Lining-free underground diaphragm wall and floor node structure of reverse fabricated subway station

Abstract

The utility model relates to a top-down assembly type metro station lining-free underground diaphragm wall and floor node structure which comprises an underground diaphragm wall, embedded sealing channel steel is arranged on the side face of the underground diaphragm wall, a notch of the sealing channel steel is correspondingly formed in the outer side of the underground diaphragm wall, a floor is connected to the upper portion in the notch, and the lower portion of the sealing channel steel is connected with the lower portion of the underground diaphragm wall. The sealing channel steel is provided with a notch, a plurality of prefabricated brackets used for supporting the floor slab are arranged at the position, below the floor slab, in the notch, and the side wall of the sealing channel steel is welded to a steel reinforcement framework of the underground diaphragm wall. The prefabricated brackets are arranged on the sealing channel steel to support the floor slab, and stress of the floor slab is transmitted to the underground diaphragm wall; a lining wall does not need to be arranged in the underground diaphragm wall, the good supporting effect is achieved, the construction difficulty is lowered, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled underground structure construction, and particularly relates to a joint structure of a diaphragm wall without inner lining and a floor slab of a reverse-construction assembled subway station. Background Technique

[0002] The assembled technology has been fully verified with its advantages of high efficiency, environmental protection, convenience, etc., and has been widely used in superstructures. In recent years, it has been gradually applied to the subway underground station structure. However, most of the current assembled subway underground station structures are based on the traditional cut-and-cover method for the disassembly of assembled components and joint design, and their construction plans mostly adopt the cut-and-cover method. There is a lack of design for the assembled subway underground station structure based on the top-down method.

[0003] Since the cut-and-cover method starts the construction from the bottom slab of the station structure, the whole construction process requires the foundation pit to be in an excavated state for a long time, which will affect the surrounding traffic and urban environment for a long time. At the same time, various factors inducing the collapse of the foundation pit are more difficult to predict, thus threatening the safety of the construction site and surrounding buildings. Based on this, the top-down method came into being. Through the top-down construction process, the soil can be backfilled after the top slab is constructed, the construction environment can be closed, and the noise impact can be minimized; the road traffic can be restored, and the impact on road traffic can be minimized; at the same time, the construction plan of excavating and constructing at the same time can also minimize the impact on the surrounding soil field.

[0004] In the prior art, an inner lining wall needs to be set in the diaphragm wall of the subway station, but the assembly efficiency of the inner lining wall is low and the construction period is long, which is not suitable for the assembly construction of the assembled station.

[0005] To sum up, it is necessary to propose a key joint design scheme and construction method for the subway underground station structure that conforms to the top-down construction process, so as to provide reference for the selection of actual engineering joints. Summary of the Invention

[0006] Aiming at the deficiencies in the prior art, the utility model provides a diaphragm wall and floor slab joint structure with low construction difficulty and a support effect meeting the standards. The specific scheme is as follows:

[0007] A joint structure of a diaphragm wall without inner lining and a floor slab of a reverse-construction assembled subway station includes a diaphragm wall. An embedded sealing channel steel is arranged on the side surface of the diaphragm wall. The notch of the sealing channel steel is correspondingly opened on the outer side of the diaphragm wall. A floor slab is connected to the upper part in the notch. A plurality of precast corbels for supporting the floor slab are arranged below the floor slab in the notch. The side wall of the sealing channel steel is welded to the steel bar framework of the diaphragm wall.

[0008] Furthermore, the sealed channel steel is a section steel member, and the sealed channel steel is connected to the steel reinforcement cage of the diaphragm wall through lapping steel bars. The lapping steel bars include multiple main bars, and the multiple main bars are arranged in sequence along the length direction of the sealed channel steel. The main bars are asymmetric U-shaped steel bars, including two upper bars and two lower bars that are parallel to each other up and down. One end of the upper bar and the lower bar respectively passes through the side wall of the sealed channel steel and enters the groove, and the other end of the upper bar and the lower bar is a closed end, and the closed end is welded and fixed to the joint on the diaphragm wall.

[0009] Furthermore, the length of the upper bar is greater than the length of the lower bar.

[0010] Furthermore, holes for receiving the main bars are provided in the side wall of the sealed channel steel. A bayonet is provided at the access end of the hole, a flanging is provided at the outer end of the bayonet, and a sealing ring is arranged between the flanging and the side wall.

[0011] Furthermore, a plurality of haunch plates are arranged at intervals in the sealed channel steel. The plurality of haunch plates and the sealed channel steel together form a plurality of cavities, and the plurality of precast corbels are respectively arranged and installed in the plurality of cavities, and the width of the precast corbel matches the width of the cavity.

[0012] Furthermore, haunch plates for sealing are respectively provided at both ends of the sealed channel steel.

[0013] Furthermore, the precast corbel is a section steel member and is fixedly connected to the cavity of the precast corbel.

[0014] Furthermore, the lapping steel bars are flush with the floor slab. The floor slab is a concrete member, and a steel bar joint is reserved at one end of the floor slab facing the sealed channel steel. The steel bar joint is welded and fixed to the lapping steel bars inserted into the sealed channel steel.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] 1. The present utility model supports the floor slab by arranging precast corbels in the sealed channel steel, transfers the stress of the floor slab to the diaphragm wall, and there is no need to set an inner lining wall in the diaphragm wall, and it has a good supporting effect, reducing the construction difficulty and improving the construction efficiency;

[0017] 2. The present utility model is connected between the sealed channel steel and the steel reinforcement cage of the diaphragm wall through lapping steel bars, and then connected to the steel bar joints of the floor slab through the lapping steel bars, so that the diaphragm wall, the sealed channel steel and the floor slab are connected to form a whole, which has the advantages of simple construction and firm connection;

[0018] 3. The present utility model is provided with cavities formed by a plurality of haunch plates at intervals in the sealed channel steel, and the plurality of precast corbels are respectively arranged in the plurality of cavities, further increasing the overall stability and improving the work efficiency. Description of the Drawings

[0019] The following will, with reference to the accompanying drawings, describe in detail the specific embodiments of the present utility model, making the technical solutions and their beneficial effects of the present utility model obvious.

[0020] Figure 1 It is a schematic diagram of the diaphragm wall - floor slab joint provided by the present utility model;

[0021] Figure 2 It is a schematic diagram of the sealed channel steel and lapped steel bars provided by the present utility model;

[0022] Figure 3 It is a schematic diagram of the precast corbel provided by the present utility model;

[0023] Figure 4 It is a schematic diagram of the precast floor slab provided by the present utility model;

[0024] Reference numerals:

[0025] 1, sealed channel steel; 2, lapped steel bars; 21, main reinforcement; 22, sealing ring; 23, bayonet; 3, precast corbel; 4, diaphragm wall; 5, floor slab. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of them.

[0027] Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the utility model.

[0028] In the description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to has a specific orientation, is constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances. Example 1

[0030] As Figure 1 shown, a joint structure of a diaphragm wall 4 without inner lining and a floor slab 5 in a top-down assembled subway station includes a diaphragm wall 4. An embedded sealing channel steel 1 is arranged on the side surface of the diaphragm wall 4. The notch of the sealing channel steel 1 is correspondingly opened on the outer side of the diaphragm wall 4. The floor slab 5 is connected to the upper part in the notch. A plurality of precast corbels 3 for supporting the floor slab 5 are arranged below the floor slab 5 in the notch. The side wall of the sealing channel steel 1 is welded to the steel bar framework of the diaphragm wall 4.

[0031] As Figure 2 shown, the sealing channel steel 1 is a section steel member. The thickness of the side wall of the sealing channel steel 1 is not less than 20 mm, and the tensile strength is not less than 500 MPa. The sealing channel steel 1 and the steel bar framework of the diaphragm wall 4 are connected by lap bars 2. The lap bars 2 include a plurality of main bars 21. The plurality of main bars 21 are arranged in sequence along the length direction of the sealing channel steel 1. The main bars 21 are asymmetric U-shaped steel bars, and their tensile strength is not less than 500 MPa. They include two upper bars and lower bars that are parallel up and down. One end of the upper bar and the lower bar respectively passes through the side wall of the sealing channel steel 1 and enters the groove. The other end of the upper bar and the lower bar is a closed end, and the closed end is welded and fixed to the joint on the diaphragm wall 4.

[0032] The length of the upper bar is greater than the length of the lower bar.

[0033] Holes for receiving the main bars 21 are opened in the side wall of the sealing channel steel 1. A bayonet 23 is arranged at the access end of the hole. A flanging is arranged at the outer end of the bayonet 23. A sealing ring 22 is arranged between the flanging and the side wall.

[0034] As Figure 4 shown, the lap bars 2 are flush with the floor slab 5. The floor slab 5 is a concrete member. A steel bar joint is reserved at one end of the floor slab 5 facing the sealing channel steel 1. The steel bar joint is welded and fixed to the lap bars 2 inserted into the sealing channel steel 1. Example 2

[0035] As Figure 3 shown, the precast corbel 3 is a section steel member. The precast corbel 3 is fixedly connected to the cavity by bolts, and the gap between the precast corbel 3 and the cavity is sealed by welding seams. A plurality of haunch plates are arranged at intervals in the sealing channel steel 1. The height of the haunch plates is the same as the height of the corbels. The plurality of haunch plates and the sealing channel steel 1 together form a plurality of cavities. The plurality of precast corbels 3 are respectively arranged and installed in the plurality of cavities. The width of the precast corbel 3 matches the width of the cavity. Haunch plates for sealing are arranged at both ends of the sealing channel steel 1. Example 3

[0036] The construction flow chart of the ground-connected wall 4-floor slab 5 node, the specific steps are as follows:

[0037] S1, Sealing channel steel 1 processing: the hole in the side wall is formed in one step;

[0038] S2, prefabricated overlapping steel bars 2, the overlapping steel bars 2 are inserted into the sealing channel steel 1 from the outside of the hole;

[0039] S3, after compacting the sealing ring 22, welding the hole edge to the overlapping steel bar 2;

[0040] S4, bending down the main reinforcement 21 to form an asymmetric U-shaped reinforcement;

[0041] S5. Weld steel plates to seal the two ends and the notch of the sealing channel steel 1, and check the sealing performance;

[0042] S6. Casting of ground-connected wall 4: Tie up the steel bars of ground-connected wall 4, and weld the sealing channel steel 1 in position to form a groove for ground-connected wall 4;

[0043] S7, lowering ground diaphragm wall 4; pouring ground diaphragm wall 4;

[0044] S8. Excavate to the elevation of the sealing channel steel 1, remove the sealing steel plate of the sealing channel steel 1, hoist the prefabricated corbel 3 into place and install it, and perform full seam welding;

[0045] S9, installation of floor slab 5: hoist the prefabricated floor slab 5 into place; weld the reinforcement joints of floor slab 5 and the overlapping reinforcement 2 in position;

[0046] S10, pouring of node area.

[0047] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An inverted construction prefabricated subway station node structure of a diaphragm wall without an inner lining and a floor slab, comprising a diaphragm wall (4), wherein a sealed channel steel (1) is embedded on the side surface of the diaphragm wall (4), and the notch of the sealed channel steel (1) is correspondingly opened on the outer side of the diaphragm wall (4), characterized in that, The upper part located in the slot is connected with a floor slab (5). A plurality of precast corbels (3) for supporting the floor slab (5) are arranged below the floor slab (5) in the slot. The side wall of the sealed channel steel (1) is welded to the steel reinforcement cage of the diaphragm wall (4).

2. The joint structure of the diaphragm wall without inner lining and floor slab of the inverse construction prefabricated subway station according to claim 1, characterized in that, The sealed channel steel (1) is a profiled steel member. The sealed channel steel (1) is connected to the steel reinforcement cage of the diaphragm wall (4) through lapping steel bars (2). The lapping steel bars (2) include a plurality of main bars (21). The plurality of main bars (21) are arranged in sequence along the length direction of the sealed channel steel (1). The main bars (21) are asymmetric U-shaped steel bars, including two upper bars and two lower bars that are parallel to each other up and down. One end of the upper bar and the lower bar respectively passes through the side wall of the sealed channel steel (1) and enters the groove. The other end of the upper bar and the lower bar is a closed end, and the closed end is welded and fixed to the joint on the diaphragm wall (4).

3. The joint structure of the diaphragm wall without inner lining and floor slab of the inverse construction prefabricated subway station according to claim 2, characterized in that, The length of the upper bar is greater than the length of the lower bar.

4. The reverse construction prefabricated subway station diaphragm wall without inner lining and floor slab joint structure according to claim 2, characterized in that, A hole for receiving the main bar (21) is formed in the side wall of the sealed channel steel (1). A bayonet (23) is arranged at the access end of the hole. A flanging is arranged at the outer end of the bayonet (23), and a sealing ring (22) is arranged between the flanging and the side wall.

5. The node structure of the diaphragm wall without inner lining and floor slab in the top-down assembled subway station according to claim 1, characterized in that A plurality of haunch plates are arranged at intervals in the sealed channel steel (1). The plurality of haunch plates and the sealed channel steel (1) together form a plurality of cavities. The plurality of precast corbels (3) are respectively arranged and installed in the plurality of cavities, and the width of the precast corbel (3) matches the width of the cavity.

6. The joint structure of the diaphragm wall without inner lining and the floor slab of the inverted construction prefabricated subway station according to claim 5, characterized in that, Haunch plates for sealing are respectively arranged at both ends of the sealed channel steel (1).

7. The joint structure of the diaphragm wall without inner lining and floor slab of the inverted construction prefabricated subway station according to claim 4, characterized in that The precast corbel (3) is a profiled steel member, and the precast corbel (3) is fixedly connected to the cavity.

8. The joint structure of the diaphragm wall without inner lining and floor slab of the inverse construction prefabricated subway station according to claim 4, characterized in that The lapping steel bar (2) is flush with the floor slab (5). The floor slab (5) is a concrete member. A steel bar joint is reserved at one end of the floor slab (5) facing the sealed channel steel (1), and the steel bar joint is welded and fixed to the lapping steel bar (2) inserted into the sealed channel steel (1).

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