CN-122013670-A - Overhead intersection variable-width section girder erection construction method

CN122013670ACN 122013670 ACN122013670 ACN 122013670ACN-122013670-A

Abstract

The invention relates to a construction method of a girder erection machine for an elevated junction widening section, which comprises the following steps of installing a bridge girder erection machine on a prefabricated small box girder erected on an elevated main line, placing a tail support leg of the bridge girder erection machine on the prefabricated small box girder, placing a front support leg of the bridge girder erection machine on a first bent cap, adjusting the position of a middle support leg and placing the middle support leg on the prefabricated small box girder, moving forward the girder erection machine, placing a front temporary support leg on a second long bent cap, folding the front support leg, beginning to punch, finishing the punching, placing a lifting device on the first long bent cap, moving the whole girder erection machine to a junction widening section of the cast-in-situ box Liang Zadao and the prefabricated small box girder of the main line through the middle support leg and the front support leg, lifting the pre-erection small box girder on a rear crane and the front crane through a steel wire rope, greatly improving the construction efficiency, saving the construction process and accelerating the junction widening section.

Inventors

LIAO JIJUN
LI DAWANG
SUN JIE
CHEN ZHIGANG
Lou Lvbing
XIAO LI
XU ZHENDONG
CAI JIAN
WU YABO
Tong Xiangping

Assignees

浙江新湾市政工程建设有限公司
宁波市政工程建设集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260311

Claims (9)

1. The construction method of the overhead intersection widening section girder erection is characterized by comprising the following steps of: s1, installing a bridge girder erection machine on a prefabricated small box girder erected on an overhead main line along the length direction of an overhead; s2, placing the tail support leg of the bridge girder erection machine on the erected prefabricated small box girder, placing the front support leg of the bridge girder erection machine on the first long capping girder, suspending the front temporary support leg, adjusting the position of the middle support leg, moving forward to the position of about 5m at the front end of the erected prefabricated small box girder and placing the front temporary support leg on the prefabricated small box girder; S3, moving the truss girder on the bridge girder erection machine forwards, and placing the front temporary supporting leg on the second long bent cap; S4, folding the front supporting leg, starting to wash down, and suspending the front supporting leg between the first long bent cap and the second long bent cap; S5, finishing the punching, placing a heightening device on the side edge of the prefabricated small box girder on the first long bent cap, S6, adjusting the height of the heightening device, enabling the height of the heightening device to be level with the height of the prefabricated small box girder, and extending a guide rail which moves in a matched mode with the middle supporting leg and placing the guide rail on the heightening device; S7, moving the truss girder on the bridge girder erection machine forwards, moving the rear crane and the front crane forwards, and moving the whole bridge girder erection machine to a cross widening section of the cast-in-situ box Liang Zadao and the main line prefabricated small box girder through the middle supporting leg and the front supporting leg; S8, hoisting pre-erected small box girders on the rear crane crown block and the front crane crown block through steel wire ropes, and placing the pre-erected small box girders on a junction widening section between the first long bent cap and the second long bent cap; S9, pouring the cast-in-situ box girder again between the first long bent cap and the third long bent cap, wherein the cast-in-situ box girder is flush with the ramp of the poured cast-in-situ box girder and the laid plurality of pre-erected small box girders.
2. The construction method of the elevated cross widening section girder according to claim 1, wherein in the step S5, a plurality of heightening devices are arranged and are sequentially arranged at equal intervals along the length direction of the first long bent cap, and one side surface between the heightening devices is flush with the end surface of the prefabricated small box girder in the length direction.
3. The construction method of the overhead intersection widening section girder erection according to claim 1, wherein in the step S8, the whole girder erection machine sequentially shelves the pre-erected small box girders along the length direction of the first long bent cap and the second long bent cap in the intersection widening section, and the whole girder erection machine sequentially moves along the shelf direction until the shelf small box girders are equal in width to the poured cast-in-situ box girder ramp.
4. The construction method of the overhead intersection widening section girder according to claim 1, wherein the heightening device comprises a bottom sealing cylinder and a supporting cylinder, the lower end part of the supporting cylinder is provided with a supporting plate, the supporting plate is sleeved on the inner wall of the bottom sealing cylinder and can slide up and down, fine sand is filled in a cavity between the bottom sealing cylinder and the supporting plate, a bearing component is arranged between the upper end part of the supporting cylinder and the lower end part of the bottom sealing cylinder and is fixed through a connecting component, the bottom of the side wall of the bottom sealing cylinder is provided with a sand outlet component which is convenient for discharging the fine sand, and the sand outlet component is obliquely arranged downwards along the height direction of the bottom sealing cylinder.
5. The method for constructing an overhead intersection widening section girder according to claim 4, wherein the sand outlet assembly comprises a sand outlet pipe and a sealing cap nut, one end of the sand outlet pipe is fixed and communicated with a through hole formed in the bottom of the side wall of the bottom sealing cylinder, the other end of the sand outlet pipe is provided with external threads and is screwed and fixed with the sealing cap nut, and the sand outlet pipe is obliquely arranged downwards along the height direction of the bottom sealing cylinder.
6. The method of claim 4, wherein the bearing assembly comprises a top cover plate and a bottom support plate, the top cover plate is fixed on the upper end of the support cylinder, the bottom support plate is fixed on the lower end of the bottom sealing cylinder, and the top cover plate and the bottom support plate are rectangular and have the same area.
7. The method of constructing an overhead intersection widening section girder according to claim 6, wherein the connecting assembly comprises four screws and bolts, the screws are inserted into the top cover plate from the bottom support plate, and the bolts and the screws are screwed and fixed on the top cover plate.
8. The method of constructing an overhead intersection widening section girder according to claim 7, wherein the bottom support plate is provided with a countersink, a screw head of the screw is embedded in the countersink, and the bottom of the screw head is flush with the bottom surface of the bottom support plate.
9. The construction method of the elevated cross widening section girder erection machine of claim 6, wherein the connecting components are located at four end corners of the top cover plate and the bottom support plate, and the distance between adjacent screw rods is larger than the width of the guide rail of the girder erection machine.

Description

Overhead intersection variable-width section girder erection construction method Technical Field The invention belongs to the technical field of construction engineering bridge box girder erection construction, and particularly relates to an overhead intersection widening section girder erection construction method. Background In the construction process of the viaduct, the ramp of the overhead cast-in-situ box girder and the prefabricated small box girder of the main line meet the width-changing section, in the existing construction method, the prefabricated small box girder of the main line is hoisted through a bridge girder erection machine, then the construction of the ramp of the overhead cast-in-situ box girder and the prefabricated small box girder of the main line meet the width-changing section is processed, in the processing process, the ramp is poured at present, then the small box girder with equal height and equal length with the prefabricated small box girder of the main line meet the width-changing section is erected, and in the erection process, a crane mode and the like are adopted, so that the construction period is greatly prolonged, and the construction progress is influenced; The bridge girder erection method is characterized in that the bridge girder erection method is used by a company, the bridge girder erection method is constructed through a bridge girder erection machine and a small box girder of a prefabricated small box girder of a main line, the bridge girder erection machine can be used for realizing the small box girder erection of the bridge girder erection machine only by arranging a middle supporting leg heightening device on a cover girder in the construction process, and the following method is generally used for solving the problem of arranging the middle supporting leg heightening device: 1. the sand bag and sleeper stacking method includes stacking sand bags below the support points or setting up sleeper stacks as the raising foundation. The method has the obvious defects of poor stability, unstable support caused by compression sedimentation, uneven stress, potential safety hazard, low construction efficiency, large material loss and difficulty in accurately controlling elevation. 2. The simple steel welding method is to cut and weld the steel with H-shaped steel to form the temporary support frame. The method has the advantages that although the strength is improved, the risk of on-site fire operation exists, the construction period is long, the supporting structure is disposable, the universality is poor, and the waste of materials and manpower is caused. 3. Customizing special support leg method, namely customizing lengthened or specially structured middle support leg for specific project. The method is high in cost and poor in economy, and a set of special supporting legs cannot be suitable for bridges with different spans or different widening slopes, so that the universality and the flexibility are not enough. Therefore, the prior art lacks a quick, safe, adjustable, reusable and economical medium leg raising solution. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide the overhead intersection widening section girder erection method which is high in construction efficiency and convenient to construct. The invention aims to accomplish the following technical scheme, and the construction method of the overhead intersection widening section girder comprises the following steps: s1, installing a bridge girder erection machine on a prefabricated small box girder erected on an overhead main line along the length direction of an overhead; S2, placing the tail support leg of the bridge girder erection machine on the erected prefabricated small box girder, placing the front support leg of the bridge girder erection machine on the first cover girder, suspending the front temporary support leg, adjusting the position of the middle support leg, moving forward to the position of about 5m at the front end of the erected prefabricated small box girder and placing the front temporary support leg on the prefabricated small box girder; S3, moving the truss girder on the bridge girder erection machine forwards, and placing the front temporary supporting leg on the second long bent cap; S4, folding the front supporting leg, starting to wash down, and suspending the front supporting leg between the first long bent cap and the second long bent cap; S5, finishing the punching, placing a heightening device on the side edge of the prefabricated small box girder on the first long bent cap, S6, adjusting the height of the heightening device, enabling the height of the heightening device to be level with the height of the prefabricated small box girder, and extending a guide rail which moves in a matched mode with the middle supporting leg and placing the guide rail on the heightening device; S7, moving the truss girder on the bridge girder er