CN110804943A - On-site construction method for urban assembled vase pier steel reinforcement framework - Google Patents

On-site construction method for urban assembled vase pier steel reinforcement framework Download PDF

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Publication number
CN110804943A
CN110804943A CN201911155373.5A CN201911155373A CN110804943A CN 110804943 A CN110804943 A CN 110804943A CN 201911155373 A CN201911155373 A CN 201911155373A CN 110804943 A CN110804943 A CN 110804943A
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China
Prior art keywords
framework
steel reinforcement
steel
main
pier
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Pending
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CN201911155373.5A
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Chinese (zh)
Inventor
王二兵
杜西江
王萌
陈兵
张志厅
郝桢
陆均
张宗圣
沈强儒
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Jiangsu Xu Chen Transportation Technology Development Co Ltd
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Jiangsu Xu Chen Transportation Technology Development Co Ltd
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Priority to CN201911155373.5A priority Critical patent/CN110804943A/en
Publication of CN110804943A publication Critical patent/CN110804943A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The invention discloses a site construction method for a steel bar framework of an urban fabricated vase pier, which comprises the following steps: preparing earlier stage, bed-jig installation, cushion cap framework of steel reinforcement is prefabricated, and pier shaft framework of steel reinforcement is prefabricated, and framework of steel reinforcement hoist and mount, cushion cap framework of steel reinforcement are pre-buried, pier shaft framework of steel reinforcement butt joint installation. The invention provides a site construction method of a steel bar framework of an urban assembly type vase pier, which realizes that a pier body is constructed to a workshop and is changed from high altitude to flat ground, greatly improves the construction operation environment of workers and site management personnel, reduces the labor intensity, improves the working efficiency, reduces the use of resources such as mechanical equipment and the like, and effectively ensures the processing precision.

Description

On-site construction method for urban assembled vase pier steel reinforcement framework
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a site construction method of a steel bar framework of an urban fabricated vase pier.
Background
With the construction of a batch of domestic large-scale bridge engineering projects with world influence, the bridge construction level in China reaches a new historical height. A large amount of auxiliary materials and hoisting equipment are required to be input in the traditional pier body construction operation mode, construction operation is greatly influenced by the environment, the operation environment of workers is poor, the work efficiency is greatly reduced, the effective operation time is limited, the safety risk is increased in multiples, and the construction quality is not easy to control. Particularly, some urban viaducts generally adopt a structure of a large-span box girder and a double-column vase pier, the structure is smooth in appearance and good in integrity, but the cross section of the double-column vase pier in the prior art is basically small in the lower section, the upper section is unfolded outwards along a transverse bridge and is in a vase shape, the cross section of the upper section is complex, the arrangement of reinforcing steel bars is correspondingly complex, and the construction adopts a cast-in-place method, so that the construction time is long, the construction difficulty is high, and the difficulty is brought to the construction precision of a pier reinforcement framework. The bridge piers are in a single-pile form, and have no bearing platform structure, so that the field erection of the support is difficult; the bridge position has severe climatic environment, strong monsoon in winter and more days, and typhoon exists in summer; in conclusion, the pier body steel reinforcement framework in the prior art has the problems of high construction difficulty, difficulty in ensuring precision, low work efficiency and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a site construction method of a steel bar framework of an urban fabricated vase pier, which realizes that a pier body is constructed to a workshop and is changed from high altitude to flat ground, greatly improves the construction operation environment of workers and site managers, reduces the labor intensity, improves the work efficiency, reduces the use of resources such as mechanical equipment and the like, and effectively ensures the processing precision.
In order to achieve the purpose, the invention provides the following technical scheme: an on-site construction method for a steel reinforcement framework of an urban fabricated vase pier comprises the following steps:
a. early preparation: designing a jig frame according to a pier body reinforcement framework structure, wherein the jig frame is formed by detachably combining a plurality of steel plates, channel steel and angle steel, and a plurality of main reinforcement positioning notches are finely machined in the jig frame;
b. mounting a jig frame: assembling the processed jig frame components through connecting pins to form a jig frame, and arranging a plurality of jig frames at intervals to form a production line, wherein the distance between the jig frames is 2.5-3 m;
c. prefabricating a bearing platform steel reinforcement framework: prefabricating a bearing platform steel reinforcement framework by using a jig frame, arranging a sealing end bracket at the bottom of the steel reinforcement framework after prefabrication is finished, and arranging a plurality of lifting lugs at the top of the steel reinforcement framework;
d. prefabricating a pier body steel reinforcement framework: synchronously processing a plurality of sections of pier body steel reinforcement frameworks by utilizing a jig frame growth line, connecting main reinforcements by adopting rolling straight thread sleeves during prefabrication, adopting standard wires at one end of each main reinforcement, adopting a long wire at the other end, welding stirrups on the main reinforcements at intervals, wherein the installation density of the stirrups on the middle third section of the main reinforcements is 1.5-2 times that of the two ends, simultaneously not installing the stirrups and drag hooks in 50-55 cm ranges above and below a connector, and selecting one main reinforcement with the same groove in each section of steel reinforcement framework to mark as a positioning reinforcement before taking off the framework;
e. hoisting a steel bar framework: hoisting the reinforcement cage to a transport vehicle at multiple points simultaneously by using a gantry crane, arranging a bracket before the transport vehicle is lifted, and fixing the reinforcement cage by using a lock after loading;
f. embedding a bearing platform steel reinforcement framework: pre-embedding and installing a bearing platform steel reinforcement framework, firstly carrying out rough installation mainly by visual inspection, carrying out leveling and fine installation by using a leveling pipe after the installation is in place, immediately fixing the steel reinforcement framework after the fine installation is in place to ensure that the steel reinforcement framework does not move any more during pouring, and carrying out concrete pouring;
g. butt-joint installation of pier body steel reinforcement frameworks: utilize hoist combination multiple spot hoist to carry out framework of steel reinforcement hoist and mount, constructor settles 2 location steel pipes in pier shaft framework circular arc chamfer position, can begin the main muscle butt joint when the owner muscle in close contact with, inboard main muscle joint is installed earlier to torque wrench, the whole back of targetting in place of installing of inboard main muscle joint, the connection that outside main muscle connects is carried out to same technology, accomplish the aerial whole butt joint of pier shaft framework of steel reinforcement so stage by stage, framework of steel reinforcement butt joint finishes, each 50 ~ 55 cm's stirrup and hook bar about artifical erection joint department, installation protective layer cushion, the template, concreting, treat that concrete strength satisfies the demands, install lower section framework of steel reinforcement again, so circulate until pier shaft capping.
Preferably, in the step a, the deviation value of the position of the notch on the jig frame is less than 2 mm.
Preferably, the prefabricating process of the steel bar framework in the step c and the step d comprises the following steps:
bending main ribs by using a numerical control bending machine to ensure that the bending angle of each main rib is consistent, positioning the main ribs by using notches on a jig frame, connecting two sections of main ribs by using rolling straight thread sleeves, and ensuring that no gap is left between main rib joints during butt joint;
installing stirrups and hook reinforcements on the main reinforcements, welding and fixing the stirrups and the main reinforcements and the hook reinforcements by gas shielded welding, wherein the welding operation is carried out by CO2Welding is carried out under gas, the welding current is controlled to be 210-280A, the arc voltage is controlled to be 30-37V, and introduced CO2The gas flow is 15-25L/min.
Preferably, in the step d, when the two side-by-side main reinforcements of the steel reinforcement framework are prefabricated, a positioning grid is welded between the two rows of main reinforcements, and the positioning grid is removed after the butt joint installation is completed.
Preferably, in the step e, the simultaneous multi-point hoisting is to install two double-limb steel pipes or channel steel with the length of 6m at two ends of the steel reinforcement framework respectively as carrying pole beams, and perform four-point synchronous hoisting.
Compared with the prior art, the on-site construction method of the urban fabricated vase pier steel reinforcement framework disclosed by the invention has the following beneficial effects:
the steel bar frameworks in the bridge piers are processed indoors in a prefabricated mode, so that the operation environment of workers can be improved, the processing precision of the steel bar frameworks can be ensured through the combined type jig frame, synchronous processing of a plurality of steel bar frameworks can be realized through the use of a plurality of jig frames, the construction period is greatly shortened, and the efficiency is improved;
the high-precision processing equipment is adopted for prefabricating the steel bar framework, the problem that the size of the steel bar is difficult to control can be solved, the mounting precision of the steel bar is effectively ensured by the design of the notch on the jig frame, and the feasibility of subsequent butt joint mounting is ensured;
the welding adopts gas shielded welding and CO2The gas shielded welding process has no welding slag, the welding seam is firm and uniform, the phenomenon that the current of common arc welding generates larger welding stress can be effectively avoided by controlling the welding parameter value during welding, meanwhile, the phenomenon that the steel bar is burnt during welding due to the larger current control can be effectively avoided, the processing and mounting precision of the steel bar framework is ensured, the integral rigidity of the steel bar framework is enhanced, and the using amount of the constructed steel bar is not additionally increased;
the steel reinforcement framework is lifted and transported integrally by adopting multiple points and simultaneously lifting and matching with the bracket, so that the steel reinforcement framework with the large pier body is ensured not to deform in multiple links such as lifting, shifting, transporting, unloading and the like;
the construction method realizes standardized, programmed, modularized and industrialized operation of integral manufacturing and installation of the pier body steel reinforcement framework, can greatly improve the working environment of workers and field technical management personnel, realizes parallel operation, greatly shortens the construction period of the pier body and improves the working efficiency; the pier body steel reinforcement framework is integrally butted, so that the service time and frequency of hoisting equipment are reduced, energy conservation and emission reduction are facilitated, the cost is reduced, the overhead working time is greatly shortened by the integral butt joint process, and the safety risk is reduced from the source.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention.
The invention discloses a site construction method for a steel bar framework of an urban fabricated vase pier, which comprises the following steps:
a. early preparation: combine pier shaft framework of steel reinforcement structural feature, design out the convenient light steel bed-jig of dismantling, equipment, can realize different cross sectional dimension, different length pier shaft framework of steel reinforcement prefabrication, the bed-jig is formed by multiple steel sheet, and channel-section steel and angle steel can be dismantled random combination, not only equipment easy operation, resources are saved of still great degree, cyclic utilization reduces the cost, improves pier shaft framework of steel reinforcement quality and protective layer qualification rate, and the finish machining has the positioning groove mouth of a plurality of fixed main muscle on the bed-jig, and positioning groove mouth positional deviation all controls in 2mm, ensures that main muscle interval 100% satisfies standard and drawing requirement, and easy and simple to handle.
b. Mounting a jig frame: the method comprises the steps of conveying processed jig frame components to a prefabricating site in a rod piece mode, assembling the jig frame on a hardened site through connecting pins to form the jig frame, measuring and paying off the jig frame, accurately determining the plane position of a base in the prefabricating site, and then sequentially connecting accessories through bolts to complete assembling work of a set of jig frame. A plurality of jig frames are positioned to form a production line, and the space between the jig frames is 2.5-3 m.
c. Prefabricating a bearing platform steel reinforcement framework: the bearing platform steel reinforcement framework is prefabricated on the jig frame, the main reinforcements are bent by a numerical control bending machine during the prefabrication, the bending angle of each main reinforcement is ensured to be consistent, the main reinforcements are positioned by the notch on the jig frame, two sections of main reinforcements are connected by rolling straight thread sleeves, and no gap is left between the joints of the main reinforcements during butt joint,
installing stirrups and hook reinforcements on the main reinforcements, welding and fixing the stirrups and the main reinforcements and the hook reinforcements by gas shielded welding, wherein the welding operation is carried out by CO2Welding is carried out under gas, the welding current is controlled to be 210-280A, the arc voltage is controlled to be 30-37V, and introduced CO2The gas flow is 15-25L/min;
for avoiding the uneven whole aerial butt joint that leads to of main muscle end, set up a termination support at cushion cap steel reinforcement skeleton root, the support adopts the channel-section steel processing to form, and the support can remove at any time according to the needs of production work, sets up a plurality of lugs at steel reinforcement skeleton top in addition, ensures that the long muscle of fore shaft is in a plane when cushion cap steel reinforcement skeleton is prefabricated, and the short muscle is in a plane, and the lug is in a plane.
d. Prefabricating a pier body steel reinforcement framework: the multi-section pier body steel reinforcement framework is synchronously processed by utilizing a jig frame growth line, main reinforcements are bent by utilizing a numerical control bending machine during prefabrication, the bending angle of each main reinforcement is ensured to be consistent, the main reinforcements are positioned by utilizing notches on the jig frame, one end of each main reinforcement adopts standard wires, the other end of each main reinforcement adopts a long wire, two sections of main reinforcements are connected by adopting rolling straight thread sleeves, and a gap is not left between joints of the main reinforcements during butt joint,
the stirrups and the hook reinforcements are arranged on the main reinforcements, the installation density of the stirrups on the middle third section of the main reinforcements is 1.5-2 times of that on the two ends, the stirrups and the main reinforcements and the hook reinforcements are welded and fixed by gas shielded welding, and the welding operation is carried out by CO2Welding is carried out under gas, the welding current is controlled to be 210-280A, the arc voltage is controlled to be 30-37V, and introduced CO2The gas flow is 15-25L/min, when the stirrups and the hook bars are installed, the stirrups and the hook bars are not installed within 50-55 cm of the upper portion and the lower portion of the steel reinforcement framework joint, and after the installation is finished, manual field installation is carried out. When the side-by-side double main reinforcements of the steel reinforcement framework are prefabricated, a positioning grid is welded between the double main reinforcements, the convenience of connection of the butt joint sleeve is ensured, and the positioning grid is cut out and drawn out after all the joints on the inner side of the steel reinforcement framework are installed.
In order to ensure that the reinforcing steel bar framework is not deformed in the processes of transportation, hoisting and installation, after the whole reinforcing steel bar framework is manufactured, a main rib in the same groove is selected from each section of reinforcing steel bar framework to be marked as a positioning rib, so that the integral reinforcing steel bar framework is convenient to install on site.
After the whole steel reinforcement framework is manufactured in the same groove, the frame can be taken off. After the whole steel reinforcement framework is transported, the bed jig stand column and the cross beam are installed, and the next steel reinforcement framework can be prefabricated conveniently and quickly.
e. Hoisting a steel bar framework: after the reinforcement cage is machined, the jig frame is removed, the steel reinforcement cage is moved by using a gantry crane and hoisted to a transport vehicle, and during hoisting, because the whole welding rigidity of the reinforcement cage is high, two double-limb steel pipes or channel steel with the length of 6m are respectively installed at two ends of the reinforcement cage as carrying pole beams during hoisting in the future, and four-point synchronous hoisting is carried out.
The great bracket of rigidity is set up on the transport vechicle before the framework of steel reinforcement loading, fixes the framework of steel reinforcement on the transport vechicle with the better tool to lock of toughness after the loading, prevents that the framework of steel reinforcement from warping on the way of transporting.
f. Embedding a bearing platform steel reinforcement framework: pre-embedding and installing a bearing platform steel reinforcement framework, firstly carrying out rough installation mainly by visual inspection, carrying out leveling and fine installation by using a leveling pipe after the installation is in place, immediately fixing the steel reinforcement framework after the fine installation is in place to ensure that the steel reinforcement framework does not move any more during pouring, and carrying out concrete pouring;
g. butt-joint installation of pier body steel reinforcement frameworks: utilize hoist combination multiple spot hoist to carry out the framework of steel reinforcement hoist and mount, constructor settles 2 location steel pipes (the location reinforcing bar that corresponds uses the paint to make the mark when the framework of steel reinforcement is whole prefabricated at pier shaft framework circular arc chamfer position, location steel pipe adopts 48 phi 3.5mm scaffold pipe, single length 40cm), for avoiding framework of steel reinforcement left and right sides to rock, cause the injury to the operation workman, main muscle just in time can begin the main muscle butt joint when in close contact with.
The torque wrench installs the inboard owner muscle and connects earlier, and the inboard owner muscle connects all to install the back in place, takes out the grid between the double main muscle, and the same technology carries out the connection that the outside owner muscle connects, accomplishes pier shaft framework whole butt joint in the air stage by stage so, and the framework of steel reinforcement butt joint finishes, and 50 ~ 55cm stirrup and hook bar about artifical erection joint department respectively, installation protective layer cushion, template, concreting, treat that concrete strength satisfies the requirement, install lower section framework of steel reinforcement again, so circulate until pier shaft capping.
When severe working conditions such as high wind, high altitude and the like are met, the pier body steel reinforcement framework can be safely and smoothly butted by the aid of the openable door type integrally closed movable operating platform.
The pier body steel reinforcement framework butt joint method has high work efficiency of integral butt joint in the air, finally realizes the standardized, modularized, programmed and industrialized operation of integral manufacture and installation of the pier body steel reinforcement framework, greatly improves the working environment of workers and field technical management personnel, realizes parallel operation, greatly compresses the pier body construction period, improves the work efficiency, reduces the safety risk from the source, reduces the use time and frequency of hoisting equipment, and has great significance for saving energy, reducing cost and protecting environment.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.

Claims (5)

1. The on-site construction method of the urban fabricated vase pier steel reinforcement framework is characterized by comprising the following steps:
a. early preparation: designing a jig frame according to a pier body reinforcement framework structure, wherein the jig frame is formed by detachably combining a plurality of steel plates, channel steel and angle steel, and a plurality of main reinforcement positioning notches are finely machined in the jig frame;
b. mounting a jig frame: assembling the processed jig frame components through connecting pins to form a jig frame, and arranging a plurality of jig frames at intervals to form a production line, wherein the distance between the jig frames is 2.5-3 m;
c. prefabricating a bearing platform steel reinforcement framework: prefabricating a bearing platform steel reinforcement framework by using a jig frame, arranging a sealing end bracket at the bottom of the steel reinforcement framework after prefabrication is finished, and arranging a plurality of lifting lugs at the top of the steel reinforcement framework;
d. prefabricating a pier body steel reinforcement framework: synchronously processing a plurality of sections of pier body steel reinforcement frameworks by utilizing a jig frame growth line, connecting main reinforcements by adopting rolling straight thread sleeves during prefabrication, adopting standard wires at one end of each main reinforcement, adopting a long wire at the other end, welding stirrups on the main reinforcements at intervals, wherein the installation density of the stirrups on the middle third section of the main reinforcements is 1.5-2 times that of the two ends, simultaneously not installing the stirrups and drag hooks in 50-55 cm ranges above and below a connector, and selecting one main reinforcement with the same groove in each section of steel reinforcement framework to mark as a positioning reinforcement before taking off the framework;
e. hoisting a steel bar framework: hoisting the reinforcement cage to a transport vehicle at multiple points simultaneously by using a gantry crane, arranging a bracket before the transport vehicle is lifted, and fixing the reinforcement cage by using a lock after loading;
f. embedding a bearing platform steel reinforcement framework: pre-embedding and installing a bearing platform steel reinforcement framework, firstly carrying out rough installation mainly by visual inspection, carrying out leveling and fine installation by using a leveling pipe after the installation is in place, immediately fixing the steel reinforcement framework after the fine installation is in place to ensure that the steel reinforcement framework does not move any more during pouring, and carrying out concrete pouring;
g. butt-joint installation of pier body steel reinforcement frameworks: utilize hoist combination multiple spot hoist to carry out framework of steel reinforcement hoist and mount, constructor settles 2 location steel pipes in pier shaft framework circular arc chamfer position, can begin the main muscle butt joint when the owner muscle in close contact with, inboard main muscle joint is installed earlier to torque wrench, the whole back of targetting in place of installing of inboard main muscle joint, the connection that outside main muscle connects is carried out to same technology, accomplish the aerial whole butt joint of pier shaft framework of steel reinforcement so stage by stage, framework of steel reinforcement butt joint finishes, each 50 ~ 55 cm's stirrup and hook bar about artifical erection joint department, installation protective layer cushion, the template, concreting, treat that concrete strength satisfies the demands, install lower section framework of steel reinforcement again, so circulate until pier shaft capping.
2. The pier site construction method for the prefabricated reinforcement cage according to claim 1, wherein: in the step a, the deviation value of the position of the positioning notch on the jig frame is less than 2 mm.
3. The pier site construction method for the prefabricated reinforcement cage according to claim 1, wherein: the prefabricating process of the steel bar framework in the step c and the step d comprises the following steps:
bending main ribs by using a numerical control bending machine to ensure that the bending angle of each main rib is consistent, positioning the main ribs by using notches on a jig frame, connecting two sections of main ribs by using rolling straight thread sleeves, and ensuring that no gap is left between main rib joints during butt joint;
installing stirrups and hook reinforcements on the main reinforcements, welding and fixing the stirrups and the main reinforcements and the hook reinforcements by gas shielded welding, wherein the welding operation is CO2Welding is carried out under gas, the welding current is controlled to be 210-280A, the arc voltage is controlled to be 30-37V, and introduced CO2The gas flow is 15-25L/min.
4. The pier site construction method for the prefabricated reinforcement cage according to claim 1, wherein: and d, welding a positioning grid between the double rows of main ribs when the double rows of main ribs of the steel reinforcement framework are prefabricated, and removing the positioning grid after the butt joint installation is finished.
5. The pier site construction method for the prefabricated reinforcement cage according to claim 1, wherein: in the step e, the multipoint simultaneous hoisting is to install two double-limb steel pipes or channel steel with the length of 6m at two ends of the steel reinforcement framework respectively as carrying pole beams, and carry out four-point synchronous hoisting.
CN201911155373.5A 2019-11-22 2019-11-22 On-site construction method for urban assembled vase pier steel reinforcement framework Pending CN110804943A (en)

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CN111472553A (en) * 2020-04-27 2020-07-31 中建七局安装工程有限公司 Thin-wall hollow pier intensive type reinforcement modular construction method

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