A waterproof structure for connecting nodes of new and old underground structures and a construction method thereof

Abstract

The present application relates to a waterproof structure for a connection node between a new and an old underground structure and a construction method thereof, which relates to the field of waterproof construction of underground projects. The structure includes a water stop plate fixed to a ground connection wall, the water stop plate being arranged at a subsequent connection between the top plate of the underground structure and the bottom plate of a newly constructed underground space; and a waterproof roll member, the waterproof roll member being arranged along the height direction of the ground connection wall, the waterproof roll member being in conflict with the ground connection wall, the water stop plate, and the top plate of the underground structure. The water stop plate is used to prevent the waterproof roll member from being damaged when the ground connection wall is broken, and the water stop plate and the waterproof roll member are used together to be folded and laid to the bottom of the bottom plate of the newly constructed underground space after the ground connection wall is broken. The water stop plate protects the waterproof roll member from being damaged when the ground connection wall is broken, and the water stop plate and the waterproof roll member are folded and laid on the bottom plate of the newly constructed underground space as a waterproof structure for the newly constructed underground space and the existing subway station project, which has the effect of convenient construction.

Description

Technical Field

[0001] The present application relates to the field of waterproof construction of underground projects, and in particular to a waterproof structure for connecting nodes of new and old underground structures and a construction method thereof. Background Art

[0002] With the acceleration of urbanization, more and more urban transportation options are being proposed. Subways, as a fast, efficient, environmentally friendly, and convenient means of transportation, have become an irreplaceable part of modern cities. Unlike above-ground construction projects, subway projects, with their primary structures located underground, place high demands on the waterproofing of station structures to ensure usability and durability.

[0003] Currently, the construction of existing subway stations typically begins with the construction of a ground-connected wall as a water-blocking, seepage-proof, and load-bearing enclosure. A waterproof membrane is then attached to the ground-connected wall as a waterproofing structure. The subway's underground structure roof is then constructed on top of the ground-connected wall. The waterproofing structure, which serves as the connection point between the ground-connected wall and the subway's underground structure roof, meets the waterproofing requirements. However, with population growth and the continuous expansion of urban areas, the subway network is constantly adding new lines. Existing subway transfer stations are no longer able to meet current demand, necessitating the construction of new underground spaces to expand existing stations to accommodate the growing passenger flow.

[0004] Existing technology requires structural connection between the construction of new underground spaces and existing subway station projects. This connection requires first removing the ground-connected walls, then constructing the new underground space floor. The new underground space floor and the removed ground-connected walls are then cast together to connect with the existing subway's underground structure roof. However, removing the ground-connected walls damages the existing waterproof structure, necessitating the reconstruction of the waterproof structure between the underground space floor, underground structure roof, and ground-connected walls to achieve waterproofing. This requires significant manpower and material resources to waterproof the connection nodes, resulting in a heavy workload and a long time-consuming process. Summary of the Invention

[0005] In order to solve the problem that the original waterproof structure will be damaged and need to be reconstructed during the structural connection between the new underground space and the existing subway station project, the present application provides a waterproof structure for the connection node of the new and old underground structures and its construction method.

[0006] The present application provides a waterproof structure for connecting nodes between new and old underground structures and a construction method thereof, which adopts the following technical solutions:

[0007] A waterproof structure for a connection node between an old and a new underground structure, comprising a water stop plate fixed on a ground connection wall, wherein the water stop plate is arranged at a subsequent connection between the top plate of the underground structure and the bottom plate of a newly built underground space; and further comprising a waterproof roll member, wherein the waterproof roll member is arranged along the height direction of the ground connection wall, and the waterproof roll member is in conflict with the ground connection wall, the water stop plate and the top plate of the underground structure. The water stop plate is used to prevent the waterproof roll member from being damaged when the ground connection wall is broken. The water stop plate and the waterproof roll member are used together to bend toward one side of the bottom plate of the newly built underground space after the ground connection wall is broken and folded to the bottom of the bottom plate of the newly built underground space.

[0008] By adopting the above technical solution, during construction, the waterstop plate is set at the subsequent connection between the underground structure top plate and the new underground space bottom plate, the waterstop plate is fixed on the ground connection wall, and then the waterproof membrane is attached. The waterproof membrane is set along the height direction of the ground connection wall, and the waterproof membrane is in conflict with the ground connection wall, the waterstop plate and the underground structure top plate, thereby achieving waterproofing between the entire ground connection wall and the underground structure top plate; when building a new underground space, the ground connection wall is demolished. At this time, the setting of the waterstop plate can effectively protect the waterproof membrane from being damaged. After the ground connection wall is demolished, the waterstop plate and the waterproof membrane are moved to the new underground space bottom plate One side is bent and folded to the bottom of the new underground space floor, which can achieve waterproofing between the ground-connected wall and the underground structure top plate and the new underground space floor; this method can solve the problem that the original waterproof structure will be damaged and need to be re-constructed during the structural connection between the new underground space and the constructed subway station project, and has the effect of convenient construction, conveniently and effectively forming outsourced waterproofing, reducing the hidden dangers of water leakage in the later connection nodes, ensuring the quality of waterproofing during the construction process, and reducing the difficulty of waterproofing in the later nodes when not pre-buried, saving personnel, equipment and materials, shortening the construction period and improving economic benefits.

[0009] In a specific possible implementation scheme, the waterproof roll includes a structural waterproof layer attached to the ground-connected wall, and the structural waterproof layer extends to the water stop plate. The waterproof roll also includes a waterproof reinforcement layer attached to the side of the water stop plate close to the underground structure top plate, and the waterproof reinforcement layer extends to the structural waterproof layer.

[0010] By adopting the above technical solution, during construction, the water stop plate is fixed to the ground-connected wall, and then the structural waterproof layer is attached to the ground-connected wall. One side of the structural waterproof layer is extended and attached to the water stop plate, and then the waterproof reinforcement layer is attached to the water stop plate. The waterproof reinforcement layer is extended and attached to the structural waterproof layer. The structural waterproof layer and the waterproof reinforcement layer realize a leak-free connection between the entire ground-connected wall and the underground structure top plate, thereby improving the waterproof quality.

[0011] In a specific embodiment, a plastic film layer is provided on a side of the waterproof reinforcement layer close to the top plate of the underground structure, and the plastic film layer is used to separate the waterproof reinforcement layer from the top plate of the underground structure.

[0012] By adopting the above technical solution and utilizing the setting of the plastic film layer, the waterproof reinforcement layer can be separated from the underground structure top plate when pouring the underground structure top plate, which can ensure the use of the waterproof reinforcement layer after the ground-connected wall is removed.

[0013] In a specific embodiment, it further includes a sealant layer, which is used to seal the gap between the waterproof membrane and the top plate of the underground structure and the bottom plate of the newly built underground space.

[0014] By adopting the above technical solution, the gap between the waterproof membrane and the top plate of the underground structure and the bottom plate of the newly built underground space is sealed with a sealant layer, thereby reducing the hidden danger of water leakage between the waterproof membrane and the top plate of the underground structure and the bottom plate of the newly built underground space after the waterproof membrane is bent after the ground connection wall is broken.

[0015] In a specific possible implementation scheme, it also includes a grouting pipe, which is used to be set at the position of the broken part of the ground-connected wall.

[0016] By adopting the above technical solution and utilizing the setting of grouting pipes, when water seeps into the joints between the newly built underground space and the already constructed subway station project, slurry can be injected through the grouting pipes to seal the joints, achieving the effect of sealing the joints, thereby facilitating water stopping and leak plugging.

[0017] In a specific embodiment, it further includes a waterproof coating layer, which is used to be coated on the top plate of the underground structure after the ground connection wall is broken.

[0018] By adopting the above technical solution, after breaking the ground connection wall, a waterproof coating layer is applied to the top plate of the underground structure, which can strengthen the waterproofing of the connection node between the top plate of the underground structure and the subsequent newly built underground space floor and prevent leakage.

[0019] In a specific possible implementation scheme, it also includes a water stop strip, which is used to be arranged at the subsequent connection between the top plate of the underground structure and the bottom plate of the newly built underground space.

[0020] By adopting the above technical solution, after breaking the ground-connected wall, waterstop strips are placed at the subsequent connection between the underground structure top plate and the new underground space bottom plate. The waterstop strips can achieve the effect of strengthening the waterproofing of the connection nodes.

[0021] In a specific possible implementation scheme, the water stop plate is fixed to the ground connection wall by waterproof nails.

[0022] By adopting the above technical solution, after the water stop plate is attached to the ground-connected wall, the water stop plate is fixed to the ground-connected wall using waterproof nails, thereby facilitating subsequent construction.

[0023] A construction method for connecting a new and old underground structure comprises the following steps:

[0024] Step 1: construct the underground structure top plate and waterproof structure, tie the underground structure top plate steel bars to reserve subsequent connection steel bars and set sleeves, attach a waterstop plate to the part of the ground-connected wall located at the reserved connection node between the new underground space bottom plate and the underground structure top plate, fix the waterstop plate to the ground-connected wall with waterproof nails, lay and attach the structural waterproof layer on the ground-connected wall, lay and attach the structural waterproof layer on the waterstop plate, then lay and attach the waterproof reinforcement layer on the side of the waterstop plate away from the ground-connected wall, lay the waterproof reinforcement layer on the structural waterproof layer, then stick a plastic film layer on the side of the waterproof reinforcement layer away from the waterstop plate, and pour the underground structure top plate concrete;

[0025] Step 2: Excavate the new underground space floor to the design elevation and remove the concrete at the connection node between the new underground space floor and the underground structure top plate;

[0026] Step 3: Bend the water stop plate and the waterproof reinforcement layer toward one side of the newly built underground space and turn them outward onto the new underground space floor cushion layer, and seal the waterproof reinforcement layer with the underground structure top plate and the new underground space floor cushion layer through the sealant layer;

[0027] Step 4: roughen and clean the connection nodes of the underground structure top plate, and apply a waterproof coating layer on the roughened surface of the underground structure top plate;

[0028] Step 5: Tie the new underground space floor slab steel bars, connect the new underground space floor slab steel bars with the reserved underground structure top slab steel bars through the reserved sleeves, and reinforce the new underground space floor slab steel bars and the reserved underground structure top slab steel bars by setting water stop strips;

[0029] Step 6: Pre-buried grouting pipes at the connection points between the new underground space floor and the underground structure roof to facilitate water stoppage and leak plugging in the later stage;

[0030] Step seven: pour the concrete of the connection node between the new underground space floor and the underground structure top plate, as well as the concrete of the new underground space floor.

[0031] In summary, this application includes at least one of the following beneficial technical effects: BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the waterproof structure used for the connection node of the new and old underground structures of the present application.

[0033] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0034] Figure 3 It is a structural schematic diagram of the underground structure top plate and the newly built underground space bottom plate of this application.

[0035] Figure 4 yes Figure 3 Enlarged view of part B in the middle.

[0036] Explanation of the accompanying symbols: 1. Ground-connected wall; 111. Dashed box; 2. Underground structure top plate; 3. New underground space bottom plate; 4. Waterstop plate; 5. Waterproof membrane; 51. Structural waterproof layer; 52. Waterproof reinforcement layer; 6. Plastic film layer; 7. Sealant layer; 8. Grouting pipe; 9. Waterstop strip; 10. Waterproof coating layer; 11. New underground space bottom plate steel bar; 12. Underground structure top plate steel bar; 13. Sleeve. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-2 This application is described in further detail.

[0038] Example 1

[0039] Reference Figure 1 and Figure 2 , the embodiment of the present application discloses a waterproof structure for the connection node of the new and old underground structures, including a water stop plate 4 for attaching to the ground connection wall 1. In this embodiment, the water stop plate 4 can be but not limited to a 0.5 mm galvanized iron plate. The water stop plate 4 is arranged at the subsequent connection between the underground structure top plate 2 and the newly built underground space bottom plate 3. The water stop plate 4 is fixed to the ground connection wall 1 by waterproof nails; it also includes a waterproof coiled material 5, and the waterproof coiled material 5 includes a structural waterproof layer 51 attached to the ground connection wall 1. In this embodiment, the structural waterproof layer 51 can be but not limited to a 2 mm EPDM self-adhesive waterproof coiled material layer. The structural waterproof layer 51 is arranged along the height direction of the ground connection wall 1, and the structural waterproof layer 51 extends to the water stop plate 4 and is attached to the water stop plate 4;

[0040] The waterproof roll 5 also includes a waterproof reinforcement layer 52. In this embodiment, the waterproof reinforcement layer 52 may be, but is not limited to, a 2 mm EPDM self-adhesive waterproof roll layer. The waterproof reinforcement layer 52 is attached to the side of the waterstop plate 4 close to the underground structure top plate 2. The waterproof reinforcement layer 52 is arranged along the height direction of the waterstop plate 4. The waterproof reinforcement layer 52 extends to the structural waterproof layer 51 and is attached to the structural waterproof layer 51. The structural waterproof layer 51 is attached to one side of the waterstop plate 4 and is sandwiched between the waterstop plate 4 and the waterproof reinforcement layer 52. A plastic film layer 6 is provided on the side of the waterproof reinforcement layer 52 away from the waterstop plate 4. In this embodiment, the plastic film layer 6 may be, but is not limited to, a PVC plastic film layer. The side of the plastic film layer 6 away from the waterproof reinforcement layer 52 contacts the underground structure top plate 2. The plastic film layer 6 is used to separate the waterproof reinforcement layer 52 from the underground structure top plate 2.

[0041] Reference Figure 1 and Figure 3 The area indicated by the dotted box 111 is the area where the ground-connected wall will be subsequently demolished. The waterstop plate 4 is used to prevent the structural waterproof layer 51 and the waterproof reinforcement layer 52 from being damaged when the ground-connected wall 1 is demolished. After the ground-connected wall 1 is demolished, the waterstop plate 4, the structural waterproof layer 51 and the waterproof reinforcement layer 52 are bent toward one side of the newly-built underground space floor 3 and folded to the bottom of the newly-built underground space floor 3; thereby achieving a leak-free connection and enhanced waterproofing between the ground-connected wall 1 and the underground structure top plate 2 and the newly-built underground space floor 3, thereby solving the problem that the original waterproof structure will be damaged and needs to be reconstructed during the structural connection between the newly-built underground space and the already-constructed subway station project, conveniently and effectively forming outsourced waterproofing, reducing the hidden dangers of water leakage at the later connection nodes, and ensuring the quality of waterproofing during the construction process.

[0042] Reference Figure 3 , and also includes a sealing adhesive layer 7. In this embodiment, the sealing adhesive layer 7 can be but is not limited to a water-swellable polyurethane waterproof adhesive layer. The sealing adhesive layer 7 is used to seal the gap between the waterproof reinforcement layer 52 and the underground structure top plate 2 and the newly built underground space bottom plate 3 after the ground connection wall 1 is broken; thereby reducing the hidden danger of water leakage between the waterproof reinforcement layer 52 and the underground structure top plate 2 and the newly built underground space bottom plate 3 after the waterproof reinforcement layer 52 is bent.

[0043] Reference Figure 3 , and also includes a grouting pipe 8. In this embodiment, the grouting pipe 8 can be but is not limited to a full-section grouting pipe. The grouting pipe 8 is used to be set at the position of the broken part of the ground-connected wall 1. In this embodiment, the grouting pipe 8 is provided with an overflow hole and a grouting pinhole. The overflow hole is used for injecting waterproof material, and the grouting pinhole is used to facilitate docking with a grouting machine; when water seeps into the joint between the newly built underground space and the constructed subway station project, the waterproof material can be injected through the grouting pipe 8 to seal it, thereby achieving the effect of sealing the joint and facilitating water stopping and leak plugging.

[0044] Reference Figure 3 and Figure 4 , and also includes a waterproof coating layer 10. In this embodiment, the waterproof coating layer 10 can be but is not limited to a cement-based permeable crystalline waterproof coating layer. The waterproof coating layer 10 is used to be coated on the surface of the underground structure top plate 2 close to the ground wall 1 after the ground wall 1 is broken; thereby strengthening the waterproofing between the connection node between the underground structure top plate 2 and the subsequent newly built underground space floor 3, thereby achieving the effect of enhancing the prevention of leakage.

[0045] Reference Figure 3 and Figure 4 , and also includes a waterstop strip 9. In this embodiment, the waterstop strip 9 is a waterstop strip that expands when exposed to water. The waterstop strip 9 is used to be set at the subsequent connection between the underground structure top plate 2 and the newly built underground space bottom plate 3; when water seeps into the joint between the newly built underground space and the constructed subway station project, the waterstop strip 9 expands when exposed to water, thereby preventing water from entering the joint, thereby strengthening the waterproof effect of the connection node between the underground structure top plate 2 and the newly built underground space bottom plate 3.

[0046] The implementation principle of Example 1 is as follows: during construction, the water stop plate 4 is set at the subsequent connection between the underground structure top plate 2 and the newly built underground space bottom plate 3, the water stop plate 4 is attached to the ground wall 1, and the water stop plate 4 is fixed to the ground wall 1 with waterproof nails, and then the structural waterproof layer 51 is attached to the ground wall 1, and one side of the structural waterproof layer 51 is extended and attached to the water stop plate 4, and then the waterproof reinforcement layer 52 is attached to the water stop plate 4, and the waterproof reinforcement layer 52 is extended and attached to the structural waterproof layer 51, and the structural waterproof layer 51 and the waterproof reinforcement layer are connected. The reinforcement layer 52 realizes a leak-free connection between the entire ground-connected wall 1 and the underground structure top plate 2. Finally, a plastic film layer 6 is attached to the waterproof reinforcement layer 52, and then the concrete construction of the underground structure top plate 2 can be carried out. At this time, the plastic film layer 6 can separate the waterproof reinforcement layer 52 from the concrete of the underground structure top plate 2. After the construction is completed, the water stop plate 4, the structural waterproof layer 51 and the waterproof reinforcement layer 52 serve as the waterproof structure between the ground-connected wall 1 and the underground structure top plate 2, thereby meeting the waterproof requirements between the ground-connected wall 1 and the underground structure top plate 2.

[0047] When a new underground space needs to be built and the ground connection wall 1 is removed for structural connection, the water stop plate 4 can effectively protect the waterproof membrane 5 from being damaged. After the ground connection wall 1 is removed, the water stop plate 4, the structural waterproof layer 51 and the waterproof reinforcement layer 52 are all bent toward the side of the new underground space floor 3 and folded onto the bottom cushion layer of the new underground space floor 3. During this process, the plastic film layer 6 can smoothly tear off the waterproof reinforcement layer 52 from the concrete surface of the underground structure top plate 2.

[0048] Then, a sealant layer 7 is used to seal the gap between the waterproof reinforcement layer 52 and the underground structure top plate 2 and the newly built underground space bottom plate 3. Then, a waterproof coating layer 10 is applied to the surface of the underground structure top plate 2 close to the ground-connected wall 1. A water stop strip 9 is placed at the subsequent connection between the underground structure top plate 2 and the newly built underground space bottom plate 3. Finally, a grouting pipe 8 is arranged at the position of the broken part of the ground-connected wall 1 for subsequent grouting and water-stopping. That is, waterproofing can be achieved between the ground-connected wall 1 and the underground structure top plate 2 and the newly built underground space bottom plate 3. Finally, the newly built underground space bottom plate 3 and the broken part of the ground-connected wall 1 can be constructed together.

[0049] The waterproof structure used for the connection node of the new and old underground structures of the present application can solve the problem that the original waterproof structure will be damaged and needs to be re-constructed during the structural connection between the newly built underground space and the already constructed subway station project; and it can meet the waterproofing requirements between the ground-connected wall 1 and the underground structure top plate 2 in the early stage, and when the new underground space is built in the later stage, it is only necessary to bend and fold the original water stop plate 4, structural waterproof layer 51 and waterproof reinforcement layer 52 to meet the waterproofing requirements between the ground-connected wall 1 and the underground structure top plate 2 and the newly built underground space bottom plate 3, which has the effect of convenient construction, can conveniently and effectively form outsourced waterproofing, reduce the hidden dangers of water leakage in the later connection nodes, ensure the waterproofing quality during the construction process, reduce the difficulty of waterproofing in the later nodes when not pre-buried, save personnel, equipment and materials, shorten the construction period, and improve economic benefits.

[0050] Example 2

[0051] A construction method for connecting a new and old underground structure, using the waterproof structure described in Example 1; the method comprises the following steps:

[0052] Step 1: construct the underground structure top plate 2 and the waterproof structure, tie the underground structure top plate steel bars 12 to reserve subsequent connection steel bars and set a sleeve 13. In this embodiment, the sleeve 13 can be but not limited to a straight threaded sleeve. Attach the water stop plate 4 to the part of the ground wall 1 where the connection node between the new underground space bottom plate 3 and the underground structure top plate 2 is reserved. Use waterproof nails to fix the water stop plate 4 to the ground wall 1. Lay and attach the structural waterproof layer 51 on the ground wall 1. The structural waterproof layer 51 is laid on the water stop plate 4. Then, lay and attach the waterproof reinforcement layer 52 on the side of the water stop plate 4 away from the ground wall 1. The waterproof reinforcement layer 52 is laid on the structural waterproof layer 51. Then, stick the plastic film layer 6 on the side of the waterproof reinforcement layer 52 away from the water stop plate 4. Pour concrete into the underground structure top plate 2.

[0053] Step 2: Excavate the new underground space floor 3 to the design elevation, and remove the concrete at the connection node of the ground diaphragm wall 1 located at the new underground space floor 3 and the underground structure top 2. In this embodiment, the removed area of ​​the ground diaphragm wall 1 is the area indicated by the dotted box 111. During the removal of the ground diaphragm wall 1, the vertical reinforcement of the removed portion of the ground diaphragm wall 1 is retained.

[0054] Step 3: Bend the water stop plate 4 and the waterproof reinforcement layer 52 toward one side of the newly built underground space and turn them outward onto the cushion layer of the newly built underground space bottom plate 3, and seal the waterproof reinforcement layer 52 with the underground structure top plate 2 and the cushion layer of the newly built underground space bottom plate 3 through the sealant layer 7;

[0055] Step 4: roughen and clean the connection nodes of the underground structure top plate 2, and apply a waterproof coating layer 10 on the roughened surface of the underground structure top plate 2 after cleaning;

[0056] Step 5: Tie the new underground space bottom plate steel bars 11, connect and fix the new underground space bottom plate steel bars 11 and the reserved underground structure top plate steel bars 12 through the reserved sleeves 13, and reinforce the new underground space bottom plate steel bars 11 and the reserved underground structure top plate steel bars 12 by setting water stop strips 9;

[0057] Step 6: Pre-buried grouting pipes 8 are placed at the connection points between the new underground space floor 3 and the underground structure top plate 2. In this embodiment, the grouting pipes 8 may be, but are not limited to, full-section grouting pipes. A grouting pipe 8 is provided every 5 to 6 meters along the structural direction of the ground-connected wall 1 to facilitate water stopping and leak plugging in the later stage.

[0058] Step seven: pour concrete for the connection node between the newly built underground space floor 3 and the underground structure top plate 2, as well as the concrete for the newly built underground space floor 3.

[0059] The present invention can meet the waterproofing requirements between the ground-connected wall 1 and the underground structure top plate 2 in the early stage by arranging a waterstop plate 4, a structural waterproof layer 51 and a waterproof reinforcement layer 52 between the ground-connected wall 1 and the underground structure top plate 2; when a new underground space needs to be built in the later stage and the ground-connected wall 1 needs to be demolished for structural connection, the waterstop plate 4 can effectively protect the structural waterproof layer 51 and the waterproof reinforcement layer 52 from being damaged, thereby solving the problem that the original waterproof structure will be damaged and needs to be reconstructed during the structural connection between the new underground space and the constructed subway station project; and by folding and laying the waterstop plate 4, the structural waterproof layer 51 and the waterproof reinforcement layer 52 on the new underground space bottom plate 3 outward, waterproofing between the ground-connected wall 1, the underground structure top plate 2 and the new underground space bottom plate 3 can be achieved, which has the effect of convenient construction, can conveniently and effectively form outsourced waterproofing, reduce the hidden dangers of water leakage at the later connection nodes, ensure the waterproofing quality during the construction process, reduce the difficulty of waterproofing at the later nodes when not pre-buried, save costs, shorten construction period, and improve economic benefits.

[0060] The sealant layer 7, water stop strip 9 and waterproof coating layer 10 provided in the present invention can also strengthen the waterproofness of the connection node between the underground structure top plate 2 and the subsequent newly built underground space bottom plate 3, further reducing the hidden danger of water leakage between the waterproof reinforcement layer 52 and the underground structure top plate 2 after breaking the waterproof reinforcement layer 52 of the ground connection wall 1; and the present invention can promptly provide remedial measures when water leakage occurs in the later stage. When water seeps into the joint between the newly built underground space and the constructed subway station project, the setting of the pre-buried grouting pipe 8 can timely inject slurry to seal the joint to achieve the effect of sealing the joint, which is convenient for stopping water and plugging leaks.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A waterproof structure for connecting nodes between new and old underground structures, characterized by: It comprises a water stop plate (4) fixed on the ground connection wall (1), the water stop plate (4) being arranged at the subsequent connection between the underground structure top plate (2) and the newly built underground space bottom plate (3); it also comprises a waterproof roll material (5), the waterproof roll material (5) being arranged along the height direction of the ground connection wall (1), the waterproof roll material (5) being in conflict with the ground connection wall (1), the water stop plate (4) and the underground structure top plate (2), the water stop plate (4) being used to prevent the waterproof roll material (5) from being damaged when the ground connection wall (1) is broken, and the water stop plate (4) and the waterproof roll material (5) being used together to bend toward one side of the newly built underground space bottom plate (3) after the ground connection wall (1) is broken and folded to the bottom of the newly built underground space bottom plate (3); The waterproof roll (5) includes a structural waterproof layer (51) attached to the ground-connected wall (1), the structural waterproof layer (51) extending to the waterstop plate (4), and the waterproof roll (5) also includes a waterproof reinforcement layer (52) attached to the side of the waterstop plate (4) close to the underground structure top plate (2), the waterproof reinforcement layer (52) extending to the structural waterproof layer (51); A plastic film layer (6) is provided on one side of the waterproof reinforcement layer (52) close to the underground structure top plate (2), and the plastic film layer (6) is used to separate the waterproof reinforcement layer (52) from the underground structure top plate (2).

2. The waterproof structure for connecting new and old underground structures according to claim 1, characterized in that: It also includes a sealing adhesive layer (7), which is used to seal the gap between the waterproof roll material (5), the underground structure top plate (2), and the newly built underground space bottom plate (3).

3. The waterproof structure for connecting new and old underground structures according to claim 2, characterized in that: It also includes a grouting pipe (8), which is used to be arranged at the position of the broken part of the ground-connected wall (1).

4. The waterproof structure for connecting new and old underground structures according to claim 3, characterized in that: It also includes a waterproof coating layer (10), which is used to be coated on the underground structure top plate (2) after the ground connection wall (1) is broken.

5. The waterproof structure for connecting new and old underground structures according to claim 4, characterized in that: It also includes a water stop strip (9), which is used to be arranged at the subsequent connection between the underground structure top plate (2) and the newly built underground space bottom plate (3).

6. The waterproof structure for connecting new and old underground structures according to claim 5, characterized in that: The water stop plate (4) is fixed to the ground-connected wall (1) by means of waterproof nails.

7. A construction method for connecting a new and old underground structure, using the waterproof structure according to claim 6, characterized in that: The steps include: Step 1: construct the underground structure top plate (2) and the waterproof structure, tie the underground structure top plate steel bars (12) to reserve subsequent connecting steel bars and set sleeves (13), attach a water stop plate (4) to the part of the ground-connected wall (1) located at the reserved connection node between the newly built underground space bottom plate (3) and the underground structure top plate (2), fix the water stop plate (4) to the ground-connected wall (1) with waterproof nails, lay and attach a structural waterproof layer (51) on the ground-connected wall (1), lay the structural waterproof layer (51) on the water stop plate (4), lay and attach a waterproof reinforcement layer (52) on the side of the water stop plate (4) away from the ground-connected wall (1), lay the waterproof reinforcement layer (52) on the structural waterproof layer (51), and then stick a plastic film layer (6) on the side of the waterproof reinforcement layer (52) away from the water stop plate (4), and pour concrete for the underground structure top plate (2); Step 2: excavate the new underground space bottom plate (3) to the design elevation, and remove the concrete of the ground connection wall (1) located at the reserved connection node between the new underground space bottom plate (3) and the underground structure top plate (2); Step 3: bend the water stop plate (4) and the waterproof reinforcement layer (52) toward one side of the newly built underground space and turn them outward onto the cushion layer of the newly built underground space bottom plate (3), and seal the waterproof reinforcement layer (52) with the underground structure top plate (2) and the cushion layer of the newly built underground space bottom plate (3) through the sealant layer (7); Step 4: roughen and clean the connection node portion of the underground structure top plate (2), and apply a waterproof coating layer (10) on the roughened surface of the underground structure top plate (2); Step 5: tying the newly constructed underground space bottom plate steel bars (11), connecting the newly constructed underground space bottom plate steel bars (11) and the reserved underground structure top plate steel bars (12) through the reserved sleeves (13), and reinforcing the newly constructed underground space bottom plate steel bars (11) and the reserved underground structure top plate steel bars (12) by providing water stop strips (9); Step 6: pre-buried grouting pipes (8) at the connection nodes between the newly built underground space bottom plate (3) and the underground structure top plate (2) to facilitate water stopping and leak plugging in the later stage; Step seven, pouring the concrete of the connection node between the newly built underground space bottom plate (3) and the underground structure top plate (2) and the concrete of the newly built underground space bottom plate (3) together.

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