CN-122013662-A - Composite metal water stop for expansion joint of high-speed railway bridge and installation method

CN122013662ACN 122013662 ACN122013662 ACN 122013662ACN-122013662-A

Abstract

The invention relates to the technical field of water stops, in particular to a composite metal water stop for a high-speed railway bridge expansion joint and an installation method thereof, and solves the problems that an existing high-speed railway bridge water stop interface is easy to debond and corrode, anchoring is loose, operation and maintenance cost is high, and maintenance is difficult. The water stop belt comprises a U-shaped corrugated cold-rolled composite bimetallic base material, wherein a nickel-based diffusion barrier layer is arranged on the base material, a gradient functional interface layer formed by a sacrificial anode layer, an insulating passivation layer and a self-lubricating bonding layer is coated between the base material and a sealing main body, and the metal base material is inserted and assembled with a fixed side plate in a box girder expansion joint through fixing strips at two ends. The cold-rolled composite bimetal substrate is matched with the nickel-based diffusion barrier layer, so that the structural strength and corrosion resistance are ensured, brittle compounds formed at a composite interface are avoided, the interface binding force is improved, the U-shaped structure is matched with the longitudinal corrugated deformation design, the stress can be uniformly dispersed, sufficient allowance is provided for the expansion and contraction deformation of a bridge, and the multi-dimensional deformation requirements caused by the temperature change and the load of the beam are met.

Inventors

DONG SHENGLI
SHI ZHIJIE
YU CHUSHENG
ZHANG HONGBO
GENG KUN
HOU ZHIGANG
ZHANG SONGHE
LV SONG
ZHAO SHAOYONG
ZHANG QIMING
ZHANG AILI
LIU PEIXIN
MA XIAOHUA
LV CHAO

Assignees

河南省郑工实业有限公司

Dates

Publication Date: 20260512
Application Date: 20260325

Claims (7)

1. A composite metal water stop for a high-speed rail bridge expansion joint, comprising: the metal base material is a U-shaped composite metal plate with a corrugated deformation structure; The fixed side plates are anchored in expansion joints of the box girders, and the metal base material is installed through the fixed side plates; The sealing main body is compounded with the metal base material through a self-lubricating bonding layer, and at least two mutually independent cavities which extend along the length direction of the water stop belt are arranged in the sealing main body, wherein the sealing main body comprises an early warning cavity close to the water facing side and a buffer cavity close to the water backing side; The gradient functional interface layer is coated on the surface of the composite area of the metal substrate and the sealing main body and comprises a sacrificial anode layer, an insulating passivation layer and a self-lubricating bonding layer which are sequentially arranged outwards from the surface of the metal substrate.
2. The composite metal water stop for the expansion joint of the high-speed railway bridge according to claim 1, wherein the metal base material is a cold-rolled composite bimetallic plate and comprises a structural base layer and a corrosion-resistant surface layer, a diffusion barrier layer is arranged between the structural base layer and the corrosion-resistant surface layer, and the diffusion barrier layer is a nickel-based plating layer.
3. The composite metal water stop for a high-speed railway bridge expansion joint according to claim 1, wherein the corrugated deformation structure is a longitudinal corrugation extending in the expansion and contraction direction of the bridge.
4. The composite metal water stop for the expansion joint of the high-speed railway bridge according to claim 1, wherein the sacrificial anode layer is made of zinc-aluminum-magnesium-rare earth alloy, the insulating passivation layer is a silane insulating layer, and the self-lubricating bonding layer is a modified rubber layer containing solid lubricating particles.
5. The composite metal water stop for the expansion joint of the high-speed railway bridge according to claim 1, wherein the fixing side plates are positioned on the inner sides of the two end vertical faces of the U-shaped metal base material, fixing grooves are formed in the outer sides of the fixing side plates, fixing strips matched with the fixing grooves in size are arranged on the two end vertical faces of the metal base material, the metal base material is inserted into the fixing grooves through the fixing strips, anchoring holes are formed in the fixing side plates and the metal base material, and the fixing side plates and the metal base material are anchored in the expansion joint of the box girder after being installed.
6. The composite metal water stop for the expansion joint of the high-speed railway bridge according to claim 1, wherein the bottom of the early warning cavity is provided with a one-way drain valve, and the opening direction of the one-way drain valve is from the inside of the cavity to the outside of the cavity.
7. A method for installing a composite metal water stop for a high-speed railway bridge expansion joint, which is applied to the composite metal water stop according to any one of claims 1 to 6, and is characterized by comprising the following steps: S1, pretreating an expansion joint, cleaning an installation notch of the expansion joint of a box girder, and ensuring that the inner wall of the notch is smooth and free of impurities and rust; S2, preassembling the fixed side plate, anchoring the fixed side plate at a preset installation position of the expansion joint of the box girder, and ensuring the installation verticality and levelness of the fixed side plate; S3, assembling a water stop main body, namely inserting a fixing strip of the metal base material into a fixing groove of the fixing side plate to finish positioning and matching of the metal base material and the fixing side plate; s4, anchoring and reinforcing, namely installing anchoring parts into expansion joints of the box girder through anchoring holes, integrally anchoring the fixed side plates and the metal base materials in the expansion joints, and reserving deformation allowance in the expansion direction of the bridge for the metal base materials in the assembly process; S5, sealing treatment, namely sealing and filling the fit gap between the fixing groove and the fixing strip and the connection part between the water stop main body and the expansion joint; and S6, debugging the functional component to finish the on-off test of the one-way drain valve of the early warning cavity.

Description

Composite metal water stop for expansion joint of high-speed railway bridge and installation method Technical Field The invention relates to the technical field of water stops, in particular to a composite metal water stop for a high-speed railway bridge expansion joint and an installation method. Background Along with the continuous large-scale construction of a high-speed railway network and the improvement of long-period safe operation requirements, a large-span and high-smoothness bridge becomes a core component part of a high-speed railway line, and a bridge expansion joint is used as a key structure for compensating the deformation of the body temperature, the deformation of the load and the shrinkage and creep of concrete, and the water-stopping sealing performance of the bridge expansion joint directly determines the durability of a lower structure of the bridge, the operation safety of the high-speed railway line and the full life cycle operation and maintenance cost. The water stop strip is used as a core functional component of the expansion joint water stop system, and is used in a high-speed railway outdoor complex environment for a long time, so that the water stop strip is required to bear continuous high-frequency micro-vibration caused by large-amplitude temperature change circulation, acid rain and snow-melting agent corrosion and train passing, and is also required to adapt to Liang Tiduo-dimension complex deformation, and severe technical requirements far exceeding those of common highway bridges are provided for deformation adaptation capability, long-term sealing performance, corrosion resistance durability and operation and maintenance convenience. The conventional waterstop in the expansion joint engineering of the high-speed railway bridge is mainly divided into three categories, namely a pure rubber waterstop, a common metal waterstop and a metal-rubber composite waterstop, wherein technical bottlenecks which are difficult to consider exist in practical engineering application, the high-speed railway bridge Liang Changyong waterstop commonly has the problems that a metal substrate composite interface is easy to split in a layering manner, a metal-rubber composite interface is easy to debond and corrode, a sealing structure has no leakage early warning allowance, an anchoring structure is easy to slip and loosen, and the like, so that the double requirements of Cheng Changxiao service and low-cost operation and maintenance of a high-speed railway are difficult to meet, and the long-acting service and operation and maintenance requirements of the high-speed railway line cannot be completely adapted. Disclosure of Invention Aiming at the problems and defects of debonding corrosion, easy loosening of anchoring and high operation and maintenance cost of a high-speed railway bridge water stop interface, the invention provides a composite metal water stop for a high-speed railway bridge expansion joint and an installation method thereof, and the sealing durability and the deformation suitability of the water stop are improved through multi-structure cooperative optimization, so that the modularized online operation and maintenance is realized, and the long-acting service requirements of the high-speed railway are adapted. The invention solves the technical problems by adopting a scheme that a composite metal water stop belt for a high-speed railway bridge expansion joint comprises: the metal base material is a U-shaped composite metal plate with a corrugated deformation structure; The fixed side plates are anchored in expansion joints of the box girders, and the metal base material is installed through the fixed side plates; The sealing main body is compounded with the metal base material through a self-lubricating bonding layer, and at least two mutually independent cavities which extend along the length direction of the water stop belt are arranged in the sealing main body, wherein the sealing main body comprises an early warning cavity close to the water facing side and a buffer cavity close to the water backing side; The gradient functional interface layer is coated on the surface of the composite area of the metal substrate and the sealing main body and comprises a sacrificial anode layer, an insulating passivation layer and a self-lubricating bonding layer which are sequentially arranged outwards from the surface of the metal substrate. Further, the metal substrate is a cold-rolled composite bimetallic plate and comprises a structure base layer and a corrosion-resistant surface layer, a diffusion barrier layer is arranged between the structure base layer and the corrosion-resistant surface layer, and the diffusion barrier layer is a nickel-based plating layer. Further, the corrugated deformation structure is a longitudinal corrugation extending along the expansion and contraction direction of the bridge. Furthermore, the sacrificial anode layer is made of zinc-aluminum-magnesium-rar