A new type of bracket structure suitable for operation period subway station reconstruction

Abstract

The utility model relates to the technical field of subway station reconstruction, especially a new type of bracket structure suitable for operation period subway station reconstruction. Including: the newly built passageway is set around the edge of the opening of the side wall of the existing structure, including newly built passageway bottom plate, newly built passageway side plate and newly built passageway top plate, two newly built passageway side plates are equipped between newly built passageway bottom plate and newly built passageway top plate, and newly built passageway bottom plate, newly built passageway top plate and two newly built passageway side plates enclose annular newly built passageway space, the bracket beam is set between newly built passageway top plate and the side wall of the existing structure, including crossbeam and bracket, the bracket beam interface is set on the side wall of the existing structure correspondingly, and the bracket is inserted into the bracket beam interface. The efficiency of the reconstruction of the side wall of the subway station is improved, the stress stability and durability after the reconstruction of the side wall of the subway station are ensured, and the external water source can be effectively prevented from flowing into the operation subway station in the process of the reconstruction of the side wall.

Description

Technical Field

[0001] This utility model relates to the field of subway station renovation technology, and in particular to a novel corbel structure suitable for the renovation of subway stations during the operational phase. Background Technology

[0002] In the renovation projects of subway station side walls in China, when it is necessary to construct new structures at the side walls, the following two problems are usually encountered: First, when modifying side walls without pre-reserved interfaces, the construction method of segmented chiseling and segmented pouring is usually adopted. The problems are: the segmented chiseling and segmented pouring scheme has complex stress, many steel bar joints, many construction joints, troublesome construction, and poor overall integrity of the transfer beam, which makes it difficult to meet the requirements of structural stability and durability after the station is modified. Secondly, during the existing side wall renovation process, due to the use of segmented chiseling and segmented pouring, and considering construction costs, it is impossible to build a new closed structure at the chiseled opening in a timely manner. As a result, during the construction period, groundwater and rainwater can easily flow into the operating subway station through the chiseled opening, which has a great impact on operation and passengers.

[0003] Therefore, there is an urgent need for a structure that can solve the problems of segmented demolition, poor integrity of segmented pouring during the renovation of existing structures, and failure to close the newly built structure in a timely manner during the renovation process for the side wall renovation. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects in the existing technology and propose a new type of corbel structure suitable for the renovation of subway stations during the operation period. This structure improves the efficiency of the renovation of subway station side walls, ensures the stress stability and durability of the subway station side walls after renovation, and can effectively prevent external water sources from flowing into the operating subway station during the side wall renovation process.

[0005] The technical solution of this utility model is: a novel corbel structure suitable for the renovation of subway stations during the operational phase, comprising: The newly constructed passage is set around the edge of the opening in the side wall of the existing structure, and includes a new passage bottom plate, a new passage side plate and a new passage top plate. Two new passage side plates are set between the new passage bottom plate and the new passage top plate. The new passage bottom plate, the new passage top plate and the two new passage side plates form a ring-shaped new passage space. The corbel beam is set between the top slab of the new passage and the side wall of the existing structure. It includes a crossbeam and a corbel. Corbel beam interfaces are set on the existing side wall, and the corbel is inserted into the corbel beam interface.

[0006] In this utility model, the existing structural side wall opening is quadrilateral, and the corresponding cross-sectional shape of the newly built passage is quadrilateral; The new passageway bottom slab and the new passageway side slab are all fixedly connected to the existing structural side walls by rebar anchoring.

[0007] The crossbeams of the corbel beams are attached to the outer surface of the existing structural sidewalls; Two corbels are provided on the surface of the beam facing the existing structural side wall, and two corbel beam interfaces are provided above the interface of the existing structural side wall. The distance between the two corbel beam interfaces is 1-2m.

[0008] A prefabricated polymer waterstop is installed between the contact surface between the corbel beam and the existing structural sidewall; The precast polymer waterstop is L-shaped, with its vertical side fixed to the existing structural sidewall by adhesive bonding, and its horizontal side facing the corbel beam. The precast polymer waterstop and the corbel beam are cast together as one unit.

[0009] The beneficial effects of this utility model are: (1) The corbel structure proposed in this application adopts a ring-shaped new channel and corbel beam structure. The corbel structure is subjected to overall force and plays a supporting role on the existing structural sidewalls during the demolition process. The structure is clearly stressed and safe and reliable. (2) In this application, there are two corbels on the corbel beam, and there is a certain distance between the two corbels. There are two corbel beam interfaces on the corresponding existing side wall, and there is a certain distance between the two corbel beam interfaces. During the process of chiseling the opening on the side wall, the load on the top plate of the existing structure can be transferred to the existing side plate below through the reinforced concrete structure between the two corbel beam interfaces, which solves the problem of force conversion of the top plate of the existing structure during the chiseling. No large steel section is required for the opening chiseling process, which saves manpower and material resources during the chiseling process. (3) The corbel beam and the top slab of the new passage proposed in this application can be poured at one time without construction joints, and the integrity is better. After the pouring is completed, the new passage and the corbel beam support the existing structural side wall. At this time, the existing structural side wall can be broken and an opening can be formed. This can improve the efficiency of the renovation of the existing structural side wall and ensure the integrity, stability and durability of the side wall during the renovation process. (4) By setting up a new ring-shaped passage, the existing structural side wall opening formed by the excavation can be sealed off, preventing groundwater and other substances from entering the operating subway station through the opening, thus protecting the operating subway station. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the corbel beam interface on the side wall of the existing structure. Figure 3This is a structural schematic diagram of a corbel beam; Figure 4 This is a structural schematic diagram of the opening in the side wall of the existing structure. Figure 5 yes Figure 4 Schematic diagram of the AA-direction cross-section structure; Figure 6 This is a schematic diagram of a prefabricated polymer waterstop strip installed between the corbel beam and the existing structural sidewall. Figure 7 This is a schematic diagram of the first step in the construction process of the corbel beam structure described in this utility model; Figure 8 This is a schematic diagram of the second step in the construction process of the corbel beam structure described in this utility model; Figure 9 This is a structural diagram of the third step in the construction process of the corbel beam structure described in this utility model; Figure 10 This is a structural diagram of the fourth step in the construction process of the corbel beam structure described in this utility model; Figure 11 This is a structural diagram of the fifth step in the construction process of the corbel beam structure described in this utility model.

[0011] In the diagram: 1 Existing structural side wall; 2 New passage side slab; 3 New passage bottom slab; 4 New passage top slab; 5 Corbel beam; 501 crossbeam; 502 corbel; 6 Corbel beam joint; 7 Rebar installation; 8 Existing structural side wall opening; 9 Precast polymer waterstop; 10 Waterstop adhesive; 11 Existing structural top slab. Detailed Implementation

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0013] Specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0014] like Figures 1 to 6 As shown, the novel corbel structure of this utility model, applicable to the renovation of subway stations during the operational phase, includes a newly constructed passage located at the opening in the side wall of the existing structure, and a corbel beam 5 located between the newly constructed passage and the side wall 1 of the existing structure. The opening 8 on the side wall 1 of the existing structure is usually quadrilateral, therefore the shape of the newly constructed passage corresponds to the shape of the opening 8 in the side wall of the existing structure, that is, the cross-sectional shape of the newly constructed passage is also quadrilateral.

[0015] The newly constructed passageway includes a new passageway base plate 3, a new passageway top plate 4, and two new passageway side plates 2 located between the new passageway base plate and the new passageway top plate. The new passageway base plate 3, new passageway top plate 4, and two new passageway side plates 2 are all located on the outer ring of the existing structural side wall opening 8. The base plate, top plate, and side plates are connected end to end to form a closed, square-shaped passageway that connects to the existing structural side wall opening 8.

[0016] The newly constructed passageway bottom slab 3, the newly constructed passageway side slab 2, and the existing structural side wall 1 are all fixedly connected by rebar 7. A corbel beam 5 is provided between the newly constructed passageway top slab 4 and the existing structural side wall, and the corbel beam 5 is attached to the outer surface of the existing structural side wall 1.

[0017] The structure of the corbel beam 5 is as follows Figure 3 As shown, the structure includes a horizontal beam 501 and two brackets 502. The horizontal beam 501 is horizontally positioned and fits tightly against the outer surface of the existing structural sidewall 1. Two brackets 502 are fixed to the side of the horizontal beam 501 facing the existing structural sidewall 1. Correspondingly, two bracket beam interfaces 6 are provided on the existing structural sidewall 1, and the two brackets 502 are inserted into the bracket beam interfaces 6, thus achieving the connection between the existing structural sidewall 1 and the bracket beam 502.

[0018] In this application, since there is a certain distance between the two corbels 502, there is also a corresponding certain distance between the two corbel beam interfaces 6, which is 1-2m. The load of the existing structural top slab is transferred to the existing structural sidewall below through the 1-2m concrete structure between the two corbel beam interfaces. This avoids the need to use steel supports under the existing structural top slab during the sidewall renovation process, effectively solving the problem of difficult transportation of large steel sections in the existing subway station during operation, and cleverly solving the load transfer problem of the existing structural top slab.

[0019] To prevent water leakage between the corbel beam 5 and the existing structural side wall 1, and to ensure the safe operation of the subway after the side wall renovation, a prefabricated polymer waterstop 9 is installed between the contact surfaces of the corbel beam 5 and the existing structural side wall 1. The prefabricated polymer waterstop 9 has an L-shaped cross-section. Its vertical side is fixedly connected to the existing structural side wall 1 by adhesive bonding, while its horizontal side faces the corbel beam 5. During the corbel beam casting process, the prefabricated polymer waterstop 9 and the corbel beam are cast as a single integrated structure. The prefabricated polymer waterstop 9 effectively blocks water seepage between the contact surfaces of the corbel beam 5 and the existing structural side wall 1, preventing water leakage through the vertical through-joint between them.

[0020] In addition, a water-swellable sealant 10 is provided on the contact surface between the existing structural side wall 1 and the corbel beam 5.

[0021] The construction process of a novel corbel structure applicable to the renovation of subway stations during the operational phase, as proposed in this application, is described below.

[0022] The first step is to install rebar 7 at the bottom and both sides of the opening in the existing structural side wall, as shown below. Figure 7 As shown. Since the bending moment of the side wall is very small when the existing structure has an opening, only rebar connection is required.

[0023] The second step involves pouring the new channel base slab 3 and the new channel side slabs 2 from bottom to top. Both the new channel base slab 3 and the new channel side slabs 2 are fixedly connected to the existing structural side walls 1 by reinforcing bars 7. Figure 8 As shown.

[0024] The third step involves creating two corbel beam interfaces 6 at the top of the existing subway station interface area, with the spacing between the two corbel beam interfaces 6 controlled between 1-2 meters to reserve space for subsequent corbel beam construction. Figure 9 As shown.

[0025] The fourth step involves simultaneously pouring the newly constructed passageway top slab 4 and corbel beam 5, ensuring that the corbel beam is poured in one go without construction joints, resulting in better overall integrity and safety. Figure 10 As shown.

[0026] Step 5: With the construction of the new passageway and corbel beams now complete, remove all sidewalls within the area of ​​the existing structural sidewall opening 8. Figure 11 As shown. The renovation plan for the existing structural sidewalls is now complete.

[0027] By setting up new passages and corbel beams, the existing structural sidewalls can be supported during the process of chiseling open the sidewalls, ensuring the safety and integrity of the existing structure during the sidewall renovation. Large steel sections are not required for structural support. At the same time, the new passages can also seal the interface of the structural sidewalls, preventing external groundwater from entering the subway station through the interface, thus ensuring the safety of the operating station during the sidewall renovation.

[0028] The above provides a detailed description of a novel corbel structure suitable for the renovation of subway stations during the operational phase, as provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. The above description of the disclosed embodiments enables those skilled in the art to implement or use this utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel corbel structure suitable for the renovation of subway stations during the operational phase, characterized in that, include: The newly constructed passage is set around the edge of the opening in the side wall of the existing structure, and includes a new passage bottom plate, a new passage side plate and a new passage top plate. Two new passage side plates are set between the new passage bottom plate and the new passage top plate. The new passage bottom plate, the new passage top plate and the two new passage side plates form a ring-shaped new passage space. The corbel beam is set between the top slab of the new passage and the side wall of the existing structure. It includes a crossbeam and a corbel. Corbel beam interfaces are set on the existing side wall, and the corbel is inserted into the corbel beam interface.

2. The novel corbel structure suitable for the renovation of subway stations during the operational phase, as described in claim 1, is characterized in that... The existing structure has quadrilateral openings in its side walls, and the corresponding new passageway has a quadrilateral cross-sectional shape. The new passageway bottom slab and the new passageway side slab are all fixedly connected to the existing structural side walls by rebar anchoring.

3. A novel corbel structure suitable for the renovation of subway stations during the operational phase, as described in claim 1, is characterized in that... The crossbeams of the corbel beams are attached to the outer surface of the existing structural sidewalls; Two corbels are provided on the surface of the beam facing the existing structural side wall, and two corbel beam interfaces are provided above the interface of the existing structural side wall. The distance between the two corbel beam interfaces is 1-2m.

4. A novel corbel structure suitable for the renovation of subway stations during the operational phase, as described in claim 1, is characterized in that... A prefabricated polymer waterstop is installed between the contact surface between the corbel beam and the existing structural sidewall; The precast polymer waterstop is L-shaped, with its vertical side fixed to the existing structural sidewall by adhesive bonding, and its horizontal side facing the corbel beam. The precast polymer waterstop and the corbel beam are cast together as one unit.

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