CN-122013687-A - Concrete hollow slab girder bridge reinforcing method and system based on bridge deck truss prestress

CN122013687ACN 122013687 ACN122013687 ACN 122013687ACN-122013687-A

Abstract

The invention belongs to the technical field of bridge maintenance and reinforcement, and discloses a concrete hollow slab girder bridge reinforcement method and system based on bridge deck truss prestress. The bridge girder construction method comprises the steps of removing existing concrete guardrails to expose cantilever sections on the outer sides of side plates, installing bridge deck reaction trusses on two sides of a bridge deck, arranging lower transverse supporting members on the bottom of the bridge deck, penetrating tensioning pieces into vertical cable penetrating pipes to enable the lower ends of the tensioning pieces to be connected with the lower transverse supporting members, applying tensioning force to the tensioning pieces through upper end tensioning anchor assemblies and locking the tensioning pieces to enable the lower transverse supporting members to be pressed upwards against the bottoms of the plurality of hollow plate girders, and reserving the bridge deck reaction trusses to form bridge side protection boundaries. The invention can improve the transverse overall stress state of the bridge, lighten the sinking of the middle part of the bridge deck, inhibit the cracking between plates and the development of single plate cracks, and is mainly applied to the bridge with difficult construction under the bridge because the main construction procedures are completed on the bridge deck.

Inventors

ZHANG JINZE
GUO TIAN
ZHAO JIANHUA
LU NAN

Assignees

西安世纪金属结构有限公司

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (10)

1. The concrete hollow slab beam bridge reinforcing method based on bridge deck truss prestress is characterized by comprising the following steps of: Dismantling the existing concrete guardrail and exposing the cantilever sections outside the side plates of the outermost hollow plate beams; the bridge deck reaction truss is respectively arranged at two sides of the bridge deck and comprises an upper chord member, a lower chord member, an inclined web member and a vertical cable penetrating pipe, and is fixed on the cantilever section at the outer side of the side plate by means of a bridge deck anchoring assembly; Arranging a lower transverse supporting member at the bottom of the bridge, wherein the lower transverse supporting member transversely extends along the bridge and is positioned below the bottoms of the plurality of hollow slab beams; the lower end of the tensioning piece penetrates through the connecting hole on the lower transverse supporting member, a lower anchoring head and a lower anti-falling plate are arranged on the lower side of the lower transverse supporting member, and the upper end of the tensioning piece penetrates out of the top of the vertical rope penetrating pipe; installing an upper-end tensioning anchor assembly at the top of the vertical rope penetrating pipe, applying tensioning force to the upper end of the tensioning piece by adopting a jack, and locking the tensioning piece by using the upper-end tensioning anchor assembly after the preset tensioning force is reached; the locked tension piece is kept in a tension state, and the lower transverse supporting member moves upwards and presses against the bottoms of the plurality of hollow plate beams; The bridge deck reaction truss is reserved along two sides of the bridge deck, and the top of the bridge deck reaction truss is higher than the surface of the bridge deck pavement layer, so that a bridge side protection boundary is formed.
2. The bridge deck truss prestress-based concrete hollow slab beam bridge reinforcing method is characterized in that existing concrete guardrails are removed along the longitudinal whole section of a bridge or removed at intervals along the longitudinal section of the bridge, the bridge deck counter-force trusses and the lower transverse supporting members are arranged corresponding to a middle sinking area of the bridge deck, an inter-slab joint cracking area or a single-piece hollow slab beam cracking area, and one or more groups of bridge deck counter-force trusses and the lower transverse supporting members are arranged in the same bridge span along the longitudinal direction of the bridge.
3. The reinforcing method for the concrete hollow slab girder bridge based on the prestress of the bridge deck truss, which is disclosed in claim 1, is characterized in that the upper chord member, the lower chord member and the inclined web member form a continuous truss unit, the vertical cable penetrating pipe is arranged at or near a truss node, the bridge deck counter-force truss is of a welded integral structure or of a factory prefabricated and field assembled sectional structure, and stiffening members or limiting members are arranged at local nodes of the bridge deck counter-force truss.
4. The method for reinforcing the concrete hollow slab girder bridge based on the prestress of the bridge deck truss as claimed in claim 1, wherein the bridge deck anchoring assembly comprises a connecting bottom plate, an anchor bolt and a stiffening plate, the connecting bottom plate is arranged at the bottom of the bridge deck reaction truss, the anchor bolt penetrates through the connecting bottom plate and then is anchored into the cantilever section at the outer side of the side plate, and the stiffening plate is connected between the bridge deck reaction truss and the connecting bottom plate.
5. The reinforcing method of the concrete hollow slab girder bridge based on the prestress of the bridge deck truss, which is disclosed in claim 1, is characterized in that the tensioning piece is a steel rope, a steel strand or a high-strength pull rod, the upper end tensioning and anchoring assembly comprises an upper bearing plate and an upper anchor, the upper bearing plate is arranged at the top of a vertical rope penetrating pipe, the upper anchor is arranged above the upper bearing plate, the lower anchor head and the lower anti-drop plate are arranged on the lower side of the lower transverse bearing member, and a gasket or a backing plate is arranged between the lower anchor head and the lower anti-drop plate.
6. The reinforcing method for the concrete hollow slab girder bridge based on the prestress of the bridge deck truss, which is disclosed in claim 1, is characterized in that the lower transverse supporting members are square tubes, box girders, I-beams, channel girders or combined supporting girders, steel backing plates, rubber cushion blocks or metal cushion blocks are arranged between the lower transverse supporting members and the bottoms of the hollow slab girders, and one or more lower transverse supporting members are arranged in the same bridge span.
7. The concrete hollow slab beam bridge reinforcing system based on the prestress of the bridge deck truss is characterized by comprising a concrete hollow slab beam bridge, a bridge deck counter-force truss, a bridge deck anchoring assembly, a tensioning piece, a lower transverse supporting member, an upper tensioning anchoring assembly and a lower anchoring head; the concrete hollow slab beam bridge comprises a plurality of hollow slab beams which are transversely arranged in parallel along the bridge, a slab joint is formed between adjacent hollow slab beams, and a side slab outer cantilever section is formed at the outer side of the outermost hollow slab beam; the bridge deck reaction truss is at least provided with two groups, the two groups of bridge deck reaction trusses are respectively arranged on two sides of the bridge deck, and the bridge deck reaction truss is fixed on the cantilever section on the outer side of the side plate through the bridge deck anchoring assembly; The lower transverse supporting member transversely extends along the bridge and is positioned below the bottoms of the plurality of hollow slab beams; the tensioning piece vertically penetrates through the bridge deck counter-force truss, and the lower end of the tensioning piece penetrates through the lower transverse supporting member to be connected with the lower anchoring head; The upper end of the tensioning piece penetrates out of the upper portion of the bridge deck counter-force truss and then is connected with the upper end tensioning anchor assembly, and when the tensioning piece is in a tensioning locking state, the lower transverse supporting members are pressed against the bottoms of the hollow slab beams.
8. The concrete hollow slab girder bridge reinforcement system based on bridge deck girder prestress according to claim 7, wherein the bridge deck reaction girder comprises an upper chord member, a lower chord member, an inclined web member and a vertical cable penetrating pipe, the upper chord member, the lower chord member and the inclined web member of the bridge deck reaction girder form a continuous girder unit together, the vertical cable penetrating pipe is arranged at or near a girder node, and the tension member is penetrated in the vertical cable penetrating pipe.
9. The bridge deck truss pre-stressing concrete hollow slab girder bridge reinforcing system according to claim 7, wherein the bridge deck anchoring assembly comprises a connecting bottom plate, anchor bolts and stiffening plates, the upper end tensioning anchoring assembly comprises an upper bearing plate and an upper anchorage, and a lower anti-drop plate is arranged between the lower anchoring head and the lower transverse bearing member.
10. The bridge deck truss prestress-based concrete hollow slab beam bridge reinforcing system is characterized in that the bridge deck reaction trusses are arranged corresponding to a sinking zone in the middle of a bridge deck, a joint cracking zone between plates or a single hollow slab beam cracking zone, one or more groups of bridge deck reaction trusses are longitudinally arranged in the same bridge span along the bridge, one or more lower transverse supporting members are arranged at the bottom of the bridge corresponding to each group of bridge deck reaction trusses, and a protective panel, a protective net or an accessory railing structure is arranged outside the bridge deck reaction trusses.

Description

Concrete hollow slab girder bridge reinforcing method and system based on bridge deck truss prestress Technical Field The invention relates to the technical field of bridge maintenance and reinforcement, in particular to a concrete hollow slab girder bridge reinforcement method and system based on bridge deck truss prestress. Background The concrete hollow slab girder bridge has relatively simple structure, convenient prefabrication and installation, higher construction efficiency and moderate engineering cost, and can be widely applied to highway bridges and municipal bridges. Especially in the middle and small span bridge, the assembled reinforced concrete hollow slab girder bridge and the prestressed concrete hollow slab girder bridge are used as common bridges for a long time. The bridge is generally formed by arranging a plurality of hollow plate beams in parallel along the transverse direction of the bridge to form a bridge deck superstructure, and loads are jointly transmitted between adjacent hollow plate beams through hinge joints, bridge deck pavement layers and related connection parts, so that a certain transverse overall stress capacity is formed. Along with the increase of service life of the bridge, the concrete hollow slab girder bridge is easy to generate various structural diseases under the common influence of the factors such as repeated action of vehicle load, overload transportation, environmental erosion, structural aging, and original transverse connection performance attenuation. Common diseases include sinking of the middle part of the bridge deck, cracking between adjacent hollow plate beams, cracking of a bridge deck pavement layer along a plate seam position, cracking of a single hollow plate beam bottom plate or a web plate, crack expansion caused by abnormal stress of local components, and the like. The diseases are mutually influenced, so that the transverse cooperative stress capability of the upper structure of the bridge can be weakened, the integrity, durability and travelling comfort of the bridge can be further reduced, and even the normal operation safety of the bridge is influenced when serious. The existing treatment mode for the concrete hollow slab girder bridge diseases adopts the means of crack sealing, pressure grouting, bridge deck pavement repair, steel plate pasting, fiber composite material pasting, lower support adding or partial replacement component adding and the like. The technical measures can repair local cracks or local damaged parts under certain conditions, but have the problem of insufficient pertinence for the problems of sinking of the middle part of the bridge deck, cracking between plates, and the reduction of the cooperative working capacity of a plurality of hollow plate beams caused by insufficient transverse overall stress. Particularly, when only the crack body is sealed or poured, although apparent diseases can be improved to a certain extent, the transverse bearing and cooperative working capacity of the hollow slab bridge is difficult to recover or enhance from the overall stress angle, so that the occurrence or the sustainable development of the diseases is difficult to effectively inhibit. In addition, the conventional partial reinforcement method requires construction work on the bottom of the bridge, such as installation of a support system on the bottom of the bridge, installation of reinforcement members, and the like. For a high pier bridge, a cross-furrow bridge or a bridge with limited under-bridge construction conditions, construction from the lower organization of the bridge generally has the problems of difficult layout of a working surface, high-altitude operation risk, longer construction period, complex traffic organization, higher construction cost and the like. In some existing bridges, the topography under the bridge is complex, or the clearance under the bridge is higher, the implementation difficulty of the traditional lower construction mode is higher, the safety guarantee requirement is higher, and the popularization and the application of the related reinforcement technology are restricted. Therefore, how to provide a reinforcing method and system which can be implemented mainly by depending on the bridge deck, can carry out transverse integral bearing on a concrete hollow slab girder bridge, and is suitable for the working condition of high pier or under-bridge construction difficulty becomes the technical problem to be solved in the field. Disclosure of Invention The invention provides a concrete hollow slab girder bridge reinforcing method and system based on bridge deck truss prestress, which are used for solving the problems that in the prior art, the integral reinforcing effect on the defects of sinking of the middle part of a concrete hollow slab girder bridge deck, cracking between slabs, single slab cracks and the like is insufficient, reinforcing construction depends on underbridge operation more, imple