Waterproof construction method for steel diagonal bracing outer wall of deep foundation pit

Abstract

The invention relates to the field of waterproof construction of a steel inclined strut penetrating through a basement outer wall, in particular to a novel waterproof construction method of a deep foundation pit steel inclined strut outer wall. The waterproof construction method focuses on the deep foundation pit steel diagonal bracing outer wall, and the construction steps and the corresponding beneficial effects are elaborated in detail. The construction method comprises the steps of determining the number of water stop steel plates according to the thickness of an outer wall, positioning water stop rings by measuring the side lines of the outer wall, determining the angle of a steel inclined strut, welding the water stop rings to the steel inclined strut to form a waterproof structural component, chiseling, cleaning and enhancing bonding at the joint of the steel inclined strut and the outer wall after installation, and blocking with an adaptive material process. And finally, a flexible waterproof layer is laid with polyurethane waterproof paint, and concrete is poured for protection. The steps effectively improve the waterproof performance, guarantee the installation precision of the waterproof structure, enhance the construction feasibility, realize cost control, ensure the waterproof durability, and provide a reliable scheme for the waterproof engineering of the deep foundation pit steel diagonal bracing outer wall.

Description

Technical Field

[0001] The invention relates to the field of waterproofing construction with steel diagonal braces passing through the outer wall of a basement, and specifically to a novel waterproofing construction method for the outer wall of a deep foundation pit with steel diagonal braces. Background Art

[0003] In the design of deep foundation pit support, the most common type is the cast-in-place pile inserted steel lattice column concrete horizontal support structure. Some foundation pits with more complex construction conditions may need to add steel diagonal braces to increase the support structure's resistance to lateral displacement and overturning. This type of support structure requires a replacement process due to its particularity of construction. The steel diagonal brace needs to pass through the outer wall of the basement and can only be replaced after the concrete of the current structure is poured. As one of the most important parts of the waterproofing division in the construction project, the basement needs to focus on the construction quality of each node. However, in the actual construction process, the difficulty of on-site construction or other subjective and objective conditions often cause defects in the construction quality of the waterproof structure, causing leakage defects in some structures of the basement. Summary of the invention

[0004] In order to thoroughly solve the problems of no standard for setting water-stop steel plates, easy deviation in positioning and angle, insufficient welding and detection, improper handling of joints, substandard sealing materials and processes, and lack of waterproof construction and protection in the existing deep foundation pit steel diagonal brace external wall waterproof construction, the present invention proposes the following technical solutions: A deep foundation pit steel diagonal brace external wall waterproof construction method, characterized by comprising the following steps: S1: According to the engineering design requirements and the actual conditions of the exterior wall, determine the number of water-stop steel plates to be set at the places where the steel diagonal brace passes through the exterior wall. The water-stop steel plate can extend the water penetration path and use its own physical barrier effect to effectively prevent groundwater from infiltrating through the connection between the steel diagonal brace and the exterior wall. Setting different numbers of water-stop steel plates according to the thickness of the basement exterior wall is to reasonably allocate the water-stop defense line under different waterproofing requirements, ensure that the waterproofing effect matches the actual situation of the project, maximize the use of material resources, and achieve a balance between cost and quality.

[0005] S2: By measuring the inner and outer edges of the exterior wall, the specific position of the water stop ring on the steel brace is determined according to the positional relationship between the exterior wall and the steel brace, and the inclination angle of the steel brace is also determined. Accurately measuring the inner and outer edges of the exterior wall can accurately determine the relative positional relationship between the steel brace and the exterior wall, thereby accurately positioning the water stop ring. The water stop ring is installed at a specific position of the steel brace, and can form an effective waterproof barrier at the contact point between the exterior wall and the steel brace. Clarifying the inclination angle of the steel brace will help the accuracy of subsequent construction and ensure that the entire waterproof structure can stably play a waterproof role under stress conditions at different angles.

[0006] S3: According to the determined position of the water stop ring, weld the water stop ring to the steel diagonal brace so that the two form a complete waterproof structural component. The water stop ring is firmly fixed to the steel diagonal brace by welding to form a tightly connected whole. This ensures that during the subsequent construction and use, the water stop ring will not be displaced due to external forces or other factors, ensuring the integrity and stability of the waterproof structure, thereby effectively preventing groundwater from penetrating along the gap between the steel diagonal brace and the exterior wall.

[0007] S4: Install waterproof structural components, then chisel the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete, clean up the debris generated by chiseling, and do bonding enhancement treatment. Chiseling the intersection can remove the floating slurry and loose parts on the surface, increase the roughness of the intersection, and enable the subsequent sealing materials and waterproof layer to better bond with it. Cleaning up the debris avoids the influence of impurities on the bonding effect, and applying the interface agent further enhances the bonding between the intersection and the subsequent materials, improving the reliability of the waterproof system.

[0008] S5: Use appropriate materials and processes to seal the intersection of the steel brace through the exterior wall and the exterior wall concrete. Use a higher grade of impermeable fine stone concrete for sealing and make it into a round or square boss to fill the gap between the steel brace and the exterior wall. Relying on the density and impermeability of the fine stone concrete, a solid waterproof barrier is formed. The design of the boss increases the contact area of ​​the waterproof, further improves the waterproof effect, and effectively prevents groundwater leakage.

[0009] S6: After the joint is sealed and reaches the corresponding strength, waterproof construction is carried out on the joint. Waterproof construction is carried out after the sealing is completed and the strength reaches the requirements, which can ensure that the waterproof construction is carried out on a stable basis. At this time, the materials used in the waterproof construction can better exert their waterproof performance, cooperate with the sealing materials, and form a complete waterproof system, thereby effectively preventing groundwater from penetrating from the steel diagonal brace through the outer wall.

[0010] Preferably, in the above S1, when determining the number of water-stop steel plates to be set at the places where the steel brace passes through the outer wall, it should be set differently according to the thickness of the outer wall of the basement. If the thickness of the outer wall of the basement is greater than 500 mm, two water-stop steel plates need to be set. If the thickness of the outer wall of the basement is less than or equal to 500 mm, one water-stop steel plate is set. When the outer wall of the basement is thicker, the groundwater infiltration path is relatively long. Setting two water-stop steel plates can form a double waterproof line of defense at different positions, further extend the water infiltration path, and improve the waterproof effect. For thinner outer walls, setting one water-stop steel plate can avoid excessive waste of materials while meeting the waterproof requirements, thus achieving a balance between economy and practicality.

[0011] Preferably, when two waterstop steel plates are provided, the outer edge of one of the waterstop steel plates is 50 mm vertically away from the outer wall of the basement, and the outer edge of the other waterstop steel plate is 25 mm vertically away from the outer surface of the inner wall of the basement, and the outer edge size of the inner waterstop steel plate is 50 mm larger than the outer edge size of the outer waterstop steel plate. Such a setting can make the two waterstop steel plates form staggered waterproof barriers at different depths and positions. The waterstop steel plate closer to the outer wall first blocks part of the groundwater, and the other waterstop steel plate closer to the inner wall serves as the second line of defense to further block water that may bypass the first waterstop steel plate. The inner waterstop steel plate is larger in size and can cover more areas, enhancing the waterproof effect and ensuring that groundwater cannot easily penetrate into the room through the connection between the steel diagonal brace and the outer wall.

[0012] Preferably, in S2, when determining the inclination angle of the steel brace, the inner and outer edges of the exterior wall are positioned, and the angle of the intersection of the inner and outer edges of the exterior wall and the steel brace is the inclination angle of the steel brace. Determining the inclination angle by the intersection of the inner and outer edges of the exterior wall and the steel brace is based on mathematical and geometric principles and can accurately obtain the actual angle of the steel brace in space. This angle is crucial for the subsequent installation of the water stop ring and the construction of the entire waterproof structure. Only by ensuring the accuracy of the angle can the waterproof structure function effectively under different stress conditions and avoid failure of the waterproof structure due to angle deviation.

[0013] Preferably, in S3, when the water stop ring is welded to the steel diagonal brace, the steel diagonal brace to be installed is welded on both sides of the water stop, and the length of both sides of the water stop ring is determined according to the position of the water stop ring in S2. Welding both sides of the water stop ring to the steel diagonal brace ensures a firm connection between the water stop ring and the steel diagonal brace, preventing loosening or falling off during construction and use. Determining the length of both sides according to the position of the water stop ring can ensure that the installation position of the water stop ring on the steel diagonal brace is accurate, so that the water stop ring can play a waterproof role in the most effective position, thereby improving the reliability of the entire waterproof structure.

[0014] Preferably, in the S4, when the chiseling process is performed, the intersection of the steel diagonal brace passing through the exterior wall and the exterior wall concrete needs to be chiseled into a notch with a depth of about 20-30mm, and the loose stones and concrete debris at the notch need to be removed, and the interface agent needs to be coated. When the chiseling process is performed, the intersection of the steel diagonal brace passing through the exterior wall and the exterior wall concrete needs to be chiseled into a notch with a depth of about 20-30mm, and the loose stones and concrete debris at the notch need to be removed, and the interface agent needs to be coated. Chiseling a notch of a certain depth can increase the surface area of ​​the intersection, so that the subsequent filling materials can be better combined with the original structure. Cleaning up the loose stones and concrete debris eliminates the adverse factors that affect bonding and ensures the cleanliness of the interface. The coating interface agent forms a transition layer between the original structure and the subsequent filling material, which enhances the bonding between the two and improves the overall stability of the waterproof system.

[0015] Preferably, in the S5, when performing the plugging operation, it is necessary to fill the interface between the steel brace and the outer wall with a higher grade of impermeable fine stone concrete, and the fine stone concrete is made into a circular or square boss with a thickness of 10-20 mm. The higher grade of impermeable fine stone concrete has higher strength and better impermeability, and can effectively fill the gap between the steel brace and the outer wall to prevent the penetration of groundwater. The circular or square boss is made to increase the waterproof contact area, so that the waterproof effect is further improved. The shape and thickness design of the boss have been verified by engineering practice, and can ensure the stability of the structure while ensuring the waterproof effect.

[0016] Preferably, in the above S6, when carrying out waterproof construction, it is necessary to use polyurethane waterproof coating to lay a flexible waterproof layer. Polyurethane waterproof coating has good flexibility, adhesion and water resistance. Laying polyurethane waterproof coating at the junction to form a flexible waterproof layer can adapt to slight deformation of the structure and prevent the waterproof layer from breaking due to structural deformation. Its good adhesion ensures the close combination between the waterproof layer and the base layer, and its water resistance ensures that the waterproof layer can still maintain good waterproof performance when in contact with water for a long time.

[0017] Preferably, after the waterproof layer is laid, concrete needs to be poured on the waterproof layer to protect the waterproof layer. Pouring a concrete protective layer on the waterproof layer can prevent the waterproof layer from being damaged by external factors, such as mechanical damage during construction, external force impact during subsequent use, etc. The concrete protective layer can also isolate ultraviolet rays and other chemical substances from erosion, extend the service life of the waterproof layer, and ensure that the entire waterproof system continues to effectively perform its waterproof function during the service life of the building.

[0018] The beneficial effects of the present invention are: 1. The present invention accurately sets the number and position of water-stop steel plates according to the thickness of the basement outer wall, effectively preventing groundwater infiltration. The firm welding of the water-stop ring and the steel diagonal brace, as well as the fine chiseling, sealing and waterproofing construction at the junction, build a strict waterproof system from multiple links, greatly reduce the risk of leakage, ensure the waterproof effect of the basement, and extend the service life of the building.

[0019] 2. The present invention determines the position of the water stop ring and the inclination angle of the steel brace by measuring the inner and outer edges of the exterior wall, providing an accurate basis for subsequent construction. The standardized welding process and the clear method for determining the length of the water stop ring ensure the installation accuracy of the waterproof structural components, making the entire waterproof structure stable and reliable, and meeting the requirements of engineering design.

[0020] 3. Each construction step of the present invention has clear operating standards and parameters, which are easy for construction personnel to understand and implement. For example, the depth of chiseling at the junction, the selection of sealing materials and construction technology, the laying requirements of the waterproof layer, etc., are all specified in detail, which reduces the uncertainty in the construction process, improves the construction efficiency, and ensures the smooth progress of the project.

[0021] 4. The present invention reasonably sets the water-stop steel plate according to the thickness of the outer wall, avoids unnecessary material waste, and effectively controls the project cost while ensuring the waterproof quality. At the same time, due to the standardized construction steps, the rework cost caused by construction quality problems is reduced, achieving a balance between cost and quality.

[0022] 5. The present invention uses polyurethane waterproof coating to lay a flexible waterproof layer, and pours concrete on it for protection, which enhances the anti-destruction ability and durability of the waterproof layer, enables the waterproof effect to play a long-term and stable role, and reduces the subsequent maintenance costs and potential losses caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a flowchart of the steps of a deep foundation pit steel diagonal brace exterior wall waterproofing construction method. DETAILED DESCRIPTION

[0024] A deep foundation pit steel diagonal brace exterior wall waterproofing construction method comprises the following steps: S1: According to the engineering design requirements and the actual conditions of the exterior wall, determine the number of water-stop steel plates to be set at the places where the steel diagonal brace passes through the exterior wall. When determining the number of water-stop steel plates to be set at the places where the steel diagonal brace passes through the exterior wall, it should be set differently according to the thickness of the exterior wall of the basement. If the thickness of the exterior wall of the basement is greater than 500mm, two water-stop steel plates are required. If the thickness of the exterior wall of the basement is less than or equal to 500mm, one water-stop steel plate is required. When two water-stop steel plates are set, the outer edge of one of the water-stop steel plates is 50mm away from the exterior wall of the basement, and the outer edge of the other water-stop steel plate is 25mm away from the outer surface of the interior wall of the basement. The outer edge size of the inner water-stop steel plate is 50mm larger than the outer edge size of the outer water-stop steel plate.

[0025] S2: By measuring the inner and outer edges of the exterior wall, determine the specific position of the water stop ring on the steel brace according to the position relationship between the exterior wall and the steel brace, and at the same time determine the inclination angle of the steel brace. When determining the inclination angle of the steel brace, locate the inner and outer edges of the exterior wall, and the angle of the intersection of the inner and outer edges of the exterior wall and the steel brace is the inclination angle of the steel brace.

[0026] S3: According to the determined position of the water stop ring, weld the water stop ring to the steel diagonal brace so that the two form a complete waterproof structural component. When the water stop ring is welded to the steel diagonal brace, the steel diagonal brace to be installed is welded on both sides of the water stop, and the length of both sides of the water stop ring is determined according to the position of the water stop ring in S2.

[0027] S4: Install waterproof structural components, then chisel the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete, clean up the debris generated by chiseling, and do bonding enhancement treatment. When chiseling, the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete needs to be chiseled into a groove with a depth of about 20-30mm, and the loose stones and concrete debris in the groove must be removed cleanly, and the interface agent must be applied.

[0028] S5: Use appropriate materials and processes to seal the intersection of the steel brace through the exterior wall and the exterior wall concrete. When sealing, fill the interface between the steel brace and the exterior wall with a higher grade of impermeable fine stone concrete, which is made into a 10-20mm thick round or square boss.

[0029] S6: After the joint is sealed and reaches the corresponding strength, waterproof construction is carried out on the joint. When carrying out waterproof construction, polyurethane waterproof coating is needed to lay the flexible waterproof layer. After the waterproof layer is laid, concrete needs to be poured on the waterproof layer to protect it.

[0030] Example When waterproofing the deep foundation pit steel diagonal brace exterior wall of the basement, the specific steps are as follows: S1: According to the engineering design requirements and the actual conditions of the exterior wall, determine the number of water-stop steel plates to be set at the place where the steel diagonal brace passes through the exterior wall. Different settings are made according to the thickness of the basement exterior wall. If the thickness of the basement exterior wall is greater than 500mm, two water-stop steel plates are required; if it is less than or equal to 500mm, one water-stop steel plate is required. When two water-stop steel plates are set, the outer edge of one water-stop steel plate is 50mm away from the outer wall of the basement, and the outer edge of the other water-stop steel plate is 25mm away from the outer surface of the inner wall of the basement, and the outer edge size of the inner water-stop steel plate is 50mm larger than the outer edge size of the outer water-stop steel plate.

[0031] S2: By measuring the inner and outer edges of the exterior wall, determine the specific position of the water stop ring on the steel brace according to the position relationship between the exterior wall and the steel brace, and at the same time determine the inclination angle of the steel brace. When determining the inclination angle of the steel brace, locate the inner and outer edges of the exterior wall, and the angle of the intersection of the inner and outer edges of the exterior wall and the steel brace is the inclination angle of the steel brace.

[0032] S3: According to the determined position of the water stop ring, weld the water stop ring to the steel diagonal brace so that the two form a complete waterproof structural component. The steel diagonal braces to be installed are welded on both sides of the water stop, and the length of both sides of the water stop ring is determined according to the position of the water stop ring in S2.

[0033] S4: Install waterproof structural components, then chisel the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete, chisel the intersection into a groove with a depth of about 20-30mm, remove the loose stones and concrete debris in the groove, and apply the interface agent.

[0034] S5: Use appropriate materials and processes to seal the intersection of the steel brace through the exterior wall and the exterior wall concrete. Fill the interface between the steel brace and the exterior wall with a higher grade of impermeable fine stone concrete, which is made into a 10-20mm thick round or square boss.

[0035] S6: After the joint is sealed and reaches the corresponding strength, waterproof construction is carried out on the joint. Use polyurethane waterproof coating to lay the flexible waterproof layer. After the waterproof layer is laid, pour concrete on the waterproof layer to protect it.

Claims

1. A deep foundation pit steel diagonal brace exterior wall waterproofing construction method, characterized in that: The following steps are involved: S1: Determine the number of water-stop steel plates to be installed where the steel diagonal brace passes through the exterior wall based on the engineering design requirements and the actual conditions of the exterior wall; S2: By measuring the inner and outer edges of the exterior wall, the specific position of the water stop ring on the steel brace is determined according to the position relationship between the exterior wall and the steel brace, and the inclination angle of the steel brace is determined at the same time; S3: According to the determined position of the water stop ring, weld the water stop ring to the steel diagonal brace so that the two form a complete waterproof structural component; S4: Install waterproof structural components, then chisel the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete, clean up the debris generated by chiseling, and perform bonding enhancement treatment; S5: Use appropriate materials and techniques to seal the junction between the steel diagonal brace passing through the exterior wall and the exterior wall concrete; S6: After the joint is sealed and reaches the corresponding strength, waterproof construction is carried out on the joint.

2. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 1, characterized in that: In the above S1, when determining the number of waterstop steel plates to be set at the place where the steel diagonal brace passes through the outer wall, it should be set differently according to the thickness of the basement outer wall. If the thickness of the basement outer wall is greater than 500mm, two waterstop steel plates need to be set. If the thickness of the basement outer wall is less than or equal to 500mm, one waterstop steel plate is set.

3. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 2, characterized in that: When two waterstop steel plates are set, the outer edge of one of the waterstop steel plates is 50mm away from the outer wall of the basement, and the outer edge of the other waterstop steel plate is 25mm away from the outer surface of the inner wall of the basement. The outer edge size of the inner waterstop steel plate is 50mm larger than the outer edge size of the outer waterstop steel plate.

4. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 1, characterized in that: In the above S2, when determining the inclination angle of the steel brace, the inner and outer edges of the exterior wall are positioned, and the angle of the intersection of the inner and outer edges of the exterior wall and the steel brace is the inclination angle of the steel brace.

5. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 1, characterized in that: In the above-mentioned S3, when the water stop ring is welded to the steel diagonal brace, the steel diagonal braces to be installed are welded on both sides of the water stop, and the lengths of both sides of the water stop ring are determined according to the position of the water stop ring in S2.

6. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 1, characterized in that: In the above-mentioned S4, when the chiseling treatment is performed, the intersection of the steel diagonal brace through the exterior wall and the exterior wall concrete needs to be chiseled into a groove with a depth of about 20-30mm, and the loose stones and concrete debris at the groove need to be removed cleanly, and the interface agent should be applied.

7. A deep foundation pit steel diagonal brace external wall waterproof construction method according to claim 1, characterized in that: In the above-mentioned S5, when performing the plugging operation, it is necessary to fill the interface between the steel diagonal brace and the outer wall with a higher grade of impermeable fine stone concrete, and the fine stone concrete is made into a round or square boss with a thickness of 10-20 mm.

8. A deep foundation pit steel diagonal brace external wall waterproofing construction method according to claim 1, characterized in that: In the above-mentioned S6, when carrying out waterproof construction, it is necessary to use polyurethane waterproof coating to lay a flexible waterproof layer.

9. A deep foundation pit steel diagonal brace external wall waterproofing construction method according to claim 8, characterized in that: After the waterproof layer is laid, concrete needs to be poured on the waterproof layer to protect it.

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