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CN-122013671-A - Bridge hogging moment searching device and method

CN122013671ACN 122013671 ACN122013671 ACN 122013671ACN-122013671-A

Abstract

The invention belongs to the technical field of bridge engineering construction, and provides a device and a method for searching a negative bending moment of a bridge. The device includes crossbeam, walking wheel, supporting component, vertical slip riser, elasticity tight subassembly and guide component, and elasticity tight subassembly in pushing up drives guide component self-adaptation laminating beam slab bottom, realizes accurate location through pushing down the resilience when going through stretch-draw pinion rack, and supporting component can realize that the device removes and location locking switches. The construction method comprises the steps of beam slab erection, wet joint construction, hogging moment stretching point searching, prestress stretching, system conversion and the like, and the positioned device can be used as a stretching alignment standard. The invention does not need personnel to enter a narrow space in high altitude for operation, reduces potential safety hazards, simplifies construction flow, and improves hogging moment stretching quality and construction efficiency.

Inventors

  • YAN XU
  • ZHAO HONGKUI
  • Pang Xiangqian
  • RAO WEI
  • WANG SHUAI
  • Chu Tingjin
  • ZHANG YI

Assignees

  • 山东高速路桥国际工程有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. A bridge hogging moment searching device, comprising: the walking wheel (2) is arranged at the bottom of the cross beam (1), the supporting component (3) is arranged at the outer side of the walking wheel (2), and the supporting component (3) can jack up the cross beam (1) upwards to separate the walking wheel (2) from the beam plate (8); The vertical plates (4) are arranged in two groups and are arranged on the cross beam (1) in parallel and vertically in a sliding manner, the bottoms of the vertical plates (4) penetrate through the lower part of the cross beam (1) and are connected with the guide assemblies (5), and the guide assemblies (5) can extend into the bottoms of the beam plates (8) and move along the bottoms of the beam plates (8); The elastic jacking component (6) is connected with the vertical plate (4) and can drive the vertical plate (4) to move upwards to enable the guide component (5) to be attached to the bottom of the beam plate (8) to move, and when the guide component (5) passes through the tensioning toothed plate (81) at the bottom of the beam plate (8), the guide component (5) can be driven to move along the arc-shaped end (811) of the tensioning toothed plate (81) and fall back to the vertical end (812) of the tensioning toothed plate (81) to achieve positioning.
  2. 2. The bridge hogging moment searching device according to claim 1 is characterized in that the elastic jacking component (6) comprises a guide rod (61) fixed on the cross beam (1), the top of the corresponding vertical plate (4) is connected with the cross beam (63), a sliding hole is formed in the cross beam (63), the guide rod (61) penetrates through the sliding hole to guide the cross beam (63), a jacking spring (62) is sleeved outside the guide rod (61), two ends of the jacking spring (62) are respectively connected with the bottom of the cross beam (63) and the cross beam (1), and the jacking spring (62) can drive the vertical plate (4) to move upwards.
  3. 3. A bridge hogging moment searching device according to claim 1 or 2, wherein the guiding component (5) comprises a connecting plate (51), the connecting plate (51) is connected to the bottom of the vertical plate (4), the bottom of the connecting plate (51) extends outwards to form a searching plate (53), and the searching plate (53) moves along the bottom of the beam plate (8) under the action of the elastic jacking component (6).
  4. 4. The device for searching the hogging moment of the bridge according to claim 3 is characterized in that the bottom of the vertical plate (4) is connected with an oblique sliding rail (41), the top of the corresponding connecting plate (51) is connected with a sliding block (52), and the sliding block (52) can slide in the sliding rail (41); The middle part of the cross beam (1) is also vertically and slidingly connected with an ejector rod (7), the bottom of the ejector rod (7) can slide to a position between the two connecting plates (51) to tightly support the connecting plates (51) so that the outer wall of each connecting plate (51) is propped against the corresponding baffle plate (43), a pull rope (73) is connected between the bottom of the ejector rod (7) and the connecting rods, and the ejector rod (7) is pulled upwards to drive the connecting rods to move oppositely so that the searching plate (53) is pulled out from the bottom of the beam plate (8).
  5. 5. The bridge hogging moment searching device according to claim 5 is characterized in that the upper portion of a push rod (7) is connected with a limiting plate (71), the limiting plate (71) can be clamped on a cross beam (1) to limit the push rod (7) to move downwards, the top of the push rod (7) is connected with a fixing rope (72), the top of a corresponding guide rod (61) is connected with a fixing frame (611), and the fixing rope (72) can be bound into the fixing frame (611) to fix the push rod (7).
  6. 6. A bridge hogging moment searching device according to claim 1 is characterized in that the supporting component (3) comprises an upper sleeve (31) and a lower sleeve (32) which can slide relatively, the upper sleeve (31) is fixed at the bottom of a cross beam (1), the bottom of the lower sleeve (32) is connected with a support seat (33), the support seat (33) is supported on the ground, a return spring (38) is connected between the upper sleeve (31) and the lower sleeve (32), the side face of the upper sleeve (31) is connected with a first supporting rod (34) in a rotating mode, the bottom of the lower sleeve (32) is connected with a second supporting rod (35) in a rotating mode, the first supporting rod (34) is hinged with the end portion of the second supporting rod (35) to form a connecting rod mechanism, when the first supporting rod (34) and the second supporting rod (35) are arranged in a straight line, the first sleeve and the second sleeve slide back, and the supporting component (3) is supported on a beam plate (8) in an extending mode.
  7. 7. The device for searching the hogging moment of the bridge according to claim 6, wherein the bottom of the second supporting rod (35) is connected with a lower pedal (36), the second supporting rod (35) can be driven to rotate by pressing the lower pedal (36) to realize supporting, the bottom of the first supporting rod (34) is connected with an upper push rod (37), and the upper push rod (37) is pushed to enable the first supporting rod (34) and the second supporting rod (35) to be separated from a locking state.
  8. 8. The bridge construction method is characterized by comprising the following steps of: S1, erecting beam plates (8), wherein bridge girder erection machines are symmetrically erected on temporary supports (33) and permanent supports (33) of bridge piers, the height of each temporary support (33) is higher than that of each permanent support (33) to enable the beam plates (8) to be in a simply supported stress state, and after the erection is completed, a plurality of beam plates (8) are arranged in parallel between two cover girders to form girder bodies (9), and wet joints (10) are formed between two adjacent girder bodies (9); S2, binding steel bars of the wet joint (10), binding longitudinal steel bars and transverse steel bars of the wet joint (10), penetrating tensioning steel bars between tensioning toothed plates (81) of two adjacent beam bodies (9), and sleeving a prestressed pipeline outside the position of the tensioning steel bars at the wet joint (10); s3, pouring concrete of the wet joint (10), pouring micro-expansion concrete with the same strength grade as the beam body (9), and covering geotextile for watering and curing after the concrete pouring is finished; S4, searching a tensioning point, namely searching the position of a tensioning toothed plate (81) by using the bridge hogging moment searching device according to any one of claims 1 to 7; S5, stretching the hogging moment, namely sleeving an anchor plate and an anchor clamping piece at the end part of the stretched steel bar in sequence, and then downwards placing a stretching device (11) under the beam plate (8) by attaching the searching device to stretch the hogging moment; s6, grouting the prestressed duct (82) on the tensioning toothed plate (81) and grouting the prestressed duct (82); S7, detaching the searching device, pressing down the vertical plate (4) to compress the jacking spring (62), lifting the ejector rod (7) upwards to separate the searching plate (53) from the bottom of the beam plate (8), and releasing the vertical plate (4) to release the searching device; S8, binding and pouring between the adjacent beam plates (8), and pouring after binding reinforcing steel bars between the adjacent beam plates (8) to form an integrated beam body (9); S9, system conversion, namely sequentially dismantling the temporary supports (33) in a symmetrical and synchronous dismantling mode, so that the beam body (9) is ensured to stably fall on the permanent supports (33), and conversion from a simply supported system to a continuous system is completed.
  9. 9. The bridge construction method according to claim 8, wherein the step S4 comprises the steps of: s4.1, placing the searching device between two beam plates (8), firstly, pulling up the ejector rod (7) to drive the connecting rod and the searching plate (53) to move oppositely, and then, lowering the searching device to enable the travelling wheel (2) to move along the beam plates (8), pressing down the vertical plate (4) to compress the jacking spring (62), lowering the searching plate (53) below the beam plates (8), loosening the ejector rod (7), loosening the vertical plate (4) after the searching plate (53) slides into the bottom of the beam plates (8), and propping the searching plate (53) against the bottom of the beam plates (8) under the action of the reset spring (38); s4.2, transversely moving and searching, namely pushing the cross beam (1) to move from one end to the other end of the wet joint (10) along the beam plate (8), gradually compacting the jacking spring (62) when passing through the arc-shaped end (811) of the tensioning toothed plate (81), gradually moving the vertical rod downwards, and rebounding when walking to the vertical end (812) of the tensioning toothed plate (81), wherein the vertical rod is a tensioning point; And S4.3, starting the supporting component (3) to support the device on the beam plate (8) so as to separate the travelling wheel (2) from the beam plate (8) and realize the positioning of the device.
  10. 10. The bridge construction method of claim 8, wherein the tensioning device (11) comprises a bottom plate (111), tensioning jacks (112) are transversely connected to the bottom plate (111) in a sliding mode, limiting columns (113) are connected to two ends of the bottom plate (111) and used for preventing the tensioning jacks (112) from sliding out, fixing plates (114) are further connected to two sides of the bottom plate (111), a U-shaped locating plate (115) is connected to one fixing plate (114), the U-shaped locating plate (115) can be clamped on a connecting rod and vertically moves along the connecting rod, lifting ropes (116) are connected to the two fixing plates (114), and the lifting machine (117) is connected with the lifting ropes (116) to lift the device so that the limiting columns (113) are propped against the bottom of the beam plate (8) to achieve integral stability of the device.

Description

Bridge hogging moment searching device and method Technical Field The invention belongs to the technical field of bridge engineering construction, and particularly relates to a device and a method for searching a negative bending moment of a bridge. Background The simply supported-to-continuous beam bridge is the most widely applied structural form in the existing prefabricated bridge engineering, as shown in figures 5 and 6, has the dual advantages of convenient construction of the simply supported beam, high prefabricated standardization degree, excellent integral stress performance of the continuous beam, good travelling smoothness and strong structural durability, and the construction logic is as follows: firstly, erecting a precast beam slab on a temporary support and a permanent support of a bridge pier according to a simply supported state, after binding wet joint steel bars and pouring concrete, converting the multi-span simply supported beam slab into an integral continuous stressed structure through a pier top hogging moment prestress tensioning procedure, and finally dismantling the temporary support to complete system conversion, so that uniform transmission and stress optimization of the integral load of the bridge are realized. The negative bending moment tensioning toothed plate at the bottom of the pier top beam plate is used as a core stress node of prestress tensioning, and positioning is a key precondition for guaranteeing that prestress tensioning is in place, avoiding stress unbalanced load of a structure and guaranteeing system conversion quality, and the integral bearing capacity and service life of the bridge are directly influenced. At present, the bridge hogging moment stretch-draw pinion rack location adopts traditional modes such as manual investigation, simple and easy instrument assistance-localization real-time, has following shortcoming: 1. The hogging moment tensioning toothed plate is positioned below a wet joint at the bottom of the beam plate, the operation space is narrow, the sight permeability is poor, a constructor is required to bend down and even enter a high-altitude narrow space to touch and explore by bare hands in the traditional manual positioning, the labor intensity is extremely high, the operation time is long, safety accidents such as high-altitude falling and collision scratch are extremely easy to occur, the position of the toothed plate is judged by the experience of the constructor without a feedback mechanism in the manual exploration, the problems such as positioning deviation and missing inspection are extremely easy to occur, the subsequent prestress tensioning is directly caused to be inaccurate, the quality hidden troubles such as stress unbalance loading, insufficient prestress tensioning and the like of the beam plate are caused, and the durability of a bridge structure is influenced. 2. The part auxiliary positioning tool can only realize simple transverse movement, cannot be attached to the curved surface of the bottom of the beam plate and the arc transition section of the toothed plate in a self-adaptive manner, cannot accurately identify and form obvious positioning feedback when the toothed plate is stretched, cannot form obvious positioning marks, and easily causes the problem of missed detection. 3. After the positioning is finished, no fixed alignment reference exists, the alignment still needs to be adjusted for the second time when the tensioning device is lowered, and the prestress steel bars and the toothed plates are easy to collide in the repeated debugging process, so that the construction efficiency is reduced, and the prestress system is possibly damaged. Disclosure of Invention In order to solve the problems in the prior art, a device and a method for searching the hogging moment of the bridge are provided. The technical scheme includes that the bridge hogging moment searching device comprises a cross beam, travelling wheels are arranged at the bottom of the cross beam and transversely arranged between two beam plates, supporting components are arranged on the outer sides of the travelling wheels and can jack up the cross beam upwards to separate the travelling wheels from the beam plates, two groups of vertical plates are arranged on the cross beam in a parallel and vertical sliding mode, the bottoms of the vertical plates penetrate through the lower portion of the cross beam and are connected with guide components, the guide components can extend into the bottoms of the beam plates and move along the bottoms of the beam plates, elastic jacking components are connected with the vertical plates and can drive the vertical plates to move upwards to enable the guide components to be attached to the bottoms of the beam plates, and when the bridge hogging teeth pass through tensioning tooth plates at the bottoms of the beam plates, the guide components can be driven to move along arc ends of the tensioning tooth plates and fall bac