embodiment can prevent soil from entering the joints, and the water-swelling waterstop strip 5 can expand and fill the gaps after encountering water, further improving the waterstop effect and enhancing the reliability and stability of the structure. Through the coordinated use of components such as the I-beam 9 and the rear-attached steel plate 3, the waterstop function of the joint is achieved, which can effectively prevent groundwater from penetrating through the joints, improve the waterproof performance of the ground-connected wall, and ensure the quality and safety of the project. In addition, the fixing method of this embodiment makes the rear-attached steel plate 3 firmly connected and not easy to loosen, thereby ensuring the stability and durability of the waterstop structure.

[0035] In a preferred embodiment, the I-beam 9 includes a long wing plate (e.g., 880 mm) and a short wing plate (e.g., 460 mm). The long and short in the present invention are only used to indicate relative length and shortness, and may not be used to limit specific dimensions. The short wing plate is fixed to the pre-groove section ground connecting wall 1, and the long wing plate is suspended. This embodiment sets long and short wing plates as needed, which can flexibly adapt to different construction environments and requirements, while ensuring the stability and strength of the structure.

[0036] In a preferred embodiment, a pre-buried steel plate A is arranged in the pre-groove section ground connection wall 1, and the pre-buried steel plate A is welded to the short wing plate. The welding connection between the pre-buried steel plate A and the short wing plate makes the whole structure more stable, and improves the integrity and reliability of the water-stopping structure.

[0037] In a preferred embodiment, a pre-buried steel plate B is provided in the later trough section ground connection wall 2, and the pre-buried steel plate B is connected with the expansion bolt 6. This embodiment enables the expansion bolt 6 to be firmly fixed in the later trough section ground connection wall 2, providing reliable support for the fixation of the later attached steel plate 3.

[0038] In a preferred embodiment, a U-shaped assembly steel piece is provided at the end of the embedded steel plate B, and the top and bottom of the assembly steel piece are welded to the embedded steel plate B provided in the later trough section ground connection wall 2. The assembly steel piece can limit the upper and lower positions of the later trough section ground connection wall 2 to avoid transitional fluctuations.

[0039] In a preferred embodiment, the assembled steel parts include a first horizontal plate, a second inclined plate, a third vertical plate, a fourth inclined plate and a fifth horizontal plate; the first horizontal plate, the second inclined plate, the third vertical plate, the fourth inclined plate and the fifth horizontal plate are connected in sequence; the fifth horizontal plate is connected to the expansion bolts 6.

[0040] In a preferred embodiment, the third vertical plate is arranged close to the web of the I-beam 9, and a gap is left between the third vertical plate and the web of the I-beam 9; the long wing of the I-beam 9 is provided with a first stopper 10, the second inclined plate is provided with a second stopper 12, and a rubber water stopper 11 is provided between the second inclined plate and the long wing of the I-beam 9, and the rubber water stopper 11 is extruded and assembled between the second inclined plate and the long wing of the I-beam 9 and is blocked by the first stopper 10 and the second stopper 12. This embodiment enables the rubber water stopper 11 to fit tightly between the long wing of the I-beam 9 and the second inclined plate of the assembled steel part, effectively preventing water from penetrating from the joint and improving the water stopping effect.

[0041] In a preferred embodiment, the geotextile 4 is a short-fiber geotextile 4 or a short-filament geotextile 4, and the specification can be 200g / m 2 -400g / m 2 Range, cut into 500mm wide and long strips, requiring excellent properties such as light weight, high strength, low cost, corrosion resistance, etc., mainly plays the role of sand filtering and filling.

[0042] In a preferred embodiment, the water-swellable waterstop strip 5 expands and deforms 2-3 times when in contact with water, and fills all irregular surfaces, cavities and gaps of the joint, while generating huge contact pressure to completely prevent leakage.

[0043] In a preferred embodiment, the expansion bolts 6 (such as M20 expansion bolts 6 with a length of 200 mm) pass through the embedded steel plate B and the fifth horizontal plate in sequence and are fixed in the later trough section ground connection wall 2. This fixing method enables the expansion bolts 6 to be firmly fixed in the later trough section ground connection wall 2, thereby ensuring the stability of the later steel plate 3 and the entire water-stopping structure.

[0044] In a preferred embodiment, the water-swellable water stop strip 5 is inserted into the gap between the rear-attached steel plate 3 and the later-stage trench section ground connecting wall 2. The rear-attached steel plate 3 is welded to the bottom corresponding to the web of the I-beam 9. The water-swellable water stop strip 5 can expand and fill the gap after encountering water, further improving the water-stopping effect; the welding of the rear-attached steel plate 3 and the bottom of the web of the I-beam 9 enhances the stability and strength of the entire structure.

[0045] In a preferred embodiment, Figure 3 As shown, the post-bonded steel plate 3 is a whole formed by welding a plurality of steel plates, and weld seams 7 are formed between the steel plates for easy assembly.

[0046] The utility model provides a method for stopping water in a ground-to-wall joint, and the implementation steps are as follows:

[0047] a. Excavate the foundation pit. After the foundation pit at the corresponding wall joint is excavated, clean the loose soil on both sides of the underground continuous wall joint. It is strictly forbidden to dig the mud in the joint. Use a pneumatic pick / hammer to chisel the concrete of the ground-connected wall 2 in the later slot section of the joint to the vicinity of the flange plate (the upper long wing plate) of the ground-connected wall I-beam 9 (flush or slightly higher than the upper long wing plate);

[0048] b. Fully weld one side of the pre-processed back-attached steel plate 3 to the I-beam 9 (bottom) to form a weld 7;

[0049] c. After completing step b, the geotextile cut into strips 4 should be inserted into the gap between the rear-attached steel plate 3 and the later-stage trench section ground-connected wall 2;

[0050] d. After completing step c, insert the water-expandable waterstop strip 5 into the gap between the rear-attached steel plate 3 and the later-stage trough section ground connecting wall 2 to ensure accurate positioning;

[0051] e. Use an electric drill to drill holes in the reserved bolt holes of the post-attached steel plate 3 for the later slot section ground connection wall 2. After the holes are completed, check the drilling depth, which should be controlled at 150-160mm. Install expansion bolts 6 to fix and tighten the post-attached steel plate 3 to ensure that the surface of the post-attached steel plate 3 is flush with the concrete surface of the later slot section ground connection wall 2 next to the joint.

[0052] e. After the post-attachment steel plate 3 is fixed, the gap between one side of the post-attachment steel plate 3 and the later trench section ground connection wall 2 is sealed with quick-drying cement 8;

[0053] F. After the first steel plate is sealed, add another steel plate downwards. The other steps are the same as the above process requirements. The gap between the steel plates should not be greater than 1cm. After the next steel plate is completed, weld it together.

[0054] The utility model provides a pre-treatment water-stopping solution of steel plate + geotextile 4 + water-swelling waterstop strip 5 to solve the water leakage at the joint of the ground-connected wall. The utility model plays the role of filtering sand and stopping water, and can fill the gap between the uneven contact surface of the post-attached steel plate 3 and the joint of the ground-connected wall. The utility model can not only effectively control the water and sand gushing in the foundation pit caused by the excessive deformation of the ground-connected wall joint due to the excavation and unloading of the foundation pit, and reduce the risk of leakage in the ground-connected wall joint during the excavation of the foundation pit, but also, if the deformation of the ground-connected wall in the later stage is really too large and exceeds the design control range, the geotextile 4 provided in the utility model can still play a role of anti-filtration, effectively restraining the outflow of soil particles and sand particles, and the water-swelling waterstop strip 5 can play a role of sealing and stopping water when it expands in water, reduce the severity of water leakage, and ensure the overall safety of the foundation pit and the safety of surrounding structures.

[0055] Although the preferred embodiments of the utility model have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A waterproof structure with steel plates attached to the joints of the ground and walls, characterized in that: An I-beam is arranged between the ground connection wall of the early trough section and the ground connection wall of the late trough section, one side of the I-beam is fixed to the ground connection wall of the early trough section, a rear-attached steel plate is arranged at the bottom of the other side of the I-beam, and one end of the rear-attached steel plate is welded to the bottom of the I-beam; Geotextile and water-swelling waterstop strips are set at the rear steel plate, wherein the geotextile is close to the I-steel, and the water-swelling waterstop strips are close to the ground-connected wall of the later trench section. The rear steel plate is divided into a first area and a second area, wherein the I-steel is set in the first area, and the geotextile and water-swelling waterstop strips are covered in the second area; Reserved screw holes are set on the rear-attached steel plate, and the rear-attached steel plate is fixed to the later trough section ground connecting wall through expansion bolts. The expansion bolts pass through the reserved screw holes and are fixed to the later trough section ground connecting wall; cement is set in the gap between the rear-attached steel plate and the later trough section ground connecting wall.

2. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 1 is characterized by: The I-beam includes a long wing plate and a short wing plate. The short wing plate is fixed to the ground wall of the previous trough section, and the long wing plate is suspended in the air.

3. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 2 is characterized by: An embedded steel plate A is set in the ground connection wall of the early trench section, and the embedded steel plate A is welded to the short wing plate.

4. A ground-to-wall joint rear-attached steel plate waterproof structure according to any one of claims 1-3, characterized in that: In the later stage, embedded steel plate B is arranged in the ground-connected wall of the trench section, and the embedded steel plate B is connected with the expansion bolts.

5. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 4 is characterized by: The end of the embedded steel plate B is provided with an assembly steel part with a U-shaped cross section, and the top and bottom of the assembly steel part are welded to the embedded steel plate B arranged in the ground-connected wall of the later trench section.

6. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 5 is characterized by: The assembled steel parts include a first horizontal plate, a second inclined plate, a third vertical plate, a fourth inclined plate and a fifth horizontal plate; the first horizontal plate, the second inclined plate, the third vertical plate, the fourth inclined plate and the fifth horizontal plate are connected in sequence; and the fifth horizontal plate is connected with expansion bolts.

7. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 6 is characterized by: The third vertical plate is arranged close to the web of the I-beam, and a gap is left between the third vertical plate and the web of the I-beam; the long wing plate of the I-beam is provided with a first baffle, the second inclined plate is provided with a second baffle, and a rubber water stop strip is provided between the second inclined plate and the long wing plate of the I-beam. The rubber water stop strip is extruded and assembled between the second inclined plate and the long wing plate of the I-beam and is blocked by the first baffle strip and the second baffle strip.

8. The water-stopping structure with steel plate attached to the ground-to-wall joint according to claim 6 is characterized by: The expansion bolts pass through the embedded steel plate B and the fifth horizontal plate in sequence and are fixed in the ground-connected wall of the later trench section.

9. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 1 is characterized by: The rear-attached steel plate is welded to the bottom corresponding to the I-beam web.

10. The water-stopping structure with steel plate attached to the ground-wall joint according to claim 1, characterized in that: The post-bonded steel plate is a whole formed by welding several steel plates.

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