A construction method for connecting a new station with an existing station

Abstract

This invention relates to a construction method for connecting a new station with an existing station. The main structure of the existing station A and the new station B includes a diaphragm wall formed during their respective excavation phases. The existing station A has an overburden layer on its concourse top surface, while the new station B has a construction trestle on its concourse top surface. To facilitate transfers between the two stations, a segmented demolition method and a reinforced concrete frame are used for the connection. The reinforced concrete frame is anchored to the main station structure using rebar installation. During the demolition of the side walls and underground walls of the existing station A, measures such as unloading the overburden, constructing a drainage system, and providing temporary supports for the concourse level are implemented. These measures ensure the safety of the connection construction between the old and new stations and the structural safety of the existing station A, while successfully achieving the transfer connection between the two stations. Furthermore, this method solves the problem of water seepage at the connection point between the existing station A and the new station B, which can affect the overall performance of the stations.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and specifically to a construction method for connecting a newly built station with an existing station. Background Technology

[0002] The construction of subways has become one of the effective ways to solve modern transportation problems. With the continuous increase in 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 at different stages inevitably involve the connection between the newly built subway stations and the existing subway stations. When designing the subway stations to be built first, designers will generally reserve transfer interfaces to facilitate the design and construction of subsequent stations.

[0003] Due to the rapid pace of modern urban development, subway networks are constantly being adjusted. Sometimes, transfer stations appear even without pre-planned transfer structures. In such projects, failure to implement measures to control deformation of existing stations or remove existing structures will have extremely adverse effects on the safety of existing subway stations. For example, in water-rich soft soil areas, existing stations may be in normal operation with relatively stable structural settlement. However, differential settlement can easily occur between the new and existing stations. If later construction encounters large lateral spans in connecting passages and complex surrounding environments, even slight deficiencies in the connection design and construction can lead to irreversible damage to the existing station structure. This can also cause water seepage at the station connections. Long-term immersion and corrosion, or the combined effects of uneven settlement and soil freeze-thaw cycles between the new underground passages and existing stations, can damage the waterproofing at the connection points. Repeated failures over time will cause the connection points to gradually expand and deteriorate, affecting the overall performance of the station.

[0004] Therefore, the inventors have proposed a construction method for connecting new stations with existing stations. Summary of the Invention

[0005] One objective of this invention is to provide a construction method for connecting a new station with an existing station, in order to solve the problem of unsafe connection between an existing station and a new station when no transfer structure is reserved; another objective is to solve the problem that water seepage easily occurs at the connection point between the existing station and the new station, affecting the overall performance of the station.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A construction method for connecting a new station with an existing station, including an existing station A on Line A and a newly built station B on Line B, includes the following steps:

[0008] S1: Excavate the top surface of the existing station A to unload the topsoil layer, construct the water retaining wall and drainage ditch;

[0009] S2: The segmented demolition method is used to construct part of the ground wall of the new station B to form the first passage. The lowest demolition line of the new station B is lower than the plane of the station hall.

[0010] S3: Construct the first frame structure above the first passage and set up temporary supports within the existing station A;

[0011] S4: The segmented demolition method is used to construct part of the ground wall of the existing station A to form a second passage. The first passage corresponds to the second passage, and the lowest demolition line of the existing station A is lower than the plane of the station hall.

[0012] S5: Construct a second frame structure above the second channel, and perform top surface waterproofing treatment on the first frame structure and the second frame structure;

[0013] S6: Connect the existing station A and the newly built station B and waterproof the bottom surface. Use a layered pouring method to fill the connection. After the top layer of concrete has cured, trim it to be flush with the plane of the station hall.

[0014] Furthermore, the existing station A includes a diaphragm wall a, and the newly built station B includes a diaphragm wall b;

[0015] The diaphragm wall b is divided into three areas to be cut: b1, b2, and b3. First, areas b1 and b3 on both sides are broken, then the middle area b2 is broken. The following steps are used to break each area of ​​the diaphragm wall b:

[0016] S21: Erect scaffolding around the area to be cut in diaphragm wall b as a construction platform and support structure;

[0017] S22: Perform measurement, positioning, and marking according to design requirements;

[0018] S23: Use a water drill to continuously drill two rows of holes around the tangent, and use a wire saw to cut the marked area;

[0019] S24: Remove and clean the corners and edges, retain the reinforcing bars extending from the diaphragm wall b, and check the structural stability;

[0020] S25: Repeat steps S21 to S24.

[0021] Furthermore, in step S3, constructing the first framework structure includes the following steps:

[0022] S31: Erecting templates;

[0023] S32: Install and tie the reinforcing bars on the top of the newly built station B, and reserve a rebar connector;

[0024] S33: After the formwork and steel reinforcement binding are inspected and approved, concrete is poured and cured to form frame beams, columns and cantilever structures. The frame beams, columns and cantilever structures are connected to the top of the new station B by rebar installation.

[0025] Further, in step S4, the diaphragm wall a is divided into three areas to be cut: a1, a2, and a3. The areas a1 and a3 on both sides are broken first, and then the middle area a2 is broken. The following steps are used to break each area of ​​the diaphragm wall a:

[0026] S41: Erect scaffolding around the area of ​​the diaphragm wall to be removed, serving as a construction platform and supporting structure;

[0027] S42: Perform measurement, positioning, and marking according to design requirements;

[0028] S43: Use a water drill to continuously drill two rows of holes around the tangent, and use a wire saw to cut the marked area;

[0029] S44: Remove and clean the corners and edges, retain the reinforcing bars extending from the diaphragm wall a, and check the structural stability;

[0030] S45: Repeat steps S41 to S44.

[0031] Furthermore, after the diaphragm wall a and diaphragm wall b are demolished, the cross-section of the demolition line at the top of diaphragm wall a and diaphragm wall b has a stepped structure; or

[0032] The cross-sections of the breaking lines at the top of the diaphragm wall a and the diaphragm wall b are inclined toward the side that is closer to each other.

[0033] Furthermore, the gap between the diaphragm wall a and the diaphragm wall b shall not exceed 3m;

[0034] This also includes the construction of the gap between diaphragm wall a and diaphragm wall b, using the following steps:

[0035] Loosen the soil by using a crushing mechanism to loosen the soil between the diaphragm wall a and the diaphragm wall b;

[0036] Negative pressure adsorption involves adsorbing loose soil within the gaps under negative pressure and expelling it outside the equipment for collection and treatment via pipes or containers.

[0037] Place the steel cage in, make a qualified steel cage and place it between diaphragm wall a and diaphragm wall b;

[0038] The concrete is poured into the reinforcing cage for pouring and curing. After the concrete has solidified, it forms a sandwich wall. The height of the sandwich wall is lower than the demolition line of diaphragm wall a and diaphragm wall b.

[0039] Furthermore, a concrete cushion layer is constructed on top of diaphragm wall a and diaphragm wall b, and the upper surface of the concrete cushion layer is smoothed; a water collection trough is constructed on one side of the new station B or the existing station A.

[0040] The bottom waterproofing treatment includes the following steps: a. Install drainage channels at the top of the mezzanine wall and pour the first layer of concrete around the drainage channels; b. After the first layer of concrete has cured, a first pouring body is formed, and an expansion joint is reserved in the middle position above the first pouring body. At the same time, waterproof interlayers are arranged on both sides above the first pouring body; c. Pour a second layer of concrete on the waterproof interlayer. After the second layer of concrete has cured, a second pouring body is formed. At least two layers of embedded waterstops are arranged on the second pouring body; d. Pour concrete above the top embedded waterstop. After the concrete has cured, a third pouring body is formed. Trim the third pouring body to be flush with the plane of the station hall floor.

[0041] Furthermore, a drainage ditch is arranged along the length of the interlayer wall, with a slope of 0.5% to 2%, and the drainage ditch is connected to the water collection ditch; pebbles are filled into the drainage ditch so that the pebbles are flush with the top of the drainage ditch, and concrete is poured onto the top of the interlayer wall. After the concrete has cured, a first casting body is formed, which is flush with the upper surface of the drainage ditch; when pouring the second and third layers of concrete, grouting is also performed below the embedded waterstop using a grouting pipe.

[0042] Furthermore, the waterproof interlayer includes an additional waterproof layer and a water-stopping tape, wherein the additional waterproof layer is coated on the upper surface of the first cast body;

[0043] The water-stop roll has several adsorption holes on both sides. The water-stop roll is attached to the concrete pad through the adsorption holes. One end of the water-stop roll is attached to the concrete pad in a folded form. The other end of the water-stop roll extends to the drainage groove and is attached to the inner wall of the drainage groove.

[0044] Furthermore, after the connection between 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.

[0045] The beneficial effects of this invention are:

[0046] This invention employs a segmented demolition method and the construction of reinforced concrete frame beams for reconstruction and connection. The first and second frame structures are anchored to the main structure of the station using rebar anchoring. When demolishing the diaphragm wall of the existing station A, measures such as overlaying soil for unloading, constructing a drainage system, and providing temporary support for the concourse level were adopted. These measures ensured the safety of the construction of the new station B and the structural safety of the existing station A, while successfully achieving the transfer connection between the new station B and the adjacent existing station A.

[0047] This invention employs a segmented demolition method when breaking down diaphragm walls, which helps control stress changes during construction, reduces the impact on existing structures, and improves construction safety.

[0048] A concrete pad is constructed on top of diaphragm walls a and b, with a refined smooth finish at the joints. This allows for proper adhesion of the water-stop roll. The water-stop roll has several suction holes on both sides, through which it adheres to the concrete pad. One end of the roll is folded and attached to the concrete pad, while the other end extends into the drainage channel and adheres to its inner wall. Through the vacuum suction of the suction holes, the water-stop roll adheres tightly to the concrete pad, reducing the risk of leakage due to gaps or loosening. This adhesion method helps form an effective waterproof barrier, preventing water penetration. Simultaneously, the water-stop roll possesses a certain degree of flexibility and elasticity, adapting to minor deformations in the concrete pad caused by temperature changes and foundation settlement, further maintaining a tight bond between the water-stop roll and the concrete pad and preventing leakage due to deformation. One end of the water-stop roll is folded and attached to the concrete subbase, while the other end extends into the drainage channel and adheres to the inner wall. This installation method enhances the stability of the water-stop roll, preventing it from detaching or shifting due to external forces during construction. The water-stop roll not only stops water but also integrates with the drainage system through its extension into the drainage channel. This ensures that even if water seeps through the concrete subbase, it can be promptly guided to the drainage channel and discharged, thus providing dual protection against both drainage and leakage.

[0049] Other advantages, objectives, and features of this application will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from practice of this application. The objectives and other advantages of this application may be realized and obtained through the detailed embodiments described below. Attached Figure Description

[0050] Figure 1 This is a schematic diagram illustrating the state when the newly built station and the existing station are not connected in the construction method for connecting the newly built station and the existing station according to the present invention.

[0051] Figure 2 This is a schematic diagram of the state of the diaphragm wall b being excavated in the construction method for connecting a new station with an existing station according to the present invention.

[0052] Figure 3 This is a schematic diagram showing the state of excavation of the diaphragm wall a and the erection of temporary supports in the construction method for connecting a new station with an existing station according to the present invention.

[0053] Figure 4 This is a schematic diagram of the structure after the excavation of the diaphragm wall a is completed in the construction method for connecting a new station and an existing station according to the present invention;

[0054] Figure 5 This is a schematic diagram of the structure after the construction of the first frame structure and the second frame structure in the construction method for connecting a new station and an existing station according to the present invention.

[0055] Figure 6 This is a schematic diagram of the structure after the connection between the newly built station and the existing station according to the present invention;

[0056] Figure 7 This is a cross-sectional schematic diagram showing the disconnect between the newly built station and the existing station according to the present invention;

[0057] Figure 8 This is a schematic diagram of the connection between the newly built station and the existing station according to the present invention;

[0058] Figure 9 This is a schematic diagram of the connection between the newly built station and the existing station and the bottom waterproofing treatment structure according to the present invention.

[0059] Figure 10 This invention relates to the connection between newly built stations and existing stations. Figure 9 A schematic diagram of the C-section structure;

[0060] Figure 11 This is a schematic diagram of the structure when the concrete cushion layer and the water-stopping roll are connected together according to the present invention.

[0061] Figure 12 This is a schematic diagram of the structure when the concrete pad and the water-stopping tape of the present invention are separated.

[0062] Among them, the soil cover layer 1, water retaining wall 2, drainage ditch 3, first passage 4, second passage 5, station hall 6, first frame structure 7, second frame structure 8, temporary support 9, concrete cushion layer 10, water collection trough 11, drainage trough 12, first cast-in-place body 13, waterproof interlayer 14, additional waterproof layer 141, water-stopping tape 142, adsorption hole 1421, second cast-in-place body 15, embedded water-stopping tape 16, third cast-in-place body 17, cobblestones 18, interlayer wall 19, and grouting pipe 20. Detailed Implementation

[0063] The embodiments of the present invention will be described below 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 content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed 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 and not for limiting the scope of protection of the present invention.

[0064] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0065] This embodiment proposes a construction method for connecting a newly built station with an existing station, such as... Figures 1 to 12 As shown, this includes existing station A on Line A and newly built station B on Line B, and involves the following steps:

[0066] S1: Excavate the top surface of the existing station A, unload the topsoil layer 1, construct the water retaining wall 2 and drainage ditch 3;

[0067] Using excavators and other mechanical equipment, excavation work was carried out according to the design plan, gradually unloading the top layer 1 of the existing station A on Line A; the foundation of the water-retaining sill 2 was constructed according to the design requirements, ensuring the foundation was stable, and the water-retaining sill 2 was constructed using suitable materials (such as concrete, bricks, etc.), ensuring that the height, width, and strength of the water-retaining sill 2 met the design requirements; Figure 1 and Figure 8 As shown, after excavating the top layer 1 of the existing station A, the left side of the top layer 1 is inclined. Unloading the top 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 top layer 1. The setting of the drainage ditch 3 can avoid water accumulation and avoid affecting subsequent construction operations. The water retaining wall 2 is set on the top surface of the existing station A after the top layer is excavated to effectively block the entry of external water sources. Both the construction water retaining wall 2 and the drainage ditch 3 can effectively block the entry of external water sources, which is conducive to the progress of subsequent construction.

[0068] S2: The segmented demolition method is used to construct part of the ground wall of the new station B to form the first passage 4. The lowest demolition line of the new station B is lower than the plane of the station hall level 6.

[0069] like Figure 1As shown, existing station A includes diaphragm wall a, and newly built station B includes diaphragm wall b. In this invention, diaphragm walls a and b need to be broken down in sections to achieve the connection between the concourse level 6 of existing station A and the concourse level 6 of newly built station B. Specifically, in conjunction with... Figure 1 , Figure 2 and Figure 8 As shown, the diaphragm wall b is divided into three areas to be cut: b1, b2, and b3. Areas b1 and b3 on both sides are removed first, followed by the middle area b2. Since the diaphragm wall b is a continuous structure, stress and deformation are easily generated during partial demolition. This invention, by first removing the two side areas (b1 and b3), can gradually release and disperse these stresses and deformations, reducing the impact on the middle area (b2) and surrounding structures. Removing the two side areas (b1 and b3) first provides a more stable and safer operating environment for the construction of the middle area (b2). Simultaneously, if problems arise during the demolition of the middle area (b2), the removed areas on both sides can also serve as emergency passages or supporting structures, facilitating timely evacuation and handling by construction personnel. During the cutting process, precise measurement and positioning, as well as the use of professional cutting tools (such as water drills and wire saws), can ensure the accuracy of the cutting line and the flatness of the cutting surface. Removing the two sides first can reduce the direct impact and damage to the middle area and surrounding structure, protecting 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, so as to make full use of resources and time and improve construction efficiency.

[0070] The following steps are used to dismantle each area of ​​the diaphragm wall b:

[0071] S21: Erect scaffolding around the area to be removed from diaphragm wall b as a construction platform and support structure; First, design and erect a stable scaffolding system according to the size and shape of the area to be removed from diaphragm 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 facilitate the operation of construction personnel and take into account the smooth progress of subsequent construction steps.

[0072] S22: Conduct measurement, positioning, and marking according to design requirements; after the scaffolding is erected, use high-precision measuring instruments (such as total station, laser rangefinder, etc.) to accurately measure the area to be cut, and mark the accurate cutting boundary line on the diaphragm wall according to the design drawings, marking the position of the reinforcing bars to be retained and the key structural points for subsequent construction reference.

[0073] S23: A water drill is used to continuously drill double rows of holes around the tangent line, and a wire saw is used to cut the marked area; after the marking is completed, a water drill is used to continuously drill double rows of holes around the tangent line, and the structural wall is divided into blocks with a horizontal cut spacing of 1.5m and a vertical cut spacing of 1m, and cut layer by layer from top to bottom. The present invention uses a combination of water drill and wire saw to reduce cutting noise and vibration during construction, thereby reducing interference with the existing operating station A.

[0074] S24: Chisel and clean the edges and corners, retaining the reinforcing bars extending from the diaphragm wall (b) and checking the structural stability. After cutting, use tools such as pneumatic picks and hammers to carefully chisel away the edges and corners, taking care to protect the reinforcing bars and surrounding structure during the chiseling process. After chiseling, thoroughly clean the cut area, removing any remaining concrete fragments, rebar ends, and other debris. At the same time, organize and protect the retained reinforcing bars to prevent damage during subsequent construction. The retained reinforcing bars can serve as support and reinforcement for the new wall panels, increasing the overall strength and stability of the wall. In subsequent wall construction, the reinforcing bars will be firmly embedded in the concrete, working together with the concrete to form a robust wall structure.

[0075] S25: Repeat steps S21 to S24.

[0076] like Figure 4 and Figure 5 As shown, S3: Construct a first frame structure 7 above the first passage 4 and set up temporary supports 9 inside the existing station A; Construct a stable first frame structure 7 above the first passage 4 to cope with possible load changes during construction; Ensure the safety of the construction connection between the new station B and the existing station A. Set up temporary supports 9 inside the existing station A. The temporary supports 9 can share part of the load borne by the existing station A during construction, reduce the burden on the existing structure, and effectively enhance the structural stability of the existing station A during construction, preventing structural deformation or damage caused by construction loads or other external forces.

[0077] Furthermore, constructing the first framework structure 7 includes the following steps:

[0078] S31: Formwork Erection; During this stage, the formwork positions must be accurately measured and positioned according to the design drawings. High-strength, corrosion-resistant formwork materials, such as steel formwork or bamboo plywood, must be used to ensure a smooth surface and tight joints. Simultaneously, the formwork support system must be strengthened using stable structures such as steel pipe scaffolding or portal frames to ensure that the formwork does not deform or shift during concrete pouring.

[0079] S32: Rebar is installed and tied to the top of the newly constructed station B, with rebar connectors provided. This invention involves installing rebar on the top of the newly constructed station B, precisely drilling holes according to design requirements, injecting high-performance anchoring adhesive, and then inserting the rebar into the holes to ensure a tight bond between the rebar and the existing concrete structure. Simultaneously, the inserted rebar is tied to form a stable rebar skeleton. Furthermore, sufficient rebar connectors must be provided for subsequent connection to the rebar of the first frame structure 7, ensuring the structural integrity and continuity.

[0080] S33: After the formwork and rebar binding have passed inspection, concrete will be poured. After curing, it will form frame beams, columns, and cantilever structures. The frame beams, columns, and cantilever structures will be connected to the top of the new station B through rebar anchoring. After the formwork and rebar binding are completed and pass strict inspection, concrete pouring can begin. During the pouring process, the pouring speed and vibration intensity must be controlled. Once the concrete reaches the design strength, it will form a stable frame beam, columns, and cantilever structure. These structures will not only bear the loads of the first passage 4 and subsequent construction, but will also be tightly connected to the top of the new station B through rebar anchoring, forming an integrated load-bearing system.

[0081] S4: The segmented demolition method is used to construct part of the ground wall of the existing station A to form the second passage 5. The first passage 4 corresponds to the second passage 5, and the lowest demolition line of the existing station A is lower than the plane where the concourse level 6 is located.

[0082] Furthermore, in step S4, the diaphragm wall a is divided into three areas to be cut: a1, a2, and a3. The areas a1 and a3 on both sides are removed first, and then the middle area a2 is removed. Since the diaphragm wall a is a continuous structure, it is prone to stress and deformation during partial demolition. By first removing the two side areas (a1 and a3), this invention can gradually release and disperse these stresses and deformations, reducing the impact on the middle area (a2) and the surrounding structure. After the two side areas (a1 and a3) are removed first, a more stable and safe operating environment can be provided for the construction of the middle area (a2).

[0083] The following steps are used to dismantle each area of ​​the diaphragm wall a:

[0084] S41: Erect scaffolding around the area of ​​the diaphragm wall to be removed, serving as a construction platform and supporting structure;

[0085] S42: Perform measurement, positioning, and marking according to design requirements;

[0086] S43: Use a water drill to continuously drill two rows of holes around the tangent, and use a wire saw to cut the marked area;

[0087] S44: Remove and clean the corners and edges, retain the reinforcing bars extending from the diaphragm wall a, and check the structural stability;

[0088] S45: Repeat steps S41 to S44.

[0089] S5: Construct a second frame structure 8 above the second channel 5, and perform top surface waterproofing treatment on the first frame structure 7 and the second frame structure 8; In this invention, the construction of the second frame structure 8 is similar to the construction of the first frame structure 7 described above, and will not be repeated here.

[0090] S6: Connect the existing station A and the newly built station B and waterproof the bottom surface. Use a layered pouring method to fill the connection. After the concrete at the top layer has cured, trim it to be flush with the plane of station hall level 6.

[0091] Furthermore, after the demolition of diaphragm walls a and b, the cross-section of the demolition line at the top of diaphragm walls a and b has a stepped structure; or the cross-section of the demolition line at the top of diaphragm walls a and b is inclined towards each other. Using a stepped structure increases the contact area after the demolition of the tops of diaphragm walls a and b, thereby enhancing the horizontal stability of the structure, helping to resist external loads, and reducing stress concentration caused by demolition. Moreover, the stepped structure provides a more stable support surface for subsequent construction operations (such as installing drainage channels 12, waterproofing, etc.), and construction workers can work more safely on the steps, minimizing damage to diaphragm walls a and b themselves and their surrounding structures. This helps protect the integrity and stability of the original structure and reduces the amount of repair and reinforcement work. This invention also includes the construction of the gap between diaphragm wall a and diaphragm wall b. Since the new station B is adjacent to the existing station A, and the gap between diaphragm wall a and diaphragm wall b is no more than 3m, the limited distance between them makes traditional excavation unsuitable for construction, hindering close-range implementation and posing significant construction challenges. This invention employs loose soil and negative pressure adsorption methods for implementation. The specific implementation method is as follows:

[0092] Loosen the soil by using a crushing mechanism to loosen the soil between diaphragm wall a and diaphragm wall b; use the crushing mechanism to precisely crush the soil between diaphragm wall a and diaphragm wall b, and control the crushing force and depth to avoid damage to the surrounding diaphragm walls.

[0093] In one possible implementation, vibration or water jet-assisted technology can also be used to improve the loosening effect and reduce dust.

[0094] Negative pressure adsorption, under negative pressure, adsorbs loose soil in the gaps and removes it to the outside of the equipment, where it is collected and treated through pipes or containers. During or after the loosening process, the negative pressure adsorption device is immediately activated, and the loose soil and fine particles in the gaps are quickly adsorbed through a high-efficiency dust collection pipe and transported to a dedicated collection container or treatment system. It has a compact structure and is easy to implement.

[0095] Place the steel cage in, make a qualified steel cage and place it between diaphragm wall a and diaphragm wall b;

[0096] The process involves pouring concrete into the steel cage for curing. After the concrete hardens, a sandwich wall 19 is formed. The sandwich wall 19 formed by pouring concrete can connect the existing station A and the newly built station B, facilitating the subsequent connection between the two stations.

[0097] The height of the mezzanine wall 19 is lower than the breach lines of diaphragm walls a and b. By employing crushing and adsorption methods, damage and interference to the surrounding diaphragm walls are effectively reduced, ensuring a good connection between the mezzanine wall 19 and the diaphragm walls. Simultaneously, the use of a steel cage and concrete pouring improves the overall quality and durability of the mezzanine wall 19. The application of negative pressure adsorption significantly reduces dust and waste emissions during construction, lowering environmental pollution. Furthermore, the collected and treated loose soil can be further used in other projects or undergo harmless treatment to achieve resource recycling. The height of the mezzanine wall 19 is lower than the breach lines of diaphragm walls a and b. Diaphragm walls a and b serve as waterproof barriers in the underground structure, and their waterproofing performance is crucial. The lower height of the mezzanine wall 19 ensures that the waterproof layer of the diaphragm walls is not damaged during construction, thereby improving the overall waterproofing effect of the underground structure. Meanwhile, the gaps between the interlayer wall 19 and the diaphragm walls a and b can be sealed by waterproofing measures to reduce the risk of groundwater or other liquids leaking through the gaps.

[0098] Furthermore, such as Figure 9 and Figure 10 As shown, a concrete cushion layer 10 is constructed on top of diaphragm walls a and b, and the upper surface of the concrete cushion layer 10 is smoothed. In this invention, the concrete cushion layer 10, constructed on top of diaphragm walls a and b, serves as a connecting layer between the diaphragm walls, significantly improving the overall stability of the underground structure, effectively dispersing and transferring loads, and reducing structural deformation and damage caused by uneven settlement of the foundation of the new station B or other external factors. Furthermore, before the concrete initially sets, the upper surface of the concrete cushion layer 10 is smoothed using a trowel or mechanical tools, which improves the density and impermeability of the concrete cushion layer 10, effectively preventing groundwater or other liquids from seeping into the interior of the underground structure. At the same time, the smoothing process also facilitates the subsequent installation of the waterproof interlayer 14.

[0099] like Figure 10 As shown, a water collection tank 11 is constructed on one side of the newly built station B or the existing station A; the water collection tank 11 is used to temporarily store groundwater and then store leaked groundwater.

[0100] The bottom waterproofing treatment includes the following steps: a. Install a drainage trough 12 on the top of the interlayer wall 19 and pour the first layer of concrete around the drainage trough 12; specifically, the drainage trough 12 is arranged along the length of the interlayer wall 19, with a slope of 0.5% to 2%, and is connected to the water collection trough 11 for drainage; fill the drainage trough 12 with pebbles 18 so that the pebbles 18 are flush with the top of the drainage trough 12, and the gaps between the pebbles 18 can provide a good seepage channel, so that water can flow more smoothly through the drainage trough 12. This natural drainage method helps to reduce water accumulation and is less likely to form a film or blockage, thereby keeping the drainage trough 12 unobstructed for a long time; pour concrete on the top of the interlayer wall 19, and after the concrete has cured, form a first casting body 13, which is flush with the upper surface of the drainage trough 12.

[0101] b. After the first layer of concrete has cured, a first pouring body 13 is formed, and an expansion joint is reserved in the middle position above the first pouring body 13. At the same time, a waterproof interlayer 14 is arranged on both sides above the first pouring body 13. The waterproof interlayer 14 includes an additional waterproof layer 141 and a water-stopping roll 142. The additional waterproof layer 141 is coated on the upper surface of the first pouring body 13.

[0102] like Figure 12As shown, the water-stop roll 142 has several adsorption holes 1421 on both sides. The water-stop roll 142 is attached to the concrete pad 10 through the adsorption holes 1421. One end of the water-stop roll 142 is folded and attached to the concrete pad 10, while the other end extends to the drainage groove 12 and adheres to the inner wall of the drainage groove 12. Through the vacuum adsorption effect of the adsorption holes 1421, the water-stop roll 142 can be tightly attached to the concrete pad 10, reducing the risk of leakage caused by gaps or looseness. This bonding method helps to form an effective waterproof barrier and prevent water penetration. At the same time, the water-stop roll 142 has a certain degree of flexibility and elasticity, which can adapt to the slight deformation of the concrete pad 10 caused by temperature changes, foundation settlement, etc., which helps to maintain a tight fit between the water-stop roll 142 and the concrete pad 10 and prevent leakage problems caused by deformation. One end of the water-stopping roll 142 is folded and attached to the concrete pad 10, while the other end extends to the drainage channel 12 and adheres to its inner wall. This installation method enhances the stability of the water-stopping roll 142, preventing it from falling off or shifting due to external forces during construction. The water-stopping roll 142 not only serves to stop water but also integrates with the drainage system through its extension to the drainage channel 12. Thus, even if water seeps through the concrete pad 10, it can be promptly guided to the drainage channel 12 and discharged, achieving a dual guarantee of drainage and leak prevention.

[0103] c. Pour a second layer of concrete on the waterproof interlayer 14. After the second layer of concrete has cured, a second pouring body 15 is formed. At least two layers of embedded waterstops 16 are arranged on the second pouring body 15. d. Pour concrete above the top embedded waterstop 16. After the concrete has cured, a third pouring body 17 is formed. Trim the third pouring body 17 to be flush with the plane of the station hall level 6.

[0104] A second layer of concrete is poured on the waterproof interlayer 14. This step aims to strengthen the structural strength of the waterproof interlayer 14 and provide a stable base for further construction. The cured second pouring body 15 provides a solid foundation for the subsequent arrangement of waterstops. At least two layers of embedded waterstops 16 are arranged on the second pouring body 15. Even if one layer of waterstop is damaged or fails, the other layers can still effectively prevent water penetration. The function of the embedded waterstops 16 is to prevent water penetration and protect the building structure from water damage. The use of two or more layers of waterstops in this invention increases the redundancy of waterproofing and improves the waterproofing effect. Concrete is poured on top of the top embedded waterstop 16. After the concrete cures, a third pouring body 17 is formed, which strengthens the connection strength between the existing station A and the newly built station B, as well as the integrity and stability of the waterproof structure. The third pouring body 17 is then trimmed to be flush with the plane of the station hall level 6. This 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.

[0105] When pouring the second and third layers of concrete, grouting is also performed below the embedded waterstop 16 using the grouting pipe 20.

[0106] When the second and third layers of concrete have initially set, grouting can fill the tiny gaps between the embedded waterstop 16 and the concrete, further enhancing the waterproof seal. Since concrete inevitably has gaps (such as concrete shrinkage, temperature changes, etc.), which are often potential channels for water penetration, grouting can effectively seal these channels and prevent water penetration. Grouting can also promptly detect and repair these potential defects, preventing them from developing into serious leakage problems. This solves the problem of water seepage easily occurring at the connection point between the existing station A and the newly built station B, which affects the overall performance of the station.

[0107] After the connection between the existing station A and the newly built station B at the concourse level 6 is completed, the temporary support 9 will be removed, and the tops of the existing station A and the newly built station B will be covered with soil to restore traffic.

[0108] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A construction method for connecting a newly built station with an existing station, comprising an existing station A on Line A and a newly built station B on Line B, characterized in that, This includes implementing the following steps: S1: Excavate the top surface of the existing station A to unload the topsoil layer, construct the water retaining wall and drainage ditch; S2: The segmented demolition method is used to construct part of the ground wall of the new station B to form the first passage. The lowest demolition line of the new station B is lower than the plane of the station hall. S3: Construct the first frame structure above the first passage and set up temporary supports within the existing station A; S4: The segmented demolition method is used to construct part of the ground wall of the existing station A to form a second passage. The first passage corresponds to the second passage, and the lowest demolition line of the existing station A is lower than the plane of the station hall. S5: Construct a second frame structure above the second channel, and perform top surface waterproofing treatment on the first frame structure and the second frame structure; S6: Connect the existing station A and the newly built station B and waterproof the bottom surface. Use a layered pouring method to fill the connection. After the top layer of concrete has cured, trim it to be flush with the plane of the station hall. The existing station A includes a diaphragm wall a, and the newly built station B includes a diaphragm wall b; The diaphragm wall b is divided into three areas to be cut: b1, b2, and b3. First, areas b1 and b3 on both sides are broken, then the middle area b2 is broken. The following steps are used to break each area of ​​the diaphragm wall b: S21: Erect scaffolding around the area to be cut in the diaphragm wall b as a construction platform and support structure; S22: Perform measurement, positioning, and marking according to design requirements; S23: Use a water drill to continuously drill two rows of holes around the tangent, and use a wire saw to cut the marked area; S24: Remove and clean the corners and edges, retain the reinforcing bars extending from the diaphragm wall b, and check the structural stability; S25: Repeat steps S21 to S24; In step S3, constructing the first framework structure includes the following steps: S31: Erecting templates; S32: Install and tie the reinforcing bars on the top of the newly built station B, and reserve a rebar connector; S33: After the formwork and steel reinforcement binding are inspected and approved, concrete is poured and cured to form frame beams, columns and cantilever structures. The frame beams, columns and cantilever structures are connected to the top of the new station B by rebar anchoring. Concrete pads are constructed on top of diaphragm wall a and diaphragm wall b, and the upper surface of the concrete pads is smoothed; a water collection trough is constructed on one side of the new station B or the existing station A. The bottom waterproofing treatment includes the following steps: a. Install drainage channels at the top of the mezzanine wall and pour the first layer of concrete around the drainage channels; b. After the first layer of concrete has cured, a first pouring body is formed, and an expansion joint is reserved in the middle position above the first pouring body. At the same time, waterproof interlayers are arranged on both sides above the first pouring body; c. Pour a second layer of concrete on the waterproof interlayer. After the second layer of concrete has cured, a second pouring body is formed. At least two layers of embedded waterstops are arranged on the second pouring body; d. Pour concrete above the top embedded waterstop. After the concrete has cured, a third pouring body is formed. Trim the third pouring body to be flush with the plane of the station hall floor. A drainage ditch is arranged along the length of the interlayer wall, with a slope of 0.5% to 2%, and is connected to the water collection ditch. Pebbles are filled into the drainage ditch so that the pebbles are flush with the top of the drainage ditch. Concrete is poured onto the top of the interlayer wall, and after the concrete has cured, a first poured body is formed, which is flush with the upper surface of the drainage ditch. During the pouring of the second and third layers of concrete, grouting is also performed below the embedded waterstop using a grouting pipe. The waterproof interlayer includes an additional waterproof layer and a water-stopping tape, wherein the additional waterproof layer is coated on the upper surface of the first cast body; The water-stop roll has several adsorption holes on both sides. The water-stop roll is attached to the concrete pad through the adsorption holes. One end of the water-stop roll is attached to the concrete pad in a folded form. The other end of the water-stop roll extends to the drainage groove and is attached to the inner wall of the drainage groove.

2. The construction method for connecting a newly built station with an existing station according to claim 1, characterized in that: In step S4, the diaphragm wall a is divided into three areas to be cut: a1, a2, and a3. Areas a1 and a3 on both sides are broken first, followed by the middle area a2. The following steps are used to break each area of ​​the diaphragm wall a: S41: Erect scaffolding around the area of ​​the diaphragm wall to be removed, serving as a construction platform and supporting structure; S42: Perform measurement, positioning, and marking according to design requirements; S43: Use a water drill to continuously drill two rows of holes around the tangent, and use a wire saw to cut the marked area; S44: Remove and clean the corners and edges, retain the reinforcing bars extending from the diaphragm wall a, and check the structural stability; S45: Repeat steps S41 to S44.

3. The construction method for connecting a newly built station with an existing station according to claim 2, characterized in that: After the diaphragm wall a and diaphragm wall b are demolished, the cross-section of the demolition line at the top of diaphragm wall a and diaphragm wall b has a stepped structure; or The cross-sections of the breaking lines at the top of the diaphragm wall a and the diaphragm wall b are inclined toward the side that is closer to each other. The gap between diaphragm wall a and diaphragm wall b shall not exceed 3m; This also includes the construction of the gap between diaphragm wall a and diaphragm wall b, using the following steps: Loosen the soil by using a crushing mechanism to loosen the soil between the diaphragm wall a and the diaphragm wall b; Negative pressure adsorption involves adsorbing loose soil within the gaps under negative pressure and expelling it outside the equipment for collection and treatment via pipes or containers. Place the steel cage in, make a qualified steel cage and place it between diaphragm wall a and diaphragm wall b; The concrete is poured into the reinforcing cage for pouring and curing. After the concrete has solidified, it forms a sandwich wall. The height of the sandwich wall is lower than the demolition line of diaphragm wall a and diaphragm wall b.

4. The construction method for connecting a newly built station with an existing station according to claim 3, characterized in that: After the concourse levels of the existing station A and the newly built station B are connected, 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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