Operation station anti-floating reinforcing structure and construction method

Abstract

The invention discloses an operation station anti-floating reinforcing structure and a construction method, and belongs to the technical field of underground engineering. The structure comprises a construction fence, a retention wall, a station side wall with a breaking range, a fender post structure, a permanent and temporary combined anti-floating component, a rubber water stop strip and an I-steel temporary support, and a reinforcement cage of the permanent and temporary combined anti-floating component is connected with a fender post main reinforcement and a main body structure side wall reinforcement in an anchoring manner to form a cooperatively stressed anti-floating system; the method comprises the steps that a construction fence and a retention wall are arranged; grouting pipes are driven to stop water, holes are explored and dug for verification, station side walls are broken in a bin-by-bin and segmented mode, and I-shaped steel is erected; a rubber water stop strip is plugged in; and a fender post structure is broken, a reinforcement cage is bound, concrete is poured, and construction is completed. Reliable connection is established between the station main body structure and the enclosure structure, and the floating risk caused by underground water rising is reduced; construction in the station in the whole process reduces the influence of earth surface enclosure and traffic relief, and reduces the influence on pipelines at the top of the station.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering technology, specifically relating to an anti-buoyancy reinforcement structure and construction method for an operating station. Background Technology

[0002] With the protection of groundwater resources, the groundwater in some cities has been effectively replenished, and the groundwater level has been rising year by year. This has caused the groundwater level in some subway stations to be higher than the anti-buoyancy design level, posing a risk of uplift to the subway structure and threatening its structural safety.

[0003] This invention aims to provide an anti-buoyancy reinforcement structure and construction method for operating stations. By constructing a combination of permanent and temporary anti-buoyancy components within the station, the scope of components can be flexibly set according to the station's anti-buoyancy requirements. This connects the main station structure without anti-buoyancy measures to the enclosure structure, effectively increasing the station structure's anti-buoyancy resistance and reducing the risk of floating of operating stations due to rising groundwater. At the same time, it effectively avoids construction enclosure and traffic diversion problems caused by constructing anti-buoyancy components on the ground surface, and reduces the impact on pipelines on the top of the operating station. It has broad application prospects and high promotion value. Summary of the Invention

[0004] This invention is proposed to solve the problems existing in the prior art, and its purpose is to provide an anti-buoyancy reinforcement structure and construction method for operating stations.

[0005] The technical solution of this invention is: an anti-buoyancy reinforcement structure for operating stations, comprising: The station side wall is part of the existing main structure of the station. Its vertical range can be flexibly adjusted according to the existing pipeline layout. The demolition range is formed on the station side wall. A retaining pile structure is provided on the outside of the station side wall, and the retaining pile structure includes the main reinforcement of the retaining pile and the spiral stirrups of the retaining pile. A permanent and temporary combined anti-buoyancy component is installed between the demolition area of ​​the station side wall and the retaining pile structure; The permanent and temporary combined anti-buoyancy component includes a permanent and temporary combined anti-buoyancy component steel cage, which is anchored to the main reinforcement of the retaining pile and the main structural side wall reinforcement of the station side wall to form a synergistic anti-buoyancy system.

[0006] Furthermore, the demolition scope includes the demolition scope of the first station side wall, the demolition scope of the second station side wall, the demolition scope of the third station side wall, and the demolition scope of the fourth station side wall.

[0007] Furthermore, a rubber waterstop strip is installed between the demolition area of ​​the station side wall and the retaining pile structure. The rubber waterstop strip is used to prevent groundwater from flowing into the existing station from the soil layer.

[0008] Furthermore, I-beams are erected within the area of ​​the demolished side wall of the station and cast inside the permanent-temporary combined anti-buoyancy component.

[0009] Furthermore, the permanent and temporary combined anti-buoyancy component steel cage includes steel bars anchored into the retaining pile structure, and the stirrups of the steel bars are open for inserting into the main reinforcement of the retaining pile.

[0010] Furthermore, the permanent-temporary combined anti-buoyancy component is in the form of a cast-in-place concrete component, or the permanent-temporary combined anti-buoyancy component is in the form of a high-performance precast shell combined with cast-in-place concrete.

[0011] Furthermore, the spiral stirrups of the retaining piles are aligned with the demolition area.

[0012] Furthermore, rubber waterstops are installed within the breach area. These rubber waterstops are used for waterstopping between the station side walls and the permanent and temporary combined anti-buoyancy components.

[0013] A construction method for an anti-buoyancy reinforcement structure for an operating station includes the following steps: A. Carry out construction preparations and implement construction protection measures inside and outside the station side walls; B. Verify the local water-stopping effect and demolish the existing structure within the area of ​​the station side wall; C. Waterproofing treatment of the station side walls and retaining pile structure within the demolition area; D. Construct a permanent and temporary anti-buoyancy component between the side walls and retaining piles of the construction station to achieve anti-buoyancy reinforcement of the operating station.

[0014] Furthermore, step D involves constructing a permanent and temporary anti-buoyancy component between the station's side walls and retaining pile structure to achieve anti-buoyancy reinforcement of the operating station. The specific process is as follows: First, break through part of the retaining pile structure and sort out the main reinforcement of the retaining piles; Then, the permanent and temporary combined anti-buoyancy component steel cage is tied and anchored to the main reinforcement of the retaining pile. Then, the permanent and temporary combined anti-buoyancy component steel cage is anchored to the main structure side wall steel reinforcement. Finally, the concrete for the permanent and temporary anti-buoyancy components was poured to complete the construction.

[0015] The beneficial effects of this invention are as follows: This invention enhances anti-buoyancy capabilities and ensures structural safety. Addressing the risk of uplift faced by existing operational station structures, it employs a construction method that combines permanent and temporary anti-buoyancy components within the station. This effectively ensures the connection between the main station structure and the enclosure structure, increases the station structure's anti-buoyancy resistance, and reduces the risk of uplift caused by rising groundwater levels in operational stations.

[0016] This invention allows for flexible setting of the reinforcement range. Construction barriers can be flexibly set up inside the station according to the station's anti-buoyancy requirements and operational conditions. The location and range of the permanent and temporary combined anti-buoyancy components can be determined according to the actual anti-buoyancy calculation requirements, achieving reinforcement on demand and avoiding excessive construction.

[0017] This invention reduces the impact of surface construction, effectively avoiding construction barriers and traffic diversion problems caused by surface construction of anti-buoyancy components. It is particularly suitable for anti-buoyancy reinforcement of subway stations in urban centers, significantly reducing the impact on ground traffic and the surrounding environment.

[0018] This invention reduces interference with overhead pipelines. Since the entire construction process is carried out inside the station, there is no need for large-scale excavation on the ground surface, which reduces the impact on overhead pipelines of the operating station and avoids the additional costs and delays caused by pipeline relocation.

[0019] This invention combines temporary and permanent structures, optimizing stress performance. Temporary vertical supports made of I-beams are integrally cast into the permanent-temporary combined anti-buoyancy component, transforming the temporary supports into a component of the permanent structure, thus achieving permanent-temporary integration and optimizing the structural stress performance. The stirrups of the reinforcing cage of the permanent-temporary combined anti-buoyancy component, where the reinforcing bars are anchored into the retaining piles, are made open to facilitate the insertion of the main reinforcing bars of the retaining structure, further enhancing its stress performance.

[0020] The waterproofing system of this invention is reliable. It forms a sealed water stop by injecting acrylate through the grouting pipe. Combined with the setting of rubber waterstop strips, it forms multiple waterproof protections. The arrangement of two rubber waterstop strips significantly enhances the waterproofing ability of the reinforced structure and ensures the waterproof safety of the operating station.

[0021] This invention offers high construction safety by employing a phased, modular demolition and support principle. Sensing measures are used before structural demolition to ensure the stability of the station structure during construction, thereby guaranteeing both operational and construction safety.

[0022] This invention has broad application prospects and high promotional value, and can provide an effective anti-buoyancy reinforcement solution for existing subway stations facing the risk of floating. Attached Figure Description

[0023] Figure 1 This is a schematic diagram showing the locations of the grouting pipe and the exploratory hole in this invention; Figure 2 This is a schematic diagram of the location of the permanent and temporary anti-buoyancy component in this invention; Figure 3 This is a cross-sectional schematic diagram of the structural node for breaking through the station side wall and retaining piles in this invention; Figure 4 This is a plan view of the structural nodes for breaking through the station side wall and retaining piles in this invention; Figure 5This is a schematic cross-sectional view of the steel reinforcement binding of the permanent and temporary anti-buoyancy component in this invention; Figure 6 This is a schematic diagram of the steel reinforcement binding of the permanent and temporary combined anti-buoyancy component in this invention; Figure 7 This is a plan view of the construction steps in this invention; Figure 8 This is an elevation view of the construction steps in this invention; Figure 9 This is a schematic diagram of the high-performance concrete shell in this invention; The components include: 1. Construction enclosure; 2. Water retaining wall; 3. Station side wall; 4. Retaining pile structure; 5. Permanent and temporary combined anti-buoyancy component; 6. Station roof slab; 7. Station interior; 8. Station middle slab; 9. Main structure side wall reinforcement; 10. Rubber waterstop strip; 11. Main reinforcement of retaining pile; 12. Spiral stirrup of retaining pile; 13. Water-stop curtain; 14. Permanent and temporary combined anti-buoyancy component reinforcement cage; 15. I-beam; 16. Demolition area of ​​the first station side wall; 17. Demolition area of ​​the second station side wall; 18. Demolition area of ​​the third station side wall; 19. Demolition area of ​​the fourth station side wall; 20. High-performance concrete shell; 21. Grouting pipe; 22. Excavation borehole. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 9 As shown, an anti-buoyancy reinforcement structure for an operating station includes: Station side wall 3 is part of the existing main structure of the station, and a demolition area is formed on the station side wall 3; The retaining pile structure 4 is set on the outside of the station side wall 3. The retaining pile structure 4 includes the main reinforcement 11 of the retaining pile and the spiral stirrup 12 of the retaining pile. The permanent and temporary combined anti-buoyancy component 5 is set between the demolition range of the station side wall 3 and the retaining pile structure 4; The permanent and temporary combined anti-buoyancy component 5 includes a permanent and temporary combined anti-buoyancy component steel cage 14, which is anchored to the main reinforcement of the retaining pile 11 and the main structural side wall reinforcement 9 in the station side wall 3, forming a synergistic anti-buoyancy system.

[0025] The demolition area includes the demolition area 16 of the first station side wall, the demolition area 17 of the second station side wall, the demolition area 18 of the third station side wall, and the demolition area 19 of the fourth station side wall.

[0026] A rubber waterstop strip 10 is installed between the demolition area of ​​the station side wall 3 and the retaining pile structure 4. The rubber waterstop strip 10 is used to prevent groundwater in the soil from flowing into the existing station.

[0027] I-beams 15 are erected within the area of ​​the demolition of the station side wall 3 and are cast inside the permanent and temporary combined anti-buoyancy component 5.

[0028] The permanent and temporary combined anti-buoyancy component steel cage 14 includes steel bars anchored into the retaining pile structure 4. The stirrups of the steel bars are open and used to insert the main reinforcement 11 of the retaining pile.

[0029] The permanent and temporary combined anti-buoyancy component 5 is in the form of cast-in-place concrete component, or the permanent and temporary combined anti-buoyancy component 5 is in the form of high-performance precast shell 20 combined with cast-in-place concrete.

[0030] The spiral stirrups 12 of the retaining piles are aligned with the demolition area.

[0031] A rubber waterstop strip 10 is installed within the demolition area. The rubber waterstop strip 10 is used for waterstopping between the station side wall 3 and the permanent and temporary combined anti-buoyancy component 5.

[0032] Specifically, a construction fence 1 is set up inside the existing operational station 7 to separate the construction area from the operational area.

[0033] Specifically, a retaining wall 2 is installed inside the construction enclosure 1 to prevent groundwater from flowing into the operating area. The retaining wall 2 has a pre-reserved outlet; water accumulated during construction flows through a drainage ditch into the station's sump, preventing groundwater from flowing into the operating area after the station side wall 3 is removed. The construction of the retaining wall 2 must take into account avoiding damage to the structural decoration of the operating subway station.

[0034] Specifically, the station side wall 3 is part of the existing main station structure, located between the station interior 7 and the enclosing structure 4. The station side wall 3 has designated demolition areas, including the first station side wall demolition area 16, the second station side wall demolition area 17, the third station side wall demolition area 18, and the fourth station side wall demolition area 19. The station side wall 3 contains main structural side wall reinforcement 9, including horizontal and vertical reinforcement. During the demolition process, the main structural side wall reinforcement 9 is sorted out and reserved for later anchoring into the permanent and temporary combined anti-buoyancy component 5, ensuring a reliable connection between the permanent and temporary combined anti-buoyancy component 5 and the station main structure.

[0035] Specifically, the retaining pile structure 4 is set on the outside of the station side wall 3, and the outside of the retaining pile structure 4 is the stop curtain 13. During the construction of the permanent and temporary combined anti-buoyancy component 5, part of the retaining pile structure 4 is broken, the main reinforcement 11 of the retaining pile is sorted out, and the main reinforcement 11 of the retaining pile is anchored to the steel cage 14 of the permanent and temporary combined anti-buoyancy component, so that the retaining pile structure 4 and the permanent and temporary combined anti-buoyancy component 5 are connected as a whole.

[0036] Specifically, the permanent and temporary combined anti-buoyancy component 5 is a key load-bearing component connecting the main structure of the station with the retaining pile structure 4.

[0037] The permanent-temporary combined anti-buoyancy reinforcement cage 14 includes vertical main bars, horizontal stirrups, and tie bars. The stirrups of the reinforcement anchored into the retaining piles must be open to facilitate insertion into the main reinforcement 11 of the retaining structure, thus improving its load-bearing performance. The permanent-temporary combined anti-buoyancy reinforcement cage 14 is a prefabricated reinforcement cage, which is prefabricated on the ground and then hoisted into place.

[0038] One side of the permanent and temporary combined anti-buoyancy component steel cage 14 is anchored to the main reinforcement 11 of the retaining pile, and the upper and lower parts are anchored to the side wall reinforcement 9 of the main structure, forming an anti-buoyancy system that connects the main structure of the station with the retaining pile structure 4 into a whole.

[0039] Specifically, the permanent and temporary combined anti-buoyancy component steel cage 14 is a prefabricated steel cage.

[0040] A construction method for an anti-buoyancy reinforcement structure for an operating station includes the following steps: A. Carry out construction preparations, including construction protection inside and outside the station side wall 3; B. Verify the local water-stopping effect and carry out the demolition of the station side wall 3 within the demolition range; C. Waterproofing treatment of the station side wall 3 and retaining pile structure 4 within the demolition area; D. The permanent and temporary anti-buoyancy components 5 between the side walls 3 and the retaining pile structure 4 of the construction station are used to achieve anti-buoyancy reinforcement of the operating station.

[0041] Step D involves constructing a permanent and temporary anti-buoyancy component 5 between the station side wall 3 and the retaining pile structure 4 to achieve anti-buoyancy reinforcement of the operating station. The specific process is as follows: First, break through part of the retaining pile structure 4 and sort out the main reinforcement 11 of the retaining pile; Then, the permanent and temporary combined anti-buoyancy component steel cage 14 is tied and the permanent and temporary combined anti-buoyancy component steel cage 14 is anchored to the main reinforcement 11 of the retaining pile. Then, the permanent and temporary combined anti-buoyancy component steel cage 14 is anchored to the main structure side wall steel reinforcement 9; Finally, the concrete for the permanent and temporary combined anti-buoyancy component 5 was poured to complete the construction.

[0042] Specifically, step A involves construction preparation, including construction protection of the inside and outside of station side wall 3. The specific process is as follows: First, construction barriers 1 are set up inside the existing operational station 7 to isolate the construction area from the operational area and reduce the impact on the station's operational area; Then, a water-retaining wall 2 is constructed inside the construction enclosure 1 to prevent groundwater from flowing into the operating area after the subsequent removal of the station side wall 3.

[0043] Specifically, step B verifies the local water-stopping effect and proceeds with the demolition of the station side wall 3 within the demolition area. The specific process is as follows: First, grouting pipes 21 are installed at the edge of the proposed opening area on the side wall of the station; Then, acrylate is injected between the retaining pile structure 4 and the station side wall 3 to form a sealed water stop around the tunnel entrance; Next, borehole 22 was excavated in the center of the proposed opening area on the side wall of the station to verify the water-stopping effect; Next, the side wall 3 of the subway station was demolished section by section, and I-beams 15 were erected as temporary vertical supports, following the principle of demolition and support. Finally, the main structural side wall reinforcement 9 of the station side wall 3 was sorted out, and the main structural side wall reinforcement 9 was later anchored into the permanent and temporary combined anti-buoyancy component 5.

[0044] Specifically, step C involves waterproofing the station side wall 3 and retaining pile structure 4 within the demolition area. The specific process is as follows: Rubber waterstop strips 10 are inserted between the demolition area 16 of the first station side wall, the demolition area 17 of the second station side wall, the demolition area 18 of the third station side wall, the demolition area 19 of the fourth station side wall and the retaining pile structure 4 to prevent groundwater from flowing into the station from the soil layer.

[0045] In step A, the construction enclosure 1 is flexibly set up inside the station 7 according to the station's anti-buoyancy requirements and operational conditions.

[0046] In step A, the retaining wall 2 is provided with a water outlet, and the water accumulated during the construction process flows into the station's wastewater pumping station through the wall-separated ditch.

[0047] In step B, the temporary vertical support of the I-beam 15 is perforated when binding the permanent and temporary combined anti-buoyancy component steel cage 14, and the I-beam 15 is integrally cast into the permanent and temporary combined anti-buoyancy component 5.

[0048] In step B, the first station side wall demolition area 16, the second station side wall demolition area 17, the third station side wall demolition area 18, and the fourth station side wall demolition area 19 are demolished segment by segment. Before the demolition, the structural condition is monitored using sensing measures.

[0049] In step C, the rubber waterstop strip 10 is installed between the retaining pile structure 4, the station side wall 3, and the retaining pile structure 4 to seal the waterproof system.

[0050] In step D, the permanent and temporary combined anti-buoyancy component steel cage 14 is a prefabricated steel cage, and the stirrups of the steel bars anchored into the retaining pile are made into an open form to facilitate the insertion of the main reinforcement 11 of the retaining structure.

[0051] Specifically, the permanent-temporary combined anti-buoyancy component 5 is made of cast-in-place concrete. After the steel cage 14 of the permanent-temporary combined anti-buoyancy component is prefabricated on the ground, it is hoisted into place and connected and fixed with the main reinforcement 11 of the retaining piles and the side wall reinforcement 9 of the main structure. Then, concrete is poured on site to form a complete permanent-temporary combined anti-buoyancy component 5.

[0052] Specifically, the permanent-temporary combined anti-buoyancy component 5 adopts a high-performance precast shell 20 combined with cast-in-place concrete. The high-performance precast shell 20 is a precast component with an internal cavity. During construction, the high-performance precast shell 20 is hoisted into place and connected to the main reinforcement 11 of the retaining piles and the side wall reinforcement 9 of the main structure. Then, concrete is poured into the high-performance precast shell 20 to form a complete permanent-temporary combined anti-buoyancy component 5.

[0053] A second rubber waterstop strip 10 is installed at the support position of the I-beam 15 to enhance the waterproofing capability of the reinforced structure.

[0054] The anti-buoyancy reinforcement structure and construction method for operating stations of the present invention establish a reliable connection between the main structure and the enclosure structure through the above-mentioned structural composition and construction steps, forming a synergistic anti-buoyancy system. The reinforcement range can be flexibly set according to needs, reducing the risk of uplift caused by rising groundwater. At the same time, the construction is carried out entirely within the station, reducing the impact of surface enclosures and traffic diversion, and minimizing the impact on pipelines on the station roof.

Claims

1. A buoyancy-resistant reinforcement structure for an operating station, characterized in that: include: The station side wall (3) is part of the existing main structure of the station. Its vertical range is flexibly adjusted according to the existing pipeline layout, and a demolition range is formed on the station side wall (3). The retaining pile structure (4) is set on the outside of the station side wall (3). The retaining pile structure (4) includes the main reinforcement (11) of the retaining pile and the spiral stirrup (12) of the retaining pile. The permanent and temporary combined anti-buoyancy component (5) is set between the demolition range of the station side wall (3) and the retaining pile structure (4); The permanent and temporary combined anti-buoyancy component (5) includes a permanent and temporary combined anti-buoyancy component steel cage (14), which is anchored to the main reinforcement of the retaining pile (11) and the main structure side wall reinforcement (9) in the station side wall (3) to form a synergistic anti-buoyancy system.

2. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: The demolition area includes the demolition area of ​​the first station side wall (16), the demolition area of ​​the second station side wall (17), the demolition area of ​​the third station side wall (18), and the demolition area of ​​the fourth station side wall (19).

3. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: A rubber waterstop strip (10) is provided between the demolition area of ​​the station side wall (3) and the retaining pile structure (4). The rubber waterstop strip (10) is used to prevent groundwater in the soil from flowing into the existing station.

4. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: I-beams (15) are erected within the area of ​​the demolition of the station side wall (3) and cast inside the permanent and temporary combined anti-buoyancy component (5).

5. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: The permanent and temporary combined anti-buoyancy component steel cage (14) includes steel bars anchored into the retaining pile structure (4), and the stirrups of the steel bars are open and used to insert the main reinforcement (11) of the retaining pile.

6. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: The permanent and temporary combined anti-buoyancy component (5) is in the form of cast-in-place concrete component, or the permanent and temporary combined anti-buoyancy component (5) is in the form of high-performance precast shell (20) combined with cast-in-place concrete.

7. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: The spiral stirrups (12) of the retaining piles are aligned with the demolition area.

8. The anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: A rubber waterstop strip (10) is installed within the demolition area. The rubber waterstop strip (10) is used for waterstopping between the station side wall (3) and the permanent and temporary combined anti-buoyancy component (5).

9. The construction method of an anti-buoyancy reinforcement structure for an operating station according to claim 1, characterized in that: Includes the following steps: A. Carry out construction preparations and carry out construction protection inside and outside the station side wall (3); B. Verify the local water-stopping effect and demolish the existing structure in the area of ​​the station side wall (3); C. Waterproofing treatment of the station side walls (3) and retaining pile structure (4) within the demolition area; D. The permanent and temporary anti-buoyancy components (5) between the side wall (3) and the retaining pile structure (4) of the construction station are used to realize the anti-buoyancy reinforcement of the operating station.

10. A construction method for an anti-buoyancy reinforcement structure for an operating station according to claim 9, characterized in that: Step D involves constructing a permanent and temporary anti-buoyancy component (5) between the station side wall (3) and the retaining pile structure (4) to achieve anti-buoyancy reinforcement of the operating station. The specific process is as follows: First, break up the retaining pile structure at a certain depth (4) and sort out the main reinforcement of the retaining pile (11). Then, the permanent and temporary combined anti-buoyancy component steel cage (14) is tied and the permanent and temporary combined anti-buoyancy component steel cage (14) is anchored to the main reinforcement (11) of the retaining pile; Then, the permanent and temporary combined anti-buoyancy component steel cage (14) is anchored to the main structure side wall steel reinforcement (9); Finally, the concrete for the permanent and temporary combined anti-buoyancy component (5) was poured to complete the construction.

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