Built-in steel box structure of underground excavation construction top plate for underneath pass of existing station
By using an internal steel box structure in the underground excavation construction under the existing station, and by connecting it with reinforcing piles and steel mesh, the problem of jacks affecting the stress of the lining was solved, the continuity and integrity of the steel reinforcement were achieved, and cracks were avoided.
Patent Information
- Application Number
- CN202520113273.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2035-01-16
AI Technical Summary
During the underground excavation construction of tunnels under existing stations, the jacks poured into the lining can obstruct the connection of the reinforcing bars, affecting the overall stress state of the lining and making it prone to cracks.
The underground tunnel construction adopts a method of embedding a steel box structure in the roof slab. The steel box structure is supported by reinforcement piles, and longitudinal and transverse steel bars form a grid on the steel box structure. After being tied and connected, the lining is poured, avoiding the use of jacks.
This ensures the continuity and integrity of the reinforcing steel, avoids affecting the overall stress state of the lining, and prevents cracks from forming.
Smart Images
Figure CN223536358U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tunnel construction technology, specifically to a steel box structure built into the roof slab for tunneling under an existing station. Background Technology
[0002] In the underground excavation construction of tunnels under existing stations, in order to ensure the structural safety of the existing stations, it is necessary to support the stations with support piles during the construction process. After the support piles are completed, jacks and other structures are often used for transitional connection to adjust and maintain the support force. However, after the underground excavation is completed, when constructing the top lining, the jacks need to be poured into the lining, which will block the binding connection of the steel bars in the lining, and affect the overall stress state of the lining again, which can easily cause cracks. Utility Model Content
[0003] The purpose of this utility model is to provide a steel box structure built into the roof slab for underground excavation construction of existing stations, in order to solve the problem mentioned in the background art that when constructing the top lining, it is necessary to pour jacks into the lining, which will block the binding connection of the steel bars in the lining, affect the overall stress state of the lining, and easily cause cracks.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a steel box structure built into the roof slab for underground excavation of an existing station: It includes an existing tunnel, with a new tunnel excavated at the bottom of the existing tunnel. Reinforcing piles are fixedly connected to the surface of the new tunnel. A steel box structure body is installed on the surface of the reinforcing piles. The steel box structure body includes a support plate, which is welded to the top of the reinforcing piles. Two sets of support plates are provided, and a connecting plate is fixedly connected between the two sets of support plates. The top support plate is in contact with the bottom of the existing tunnel. Reinforcing bar holes are formed on the surface of the connecting plate, and longitudinal reinforcing bars are perforated and connected to the reinforcing bar holes. Multiple sets of connecting plates are provided, and transverse reinforcing bars are placed between the multiple sets of connecting plates. A lining is poured inside the new tunnel, and the top of the lining covers the top of the steel box structure body and the top of the reinforcing piles.
[0005] Preferably, multiple sets of reinforcing piles are provided, with the bottom of the reinforcing piles located at the bottom of the new tunnel, and the reinforcing piles supporting the steel box structure body on the new tunnel.
[0006] Preferably, the support plate and the rebar holes are perpendicular to each other, and multiple sets of rebar holes are provided, with the multiple sets of rebar holes arranged linearly and uniformly between the two sets of support plates.
[0007] Preferably, there are three sets of rebar holes and three sets of longitudinal rebars, with the three sets of longitudinal rebars corresponding to the three sets of rebar holes.
[0008] Preferably, the longitudinal reinforcing bars pass through multiple sets of connecting plates simultaneously through the reinforcing bar holes, and the connecting plates support the longitudinal reinforcing bars on the steel box structure body.
[0009] Preferably, the support plate, connecting plate, and longitudinal reinforcing bars form multiple sets of grid holes on the steel box structure body, and the transverse reinforcing bars pass through the grid holes of the steel box structure body.
[0010] Preferably, the longitudinal and transverse reinforcing bars are perpendicular to each other, and there are multiple sets of transverse reinforcing bars, with the multiple sets of transverse and longitudinal reinforcing bars not on the same horizontal plane.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. Reinforcing piles are driven into the bottom of the existing tunnel, and then the new tunnel is excavated. The steel box structure is welded to the top of the reinforcing piles, and longitudinal reinforcing bars are passed through the reinforcing bar holes on the connecting plate. At this time, the supporting plate, connecting plate, and longitudinal reinforcing bars form multiple sets of grid holes on the steel box structure, allowing transverse reinforcing bars to pass through the grid holes of the steel box structure. The multiple sets of transverse reinforcing bars are tied together, and then the lining inside the new tunnel is poured, so that the top of the lining covers the top of the steel box structure and the top of the reinforcing piles. After the lining is fixed, the reinforcing piles are cut and removed inside the new tunnel. This steel box structure avoids the use of jacks, thus avoiding obstruction of the binding connection of reinforcing bars, ensuring the continuity and integrity of the reinforcing bars in the concrete, not affecting the overall stress state of the lining, and is not prone to cracking. Attached Figure Description
[0013] Figure 1 This is a front sectional view of the structure of this utility model;
[0014] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A;
[0015] Figure 3 This is a frontal sectional perspective view of the main body structure of the steel box structure of this utility model;
[0016] Figure 4 A three-dimensional sectional view of the steel box structure body of this utility model, showing the assembly of reinforcing bars.
[0017] Figure 5 This utility model Figure 4 A magnified structural diagram at point B in the middle.
[0018] In the diagram: 1. Existing tunnel; 11. New tunnel; 12. Reinforcing pile; 2. Steel box structure body; 21. Support plate; 22. Connecting cladding plate; 23. Rebar hole; 24. Longitudinal reinforcement; 25. Transverse reinforcement; 3. Lining. Detailed Implementation
[0019] Please see Figure 1-5 One embodiment provided by this utility model:
[0020] A steel box structure with an embedded top slab for tunneling under an existing station includes an existing tunnel 1, a new tunnel 11 excavated at the bottom of the existing tunnel 1, reinforcing piles 12 fixedly connected to the surface of the new tunnel 11, and a steel box structure body 2 set on the surface of the reinforcing piles 12. The steel box structure body 2 includes a support plate 21, which is welded to the top of the reinforcing piles 12. There are two sets of support plates 21, and a connecting plate 22 is fixedly connected between the two sets of support plates 21. The top support plate 21 is in contact with the bottom of the existing tunnel 1. There are steel bar holes 23 on the surface of the connecting plate 22, and longitudinal steel bars 24 are perforated and connected to the steel bar holes 23. There are multiple sets of connecting plates 22, and transverse steel bars 25 are placed between the multiple sets of connecting plates 22. A lining 3 is poured inside the new tunnel 11, and the top of the lining 3 covers the top of the steel box structure body 2 and the top of the reinforcing piles 12.
[0021] Furthermore, multiple sets of reinforcing piles 12 are provided. The bottom of the reinforcing piles 12 is located at the bottom of the new tunnel 11. The reinforcing piles 12 support the steel box structure body 2 on the new tunnel 11. The reinforcing piles 12 are installed from the bottom of the existing tunnel 1 before the excavation of the reinforcing piles 12. The reinforcing piles 12 have a certain height so that they can be located at one end of the bottom of the new tunnel 11. The top of the reinforcing piles 12 can support the steel box structure body 2 at the top of the new tunnel 11.
[0022] Furthermore, the support plate 21 and the rebar holes 23 are perpendicular to each other. There are multiple sets of rebar holes 23, and the multiple sets of rebar holes 23 are arranged linearly and evenly between the two sets of support plates 21. The support plate 21 and the connecting plate 22 ensure the stability of the entire steel box structure body 2.
[0023] Furthermore, there are three sets of reinforcing bar holes 23 and three sets of longitudinal reinforcing bars 24. The three sets of longitudinal reinforcing bars 24 correspond to the three sets of reinforcing bar holes 23, and the three sets of longitudinal reinforcing bars 24 are respectively connected to the three sets of reinforcing bar holes 23.
[0024] Furthermore, the longitudinal reinforcing bars 24 pass through multiple sets of connecting plates 22 simultaneously through the reinforcing bar holes 23. The connecting plates 22 support the longitudinal reinforcing bars 24 on the steel box structure body 2, thereby facilitating the assembly of the longitudinal reinforcing bars 24.
[0025] Furthermore, the support plate 21, the connecting plate 22, and the longitudinal steel bars 24 form multiple sets of grid holes on the steel box structure body 2, and the transverse steel bars 25 pass through the grid holes of the steel box structure body 2. At this time, the transverse steel bars 25 and the longitudinal steel bars 24 can be tied together to ensure the position of the transverse steel bars 25 and the longitudinal steel bars 24.
[0026] Furthermore, the longitudinal reinforcement 24 and the transverse reinforcement 25 are perpendicular to each other. There are multiple sets of transverse reinforcement 25, and the multiple sets of transverse reinforcement 25 and longitudinal reinforcement 24 are not on the same horizontal plane. After the transverse reinforcement 25 and longitudinal reinforcement 24 on the steel box structure body 2 are assembled, the lining 3 will be poured, and the lining 3 will be poured from the bottom to the top inside the new tunnel 11.
[0027] Working principle: The reinforcing pile 12 is driven into the bottom of the existing tunnel 1, and then the new tunnel 11 is excavated. The steel box structure body 2 is welded to the top of the reinforcing pile 12. The longitudinal steel bars 24 are then passed through the steel bar holes 23 on the connecting plate 22. At this time, the supporting plate 21, the connecting plate 22, and the longitudinal steel bars 24 form multiple sets of grid holes on the steel box structure body 2, so that the transverse steel bars 25 pass through the grid holes of the steel box structure body 2. The multiple sets of transverse steel bars 25 and longitudinal steel bars 24 are tied together. Then, the lining 3 is poured inside the new tunnel 11, so that the top of the lining 3 covers the top of the steel box structure body 2 and the top of the reinforcing pile 12. After the lining 3 is fixed, the reinforcing pile 12 is cut and removed inside the new tunnel 11. This steel box structure avoids the use of jacks, thereby avoiding the obstruction of the binding connection of the steel bars, ensuring the continuity and integrity of the steel bars in the concrete, not affecting the overall stress state of the lining 3, and is not prone to cracking.
Claims
1. A steel box girder structure built into the roof slab for underground excavation of an existing station, comprising an existing tunnel, wherein a new tunnel is excavated at the bottom of the existing tunnel, characterized in that: The new tunnel has reinforcing piles fixedly connected to its surface. A steel box structure body is installed on the surface of the reinforcing piles. The steel box structure body includes a support plate, which is welded to the top of the reinforcing pile. There are two sets of support plates, and a connecting plate is fixedly connected between the two sets of support plates. The top support plate is in contact with the bottom of the existing tunnel. The surface of the connecting plate has rebar holes, and longitudinal rebars are inserted through the rebar holes. There are multiple sets of connecting plates, and transverse rebars are placed between the multiple sets of connecting plates. The new tunnel is filled with lining, and the top of the lining covers the top of the steel box structure body and the top of the reinforcing pile.
2. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 1, characterized in that: Multiple sets of reinforcement piles are provided, with the bottom of each pile located at the bottom of the new tunnel. These piles support the steel box structure within the new tunnel.
3. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 1, characterized in that: The support plate and the rebar holes are perpendicular to each other. There are multiple sets of rebar holes, and the multiple sets of rebar holes are arranged linearly and evenly between the two sets of support plates.
4. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 1, characterized in that: There are three sets of rebar holes and three sets of longitudinal rebars, with the three sets of longitudinal rebars corresponding to the three sets of rebar holes.
5. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 4, characterized in that: The longitudinal reinforcing bars pass through multiple sets of connecting plates simultaneously through the reinforcing bar holes, and the connecting plates support the longitudinal reinforcing bars on the steel box structure body.
6. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 1, characterized in that: The supporting plate, connecting plate, and longitudinal reinforcing bars form multiple sets of grid holes on the steel box structure body, and the transverse reinforcing bars pass through the grid holes of the steel box structure body.
7. The steel box structure built into the roof slab for tunneling under an existing station as described in claim 6, characterized in that: The longitudinal and transverse reinforcing bars are perpendicular to each other, and there are multiple sets of transverse reinforcing bars, which are not on the same horizontal plane as the longitudinal reinforcing bars.