Construction method of underground space composite waterproof structure

Abstract

The invention discloses a construction method of an underground space composite waterproof structure, and relates to the technical field of urban underground space waterproof construction. The construction method comprises the steps that a plurality of water-swelling waterstops are arranged on the outer vertical face of the existing outer wall; a composite waterproof layer connected together is constructed on the outer vertical face of the existing outer wall and the surface of the newly-built bottom plate cushion layer, the composite waterproof layer protrudes outwards at the position of each water swelling waterstop, and protruding parts for containing the water swelling waterstops are formed; and a newly-built bottom plate is cast in situ above the newly-built bottom plate cushion layer, a newly-built outer wall is cast in situ on the side, close to the existing outer wall, of the newly-built bottom plate cushion layer, the newly-built outer wall is tightly attached to the composite waterproof layer on the existing outer wall, and the protruding part is embedded in the newly-built outer wall. The continuity and integrity of the waterproof structure can be guaranteed, the risk that underground water permeates into the underground space is reduced, and the problem that the waterproof structure fails due to the fact that continuity and integrity of a waterproof layer are difficult to guarantee in a narrow space through traditional waterproof construction is solved.

Description

Technical Field

[0001] The present application relates to the technical field of urban underground space waterproofing construction, and specifically to a construction method of an underground space composite waterproofing structure. Background Art

[0002] With the acceleration of urbanization, available urban land resources are becoming increasingly scarce. The development and utilization of underground space has become a crucial means of expanding urban functions. Underground space development encompasses not only infrastructure such as underground parking lots, subway stations, commercial facilities, and civil air defense projects, but also emerging facilities like underground utility corridors and underground data centers. Underground space development faces numerous challenges. Groundwater infiltration can cause structural damage, equipment failure, limited functionality, and even pose safety risks. Therefore, the waterproofing of underground space is a key factor affecting its proper use and structural safety.

[0003] Traditional underground waterproofing construction methods, such as using external waterproof membranes or waterproof coatings to form a waterproof layer, usually require a large operating space during construction to ensure the continuity and integrity of the waterproof layer. However, in the context of intensive development of urban underground spaces, the distance between new underground spaces and existing underground spaces has gradually narrowed, even approaching zero distance. Under these special working conditions, due to the extremely narrow operating space, it is difficult for construction workers to effectively lay the waterproof layer, and the continuity and integrity of the waterproof layer are difficult to ensure. In particular, the bottom plate waterproofing and the vertical waterproofing cannot be connected as a whole, resulting in the waterproof structure being easily ineffective at the joints. Groundwater can easily penetrate into the underground space through the joints, seriously affecting the normal use function and structural safety of the underground space. Summary of the Invention

[0004] The purpose of this application is to provide a construction method for a composite waterproof structure of an underground space, so as to solve the problem that the waterproof structure is prone to failure when the new underground space and the existing underground space are at nearly zero distance.

[0005] The technical solution adopted by this application to solve its technical problems is: A construction method for an underground space composite waterproof structure, comprising: A plurality of horizontally arranged water-expandable waterstops are arranged at vertical intervals on the exterior surface of the existing exterior wall; A composite waterproof layer is constructed and connected on the facade of the existing exterior wall and the surface of the newly built base slab, wherein the composite waterproof layer protrudes outward at the position of each water-swelling waterstop and forms a protrusion to accommodate the water-swelling waterstop; A new base plate is cast on top of the new base plate cushion layer, and a new exterior wall is cast on the side of the new base plate cushion layer close to the existing exterior wall. The new exterior wall is closely attached to the composite waterproof layer on the existing exterior wall, and the protrusion is pre-buried in the new exterior wall.

[0006] Furthermore, the construction method of the composite waterproof layer includes: First, a non-curing rubber asphalt waterproof coating layer is constructed on the facade of the existing exterior wall and the surface of the newly built base plate cushion, and then a double-sided reactive bonding polymer waterproof membrane layer is constructed on the non-curing rubber asphalt waterproof coating layer.

[0007] Furthermore, the protrusion is a dovetail groove structure.

[0008] Furthermore, along the direction perpendicular to the exterior facade of the existing exterior wall, the size of the composite waterproof layer on the newly built base plate cushion is greater than 2000 mm.

[0009] Furthermore, it also includes: constructing a caulking sealing structure between the top of the newly built exterior wall and the exterior facade of the existing exterior wall.

[0010] Furthermore, the construction method of the caulking sealing structure includes: First, non-curing rubber asphalt is embedded in the top of the gap between the newly built exterior wall and the existing exterior wall, and then waterproof and crack-resistant mortar is poured between the upper end surface of the newly built exterior wall and the facade of the existing exterior wall.

[0011] Furthermore, there is a transition portion between the surface of the newly built base plate cushion and the facade of the existing exterior wall.

[0012] Furthermore, when the newly built base plate is cast, embedded steel bars connected to the existing exterior wall are pre-buried in the newly built base plate. Furthermore, one of the protrusions faces the newly built base plate.

[0013] Furthermore, when there is a construction joint on the newly built exterior wall, a waterstop steel plate is provided at the construction joint.

[0014] Beneficial effects of this application: 1. The construction method of the underground space composite waterproof structure provided in the embodiment of the present application adopts the method of first constructing the waterproof structure and then constructing the new underground space. It not only provides sufficient operating space for the construction of the waterproof structure within the nearly zero distance between the new underground space and the existing underground space, but also realizes the connection of the bottom plate waterproofing and the vertical waterproofing into a whole, ensures the continuity and integrity of the waterproof structure, reduces the risk of groundwater infiltration into the underground space, and solves the problem that traditional waterproof construction is difficult to ensure the continuity and integrity of the waterproof layer in a narrow space, resulting in failure of the waterproof structure.

[0015] 2. The construction method of the underground space composite waterproof structure provided in the embodiment of the present application utilizes the composite waterproof layer to form an integral anti-seepage wall between the newly built exterior wall and the existing exterior wall, and utilizes the water-swelling waterstop and the protruding portion of the composite waterproof layer to form an emergency anti-seepage waterstop barrier; when the groundwater level changes and the water pressure breaks through the composite waterproof layer between the newly built exterior wall and the existing exterior wall, the water-swelling waterstop and the protruding portion of the waterstop are used to form a waterstop structure in time to achieve an emergency waterstop effect, and the cooperation of multiple water-swelling waterstops and protruding portions can form a multi-level emergency anti-seepage waterstop barrier to effectively cut off and separate the seepage channel; this composite waterproof structure can significantly enhance the anti-seepage performance of the underground space and reduce the maintenance costs and safety hazards caused by leakage problems.

[0016] 3. The construction method of the underground space composite waterproof structure provided by the embodiment of the present application, when constructing the composite waterproof layer, the non-curing rubber asphalt waterproof coating layer is first constructed, which serves as the adhesive and water seepage channel blocking material of the double-sided reaction bonding type polymer waterproof membrane layer, thereby realizing the first anti-seepage barrier of the overall fusion of the new underground space floor to the existing underground space structure outer wall; the double-sided reaction bonding type polymer waterproof membrane layer is then constructed, which serves as the protective outer coat of the non-curing rubber asphalt waterproof coating layer, thereby realizing the second anti-seepage barrier of the overall fusion of the new underground space floor to the existing underground space structure outer wall; the two anti-seepage barriers not only seamlessly integrate the waterproofing between the new and old structures, but also close the water seepage channel. The double-sided reaction bonding type polymer waterproof membrane layer also has the effects of self-adhesion and self-healing through chemical reaction with concrete, thereby forming a molecular group connection after the concrete of the new underground space is poured, realizing a close connection between the composite waterproof layer and the new underground space structure, and improving the anti-seepage performance of the new underground space. 4. In the construction method of the underground space composite waterproof structure provided by the embodiment of the present application, the non-curing rubber asphalt waterproof coating layer is both a waterproof coating and an adhesive for the roll material. The construction operation is simple and does not depend on the operating level of skilled workers. In addition, during the construction of the double-sided reactive adhesive polymer waterproof roll material layer, there is no need to use a torch to bake the roll material, thereby avoiding secondary damage to the roll material. The two anti-seepage barriers formed by the non-curing rubber asphalt waterproof coating layer and the double-sided reactive adhesive polymer waterproof roll material layer have self-healing properties, thereby greatly improving the anti-seepage performance.

[0017] 5. The construction method of the underground space composite waterproof structure provided in the embodiment of the present application constructs a caulking sealing structure between the top of the newly built exterior wall and the facade of the existing exterior wall to seal the top of the gap between the newly built exterior wall and the existing exterior wall, thereby reducing the rate at which the composite waterproof layer is oxidized due to contact with the outside air and increasing the service life of the composite waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application 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 creative work.

[0019] Figure 1 is a schematic diagram of an underground space composite waterproof structure provided in an embodiment of the present application; Figure 2 yes Figure 1 Enlarged view of part A in the middle; Figure 3 yes Figure 1 Enlarged view of middle part B; Figure 4 yes Figure 1 Enlarged view of middle C part; Figure 5 yes Figure 1 Enlarged view of part D in the middle.

[0020] Reference numerals: 10-Existing exterior walls; 101-Existing exterior wall waterproofing membrane; 11-Water-expanding waterstop; 12-Build new base slab; 13-composite waterproof layer; 131- non-curing rubber asphalt waterproof coating layer; 132-Double-sided reactive adhesive polymer waterproof membrane layer; 14- protrusion; 15-Build a new base plate; 16-new exterior wall; 161-construction joint; 17-caulking sealing structure; 171-Non-cured rubber asphalt; 172- waterproof and crack-resistant mortar; 18- Transitional section; 19-Rebar planting; 20-Waterstop steel plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0022] In the description of this application, the terms "upper," "lower," "left," "right," "front," "back," "inner," and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned orientational descriptions may be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are met.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The present invention provides a method for constructing an underground composite waterproof structure, comprising the following steps: S1. A plurality of horizontally arranged water-expandable waterstops 11 are vertically spaced apart on the exterior surface of an existing exterior wall 10.

[0025] See also Figure 1 The right side of the existing exterior wall 10 is the interior of the existing underground space, and the right side of the existing exterior wall 10 is the interior facade of the existing exterior wall 10. The left side of the existing exterior wall 10 is the exterior of the existing underground space and the location of the new underground space. The left side of the existing exterior wall 10 is the exterior facade of the existing exterior wall 10. The exterior facade of the existing exterior wall 10 is constructed with the existing exterior wall waterproofing membrane 101.

[0026] Specifically, a water-swelling waterstop 11 is constructed on the exterior facade of the existing exterior wall 10, specifically, on the exterior wall waterproofing membrane 101. Several water-swelling waterstops 11 are spaced apart from one another from top to bottom, each horizontally extending from one side of the exterior wall waterproofing membrane 101 to the other. During construction, the water-swelling waterstops 11 can be secured using either adhesive or steel nails.

[0027] S2. A composite waterproof layer 13 is constructed and connected to the exterior facade of the existing exterior wall 10 and the surface of the newly built base slab cushion layer 12. The composite waterproof layer 13 protrudes outward at the position of each water-swelling waterstop 11 and forms a protrusion 14 to accommodate the water-swelling waterstop 11.

[0028] See also Figure 1 The newly built base slab cushion layer 12 is set on the left side of the existing exterior wall 10, and the right side of the newly built base slab cushion layer 12 contacts the left side of the existing exterior wall 10. Specifically, the composite waterproof layer 13 is constructed and connected on the exterior wall waterproofing membrane 101 of the existing exterior wall 10 and the surface of the newly built base slab cushion layer 12, which can connect the horizontal base slab waterproofing and the vertical waterproofing into a whole, avoiding gaps between the two and causing water seepage.

[0029] Since a water-swelling waterstop 11 is constructed on the exterior wall waterproofing membrane 101, when the composite waterproof layer 13 is constructed on the exterior wall waterproofing membrane 101, the composite waterproof layer 13 can be made to protrude outward at the position of each water-swelling waterstop 11 to form a protrusion 14. This not only avoids the water-swelling waterstop 11, but also forms a space to accommodate the water-swelling waterstop 11, and at the same time protects the water-swelling waterstop 11 therein, thereby preventing the water-swelling waterstop 11 from swelling when the concrete is subsequently poured, thereby affecting its water-stopping performance.

[0030] S3. Cast a new base plate 15 on top of the new base plate cushion layer 12, and cast a new exterior wall 16 on the side of the new base plate cushion layer 12 close to the existing exterior wall 10. The new exterior wall 16 is closely attached to the composite waterproof layer 13 on the existing exterior wall 10, and the protrusion 14 is pre-buried in the new exterior wall 16.

[0031] Specifically, formwork is erected at the floor and exterior walls of the new underground space, and concrete is poured in-situ to form the new floor 15 and new exterior wall 16. The new exterior wall 16 is closely attached to the composite waterproof layer 13 on the existing exterior wall 10, thereby forming a single, integral anti-seepage barrier between the new exterior wall 16 and the existing exterior wall 10. Because the protrusion 14 projects toward the new exterior wall 16, it is embedded within the new exterior wall 16 after the new exterior wall 16 is cast, ensuring a tight and secure connection between the protrusion 14 and the new exterior wall 16.

[0032] The construction method of the underground space composite waterproof structure provided in the embodiment of the present application adopts the method of first constructing the waterproof structure and then constructing the new underground space. It not only provides sufficient operating space for the construction of the waterproof structure within the nearly zero distance between the new underground space and the existing underground space, but also realizes the connection of the bottom plate waterproofing and the vertical waterproofing into a whole, ensures the continuity and integrity of the waterproof structure, reduces the risk of groundwater infiltration into the underground space, and solves the problem that traditional waterproof construction is difficult to ensure the continuity and integrity of the waterproof layer in a small space, resulting in failure of the waterproof structure.

[0033] The present application utilizes a composite waterproof layer 13 to form an integral anti-seepage wall between the newly built exterior wall 16 and the existing exterior wall 10, and utilizes a water-swelling waterstop 11 and a protrusion 14 of the composite waterproof layer 13 to form an emergency anti-seepage water-stopping barrier; when the groundwater level changes and the water pressure breaks through the composite waterproof layer 13 between the newly built exterior wall 16 and the existing exterior wall 10, the water-swelling waterstop 11 can promptly form a water-stopping structure with the protrusion 14 to achieve an emergency water-stopping effect, and the cooperation of multiple water-swelling waterstops 11 and the protrusion 14 can form a multi-level emergency anti-seepage water-stopping barrier to effectively cut off and separate the seepage channel; this composite waterproof structure can significantly enhance the anti-seepage performance of the underground space and reduce the maintenance costs and safety hazards caused by leakage problems.

[0034] In some embodiments, along a direction perpendicular to the exterior facade of the existing exterior wall 10 , the size of the composite waterproof layer 13 on the newly-built base plate cushion 12 is greater than 2000 mm.

[0035] Accordingly, this size enables the composite waterproof layer 13 to cover a wider area on the newly built base plate cushion layer 12, ensuring that the composite waterproof layer 13 forms a more reliable waterproof seal at the connection between the newly built base plate cushion layer 12 and the existing exterior wall 10, not only preventing groundwater from seeping through the gap between the newly built base plate 15 and the existing exterior wall 10, but also effectively preventing groundwater from seeping under the newly built base plate 15.

[0036] In some embodiments, see Figure 1 、 Figure 3 、 Figure 4 During construction, the cross-sectional shape of the water-swelling waterstop 11 can be set to an isosceles trapezoid, and the short bottom side of the water-swelling waterstop 11 can be brought into contact with the exterior wall waterproofing membrane 101 on the existing exterior wall 10. Then, the composite waterproof layer 13 is constructed on the outer surface of the water-swelling waterstop 11 to form the dovetail groove-shaped protrusion 14.

[0037] Accordingly, by setting the protrusion 14 to a dovetail groove structure, it can be better tightly combined with the water-swelling waterstop 11. The water-swelling waterstop 11 will swell after contacting water, and the protrusion 14 with a dovetail groove structure can provide more stable support and wrapping for the swollen waterstop 11, so that the water-swelling waterstop 11 can more tightly fill the gap between the protrusion 14 and the existing exterior wall 10 during the expansion process, thereby effectively preventing the infiltration of groundwater. By setting the protrusion 14 to a dovetail groove structure, its shape is similar to the tenon in the mortise and tenon structure, which can be better embedded in the newly built exterior wall 16, so that the protrusion 14 is more firmly embedded in the newly built exterior wall 16; this structure can not only prevent the composite waterproof layer 13 from shifting due to external forces during construction, but also resist groundwater pressure and soil pressure during subsequent use, ensuring the long-term stability of the composite waterproof layer 13.

[0038] In some embodiments, see Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The construction method of the composite waterproof layer 13 includes: first constructing a non-curing rubber asphalt waterproof coating layer 131 connected together on the facade of the existing exterior wall 10 and the surface of the newly built base plate cushion layer 12, and then constructing a double-sided reactive bonding polymer waterproof membrane layer 132 on the non-curing rubber asphalt waterproof coating layer 131.

[0039] Specifically, a non-curing rubber asphalt waterproof coating is scraped or sprayed on the surface of the exterior wall waterproofing membrane 101 of the existing exterior wall 10 and the surface of the newly built baseboard cushion layer 12 to form a non-curing rubber asphalt waterproof coating layer 131. Among them, the non-curing rubber asphalt waterproof coating is a waterproof coating that is made of rubber, asphalt, and softening oil as the main components, and is mixed with stabilizers and fillers to maintain a viscous paste during its service life. It does not solidify after long-term contact with air and can maintain the characteristics of a viscous colloid. It has strong self-healing ability, sticks to the touch, and is difficult to peel off. A double-sided reactive adhesive polymer waterproof membrane is laid on the surface of the non-curing rubber asphalt waterproof coating layer 131 to form a double-sided reactive adhesive polymer waterproof membrane layer 132. Among them, the double-sided reactive adhesive polymer waterproof membrane is a waterproof membrane with a reactive adhesive layer compounded on both sides of the polymer membrane base. When the membrane contacts the concrete structure layer, the active ingredients in the adhesive layer can react with the chemical components in the concrete to form a strong adhesive layer.

[0040] Accordingly, the non-curing rubber asphalt waterproof coating layer 131 constructed first serves as an adhesive and water seepage channel blocking material for the double-sided reactive adhesive polymer waterproof membrane layer 132, thereby achieving the first anti-seepage barrier that integrates the new underground space floor with the existing underground space structure exterior wall. The double-sided reactive adhesive polymer waterproof membrane layer 132 constructed next serves as a protective outer layer for the non-curing rubber asphalt waterproof coating layer 131, thereby achieving the second anti-seepage barrier that integrates the new underground space floor with the existing underground space structure exterior wall. The two anti-seepage barriers not only seamlessly integrate the waterproofing between the new and old structures, but also seal the water seepage channel. The double-sided reactive adhesive polymer waterproof membrane layer 132 also has self-adhesive and self-healing properties through chemical reactions with concrete. Therefore, after the concrete of the new underground space is poured, it can form a molecular group connection, achieving a tight connection between the composite waterproof layer 13 and the new underground space structure, thereby improving the anti-seepage performance of the new underground space.

[0041] The non-curing rubber asphalt waterproof coating layer 131 serves as both a waterproof coating and an adhesive for the roll material. Its construction is simple and does not rely on the skill level of skilled workers. Furthermore, during the construction of the double-sided reactive adhesive polymer waterproof roll material layer 132, there is no need to use a torch to bake the roll material, thus avoiding secondary damage to the roll material. The two anti-seepage barriers formed by the non-curing rubber asphalt waterproof coating layer 131 and the double-sided reactive adhesive polymer waterproof roll material layer 132 are both self-healing, thus greatly improving the anti-seepage performance.

[0042] In some embodiments, see Figure 1 The construction method of the underground space composite waterproof structure provided in the embodiment of the present application further includes: constructing a caulking sealing structure 17 between the top of the newly built exterior wall 16 and the facade of the existing exterior wall 10.

[0043] Accordingly, by constructing a caulking sealing structure 17 between the top of the newly built exterior wall 16 and the facade of the existing exterior wall 10, the top of the gap between the newly built exterior wall 16 and the existing exterior wall 10 is sealed, thereby reducing the rate at which the composite waterproof layer 13 is oxidized by contact with the outside air and increasing the service life of the composite waterproof layer.

[0044] For example, see Figure 5 The construction method of the caulking sealing structure 17 includes: first embedding non-curing rubber asphalt 171 at the top of the gap between the new exterior wall 16 and the existing exterior wall 10, and then pouring waterproof and crack-resistant mortar 172 between the upper end surface of the new exterior wall 16 and the facade of the existing exterior wall 10.

[0045] Accordingly, the non-curing rubber asphalt 171 can not only effectively prevent moisture from penetrating from the top of the gap, forming a reliable waterproof layer, but also has good self-healing properties, and can automatically repair minor damage caused by external forces to maintain the integrity of the waterproof layer. The waterproof and crack-resistant mortar 172 further enhances the waterproof effect and has good crack resistance, which can effectively prevent cracks caused by temperature changes and deformation of the base layer. The double waterproof structure composed of the non-curing rubber asphalt 171 and the waterproof and crack-resistant mortar 172 can also reduce the rate at which the composite waterproof layer 13 is oxidized by contact with the outside air, thereby increasing the service life of the composite waterproof layer 13.

[0046] In some embodiments, see Figure 1 、 Figure 4 A transition portion 18 is provided between the surface of the newly constructed baseboard cushion layer 12 and the exterior surface of the existing exterior wall 10. Accordingly, the provision of the transition portion 18 provides a transition surface for the installation of the waterproof membrane, allowing the waterproof membrane to adhere to the surface of the transition portion 18 at the connection point between the newly constructed baseboard cushion layer 12 and the existing exterior wall 10, thereby preventing the waterproof membrane from experiencing hollowing or wrinkling at this location. This improves the installation quality of the waterproof membrane and enhances the reliability of the waterproof effect.

[0047] In some embodiments, see Figure 1 、 Figure 4 When the new base plate 15 is cast, anchor bars 19 connected to the existing exterior wall 10 are pre-embedded in the new base plate 15. Accordingly, by pre-embedding anchor bars 19 fixedly connected to the existing exterior wall 10 in the new base plate 15, the structural connection strength between the new base plate 15 and the existing exterior wall 10 is enhanced, effectively improving the stability of the overall structure.

[0048] In some embodiments, see Figure 1 、 Figure 4 , one of the protrusions 14 is facing the newly built bottom plate 15. Accordingly, by arranging one protrusion 14 facing the newly built bottom plate 15, an emergency anti-seepage and water-stopping barrier can be formed between the newly built bottom plate 15 and the existing exterior wall 10, thereby improving the anti-seepage performance.

[0049] In some embodiments, see Figure 1 、 Figure 3 When a construction joint 161 is provided on the newly-built exterior wall 16, a water-stop steel plate 20 is provided at the construction joint 161. In the gap between concrete operations, the surface of the construction joint 161 should be roughened for the second time.

[0050] Accordingly, by installing waterstop steel plates 20 at construction joints 161 of newly constructed exterior walls 16, waterstop steel plates 20 form a water barrier that prevents water from penetrating along construction joints 161, thereby enhancing the waterproofing of the newly constructed underground space. Waterstop steel plates 20 also enhance the structural strength of construction joints 161, reducing the risk of cracks caused by factors such as temperature fluctuations and uneven settlement, thereby enhancing the structural stability and durability of newly constructed exterior walls 16.

[0051] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A construction method for an underground space composite waterproof structure, characterized in that: include: A plurality of horizontally arranged water-expandable waterstops (11) are provided at vertical intervals on the exterior surface of the existing exterior wall (10); A composite waterproof layer (13) is constructed and connected to the exterior facade of the existing exterior wall (10) and the surface of the newly constructed base plate cushion layer (12), wherein the composite waterproof layer (13) protrudes outward at the position of each water-swelling waterstop (11) and forms a protruding portion (14) for accommodating the water-swelling waterstop (11); A new base plate (15) is cast in situ above the new base plate cushion layer (12), and a new exterior wall (16) is cast in situ on the side of the new base plate cushion layer (12) close to the existing exterior wall (10). The new exterior wall (16) is closely attached to the composite waterproof layer (13) on the existing exterior wall (10), and the protruding portion (14) is pre-buried in the new exterior wall (16).

2. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: The construction method of the composite waterproof layer (13) comprises: First, a non-curing rubber asphalt waterproof coating layer (131) is constructed and connected to the exterior surface of the existing exterior wall (10) and the surface of the newly built base plate cushion layer (12), and then a double-sided reactive bonding polymer waterproof membrane layer (132) is constructed on the non-curing rubber asphalt waterproof coating layer (131).

3. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: The protruding portion (14) is a dovetail groove structure.

4. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: Along a direction perpendicular to the exterior facade of the existing exterior wall (10), the size of the composite waterproof layer (13) on the newly built base plate cushion (12) is greater than 2000 mm.

5. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: Also includes: A caulking sealing structure (17) is constructed between the top of the newly constructed exterior wall (16) and the exterior facade of the existing exterior wall (10).

6. The construction method of underground space composite waterproof structure according to claim 5, characterized in that: The construction method of the caulking sealing structure (17) comprises: First, non-curing rubber asphalt (171) is embedded in the top of the gap between the newly built exterior wall (16) and the existing exterior wall (10), and then waterproof and crack-resistant mortar (172) is poured between the upper end surface of the newly built exterior wall (16) and the exterior surface of the existing exterior wall (10).

7. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: A transition portion (18) is provided between the surface of the newly built baseboard cushion layer (12) and the exterior facade of the existing exterior wall (10).

8. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: When the newly built base plate (15) is cast, embedded reinforcement bars (19) connected to the existing exterior wall (10) are pre-buried in the newly built base plate (15).

9. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: One of the protrusions (14) faces the newly built base plate (15).

10. The construction method of underground space composite waterproof structure according to claim 1, characterized in that: When a construction joint (161) is provided on the newly built exterior wall (16), a water-stop steel plate (20) is provided at the construction joint (161).

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