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CN-121976467-A - Bridge deck formwork supporting structure and construction method thereof

CN121976467ACN 121976467 ACN121976467 ACN 121976467ACN-121976467-A

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a bridge deck formwork support structure and a construction method thereof. The bridge deck formwork support structure comprises a plurality of I-beams erected on bridge piers, wherein the I-beams form a combined beam, side support structures connected to the side beams are arranged on two sides of the combined beam in the horizontal direction, an inter-beam support structure and a dowel bar arranged on the lower side of the inter-beam support structure are arranged between two adjacent I-beams in the combined beam, the upper end of the side support structure is abutted to the bottom surface of an upper flange of the side beam, the lower end of the side support structure is abutted to the top surface of a lower flange of the side beam, two ends of the dowel bar are lapped on the lower flanges of the two adjacent I-beams and are respectively abutted to webs of the I-beams at two ends of the dowel bar, and the lower end of the inter-beam support structure is connected to the dowel bar. The distribution requirement of bridge construction load is met, the whole bridge deck slab supporting structure and the ground are arranged at intervals, and the space on the lower side of the combined beam is not occupied.

Inventors

  • Fan Aisen
  • MENG XIAOHONG
  • DAI LIWEN
  • FU MIN
  • GUO WENXIN

Assignees

  • 中国十九冶集团有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The bridge deck formwork support structure comprises I-beams (1) erected on bridge piers (90), wherein webs (11) of the I-beams (1) are perpendicular to a horizontal plane, the I-beams (1) are provided with a plurality of I-beams, the I-beams (1) are distributed along a horizontal direction perpendicular to the axial direction of the I-beams to form a combined beam, the bridge deck formwork support structure is characterized in that the I-beams (1) on two sides of the combined beam in the horizontal direction are side beams, side support structures (2) connected to the side beams are arranged on two sides of the combined beam in the horizontal direction, a beam-to-beam support structure (3) and a dowel bar (4) arranged on the lower side of the beam-to-beam support structure (3) are arranged between two I-beams (1) which are close to each other, and the dowel bar (4) is provided with a plurality of dowel bars (4) distributed along the length direction of the I-beams (1); The side support structure (2) and the inter-beam support structure (3) are all frame structures detachably connected with each other through rods, and the side support structure (2), the inter-beam support structure (3) and the dowel steel (4) are all positioned between an upper flange (12) and a lower flange (13) of the I-beam (1); The upper end of the side support structure (2) is abutted with the bottom surface of the upper flange (12) of the side beam, the lower end of the side support structure (2) is abutted with the top surface of the lower flange (13) of the side beam, two ends of the dowel bar (4) are lapped on the lower flanges (13) of the two I-beams (1) which are close to each other and are respectively abutted with webs (11) of the I-beams (1) at two ends of the dowel bar, and the lower end of the inter-beam support structure (3) is connected to the dowel bar (4).
  2. 2. The bridge deck form support structure according to claim 1, wherein said side support structure (2) comprises an inner rail (20) parallel to said I-beam (1), a column (21) connected to said inner rail (20), an upper rail (22) connected to the upper end of said column (21), a lower rail (23) connected to the lower end of said column (21), a diagonal brace (24) connecting said upper rail (22) and lower rail (23) and a diagonal brace (25) connecting said column (21) and said diagonal brace (24), said inner rail (20) being connected to a web (11) of said side rail, both ends of said column (21) being respectively abutted to the bottom surface of an upper flange (12) and to a lower flange (13) of said side rail, the axes of said upper rail (22) and lower rail (23) being arranged in a horizontal direction perpendicular to said inner rail (20), said diagonal brace (24) being arranged from said side rail inner side to said diagonal brace (22) and a diagonal brace (25) being arranged from said side rail inner side to said side rail outer side rail (26) and said diagonal brace (26) being arranged from said side rail outer side rail (26) to said side rail (27), the outer template stay bar (27) is fixedly connected to the upper side of the upper cross bar (22) and is parallel to the upper cross bar (22); The inner longitudinal rods (20), the upright posts (21), the upper cross rods (22), the lower cross rods (23), the diagonal rods (24), the diagonal rods (25), the outer longitudinal rods (26) and the outer template support rods (27) are all provided with a plurality of the inner longitudinal rods (20) which are axially distributed along the upright posts (21), the outer longitudinal rods (26) which are axially distributed along the diagonal rods (24), the upright posts (21), the upper cross rods (22), the lower cross rods (23), the diagonal rods (24) and the diagonal rods (25) which are axially distributed along the inner longitudinal rods (20), the upper cross rods (22), the lower cross rods (23) and the diagonal rods (25) are detachably and fixedly connected with the upright posts (21) through fasteners, and the upper cross rods (22), the lower cross rods (23), the diagonal rods (25) and the outer longitudinal rods (26) are detachably and fixedly connected with the diagonal rods (24) through fasteners.
  3. 3. The bridge deck formwork support structure according to claim 2, wherein a plurality of ear plates (6) fixedly mounted on a web plate (11) of the side sill are arranged on the outer side of the side sill, and the ear plates (6) are uniformly distributed along the axial direction of the inner longitudinal rod (20) and the axial direction of the upright post (21); the ear plate (6) is provided with a limiting through groove with an upward opening, the axis of the limiting through groove is parallel to the inner longitudinal rod (20), and the inner longitudinal rod (20) is clamped in the limiting through groove.
  4. 4. The bridge deck form support structure of claim 3, further comprising an additional upright (51) and an additional pull rod (52) disposed at the end of the bridge construction joint, wherein the additional upright (51) is fixedly connected with the side beam, and two ends of the additional pull rod (52) are respectively and tightly connected with the additional upright (51) and the diagonal brace (24).
  5. 5. The bridge deck form support structure according to any one of claims 3-4, characterized in that the inter-beam support structure (3) comprises inter-beam columns (31), inter-beam longitudinal bars (32) vertically connected with the inter-beam columns (31), inter-beam cross bars (33) simultaneously perpendicular to the inter-beam columns (31) and the inter-beam longitudinal bars (32), and inner side form braces (34) provided on top of the inter-beam columns (31), the lower ends of the inter-beam columns (31) being abutted against the top surface of the dowel bars (4), the inter-beam longitudinal bars (32) being parallel to the axis of the i-beam (1), the inner side form braces (34) being parallel to the inter-beam cross bars (33); The beam-to-beam vertical columns (31), beam-to-beam longitudinal rods (32), beam-to-beam transverse rods (33) and the inner side template supporting rods (34) are all provided with a plurality of beam-to-beam vertical columns (31) which are uniformly distributed along the axial direction of the beam-to-beam longitudinal rods (32) and the axial direction of the beam-to-beam transverse rods (33), the beam-to-beam longitudinal rods (32) which are uniformly distributed along the axial direction of the beam-to-beam vertical columns (31) and the axial direction of the beam-to-beam transverse rods (33), and the beam-to-beam transverse rods (33) and the inner side template supporting rods (34) which are uniformly distributed along the axial direction of the beam-to-beam longitudinal rods (32); Two ends of the beam-to-beam cross rod (33) are respectively abutted with the web (11) of the I-beam (1).
  6. 6. The bridge deck form support structure of claim 5 wherein one of the co-directional end faces of two adjacent inter-beam rails (33) abuts the web (11) of the i-beam (1).
  7. 7. The bridge deck form support structure of claim 6 wherein said inter-beam longitudinal bars (32) and said inter-beam transverse bars (33) are respectively secured to said inter-beam posts (31) by fasteners; The upper end of the inter-beam upright post (31) is provided with a threaded hole, a threaded rod (35) is connected with the threaded hole in a threaded mode, a U-shaped bracket (36) is fixedly connected to the upper end of the threaded rod (35), and the inner side template supporting rod (34) is located in a U-shaped clamping groove of the U-shaped bracket (36).
  8. 8. The bridge deck formwork support structure according to claim 7, wherein the dowel bar (4) is a rectangular steel pipe with a cross section, a plurality of positioning piles (41) are welded at the top of the dowel bar (4), and the positioning piles (41) are uniformly distributed along the axial direction of the dowel bar (4); the bottom surface of the beam-to-beam upright post (31) is provided with a positioning jack, and the positioning pile (41) is inserted into the positioning jack and is in clearance fit with the positioning jack.
  9. 9. The bridge deck form support structure of claim 8 further comprising a scaffold plate (7) disposed above said dowel bar (4), said scaffold plate (7) having a plurality of scaffold plates (7) uniformly distributed along an axial direction of said dowel bar (4).
  10. 10. The bridge deck form support structure construction method of claim 8 or 9, comprising the steps of: s1, construction preparation operation, including measuring paying-off, fixedly assembling the lug plate (6) on the outer side wall of a web plate (11) of the side beam according to design requirements, and welding a positioning pile (41) on the top surface of the dowel bar (4); S2, overlapping a plurality of dowel bars (4) on the upper sides of the lower flanges (13) of the two I-shaped beams (1) which are close to each other, wherein a separation pad is arranged between each dowel bar (4) and each lower flange (13); S3, installing an inter-beam upright post (31) on the dowel bar (4) and enabling a positioning pile (41) on the dowel bar (4) to be inserted into a positioning jack of the inter-beam upright post (31), and then installing an inter-beam longitudinal rod (32) and an inter-beam cross rod (33) to form an inter-beam supporting structure (3), wherein an isolation pad is arranged between the abutted web plate (11) and the end face of the inter-beam cross rod (33); s4, installing a first protective railing (93) at the top of the side beam, wherein the railing is installed on a row of shearing resistant pieces at the outer side of the side beam; S5, respectively embedding inner longitudinal rods (20) on two side beams into limit through grooves of the lug plates (6), sequentially assembling an upright post (21), an upper cross rod (22), an inclined strut (24), a lower cross rod (23), inclined struts (25) and outer longitudinal rods (26), sequentially assembling a plurality of outer longitudinal rods (26) from top to bottom, and finally assembling an outer template strut (27) to form a side support structure (2); s6, erecting a second safety protection railing (94) on the upper side of the support structure 2 outside the side beam, wherein the railing is arranged on the upper transverse rod at the edge and is connected with the large transverse rod at the bottom of the template dowel bar; And the step S3 and the step S4 are synchronously constructed.

Description

Bridge deck formwork supporting structure and construction method thereof Technical Field The invention belongs to the technical field of bridge construction, and particularly relates to a bridge deck formwork support structure and a construction method thereof. Background Deck boards are an important component of bridge superstructure that directly bear loads of vehicles, pedestrians, etc., and transfer these loads to piers and foundation structures through the beams below them. The bridge deck is generally a cast-in-situ reinforced concrete structure, and when the bridge deck is constructed, the bridge pier at the lower part and the beam above the bridge pier are constructed, and a bridge deck template supporting structure is erected below the precast bridge deck and paved on the supporting structure. The girder steel has the advantages of higher tensile strength, compression resistance, shear strength, toughness and the like, and most of girders on the lower side of the bridge deck are steel girders, wherein the I-shaped steel girders are most widely applied. At present, a formwork support structure adopted by bridge deck casting type construction generally adopts a full framing or beam column combined support scheme. When the full framing support structure is laid, firstly, the foundation below the bridge deck plate is subjected to replacement and hardening treatment, a bowl buckle type or fastener type steel pipe scaffold is erected, the positioning surface of the scaffold is adjusted to the casting structure shape of the bottom surface of various bridge deck plates according to the requirement, a jacking and internal supporting distribution beam is installed, and finally, a formwork is erected, and concrete is cast after binding reinforcing steel bars. When the beam column is laid and combined with the supporting structure, firstly, steel pipe piles or precast tubular pile foundations are inserted and driven on the foundation below the bridge deck slab, then, a bearing platform is poured, steel pipe columns, a connecting system, pile caps and column top distribution beams are installed, finally, a Bailey beam and a supporting frame are erected at the top to form the supporting structure, the distribution beams and the steel pipe scaffold are laid on the top surface of the Bailey beam, the top surface of the whole supporting structure is adjusted to be in the structural shape of the bottom surface of the bridge deck slab, finally, a mould is erected, and concrete is poured after steel bars are bound. In the above supporting structure, the full framing is convenient to disassemble and recover, but is only suitable for land and needs to harden the foundation, and once the foundation is a soft soil layer or water, the hardening cost is too high. The beam-column combined supporting structure is not limited by the foundation state, but piles and pile foundations are still required to be constructed on the foundation at the lower side of the bridge, but an original building or an infrastructure which exists before the bridge construction and needs to be protected can exist at the lower part of the bridge, so that the two supporting schemes are difficult to install a full framing at the lower side frame of the bridge deck. In order to save the problems, a part of construction sites are provided with the bailey beams above two main beams, the hanging frames are arranged on the lower side frames of the bailey beams, and the hanging frames are used for erecting the moulds, but the adopted bailey beams need to have enough strength, the weight of the bailey beams is high due to the increase of the steel consumption, the large-scale cranes are required for hoisting the bailey beams, but the construction spaces below part of the bridges and the side edges are insufficient, various large-scale equipment is difficult to erect, the construction space is required to be additionally expanded to ensure the field erection of large-scale machines, and the construction process is complex and the cost is high. Disclosure of Invention The invention aims to solve the technical problems of providing the bridge deck slab formwork support structure and the construction method thereof, so that the whole bridge deck slab formwork support structure is directly erected and connected on the upper side of a pier, the space on the lower side of a combined beam is not occupied, the number of large hoisting equipment and the occupied area thereof adopted in the bridge deck slab formwork support erection process are reduced, and the mechanical use cost is reduced. The bridge deck formwork support structure comprises an I-beam erected on a bridge pier, wherein a web plate of the I-beam is perpendicular to a horizontal plane, a plurality of I-beams are distributed along the horizontal direction perpendicular to the axial direction of the I-beam to form a combined beam, the I-beams on two sides of the combined beam in the horizontal direction