CN111021222B - Construction method of large-span concrete-filled steel tube tied arch bridge - Google Patents
Construction method of large-span concrete-filled steel tube tied arch bridge Download PDFInfo
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- CN111021222B CN111021222B CN202010048373.1A CN202010048373A CN111021222B CN 111021222 B CN111021222 B CN 111021222B CN 202010048373 A CN202010048373 A CN 202010048373A CN 111021222 B CN111021222 B CN 111021222B
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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
- E01D4/00—Arch-type 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
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Abstract
A construction method of a large-span concrete-filled steel tube tied arch bridge relates to a construction method of a concrete-filled steel tube tied arch bridge. The invention mainly aims to solve the problems of long occupied time of the support and the like caused by the existing pre-built support assembling method. Constructing the arch springing and the continuous beam No. 0 block together, and pre-burying 2/3 lengths of the No. 1 segment arch rib in the arch springing; concrete is poured into the No. 1 section arch rib steel pipe, and the No. 1 arch rib and the temporary support are welded firmly. Constructing a bridge deck main beam, and pre-burying an anchor box at a corresponding position of a suspender; and simultaneously constructing from both ends inwards according to the sequence of building the next bracket and installing the next segmental arch rib. The closure section is installed according to the sequence of closing the right arch rib of the closure section firstly and then closing the left arch rib of the closure section, and is temporarily fixed. Welding and fixing the indirect seam between the arch ribs of the adjacent sections; pouring arch rib concrete; removing the bracket; installing a suspender; tensioning the suspender; and (5) coating finish paint of a steel structure. The advantage is that construction speed is fast, and the support is gone on along with the installation progress, and operating space is sufficient on the bridge.
Description
The technical field is as follows:
the invention relates to a construction method of a concrete filled steel tube tied arch bridge, in particular to a construction method of a concrete filled steel tube tied arch bridge with a span of 150 m.
Background art:
the theoretical research and the engineering application of the steel pipe concrete structure are more and more deep and wide in China, the structure is applied to the arch bridge, shows great superiority in the aspects of mechanical property, construction, economy, attractiveness and the like, and the development of the arch bridge is greatly promoted. The construction method of the steel tube concrete tied arch bridge mainly comprises a cable hoisting method, a flat ( vertical) swivel construction method and a pre-built support splicing method. The cable hoisting method needs to arrange cable towers at the bridge head and the bridge tail, and a cable is erected between the two cable towers, so that the method has huge cost. The construction mode of turning is applied to reinforced concrete arch structure more, and is applied for the arch bridge of large-span less. Most of the prior pre-erection support assembling methods are applied, the supports are erected at one time, and then the arch ribs are installed, so that the support occupies a long time, the cost is increased, in addition, the supports can influence the hoisting of the arch ribs, and the safety risk is increased.
The invention content is as follows:
the technical problem to be solved by the invention is to provide a construction method of a large-span concrete-filled steel tube tied arch bridge, which solves the difficult problem of installation and construction of a steel tube arch steel structure, improves the construction progress of the concrete-filled steel tube tied arch bridge, and has safe construction and high installation precision.
The invention solves the above problems by the following technical proposal;
the arch ribs of the tied arch bridge adopt vertical parallel arches, and the arch ribs on the left side of the bridge floor are respectively as follows from front to back: front No. 1 left side segment arch rib, front No. 2 left side segment arch rib, front No. 3 left side segment arch rib, front No. 4 left side segment arch rib, front No. 5 left side segment arch rib, front No. 6 left side segment arch rib, closure section left side arch rib, back No. 6 left side segment arch rib, back No. 5 left side segment arch rib, back No. 4 left side segment arch rib, back No. 3 left side segment arch rib, back No. 2 left side segment arch rib, back No. 1 left side segment arch rib. The arch rib that is located the bridge floor right side is respectively from the front to the back: front No. 1 right side segment arch rib, front No. 2 right side segment arch rib, front No. 3 right side segment arch rib, front No. 4 right side segment arch rib, front No. 5 right side segment arch rib, front No. 6 right side segment arch rib, closing section right side arch rib, back No. 6 right side segment arch rib, back No. 5 right side segment arch rib, back No. 4 right side segment arch rib, back No. 3 right side segment arch rib, back No. 2 right side segment arch rib, and back No. 1 right side segment arch rib.
The below No. 1 segment arch rib refers to the front No. 1 right segment arch rib, the back No. 1 right segment arch rib, the front No. 1 left segment arch rib and the back No. 1 left segment arch rib; the No. 2 segment arch rib refers to the front No. 2 right segment arch rib, the back No. 2 right segment arch rib, the front No. 2 left segment arch rib, and the back No. 2 left segment arch rib … … 6 No. 6 segment arch rib refers to the front No. 6 right segment arch rib, the back No. 6 right segment arch rib, the front No. 6 left segment arch rib, and the back No. 6 left segment arch rib.
The construction steps are as follows: construction of arch feet and No. 1 segmental arch ribs → construction of a bridge deck girder and embedding of a lower anchor box → installation of a temporary support and the rest segmental arch ribs → concrete pouring → support dismantling → suspender installation → suspender tensioning → finish paint coating.
Firstly, constructing an arch springing and a No. 1 segment arch rib;
the four arch feet are constructed together with the continuous beam No. 0 block, and 2/3 lengths of the front No. 1 left segment arch rib, the front No. 1 right segment arch rib, the rear No. 1 left segment arch rib and the rear No. 1 right segment arch rib are respectively embedded in the four arch feet; and concrete is poured into the No. 1 section arch rib steel pipe, the concrete is jacked to the top surface of the arch springing, and the concrete surface is required to be perpendicular to the axis of the arch rib.
No. 1 segment arch rib erection process: transporting the member onto the bridge → hoisting the segments → positioning → connecting the matching pieces → precisely adjusting → fixing by spot welding (welding the code plates).
After the No. 1 arch rib is accurately positioned, the No. 1 arch rib and the temporary support are firmly welded, and two I20a I-steel cross braces are welded on a side web plate of the No. 1 arch rib close to the center of the circuit.
In order to prevent No. 1 arch rib from being influenced by gravity and move backwards along the arch axis, a portal frame support is arranged at the lower opening of the arch tube under the arch rib. The portal frame is formed by welding I-shaped steel I20a, and in order to increase the rigidity of the I-shaped steel I20a cross beam, an I-shaped steel I20a upright post is welded at the fulcrum of the I-shaped steel and the lower arch pipe.
Constructing a bridge deck main beam, and pre-burying an anchor box at a corresponding position of the suspender;
the bridge deck girder construction adopts a symmetrical movable hanging basket cantilever pouring method, the bridge is closed in the midspan, and the anchor box is pre-buried at the corresponding position of the suspender when the girder is constructed.
Thirdly, installing the temporary support and the rest segment arch ribs:
the support adopts a form of a concrete pier and a truss column, the top of the column is provided with a sharing beam H400 multiplied by 200 multiplied by 8 multiplied by 10mm, the top of the sharing beam is closely attached to a steel beam by a lifting pad such as a steel plate, the main pipe of the truss column adopts a phi 219 multiplied by 10mm steel pipe, the support rod adopts a phi 159 multiplied by 8.0mm steel pipe, and the web member of the column adopts a phi 89 multiplied by 4 mm. The truss column steel pipe and the sharing beam are made of Q235B grade steel. And assembling the pipe truss in sections on site and then hoisting.
Temporary supports between a No. 1 segment arch rib and a No. 2 segment arch rib and between a No. 2 segment arch rib and a No. 3 segment arch rib are set up;
installing and temporarily fixing No. 2 segment arch ribs;
before hoisting, a wind rope is tied on a component, a steel pipe arch segment is hoisted to the upper space of a support and slowly lowered to the support, the lower opening of an arch rib of an installation section is aligned with the upper opening of the installed segment, an arc bracket on a temporary support platform is used for tightly propping the arch rib, so that the weight of the arch rib is transferred to the support, the butt joint part is firstly adjusted to be in butt joint with the arch rib installed at the lower end, a jack, a wedge and a chain block on the support are used for linear adjustment of the axis of the arch rib, a matching part bolt is firstly screwed, and the butt joint gap should not be larger than +/-2 mm. And (3) adjusting the upper arch rib, namely accurately adjusting the coordinate position of a control point of the arch rib port identification by using a total station according to the relation between a known reference point and a design axis, wherein the elevation and the axis are not more than +/-5 mm. After the adjustment is finished, the bolts are screwed, the arch ribs and the support are welded and fixed, and the two pairs of interfaces are welded firmly by using the code plates.
The installation sequence of No. 2 segment arch ribs is as follows: anterior No. 2 right side segmental rib → anterior No. 2 left side segmental rib → posterior No. 2 right side segmental rib → posterior No. 2 left side segmental rib.
Installing steel bars in the No. 2 segment arch rib, and simultaneously building a temporary support between the No. 3 segment arch rib and the No. 4 segment arch rib; and (4) manually entering the reinforcing steel bars in the arch rib from a reserved manhole on the arch rib to finish the reinforcing steel bar installation in the arch rib.
Installing and temporarily fixing No. 3 segment arch ribs; installing steel bars in the No. 3 segment arch rib, and simultaneously building a temporary support between the No. 4 segment arch rib and the No. 5 segment arch rib; be equipped with the stull on No. 3 segmental arch ribs, install earlier between No. 3 right side segmental arch ribs, the preceding No. 3 left side segmental arch ribs, after installation No. 3 right side segmental arch ribs, the order between No. 3 left side segmental arch ribs of back installation well stull, spot welding is fixed after the fine-tuning position.
The installation sequence of No. 3 segment arch rib and reinforcing steel bars in the segment arch rib is as follows: anterior No. 3 right side segmental arch → anterior No. 3 left side segmental arch → posterior No. 3 right side segmental arch → posterior No. 3 left side segmental arch.
Installing and temporarily fixing No. 4 segment arch ribs; installing reinforcing steel bars in the No. 4 segment arch rib, simultaneously building temporary supports between the No. 5 segment arch rib and the No. 6 segment arch rib, and connecting the upper parts of the temporary supports of the two arch ribs by using transverse supports after the temporary supports are built; be equipped with the stull on 4 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 4 preceding right side section arch ribs of installation, No. 4 preceding left side section arch intercostals stull, and the order installation of bracing is installed again to No. 4 right side section arch ribs of back installation, No. 4 back left side section intercostals stull, and spot welding is fixed after the fine tuning position.
The installation sequence of No. 4 segment arch rib and steel bars in the segment arch rib is as follows: anterior No. 4 right side segmental rib → anterior No. 4 left side segmental rib → posterior No. 4 right side segmental rib → posterior No. 4 left side segmental rib.
Installing and temporarily fixing No. 5 segment arch ribs; installing steel bars in arch ribs of No. 5 sections, simultaneously erecting temporary supports of closure sections, and connecting the upper parts of the temporary supports of the closure sections of the two arch ribs by using transverse supports after the temporary supports of the closure sections are erected; be equipped with the stull on No. 5 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 5 right side section arch ribs before installing earlier, No. 5 left side section arch ribs crossbearers, and the order installation of bracing is installed again to No. 5 right side section arch ribs after the back installation, No. 5 left side section arch ribs after the back crossbearers, and spot welding is fixed after the fine tuning position.
No. 5 segment arch rib and the installation sequence of the steel bars in the segment arch rib are as follows: anterior No. 5 right side segmental arch → anterior No. 5 left side segmental arch → posterior No. 5 right side segmental arch → posterior No. 5 left side segmental arch.
Installing and temporarily fixing No. 6 segment arch ribs; installing a steel bar in the arch rib of the No. 6 segment; be equipped with the stull on No. 6 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 6 right side section arch ribs before installing earlier, No. 6 left side section arch ribs crossbearers, and the order installation of bracing is installed again to No. 6 right side section arch ribs after the back installation, No. 6 left side section arch ribs after the back crossbearers, and spot welding is fixed after the fine tuning position.
No. 6 segment arch rib and the installation order of reinforcing bar in the segment arch rib do: anterior No. 6 right side segmental arch → anterior No. 6 left side segmental arch → posterior No. 6 right side segmental arch → posterior No. 6 left side segmental arch.
And (3) installing the closure section arch rib, wherein the closure section installation is carried out according to the sequence of closing the right side arch rib of the closure section firstly and closing the left side arch rib of the closure section secondly, and the closure section arch rib is temporarily fixed, so that workers enter the closure section arch rib from a manhole to install the steel bars in the arch rib.
The No. 1 segment arch rib and the No. 2 segment arch rib are fixed by indirect seam welding; the No. 3 segment arch rib and the No. 4 segment arch rib are fixed by indirect seam welding; the No. 5 segment arch rib and the No. 6 segment arch rib are fixed by indirect seam welding; the No. 2 segment arch rib and the No. 3 segment arch rib are fixed by indirect seam welding; the No. 4 segment arch rib and the No. 5 segment arch rib are fixed by indirect seam welding; the closure section and the No. 6 section are fixed by indirect seam welding;
the welding sequence of the cross brace and the inclined brace is carried out according to the sequence of No. 3 cross brace, No. 4 inclined brace, No. 5 cross brace, No. 5 inclined brace, No. 6 cross brace and No. 6 inclined brace.
Fourthly, pouring concrete into the arch rib;
and after all on-site welding line tests are qualified, the arch rib concrete can be poured.
And (3) arranging a pouring hole and a grout outlet at corresponding positions of the arch pipe and the web, jacking the poured arch pipe and the web concrete by using a high-pressure delivery pump, wherein the concrete pouring sequence is that the arch pipe is firstly poured, then the arch pipe is downwards poured and then the web is poured, and the pouring is symmetrically carried out from the arch foot to the arch crown. The two side ribs and the web plates can be symmetrically poured at the same time.
C55 micro-expansion concrete is poured into the pipe.
The arch rib concrete adopts a high-pressure pumping method for jacking from a low position to a high position, and impurities in the pipe are cleaned before jacking. The filling of one arch pipe at a time, both sides are symmetrically and simultaneously carried out, the filling is carried out from an arch foot (provided with a filling hole) to a vault (provided with an exhaust hole), and enough pumping pressure is required. The pumping process should be completed by one pumping within the initial setting time of the concrete. In order to prevent the concrete in the pipe from generating gaps, a proper number of attached vibrators can be arranged on the steel pipe, and the vibration is carried out while pouring, so that the air is discharged, and the compactness of the concrete can be enhanced. After the concrete is poured, the pouring hole and the exhaust hole are closed, after certain strength is achieved, the compactness of the arch rib concrete is detected, a detection method combining manual knocking and ultrasonic waves is adopted, and the detection time is preferably 28 days after pouring and before acceptance. The gentle section of vault can be every 5m at intervals about open a diameter exhaust hole of 30mm, and the exhaust hole car is threaded to the bolt head that matches with it is prepared, in order in time shutoff exhaust hole during the jacking, the exhaust hole should in time seal welding after concrete compactness detects and accomplishes.
Fifthly, removing the temporary support;
and after the arch rib is integrally installed and concrete is poured, and the strength of the concrete meets the requirements specified by the specification, the temporary support is dismantled.
The temporary supports are removed in the sequence from the arch springing at two sides to the arch crown, and the temporary supports of two arch ribs can be removed simultaneously.
Sixthly, mounting a suspender;
and after the arch rib closure is finished and the arch rib concrete is poured, the hanger rod can be installed and constructed. Before the suspender is installed, steel bars are used for manufacturing hole detectors with the same size according to the designed diameter of the suspender strictly, hole detection measurement is carried out on a suspender hole pre-buried in a bridge deck, if the hole detectors cannot freely slide up and down in the suspender hole, the problem that the diameter of the suspender hole is too small or the suspender hole is deformed is solved, and the suspender hole finishing treatment is carried out at the moment so as to meet the requirement of penetrating the suspender. After the sizes and the positions of all the hanger rod holes are ensured to be correct, the hanger rod can be installed. In addition, a hoisting device for hoisting the suspender needs to be processed in advance, and one end of the hoisting device can be connected with the upper end of the suspender through a threaded opening.
Before the suspender is installed, the suspender which is numbered in advance is sequentially hung at a preset position of a bridge deck to be placed, a winch is utilized to put down a hoisting steel wire rope from a suspender orifice at an arch pipe on a steel pipe arch, the steel wire rope penetrates through the suspender orifice of the arch pipe to the bridge deck, a first suspender is installed on a hoisting device, the winch is started to slowly hoist, the hoisting suspender is lifted through the suspender hanger hole of the arch pipe of the steel pipe arch to enable the suspender to be 10cm away from the bridge deck, then the suspender is put through a bridge deck hanger hole, the upper end of the suspender and an upper anchor box are connected at the arch pipe, and finally the lower end of the suspender is connected with a lower anchor box at the suspender position of the bridge deck, so that the installation operation of the first suspender is completed. All booms can then be mounted in turn in the same way.
Seventhly, tensioning the suspender;
after the installation of the suspension rods is finished, the suspension rods can be tensioned after the strength of the arch rib poured concrete reaches 90%, and the tensioning of the suspension rods is carried out at intervals, namely according to the sequence of 1 → 3 → 5 → 7 → 2 → 4 → 6 → 8. The boom tensioning of two arch ribs can be carried out simultaneously or can be completed by tensioning one arch rib and then tensioning the other arch rib. After the initial tension is added to the suspender, the suspender needs to be adjusted for a plurality of times so as to reach the target value of the cable force of the suspender. And finally, after the bridge surface waterproof layer, the sidewalk, the line equipment and other bridge surface systems are completely paved, tensioning the suspender in the final stage to adjust the suspender force to the designed cable force target value.
Eighthly, coating finish paint of the steel structure;
the outer surfaces of the steel pipe arch, the cross brace, the diagonal brace and the suspender adopt a fluorocarbon coating matching system, the bottom layer is epoxy zinc-rich antirust paint (2, 40 um/way), the middle layer is micaceous iron epoxy intermediate paint (1, 40 um/way), the surface layer is fluorocarbon coating finish paint (2, 35 um/way), and the steel structure embedded in the arch springing concrete is not coated with finish paint.
The invention has the advantages that: according to the construction method, the arch rib is installed and constructed in a flowing water manner, the construction speed is high, and the construction progress is easy to control; the installation is carried out symmetrically and sectionally, so that the accuracy of the arch line is ensured, and the engineering quality is ensured; the temporary support is not assembled in place at one time but is assembled along with the installation progress, the operation space on the bridge is sufficient, and the construction safety is easy to ensure; the personnel's operation is gone on in groups, does not tie up labours, practices thrift manpower resources.
Description of the drawings:
FIG. 1 is a front view of a bowstring arch bridge of the present invention; in the figure, 1 is the front 1 left side segment arch rib, 2 is the front 2 left side segment arch rib, 3 is the front 3 left side segment arch rib, 4 is the front 4 left side segment arch rib, 5 is the front 5 left side segment arch rib, 6 is the front 6 left side segment arch rib, 7 is the closure segment left side arch rib, 8 is the rear 6 left side segment arch rib, 9 is the rear 5 left side segment arch rib, 10 is the rear 4 left side segment arch rib, 11 is the rear 3 left side segment arch rib, 12 is the rear 2 left side segment arch rib, 13 is the rear 1 left side segment arch rib, 14 is the arch foot, 15 is the suspender, 16 is the lower anchor box, 17 is the pier, 18 is the continuous beam, 19 is the continuous beam No. 0 block.
FIG. 2 is a schematic top view of a bowstring arch bridge of the present invention; in the figure, 1 is the front No. 1 left side segment arch rib, 2 is the front No. 2 left side segment arch rib, 3 is the front No. 3 left side segment arch rib, 4 is the front No. 4 left side segment arch rib, 5 is the front No. 5 left side segment arch rib, 6 is the front No. 6 left side segment arch rib, 7 is the closure segment left side arch rib, 8 is the rear No. 6 left side segment arch rib, 9 is the rear No. 5 left side segment arch rib, 10 is the rear No. 4 left side segment arch rib, 11 is the rear No. 3 left side segment arch rib, 12 is the rear No. 2 left side segment arch rib, 13 is the rear No. 1 left side segment arch rib, 14 is the arch foot; 20 is the front No. 1 right-side segment arch rib, 21 is the front No. 2 right-side segment arch rib, 22 is the front No. 3 right-side segment arch rib, 23 is the front No. 4 right-side segment arch rib, 24 is the front No. 5 right-side segment arch rib, 25 is the front No. 6 right-side segment arch rib, 26 is the closure segment right-side arch rib, 27 is the rear No. 6 right-side segment arch rib, 28 is the rear No. 5 right-side segment arch rib, 29 is the rear No. 4 right-side segment arch rib, 30 is the rear No. 3 right-side segment arch rib, 31 is the rear No. 2 right-side segment arch rib, and 32 is the rear No. 1 right-side segment arch rib.
FIG. 3 is a schematic front view of a bowstring arch bridge with the installed arch rib and the bracket removed; in the figure, 1 is the front 1 left-side segment arch rib, 2 is the front 2 left-side segment arch rib, 3 is the front 3 left-side segment arch rib, 4 is the front 4 left-side segment arch rib, 5 is the front 5 left-side segment arch rib, 6 is the front 6 left-side segment arch rib, 7 is the closure segment left-side arch rib, 8 is the rear 6 left-side segment arch rib, 9 is the rear 5 left-side segment arch rib, 10 is the rear 4 left-side segment arch rib, 11 is the rear 3 left-side segment arch rib, 12 is the rear 2 left-side segment arch rib, 13 is the rear 1 left-side segment arch rib, 14 is the arch foot, 17 is the pier, 18 is the continuous beam, 19 is the continuous beam block No. 0, and 33 is the temporary support.
The specific implementation mode is as follows:
the invention is further illustrated with reference to fig. 1-3;
the arch ribs of the tied arch bridge adopt vertical parallel arches, and the arch ribs on the left side of the bridge floor are respectively as follows from front to back: front No. 1 left side segment arch rib, front No. 2 left side segment arch rib, front No. 3 left side segment arch rib, front No. 4 left side segment arch rib, front No. 5 left side segment arch rib, front No. 6 left side segment arch rib, closure section left side arch rib, back No. 6 left side segment arch rib, back No. 5 left side segment arch rib, back No. 4 left side segment arch rib, back No. 3 left side segment arch rib, back No. 2 left side segment arch rib, back No. 1 left side segment arch rib. The arch rib that is located the bridge floor right side is respectively from the front to the back: front No. 1 right side segment arch rib, front No. 2 right side segment arch rib, front No. 3 right side segment arch rib, front No. 4 right side segment arch rib, front No. 5 right side segment arch rib, front No. 6 right side segment arch rib, closing section right side arch rib, back No. 6 right side segment arch rib, back No. 5 right side segment arch rib, back No. 4 right side segment arch rib, back No. 3 right side segment arch rib, back No. 2 right side segment arch rib, and back No. 1 right side segment arch rib.
The below No. 1 segment arch rib refers to the front No. 1 right segment arch rib, the back No. 1 right segment arch rib, the front No. 1 left segment arch rib and the back No. 1 left segment arch rib; the No. 2 segment arch rib refers to the front No. 2 right segment arch rib, the back No. 2 right segment arch rib, the front No. 2 left segment arch rib, and the back No. 2 left segment arch rib … … 6 No. 6 segment arch rib refers to the front No. 6 right segment arch rib, the back No. 6 right segment arch rib, the front No. 6 left segment arch rib, and the back No. 6 left segment arch rib.
The construction steps are as follows: construction of arch feet and No. 1 segmental arch ribs → construction of a bridge deck girder and embedding of a lower anchor box → installation of a temporary support and the rest segmental arch ribs → concrete pouring → support dismantling → suspender installation → suspender tensioning → finish paint coating.
Firstly, constructing an arch springing and a No. 1 segment arch rib;
the four arch feet are constructed together with the continuous beam No. 0 block, and 2/3 lengths of the front No. 1 left segment arch rib, the front No. 1 right segment arch rib, the rear No. 1 left segment arch rib and the rear No. 1 right segment arch rib are respectively embedded in the four arch feet; and concrete is poured into the No. 1 section arch rib steel pipe, the concrete is jacked to the top surface of the arch springing, and the concrete surface is required to be perpendicular to the axis of the arch rib.
No. 1 segment arch rib erection process: transporting the member onto the bridge → hoisting the segments → positioning → connecting the matching pieces → precisely adjusting → fixing by spot welding (welding the code plates).
After the No. 1 arch rib is accurately positioned, the No. 1 arch rib and the temporary arch springing bracket are firmly welded, and two I20a I-steel cross braces are welded on a side web plate of the No. 1 arch rib close to the center of the circuit.
In order to prevent No. 1 arch rib from being influenced by gravity and move backwards along the arch axis, a portal frame support is arranged at the lower opening of the arch tube under the arch rib. The portal frame is formed by welding I-shaped steel I20a, and in order to increase the rigidity of the I-shaped steel I20a cross beam, an I-shaped steel I20a upright post is welded at the fulcrum of the I-shaped steel and the lower arch pipe.
Constructing a bridge deck main beam, and pre-burying an anchor box at a corresponding position of the suspender;
the bridge deck girder construction adopts a symmetrical movable hanging basket cantilever pouring method, the bridge is closed in the midspan, and the anchor box is pre-buried at the corresponding position of the suspender when the girder is constructed.
Thirdly, installing the temporary support and the rest segment arch ribs:
the support adopts a form of a concrete pier and a truss column, the top of the column is provided with a sharing beam H400 multiplied by 200 multiplied by 8 multiplied by 10mm, the top of the sharing beam is closely attached to a steel beam by a lifting pad such as a steel plate, the main pipe of the truss column adopts a phi 219 multiplied by 10mm steel pipe, the support rod adopts a phi 159 multiplied by 8.0mm steel pipe, and the web member of the column adopts a phi 89 multiplied by 4 mm. The truss column steel pipe and the sharing beam are made of Q235B grade steel. And assembling the pipe truss in sections on site and then hoisting.
Temporary supports between a No. 1 segment arch rib and a No. 2 segment arch rib and between a No. 2 segment arch rib and a No. 3 segment arch rib are set up;
installing and temporarily fixing No. 2 segment arch ribs;
before hoisting, a wind rope is tied on a component, a steel pipe arch segment is hoisted to the upper space of a support and slowly lowered to the support, the lower opening of an arch rib of an installation section is aligned with the upper opening of the installed segment, an arc bracket on a temporary support platform is used for tightly propping the arch rib, so that the weight of the arch rib is transferred to the support, the butt joint part is firstly adjusted to be in butt joint with the arch rib installed at the lower end, a jack, a wedge and a chain block on the support are used for linear adjustment of the axis of the arch rib, a matching part bolt is firstly screwed, and the butt joint gap should not be larger than +/-2 mm. And (3) adjusting the upper arch rib, namely accurately adjusting the coordinate position of a control point of the arch rib port identification by using a total station according to the relation between a known reference point and a design axis, wherein the elevation and the axis are not more than +/-5 mm. After the adjustment is finished, the bolts are screwed, the arch ribs and the support are welded and fixed, and the two pairs of interfaces are welded firmly by using the code plates.
The installation sequence of No. 2 segment arch ribs is as follows: anterior No. 2 right side segmental rib → anterior No. 2 left side segmental rib → posterior No. 2 right side segmental rib → posterior No. 2 left side segmental rib.
Installing steel bars in the No. 2 segment arch rib, and simultaneously building a temporary support between the No. 3 segment arch rib and the No. 4 segment arch rib; and (4) manually entering the reinforcing steel bars in the arch rib from a reserved manhole on the arch rib to finish the reinforcing steel bar installation in the arch rib.
Installing and temporarily fixing No. 3 segment arch ribs; installing steel bars in the No. 3 segment arch rib, and simultaneously building a temporary support between the No. 4 segment arch rib and the No. 5 segment arch rib; be equipped with the stull on No. 3 segmental arch ribs, install earlier between No. 3 right side segmental arch ribs, the preceding No. 3 left side segmental arch ribs, after installation No. 3 right side segmental arch ribs, the order between No. 3 left side segmental arch ribs of back installation well stull, spot welding is fixed after the fine-tuning position.
The installation sequence of No. 3 segment arch rib and reinforcing steel bars in the segment arch rib is as follows: anterior No. 3 right side segmental arch → anterior No. 3 left side segmental arch → posterior No. 3 right side segmental arch → posterior No. 3 left side segmental arch.
Installing and temporarily fixing No. 4 segment arch ribs; installing reinforcing steel bars in the No. 4 segment arch rib, simultaneously building temporary supports between the No. 5 segment arch rib and the No. 6 segment arch rib, and connecting the upper parts of the temporary supports of the two arch ribs by using transverse supports after the temporary supports are built; be equipped with the stull on 4 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 4 preceding right side section arch ribs of installation, No. 4 preceding left side section arch intercostals stull, and the order installation of bracing is installed again to No. 4 right side section arch ribs of back installation, No. 4 back left side section intercostals stull, and spot welding is fixed after the fine tuning position.
The installation sequence of No. 4 segment arch rib and steel bars in the segment arch rib is as follows: anterior No. 4 right side segmental rib → anterior No. 4 left side segmental rib → posterior No. 4 right side segmental rib → posterior No. 4 left side segmental rib.
Installing and temporarily fixing No. 5 segment arch ribs; installing steel bars in arch ribs of No. 5 sections, simultaneously erecting temporary supports of closure sections, and connecting the upper parts of the temporary supports of the closure sections of the two arch ribs by using transverse supports after the temporary supports of the closure sections are erected; be equipped with the stull on No. 5 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 5 right side section arch ribs before installing earlier, No. 5 left side section arch ribs crossbearers, and the order installation of bracing is installed again to No. 5 right side section arch ribs after the back installation, No. 5 left side section arch ribs after the back crossbearers, and spot welding is fixed after the fine tuning position.
No. 5 segment arch rib and the installation sequence of the steel bars in the segment arch rib are as follows: anterior No. 5 right side segmental arch → anterior No. 5 left side segmental arch → posterior No. 5 right side segmental arch → posterior No. 5 left side segmental arch.
Installing and temporarily fixing No. 6 segment arch ribs; installing a steel bar in the arch rib of the No. 6 segment; be equipped with the stull on No. 6 sections, also be equipped with the bracing simultaneously, install the bracing again according to No. 6 right side section arch ribs before installing earlier, No. 6 left side section arch ribs crossbearers, and the order installation of bracing is installed again to No. 6 right side section arch ribs after the back installation, No. 6 left side section arch ribs after the back crossbearers, and spot welding is fixed after the fine tuning position.
No. 6 segment arch rib and the installation order of reinforcing bar in the segment arch rib do: anterior No. 6 right side segmental arch → anterior No. 6 left side segmental arch → posterior No. 6 right side segmental arch → posterior No. 6 left side segmental arch.
And (3) installing the closure section arch rib, wherein the closure section installation is carried out according to the sequence of closing the right side arch rib of the closure section firstly and closing the left side arch rib of the closure section secondly, and the closure section arch rib is temporarily fixed, so that workers enter the closure section arch rib from a manhole to install the steel bars in the arch rib.
The No. 1 segment arch rib and the No. 2 segment arch rib are fixed by indirect seam welding; the No. 3 segment arch rib and the No. 4 segment arch rib are fixed by indirect seam welding; the No. 5 segment arch rib and the No. 6 segment arch rib are fixed by indirect seam welding; the No. 2 segment arch rib and the No. 3 segment arch rib are fixed by indirect seam welding; the No. 4 segment arch rib and the No. 5 segment arch rib are fixed by indirect seam welding; the closure section and the No. 6 section are fixed by indirect seam welding;
the welding sequence of the cross brace and the inclined brace is carried out according to the sequence of No. 3 cross brace, No. 4 inclined brace, No. 5 cross brace, No. 5 inclined brace, No. 6 cross brace and No. 6 inclined brace.
Fourthly, pouring concrete into the arch rib;
and after all on-site welding line tests are qualified, the arch rib concrete can be poured.
And (3) arranging a pouring hole and a grout outlet at corresponding positions of the arch pipe and the web, jacking the poured arch pipe and the web concrete by using a high-pressure delivery pump, wherein the concrete pouring sequence is that the arch pipe is firstly poured, then the arch pipe is downwards poured and then the web is poured, and the pouring is symmetrically carried out from the arch foot to the arch crown. The two side ribs and the web plates can be symmetrically poured at the same time.
C55 micro-expansion concrete is poured into the pipe.
The arch rib concrete adopts a high-pressure pumping method for jacking from a low position to a high position, and impurities in the pipe are cleaned before jacking. The filling of one arch pipe at a time, both sides are symmetrically and simultaneously carried out, the filling is carried out from an arch foot (provided with a filling hole) to a vault (provided with an exhaust hole), and enough pumping pressure is required. The pumping process should be completed by one pumping within the initial setting time of the concrete. In order to prevent the concrete in the pipe from generating gaps, a proper number of attached vibrators can be arranged on the steel pipe, and the vibration is carried out while pouring, so that the air is discharged, and the compactness of the concrete can be enhanced. After the concrete is poured, the pouring hole and the exhaust hole are closed, after certain strength is achieved, the compactness of the arch rib concrete is detected, a detection method combining manual knocking and ultrasonic waves is adopted, and the detection time is preferably 28 days after pouring and before acceptance. The gentle section of vault can be every 5m at intervals about open a diameter exhaust hole of 30mm, and the exhaust hole car is threaded to the bolt head that matches with it is prepared, in order in time shutoff exhaust hole during the jacking, the exhaust hole should in time seal welding after concrete compactness detects and accomplishes.
Fifthly, removing the temporary support;
and after the arch rib is integrally installed and concrete is poured, and the strength of the concrete meets the requirements specified by the specification, the temporary support is dismantled.
The temporary supports are removed in the sequence from the arch springing at two sides to the arch crown, and the temporary supports of two arch ribs can be removed simultaneously.
Sixthly, mounting a suspender;
and after the arch rib closure is finished and the arch rib concrete is poured, the hanger rod can be installed and constructed. Before the suspender is installed, steel bars are used for manufacturing hole detectors with the same size according to the designed diameter of the suspender strictly, hole detection measurement is carried out on a suspender hole pre-buried in a bridge deck, if the hole detectors cannot freely slide up and down in the suspender hole, the problem that the diameter of the suspender hole is too small or the suspender hole is deformed is solved, and the suspender hole finishing treatment is carried out at the moment so as to meet the requirement of penetrating the suspender. After the sizes and the positions of all the hanger rod holes are ensured to be correct, the hanger rod can be installed. In addition, a hoisting device for hoisting the suspender needs to be processed in advance, and one end of the hoisting device can be connected with the upper end of the suspender through a threaded opening.
Before the suspender is installed, the suspender which is numbered in advance is sequentially hung at a preset position of a bridge deck to be placed, a winch is utilized to put down a hoisting steel wire rope from a suspender orifice at an arch pipe on a steel pipe arch, the steel wire rope penetrates through the suspender orifice of the arch pipe to the bridge deck, a first suspender is installed on a hoisting device, the winch is started to slowly hoist, the hoisting suspender is lifted through the suspender hanger hole of the arch pipe of the steel pipe arch to enable the suspender to be 10cm away from the bridge deck, then the suspender is put through a bridge deck hanger hole, the upper end of the suspender and an upper anchor box are connected at the arch pipe, and finally the lower end of the suspender is connected with a lower anchor box at the suspender position of the bridge deck, so that the installation operation of the first suspender is completed. All booms can then be mounted in turn in the same way.
Seventhly, tensioning the suspender;
after the installation of the suspension rods is finished, the suspension rods can be tensioned after the strength of the arch rib poured concrete reaches 90%, and the tensioning of the suspension rods is carried out at intervals, namely according to the sequence of 1 → 3 → 5 → 7 → 2 → 4 → 6 → 8. The boom tensioning of two arch ribs can be carried out simultaneously or can be completed by tensioning one arch rib and then tensioning the other arch rib. After the initial tension is added to the suspender, the suspender needs to be adjusted for a plurality of times so as to reach the target value of the cable force of the suspender. And finally, after the bridge surface waterproof layer, the sidewalk, the line equipment and other bridge surface systems are completely paved, tensioning the suspender in the final stage to adjust the suspender force to the designed cable force target value.
Eighthly, coating finish paint of the steel structure;
the outer surfaces of the steel pipe arch, the cross brace, the diagonal brace and the suspender adopt a fluorocarbon coating matching system, the bottom layer is epoxy zinc-rich antirust paint (2, 40 um/way), the middle layer is micaceous iron epoxy intermediate paint (1, 40 um/way), the surface layer is fluorocarbon coating finish paint (2, 35 um/way), and the steel structure embedded in the arch springing concrete is not coated with finish paint.
Claims (1)
1. The construction method of the large-span steel pipe concrete tied arch bridge is characterized by comprising the following steps: the arch ribs of the tied arch bridge adopt vertical parallel arches, and the arch ribs on the left side of the bridge floor are respectively as follows from front to back: front No. 1 left side segment arch rib, front No. 2 left side segment arch rib, front No. 3 left side segment arch rib, front No. 4 left side segment arch rib, front No. 5 left side segment arch rib, front No. 6 left side segment arch rib, closing section left side arch rib, rear No. 6 left side segment arch rib, rear No. 5 left side segment arch rib, rear No. 4 left side segment arch rib, rear No. 3 left side segment arch rib, rear No. 2 left side segment arch rib, and rear No. 1 left side segment arch rib; the arch rib that is located the bridge floor right side is respectively from the front to the back: front No. 1 right side segment arch rib, front No. 2 right side segment arch rib, front No. 3 right side segment arch rib, front No. 4 right side segment arch rib, front No. 5 right side segment arch rib, front No. 6 right side segment arch rib, closing section right side arch rib, rear No. 6 right side segment arch rib, rear No. 5 right side segment arch rib, rear No. 4 right side segment arch rib, rear No. 3 right side segment arch rib, rear No. 2 right side segment arch rib, and rear No. 1 right side segment arch rib;
the construction steps are as follows: constructing an arch foot and a No. 1 segmental arch rib → constructing a bridge deck girder and embedding a lower anchor box → installing a temporary support and the rest segmental arch ribs → pouring concrete → dismantling the support → installing a suspender → tensioning the suspender → coating finish;
firstly, constructing an arch springing and a No. 1 segment arch rib;
the four arch feet are constructed together with the continuous beam No. 0 block, and 2/3 lengths of the front No. 1 left segment arch rib, the front No. 1 right segment arch rib, the rear No. 1 left segment arch rib and the rear No. 1 right segment arch rib are respectively embedded in the four arch feet; pouring concrete into the No. 1 section arch rib steel pipe, wherein the concrete is jacked to the top surface of the arch springing, and the concrete surface is required to be vertical to the axis of the arch rib;
no. 1 segment arch rib erection process: transporting the component to the bridge → hoisting the segment → positioning → connecting the matching pieces → precisely adjusting → fixing by spot welding;
after the No. 1 arch rib is accurately positioned, the No. 1 arch rib is firmly welded with the temporary support, and two I20a I-steel cross braces are welded on a side web plate of the No. 1 arch rib close to the center of the circuit;
a portal frame support is arranged at the lower opening of the lower arch tube of the arch rib; the portal frame is formed by welding I-shaped steel I20a, and in order to increase the rigidity of the I-shaped steel I20a cross beam, an I-shaped steel I20a upright post is welded at the fulcrum of the I-shaped steel and the lower arch pipe;
constructing a bridge deck main beam, and pre-burying an anchor box at a corresponding position of the suspender;
the bridge deck girder construction adopts a symmetrical movable hanging basket cantilever pouring method, closure is carried out in the midspan, and the lower anchor box is pre-buried in the corresponding position of the suspender while the girder construction is carried out;
thirdly, installing the temporary support and the rest segment arch ribs:
temporary supports between a No. 1 segment arch rib and a No. 2 segment arch rib and between a No. 2 segment arch rib and a No. 3 segment arch rib are set up;
installing and temporarily fixing No. 2 segment arch ribs;
before hoisting, tying a wind rope on a component, hoisting a steel pipe arch segment to the upper space of a support, slowly lowering the steel pipe arch segment onto the support, aligning the lower opening of an arch rib of an installation section with the upper opening of the installed segment, tightly jacking the arch rib by using an arc bracket on a temporary support platform, so that the weight of the arch rib is transferred onto the support, firstly adjusting the butt joint part to be in butt joint with the arch rib installed at the lower end, carrying out linear adjustment on the axis of the arch rib by using a jack, a wedge and a chain block on the support, and primarily screwing a bolt of a matching piece, wherein the gap of the butt joint is not more than +/-2 mm; adjusting the upper arch rib, namely accurately adjusting the coordinate position of a control point of an arch rib port identifier by using a total station according to the relation between a known reference point and a designed axis, wherein the elevation and the axis should not exceed +/-5 mm; after the adjustment is finished, the bolts are screwed, the arch ribs and the support are welded and fixed, and the two pairs of interfaces are welded firmly by using the code plates;
the installation sequence of No. 2 segment arch ribs is as follows: front No. 2 right side segment arch rib → front No. 2 left side segment arch rib → rear No. 2 right side segment arch rib → rear No. 2 left side segment arch rib;
installing steel bars in the No. 2 segment arch rib, and simultaneously building a temporary support between the No. 3 segment arch rib and the No. 4 segment arch rib; installing the reinforcing steel bars in the arch rib manually enters the arch rib from a reserved manhole on the arch rib, and installing the reinforcing steel bars in the arch rib;
installing and temporarily fixing No. 3 segment arch ribs; installing steel bars in the No. 3 segment arch rib, and simultaneously building a temporary support between the No. 4 segment arch rib and the No. 5 segment arch rib; the cross braces are arranged on the arch ribs of the No. 3 sections, the cross braces are arranged according to the sequence of firstly arranging the arch ribs of the No. 3 right sections and the arch ribs of the No. 3 left sections, then arranging the arch ribs of the No. 3 right sections and the arch ribs of the No. 3 left sections, and spot-welding and fixing after finely adjusting the positions;
the installation sequence of No. 3 segment arch rib and reinforcing steel bars in the segment arch rib is as follows: front No. 3 right side segment arch rib → front No. 3 left side segment arch rib → rear No. 3 right side segment arch rib → rear No. 3 left side segment arch rib;
installing and temporarily fixing No. 4 segment arch ribs; installing reinforcing steel bars in the No. 4 segment arch rib, simultaneously building temporary supports between the No. 5 segment arch rib and the No. 6 segment arch rib, and connecting the upper parts of the temporary supports of the two arch ribs by using transverse supports after the temporary supports are built; the No. 4 segment is provided with a transverse support and an inclined support, the inclined support is installed according to the sequence that the front No. 4 right segment arch rib is installed firstly, the transverse support between the front No. 4 left segment arch ribs is installed secondly, the rear No. 4 right segment arch rib is installed secondly, the transverse support between the rear No. 4 left segment arch ribs is installed secondly, and the inclined support is installed secondly after the position is finely adjusted;
the installation sequence of No. 4 segment arch rib and steel bars in the segment arch rib is as follows: front No. 4 right side segment arch rib → front No. 4 left side segment arch rib → rear No. 4 right side segment arch rib → rear No. 4 left side segment arch rib;
installing and temporarily fixing No. 5 segment arch ribs; installing steel bars in arch ribs of No. 5 sections, simultaneously erecting temporary supports of closure sections, and connecting the upper parts of the temporary supports of the closure sections of the two arch ribs by using transverse supports after the temporary supports of the closure sections are erected; the No. 5 segment is provided with a transverse support and an inclined support, the inclined support is installed according to the sequence that the front No. 5 right segment arch rib is installed firstly, the transverse support between the front No. 5 left segment arch ribs is installed secondly, the rear No. 5 right segment arch rib is installed secondly, the transverse support between the rear No. 5 left segment arch ribs is installed secondly, and the inclined support is installed secondly after the position is finely adjusted;
no. 5 segment arch rib and the installation sequence of the steel bars in the segment arch rib are as follows: front No. 5 right side segment arch rib → front No. 5 left side segment arch rib → rear No. 5 right side segment arch rib → rear No. 5 left side segment arch rib;
installing and temporarily fixing No. 6 segment arch ribs; installing a steel bar in the arch rib of the No. 6 segment; the No. 6 segment is provided with a transverse support and an inclined support, the inclined support is installed according to the sequence that the front No. 6 right segment arch rib is installed firstly, the transverse support between the front No. 6 left segment arch ribs is installed secondly, the rear No. 6 right segment arch rib is installed secondly, the transverse support between the rear No. 6 left segment arch ribs is installed secondly, and the inclined support is installed secondly after the position is finely adjusted;
no. 6 segment arch rib and the installation order of reinforcing bar in the segment arch rib do: front No. 6 right side segment arch rib → front No. 6 left side segment arch rib → rear No. 6 right side segment arch rib → rear No. 6 left side segment arch rib;
the method comprises the following steps that (1) arch ribs of a closure section are installed, the closure section is installed according to the sequence that the right arch rib of the closure section is closed firstly, then the left arch rib of the closure section is closed, the arch ribs are temporarily fixed, workers enter the arch ribs of the closure section from a manhole, and steel bars in the arch ribs are installed;
the No. 1 segment arch rib and the No. 2 segment arch rib are fixed by indirect seam welding; the No. 3 segment arch rib and the No. 4 segment arch rib are fixed by indirect seam welding; the No. 5 segment arch rib and the No. 6 segment arch rib are fixed by indirect seam welding; the No. 2 segment arch rib and the No. 3 segment arch rib are fixed by indirect seam welding; the No. 4 segment arch rib and the No. 5 segment arch rib are fixed by indirect seam welding; the closure section and the No. 6 section are fixed by indirect seam welding;
the welding sequence of the cross brace and the diagonal brace is carried out according to the sequence of No. 3 cross brace, No. 4 diagonal brace, No. 5 cross brace, No. 5 diagonal brace, No. 6 cross brace and No. 6 diagonal brace;
fourthly, pouring concrete into the arch rib;
after all on-site welding line tests are qualified, the arch rib concrete can be poured;
arranging a pouring hole and a grout outlet hole at corresponding positions of the arch pipe and the web, and lifting the poured arch pipe and the web concrete by using a high-pressure delivery pump, wherein the concrete pouring sequence is that the arch pipe is firstly lifted up, then the arch pipe is lifted down, and then the web is lifted up, and the pouring is symmetrically carried out from arch feet to arch tops during pouring; the arch ribs and the web plates on the two sides can be symmetrically poured at the same time;
the arch rib concrete adopts a high-pressure pumping jacking and pouring method from a low position to a high position, and impurities in the pipe are cleaned before jacking; pouring one arch pipe at a time, wherein two sides of the arch pipe are symmetrically and simultaneously poured, the pouring is carried out from an arch foot to an arch crown, and enough pump pressure is needed; the pumping process is to be carried out at one time within the initial setting time of the concrete; in order to prevent the concrete in the pipe from generating gaps, a proper number of attached vibrators can be arranged on the steel pipe, and the vibration is carried out while the steel pipe is poured, so that the air is discharged favorably, and the compactness of the concrete can be enhanced; after the concrete is poured, closing the pouring hole and the exhaust hole, and after a certain strength is reached, detecting the compactness of the arch rib concrete, wherein a detection method combining manual knocking and ultrasonic waves is adopted, and the detection time is preferably 28 days after pouring and before acceptance; the gentle section of the vault can be provided with vent holes with the diameter of 30mm at intervals of about 5m, the vent holes are turned into a thread shape, bolt heads matched with the vent holes are prepared, so that the vent holes can be plugged in time during jacking, and the vent holes are sealed and welded in time after concrete compactness detection is finished;
fifthly, removing the temporary support;
after the arch rib is integrally installed and concrete is poured, and the strength of the concrete meets the requirement specified by the specification, the temporary support is dismantled;
the temporary supports are dismantled in the sequence from the arch springing at two sides to the vault, and the temporary supports of two arch ribs can be dismantled simultaneously;
sixthly, mounting a suspender;
after the closure of the arch ribs is finished and the arch rib concrete is poured, the installation construction of the suspender can be carried out;
before the suspender is installed, the suspender which is numbered in advance is sequentially hoisted to a preset position of a bridge floor to be placed, a hoisting steel wire rope is put down from a suspender orifice at the position of an upper arch pipe of a steel pipe arch by using a winch, the steel wire rope penetrates through an orifice of the suspender orifice of the lower arch pipe to the bridge floor, a first suspender is installed with a hoist, the winch is started to hoist slowly, the suspender is lifted up by lifting the suspender through the suspender orifice of the arch pipe of the steel pipe arch, the suspender is separated from the bridge floor by 10cm and then is put down through a suspender orifice of the bridge floor, the upper end of the suspender is connected with an upper anchor box at the position of the upper arch pipe, and finally the lower end of the suspender is connected with a lower anchor box at the position of the suspender at the bridge floor to finish the installation operation of the first suspender; then all the hanging rods can be sequentially installed by adopting the same method;
seventhly, tensioning the suspender;
after the suspension rods are installed, tensioning the suspension rods after the strength of the arch rib poured concrete reaches 90%, wherein the tensioning of the suspension rods is carried out at intervals, namely according to the sequence of 1 → 3 → 5 → 7 → 2 → 4 → 6 → 8; the boom tensioning of the two arch ribs can be carried out simultaneously or one arch rib can be tensioned and the other arch rib can be tensioned; after the initial tension is applied to the suspender, the suspender needs to be adjusted for a plurality of times so as to reach the target value of the cable force of the suspender; finally, after the bridge deck waterproof layer, the sidewalk, the line equipment and other bridge deck systems are completely paved, the suspender can be tensioned in the final stage, and the force of the suspender is adjusted to a design cable force target value;
eighthly, coating finish paint of the steel structure;
the outer surfaces of the steel pipe arch, the cross brace, the diagonal brace and the hanger rod adopt a fluorocarbon coating matching system, the bottom layer is epoxy zinc-rich antirust paint, the middle layer is micaceous iron epoxy intermediate paint, the surface layer is fluorocarbon paint, and the steel structure embedded in the arch springing concrete is not coated with finish paint.
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| CN112359730B (en) * | 2020-10-26 | 2022-10-28 | 中铁三局集团有限公司 | Steel pipe arch installation method |
| CN114657862B (en) * | 2022-04-18 | 2024-06-18 | 安徽省公路桥梁工程有限公司 | Knocking device for arch rib structure of butterfly arch bridge |
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