CN-117661470-B - Control method and device for bridge deck pavement reinforcing steel mesh top surface protection layer

CN117661470BCN 117661470 BCN117661470 BCN 117661470BCN-117661470-B

Abstract

The present invention belongs to a control method and device for the top protective layer of steel mesh in bridge deck pavement. The method adopts adjusting the lower end of each limit benchmark on the steel mesh protection layer on the elevated platform car to be on the same horizontal line, and controlling the top surface of the steel mesh on the same horizontal plane as the design elevation requirement. The present invention overcomes the traditional method of controlling the elevation of the steel mesh on the bridge deck based on the top surface of the bridge deck and easily affected by the change of prestress on the top surface of the bridge deck. The present invention uses the steel mesh protection layer elevated platform car to control the top surface of the steel mesh on the bridge deck pavement at the design elevation, which will not be affected by the change of prestress on the top surface of the bridge deck. The present invention can effectively control the thickness of the top protective layer of the steel mesh on the bridge deck pavement, and can effectively prevent cracking and deformation Collapse can significantly extend the service life of bridges.

Inventors

XU PENGFEI
Zhi Zhonglei
LIU TENGDA
WANG BINWU
ZHANG SHOUQIAN
HOU QI
WANG ZHIPENG

Assignees

中交一公局第一工程有限公司

Dates

Publication Date: 20260505
Application Date: 20240122

Claims (8)

1. The control method of the bridge deck pavement reinforcing steel mesh top surface protection layer is characterized by comprising the following steps of: (1) Preparing a reinforcement protection layer elevation trolley, a support base and a correction steel sheet; (2) Before paving the reinforcing steel meshes, cleaning the bridge deck; (3) Setting supporting bases at intervals along the roots of bridge deck guardrails at two sides, setting a channel steel with the length of 11-20 m on the upper end face of the supporting base at the same side, and setting correction steel sheets between the upper end of the supporting base and the lower end face of the channel steel to correct the upper end faces of the channel steel at two sides on the same horizontal plane, wherein the width of the channel steel is 20-30 cm; (4) Installing reinforcement protection layer elevation trolleys on two side edges of the upper end of the channel steel, respectively arranging idler wheels supporting the lower ends of the two sides of the truss of the operation trolley on the upper end edges of the channel steel on the two sides, manually moving the elevation trolleys back and forth to enable the elevation trolleys to operate along the upper ends of the channel steel on the two sides, and then hinged connecting the upper end edges of a plurality of baffle plates arranged at intervals with one side of the bottom edge of the truss of the trolley, wherein limit marker posts at the lower ends of the baffle plates are on the same straight line, and the lower ends of the same straight line of the limit marker posts are consistent with the design control height Cheng Biaogao of the top surface of the reinforcement mesh; (5) The method comprises the steps of paving a reinforcing mesh, paving the reinforcing mesh on the top surface of a bridge plate according to design requirements, and adjusting and controlling the top surface of the reinforcing mesh to be consistent with the design control height Cheng Biaogao according to each limit marker post, wherein the adjusting and controlling of the existing mounting support ribs and the adjusting and controlling of the embedded support ribs are included; (a) Setting out and marking each point of the support rib to be installed according to the design requirement on the top surface of a bridge plate at the lower end of a paved reinforcing steel bar net, arranging four support rib points distributed at intervals per square meter, manually moving a reinforcing steel bar protection layer elevation trolley to the space of the upper end of the reinforcing steel bar net at each point of the support rib to be installed transversely of the bridge plate, enabling the lower end surface of each limit marker post on the same straight line to be positioned on the same vertical plane with each point of the support rib to be installed transversely, fixing the elevation trolley, manually tilting the reinforcing steel bar net by using a crowbar, enabling the upper end surface of the reinforcing steel bar net to be aligned with the lower end surface of each limit marker post on the trolley in height alignment, abutting against the corresponding point of the support rib at the corresponding marked point of the support rib to be installed, and welding the upper ends of the support ribs with the corresponding lower ends of the reinforcing steel bar net, and welding the support ribs with different lengths according to different positions so as to ensure that the upper end surfaces of the reinforcing steel bar net are consistent with the design control height Cheng Biaogao, thereby ensuring that the thickness of the upper part of the reinforcing steel bar net is consistent when concrete protection layer is cast on the reinforcing steel bar net; When the transverse same-row adjustment control welding supporting ribs are finished, the upper end faces of the transverse reinforcing steel meshes are aligned with the lower end faces of the same straight line of each limit marker post in height, the elevation trolley is moved to the positions of the transverse to-be-installed supporting rib points of the adjacent rows, and the operation of repeatedly adjusting and controlling the welding supporting ribs is finished until the length section of the channel steel is adjusted and controlled to weld the supporting ribs; (b) Manually moving the reinforcement protection layer elevation trolley to the space of the upper end of the reinforcement mesh of the transverse embedded support rib of the bridge plate, enabling the lower end face of each limit marker post on the same straight line to be on the same vertical face with the transverse embedded support rib, fixing the elevation trolley, manually tilting the reinforcement mesh by using a crowbar, and when the upper end face of the reinforcement mesh is aligned with the lower end face of each limit marker post on the trolley in the same straight line, correcting and adjusting the aligned reinforcement mesh lower end embedded support rib by using a crowbar or a hammer, enabling the upper end of the corrected and adjusted aligned embedded support rib to be welded and fixed with the corresponding reinforcement mesh lower end, and welding and correcting and adjusting the embedded support rib according to different positions so as to ensure that the top face of the reinforcement mesh is consistent with the design control height Cheng Biaogao, thereby ensuring that the thickness of the reinforcement protection layer on the upper part of the reinforcement mesh is consistent and meeting design and specification requirements when concrete pouring is carried out on the reinforcement mesh in the subsequent step; After the pre-buried support bars are adjusted and controlled to be welded in the same row, the upper end face of the transverse reinforcement mesh is aligned with the lower end face of the same straight line of each limit marker post in height, the elevation trolley is moved to the position of each pre-buried support bar in the transverse direction of the adjacent row, and the operation of repeatedly adjusting and controlling the pre-buried support bars to be welded is repeated until the operation of adjusting and controlling the pre-buried support bars in the length section of the channel steel is finished; (6) Repeating the step (3) to lengthen the forward channel steel track, enabling the movable elevation trolley to move to a working section with the top surface of the adjacent adjustment control reinforcing steel mesh consistent with the design control height Cheng Biaogao, repeating the step (5), and adopting a circulating mode of detaching the forward channel steel track before repairing to advance the elevation trolley until the reinforcing steel mesh is paved; (7) Repairing the reinforced net piece removed from the support base part, so that the repaired reinforced net piece is consistent with the laying height of the reinforced net piece according to the design requirement.
2. The control method according to claim 1, wherein the method for controlling the height Cheng Biaogao of the top surface of the reinforcing mesh to be consistent with the lower end of the same straight line of each limit marker post is as follows: (a) Marking a top surface line of the protective concrete bridge deck to be constructed on the lower parts of bridge deck guardrails on two sides of the protective concrete bridge deck to be constructed by using a laser marking instrument according to the designed elevation requirements of the protective concrete bridge deck, and marking the top surface line by using chalk as a top surface control line of the pouring protective concrete bridge deck; (b) Subtracting the thickness of the designed protective layer on the top surface of the reinforcing steel bar net sheet from the lower end of the control line, marking the control line on the top surface of the reinforcing steel bar net sheet by using a red chalk, and verifying by using a laser marking instrument; (c) The lower ends of the limit targets on the elevation trolley for adjusting the reinforcement protection layer are on the same horizontal line, and are on the same horizontal plane with the control line for marking the top surface of the reinforcement mesh by using the red chalk.
3. The method of claim 1, wherein the adjusting the pre-embedded support bars at the lower end of the steel bar mesh by correcting and adjusting the crowbar or hammer comprises raising the pre-embedded support bars below the lower end of the steel bar mesh design control height Cheng Biaogao by the crowbar or hammering the pre-embedded support bars below the lower end of the steel bar mesh design control height Cheng Biaogao by the hammer.
4. The control method according to claim 1, wherein the existing mounting support bars are T-shaped, horizontal bars are fixed at the upper ends of the vertical bars, and the vertical bars are welded with the steel bar meshes through the horizontal bars.
5. The control method according to claim 1, wherein the repairing of the reinforcing steel bar meshes of the removed supporting base is performed by overlapping the corresponding reinforcing steel bar meshes adjacent to the periphery at the two ends of the repaired longitudinal and transverse reinforcing steel bars by 20cm, tightly winding the two reinforcing steel bars at the overlapping position by iron wires, overlapping the two reinforcing steel bars side by side, and arranging the reinforcing steel bar meshes at the repairing position and the reinforcing steel bar meshes adjacent to the periphery on the same plane.
6. The control method according to claim 1, wherein the reinforcement layer elevation trolley comprises a triangular truss, roller groups, baffle plates and limit standard bars, wherein the triangular truss at least spans the length between bridge deck guardrails at two sides, the triangular truss is formed by fixedly connecting three metal rods which are distributed in a triangular shape and are obliquely distributed with reinforcing rods at intervals, the metal rods are fixedly connected with each other through a plurality of reinforcing rods which are distributed in an inclined manner at intervals, roller groups for moving the triangular truss are respectively arranged at two sides of the bottom of the triangular truss, the upper end faces of the roller plates of the roller groups are respectively connected with two sides of the bottom of the triangular truss, the four corners of the lower end faces of the roller plates of the roller groups are respectively provided with a wheel seat, the rollers are connected with the wheel seat through shafts, the running direction of the rollers is perpendicular to the axis of the bottom of the triangular truss, the upper end edges of a plurality of baffle plates which are distributed at intervals are connected with one side of the bottom of the triangular truss through hinges, or the upper end edges of a plurality of baffle plates which are distributed at intervals are connected with one side of the bottom of the triangular truss through adjusting steel ropes, the limit standard bars are arranged at the lower end edges of each baffle plates, and the limit standard bars are arranged on the same straight line.
7. The control method according to claim 6, wherein the baffles have the same height, and through holes are formed in the same size positions of the baffles near the upper end edges of the baffles.
8. The control method according to claim 6, wherein the metal rod is an alloy aluminum rod or a steel tube rod.

Description

Control method and device for bridge deck pavement reinforcing steel mesh top surface protection layer Technical Field The invention belongs to a control method and a device for a protective layer on the top surface of a bridge deck pavement reinforcing steel bar net sheet. Background The bridge deck pavement is the last procedure of bridge engineering, the pavement of bridge deck pavement reinforcing steel bar net piece is the important link of bridge deck pavement, the bridge deck reinforcing steel bar net piece is a reinforcing steel bar net member for strengthening and protecting the concrete bridge deck, interweave by high strength reinforcing steel bar and form, the bridge deck pavement is that the reinforcing steel bar net piece is paved on bridge beam slab top surface earlier, then advance concrete pouring on the reinforcing steel bar net piece, make bridge deck reinforcing steel bar net piece be arranged in the concrete bridge deck of bridge deck pavement, form the protection concrete bridge deck of bridge deck pavement, the bearing capacity of reinforcing steel bar net piece mainly used reinforcing concrete bridge deck prevents that the bridge deck from cracking, warp and collapsing, improve the life of bridge. When the horizontal distance between the bridge deck reinforcing steel bar net piece in the bridge deck concrete and the upper end face of the bridge deck concrete meets the requirement and is horizontally distributed, namely the thickness of the protective layer (concrete) on the top face of the bridge deck pavement reinforcing steel bar net piece meets the requirement and is consistent, the bearing capacity of the concrete bridge deck can be enhanced, and the bridge deck cracking, deformation and collapse can be prevented. How to control the paved reinforcing mesh to ensure that the horizontal distance between the reinforcing mesh and the upper end surface of the bridge floor concrete in the bridge floor concrete meets the requirements and the reinforcing mesh is horizontally distributed is a technical problem of paving the reinforcing mesh. At present, a bridge deck reinforcing steel bar net piece is paved in a control elevation band mode, the elevation adopts 4 multiplied by 4cm angle steel, the angle steel is arranged at the 15cm position of the inner edge of the guardrail and the center line of the bridge deck, according to mileage control points, one point is measured every 5m, the elevation of the top surface of each bridge plate is measured, paving thickness is calculated, the paving thickness is intersected with angle steel installation workers, after angle steel installation, the elevation of each point angle steel is accurately measured, the angle steel wire between each point is leveled, one point elevation is detected every 2m, and the stability of the angle steel and the height difference of an angle steel joint are checked. The traditional elevation band control mode is based on the top surface of the bridge plate, but the top surface of the bridge plate is often influenced by the previous working procedures, so that the local elevation of the top surface of the bridge plate cannot meet the design requirements, particularly, a bridge is simply supported and then continuously supported, the middle part of the bridge plate is subjected to prestress influence, and elevation angle steel positioned on the top surface of the bridge plate is also influenced by the prestress. Therefore, the thickness of the protective layer at the top of the bridge deck pavement reinforcing steel bar net sheet can not be effectively controlled by only installing the supporting ribs or directly paving the reinforcing steel bar net sheet according to the control elevation belt mode design, and the bridge deck cracking, deformation and collapse can not be effectively prevented, so that the service life of the bridge is influenced. Disclosure of Invention The invention aims to design a control method and a device for a protective layer on the top surface of a reinforcing mesh for bridge deck pavement, and the top surface of the reinforcing mesh is controlled on a design elevation so as to overcome the defects of the traditional control method. Therefore, the control method of the bridge deck pavement reinforcing mesh top surface protection layer comprises the following steps: (1) Preparing a reinforcement protection layer elevation trolley, a supporting base and a correction steel sheet. (2) And cleaning the bridge deck before paving the reinforcing steel meshes. (3) Support bases are arranged along the roots of bridge deck guardrails on two sides at intervals, the upper end faces of the support bases on the same side are provided with a channel steel with the length of 11-20 m, the width of the channel steel is 20-30 cm, correction steel sheets are arranged between the upper ends of the support bases and the lower end faces of the channel steel, and the upper end faces of the channel steel on two sides