Connecting construction method for connector structure of main body structure and accessory structure of underground station

Abstract

The invention discloses an underground station main body structure and accessory structure interface structure connecting construction method which comprises the following steps: excavating an accessory foundation pit on one side of a main body structure of an underground station, an auxiliary fender pile wall is constructed on the side, opposite to the main body structure, of the auxiliary foundation pit, and an inter-wall support is arranged between the auxiliary fender pile wall and the main body fender pile wall; an accessory structure bottom plate is constructed at the bottom of the accessory foundation pit, and one side of the accessory structure bottom plate sinks to form a bottom plate sinking groove which is connected with the main body enclosure pile wall; an accessory structure side plate is constructed on the other side of the accessory structure bottom plate; a rope saw cutting device is arranged on the accessory structure bottom plate, and a connector is formed through cutting; the cut main body enclosure pile wall is hoisted out; pouring is conducted in the bottom plate sinking groove to form a bottom plate post-pouring belt; and constructing an accessory structure top plate. The connecting construction method for the interface structure of the underground station main body structure and the accessory structure is reasonable in overall procedure design and high in construction efficiency, the construction quality is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering, and in particular to a construction method for connecting an interface structure between a main structure and an auxiliary structure of an underground station. Background Art

[0002] The main structure of an underground station is generally constructed in a separate foundation pit from ancillary structures such as entrances and exits, and wind shelters. The interface between the main structure and the ancillary structure has high safety risks and high construction difficulty. For this type of interface structure connection, the following methods are usually used: 1. After the foundation pit is sealed, manual jackhammers are used to break the common pile wall part of the interface. The vibration caused by its construction has little effect on the structure and waterproofing, but the construction period is long; 2. After the foundation pit is sealed, mechanical demolition of the common pile wall part of the interface is adopted, but the vibration caused by its construction has a greater impact on the structure and waterproofing, and it is difficult to clean up the slag after demolition; 3. After the foundation pit is sealed, a diamond wire saw or a circular saw is used to cut off the common pile wall part of the interface, but a second manual jackhammer is required to break or mechanical demolition of the common pile wall part of the top and bottom plate post-casting zone. Although the vibration caused by its construction has less impact on the structure and waterproofing, the slag still needs to be cleaned up after demolition, and the construction period is long; 4. The common pile wall part of the interface is broken as the foundation pit is excavated, and the construction period is faster, but it has a great impact on the safety of the foundation pit and high risks.

[0003] The existing Chinese patent document with application number CN201910508663.7 discloses a method for constructing a long strip auxiliary structure of an open-cut underground station, which specifically discloses the following steps: Step S1: Leveling the site and completing the construction of the "["-shaped retaining piles and their crown beams of the foundation pit of the auxiliary structure; Step S2: Excavating the foundation pit of the auxiliary structure from top to bottom to the bottom of the pit, and promptly erecting the supporting structure, setting steel purlins on the retaining structure, retaining piles or crown beams as the supporting foundation of the supporting structure; Step S3: According to the plane layout characteristics of the supporting structure , reserve part of the enclosure structure, demolish other enclosure structures, and at the same time construct the cushion layer of the auxiliary structure; step S4: construct part of the bottom plate, side wall, floor plate and top plate of the auxiliary structure in advance in order from bottom to top, and remove the vertical supporting structures in turn, and at the same time, the bottom plate, floor plate and top plate are in the reserved grooves around the reserved enclosure structure; step S5: demolish the reserved enclosure structure, and cast the reserved grooves of the bottom plate, floor plate and top plate; step S6: after the top plate reaches the design strength, backfill the top plate with soil, relocate the municipal pipelines, and complete the construction of the station auxiliary structure. The entire construction process of this open-cut underground station long strip auxiliary structure construction method is to dig the foundation pit, erect the supporting structure, demolish the enclosure to form an interface, construct the interface structure (bottom plate, side wall, floor plate and top plate), and dismantle the supporting structure. It has the following shortcomings:

[0004] 1) The overall process design is unreasonable and the construction efficiency is low;

[0005] 2) First, the enclosure is removed to form the interface and then the interface structure is constructed, which is likely to affect the strength of the main structure and thus affect the overall construction quality;

[0006] 3) It is necessary to erect a supporting structure and then dismantle it after the interface structure is constructed. This not only increases the construction cost, but also makes it difficult to dismantle the supporting structure due to the obstruction of the interface structure.

[0007] 4) The interface enclosure is generally removed by a jackhammer. First, it requires two manual jackhammer removals or mechanical removal of the top and bottom (the pile wall part within the top and bottom plate post-casting zone), which is troublesome to construct and inefficient. Second, a large amount of slag is generated, which increases the time for cleaning the slag. Third, the vibration caused by the construction affects the overall structural strength and waterproofness. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide an interface structure connection construction method for the main structure and auxiliary structure of an underground station with reasonable overall process design, high construction efficiency, improved construction quality and reduced construction cost.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A construction method for connecting an interface structure between a main structure and an auxiliary structure of an underground station comprises the following steps:

[0011] S1. Excavate an auxiliary foundation pit on one side of the main structure of the underground station, construct an auxiliary retaining pile wall on the side of the auxiliary foundation pit facing the main structure, and install inter-wall supports between the auxiliary retaining pile wall and the upper part of the main retaining pile wall on the side of the main structure facing the auxiliary foundation pit;

[0012] S2. Construct the auxiliary structure bottom plate at the bottom of the auxiliary foundation pit, making it flush with the main middle plate of the main structure. Sink the auxiliary structure bottom plate toward one side of the main retaining pile wall to form a bottom plate sinking groove, and connect it to the main retaining pile wall below the main middle plate. Construct the auxiliary structure side plate on the other side of the auxiliary structure bottom plate, making it close to the auxiliary retaining pile wall.

[0013] S3. Install a wire saw cutting device on the base plate of the auxiliary structure, and use the wire saw cutting device to cut an interface on the main retaining pile wall so that the bottom surface of the interface is located below the main body middle plate; and use a lifting device to lift out the cut main retaining pile wall;

[0014] S4. Cast concrete into the bottom plate sinking trough to form a bottom plate post-casting belt, making the bottom plate post-casting belt flush with the main body middle plate; construct the lower lapped beam at the lower part of the main body top plate facing the interface side of the main structure, and construct the auxiliary structure top plate between the top of the auxiliary structure side plate and the bottom of the lower lapped beam.

[0015] As a further improvement of the above technical solution:

[0016] A connecting top beam is preset on the side of the main body top plate facing the interface. In the above S4, the lower lap beam is connected to the connecting top beam.

[0017] The lower lap beam is connected to the stress-bearing steel bars of the top beam by welding or connectors.

[0018] In the above-mentioned S4, connecting steel bars are provided in the bottom plate sinking trough, and the connecting steel bars are connected to the auxiliary structure bottom plate and the main body middle plate through welding or connectors.

[0019] In S3, support piles are reserved in the middle of the interface during the interface cutting and forming process, and the support piles are removed after the construction of the auxiliary structure top plate is completed.

[0020] In the above S4, a top plate post-casting zone is reserved at a position corresponding to the supporting piles on the top plate of the auxiliary structure.

[0021] The inter-wall support includes concrete support and steel support. In S1, the concrete support is arranged between the top of the auxiliary retaining pile wall and the main retaining pile wall, and the steel support is located below the concrete support and is detachably supported between the auxiliary retaining pile wall and the main retaining pile wall.

[0022] After S2 and before S3, remove the steel support.

[0023] In the above S1, an auxiliary crown beam is provided on the top of the auxiliary retaining pile wall, and a main crown beam is provided on the top of the main retaining pile wall, and a concrete support is provided between the auxiliary crown beam and the main crown beam.

[0024] In the above S3, the lifting device is connected to the main retaining pile wall to be cut before the rope saw cutting device cuts.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] The construction method for connecting the interface structure between the main structure and the auxiliary structure of this underground station is as follows: first, the process is to dig the auxiliary foundation pit, construct the auxiliary structure bottom plate, cut the interface with the rope saw cutting equipment, and construct the main top plate. The overall process design is reasonable and the construction efficiency is high. Second, the auxiliary structure bottom plate is constructed first and then the interface is cut. During the cutting process, the strength of the main structure is improved under the support of the auxiliary structure bottom plate, thereby improving the construction quality. Third, there is no need to erect a supporting structure, which reduces the construction cost on the one hand and the disassembly cost of the supporting structure on the other hand. Fourth, the rope saw cutting equipment is used. On the one hand, the top and bottom of the interface can be cut in one time, and there is no need for secondary manual jackhammer or mechanical breaking of the top and bottom. The construction is easy and efficient, and the vibration caused by the construction is small, which does not affect the overall structural strength and waterproofness. On the other hand, the cut main retaining pile wall is hoisted out in blocks, without generating a large amount of slag, which reduces the time for cleaning the slag. Fifth, after the construction is completed, the auxiliary structure top plate is connected to the main top plate, and the auxiliary structure bottom plate is connected to the main middle plate. The overall structure has high strength and good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram after step S1 of the construction method for connecting the interface structure between the main structure and the auxiliary structure of the underground station of the present invention is completed.

[0028] Figure 2 This is a structural diagram after step S2 of the construction method for connecting the interface structure between the main structure and the auxiliary structure of the underground station of the present invention is completed.

[0029] Figure 3 It is a structural schematic diagram after a rope saw cutting device is provided on the bottom plate of the accessory structure in step S3 of the construction method for joining the interface structure between the main structure and the accessory structure of the underground station according to the present invention.

[0030] Figure 4 It is a schematic diagram of the coordinated structure of the rope saw cutting equipment and the lifting equipment in step S3 of the construction method for joining the interface structure between the main structure and the auxiliary structure of the underground station according to the present invention.

[0031] Figure 5 It is a structural schematic diagram of the hoisting equipment lifting the cut main body retaining pile wall in step S3 of the construction method for connecting the interface structure between the main structure and the auxiliary structure of the underground station according to the present invention.

[0032] Figure 6 This is a structural diagram after step S4 of the construction method for connecting the interface structure between the main structure and the auxiliary structure of the underground station of the present invention is completed.

[0033] Figure 7 It is a structural schematic diagram of an interface with supporting piles inside the interface structure connection construction method of the underground station main structure and auxiliary structure of the present invention.

[0034] Figure 8 It is a structural schematic diagram of the interface of the cut-out support piles in the construction method of the interface structure connection between the main structure and the auxiliary structure of the underground station according to the present invention.

[0035] Figure 9 It is a schematic diagram of the connection structure between the auxiliary structure top plate and the main body top plate of the interface structure connection construction method of the underground station main structure and auxiliary structure of the present invention.

[0036] Figure 10 It is a schematic diagram of the connection structure between the auxiliary structure bottom plate and the main body middle plate of the interface structure connection construction method of the underground station main structure and the auxiliary structure of the present invention.

[0037] The numbers in the figure represent:

[0038] 1. Auxiliary foundation pit; 11. Auxiliary structure bottom plate; 111. Bottom plate sinking trough; 112. Bottom plate post-casting strip; 113. Connecting steel bars; 12. Auxiliary structure side plates; 13. Auxiliary structure top plate; 131. Top plate post-casting strip; 2. Main structure; 21. Main body middle plate; 22. Main body top plate; 23. Lower lap beam; 24. Connecting top beam; 3. Auxiliary retaining pile wall; 31. Auxiliary crown beam; 4. Main body retaining pile wall; 41. Support piles; 42. Main body crown beam; 5. Wall support; 51. Concrete support; 52. Steel support; 6. Wire saw cutting equipment; 7. Interface; 8. Lifting equipment. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0042] In the present invention, unless otherwise expressly specified or limited, terms such as "assemble," "connect," "connect," and "fix" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] Figures 1 to 10 An embodiment of the method for joining the interface structure between the main structure and the auxiliary structure of an underground station according to the present invention is shown. The method for joining the interface structure between the main structure and the auxiliary structure of an underground station according to this embodiment includes the following steps:

[0044] S1. Excavate an auxiliary foundation pit 1 on one side of the main structure 2 of the underground station, construct an auxiliary retaining pile wall 3 on the side of the auxiliary foundation pit 1 facing the main structure 2, and set wall supports 5 between the auxiliary retaining pile wall 3 and the upper part of the main retaining pile wall 4 on the side of the main structure 2 facing the auxiliary foundation pit 1; Figure 1 shown.

[0045] S2. Construct the auxiliary structure bottom plate 11 at the bottom of the auxiliary foundation pit 1, so that the auxiliary structure bottom plate 11 is flush with the main body middle plate 21 of the main structure 2, and the auxiliary structure bottom plate 11 is sunken toward one side of the main body retaining pile wall 4 to form a bottom plate sinking groove 111, and connected to the main body retaining pile wall 4 below the main body middle plate 21; construct the auxiliary structure side plate 12 on the other side of the auxiliary structure bottom plate 11, so that the auxiliary structure side plate 12 is close to the auxiliary retaining pile wall 3; Figure 2 shown.

[0046] S3, set the rope saw cutting device 6 on the auxiliary structure bottom plate 11, cut the interface 7 on the main body retaining pile wall 4 by the rope saw cutting device 6, so that the bottom surface of the interface 7 is located below the main body middle plate 21; and use the lifting device 8 to lift out the cut main body retaining pile wall 4; Figures 3 to 5 shown.

[0047] S4. Cast the bottom plate post-casting strip 112 into the bottom plate sinking trough 111, so that the bottom plate post-casting strip 112 is flush with the main body middle plate 21; construct the lower stop beam 23 on the lower part of the main body top plate 22 of the main structure 2 facing the interface 7, and construct the auxiliary structure top plate 13 between the top of the auxiliary structure side plate 12 and the bottom of the lower stop beam 23, as shown in FIG. Figure 6 shown.

[0048] The construction method for connecting the interface structure between the main structure and the auxiliary structure of this underground station is as follows: first, the process is to dig the auxiliary foundation pit 1, construct the auxiliary structure bottom plate 11, cut the interface 7 with the rope saw cutting equipment 6, and construct the main top plate 22. The overall process design is reasonable and the construction efficiency is high. Second, the auxiliary structure bottom plate 11 is constructed first and then cut to form the interface 7. During the cutting process, the strength of the main structure 2 is improved under the support effect of the auxiliary structure bottom plate 11, thereby improving the construction quality. Third, there is no need to erect a supporting structure, which reduces the construction cost on the one hand and reduces the support structure on the other hand. Disassembly cost; Fourth, the use of rope saw cutting equipment 6, on the one hand, the top and bottom of the interface 7 can be cut at one time, and there is no need for secondary manual jackhammers to break or mechanically break the top and bottom. The construction is easy and efficient, and the vibration caused by the construction is small, which does not affect the overall structural strength and waterproofness; on the other hand, the cut main retaining pile wall 4 is lifted out in blocks, and no large amount of slag is generated, which reduces the time for cleaning the slag; Fifth, after the construction is completed, the auxiliary structure top plate 13 is connected to the main top plate 22, and the auxiliary structure bottom plate 11 is connected to the main middle plate 21. The overall structure has high strength and good stability.

[0049] Furthermore, if Figure 9 As shown, in this embodiment, a connecting top beam 24 is pre-set on the side of the main body top plate 22 facing the interface 7. In S4, the lower lapped beam 23 is connected to the connecting top beam 24. The main body top plate 22 is integrally constructed to form the connecting top beam 24 during construction, which facilitates the subsequent connection of the lower lapped beam 23 to the connecting top beam 24.

[0050] Furthermore, in this embodiment, the lower lapped beam 23 and the stress-bearing steel bars connected to the top beam 24 are connected by welding or connectors, which not only improves the convenience of connection but also improves the connection strength.

[0051] Furthermore, if Figure 10 As shown, in this embodiment, in S4, connecting steel bars 113 are provided in the bottom plate sinking groove 111, and the connecting steel bars 113 are connected to the load-bearing steel bars of the auxiliary structure bottom plate 11 and the main body middle plate 21 through welding or connectors. Similarly, the convenience of connection is improved and the connection strength is improved.

[0052] Furthermore, in this embodiment, in S3, as Figure 7 As shown, during the cutting process of the interface 7, a support pile 41 is reserved in the middle of the interface 7 (the portion of the interface 7 that is not cut away). Figure 8 As shown, the support piles 41 are removed after the construction of the auxiliary structure top plate 13 is completed. Under the support of the support piles 41, the stability of the auxiliary structure top plate 13 during construction can be improved, thereby improving the construction quality.

[0053] Furthermore, if Figure 8As shown, in this embodiment, in S4, a top plate post-casting strip 131 is reserved at a position corresponding to the auxiliary structure top plate 13 and the supporting piles 41 to improve the overall construction quality.

[0054] Furthermore, in this embodiment, if Figure 1 and Figure 2 As shown, the wall support 5 includes a concrete support 51 and a steel support 52. In S1, the concrete support 51 is arranged between the top of the auxiliary retaining pile wall 3 and the main retaining pile wall 4, and the steel support 52 is located below the concrete support 51 and is detachably supported between the auxiliary retaining pile wall 3 and the main retaining pile wall 4.

[0055] Furthermore, in this embodiment, if Figure 3 As shown, after S2 and before S3 , the steel support 52 is removed to facilitate the installation of the wire saw cutting device 6 on the auxiliary structure bottom plate 11 .

[0056] Furthermore, in this embodiment, in S1, an auxiliary crown beam 31 is set on the top of the auxiliary retaining pile wall 3, and a main crown beam 42 is set on the top of the main retaining pile wall 4, and a concrete support 51 is set between the auxiliary crown beam 31 and the main crown beam 42 to improve the overall structural quality.

[0057] Furthermore, in this embodiment, in S3, the lifting device 8 is connected to the main retaining pile wall 4 to be cut before the rope saw cutting device 6 cuts, which can prevent the cut main retaining pile wall 4 from tipping over and causing a safety accident.

[0058] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station, characterized in that: The steps include: S1. Excavating an auxiliary foundation pit (1) on one side of the main structure (2) of the underground station, constructing an auxiliary retaining pile wall (3) on the side of the auxiliary foundation pit (1) facing the main structure (2), and providing an inter-wall support (5) between the auxiliary retaining pile wall (3) and the upper portion of the main retaining pile wall (4) on the side of the main structure (2) facing the auxiliary foundation pit (1); S2, constructing an auxiliary structure bottom plate (11) at the bottom of the auxiliary foundation pit (1), making the auxiliary structure bottom plate (11) flush with the main body middle plate (21) of the main structure (2), and making the auxiliary structure bottom plate (11) sink toward one side of the main body retaining pile wall (4) to form a bottom plate sinking groove (111), and connecting it with the main body retaining pile wall (4) below the main body middle plate (21); constructing an auxiliary structure side plate (12) on the other side of the auxiliary structure bottom plate (11), making the auxiliary structure side plate (12) close to the auxiliary retaining pile wall (3); S3. A rope saw cutting device (6) is arranged on the auxiliary structure bottom plate (11), and an interface (7) is cut on the main body retaining pile wall (4) by the rope saw cutting device (6), so that the bottom surface of the interface (7) is located below the main body middle plate (21); and a lifting device (8) is used to lift out the cut main body retaining pile wall (4); S4, pouring into the bottom plate sinking trough (111) to form a bottom plate post-casting belt (112), so that the bottom plate post-casting belt (112) is flush with the main body middle plate (21); constructing a lower lapped beam (23) at the lower part of the main body top plate (22) of the main structure (2) facing the interface (7), and constructing the auxiliary structure top plate (13) between the top of the auxiliary structure side plate (12) and the bottom of the lower lapped beam (23).

2. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 1 is characterized by: A connecting top beam (24) is preset on one side of the main body top plate (22) facing the interface (7), and in the above-mentioned S4, the lower lap beam (23) is connected to the connecting top beam (24).

3. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 2 is characterized by: The lower lap beam (23) is connected to the stress-bearing steel bars connected to the top beam (24) by welding or a connector.

4. The method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 1 is characterized by: In the above-mentioned S4, a connecting steel bar (113) is provided in the bottom plate sinking groove (111), and the connecting steel bar (113) is connected to the stress-bearing steel bars of the auxiliary structure bottom plate (11) and the main body middle plate (21) by welding or connectors.

5. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 1 is characterized by: In said S3, during the process of cutting and forming the interface (7), a support pile (41) is reserved in the middle of the interface (7), and said support pile (41) is removed after the construction of the auxiliary structure top plate (13) is completed.

6. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 5 is characterized by: In said S4, a top plate post-casting strip (131) is reserved at a position corresponding to the auxiliary structure top plate (13) and the supporting pile (41).

7. The method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to any one of claims 1 to 6, characterized in that: The inter-wall support (5) comprises a concrete support (51) and a steel support (52). In the S1, the concrete support (51) is arranged between the top of the auxiliary retaining pile wall (3) and the main retaining pile wall (4), and the steel support (52) is located below the concrete support (51) and is detachably supported between the auxiliary retaining pile wall (3) and the main retaining pile wall (4).

8. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 7 is characterized by: After S2 and before S3, the steel support (52) is removed.

9. The construction method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to claim 7, characterized in that: In the above S1, an auxiliary crown beam (31) is provided on the top of the auxiliary retaining pile wall (3), a main crown beam (42) is provided on the top of the main retaining pile wall (4), and a concrete support (51) is provided between the auxiliary crown beam (31) and the main crown beam (42).

10. The method for connecting the interface structure between the main structure and the auxiliary structure of an underground station according to any one of claims 1 to 6, characterized in that: In said S3, the hoisting device (8) is connected to the main retaining pile wall (4) to be cut before the rope saw cutting device (6) cuts.

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