Railway multi-T-beam bridge seismic mitigation and isolation structure system easy to maintain and construction method

Abstract

The invention discloses a railway multi-T-beam bridge seismic mitigation and isolation structure system easy to maintain and a construction method. Due to the fact that a plurality of T-beams are transversely arranged on a multi-T-beam bridge, corresponding measures need to be taken for each T-beam during earthquake fortification, and the structure is complex. The structure comprises a beam part, the beam part comprises a T-beam bridge deck slab, a T-beam and a fulcrum cross partition wall are connected to the lower portion of the T-beam bridge deck slab, and the T-beam and the fulcrum cross partition wall are arranged in a spaced mode; a beam end support cross beam is arranged below the beam part, a plurality of supports and seismic mitigation and isolation devices are arranged below the beam end support cross beam, and support padstones are arranged below the supports and are arranged on a pier; the bottoms of the seismic mitigation and isolation devices are connected with the piers, and the tops of the seismic mitigation and isolation devices are embedded in the fulcrum cross partition walls and the beam-end support cross beams. Daily maintenance and post-earthquake support replacement are facilitated, and the anti-seismic performance of the bridge is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge engineering construction, and particularly relates to a railway multi-T beam bridge easy-to-maintain seismic reduction and isolation construction system and a construction method. BACKGROUND

[0002] Railways are regarded as a leading field of interconnection. In the construction of railway bridges in underdeveloped regions such as Africa, the application of multi-T beam bridges in prefabricated assembly construction is relatively wide due to various conditions such as local mechanical equipment and the quality of practitioners.

[0003] The beam weight of a single T beam of a multi-T beam bridge is about 1 / 3 of a commonly used T beam or 1 / 6 of a commonly used box beam in China, and the requirements for mechanical equipment, construction access roads, beam fields and the like during transportation and erection are relatively low, and the use is relatively flexible, and the multi-T beam bridge can be well applied to the construction of railway bridges in underdeveloped regions such as Africa. However, there is a problem to be solved in the maintenance and repair process of the multi-T beam bridge after being put into operation, that is, the replacement of the support of the multi-T beam bridge is difficult. The support of the conventional multi-T beam is directly connected to the end of the T beam, and the single T beam needs to be lifted up when the support is replaced, and then the single support is replaced. Since the T beams are connected by wet joints or cast-in-place bridge decks, the adjacent wet joints or bridge decks will generate shear forces exceeding the designed resistance when the single T beam is lifted up for replacement of the support, which is extremely unfavorable. If this situation is to be avoided, the multi-T beam needs to be lifted up synchronously by synchronous jacks, and then the damaged support needs to be replaced, and the construction process is relatively complex. Since the multi-T beam bridge is laterally provided with multiple T beams, the lateral connection between the T beams is weaker than that of the integral box beam or the conventional T beam bridge, and corresponding measures need to be taken for each T beam during seismic fortification, and the structure is relatively complex. SUMMARY

[0004] In order to make up for the shortcomings of the prior art, the application provides a railway multi-T beam bridge easy-to-maintain seismic reduction and isolation construction system and a construction method, which facilitates daily maintenance and replacement of supports after earthquakes, and improves the seismic performance of the bridge.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows: The railway multi-T beam bridge easy-to-maintain seismic reduction and isolation construction system specifically comprises: The beam part comprises a T beam bridge deck, a T beam and a fulcrum cross partition wall connected below the T beam bridge deck, and the T beam and the fulcrum cross partition wall are arranged at intervals. A beam end support cross beam is arranged below the beam part, a plurality of supports and a seismic reduction and isolation device are arranged below the beam end support cross beam, a support cushion stone is arranged below the support, and the support cushion stone is arranged on a bridge pier. The bottom of the seismic reduction and isolation device is connected with the bridge pier, and the top is embedded in the inside of the fulcrum cross partition wall and the beam end support cross beam.

[0006] Furthermore, the seismic isolation device includes a seismic isolation device base, a seismic isolation steel rod is connected to the seismic isolation device base, the top of the seismic isolation steel rod is arranged inside the embedded sleeve; a rubber gasket is arranged between the embedded sleeve and the seismic isolation steel rod.

[0007] Furthermore, the beam end support crossbeam and the multiple T-beams are connected by embedded sleeves or embedded connecting keys.

[0008] Furthermore, the support is connected to the beam end support crossbeam and the support pad stone using a support sleeve.

[0009] Furthermore, the support is a steel support or a seismic isolation support.

[0010] Furthermore, the spacing and number of the supports arranged laterally are adjusted according to the force applied to the beams supported by the beam ends.

[0011] Furthermore, the beam end supporting cross beam adopts a reinforced concrete structure or a prestressed concrete structure.

[0012] Furthermore, the number of the seismic isolation devices is designed according to specific seismic requirements.

[0013] The construction method of the easy-to-maintain seismic isolation structural system of a railway multi-T beam bridge comprises the following steps: Step 1: Cast the support stone of the bridge on the pier and install the bearing on the support stone; Step 2: Install the beam end support beam on the support; Step 3: Install multiple T beams on the beam end support beams; Step 4: Cast-in-place T-beam bridge deck and support diaphragm walls; Step 5: During the operation of the railway, when replacing multiple supports and seismic isolation devices, lift the beam end support crossbeam, then replace the damaged supports or seismic isolation devices to complete the maintenance of the seismic isolation structure system.

[0014] Beneficial effects of the present invention: 1) The present invention provides a beam end support crossbeam between multiple T-beams and supports, which facilitates daily maintenance and replacement of supports after an earthquake, solving the problem of difficult replacement of supports for conventional railway multiple T-beams. 2) The present invention forms a seismic isolation system by arranging a seismic isolation device and a support, thereby improving the economy, maintainability and seismic performance of the railway multi-T beam during its long life cycle; 3) The seismic isolation system of the present invention can flexibly design the support type and the number of seismic isolation devices according to specific seismic isolation requirements, and has good economic performance; 4) The structural system of the present invention has a clear and concise force response, a simple structure, and is easy to implement, and has broad application prospects in the field of bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view of the railway multi-T beam bridge at the end support point of the present invention; Figure 2 This is a plan view of the end support points of the railway multi-T beam bridge of the present invention; Figure 3 It is a partial elevation view of the end support of the railway multi-T beam bridge of the present invention; Figure 4 This is a partial elevation view of the seismic isolation device at the end of the railway multi-T beam bridge of the present invention; Figure 5 This is a structural diagram of the railway multi-T beam bridge end seismic isolation device of the present invention; In the figure: 1-T beam bridge deck, 2-T beam, 3-support cross diaphragm, 4-beam end support cross beam, 5-support, 6-support pad stone, 7-seismic isolation device, 8-bridge pier, 7-1-embedded sleeve, 7-2-rubber washer, 7-3-seismic isolation steel rod, 7-4-seismic isolation device foundation. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to specific embodiments.

[0017] The present invention aims to solve the problems faced in seismic isolation design and support maintenance and replacement of multi-piece T-beam bridges on railways. By arranging beam end support cross beams between the multi-piece T-beams and the supports, daily maintenance and replacement of supports after an earthquake are facilitated. Seismic isolation devices are arranged in the support cross partition walls and the beam end support cross beams, thereby improving the seismic resistance of the bridge.

[0018] like Figure 1 As shown, the easy-to-maintain seismic isolation structural system of a railway multi-T beam bridge of the present invention includes a beam portion, which includes a T beam bridge deck 1, a T beam 2 and a support cross diaphragm 3 connected below the T beam bridge deck 1, and the T beam 2 and the support cross diaphragm 3 are arranged at intervals; like Figure 2 、 3 As shown, a beam end support beam 4 is provided under the beam portion, and the beam end support beam 4 is connected to the prefabricated multi-piece T-beam 2 by using embedded sleeves or embedded connecting keys. The beam end support beam 4 adopts a reinforced concrete structure or a prestressed concrete structure, and the beam end support beam laterally and evenly distributes the support reaction force of the multi-T beam bridge; a plurality of supports 5 and a seismic isolation device 7 are provided under the beam end support beam 4, and a support pad stone 6 is provided under the support 5, and the support pad stone 6 is provided on the bridge pier 8; the support 5 is connected to the beam end support beam 4 and the support pad stone 6 by a support sleeve.

[0019] like Figure 4 As shown, the bottom of the seismic isolation device 7 is connected to the bridge pier 8, and the top is buried inside the supporting cross wall 3 and the beam end support beam 4, connecting the beam part and the bridge pier.

[0020] like Figure 5 As shown, the seismic isolation device 7 includes a seismic isolation device base 7-4, a seismic isolation steel rod 7-3 is connected to the seismic isolation device base 7-4, and the top of the seismic isolation steel rod 7-3 is arranged inside the embedded sleeve 7-1; a rubber gasket 7-2 is arranged between the embedded sleeve 7-1 and the seismic isolation steel rod 7-3.

[0021] Depending on the load requirements, supports 5 can be conventional steel supports or seismic isolation supports. The spacing and number of supports 5 arranged transversely are adjusted based on the loads on the beam ends supporting crossbeams 4, and do not need to be arranged strictly in accordance with the number of T-beams. The number of seismic isolation devices 7 is designed based on the specific seismic requirements.

[0022] The present invention also provides a construction method for an easy-to-maintain seismic isolation structural system for a railway multi-T beam bridge, comprising the following steps: Step 1: Cast the support pedestal 6 of the bridge on the pier 8, and install the support 5 on the support pedestal 6; Step 2: Install the beam end support beam 4 on the support 5; Step 3: Install multiple T beams 2 on the beam end support beam 4; Step 4: Cast in situ the T-beam bridge deck 1 and the support diaphragm 3 to complete the construction of the railway multi-T-beam bridge structure; Step 5: During the operation of the railway, when replacing multiple supports 5 and seismic isolation devices 7, lift the beam end support beam 4, and then replace the damaged supports 5 or seismic isolation devices 7 to complete the maintenance of the seismic isolation structure system.

[0023] In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections 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 in specific contexts.

[0024] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges is characterized by: The bridge comprises a beam portion, wherein the beam portion comprises a T-beam bridge deck (1), a T-beam (2) and a support transverse diaphragm (3) are connected below the T-beam bridge deck (1), and the T-beam (2) and the support transverse diaphragm (3) are arranged at intervals; A beam end support crossbeam (4) is provided below the beam portion, a plurality of supports (5) and a seismic isolation device (7) are provided below the beam end support crossbeam (4), a support pad stone (6) is provided below the support (5), and the support pad stone (6) is provided on the bridge pier (8); The bottom of the seismic isolation device (7) is connected to the bridge pier (8), and the top is embedded in the support cross partition wall (3) and the beam end support cross beam (4).

2. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 1 is characterized by: The seismic isolation device (7) comprises a seismic isolation device base (7-4), a seismic isolation steel rod (7-3) is connected to the seismic isolation device base (7-4), the top of the seismic isolation steel rod (7-3) is arranged inside the embedded sleeve (7-1), and a rubber gasket (7-2) is arranged between the embedded sleeve (7-1) and the seismic isolation steel rod (7-3).

3. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 2 is characterized by: The beam end support crossbeam (4) and the multiple T-beams (2) are connected by using pre-embedded sleeves or pre-embedded connecting keys.

4. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 3 is characterized by: The support (5) is connected to the beam end support crossbeam (4) and the support pad stone (6) by using a support sleeve.

5. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 4 is characterized in that: The support (5) is a steel support or a vibration-isolating support.

6. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 5 is characterized by: The spacing and number of the supports (5) arranged laterally are adjusted according to the force applied to the beam end supporting the crossbeam (4).

7. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 6, characterized in that: The beam end supporting cross beam (4) adopts a reinforced concrete structure or a prestressed concrete structure.

8. The easy-to-maintain seismic isolation structure system for railway multi-T beam bridges according to claim 7 is characterized by: The number of the seismic isolation devices (7) is designed according to specific seismic requirements.

9. A construction method for an easy-to-maintain seismic isolation structure system for a railway multi-T beam bridge, characterized by: The steps include: Step 1: Casting the support pedestal (6) of the bridge on the pier (8), and installing the support (5) on the support pedestal (6); Step 2: Install the beam end support crossbeam (4) on the support (5); Step 3: Install multiple T-beams (2) on the beam end support beam (4); Step 4: Cast in situ T-beam bridge deck (1) and support diaphragm wall (3); Step 5: During the operation of the railway, when replacing multiple supports (5) and the seismic isolation device (7), the beam end support crossbeam (4) is lifted up, and then the damaged supports (5) or seismic isolation device (7) are replaced to complete the maintenance of the seismic isolation structural system.

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