CN-121976465-A - Prefabrication-slippage installation construction method for pier side of precast beam under limited condition of transportation frame

CN121976465ACN 121976465 ACN121976465 ACN 121976465ACN-121976465-A

Abstract

The invention relates to the technical field of bridge engineering, in particular to a prefabrication-slippage installation construction method beside a precast beam pier under the condition of limited transportation frame, which comprises the following steps of selecting a steel platform erection position according to the environmental condition of a precast beam bridge to be built, wherein a prefabricated pedestal of a standardized beam piece is arranged at the top of the steel platform; the method comprises the steps of finishing beam prefabrication by using a steel platform as a construction platform, setting a synchronous hydraulic jacking system and paving a sliding rail, synchronously jacking the beam, manually dismantling a prefabricated beam sheet pedestal, synchronously landing the beam after installing an integrated sliding trolley, additionally arranging a sliding safety device in the sliding opposite direction of the beam, setting a safety control distance between the integrated sliding trolley and a sensing stop in advance, starting the integrated sliding trolley, sliding the supporting beam body to a designated installation position, locking the integrated sliding trolley, and synchronously jacking the beam sheet by installing the synchronous hydraulic jacking system to finish beam sheet installation. The construction method solves the problems of high rigidity requirement on the steel platform, low sliding work efficiency, unsmooth track connection, poor working procedure cooperativity and the like in the pushing construction in the prior art.

Inventors

CHENG DUOYUN
CHEN HUANHUAN
LIU SAI
CHEN DONGFENG
WANG YUANXIN
LIN RONGTONG
LV SHILIN
WU XINGFA
XIAO MENG
XUE CHAO
TANG LI
ZHU JUNSHAN
LIN XIAOYU
WANG HAIXIA
XIE MENGQI

Assignees

中交二航局(福州)建设有限公司

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (10)

1. The prefabrication-sliding installation construction method for the pier side of the precast beam under the condition of limited transportation frame is characterized by comprising the following steps of: 1) Selecting a steel platform erection position (for example, the right side of an erected bridge is close to an existing high-voltage line, namely, the left side area of the bridge is selected to be erected) according to the environmental condition of a precast beam bridge to be built, and arranging a partially-manufactured beam piece precast pedestal at the top of the steel platform; 2) Prefabricating a beam sheet on site, namely conveying and lifting steel bars and templates by using a truck crane as a construction platform, installing an outer mold by adopting a movable steel template, and manually closing the mold; 3) The synchronous jacking system and the sliding rail are installed, wherein the bottom of the beam body is provided with 4 sets of synchronous hydraulic jacking systems, the sliding rail is paved along the sliding path of the beam body, and sleepers are paved at intervals at the bottom of the sliding rail to support the sliding rail, so that the sliding rail is smooth; 4) The integrated sliding trolley is installed and falls, namely the beam body is synchronously lifted, the prefabricated pedestal of the part of the beam piece is manually removed, and the beam is synchronously fallen after the integrated sliding trolley is installed; 5) The beam sheet sliding, namely after each preparation work is in place, setting the safety control distance between the integrated sliding trolley and the sensing stop in advance by measuring the installation position of the lofting beam sheet, starting the integrated sliding trolley, enabling the bolster body to slide to the appointed installation position at a constant speed, and automatically decelerating, braking and locking the integrated sliding trolley when the integrated sliding trolley quickly reaches the safety control distance between the integrated sliding trolley and the sensing stop; 6) And (3) jacking the falling beam, finishing the installation, namely installing the synchronous hydraulic jacking system again, synchronously jacking the beam sheet, dismantling the integrated sliding trolley, installing the temporary support, arranging adjustable diagonal braces on two sides of the prefabricated beam, dismantling the sliding safety device, and finishing the installation of the beam sheet.
2. The prefabrication-slippage installation construction method for the pier side of the precast beam under the condition of limited transportation frame according to claim 1, wherein the steel platform comprises a plurality of steel pipe piles arranged on one side of a bridge, a main beam is fixedly welded on a pile top plate of the steel pipe piles, a plurality of groups of bailey beam groups are fixedly arranged at the upper end of the main beam, two adjacent bailey beams Lei Liangzu are connected into a whole through a steel diagonal brace, a distribution beam and a pattern steel plate are sequentially paved above the bailey beam groups to form a precast beam construction platform, and the prefabricated beam sheet prefabrication pedestal is arranged on the precast beam construction platform.
3. The prefabrication-sliding installation construction method for the pier side of the precast beam under the condition of limited transportation frame according to claim 2, wherein the Bailey beam group is formed by connecting Bailey beams through flower frames, and the lower chord of the Bailey beam is anchored with a main beam by adopting a buckle.
4. A method of prefabricating and sliding a girder pier side under a limited transportation frame according to claim 1, 2 or 3, wherein the prefabricated abutment of the prefabricated girder sheet is composed of i-steel and steel panels and can be integrally disassembled in sections.
5. A method of prefabricating-sliding mounting of a precast beam pier in a limited condition of a carrier as claimed in claim 1,2 or 3, wherein the synchronous hydraulic jacking system comprises a jack, a displacement sensor, a synchronous control box and a pressure monitoring module.
6. The method for prefabricating-sliding installation of the precast beam pier side under the limit condition of the transportation frame according to claim 5, wherein the sliding rail is in a U-shaped groove form and is matched with the height of the integrated sliding trolley.
7. The method for prefabricating-sliding installation of the precast beam pier side under the condition that a transportation frame is limited according to claim 1, 2, 3 or 6, wherein the integrated sliding trolley comprises a sliding trolley with a brake roller arranged at the bottom, the sliding trolley is provided with an independent driving device, a brake device and a guide mechanism, a bearing panel is arranged on the top surface of the sliding trolley through a pressure sensor, and a wireless synchronous receiver and a displacement sensor are also arranged on the top surface of the sliding trolley.
8. The prefabrication-sliding installation construction method for the pier side of the precast beam under the condition of limited transportation frame is characterized in that a variable frequency motor is adopted as an independent driving device to be matched with a planetary reducer, an electromagnetic disc brake is adopted as a braking device, two sides of a sliding rail are provided with baffle plates to form a rail clamping groove, and the guiding mechanism is formed by matching an elastic lateral guide wheel arranged on the side face of the sliding trolley with the rail clamping groove.
9. The construction method for prefabricating-sliding installation of the pier side of the precast beam under the condition that a transportation frame is limited according to claim 1 or 8, wherein the sliding safety device consists of a slow winch with a electromagnetic brake, an anti-torsion steel wire rope, a tension sensor, a guide pulley block and a linkage control module.
10. The method for prefabricating-sliding installation of the pier side of the precast beam under the condition of limited transportation frame according to claim 1, wherein the temporary support is formed by an unloading sand box.

Description

Prefabrication-slippage installation construction method for pier side of precast beam under limited condition of transportation frame Technical Field The invention relates to the technical field of bridge engineering, in particular to a prefabrication-slippage installation construction method beside a prefabrication beam pier under the condition of limited transportation frame. Background The main stream mode of traditional precast beam bridge construction is to finish precast beam production in a beam field far away from a bridge position in a concentrated manner, transport a beam body to a pier position through a special beam transporting vehicle, and then hoist and mount the precast beam in place by using a bridge girder erection machine. Aiming at mountain bridge projects inconvenient to transport, bridge head roadbed sections can be transformed into temporary prefabricated fields, and bridge girder erection machines or automobile cranes are used for erecting bridge girders one by one after the site prefabrication of girder segments is completed. The process for centralized prefabrication of the prefabricated beams, transportation of the beam transporting vehicle and installation of the bridge girder erection machine is mature, but the transportation difficulty of the prefabricated beams is increased under the conditions of steep slopes in mountain areas, small-radius temporary roads and the like, and particularly, the transportation risk is extremely high for large-span prefabricated beams. Meanwhile, the precast beam bridge which is partially positioned under the mountain area condition has limited usable sites and does not have the assembly construction conditions of a small-sized beam site and a bridge girder erection machine, and the precast beam bridge which is partially positioned under the high-voltage line and cannot be changed by the line cannot be used by bridge girder erection machines, large-sized automobile cranes and other girder erection equipment. For the condition that the precast beam is difficult to transport and erect and even the bridge girder erection machine cannot be used for installing the girder segments, researchers propose and apply a bridge girder erection bailey platform beside a pier to perform on-site precast beam, and the process of transversely sliding and installing the precast beam at the pier top can effectively solve the problems in the part by adopting a mode of pushing a jack and combining a tetrafluoro slide plate or a winch traction mode. The process for pushing the tetrafluoro slide plate by the jack and the precast beam sheet of the steel pipe platform is required to be arranged on the steel platform, the stability of the platform is greatly influenced, meanwhile, the transverse pushing device is clamped and positioned by adopting a motor screw rod, the structure is heavy and is only suitable for short-distance sliding, long-distance pushing from the pier side to the capping beam cannot be adapted, the Bei Leiping platforms and the pushing track are designed in a split mode, step differences are easily generated at the joint, the stress concentration of the slide plate and the beam body is caused, the pushing process is controlled manually by a single group of jacks, the synchronization precision is poor, and the beam body deflection is easily caused. The adoption of a winch traction and sliding mode easily causes the transverse deviation of the beam body due to uneven tension, causes the problems of track clamping or stress concentration of the beam body and the like, and meanwhile, the winch traction direction is single, the speed is difficult to control, and the safety risk is high. Disclosure of Invention The invention aims to provide a prefabrication-sliding installation construction method for a prefabrication beam pier side under the condition of limited transportation frame, and the construction method solves the problems of high rigidity requirement, low sliding work efficiency, unsmooth track connection, poor working procedure cooperativity and the like of a steel platform in pushing construction in the prior art. The technical scheme of the invention is that the prefabrication-sliding installation construction method for the pier side of the precast beam under the condition of limited transportation frame comprises the following steps: 1) Selecting a steel platform erection position according to the environmental conditions of a precast beam bridge to be built, wherein a prefabricated beam piece prefabrication pedestal is arranged at the top of the steel platform; 2) Prefabricating beam plates on site, namely transporting and hoisting steel bars and templates by using a truck crane as a construction platform, and installing an outer mold by adopting a movable steel template and manually closing the mold; 3) The synchronous jacking system and the sliding rail are installed, wherein the bottom of the beam body is provided with 4 sets of synchronous