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CN-122013682-A - Pier reinforcing device and construction method thereof

CN122013682ACN 122013682 ACN122013682 ACN 122013682ACN-122013682-A

Abstract

The invention relates to the technical field of pier reinforcement engineering, in particular to a pier reinforcement device and a construction method thereof; the device includes annular strap, fastening screw and hoop shell, and the three is made by high strength steel, strap one end and hoop shell integrated into one piece, and the other end is the free end, and strap and hoop shell are equipped with the helicitic texture that agrees with mutually with fastening screw respectively, realize the hoop of strap and tighten up. During construction, the outer wall treatment of the bridge pier and the paving of the rubber protection layer are finished, then the device is wrapped and assembled with the fastening assembly, target prestress is determined based on quantitative calculation, the prestress is applied in a 'pretension-final screwing' grading mode, and finally protection sealing and acceptance are carried out, so that a plurality of devices can be distributed along the height direction of the bridge pier. The bridge pier axial bearing capacity can be obviously improved, the structural safety and durability are ensured, and the bridge pier axial bearing capacity reinforcing device is suitable for reinforcing and reforming various concrete bridge piers.

Inventors

  • ZHAO YULONG
  • GUAN XINMIN
  • TANG XU
  • ZHOU LIPENG
  • REN HAITAO
  • LIU SHENGBIN
  • WANG HUILI
  • XU YINGWEI
  • QIN YONG
  • JIANG XIDONG
  • MAO ZIGANG
  • ZHANG YUHAO

Assignees

  • 中国铁建大桥工程局集团有限公司
  • 中铁建大桥工程局集团西北工程有限公司
  • 大连理工大学

Dates

Publication Date
20260512
Application Date
20260122

Claims (10)

  1. 1. A pier reinforcement device, comprising: the hoop (3) is provided with a plurality of threaded holes, and is wound around the periphery of the pier to be reinforced when in use; The fastening screw (2) is provided with a screw thread matched with the screw hole of the strap (3) in a processing way; The hoop shell (1) is internally provided with a thread groove matched with the screw thread of the rod body of the fastening screw (2), the hoop shell (1) and one end of the hoop belt (3) are integrally formed, the other end of the hoop belt (3) is a free end, the free end stretches into the hoop shell (1), and tightening and fastening of the hoop belt (3) are realized through the threaded hole matching of the fastening screw (2) and the hoop belt (3).
  2. 2. A pier reinforcing device according to claim 1, characterized in that the effective thickness t of the band (3) is much smaller than the radius R of the pier (5) to be reinforced.
  3. 3. A construction method based on the pier reinforcing device of claim 1 or 2, comprising the steps of: checking the disease position of the bridge pier (5), marking the installation elevation and the circumferential positioning line of the bridge pier reinforcing device (4), building a temporary support, setting protective measures and checking construction equipment; cleaning and polishing the outer wall (6) of the bridge pier (5), repairing local defects, wrapping a rubber protective layer with the same width as the hoop (3) in a surrounding manner, and fixing; The bridge pier reinforcing device (4) is wrapped around the outer side of the rubber protective layer, and the levelness and the fitting degree of the hoop (3) are adjusted, so that the free end of the hoop (3) penetrates through the hoop shell (1) to form a closed ring; the fastening screw rod (2) passes through the hoop shell (1) to be meshed with a thread groove of the hoop shell (1) and a thread hole of the hoop belt (3); the fastening screw (2) is rotated, a target pulling force is applied in a 'pre-tightening-re-tightening-final-tightening' grading mode, the fastening screw (2) is locked in a loose manner after the design pulling force is achieved, and the length of the redundant strap (3) is fixed; and (3) removing oil and rust on the outer surface of the pier reinforcing device (4), and spraying an epoxy glue layer.
  4. 4. A construction method of a pier reinforcing device according to claim 3, wherein the target tension is enhanced according to a target strength And (3) determining: Wherein R is the radius of the bridge pier (5), b is the effective width of the hoop (3), Is the poisson ratio of the concrete of the bridge pier (5), For the circumferential uniformity coefficient to be uniform, Is an effective force transmission coefficient.
  5. 5. The method for constructing a pier reinforcing device according to claim 4, wherein the effective force transmission coefficient is Wherein The fitting coefficient is less than or equal to 0.80 ≤1.00, The coefficient of tension loss is 0 to less than or equal to ≤0.20。
  6. 6. The method for constructing a pier reinforcing device according to claim 4, wherein the circumferential uniformity coefficient is , Is an empirical coefficient of 0.5 to less than or equal to ≤2.0, The circumferential strain discrete coefficient of the band (3).
  7. 7. A construction method of a pier reinforcing device according to claim 3, wherein the tension force P is indirectly controlled by the tightening torque T of the tightening screw (2), and the relation between the torque and the tension force is: , is an empirical torque coefficient of 0.10-0 ≤0.30, Is the nominal diameter of the fastening screw (2).
  8. 8. A construction method of a pier reinforcing device according to claim 3, wherein when n pier reinforcing devices (4) are arranged in the height direction of the pier (5), the total axial bearing capacity is increased Wherein , Is the cross-sectional area of the bridge pier (5), In order for the coefficients of the interactions to be related, , Is an empirical coefficient of 0.3 to less than or equal to And s is the net distance between adjacent bridge pier reinforcing devices (4) and is less than or equal to 1.5.
  9. 9. A method of constructing a pier reinforcing device according to claim 3, wherein the band (3) is of practically equivalent constrained compressive stress to the pier outer wall (6) And (2) and ≤ , In order for the force transfer coefficient to be effective, Is a local bearing coefficient of 0.60-0% ≤1.00, The design value of the compressive strength of the concrete of the bridge pier (5) is obtained.
  10. 10. A construction method of a pier reinforcing device according to claim 3, wherein the tensile stress of the section of the band (3) is as follows: Wherein, the For the effective thickness of the band (3), Stress the band (3) material Xu Yongla, The safety coefficient is 1.10-less ≤2.00。

Description

Pier reinforcing device and construction method thereof Technical Field The invention relates to the technical field of pier reinforcement engineering, in particular to a pier reinforcement device which is applicable to various types of piers, has a controllable reinforcement effect and is convenient to construct and a construction method thereof. Background The bridge is used as a key component of a transportation infrastructure and bears the passing demands of a large number of vehicles and pedestrians, and the bridge pier is a core member for supporting a bridge structure. In the established bridge, due to the factors of imperfect early design specifications, defects in construction, structural damage and aging caused by long-term operation, change of using functions and the like, diseases such as surface falling off, concrete cracking, reinforcement corrosion and the like of the bridge pier are easy to occur, so that the problems of insufficient bridge bearing capacity, reduced earthquake resistance and the like are caused, the safe operation and the service life of the bridge are seriously influenced, and therefore, effective reinforcement and reconstruction of the diseased bridge pier are needed. At present, various pier reinforcement technologies have been developed at home and abroad, including a cross section increasing reinforcement technology, an embedded reinforcement technology, an external tension reinforcement technology, a steel sleeve reinforcement technology, an FRP reinforcement technology, a wire winding reinforcement technology, a dog bone-shaped rib repairing longitudinal rib technology and the like. The reinforced steel sleeve reinforcing technology has the advantages that the cross section area of the member is enlarged, the reinforcement is increased, the stability is improved, the construction period is long, the influence on the surrounding environment is large, the embedded reinforcing technology depends on resin bonding materials, the long-term durability is obviously influenced by environmental factors, the external tension reinforcing technology can radically relieve the crack problem, but the system structure is complex, the cost is high, the steel sleeve reinforcing technology can increase the cross section area and the dead weight of a pier, the under-bridge passing is influenced to a certain extent, the FRP reinforcing technology has the defects of insufficient shearing resistance, high-temperature easy aging and the like, the winding uniformity of the wire winding reinforcing technology is difficult to control, and the dog-bone-shaped rib repairing longitudinal rib technology is mainly applicable to specific diseases caused by the fracture of longitudinal ribs and has a narrow application range. The related patents also have a plurality of defects, such as that the bridge pier reinforcing device disclosed in the China patent CN110468745A needs to be combined with an actual bridge pier for prefabrication, the general adaptability is poor, and the Chinese patent CN102108680B adopts a reinforcing mode of combining a composite sleeve and epoxy mortar, and has the advantages of high strength and long service life, but also increases the cross-sectional area and dead weight of the bridge pier, influences traffic and has higher construction cost. Disclosure of Invention The invention aims to provide a pier reinforcing device and a construction method thereof, which solve the problems that the existing reinforcing device is poor in adaptability, uncontrollable in reinforcing effect, complex in construction, capable of increasing the dead weight of a pier and the like. In order to achieve the above purpose, the technical scheme of the application is that the pier reinforcing device comprises: The hoop is provided with a plurality of threaded holes and is wound around the periphery of the pier to be reinforced when in use; The rod body of the fastening screw is provided with threads matched with the threaded holes of the hoops; The hoop shell is internally provided with a thread groove matched with the thread of the fastening screw rod body, the hoop shell and one end of the hoop belt are integrally formed, the other end of the hoop belt is a free end, and the free end stretches into the interior of the hoop shell and is matched with the threaded hole of the hoop belt through the screwing fastening screw rod, so that tightening and fastening of the hoop belt are realized. In a further embodiment of the invention, the effective thickness t of the band is substantially smaller than the radius R of the pier to be reinforced. The invention also provides a construction method of the pier reinforcing device, which comprises the following steps: Checking the disease parts of the bridge piers, marking the installation elevation and the circumferential positioning line of the bridge pier reinforcing device, building a temporary support, setting protective measures and checking construction