Steel bar structure for comprehensive grounding of tunnel
By welding three steel bar sections to an arched steel bar during tunnel construction to form a circumferential grounding steel bar, and then introducing it into the cable trench through the secondary lining sidewall steel bar, the problems of high damage rate of the secondary lining waterproof membrane and poor welding quality of the grounding steel bar were solved, achieving efficient grounding system function and reducing maintenance costs.
Patent Information
- Application Number
- CN202423198021.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-24
AI Technical Summary
During tunnel construction, the secondary lining waterproofing membrane suffered extensive damage due to poor welding of the reinforcing bars, which prevented the grounding reinforcing bars from effectively closing the circuit and increased maintenance costs.
Three steel bar sections are fixed by extrusion sleeves, and adjacent steel bar sections are welded together by arc-shaped steel bars to form a circumferential grounding steel bar. The grounding is achieved by introducing the steel bars of the secondary lining side wall into the cable trench. The arc-shaped steel bar is welded to the steel bar section for a length of at least 10cm to ensure welding quality.
It improved the quality of the secondary lining steel reinforcement connection, reduced the damage rate of the waterproof membrane, ensured the functionality of the grounding system, and reduced the later maintenance costs.
Smart Images
Figure CN223562832U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of tunnel construction technology, provide a kind of tunnel comprehensive grounding with reinforcing bar structure for reducing the breakage rate of secondary lining waterproof board, improving grounding reinforcing bar welding quality and reducing later maintenance cost. BACKGROUND
[0002] With the development of high-speed railway, the traction load of railway increases, and the return current of traction substation also increases. The grounding system of traction substation faces two serious problems: the first problem is that the return current causes the ground grid potential to be unequal, which threatens the safety of personnel and equipment on the one hand, and affects the protection, measurement and signal devices on the other hand, and may cause the protection device to malfunction or refuse to operate. The second problem is that the bus current fluctuation increases due to the start and brake operations of the locomotive during operation, and the electromagnetic signals generated by this fluctuation will interfere with the signal and communication circuits in the substation, and will also interfere with the measurement signals of the protection device and affect the communication between the dispatch center and the substation, so the development of comprehensive grounding system has become an inevitable trend.
[0003] The grounding device in structures such as bridges, tunnels, ballastless tracks and catenary support foundations should preferentially use non-prestressed structural steel bars in the structure as natural grounding bodies; when there is no structural steel bar available, dedicated grounding steel bars can be added; when the grounding resistance of the natural grounding body does not meet the requirements, artificial grounding bodies should be added; to prevent affecting the prestressed steel bars, the prestressed steel bars should not be connected to the comprehensive grounding system. In the comprehensive grounding system, the grounding resistance of the building, structure and equipment at the through ground wire connection point should not be greater than 1Ω.
[0004] In the secondary lining project of the tunnel, the longitudinal and circumferential structural steel bars of the inner and outer layers of the secondary lining are used as grounding steel bars, and the length of the steel bars of the secondary lining of the whole ring of the high-speed railway double-track tunnel is 26m-28m. Since the original steel bars are generally 9m in length, the steel bar connection ends have to be welded, and since the welding process cannot effectively ensure the quality of the steel bar connection, large-area welding can easily cause the secondary lining waterproof board to be damaged, and as the use time passes, the steel bars of the whole ring of the secondary lining cannot effectively form a closed loop, and ultimately the comprehensive grounding system needs to be maintained, increasing the subsequent maintenance cost. UTILITY MODEL CONTENTS
[0005] Therefore, the purpose of the utility model is to provide a kind of tunnel comprehensive grounding with reinforcing bar structure for reducing the breakage rate of secondary lining waterproof board, improving grounding reinforcing bar welding quality and reducing later maintenance cost.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:
[0007] The utility model provides a tunnel comprehensive ground uses reinforcing bar structure, wherein: including secondary lining outer layer reinforcing bar, this secondary lining outer layer reinforcing bar includes three reinforcing bar sections, two adjacent reinforcing bar sections are fixed as an organic whole through extrusion sleeve, and two adjacent reinforcing bar sections are welded as an organic whole through arc reinforcing bar, the welding spot between arc reinforcing bar and reinforcing bar section is around extrusion sleeve,
[0008] The three reinforcing bar sections and the two arc reinforcing bars integrally form a ring-shaped grounding reinforcing bar.
[0009] To effectively ensure the functionality of the grounding system, in the above scheme, further: the ring-shaped grounding reinforcing bar is introduced into the cable groove through the secondary lining side wall reinforcing bar to realize comprehensive grounding of the secondary lining outer layer reinforcing bar.
[0010] To effectively ensure the welding quality, in the above scheme, further: the welding length between the arc reinforcing bar and the reinforcing bar section is at least 10 cm.
[0011] The utility model has the advantages of:
[0012] (1) simple and convenient to make, simple and efficient to apply, and strong in popularization.
[0013] (2) high in quickness in use, effectively solves the problem that the secondary lining ring-shaped grounding reinforcing bar of the electrified railway cannot be effectively closed into a ring, simultaneously ensures the connection quality of the secondary lining reinforcing bar main reinforcement, improves the upper limit of the stress load of the secondary lining reinforcing bar structure system, locally welds, reduces the damage rate of the secondary lining waterproof plate, and reduces the later maintenance cost. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described in preferred detail below in combination with the drawings, wherein:
[0015] Fig. 1 It is the structural schematic diagram of the utility model;
[0016] Fig. 2 It is the local enlarged structural schematic diagram of the utility model;
[0017] The drawing sign: 1, secondary lining outer layer reinforcing bar; 2, reinforcing bar section; 3, extrusion sleeve; 4, arc reinforcing bar. DETAILED DESCRIPTION
[0018] The utility model will be described further below in combination with specific implementation. Wherein, the drawing is only for example description, and the representation is only schematic diagram, and cannot be understood as the limitation of the patent of the utility model; in order to better illustrate the embodiment of the utility model, some components of the drawing can be omitted, enlarged or reduced, and do not represent the size of actual product; for the person skilled in the art, it is understandable that some known structures in the drawing and their description can be omitted.
[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] The present invention will be further described in detail below with reference to the accompanying drawings.
[0021] like Figs. 1-2 As shown, this utility model provides a steel reinforcement structure for integrated grounding in tunnels, which includes a secondary lining outer layer steel reinforcement 1, the secondary lining outer layer steel reinforcement 1 including three steel reinforcement sections 2, two adjacent steel reinforcement sections 2 are fixed together by an extrusion sleeve 3, and two adjacent steel reinforcement sections 2 are welded together by an arc-shaped steel reinforcement 4; the weld point between the arc-shaped steel reinforcement 4 and the steel reinforcement section 2 bypasses the extrusion sleeve 3;
[0022] The three steel bar sections 2 and the two arched steel bars 4 are integrally formed into a circumferential grounding reinforcement. In this embodiment, the arched steel bars 4 are made of φ16mm diameter threaded steel and include an arc-shaped segment and two welded segments integrally formed with the arc-shaped segment. In practical use, the circumferential grounding reinforcement is electrically connected to the traction substation to ensure the functional role of the grounding system. The functional role of this grounding system mainly includes protecting personal safety, protecting equipment, improving the reliability and stability of the power system, and providing lightning protection.
[0023] To effectively ensure the functionality of the grounding system, in the above embodiments, preferably, the circumferential grounding reinforcement is introduced into the cable trough through the secondary lining side wall reinforcement to achieve comprehensive grounding of the secondary lining outer layer reinforcement 1.
[0024] To effectively ensure welding quality, in the above embodiments, preferably, the welding length between the bow-shaped steel bar 4 and the steel bar section 2 is at least 10cm.
[0025] The components described in all the above embodiments are products sold in the conventional market.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A reinforced steel structure for integrated grounding in tunnels, characterized in that: It includes a secondary lining outer layer steel reinforcement (1), which includes three steel reinforcement sections (2). Two adjacent steel reinforcement sections (2) are fixed together by an extrusion sleeve (3), and two adjacent steel reinforcement sections (2) are welded together by an arc-shaped steel reinforcement (4). The weld point between the arc-shaped steel reinforcement (4) and the steel reinforcement section (2) bypasses the extrusion sleeve (3). The three steel bar sections (2) and the two arched steel bars (4) form a circumferential grounding steel bar.
2. The reinforced concrete structure for integrated grounding in tunnels according to claim 1, characterized in that: The circumferential grounding steel bars are introduced into the cable trough through the secondary lining side wall steel bars to achieve comprehensive grounding of the secondary lining outer layer steel bars (1).
3. The reinforced concrete structure for integrated grounding in tunnels according to claim 1, characterized in that: The welding length between the bow-shaped steel bar (4) and the steel bar section (2) is at least 10 cm.