A pre-paved bottom plate assembled side wall waterproof structure and a construction process thereof

Abstract

The application discloses a kind of pre-paved bottom plate assembled side wall waterproof structure and its construction technology, including bottom plate cushion layer and assembled side wall, the bottom plate cushion layer is equipped with waterproof layer one, the bottom plate is poured on the waterproof layer, the bottom plate is filled with concrete structure between assembled side wall, the assembled side wall and bottom plate are connected by flinging joint, the joint part of assembled side wall is equipped with waterproof layer two.The application can close bottom plate and side wall joint leakage water channel.The bottom plate and assembled side wall exist assembling joint, the joint is rigid joint, it is difficult to achieve the purpose of effectively preventing leakage by traditional water stop measures, the application closes the joint from water side, prevents water from entering joint, reduces the risk of leakage, improves the overall waterproof effect of assembled station.

Description

Technical Field

[0001] This invention relates to the field of underground waterproofing in building engineering, specifically to a pre-laid base plate assembled side wall waterproofing structure and its construction process. Background Technology

[0002] In recent years, prefabricated buildings have gradually increased their proportion not only in civil construction but also in underground engineering. Prefabricated subway stations have also gradually emerged in the rail transit sector.

[0003] In the field of rail transit, since most of the projects under construction are located below the groundwater level, the waterproofing requirements are high, especially for subway stations. According to the "General Specification for Waterproofing of Building and Municipal Engineering" GB55030-2022 and the "Technical Specification for Waterproofing of Underground Engineering" GB50108-2008, the waterproofing level is Grade I, which puts forward higher requirements for the waterproofing design of stations.

[0004] According to regulations, subway stations constructed on-site require two layers of external waterproofing, using a combination of waterproof membrane and waterproof coating. However, in prefabricated subway stations, due to construction limitations, a method similar to the assembly and compression of tunnel segments is often used. This involves installing EPDM rubber gaskets at the joints and reserving grouting pipes between the joints for later grouting, without an external waterproofing layer on the station's outer contour. This approach, relying 100% on joint waterproofing, is somewhat inadequate for the primary waterproofing requirements of underground stations. If the joint waterproofing fails, it will lead to water leakage in the station, affecting operational safety. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-laid base plate assembled side wall waterproof structure and its construction process to solve the technical problem of poor waterproof effect in underground stations in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a pre-laid base plate assembled side wall waterproof structure, including a base plate cushion layer and an assembled side wall. A first waterproof layer is provided on the base plate cushion layer, and a base plate is poured on top of the waterproof layer. A concrete structure is filled between the base plate and the assembled side wall. The assembled side wall and the base plate are connected by a joint. A second waterproof layer is provided at the joint of the assembled side wall.

[0008] Furthermore, the first waterproof layer comprises a polyurethane waterproof coating base layer, a reinforcing material layer, a polyurethane waterproof coating top layer, and a pre-laid reactive fabric. The polyurethane waterproof coating base layer, the reinforcing material layer, the polyurethane waterproof coating top layer, and the pre-laid reactive fabric are sequentially arranged above the base slab cushion layer.

[0009] Furthermore, the second waterproof layer includes a second polyurethane waterproof coating base layer, a second reinforcing material layer, and a second polyurethane waterproof coating top layer.

[0010] Furthermore, the base plate is also provided with an adhesive layer, which is a waterproof coating adhesive layer or a primer layer.

[0011] A construction process for a pre-laid base slab assembled sidewall waterproof structure includes the following steps:

[0012] S1. Precast pre-laid base plate with interlocking joints;

[0013] S2, Prefabricated side wall joints;

[0014] S1 specifically includes the following steps:

[0015] S11. After inspecting and cleaning the base slab, apply a base coat of polyurethane waterproof coating to the surface of the base slab.

[0016] S12. Immediately lay a high-permeability reinforcing material layer on top of the polyurethane waterproof coating, ensuring the layer is laid flat and straight.

[0017] S13. After the polyurethane waterproof coating bottom layer has completely soaked and dried and cured the reinforcing material layer, apply a layer of polyurethane waterproof coating top layer to the surface of the reinforcing material layer.

[0018] S14. Immediately lay the pre-laid reactive fabric on the top layer of polyurethane waterproof coating. Lay it flat and straight. After the top layer of polyurethane waterproof coating is completely dry, pour the cast-in-place subway base slab 300mm away from the surface of the pre-laid reactive fabric and the enclosure structure.

[0019] S15. A temporary protective layer is applied to the surface of the pre-laid reactive fabric for protection;

[0020] S2 specifically includes the following steps:

[0021] S21. After removing and cleaning the temporary protective layer on the surface of the pre-laid reactive fabric, apply a layer of polyurethane waterproof coating primer to the surface of the pre-laid reactive fabric and extend it up to 300mm from the prefabricated side wall.

[0022] S22. Immediately lay the second layer of high-permeability reinforcing material on the second layer of polyurethane waterproof coating, and extend it up to 300mm from the prefabricated side wall, laying it flat and straight.

[0023] S23. After the second layer of polyurethane waterproof coating has thoroughly soaked and dried the second layer of reinforcing material and cured completely, apply a second layer of polyurethane waterproof coating to the surface of the second layer of reinforcing material.

[0024] S24. After the second layer of polyurethane waterproof coating has completely dried and cured, backfill with concrete.

[0025] Furthermore, the thickness of the first waterproof layer is 1.5mm-2.0mm±0.1mm, the thickness of the second waterproof layer is 1.5mm±0.1mm, and the filling height of the concrete material during backfilling is more than 100mm above the joint of the prefabricated side wall.

[0026] Furthermore, the polyurethane waterproof coating primer layer 1, polyurethane waterproof coating top layer 1, polyurethane waterproof coating primer layer 2, and polyurethane waterproof coating top layer 2 are single-component high-strength, high-elongation polyurethane waterproof coatings. They are applied by spraying or scraping, with a thickness of 0.6mm ± 0.1mm. The single-component high-strength, high-elongation polyurethane waterproof coating has a solid content ≥90%, tensile strength (MPa) ≥14, elongation at break (%) ≥870, tear strength (N / mm) ≥59, 80℃ / 7d heat aging strength retention rate / % ≥110, surface drying time (23℃, 50%RH) / h ≤4h, and adhesion strength to concrete substrate / MPa ≥3.5.

[0027] Furthermore, the first and second layers of the tire body reinforcement material are 30-50g / ㎡ PE+PET bicomponent calendered nonwoven fabric.

[0028] Furthermore, the pre-laid reactive fabric is a 100-200g / ㎡ PET polyester nonwoven fabric.

[0029] Furthermore, the concrete material is soil mixed with cement or other materials and solidified, with a strength of 3.0 MPa and a permeability grade of 0.6 MPa or higher.

[0030] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0031] (1) The pre-laid base plate assembled side wall waterproof structure provided by the present invention can seal the leakage channel at the joint between the base plate and the side wall. There is an assembly joint between the base plate and the assembled side wall. This joint is a rigid joint, and it is difficult to achieve the purpose of effectively preventing leakage by relying on traditional water-stopping measures.

[0032] (2) The pre-laid base plate assembled side wall waterproof structure provided by the present invention seals the joint from the water-facing side, prevents water from entering the joint, reduces the risk of water leakage, and improves the overall waterproof effect of the prefabricated station. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0035] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0036] In the diagram: 1. Base slab; 2. Waterproof layer one; 2-1. Polyurethane waterproof coating base layer one; 2-2. Reinforcing material layer one; 2-3. Polyurethane waterproof coating top layer one; 2-4. Pre-laid reactive fabric; 3. Base slab; 4. Adhesive layer; 5. Waterproof layer two; 5-1. Polyurethane waterproof coating base layer two; 5-2. Reinforcing material layer two; 5-3. Polyurethane waterproof coating top layer two; 6. Prefabricated side wall; 7. Concrete structure. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] like Figure 1-2As shown, the present invention provides a pre-laid base plate assembled side wall waterproof structure, including a base plate cushion layer and an assembled side wall. A first waterproof layer is provided on the base plate cushion layer, and a base plate is poured on top of the waterproof layer. A concrete structure is filled between the base plate and the assembled side wall. The assembled side wall and the base plate are connected by a splice joint. A second waterproof layer is provided at the splice joint of the assembled side wall.

[0040] The waterproof layer comprises a polyurethane waterproof coating base layer, a reinforcing material layer, a polyurethane waterproof coating top layer, and a pre-laid reactive fabric. The polyurethane waterproof coating base layer, the reinforcing material layer, the polyurethane waterproof coating top layer, and the pre-laid reactive fabric are sequentially arranged above the base slab cushion layer.

[0041] The second waterproof layer includes a second layer of polyurethane waterproof coating base layer, a second layer of reinforcing material, and a second layer of polyurethane waterproof coating top layer.

[0042] The thickness of the waterproof layer is 1.5mm-2.0mm±0.1mm.

[0043] The thickness of the second waterproof layer is 1.5mm ± 0.1mm.

[0044] The concrete filling height between the base slab and the prefabricated sidewalls is at least 100mm above the joint of the prefabricated sidewalls.

[0045] The base plate is also provided with a waterproof coating adhesive layer or a base coating layer.

[0046] Example 1

[0047] Precast pre-laid base slab jointing:

[0048] Step 1: Inspect and clean the base plate layer 1.

[0049] Step 2: Apply a layer of high-strength, high-elongation polyurethane waterproof coating primer 2-1 to the entire surface of the base slab pad layer 1.

[0050] Step 3: After the high-strength, high-elongation polyurethane waterproof coating base layer 2-1 is completed, immediately lay the high-permeability reinforcing material layer 2-2, laying it flat and straight.

[0051] Step 4: After the high-strength, high-elongation polyurethane waterproof coating primer layer 2-1 has thoroughly impregnated the high-permeability reinforcing material layer 2-2 and is completely dry and cured, apply a coat of high-strength, high-elongation polyurethane waterproof coating top layer 2-3 onto the surface of the high-permeability reinforcing material layer 2-2. The reinforcing material layer 2-2 is a 30-50 g / m² PE+PET two-component calendered nonwoven fabric.

[0052] Step 5: After completing the application of the high-strength, high-elongation polyurethane waterproof coating layer 2-3, immediately lay the pre-laid reactive fabric 2-4, ensuring it is laid flat and straight. The final thickness of the waterproof layer 2 is 1.5mm-2.0mm ± 0.1mm. The pre-laid reactive fabric 2-4 is a 100-200g / ㎡ PET polyester non-woven fabric.

[0053] Step Six: After the high-strength, high-elongation polyurethane waterproof coating layer 2-3 has been completely dried, pour the cast-in-place subway base slab 3 on the surface of the pre-laid reactive fabric 2-4, 300mm away from the enclosure structure.

[0054] Step 7: Apply a temporary protective layer to the surface of the pre-laid reactive fabric 2-4.

[0055] Prefabricated side wall joints:

[0056] Step 1: Remove the temporary protective layer at the joint of the prefabricated base plate and clean the surface of the prefabricated reaction cloth 2-4.

[0057] Step 2: Apply a layer of high-strength, high-elongation polyurethane waterproof coating primer 25-1 to the surface of the pre-laid reactive fabric 2-4, and extend it up to 300mm onto the prefabricated side wall.

[0058] Step 3: After completing the application of the high-strength, high-elongation polyurethane waterproof coating base layer 2 (5-1), immediately lay the high-permeability reinforcing material layer 2 (5-2), extending it up 300mm to the prefabricated side wall, ensuring it is laid flat and straight. The reinforcing material layer 2 (5-2) is a 30-50g / ㎡ PE+PET two-component calendered nonwoven fabric.

[0059] Step 4: After the high-strength, high-elongation polyurethane waterproof coating base layer 2 (5-1) has thoroughly impregnated the high-permeability reinforcing material layer 2 (5-2) and is completely dry and cured, apply a layer of high-strength, high-elongation polyurethane waterproof coating top layer 2 (5-3) on the surface of the high-permeability reinforcing material layer 2 (5-2). The final thickness of the waterproof layer 2 for the assembled side wall joint is 1.5mm ± 0.1mm.

[0060] Step 5: After the high-strength, high-elongation polyurethane waterproof coating layer 2 (5-3) has completely dried and cured, backfill with high-strength, high-impermeability cement grout 7. The backfill height should be at least 100mm above the joint of the prefabricated side wall.

[0061] The single-component high-strength, high-elongation polyurethane waterproof coating used has a solid content of ≥90%, tensile strength (MPa) ≥14, elongation at break (%) ≥870, tear strength (N / mm) ≥59, 80℃ / 7d heat aging strength retention rate / % ≥110, surface drying time (23℃, 50%RH) / h ≤4h, and adhesion strength to concrete substrate / MPa ≥3.5.

[0062] The polyurethane waterproof coating base layer 1 2-1, polyurethane waterproof coating top layer 1 2-3, and polyurethane waterproof coating base layer 2 5-1 and polyurethane waterproof coating top layer 2 5-3 are applied by spraying or scraping, with a thickness of 0.6mm ± 0.1mm, and the base layer and top layer are applied at a 90° perpendicular direction.

[0063] The structures, functions, and connection forms disclosed herein can be implemented in other ways. For example, the embodiments described above are merely illustrative; multiple components may be combined or integrated into another component. Furthermore, the functional components in the various embodiments herein may be integrated into one functional component, or each functional component may exist physically separately, or two or more functional components may be integrated into one functional component.

Claims

1. A pre-laid base slab assembled sidewall waterproof structure, characterized in that, The system includes a base slab (1) and prefabricated sidewalls (6). A first waterproof layer (2) is provided on the base slab (1). A base slab (3) is poured above the first waterproof layer (2). A concrete structure (7) is filled between the base slab (3) and the prefabricated sidewalls (6). The prefabricated sidewalls (6) and the base slab (3) are connected by a splice joint. A second waterproof layer (5) is provided at the joint of the prefabricated sidewalls (6). After the second waterproof layer (5) has completely dried and cured, it is backfilled with concrete. When backfilling, the filling height is more than 100mm above the joint of the prefabricated side wall (6); the first waterproof layer (2) includes the first layer of polyurethane waterproof coating (2-1), the first layer of reinforcing material (2-2), the first layer of polyurethane waterproof coating (2-3), and the pre-laid reactive cloth (2-4); the second waterproof layer (5) includes the second layer of polyurethane waterproof coating (5-1), the second layer of reinforcing material (5-2), and the second layer of polyurethane waterproof coating (5-3); the base plate (3) is also provided with an adhesive layer (4).

2. A construction process for a pre-laid base slab assembled sidewall waterproof structure, based on the pre-laid base slab assembled sidewall waterproof structure as described in claim 1, characterized in that, Includes the following steps: S1. Precast pre-laid base plate with interlocking joints; S2, Prefabricated side wall joints; S1 specifically includes the following steps: S11. After inspecting and cleaning the base slab, apply a base coat of polyurethane waterproof coating to the surface of the base slab. S12. Immediately lay the high-permeability reinforcing material layer 1 (2-2) on the polyurethane waterproof coating base layer 1 (2-1), laying it flat and straight; S13. After the polyurethane waterproof coating base layer (2-1) has penetrated the reinforcing material layer (2-2) and is completely dry and cured, apply a layer of polyurethane waterproof coating top layer (2-3) on the surface of the reinforcing material layer (2-2). S14. Immediately lay the pre-laid reactive cloth (2-4) on the upper layer (2-3) of the polyurethane waterproof coating. Lay it flat and straight. After the upper layer (2-3) of the polyurethane waterproof coating is completely dry, pour the base plate (3) on the surface of the pre-laid reactive cloth (2-4). S15. A temporary protective layer is applied to the surface of the pre-laid reactive fabric (2-4) for protection; S2 specifically includes the following steps: S21. After removing and cleaning the temporary protective layer on the surface of the pre-laid reactive fabric (2-4), apply a layer of polyurethane waterproof coating primer 2 (5-1) to the surface of the pre-laid reactive fabric (2-4) and extend it up to 300mm from the prefabricated side wall. S22. Immediately lay the second layer of high-permeability reinforcing material (5-2) on the second layer of polyurethane waterproof coating (5-1), and extend it up to 300mm from the prefabricated side wall, laying it flat and straight. S23. After the second layer of polyurethane waterproof coating (5-1) has penetrated the second layer of reinforcing material (5-2) and is completely dry and cured, apply a layer of the second layer of polyurethane waterproof coating (5-3) on the surface of the second layer of reinforcing material (5-2). S24. After the second layer (53) of polyurethane waterproof coating has completely dried and cured, backfill with concrete.

3. The construction process of the pre-laid base slab assembled sidewall waterproof structure according to claim 2, characterized in that, The thickness of the first waterproof layer (2) is 1.5mm-2.0mm±0.1mm, and the thickness of the second waterproof layer (5) is 1.5mm±0.1mm.

4. The construction process of the pre-laid base plate assembled sidewall waterproof structure according to claim 2, characterized in that, The polyurethane waterproof coating base layer 1 (2-1), polyurethane waterproof coating top layer 1 (2-3), polyurethane waterproof coating base layer 2 (5-1), and polyurethane waterproof coating top layer 2 (5-3) are single-component high-strength and high-elongation polyurethane waterproof coatings. They are applied by spraying or scraping, and the thickness is 0.6mm ± 0.1mm.

5. The construction process of the pre-laid base slab assembled sidewall waterproof structure according to claim 2, characterized in that, The first layer (2-2) and the second layer (5-2) of the body reinforcement material are 30-50g / ㎡ PE+PET bicomponent calendered nonwoven fabric.

6. The construction process of the pre-laid base slab assembled sidewall waterproof structure according to claim 2, characterized in that, The pre-laid reactive fabric (2-4) is a 100-200g / ㎡ PET polyester nonwoven fabric.

7. The construction process of the pre-laid base slab assembled sidewall waterproof structure according to claim 2, characterized in that, The concrete material is soil mixed with cement or other materials and solidified, with a strength of 3.0 MPa and a permeability grade of 0.6 MPa or higher.

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