Widening processing structure of prefabricated channel steel of prefabricated erected simply-supported beam between tunnels and construction method thereof

A technology of simply supported beams and steel structures, which is applied in the erection/assembly of bridges, bridges, bridge construction, etc., which can solve the problems of long construction period for on-site pouring, difficulty in placing materials and construction machines and tools, etc., to simplify on-site construction procedures and shorten The effect of construction period and convenient construction

Inactive Publication Date: 2016-10-26
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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AI-Extracted Technical Summary

Problems solved by technology

[0002] At present, if the prefabricated box girder girder width of the bridge between tunnels cannot meet the requirements of the beam truck or the all-in-one machine for transportation and erection through the tunnel, the on-site pouring scheme is usually adopted
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Abstract

The invention relates to a widening processing structure of a prefabricated channel steel of a prefabricated erected simply-supported beam between tunnels and a construction method thereof. For a bridge between tunnels, if the width of a prefabricated box beam can not meet a transport erection requirement of going through a tunnel by a transporting girder vehicle or a transporting and erecting integration machine, a cast-in-place scheme is employed; however, because of frequent traffic congestion in tunnels and long distance, materials and construction machines can not be transported at a right place easily; and the cast-in-place construction period is long, the whole-line construction period can not controlled easily. According to the invention, a prefabricated channel steel component is arranged at an outer side of an end surface of a prefabricated box girder flange; and the prefabricated channel steel component has a channel steel structure, the notch faces outwardly, and the bottom is fixed at the prefabricated box girder by pre-buried bolts buried in the end surface of the prefabricated box girder flange in advance. Therefore, when the prefabricated beam width can not meet tunnel clear width and clearance requirements, tunnel passing time is less than the prefabricated beam width at the early stage and then the small part is complemented according to the designed beam width after post-stage erection completion. For bridges in tunnels, the field construction procedures can be simplified substantially and the construction period can be shortened effectively; and obvious economic benefits can be created.

Application Domain

Bridge erection/assembly

Technology Topic

Traffic congestionEngineering +5

Image

  • Widening processing structure of prefabricated channel steel of prefabricated erected simply-supported beam between tunnels and construction method thereof
  • Widening processing structure of prefabricated channel steel of prefabricated erected simply-supported beam between tunnels and construction method thereof
  • Widening processing structure of prefabricated channel steel of prefabricated erected simply-supported beam between tunnels and construction method thereof

Examples

  • Experimental program(1)

Example Embodiment

[0027] The present invention will be described in detail below in conjunction with specific embodiments.
[0028] The invention relates to a prefabricated and erected simple-supported beam prefabricated channel steel widening treatment structure between tunnels, which can be prefabricated in a beam yard and pre-assembled and sleeved. After splitting, the beam transporter or transport and erection integrated machine is used to transport and directly erect the sleeve. Connect and pour the post-cast-in-place vertical wall, etc. It can greatly simplify the on-site construction process and effectively shorten the construction period, which has obvious economic benefits.
[0029] The present invention makes the prefabricated box girder 1 transition from the original standard beam width of 12.6m to the prefabricated box girder beam width of 12.1m. The prefabricated channel steel member 2 is arranged outside the flange end surface of the prefabricated box beam 1, and the prefabricated channel steel member 2 is a channel steel structure , Can be prefabricated in sections, with a single section of 2.0m, the notch is outward, the bottom of the groove is fixed to the prefabricated box girder 1 by the embedded bolts 3 embedded in the flange end surface of the prefabricated box girder 1. The embedded bolts 3 are evenly distributed at an equal interval of 50cm At the flange end of the prefabricated box girder, the vertical direction is 2 in each row. The size of each section of prefabricated channel steel is "200cm×25cm×25cm", and 8 embedded bolts are arranged correspondingly. The rest of the reinforcement layout and box girder structure have not been modified.
[0030] Prefabricated box girder 1 flange end faces are provided with strip beam-end steel plates 7 at intervals of 250mm×80mm×5mm. The beam-end steel plates 7 are prefabricated with steel plate screw holes 8, and the beam-end steel plates 7 extend through the steel screw holes 8 The embedded bolts 3 are fixed to the flange end surface of the precast box girder 1 to ensure the flatness of the bonding surface. The groove bottom of the prefabricated channel steel member 2 is provided with a prefabricated channel steel member screw hole 6, and the position corresponds to the steel plate screw hole 8 of the beam end steel plate 7. The prefabricated channel steel member 2 passes through the prefabricated channel steel member screw hole 6 The buried bolt 3 is fixed on the flange end surface of the prefabricated box beam 1. The prefabricated channel steel member 2 is provided with vertical stiffening ribs 5 at intervals with a spacing of 50 cm, and the welding stiffening ribs 5 are arranged divergently from the bolt holes.
[0031] A prefabricated railing shutter or sound barrier 4 is arranged above the prefabricated channel steel member 2. The prefabricated railing shutter or sound barrier 4 covers the flange of the prefabricated box girder 1 and the prefabricated channel steel member 2, and the bottom of the outer side is provided with a downward protrusion to cover the prefabricated channel steel Component 2 notch.
[0032] During construction:
[0033] 1. The prefabricated box girder (beam width 12.10m) is prefabricated and maintained in the beam yard, and the connecting bolts are pre-embedded at the corresponding position of the flange plate end. The rest of the steel bar layout and structure are the same as the original standard drawing.
[0034] 2. The prefabricated channel steel components at the flange end of the box girder can be prefabricated separately at the same time as the prefabricated box girder.
[0035] 3. After the prefabrication maintenance is completed, the beam yard will be pre-assembled and sleeved. After the split, the beam truck or the integrated machine for transporting and erecting is used to set up the sleeve and pour the later vertical wall.
[0036] It includes the following steps:
[0037] Step 1: Prefabricated box beam 1:
[0038] Prefabricated box girder grouping, steel bars are placed and tied, and embedded bolts 3 are positioned; use the original standard beam template and pre-set wooden molds at the prefabricated channel steel components, pour box girder concrete and maintain it;
[0039] Step 2: Prefabricated channel steel component 2:
[0040] The prefabricated steel components are prefabricated with section steel plates according to the requirements of the design drawings, and bolt holes corresponding to the flange end faces of the prefabricated box girder 1 and the welding of the stiffening ribs are reserved according to the design;
[0041] Step one and step two can be performed simultaneously;
[0042] Step 3: Pre-assemble the prefabricated box girder 1 and the prefabricated channel steel member 2 through the embedded bolt 3 and adjust the error in the beam yard;
[0043] Step 4: After splitting, transport the prefabricated box girder 1 and the prefabricated channel steel member 2 together to the bridge location by using a beam transport vehicle or a combined machine;
[0044] Step 5: Erect the box girder with the bridge location. In order to ensure the connection to the flange end face of the box girder 1, the embedded steel plate 7 and the prefabricated channel steel member are made of 2mm post-epoxy resin glue and the prefabricated channel steel member is sleeved. Finally, the two are effectively connected by bolts.
[0045] This plan is not only suitable for the original standard beam width of 12.6m modified to 12.1m precast beam plan, it can be adjusted according to the size of the tunnel section and the standard beam width.
[0046] The content of the present invention is not limited to the enumerated examples, and any equivalent changes made by a person of ordinary skill in the art to the technical solution of the present invention by reading the description of the present invention are covered by the claims of the present invention.

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