CN110468723B - Installation and construction method for wrapping steel plate outside main pier of swivel bridge - Google Patents
Installation and construction method for wrapping steel plate outside main pier of swivel bridge Download PDFInfo
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- CN110468723B CN110468723B CN201910816639.XA CN201910816639A CN110468723B CN 110468723 B CN110468723 B CN 110468723B CN 201910816639 A CN201910816639 A CN 201910816639A CN 110468723 B CN110468723 B CN 110468723B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 171
- 239000010959 steel Substances 0.000 title claims abstract description 171
- 238000010276 construction Methods 0.000 title claims abstract description 69
- 238000009434 installation Methods 0.000 title abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 27
- 230000002787 reinforcement Effects 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 13
- 238000012946 outsourcing Methods 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000009415 formwork Methods 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 4
- 229910000746 Structural steel Inorganic materials 0.000 abstract description 2
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the field of construction of an outsourcing steel plate of a main pier of a swivel bridge, and particularly relates to a mounting construction method of the outsourcing steel plate of the main pier of the swivel bridge. The invention adopts the integral installation mode of the embedded outer steel plate and the flange to solve the problem of high-precision installation; the method that the main pier stirrups and the outer steel plate are hoisted together in sections is adopted, the problem that the outer steel plate shear nails conflict with the main pier body stirrups is solved, the construction quality of the main pier body is guaranteed, and the construction period is effectively shortened; the outer steel plates are assembled in sections, and the inner side surfaces of the steel plates are provided with transverse and longitudinal steel supports and a chain block zipper for shaping the inner side surfaces of the steel plates; four faces in the steel plate outside are provided with oblique-pulling steel wires and U-shaped 20 channel steel for reinforcement, the outer side face of the steel plate is shaped, accurate alignment is carried out, and deformation in the steel plate installation and welding process is effectively controlled. The construction method is suitable for the construction of the outer wrapping steel plate which plays a role in restraining the concrete in the design of the structural steel plate.
Description
Technical Field
The invention belongs to the field of construction of an outsourcing steel plate of a main pier of a swivel bridge, and particularly relates to a mounting construction method of the outsourcing steel plate of the main pier of the swivel bridge.
Background
Along with the development of bridge construction in China, more and more bridges need to cross roads and railways, and swivel construction has the characteristics of short construction period, guarantee of safe operation of business lines, small occupied space and the like.
Disclosure of Invention
Aiming at the installation of the outer steel plate of the main pier of the swivel bridge at present, the invention forms a reliable construction process for the construction of the outer steel plate of the main pier of the swivel bridge, in particular to a construction method for installing the outer steel plate of the main pier of the swivel bridge, which ensures the operation safety of construction and railways and urban railways and has obvious economic benefit and social benefit.
The invention is realized by adopting the following technical scheme: the mounting and construction method for the steel plate wrapped outside the main pier of the swivel bridge comprises the following steps:
(1) go up cushion cap bottom reinforcing bar, prestressing force construction and pre-buried outsourcing steel sheet flange and assemble synchronous construction: constructing the upper rotating bearing platform by adopting a wood formwork method, and installing transverse and longitudinal prestressed steel strands and a pipeline layer after binding bottom layer steel bars and vertical bars; the embedded externally-wrapped steel plate is connected with the steel plate flange in a hole-to-hole mode through bolts, the whole assembling process and the construction of the bottom layer of the upper bearing platform are synchronously carried out, the whole assembling process is finished outside a main pier foundation pit, and a leveling instrument is used for controlling and adjusting the whole hole-to-hole process;
(2) integrally installing an outer steel plate flange: after the construction of bottom layer steel bars and prestress is finished, installing an embedded part positioning framework in an upper bearing platform, hoisting an embedded outer steel plate flange integrally by adopting a crawler crane, and welding the embedded outer steel plate flange with the positioning framework after the total station is positioned and leveled;
(3) binding upper-layer steel bars of the upper bearing platform, performing prestress construction, pre-embedding pier stud steel bars and pouring concrete;
(4) main pier body main reinforcement and prestressed reinforcement subsection construction: pouring the pier body concrete in multiple times, wherein the number of the subsection sections of the main pier body reinforcement is the same as the pouring times of the pier body, the prestressed reinforcement is segmented, and joints are connected by adopting connectors;
(5) installing a main pier stirrup and an outer steel plate, and reinforcing and constructing in sections: the main pier adopts an outer steel plate as a template for construction, the outer steel plate adopts segmented hoisting welding, the outer steel plate at the bottom layer is firstly welded with an embedded outer steel plate, the stirrups of the main pier and the outer steel plate are hoisted at equal segments, the stirrups are made into an L shape, the stirrups are bound on shear nails at the inner side of the outer steel plate, the segmented steel plate and the segmented stirrups are hoisted simultaneously, the total station is accurately in place, the stirrups are scattered and connected with the main reinforcements after the outer steel plate is in place, and the construction of the prestressed reinforcement is not influenced;
(6) pouring and maintaining the main pier body in multiple times.
According to the installation and construction method of the main pier outer wrapping steel plate of the swivel bridge, the horizontal steel support, the longitudinal steel support and the inverted chain zipper are arranged in the main pier outer wrapping steel plate, and the cable-stayed steel wires and the U-shaped 20 channel steel are arranged on four sides of the outer side of the main pier outer wrapping steel plate for reinforcement.
In the installation and construction method for the steel plate wrapped outside the main pier of the swivel bridge, the positioning framework is formed by welding U-shaped 30-channel steel.
The embedded outer steel plate of the main pier of the swivel bridge is accurately connected with the flange steel plate in a hole-aligning mode through bolts, the embedded outer steel plate is embedded in the upper bearing platform in a conventional mode, and after all construction of the reinforcing steel bars and the prestressed tendons of the bearing platform is completed, the holes are aligned through the bolts, so that the hole-aligning requirements of the steel plate and the flange steel plate cannot be met on site. Therefore, the construction of the embedded steel plate and the flange steel plate adopts an integral installation mode, the embedded steel plate and the flange steel plate are synchronously constructed with the upper bearing platform of the rotating body after the holes are accurately aligned, the embedded steel plate positioning framework is installed after the first layer of prestressed tendons and the corrugated pipe of the upper bearing platform are constructed, and the steel plate is integrally hoisted and accurately positioned.
Main mound outsourcing steel sheet and main mound pier shaft stirrup can not be under the normal condition be under construction in step because the shear force nail is established to outsourcing steel sheet inboard, no matter construct earlier outsourcing steel sheet or stirrup, and the position conflict appears when both lead to shear force nail and stirrup installation because on-the-spot construction reason, can't guarantee the normal construction and the required quality of steel sheet and reinforcing bar. The turning main pier body outer wrapping steel plate adopts a method of synchronous construction by sections and stirrup sections, and successfully solves the problem of position conflict when the shear nails and stirrups are installed. The main pier stirrup and the outer steel plate are hoisted in sections, the stirrup is made into an L shape, under the condition that the lapping length of the steel bars meets the standard requirement, the steel bars are bound on the shear nails on the inner side of the outer steel plate, the subsection steel plate and the subsection steel bars are hoisted simultaneously, the total station is accurately in place, the stirrup is scattered and connected with the main reinforcement after the steel plates are in place, the problem of conflict between the steel plates and the steel bars in construction is solved, the pier body steel plate and the steel bar construction quality are guaranteed, and meanwhile the construction period requirement is met.
In order to further ensure that the outer-coated steel plate does not deform when the concrete is poured, supports and chain-reversing zippers are arranged in the steel plate, diagonal steel wires and U-shaped 20-channel steel are arranged on four sides of the outer side of the steel plate for reinforcement, the concrete is poured in different times, and the deformation of the steel plate is effectively controlled.
The construction method of the invention has the following technical advantages:
(1) the problem of high-precision installation is solved by adopting an integral installation mode of the embedded outer-wrapped steel plate and the flange;
(2) the method that the main pier stirrups and the outer steel plate are hoisted together in sections is adopted, the problem that the outer steel plate shear nails conflict with the main pier body stirrups is solved, the construction quality of the main pier body is guaranteed, and the construction period is effectively shortened;
(3) the outer steel plates are assembled in sections, and the inner side surfaces of the steel plates are provided with transverse and longitudinal steel supports and a chain block zipper for shaping the inner side surfaces of the steel plates; four faces in the steel plate outside are provided with oblique-pulling steel wires and U-shaped 20 channel steel for reinforcement, the outer side face of the steel plate is shaped, accurate alignment is carried out, and deformation in the steel plate installation and welding process is effectively controlled.
The construction method is suitable for the construction of the outer wrapping steel plate which plays a role in restraining the concrete in the design of the structural steel plate.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a flow chart of a pier construction process.
Detailed Description
The construction process flow and the operation points of the invention are explained in detail, and the construction process flow is shown in figure 1.
The key points of the operation
Upper bearing platform bottom layer steel bar, prestress construction and embedded outer wrapping steel plate flange assembling synchronous construction
The swivel upper bearing platform is constructed by adopting a wood mould method, and after bottom layer steel bars and vertical bars are bound, transverse and longitudinal prestressed steel strands and pipelines are installed in layers. The embedded steel plates and the steel plate flanges are connected with the holes through M45 high-strength bolts, the whole assembling process and the construction of the bottom layer of the upper bearing platform are synchronously carried out, the whole assembling process is finished outside a main pier foundation pit, and the whole process of the holes is controlled and adjusted through a level gauge.
Integral installation of steel plate wrapped flange
The upper bearing platform is constructed by adopting a wood formwork erecting method, after bottom layer steel bars and prestress construction are completed, an embedded part positioning framework is installed in the upper bearing platform, the positioning framework is welded by adopting U-shaped 30-channel steel, the embedded outer-coated steel plate flange is integrally hoisted by adopting a 500-ton crawler crane, and the total station is welded with the positioning framework after positioning and leveling.
Binding upper-layer steel bars of an upper bearing platform, constructing prestress, embedding pier stud steel bars, and pouring concrete
The upper bearing platform is designed to be octagonal, the upper layer of steel bars need to be bound, the position of a prestressed notch needs to be reserved, the prestress is designed to be arranged in a quincunx mode in a symmetrical, layered and unequal distance mode, the prestress pipeline needs to be straightened when the prestress is penetrated, finally pier stud steel bars are embedded, and the embedding depth is guaranteed to be 2.1 m.
Main pier body main reinforcement and prestressed reinforcement segmented construction
The main pier adopts a permanently-shaped steel plate wrapped outside to construct a template, the pier body adopts a hollow thin-wall pier, the cross section size is 6 x 11.2m, the transverse bridge wall thickness is 1.5m, and the forward bridge wall thickness is 1.2 m. The outer steel plate is hoisted and welded in sections, the pier body concrete is poured in four times, the main pier body reinforcement section is the same as the pier body pouring, 11m of phi 32 finish rolling deformed steel bar prestressed bars are 408 long and are divided into 2 sections, and joints are connected by connectors.
Main pier stirrup and outer steel plate installation and reinforcement segmented construction
The main pier stirrup and the outer steel plate are hoisted in equal sections, the stirrup is made into an L shape, the stirrup overlapping length is guaranteed to meet the requirement of the specification, the stirrup is bound on the shear nails on the inner side of the outer steel plate, the inner side of the steel plate is derusted before the stirrup is bound, 3 rows of stirrups are bound in each row of shear nails, the segmental outer steel plate and the segmental stirrups are hoisted simultaneously, the joints are staggered to meet the requirement of construction and specification, the total station is accurately in place, the outer steel plate is scattered to be connected with the main reinforcements after being in place, the prestress finish rolling deformed steel bar construction is not influenced, shear nails with the distance of 30cm are arranged in the main pier outer steel plate, no deformation occurs when the outer steel plate is used for pouring concrete, supports and chain reversing zippers are arranged in the outer steel plate, diagonal steel wires are arranged on the four sides of the outer side, U-shaped 20 reinforcement is arranged in the.
Four-time pouring maintenance of main pier body
The pier body adopts a hollow thin-wall pier, the cross section size is 6 x 11.2m, the transverse bridge wall thickness is 1.5m, and the forward bridge wall thickness is 1.2 m. The outer steel plate is hoisted and welded in sections. Pouring the pier body concrete four times, pouring the solid section 1m high at the bottom of the pier body for the first time, pouring the hollow section 9m high for the second time, pouring the pier beam anchoring section once after the bottom layer of the steel box beam is installed, and performing sprinkling maintenance in time to meet the requirements of finish rolling deformed steel bar construction specifications.
Quality control
Before the main pier is constructed, the accurate positions of the pier center line and the pier inner and outer contour lines are set on the top surface of the foundation.
Reinforcing bar processing and installation
1. Binding and forming pier body steel bars on site; the processing of the steel bars adopts centralized processing of a steel bar factory. And after the transportation to the field, the manual lifting and binding are adopted.
2. After the steel bars are checked to be qualified, the steel bars are cut off, welded and bent in a centralized mode in a processing field, then the steel bars are conveyed to a main pier to be bound and formed manually, and all processing and binding indexes of the steel bars are strictly controlled within allowable deviation.
3. The steel bar protection layer uses a plastic arc cushion block to ensure the surface quality of concrete. The number, diameter, length, number arrangement, position and the like of the reinforcing steel bars all meet the design requirements.
4. The joint of the main reinforcement of the structure adopts double-sided lap welding, and the main reinforcement and the stirrup are bound by binding wires. The bound or welded reinforcing mesh and reinforcing cage have no deformation and loosening phenomenon.
Pier body steel plate
1. The main pier outer mold is directly wrapped with a steel plate outside the pier, the outer mold is erected during construction, 1.5 × 2.0m construction door openings are reserved around the outer mold, and then the construction door openings are filled. And binding steel bars after the outer mold is arranged, finally erecting the inner mold, and adopting a wood mold as the inner template. The outer contour line of the structure is accurately discharged before the template is erected, the substrate is accurately leveled, the leveling error is controlled within 2mm, and the verticality of the assembled template is ensured to meet the standard requirement. And hoisting the reinforcing steel bars and assembling the template by adopting a manual matching crawler crane. Mechanical hoisting is considered during template design, and hoisting points are designed for hoisting to prevent template deformation during hoisting. The perpendicularity and the geometric shape of the template are checked every time a section of template is hoisted, and the upper layer can be continuously spliced after the template is error-free. And fastening each reinforcing bolt after the formwork erection is finished.
2. Pier body concrete transportation and pouring
Before concrete pouring, chiseling the concrete at the joint of the foundation and the pier body, removing floating slurry and welding slag, washing the concrete clean, and renovating the connecting steel bars.
The concrete is intensively mixed by a mixing station, transported by a concrete conveying tank car, pumped in place and fed into a mould through a cylinder string.
3. The pier construction process flow is shown in fig. 2.
4. Construction of embedded parts
In order to ensure the accurate position of the embedded part, a fixing measure is taken for the embedded part so as to prevent the embedded part from moving when the concrete is vibrated; the concrete below and near the embedded part needs to be closely vibrated; the exposed part of the embedded part on the pier needs to be marked obviously, and when the embedded part is poured to the top concrete, the exposed part needs to be noticed to be accurate in size; when welding is carried out on embedded parts embedded in piers and table caps, thin welding rods and small current are adopted as much as possible, and layered welding is carried out to avoid burning concrete.
In the concrete pouring process, whether the positions of the arranged embedded parts, the preformed holes and the embedded supports move or not is observed at any time, if the displacement is found, the correction is carried out in time, the condition of the template is also noticed in the pouring process, and if the displacement is generated, the correction and the reinforcement are carried out immediately.
5. Removal of formwork
Maintaining the belt mold for at least 3 days, and removing the inner mold after the whole pier is completely poured to reach 15Mpa, and sequentially moving from top to bottom. The outer die steel plate plays a permanent protection role and is not detached.
6. Curing of concrete
Maintaining for at least 3 days with the mold, immediately covering the concrete after mold removal with heat-preserving and moisture-preserving geotextile, externally pasting a water-proof plastic film, using an automatic water-spraying system and a sprayer, continuously maintaining, avoiding forming dry and wet circulation, removing the health-preserving blanket after the maintenance time is not less than 7d, closely covering with the plastic film, and maintaining for more than 14 d.
And during maintenance, before the strength of the concrete does not reach the specified strength, the template is not removed. The strength of the concrete meets the requirement of form removal, and the form removal is carried out when the temperature difference between the core concrete and the surface concrete and the temperature difference between the surface concrete and the environment are not more than 15 ℃.
Claims (3)
1. A mounting and construction method for an outer steel plate of a main pier of a swivel bridge is characterized by comprising the following steps:
(1) go up cushion cap bottom reinforcing bar, prestressing force construction and pre-buried outsourcing steel sheet flange and assemble synchronous construction: constructing the upper rotating bearing platform by adopting a wood formwork method, and installing transverse and longitudinal prestressed steel strands and a pipeline layer after binding bottom layer steel bars and vertical bars; the embedded externally-wrapped steel plate is connected with the steel plate flange in a hole-to-hole mode through bolts, the whole assembling process and the construction of the bottom layer of the upper bearing platform are synchronously carried out, the whole assembling process is finished outside a main pier foundation pit, and a leveling instrument is used for controlling and adjusting the whole hole-to-hole process;
(2) integrally installing an outer steel plate flange: after the construction of bottom layer steel bars and prestress is finished, installing an embedded part positioning framework in an upper bearing platform, hoisting an embedded outer steel plate flange integrally by adopting a crawler crane, and welding the embedded outer steel plate flange with the positioning framework after the total station is positioned and leveled;
(3) binding upper-layer steel bars of the upper bearing platform, performing prestress construction, pre-embedding pier stud steel bars and pouring concrete;
(4) main pier body main reinforcement and prestressed reinforcement subsection construction: pouring the pier body concrete in multiple times, wherein the number of the subsection sections of the main pier body reinforcement is the same as the pouring times of the pier body, the prestressed reinforcement is segmented, and joints are connected by adopting connectors;
(5) installing a main pier stirrup and an outer steel plate, and reinforcing and constructing in sections: the main pier adopts an outer steel plate as a template for construction, the outer steel plate adopts segmented hoisting welding, the outer steel plate at the bottom layer is firstly welded with an embedded outer steel plate, the stirrups of the main pier and the outer steel plate are hoisted at equal segments, the stirrups are made into an L shape, the stirrups are bound on shear nails at the inner side of the outer steel plate, the segmented steel plate and the segmented stirrups are hoisted simultaneously, the total station is accurately in place, the stirrups are scattered and connected with the main reinforcements after the outer steel plate is in place, and the construction of the prestressed reinforcement is not influenced;
(6) pouring and maintaining the main pier body in multiple times.
2. The installing and constructing method of the steel plate wrapping the main pier of the swivel bridge as claimed in claim 1, wherein the steel plate wrapping the main pier is internally provided with horizontal and longitudinal steel supports and a chain block zipper, and the outer sides of the steel plate wrapping the main pier are provided with cable-stayed steel wires and U-shaped 20 channel steel for reinforcement.
3. The mounting and construction method for the steel plate wrapped outside the main pier of the swivel bridge as claimed in claim 1 or 2, wherein the positioning frame is formed by welding U-shaped 30-channel steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910816639.XA CN110468723B (en) | 2019-08-30 | 2019-08-30 | Installation and construction method for wrapping steel plate outside main pier of swivel bridge |
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| CN201910816639.XA CN110468723B (en) | 2019-08-30 | 2019-08-30 | Installation and construction method for wrapping steel plate outside main pier of swivel bridge |
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| CN110468723A CN110468723A (en) | 2019-11-19 |
| CN110468723B true CN110468723B (en) | 2020-11-06 |
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| CN112458908B (en) * | 2020-11-12 | 2022-04-01 | 北京城建道桥建设集团有限公司 | Construction method for steel hoops of pier anti-seismic facility in two-step accurate-in-place mode |
| CN113062232B (en) * | 2020-12-22 | 2022-08-26 | 李涛 | Road bridge prestress reinforcing device and using method thereof |
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