Foundation pit support belt replacement and waterproof joint treatment method

Abstract

The invention relates to a foundation pit support belt replacement and waterproof joint treatment method which comprises the steps that after basement earth excavation is completed, bottom plate cushion layer concrete is poured; a bottom plate waterproof coiled material is constructed on the cushion layer, the waterproof coiled material is upturned on the enclosure structure, and the length for follow-up support belt replacement and lap joint is reserved; after the guide wall formwork is dismantled, support changing belt concrete in a regular shape is poured; after the concrete strength grade of the support belt to be replaced meets the design requirement, the inclined support steel pipe or profile steel is cut off; constructing an upper structure of the basement until positive and negative zero parts of the basement are formed; waterproof coiled materials are constructed on the outer wall of the basement, and meanwhile lap joint treatment is conducted on the supporting belt replacement position; and finally, backfilling and compacting the fertilizer groove between the basement outer wall and the enclosure system by adopting a backfilling material. According to the method, the construction process can be simplified, the waterproof effect is improved, the construction cost is reduced, and the method has wide applicability and operability.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and more specifically, to a foundation pit replacement support belt and a waterproof joint treatment method. Background Art

[0002] In the construction of basement foundation pits, the design and construction of the retaining system are one of the key links. When there are inclined supports in the foundation pit, a replacement support system needs to be designed to ensure the stability of the foundation pit. Traditionally, such a replacement support system is usually achieved by setting corbels, and the corbels are used as support structures to connect the foundation pit and the exterior wall.

[0003] The design of corbels often depends on the specific engineering requirements, with various shapes and it is difficult to unify the standards. This irregularity makes it difficult for the waterproof coiled material to fit tightly with the surface of the corbels during laying, and voids and leakage points are likely to occur. Due to the complex shape of the corbels, the laying and fixing of the waterproof coiled material require higher technical requirements and more construction time, increasing the construction difficulty and cost.

[0004] The voids and uneven contact surfaces between the corbels and the waterproof coiled material are likely to cause groundwater leakage, affecting the service function and safety of the basement. Once leakage problems are found, additional repair work is required, including re-laying the waterproof coiled material, filling voids, etc. This not only increases the construction cost but may also affect the construction period.

[0005] Currently, there is a lack of unified standards and specifications for the treatment methods of foundation pit replacement support belts and waterproof joints, resulting in significant differences in treatment methods and effects between different projects.

[0006] In summary, due to the irregular shape of the corbels in the traditional foundation pit replacement support belt design method, it brings great difficulties to the subsequent treatment of waterproof joints, increasing the leakage risk and construction cost. Summary of the Invention

[0007] The present invention aims to overcome the defects of the prior art and provides a foundation pit replacement support belt and a waterproof joint treatment method to solve the great difficulties brought to the subsequent treatment of waterproof joints due to the relatively irregular shape of the corbels, which may lead to leakage problems in the basement structure.

[0008] To solve the above technical problems, the present invention is implemented as follows: A foundation pit replacement support belt and a waterproof joint treatment method, characterized by including the following steps: Step 1: After the excavation of the basement soil is completed, pour the concrete for the bottom slab cushion. Step 2: Construct the bottom slab waterproof coiled material on the cushion, and the waterproof coiled material turns up on the retaining structure, and the length for the subsequent replacement support belt and lapping is reserved. Step 3: After the formwork of the guide wall is removed, pour the concrete for the replacement support belt with a regular shape. Step 4: After the concrete strength grade of the replacement support belt reaches the design requirements, cut off the diagonal support steel pipe or steel; Step 5: Carry out the construction of the basement superstructure until the basement reaches zero; Step 6: Install waterproof membrane on the exterior wall of the basement and perform overlap treatment at the location where the support strips are replaced; Step 7: Finally, backfill and compact the fertilizer trough between the basement outer wall and the enclosure system with backfill materials.

[0009] The method for replacing support strips and waterproofing nodes in a foundation pit is characterized in that: step two is specifically, after the cushion layer concrete is poured and reaches a certain strength, the bottom plate waterproofing membrane is extended from the edge of the bottom plate and turned up onto the surrounding structure, and the turning-up height is determined according to design requirements.

[0010] The method for treating foundation pit support strip replacement and waterproofing nodes is characterized in that: in step three, the regularly shaped support strip replacement is a rectangular continuous structure, specifically: determining the casting position and height of the support strip replacement, the height of which is the same as the height of the guide wall, using the guide wall as the outer formwork to avoid re-setting the formwork, pouring concrete and vibrating it to form a rectangular regular continuous support strip replacement structure.

[0011] The method for replacing support strips and waterproofing nodes in a foundation pit is characterized in that: Step six specifically comprises: after the concrete of the basement exterior wall is poured and reaches a certain strength, laying waterproof membranes; at the position of replacing the support strips, overlapping the newly laid waterproof membranes with the previously reserved waterproof membranes to ensure that the overlapping joints are tightly sealed; the overlapping length is determined according to the design requirements and is generally not less than the specified minimum overlapping length.

[0012] The method for replacing support strips and waterproofing nodes in a foundation pit is characterized in that: step seven specifically comprises: selecting suitable backfill materials, the backfill materials being low-shrinkage backfill soil or expansive waterproof mortar; backfilling and compacting in layers, with the thickness of each backfill layer determined according to the compaction machinery and the properties of the backfill material; and performing surface leveling after backfilling to the design elevation.

[0013] The beneficial effects of the present invention are: It can be seen from the above technical scheme that the present application provides a method for treating foundation pit support belt replacement and waterproofing nodes, and adopts regularly shaped support belts to replace traditional irregular corbels, which simplifies the construction process of the support belt replacement, avoids the support and dismantling of complex formwork, and improves construction efficiency; the regularly shaped support belts form a more stable connection with the basement exterior wall and the enclosure system, enhancing the stability of the entire structure; the compaction treatment of the backfill material also further improves the tightness between the basement exterior wall and the enclosure system, reducing the risk of structural deformation and settlement.

[0014] By turning up the floor waterproof coiled material on the enclosure structure and making lap joints at the position of the replacement strut belt, a continuous and complete waterproof layer is formed, effectively preventing groundwater seepage and improving the waterproof performance of the basement. Due to the simplification of the construction process, the use of turnover materials such as formwork and scaffolding is reduced, and the material cost is lowered. At the same time, the improvement of construction efficiency also shortens the construction period, reducing labor costs and management costs.

[0015] This application ensures the stability and reliability of construction quality through standardized construction processes and operation key points. The simplified construction process also reduces the risks of high-altitude operations and complex operations, improving construction safety. The present invention is applicable to various geological conditions and foundation pit depths and can be adjusted and optimized according to specific project requirements. Whether it is a new basement or a renovation project of an existing basement, this technical solution can be used to handle the replacement strut belt and waterproof joints of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the drawings and embodiments: Figure 1 It is a schematic structural diagram of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts shall fall within the scope claimed by this application. Embodiment 1 As Figure 1 shown: A method for treating the replacement strut belt and waterproof joints of a foundation pit has the following construction process: (1) After the excavation of the basement soil is completed, pour the concrete for the floor cushion. (2) Construct the floor waterproof coiled material 1 on the cushion. At the same time, note that the waterproof coiled material should be turned up on the enclosure structure instead of on the outside of the floor, and at the same time, reserve the length for the subsequent replacement strut belt and lap joint. (3) After the formwork of the guide wall is removed, pour the concrete for the replacement strut belt 3. In this area, the irregular corbels usually set at intervals are changed to the usually regular-shaped replacement strut belt 3; wooden squares 2 are set at the bottom of the replacement strut belt 3 as needed. (4) After the concrete strength grade of the replacement strut belt reaches the design requirements, cut off the inclined strut steel pipe / section steel 4. (5) Then carry out the construction of the upper structure of the basement until the basement is above plus or minus zero. (6) Construct the waterproof coiled material 5 on the exterior wall of the basement, and at the same time make lap joints at the position of the replacement strut belt. (7) Finally, backfill and compact the fat pocket between the basement exterior wall and the retaining system with backfill material 6.

[0018] Key operation points: (1) The floor waterproofing membrane 1 needs to be turned up on the retaining system instead of on the outside of the floor. This has the advantages of simple operation and high construction efficiency. At the same time, it avoids the need for an additional process of building brick formwork on the outside of the floor, saving a lot of time and labor.

[0019] (2) The casting height of the replacement support belt 3 is the same as the height of the guide wall H. Use the guide wall as the outside formwork, which avoids re-erecting the formwork.

[0020] (3) The replacement support belt 3 is a rectangular regular continuous structure, rather than being independently set like a corbel. This facilitates the lapping of the floor waterproofing membrane 1 and the exterior wall construction waterproofing membrane 5 at the position of the replacement support belt 3, making the entire basement exterior waterproofing form a whole.

[0021] Embodiment 2 1. After the excavation of the basement soil, pour the concrete for the floor cushion.

[0022] Use an excavator for soil excavation to ensure the flatness of the bottom of the foundation pit.

[0023] Pour the floor cushion concrete with a thickness of 100 mm, and the concrete strength grade is C15.

[0024] Use a plate vibrator to vibrate the cushion concrete to ensure the compaction of the concrete.

[0025] 2. Construct the floor waterproofing membrane on the cushion.

[0026] Select an SBS modified bitumen waterproofing membrane with a thickness of 3 mm.

[0027] The waterproofing membrane is turned up on the retaining structure, and the turning-up height is 300 mm, rather than being turned up on the outside of the floor.

[0028] Reserve the length for the subsequent replacement support belt and lapping to ensure that the waterproofing membrane has sufficient lapping length.

[0029] Use the hot melt method to paste the waterproofing membrane to ensure the bonding strength of the waterproof layer.

[0030] 3. Demolish the guide wall formwork and pour the concrete for the replacement support belt The replacement support belt is designed as a rectangular continuous structure, and its height is the same as the height of the guide wall (for example, 300 mm).

[0031] Use the guide wall as the outside formwork to avoid re-erecting the formwork.

[0032] The concrete strength grade of the replacement strut belt is C30 to ensure the bearing capacity and structural stability.

[0033] During the pouring process, vibration points are set and internal vibrators are used for vibration to ensure the compaction of the concrete.

[0034] 4. After the concrete strength grade of the replacement strut belt reaches the design requirements, cut off the inclined strut steel pipe or section steel.

[0035] Use a chop saw or gas cutting equipment to cut off the inclined strut steel pipe / section steel.

[0036] Ensure the stability of the foundation pit retaining structure after cutting, and carry out temporary support reinforcement if necessary.

[0037] 5. Carry out the construction of the upper structure of the basement until the basement reaches ±0.

[0038] Construct the basement floor slab, side walls and roof according to the design requirements.

[0039] Ensure the structural safety and construction quality during the construction process.

[0040] 6. Construct waterproof coiled materials on the exterior wall of the basement, and carry out lap treatment at the position of the replacement strut belt.

[0041] Select SBS modified bitumen waterproof coiled materials with a thickness of 3 mm.

[0042] The waterproof coiled materials are lapped at the position of the replacement strut belt, and the lap length is not less than 100 mm.

[0043] Use sealant to seal the lap joint to ensure the tightness of the waterproof layer.

[0044] After the construction of the waterproof coiled materials is completed, construct the protective layer with a thickness of 20 mm.

[0045] 7. Finally, backfill and compact the fat pocket between the exterior wall of the basement and the retaining system with backfill materials.

[0046] Select low-shrinkage backfill soil or expansive waterproof mortar as the backfill material.

[0047] Backfill in layers, with each layer thickness not exceeding 300 mm.

[0048] Use a plate vibrator to compact the backfill materials to ensure the compactness and waterproof performance after backfilling.

[0049] The above embodiments simplify the structural form, facilitate construction and waterproof treatment, avoid weak points of the waterproof layer caused by irregular structures, simplify the construction process by adjusting the up-turned position and lapping treatment of the waterproof coiled material, improve the construction efficiency, ensure the continuity and integrity of the waterproof layer, reduce unnecessary construction processes, save construction time and labor costs, reduce the construction cost, and ensure the safety and stability of the foundation pit retaining structure through reasonable design of the replacement support belt and selection of concrete strength grade.

[0050] The above are only the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method for dealing with the replacement support belt and waterproof joint of a foundation pit, characterized in that The steps include: Step 1: After the basement excavation is completed, pour the bottom slab concrete; Step 2: construct the baseboard waterproof membrane on the cushion layer, and turn the waterproof membrane up on the enclosure structure, and reserve the length for subsequent replacement of the support belt and overlap; Step 3: After the guide wall formwork is removed, pour the regular-shaped support strip concrete; Step 4: After the concrete strength grade of the replacement support belt reaches the design requirements, cut off the diagonal support steel pipe or steel; Step 5: Carry out the construction of the basement superstructure until the basement reaches zero; Step 6: Install waterproof membrane on the exterior wall of the basement and perform overlap treatment at the location where the support strips are replaced; Step 7: Finally, backfill and compact the fertilizer trough between the basement outer wall and the enclosure system with backfill materials.

2. The foundation pit replacement strut and waterproof joint treatment method according to claim 1, characterized in that: Step 2 specifically involves extending the base plate waterproofing membrane from the edge of the base plate and folding it up onto the retaining structure after the cushion layer concrete is poured and reaches a certain strength. The folding height is determined according to the design requirements.

3. A foundation pit replacement strut belt and waterproof joint treatment method according to claim 1, characterized in that: In step three, the regularly shaped replacement support belt is a rectangular continuous structure, specifically: determine the casting position and height of the replacement support belt, whose height is the same as the height of the guide wall, use the guide wall as the outer formwork to avoid re-setting the formwork, pour concrete and vibrate it to form a rectangular regular continuous replacement support belt structure.

4. A foundation pit replacement support belt and waterproof joint treatment method according to claim 1, characterized in that: Step six is as follows: After the concrete of the basement exterior wall is poured and reaches a certain strength, the waterproof membrane is laid; at the position where the support strip is replaced, the newly laid waterproof membrane is overlapped with the previously reserved waterproof membrane to ensure that the overlap is tightly sealed; the overlap length is determined according to the design requirements and is generally not less than the specified minimum overlap length.

5. A foundation pit replacement support belt and waterproof joint treatment method according to claim 1, characterized in that: Step seven is as follows: select appropriate backfill material, which should be low-shrinkage backfill soil or expansive waterproof mortar; backfill and compact in layers, with the thickness of each layer determined according to the compaction machinery and the properties of the backfill material; after backfilling to the design elevation, perform surface leveling.

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