Waterproof structure for communication joint of new and old underground stations

Abstract

The utility model discloses a new and old underground station communication node waterproof structure and a construction method, communication nodes are arranged in a new station first floor passage part, an existing station enclosure structure passage part and an existing station first floor passage part, and an enclosure structure waterproof structure is formed on the side wall of the existing station enclosure structure passage part. A new station waterproof structure is formed on the side wall of the first negative floor channel part of the new station, an existing station waterproof structure is formed on the side wall of the first negative floor channel part of the existing station, and the outline of the outer protruding part is larger than the first negative floor channel part of the new station and the first negative floor channel part of the existing station. According to the ultra-high-performance concrete plugging structure, the water seepage distance is enlarged through construction embedding, underground water between the ultra-high-performance concrete plugging main body and the enclosure structure is introduced, and new and old concrete joints are plugged, so that the risk of underground water seepage can be greatly reduced, the influence on the durability of the structure is reduced, and the ultra-high-performance concrete plugging structure has a relatively wide application prospect and a relatively high popularization value.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground engineering, and in particular relates to a waterproof structure for a connecting node of a new and an old underground station. Background Art

[0002] With the rapid development of urbanization in my country, the demand for connecting old and new subway stations is increasing. When there are no reserved conditions for connection in the existing station, the connecting passage between the old and new stations requires the concrete structure of the existing station to be broken down in sections, resulting in new construction joints between the existing concrete structure, the existing retaining structure and the new concrete structure, causing water seepage and leakage between the new and old poured concrete.

[0003] Therefore, for the renovation project of a new station adjacent to an existing station, adopting a reasonable connection form and construction method can reduce the impact on the operational safety of the existing station, and strengthening the waterproofing treatment of the passage nodes will reduce the impact on the operational experience and structural durability.

[0004] At present, a lot of research has been done on the waterproofing of the interface structure between new and old concrete. For example, the existing patent application CN 201710243551.4 proposes a "waterproof structure of the interface between new and old concrete and its treatment method". It is achieved by laying a fiber-reinforced composite material on the interface of the old concrete after roughening, and applying an interface agent on the interface of the old concrete laid with the fiber-reinforced composite material before pouring the new concrete. The fiber-reinforced composite material is in full contact with the cement slurry, which better bonds with the cement slurry, reduces leakage and shrinkage of the cement slurry, and realizes the waterproofing of the interface structure between the new and old concrete. The waterproofing effect is further enhanced by opening a slit on the interface between the new and old concrete and setting a water stop plate corresponding to the slit.

[0005] The above structure achieves waterproofing of the interface structure between the new and old concrete to a certain extent, but it is difficult to evenly lay the fiber-reinforced composite mesh within the range of the steel bars, and inserting a waterstop plate into the existing concrete structure will increase the impact on the existing concrete structure. Summary of the invention

[0006] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a waterproof structure for connecting nodes of new and old underground stations.

[0007] The technical solution of the utility model is: a waterproof structure for connecting nodes between new and old underground stations, the connecting nodes are arranged in the underground first-floor passage part of the new station, the passage part of the existing station enclosure structure, and the passage part of the underground first floor of the existing station, the side walls of the passage part of the existing station enclosure structure form an enclosure structure waterproof structure, the side walls of the passage part of the new station underground first floor form a new station waterproof structure, the side walls of the passage part of the existing station underground first floor form an existing station waterproof structure, and the side walls of the passage part of the existing station enclosure structure form an outer convex part.

[0008] Furthermore, the outline of the convex portion is larger than the basement passage portion of a new station and the basement passage portion of an existing station.

[0009] Furthermore, the passage portion on the first basement floor of the new station is located in the side wall on the first basement floor of the new station, the passage portion on the enclosure structure of the existing station is located in the enclosure structure of the existing station, and the passage portion on the first basement floor of the existing station is located in the side wall on the first basement floor of the existing station.

[0010] Furthermore, the waterproof structure of the new station includes a steel-edged rubber waterstop and a waterstop strip, and the steel-edged rubber waterstop is transversely arranged in the side wall of the underground first floor of the new station and the passage part of the underground first floor of the new station.

[0011] Furthermore, the enclosure structure waterproof structure is a multi-layer structure between the passage portion of the existing station enclosure structure and the existing station enclosure structure.

[0012] Furthermore, the existing station waterproof structure includes a water stop strip, and the water stop strip is arranged at the contact side wall of the existing station underground first floor passage part and the existing station underground first floor side wall.

[0013] Furthermore, the water stop strips are arranged at the contact side walls of the underground first floor of the new station and the underground first floor passage of the new station.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model extends the water seepage distance by embedding the structure, introduces ultra-high performance concrete to seal the groundwater between the main body and the surrounding structure, and seals the joints between new and old concrete. It can greatly reduce the risk of groundwater infiltration and reduce the impact on the durability of the structure. It has a relatively broad application prospect and high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the breaking range of the connected nodes in the utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0018] Figure 3 yes Figure 1 A cross-sectional view along section BB;

[0019] in:

[0020] 1 New station underground first floor side wall 2 New station underground first floor passage

[0021] 3 Existing station enclosure structure 4 Existing station enclosure structure passage part

[0022] 5 Side wall of the existing station underground floor 6 Passageway of the existing station underground floor

[0023] 7External protrusion 8New concrete structure

[0024] 9Ultra-high performance concrete 10 Waterproof coating

[0025] 11 New station waterproofing layer 12 Existing station waterproofing layer

[0026] 13 Sealant 14 Steel edge rubber water stop

[0027] 15 Water stop strip 16 Covering soil

[0028] 17 Concrete pad 18 Ultra high performance concrete groove. DETAILED DESCRIPTION

[0029] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0030] like Figures 1 to 3 As shown, a waterproof structure of a node connecting a new and an old underground station is provided. The connecting nodes are arranged in the underground first-floor passage portion 2 of the new station, the retaining structure passage portion 4 of the existing station, and the underground first-floor passage portion 6 of the existing station. The retaining structure passage portion 4 of the existing station forms a retaining structure waterproof structure at the side wall, the new station waterproof structure is formed at the side wall of the underground first-floor passage portion 2 of the new station, the existing station waterproof structure is formed at the side wall of the underground first-floor passage portion 6 of the existing station, and the side wall of the retaining structure passage portion 4 of the existing station forms an outer protrusion 7.

[0031] The outline of the convex portion 7 is larger than the underground passage portion 2 of the new station and the underground passage portion 6 of the existing station.

[0032] The new station underground first floor passage section 2 is located in the new station underground first floor side wall 1, the existing station enclosure structure passage section 4 is located in the existing station enclosure structure 3, and the existing station underground first floor passage section 6 is located in the existing station underground first floor side wall 5.

[0033] The waterproof structure of the new station includes a steel-edged rubber waterstop 14 and a waterstop strip 15. The steel-edged rubber waterstop 14 is transversely arranged in the side wall 1 of the underground first floor of the new station and the passage part 2 of the underground first floor of the new station.

[0034] The enclosure structure waterproof structure is a multi-layer structure between the existing station enclosure structure passage portion 4 and the existing station enclosure structure 3.

[0035] The existing station waterproof structure includes a water stop strip 15, and the water stop strip 15 is arranged at the contact side wall of the existing station underground first floor passage part 6 and the existing station underground first floor side wall 5.

[0036] The water stop strip 15 is arranged at the contact side wall of the negative first floor side wall 1 of the new station and the negative first floor passage part 2 of the new station.

[0037] Specifically, Figure 2 As shown, the new station waterproof structure includes at least two waterstop strips 15, and the waterstop strips 15 are located on both sides of the steel-edge rubber waterstop strip 14.

[0038] Specifically, the mating surfaces of the side wall 1 of the first underground floor of the new station and the passage part 2 of the first underground floor of the new station are roughened.

[0039] Specifically, there are at least two water stop strips 15 in the existing station waterproof structure, and the mating surfaces of the existing station underground first floor passage 6 and the existing station underground first floor side wall 5 are roughened.

[0040] Specifically, the underground passage portion 6 of the existing station and the underground side wall 5 of the existing station away from the existing station enclosure structure 3 are roughened, and ultra-high performance concrete 9 is provided for end waterproofing.

[0041] Specifically, the enclosure structure waterproof structure includes, from the inside to the outside, a new concrete structure 8, ultra-high performance concrete 9, a waterproof coating 10, a new station waterproof layer 11, and an existing station waterproof layer 12.

[0042] More specifically, a sealant 13 is provided at the waterproof layer 11 of the new station.

[0043] Specifically, Figure 3 As shown, a concrete cushion layer 17 is arranged between the bottom of the passage structure at the connecting node and the existing station enclosure structure 3 .

[0044] Specifically, an ultra-high performance concrete embedding groove 18 is formed in the existing station enclosure structure 3 , and the ultra-high performance concrete embedding groove 18 accommodates the outer protrusion 7 .

[0045] Specifically, the top of the channel structure at the connecting node is backfilled with covering soil 16.

[0046] A construction method for a waterproof structure of a node connecting a new and an old underground station, comprising the following steps:

[0047] A. Construct the main structure of the new station and reserve conditions for later access;

[0048] B. Break the connection nodes, level them, and overlap the waterproof layer;

[0049] C.Use ultra-high performance concrete for leveling and blocking within the embedded range of the structure;

[0050] D. Cast new concrete structure.

[0051] Step A constructs the main structure of the new station and reserves the conditions for later channel connection. The specific process is as follows:

[0052] Construct the main structure of the new station and reserve conditions for later channel connection within the range of the connecting nodes.

[0053] Step B is to break the connection node position, level it, and overlap the waterproof layer. The specific process is as follows:

[0054] First, the existing station enclosure structure 3 is demolished, the concrete removal range of the existing station enclosure structure 3 is increased, and a concave embedding is constructed to increase the groundwater flow path;

[0055] Then, the existing station enclosure structure 3 is vertically cut, and there is groundwater seepage during construction. The rapid leveling of the broken surface is achieved by spraying early-strength concrete, which meets the conditions for laying a waterproof layer;

[0056] Then, overlap the waterproof layers of the new and old stations;

[0057] Finally, the outer side of the waterproof layer is sprayed with a waterproof coating 10 for reinforcement.

[0058] More specifically, in the above-mentioned overlapping process, the existing waterproof layer is at the bottom, the newly-built waterproof layer overlaps the existing waterproof layer by 1000 mm, and two layers of sealant 13 are used to seal.

[0059] Specifically, step D is pouring the new concrete structure, and the specific process is as follows:

[0060] First, the new concrete structure is poured, and a steel-edged rubber water stop 14 is set between the new structures;

[0061] Then, water stop strips 15 are arranged on both sides of the steel edge rubber water stop strip 14;

[0062] Finally, the area outside the joint between the new and old concrete is sealed with ultra-high performance concrete 9, and the sealing height is greater than the main body of the channel structure, so that the connection range is fully filled.

[0063] Specifically, in step D, two vertical waterstop strips are used to block water at the joints between the new and old concrete. The ultra-high performance concrete strips are symmetrically arranged along the joints, and all contact surfaces are roughened. The ultra-high performance concrete has super performance and water-proof properties, which can effectively block water seepage and enhance the structural strength of the joints between the new and old concrete.

[0064] Specifically, the inner concave depth in step B is 200 mm, which increases the water flow path between the main body and the surrounding structure gaps and optimizes the pouring conditions of the new concrete structure.

[0065] Specifically, in step B, the new and old waterproof membranes are effectively overlapped, the newly built waterproof layer overlaps the existing waterproof layer by 1000 mm, two layers of sealant 13 are used to seal, forming a closed-loop outer waterproof layer, and the waterproof coating 14 is used to enhance the overlap stability.

[0066] Specifically, in step C, ultra-high performance concrete is used for leveling and blocking within the structural embedding range, and the specific process is as follows:

[0067] First, the inner recess of the structure should be 200mm higher than the connecting node structure in the vertical direction;

[0068] Then, the outer skin of the side walls of the new and old main structures was roughened. After the passage structure was completed, the main structure was used as a casting template, and then ultra-high performance concrete was poured from top to bottom 9;

[0069] Finally, after reaching 80% of the strength requirement, the formwork is removed and subsequent construction steps are carried out.

[0070] Specifically, demolishing the existing station enclosure structure 3 from top to bottom can greatly improve the safety of the project, while ensuring the flatness of the demolished surface of the existing enclosure structure at the concave part of the structure, which is convenient for laying waterproof membranes, and can also play a role in strengthening the node frame beams and columns.

[0071] Specifically, the waterproof coating 14 has a thickness of 1.5 mm.

[0072] Specifically, the demolition range of the side wall 5 of the underground first floor of the existing station is increased to form a structural notch, and after the pouring of the new structure is completed, ultra-high performance concrete 9 is poured within the side wall range on the upper floor slab.

[0073] The utility model extends the water seepage distance by embedding the structure, introduces ultra-high performance concrete to seal the groundwater between the main body and the surrounding structure, and seals the joints between new and old concrete. It can greatly reduce the risk of groundwater infiltration and reduce the impact on the durability of the structure. It has a relatively broad application prospect and high promotion value.

Claims

1. A waterproof structure for connecting nodes between new and old underground stations, characterized in that: The connecting nodes are arranged in the underground first-floor passage section (2) of the new station, the existing station enclosure structure passage section (4), and the underground first-floor passage section (6) of the existing station. The side walls of the existing station enclosure structure passage section (4) form an enclosure structure waterproof structure, the side walls of the underground first-floor passage section (2) of the new station form a new station waterproof structure, the side walls of the underground first-floor passage section (6) of the existing station form an existing station waterproof structure, and the side walls of the existing station enclosure structure passage section (4) form an outer convex portion (7).

2. A waterproof structure for connecting nodes between new and old underground stations according to claim 1, characterized in that: The profile of the outer convex portion (7) is larger than that of the underground first-floor passage portion (2) of a new station and the underground first-floor passage portion (6) of an existing station.

3. A waterproof structure for connecting nodes between new and old underground stations according to claim 2, characterized in that: The new station underground first floor passageway (2) is located in the underground first floor side wall (1) of the new station, the existing station enclosure structure passageway (4) is located in the existing station enclosure structure (3), and the existing station underground first floor passageway (6) is located in the underground first floor side wall (5) of the existing station.

4. A waterproof structure for connecting nodes between new and old underground stations according to claim 3, characterized in that: The waterproof structure of the new station comprises a steel-edged rubber waterstop (14) and a waterstop strip (15). The steel-edged rubber waterstop (14) is transversely arranged in the side wall (1) of the first underground floor of the new station and the passage part (2) of the first underground floor of the new station.

5. The waterproof structure of the connection node between the new and old underground stations according to claim 3 is characterized by: The enclosure structure waterproof structure is a multi-layer structure between the existing station enclosure structure passage portion (4) and the existing station enclosure structure (3).

6. The waterproof structure of the connection node between the new and old underground stations according to claim 3 is characterized by: The existing station waterproof structure comprises a water stop strip (15), and the water stop strip (15) is arranged at the contact side wall of the underground first floor passage portion (6) of the existing station and the underground first floor side wall (5) of the existing station.

7. The waterproof structure of the connection node between the new and old underground stations according to claim 4 is characterized by: The water stop strip (15) is arranged at the contact side wall of the first underground floor of the new station (1) and the first underground floor passageway (2) of the new station.

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