Connection construction method between newly-built station and existing station

Abstract

The invention relates to a connection construction method between a newly-built station and an existing station, which is characterized in that underground diaphragm walls formed in respective excavation construction stages are arranged between station hall layers of main body structures of the existing station A and the newly-built station B, an overburden layer is arranged on the top surface of the station hall layer of the existing station A, and a construction trestle is arranged on the top surface of the station hall of the newly-built station B; in order to achieve transfer between the existing station A and the newly-built station B, transformation connection is conducted through a subsection breaking method and a constructed reinforced concrete frame, and anchoring connection is conducted between the reinforced concrete frame and a station main body structure through a steel bar planting method. When the side wall and the underground wall of the existing station A are broken, measures such as overlying soil unloading, construction of a water retaining and draining system and temporary supporting of a station hall layer are taken, so that the connection construction safety of the new station and the old station and the structure safety of the existing station A are ensured, and meanwhile, transfer connection between the two stations is smoothly realized; and the problem that the overall performance of the station is affected due to the fact that water seepage is prone to occurring at the connecting point of the existing station A and the newly-built station B is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a connection construction method between a newly built station and an existing station. Background Art

[0002] Building subways has become one of the effective ways to solve modern traffic problems. With the continuous expansion of the scale of urban subway construction, transfer stations occupy an increasingly important position in the urban rail transit network. The transfer between new and old subway lines and the construction in different phases will inevitably involve the connection between the later-built subway stations and the existing subway stations. When designing a subway station to be built first, designers generally reserve transfer interfaces to facilitate the design and construction of subsequent stations.

[0003] Due to the rapid development of modern cities, the subway network is constantly in a state of adjustment. Sometimes, transfer stations will appear without reserved transfer structure conditions. In such projects, if measures and methods are not taken to control the deformation of existing stations and to remove existing structures, it will have an extremely adverse impact on the safety of existing subway stations. For example, in a water-rich soft soil area, the existing station has been operating normally, and its structural settlement is basically in a stable state; while the settlement difference between the new station and the main body of the existing station is easy to occur. When the later construction encounters a large lateral span of the connecting channel and a complex surrounding environment, the connection design and construction plan are slightly unreasonable, which will cause irreversible damage to the existing station structure and water seepage between the station connections. Long-term immersion corrosion or uneven settlement between the new underground passage and the existing station and the freezing and thawing of the soil will cause the waterproof damage of the connection point between the existing station and the new station. Long-term repeated expansion and deterioration of the connection point in a cumulative manner will affect the overall performance of the station.

[0004] Therefore, in view of this, the inventor proposes a connection construction method between a new station and an existing station. Summary of the invention

[0005] One of the purposes of the present invention is to provide a connection construction method between a new station and an existing station, so as to solve the problem of unsafe connection between the existing station and the new station when no transfer structure conditions are reserved; the second purpose is to solve the problem of water seepage easily occurring at the connection point between the existing station and the new station, thereby affecting the overall performance of the station.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A method for connecting a new station with an existing station, including an existing station A of Line A and a new station B of Line B, comprises the following steps: S1: Excavate the top surface of the existing station A, unload the overburden layer, and construct water retaining sills and drainage ditches; S2: Use the segmented demolition method to construct part of the ground wall of the new station B to form the first channel. The lowest demolition line of the new station B is lower than the plane where the station hall is located; S3: construct the first frame structure above the first channel and set up temporary supports in the existing station A; S4: construct part of the ground wall of the existing station A by using a segmented demolition method to form a second passage, wherein the first passage corresponds to the second passage, and the lowest demolition line of the existing station A is lower than the plane where the station hall layer is located; S5: constructing a second frame structure above the second channel, and performing waterproofing treatment on the top surfaces of the first frame structure and the second frame structure; S6: Connect the existing station A and the newly built station B and perform bottom waterproofing. Fill the joints with the layered pouring method. After the concrete filled to the top layer solidifies, trim it to be flush with the plane of the station hall.

[0007] Furthermore, the existing station A includes a ground-connected wall a, and the newly built station B includes a ground-connected wall b; The ground-connected wall b is divided into three areas to be cut: b1, b2 and b3. The areas b1 and b3 on both sides are first broken, and then the middle area b2 is broken. The following steps are used to break each area of ​​the ground-connected wall b: S21: erect scaffolding around the area to be removed of the ground-connected wall b as a construction platform and supporting structure; S22: Measure, locate and mark according to design requirements; S23: Double rows of holes were drilled continuously around the tangent line using a water drill, and the scribed area was cut using a wire saw; S24: Chisel and clean the corners, retain the steel bars extending from the ground wall b and check the structural stability; S25: Repeat steps S21 to S24.

[0008] Further, in step S3, constructing the first framework structure includes the following steps: S31: erecting formwork; S32: Plant reinforcement and tie the reinforcement on the top of the newly built station B, and reserve reinforcement connectors; S33: After the formwork and steel bar binding are accepted, concrete is poured. After solidification, frame beams, columns and cantilever structures are formed. The frame beams, columns and cantilever structures are tied to the top of the new station B by embedded reinforcement.

[0009] Further, in step S4, the ground-connected wall a is divided into three areas to be cut a1, a2 and a3, and the areas a1 and a3 on both sides are first broken, and then the middle area a2 is broken. The following steps are used to break each area of ​​the ground-connected wall a: S41: erect scaffolding around the area to be cut off of the ground-connected wall a as a construction platform and supporting structure; S42: Measure, locate and mark according to design requirements; S43: Double rows of holes were drilled continuously around the tangent line using a water drill, and the scribed area was cut using a wire saw; S44: Chisel and clean the corners, retain the steel bars extending from the ground wall a and check the structural stability; S45: Repeat steps S41 to S44.

[0010] Further, after the ground-connected wall a and the ground-connected wall b are broken, the cross-section of the breaking line at the top of the ground-connected wall a and the ground-connected wall b presents a step-like structure; or The cross sections of the breaking lines at the tops of the ground-connected wall a and the ground-connected wall b are inclined toward the sides approaching each other.

[0011] Furthermore, the gap between the ground-connected wall a and the ground-connected wall b is not higher than 3m; The invention also includes constructing the gap between the ground-connected wall a and the ground-connected wall b, using the following steps: Loosening the soil, loosening the soil between the ground-connected wall a and the ground-connected wall b by means of a crushing mechanism; Negative pressure adsorption: under the action of negative pressure, the loose soil in the gap is adsorbed and discharged to the outside of the equipment, and collected and processed through pipes or containers; Put in the steel cage, make a qualified steel cage and place it between the ground-connected wall a and the ground-connected wall b; Pouring and curing, pouring concrete into the steel cage, forming a sandwich wall after the concrete solidifies, and the height of the sandwich wall is lower than the breaking line of the ground-connected wall a and the ground-connected wall b.

[0012] Furthermore, a concrete cushion is constructed on the top of the ground-connected wall a and the ground-connected wall b, and the upper surface of the concrete cushion is polished; a water collection tank is constructed on one side of the newly built station B or the existing station A; The bottom surface waterproofing treatment includes the following steps: a. Install a drainage ditch on the top of the mezzanine wall and pour the first layer of concrete around the drainage ditch; b. After the first layer of concrete is solidified, a first casting is formed, and an expansion joint is reserved in the middle position above the first casting, and a waterproof interlayer is arranged on both sides above the first casting; c. Pour a second layer of concrete on the waterproof interlayer, and after the second layer of concrete is solidified, a second casting is formed, and at least two layers of embedded waterstop are arranged on the second casting; d. Pour concrete above the topmost embedded waterstop, and after the concrete is solidified, a third casting is formed, and the third casting is trimmed to be flush with the plane where the station hall layer is located.

[0013] Furthermore, a drainage ditch is arranged along the length direction of the sandwich wall, the drainage ditch is set at a slope of 0.5% to 2%, and the drainage ditch is connected to the water collecting trough; pebbles are filled in the drainage ditch so that the pebbles are flush with the top of the drainage ditch, concrete is poured on the top of the sandwich wall, and after the concrete is solidified, a first casting body is formed, and the first casting body is flush with the upper surface of the drainage ditch; when pouring the second layer of concrete and the third layer of concrete, it also includes using a grouting conduit to grout below the embedded waterstop.

[0014] Furthermore, the waterproof interlayer includes an additional waterproof layer and a water-stopping tape, and the additional waterproof layer is coated on the upper surface of the first cast body; A plurality of adsorption holes are provided on both sides of the waterstop tape, and the waterstop tape is adhered to the concrete cushion layer through the adsorption holes. One end of the waterstop tape is adhered to the concrete cushion layer in a folded form, and the other end of the waterstop tape extends to the drainage groove and fits against the inner wall of the drainage groove.

[0015] Furthermore, after the connection between the station halls of the existing station A and the newly built station B is completed, the temporary support will be removed and the tops of the existing station A and the newly built station B will be covered with soil.

[0016] Beneficial effects of the present invention: The present invention adopts a segmented demolition method and reinforced concrete frame beams for reconstruction and connection. The first frame structure and the second frame structure are anchored to the main structure of the station by embedded reinforcement. When demolishing the ground-connected wall of the existing station A, measures such as unloading the overlying soil, constructing a retaining and drainage system, and taking temporary support measures at the station hall level are adopted. While ensuring the safety of the connection construction of the new station B and the structural safety of the existing station A, the transfer connection between the new station B and the adjacent existing station A is smoothly realized.

[0017] The present invention uses a segmented demolition method to demolish the wall when demolishing the ground-connected wall, which helps to control stress changes during the construction process, reduce the impact on the existing structure, and improve construction safety.

[0018] Concrete cushion layers are built on the top of ground-connected walls a and b, and the joints are finely polished so that they can fit with the waterstop tape. Several adsorption holes are opened on both sides of the waterstop tape, and the waterstop tape is attached to the concrete cushion layer through the adsorption holes. One end of the waterstop tape is folded and attached to the concrete cushion layer, and the other end of the waterstop tape extends to the drainage trough and fits with the inner wall of the drainage trough. Through the vacuum adsorption effect of the adsorption holes, the waterstop tape can fit tightly on the concrete cushion layer, reducing the risk of water leakage caused by gaps or looseness. This bonding method helps to form an effective waterproof barrier to prevent water penetration. At the same time, the waterstop tape has a certain degree of flexibility and elasticity, and can adapt to the slight deformation of the concrete cushion layer caused by temperature changes, foundation settlement, etc., which helps to maintain a close fit between the waterstop tape and the concrete cushion layer to prevent water leakage caused by deformation. One end of the waterstop tape is folded and attached to the concrete cushion layer, and the other end extends to the drainage trough and fits with the inner wall. This installation method enhances the stability of the waterstop tape and prevents it from falling off or shifting due to external forces during construction. The waterstop tape not only stops water, but also extends to the drainage trough to integrate with the drainage system. In this way, even if water penetrates the concrete cushion layer, it can be guided to the drainage trough and discharged in time, thus achieving dual protection of drainage and leakage prevention.

[0019] Other advantages, objectives and features of the present application will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application. The objectives and other advantages of the present application can be achieved and obtained through the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a state when a new station and an existing station are not connected in the connection construction method between a new station and an existing station of the present invention; Figure 2 It is a schematic diagram of the state of excavating the ground connection wall b of the new station in the connection construction method between the new station and the existing station of the present invention; Figure 3 It is a schematic diagram of the state of excavating the ground connection wall a of the new station and building temporary support in the connection construction method between the new station and the existing station of the present invention; Figure 4 It is a structural schematic diagram of the connection construction method between a new station and an existing station of the present invention after the excavation of the ground connection wall a is completed; Figure 5 It is a structural schematic diagram after the first frame structure and the second frame structure are constructed in the connection construction method between a new station and an existing station of the present invention; Figure 6 It is a schematic diagram of the structure after the new station of the present invention is connected with the existing station; Figure 7 It is a cross-sectional schematic diagram of the newly built station and the existing station of the present invention when they are not connected; Figure 8 It is a schematic diagram of the connection plan between the newly built station and the existing station of the present invention; Fig. 9 This is a schematic diagram of the structure of connecting a newly built station with an existing station and performing bottom waterproofing treatment in the present invention; Fig.10 The new station of the present invention and the existing station Fig. 9 Schematic diagram of the structure of part C; Fig.11 It is a schematic diagram of the structure when the concrete cushion layer and the water stop roll of the present invention are connected together; Fig.12 It is a schematic diagram of the structure when the concrete cushion layer and the water-stop tape of the present invention are separated.

[0021] Among them, the covering layer 1, the water retaining sill 2, the drainage ditch 3, the first channel 4, the second channel 5, the station hall layer 6, the first frame structure 7, the second frame structure 8, the temporary support 9, the concrete cushion layer 10, the sump 11, the drainage ditch 12, the first cast body 13, the waterproof interlayer 14, the additional waterproof layer 141, the water stop roll 142, the adsorption hole 1421, the second cast body 15, the embedded water stop 16, the third cast body 17, the pebbles 18, the interlayer wall 19, and the grouting conduit 20. DETAILED DESCRIPTION

[0022] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] This embodiment proposes a connection construction method between a new station and an existing station, such as Figures 1 to 12As shown, including the existing station A of Line A and the new station B of Line B, the following steps are adopted for implementation: S1: excavate the top surface of the existing station A, unload the overburden layer 1, and construct the water retaining sill 2 and the drainage ditch 3; Use excavators and other mechanical equipment to carry out excavation work according to the design plan, and gradually unload the overburden 1 on the top surface of the existing station A of Line A; construct the foundation of the water retaining sill 2 according to the design requirements to ensure that the foundation is stable, and use appropriate materials (such as concrete, bricks and stones, etc.) to build the water retaining sill 2 to ensure that the height, width and strength of the water retaining sill 2 meet the design requirements; Figure 1 and Figure 8 As shown, after the overburden layer 1 on the top surface of the existing station A is excavated, the left side of the overburden layer 1 presents an inclined slope. Unloading the overburden layer 1 can reduce the soil pressure on the top of the existing station A and reduce the risk of collapse in subsequent work; the drainage ditch 3 is located above the overburden layer 1. The setting of the drainage ditch 3 can avoid water accumulation and avoid affecting subsequent construction operations; the water retaining sill 2 is set on the top surface of the existing station A after the overburden excavation to effectively block the entry of external water sources. The construction of the water retaining sill 2 and the drainage ditch 3 can effectively block the entry of external water sources, which is conducive to the subsequent construction.

[0025] S2: Use the segmented demolition method to construct part of the ground wall of the new station B to form the first channel 4. The lowest demolition line of the new station B is lower than the plane where the station hall layer 6 is located; like Figure 1 As shown, the existing station A includes a ground-connected wall a, and the newly built station B includes a ground-connected wall b; in the present invention, the ground-connected wall a and the ground-connected wall b need to be broken down in sections to achieve the connection between the station hall layer 6 of the existing station A and the station hall layer 6 of the newly built station B. Specifically, Figure 1 , Figure 2 and Figure 8As shown, the ground-connected wall b is divided into three areas to be cut, b1, b2 and b3. The areas b1 and b3 on both sides are respectively broken first, and then the middle area b2 is broken. Since the ground-connected wall b is a continuous structure, it is easy to generate stress and deformation during partial demolition. The present invention can gradually release and disperse these stresses and deformations by first cutting off the areas on both sides (b1 and b3), thereby reducing the impact on the middle area (b2) and surrounding structures. After the areas on both sides (b1 and b3) are cut off first, a more stable and safe operating environment can be provided for the construction of the middle area (b2). At the same time, if there is a problem with the middle area (b2) during the demolition process, the areas that have been cut off on both sides can also be used as emergency passages or support structures to facilitate timely evacuation and processing by construction personnel. During the cutting process, the accuracy of the cutting line and the flatness of the cutting surface can be ensured through precise measurement and positioning, as well as the use of professional cutting tools (such as water drills, wire saws, etc.). Cutting off the two side areas first can reduce the direct impact and damage to the middle area and surrounding structures, and protect the integrity and stability of the structure. Construction in different areas can be carried out in parallel or adjusted appropriately according to the construction progress to make full use of resources and time and improve construction efficiency.

[0026] The following steps are used to break down each area of ​​the ground-connected wall b: S21: Set up scaffolding around the area to be cut off of the ground-anchored wall b as a construction platform and supporting structure; first, design and set up a stable scaffolding system according to the size and shape of the area to be cut off of the ground-anchored wall b. The scaffolding must have sufficient load-bearing capacity and stability to support construction personnel, tools and materials. The height and layout of the scaffolding should be convenient for construction personnel to operate and take into account the smooth progress of subsequent construction steps.

[0027] S22: Carry out measurement, positioning and marking according to design requirements; after the scaffolding is erected, use high-precision measuring instruments (such as total stations, laser rangefinders, etc.) to accurately measure the area to be cut off. According to the design drawings, mark the exact cutting boundary line on the ground-connected wall, mark the position of the steel bars and key structural points to be retained, so as to provide reference for subsequent construction.

[0028] S23: Use a water drill to continuously drill double rows of holes around the tangent, and use a wire saw to cut the marked area; after the marking is completed, use a water drill to continuously drill double rows of holes around the tangent, and use a wire saw to divide the structural wall into blocks with a horizontal cutting spacing of 1.5m and a vertical cutting spacing of 1m, and cut in layers from top to bottom. The present invention uses a method combining a water drill + a wire saw during construction, which has low cutting noise and generates little vibration, thereby reducing interference with the existing operating station A.

[0029] S24: Chisel and clean the corners, retain the steel bars extending from the ground-connected wall b, and check the structural stability; after the cutting is completed, use tools such as pneumatic picks and hammers to carefully chisel the corners, and pay attention to protecting the steel bars and surrounding structures that need to be retained during the chiseling process. After the chiseling is completed, the cut area is thoroughly cleaned to remove the remaining concrete fragments, steel bar heads and other debris. At the same time, the retained steel bars are sorted and protected to avoid damage in subsequent construction. The retained steel bars can be used as support and reinforcement for the new wall panels to increase the overall strength and stability of the wall. In the subsequent wall construction, the steel bars will be firmly embedded in the concrete and work together with the concrete to form a solid wall structure.

[0030] S25: Repeat steps S21 to S24.

[0031] like Figure 4 and Figure 5 As shown, S3: construct a first frame structure 7 above the first channel 4, and set a temporary support 9 in the existing station A; construct a stable first frame structure 7 above the first channel 4 to cope with the load changes that may occur during the construction; ensure the safety of the connection construction between the new station B and the existing station A, and set a temporary support 9 in the existing station A. The temporary support 9 can share part of the load borne by the existing station A during the construction, reduce the burden on the existing structure, and effectively enhance the structural stability of the existing station A during the construction, and prevent structural deformation or damage due to construction loads or other external forces.

[0032] Furthermore, constructing the first frame structure 7 includes the following steps: S31: Set up the formwork; at this stage, the formwork position needs to be accurately measured and located according to the design drawings, and high-strength, corrosion-resistant formwork materials such as steel formwork or bamboo plywood are used to ensure that the formwork surface is flat and the joints are tight. At the same time, the support system of the formwork is strengthened, and a stable structure such as steel pipe scaffolding or gantry is used to ensure that the formwork does not deform or move during the concrete pouring process. S32: Planting reinforcement and tying the reinforcement on the top of the newly built station B, and reserving reinforcement connectors; The present invention plants reinforcement on the top of the newly built station B, accurately drills holes according to design requirements, and injects high-performance reinforcement glue, then plants the reinforcement into the holes to ensure that the reinforcement is tightly combined with the existing concrete structure. At the same time, the planted reinforcement is tied to form a stable reinforcement skeleton. In addition, sufficient reinforcement connectors need to be reserved to connect with the reinforcement of the first frame structure 7 later to ensure the integrity and continuity of the structure.

[0033] S33: After the formwork and steel bar binding are accepted, the concrete is poured. After solidification, frame beams, columns and cantilever structures are formed. The frame beams, columns and cantilever structures are tied to the top of the new station B through embedded reinforcement. After the formwork and steel bar binding are completed and strictly accepted, the concrete pouring work can be carried out; the pouring speed and vibration intensity need to be controlled during the pouring process. After the concrete reaches the design strength, a stable frame beam, column and cantilever structure will be formed. These structures not only bear the first channel 4 and subsequent construction loads, but also are tightly tied to the top of the new station B through embedded reinforcement to form an overall force system.

[0034] S4: Use the segmented demolition method to construct part of the ground wall of the existing station A to form the second channel 5. The first channel 4 corresponds to the second channel 5, and the lowest demolition line of the existing station A is lower than the plane where the station hall layer 6 is located; Furthermore, in step S4, the ground-connected wall a is divided into three areas a1, a2 and a3 to be cut, and the areas a1 and a3 on both sides are broken first, and then the middle area a2 is broken. The ground-connected wall a is divided into three areas a1, a2 and a3 to be cut, and the areas a1 and a3 on both sides are broken first, and then the middle area a2 is broken. Since the ground-connected wall a is a continuous structure, it is easy to generate stress and deformation during partial demolition. The present invention can gradually release and disperse these stresses and deformations by first cutting off the areas on both sides (a1 and a3), thereby reducing the impact on the middle area (a2) and surrounding structures. After the areas on both sides (a1 and a3) are cut off first, a more stable and safe operating environment can be provided for the construction of the middle area (a2).

[0035] The following steps are used to break down each area of ​​the ground-connected wall a: S41: erect scaffolding around the area to be cut off of the ground-connected wall a as a construction platform and supporting structure; S42: Measure, locate and mark according to design requirements; S43: Double rows of holes were drilled continuously around the tangent line using a water drill, and the scribed area was cut using a wire saw; S44: Chisel and clean the corners, retain the steel bars extending from the ground wall a and check the structural stability; S45: Repeat steps S41 to S44.

[0036] S5: constructing a second frame structure 8 above the second channel 5, and performing waterproofing treatment on the top surfaces of the first frame structure 7 and the second frame structure 8; in the present invention, constructing the second frame structure 8 is similar to constructing the first frame structure 7 as described above, and will not be described in detail.

[0037] S6: Connect the existing station A and the newly built station B and perform bottom waterproofing. Fill the joints with layered pouring. After the concrete filled to the top layer solidifies, trim it to be flush with the plane of the station hall layer 6.

[0038] Furthermore, after the ground-connected wall a and the ground-connected wall b are broken, the cross-section of the breaking line at the top of the ground-connected wall a and the ground-connected wall b is a step-shaped structure; or the cross-section of the breaking line at the top of the ground-connected wall a and the ground-connected wall b is inclined toward the side close to each other. The use of a step-shaped structure can increase the contact area of ​​the top of the ground-connected wall a and the ground-connected wall b after breaking, thereby enhancing the stability of the structure in the horizontal direction, helping to resist external loads and reduce the stress concentration caused by breaking. In addition, the step-shaped structure provides a more stable support surface for subsequent construction operations (such as installing the drainage trough 12, waterproofing, etc.), and construction workers can also perform safer operations on the steps, minimizing damage to the ground-connected wall a and the ground-connected wall b themselves and their surrounding structures, which helps to protect the integrity and stability of the original structure and reduce the workload of repair and reinforcement. In the present invention, the gap between the ground-connected wall a and the ground-connected wall b is also constructed. Since the newly built station B is adjacent to the existing station A, and the gap between the ground-connected wall a and the ground-connected wall b is not higher than 3m; due to the limited distance between the two, the traditional excavation does not meet the construction conditions and cannot be implemented at a close distance, and the construction is difficult. The present invention adopts the method of loose soil and negative pressure adsorption for implementation. The specific implementation method is as follows: Loosen the soil. Use the crushing mechanism to loosen the soil between the ground-connected wall a and the ground-connected wall b. Use the crushing mechanism to accurately crush the soil between the ground-connected wall a and the ground-connected wall b, and avoid damage to the surrounding ground-connected walls by controlling the crushing force and depth.

[0039] In a possible implementation, vibration or water jet auxiliary technology may also be used to improve the loosening effect and reduce dust.

[0040] Negative pressure adsorption, under the action of negative pressure, the loose soil in the gap is adsorbed and discharged to the outside of the equipment, and collected and processed through pipes or containers; during or after the loosening process, the negative pressure adsorption device is immediately started, and the loose soil and fine particles in the gap are quickly adsorbed through the efficient dust suction pipe, and transported to a special collection container or treatment system. It has a compact structure and is easy to implement.

[0041] Put in the steel cage, make a qualified steel cage and place it between the ground-connected wall a and the ground-connected wall b; Pouring and curing, pouring concrete into the steel cage, forming a sandwich wall 19 after the concrete solidifies. The sandwich wall 19 formed by pouring can connect the existing station A and the newly built station B, facilitating the subsequent connection between the existing station A and the newly built station B.

[0042] The height of the sandwich wall 19 is lower than the breaking line of the ground-connected wall a and the ground-connected wall b. By adopting the method of crushing and adsorption, the damage and interference to the surrounding ground-connected walls are effectively reduced, ensuring a good connection between the sandwich wall 19 and the ground-connected walls. At the same time, the method of steel cage and concrete pouring is adopted to improve the overall quality and durability of the sandwich wall 19. The application of negative pressure adsorption significantly reduces dust and waste emissions during the construction process, reducing pollution to the environment. At the same time, the collected and processed loose soil can be further used in other projects or harmlessly treated to achieve resource recycling. The height of the sandwich wall 19 is lower than the breaking line of the ground-connected wall a and the ground-connected wall b. The ground-connected wall a and the ground-connected wall b are waterproof barriers for underground structures, and their waterproof performance is very important. The height of the sandwich wall 19 is lower than the breaking line of the ground-connected wall, which can ensure that the waterproof layer of the ground-connected wall is not damaged during the construction process, thereby improving the overall waterproof effect of the underground structure. At the same time, the gaps between the interlayer wall 19 and the ground-connected walls a and b can be sealed by taking waterproof measures to reduce the risk of groundwater or other liquids leaking through the gaps.

[0043] Furthermore, if Fig. 9 and Fig.10 As shown, a concrete cushion layer 10 is constructed on the top of the ground-connected wall a and the ground-connected wall b, and the upper surface of the concrete cushion layer 10 is polished. In the present invention, a concrete cushion layer 10 is constructed on the top of the ground-connected wall a and the ground-connected wall b. The concrete cushion layer 10 can serve as a connecting layer between the ground-connected walls, which can significantly improve the overall stability of the underground structure, effectively disperse and transfer the load, and reduce the structural deformation and damage caused by uneven settlement of the foundation of the newly built station B or other external factors. Moreover, before the initial setting of the concrete, the upper surface of the concrete cushion layer 10 is polished with a trowel or mechanical tools, which can improve the density and impermeability of the concrete cushion layer 10, and effectively prevent groundwater or other liquids from penetrating into the interior of the underground structure. At the same time, the polishing treatment also facilitates the subsequent installation of the waterproof interlayer 14.

[0044] like Fig.10 As shown, a water collection tank 11 is built on one side of a newly built station B or an existing station A; the water collection tank 11 is used to temporarily store groundwater and then store leaked groundwater.

[0045] The bottom surface waterproofing treatment includes the following steps: a. installing a drainage ditch 12 on the top of the sandwich wall 19, and pouring a first layer of concrete around the drainage ditch 12; specifically, the drainage ditch 12 is arranged along the length direction of the sandwich wall 19, and the drainage ditch 12 is set at a slope of 0.5% to 2%. The drainage ditch 12 is connected to the sump 11 for drainage; filling the drainage ditch 12 with pebbles 18 so that the pebbles 18 are flush with the top of the drainage ditch 12, and the gaps between the pebbles 18 can provide a good water seepage channel, so that the water flow can be discharged more smoothly through the drainage ditch 12. This natural drainage method helps to reduce water accumulation and is not easy to form film or blockage, thereby keeping the drainage ditch 12 unobstructed for a long time; pouring concrete on the top of the sandwich wall 19, and after the concrete is cured, a first casting body 13 is formed, and the first casting body 13 is flush with the upper surface of the drainage ditch 12.

[0046] b. After the first layer of concrete is cured, a first cast body 13 is formed, and an expansion joint is reserved in the middle position above the first cast body 13, and a waterproof interlayer 14 is arranged on both sides above the first cast body 13; the waterproof interlayer 14 includes an additional waterproof layer 141 and a water stop tape 142, and the additional waterproof layer 141 is coated on the upper surface of the first cast body 13; like Fig.12 As shown, a plurality of adsorption holes 1421 are provided on both sides of the water-stopping tape 142. The water-stopping tape 142 is attached to the concrete cushion layer 10 through the adsorption holes 1421. One end of the water-stopping tape 142 is attached to the concrete cushion layer 10 in a rolled-up form, and the other end of the water-stopping tape 142 extends to the drainage groove 12 and fits against the inner wall of the drainage groove 12. Through the vacuum adsorption effect of the adsorption holes 1421, the water-stopping tape 142 can fit tightly against the concrete cushion layer 10, reducing the risk of water leakage caused by gaps or looseness. This fitting method helps to form an effective waterproof barrier to prevent water penetration. At the same time, the water-stopping tape 142 has a certain degree of flexibility and elasticity, and can adapt to the slight deformation of the concrete cushion layer 10 caused by temperature changes, foundation settlement, etc., which helps to maintain a close fit between the water-stopping tape 142 and the concrete cushion layer 10 to prevent water leakage caused by deformation. One end of the water stop tape 142 is folded and attached to the concrete cushion layer 10, and the other end extends to the drainage groove 12 and fits with the inner wall. This installation method enhances the stability of the water stop tape 142 and prevents it from falling off or shifting due to external forces during the construction process. The water stop tape 142 not only plays a water stop role, but also is combined with the drainage system through its design of extending to the drainage groove 12. In this way, even if water penetrates the concrete cushion layer 10, it can be guided to the drainage groove 12 in time and discharged, thereby achieving dual protection of drainage and leakage prevention.

[0047] c. Pour a second layer of concrete on the waterproof interlayer 14, and form a second casting body 15 after the second layer of concrete is solidified, and arrange at least two layers of embedded waterstop 16 on the second casting body 15; d. Pour concrete above the top layer of embedded waterstop 16, and form a third casting body 17 after the concrete is solidified, and trim the third casting body 17 to be flush with the plane where the station hall layer 6 is located.

[0048] The second layer of concrete is poured on the waterproof interlayer 14. This step is intended to strengthen the structural strength of the waterproof interlayer 14 and provide a stable base for further construction thereon. The solidified second cast body 15 provides a solid foundation for the subsequent arrangement of the waterstop. At least two layers of embedded waterstop 16 are arranged on the second cast body 15. Even if one layer of the waterstop is damaged or fails, the other layers can still effectively prevent moisture penetration. The embedded waterstop 16 is used to prevent moisture penetration and protect the building structure from water damage. The present invention uses more than two layers of waterstop to increase the redundancy of waterproofing and improve the waterproofing effect. Concrete is poured above the top layer of the embedded waterstop 16. After the concrete is solidified, the third cast body 17 is formed, which strengthens the connection strength between the existing station A and the newly built station B, the integrity and stability of the waterproof structure, and the third cast body 17 is trimmed to be flush with the plane where the station hall layer 6 is located. The final trimming step ensures the coordination and aesthetics of the waterproof structure with the overall building structure. At the same time, it also provides convenience for subsequent construction and use.

[0049] When pouring the second and third layers of concrete, the grouting conduit 20 is also used to inject grout below the embedded waterstop 16 .

[0050] When the second layer of concrete and the third layer of concrete are initially solidified, grouting can be used to fill the tiny gaps between the embedded waterstop 16 and the concrete, further enhancing the waterproof sealing. Since gaps are inevitable in concrete (such as concrete shrinkage, temperature changes, etc.), which are often potential channels for water infiltration, grouting can effectively close these channels to prevent water infiltration. Grouting can promptly detect and repair these potential defects to prevent them from developing into serious leakage problems, solving the problem of water seepage at the connection point between the existing station A and the newly built station B, which affects the overall performance of the station.

[0051] After the connection between the concourse level 6 of the existing station A and the newly built station B is completed, the temporary support 9 is removed, the top of the existing station A and the newly built station B is covered with soil, and traffic is restored.

[0052] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A method for connecting a new station with an existing station, including an existing station A of Line A and a new station B of Line B, characterized in that: The implementation includes the following steps: S1: Excavate the top surface of the existing station A, unload the overburden layer, and construct water retaining sills and drainage ditches; S2: Use the segmented demolition method to construct part of the ground wall of the new station B to form the first channel. The lowest demolition line of the new station B is lower than the plane where the station hall is located; S3: construct the first frame structure above the first channel and set up temporary supports in the existing station A; S4: construct part of the ground wall of the existing station A by using a segmented demolition method to form a second passage, wherein the first passage corresponds to the second passage, and the lowest demolition line of the existing station A is lower than the plane where the station hall layer is located; S5: constructing a second frame structure above the second channel, and performing waterproofing treatment on the top surfaces of the first frame structure and the second frame structure; S6: Connect the existing station A and the newly built station B and perform bottom waterproofing. Fill the joints with layered pouring. After the concrete filled to the top layer solidifies, trim it to the same level as the station hall layer.

2. The method for connecting a new station with an existing station according to claim 1, characterized in that: The existing station A includes a ground-connected wall a, and the newly built station B includes a ground-connected wall b; The ground-connected wall b is divided into three areas to be cut: b1, b2 and b3. The areas b1 and b3 on both sides are first broken, and then the middle area b2 is broken. The following steps are used to break each area of ​​the ground-connected wall b: S21: erect scaffolding around the area to be removed of the ground-connected wall b as a construction platform and supporting structure; S22: Measure, locate and mark according to design requirements; S23: Double rows of holes were drilled continuously around the tangent line using a water drill, and the scribed area was cut using a wire saw; S24: Chisel and clean the corners, retain the steel bars extending from the ground wall b and check the structural stability; S25: Repeat steps S21 to S24.

3. The method for connecting a new station with an existing station according to claim 2, characterized in that: In step S3, constructing the first framework structure includes the following steps: S31: erecting formwork; S32: Plant reinforcement and tie the reinforcement on the top of the newly built station B, and reserve reinforcement connectors; S33: After the formwork and steel bar binding are accepted, concrete is poured. After solidification, frame beams, columns and cantilever structures are formed. The frame beams, columns and cantilever structures are tied to the top of the new station B by embedded reinforcement.

4. The method for connecting a new station with an existing station according to claim 3, characterized in that: In step S4, the ground-connected wall a is divided into three areas to be cut a1, a2 and a3. The areas a1 and a3 on both sides are first broken, and then the middle area a2 is broken. The following steps are used to break each area of ​​the ground-connected wall a: S41: erect scaffolding around the area to be cut off of the ground-connected wall a as a construction platform and supporting structure; S42: Measure, locate and mark according to design requirements; S43: Double rows of holes were drilled continuously around the tangent line using a water drill, and the scribed area was cut using a wire saw; S44: Chisel and clean the corners, retain the steel bars extending from the ground wall a and check the structural stability; S45: Repeat steps S41 to S44.

5. The method for connecting a new station with an existing station according to claim 4, characterized in that: After the ground-connected wall a and the ground-connected wall b are broken, the cross-section of the breaking line at the top of the ground-connected wall a and the ground-connected wall b is a step-like structure; or The cross sections of the breaking lines at the tops of the ground-connected wall a and the ground-connected wall b are inclined toward the sides approaching each other.

6. The method for connecting a new station with an existing station according to claim 2, characterized in that: The gap between the ground-connected wall a and the ground-connected wall b is not higher than 3m; The invention also includes constructing the gap between the ground-connected wall a and the ground-connected wall b, using the following steps: Loosening the soil, loosening the soil between the ground-connected wall a and the ground-connected wall b by means of a crushing mechanism; Negative pressure adsorption: under the action of negative pressure, the loose soil in the gap is adsorbed and discharged to the outside of the equipment, and collected and processed through pipes or containers; Put in the steel cage, make a qualified steel cage and place it between the ground-connected wall a and the ground-connected wall b; Pouring and curing, pouring concrete into the steel cage, forming a sandwich wall after the concrete solidifies, and the height of the sandwich wall is lower than the breaking line of the ground-connected wall a and the ground-connected wall b.

7. The method for connecting a new station with an existing station according to claim 6, characterized in that: Concrete cushion layers are constructed on the top of the ground-connected wall a and the ground-connected wall b, and the upper surfaces of the concrete cushion layers are polished; a water collection tank is constructed on one side of the newly built station B or the existing station A; The bottom surface waterproofing treatment includes the following steps: a. Install a drainage ditch on the top of the mezzanine wall and pour the first layer of concrete around the drainage ditch; b. After the first layer of concrete is solidified, a first casting is formed, and an expansion joint is reserved in the middle position above the first casting, and a waterproof interlayer is arranged on both sides above the first casting; c. Pour a second layer of concrete on the waterproof interlayer, and after the second layer of concrete is solidified, a second casting is formed, and at least two layers of embedded waterstop are arranged on the second casting; d. Pour concrete above the topmost embedded waterstop, and after the concrete is solidified, a third casting is formed, and the third casting is trimmed to be flush with the plane where the station hall layer is located.

8. The method for connecting a new station with an existing station according to claim 7, characterized in that: A drainage ditch is arranged along the length direction of the sandwich wall, the drainage ditch is set at a slope of 0.5% to 2%, and the drainage ditch is connected to the water collecting trough; pebbles are filled into the drainage ditch so that the pebbles are flush with the top of the drainage ditch, concrete is poured on the top of the sandwich wall, and after the concrete is solidified, a first casting body is formed, and the first casting body is flush with the upper surface of the drainage ditch; when pouring the second and third layers of concrete, grouting is also included under the embedded waterstop using a grouting conduit.

9. The method for connecting a new station with an existing station according to claim 7, characterized in that: The waterproof interlayer comprises an additional waterproof layer and a water-stopping tape, and the additional waterproof layer is coated on the upper surface of the first cast body; A plurality of adsorption holes are provided on both sides of the waterstop tape, and the waterstop tape is adhered to the concrete cushion layer through the adsorption holes. One end of the waterstop tape is adhered to the concrete cushion layer in a folded form, and the other end of the waterstop tape extends to the drainage groove and fits against the inner wall of the drainage groove.

10. The method for connecting a new station to an existing station according to any one of claims 1 to 9, characterized in that: After the connection between the concourses of the existing station A and the newly built station B is completed, the temporary supports will be removed and the tops of the existing station A and the newly built station B will be covered with soil.

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