CN109162209B - Quick replacement construction method for half-through type and through type arch bridge suspenders - Google Patents

Quick replacement construction method for half-through type and through type arch bridge suspenders Download PDF

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Publication number
CN109162209B
CN109162209B CN201811025150.2A CN201811025150A CN109162209B CN 109162209 B CN109162209 B CN 109162209B CN 201811025150 A CN201811025150 A CN 201811025150A CN 109162209 B CN109162209 B CN 109162209B
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suspender
tensioning
temporary
bridge
arch
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CN109162209A (en
Inventor
肖开军
罗小聪
吴志淋
杨文甫
张长利
李鸿彬
陈俊
易学锋
何嘉强
杜波
黄明海
戴春洋
成莉
朱燕萍
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Guangdong Heli Civil Engineering Ltd
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Guangdong Heli Civil Engineering Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D4/00Arch-type bridges

Abstract

The invention discloses a quick replacement construction method for half-through and through arch bridge suspenders, which comprises the following steps: installing an operation platform and preparing for measurement and monitoring; step two: installing a temporary sling system; step three: tensioning the temporary pocket hanging system, and cutting off the old hanging rod; step four: removing the old suspender; step five: installing and tensioning a new suspender to realize the replacement of the suspender; step six: and (5) removing the temporary pocket hanging system, and adjusting the cable force of the new hanging rod. The construction method can achieve the purpose of quickly replacing the old suspender under the condition of less investment of temporary suspenders, operators and machinery, and is particularly suitable for replacing suspenders of half-through arch bridges and half-through arch bridges anchored on arch ribs or cross beams in the early stage, and the construction method is higher in efficiency.

Description

Quick replacement construction method for half-through type and through type arch bridge suspenders
Technical Field
The invention relates to a method for replacing an arch bridge suspender, in particular to a construction method for quickly replacing half-through and half-through arch bridge suspenders.
Background
Because the suspender arch bridge has beautiful modeling and large crossing capability, the suspender arch bridge is generally built on urban roads and becomes a beautiful landscape of the city, the city image is improved, however, the urban roads have dense traffic flow and limited traffic lanes, the suspender arch bridge generally needs full-bridge sealing or partial lane sealing when being replaced, and the influence on the life of citizens is large. The general competent departments have strict requirements on the construction period in order to reduce the influence on the traffic.
The early half-through and half-through arch bridges anchor the suspender on the arch rib or the cross beam during design and construction, the anchoring form is based on the limitation of the technology at that time and the selection made for the short-term maintenance and replacement, can avoid the corrosion of the exposed suspender steel wire of the arch rib and the cross beam part, simultaneously make the suspender, the arch rib and the cross beam part form a unified rigid body, improve the integrity, increase the anchoring force of the suspender, the arch rib and the cross beam, however, the subsequent suspender replacement has more influencing factors, high technical requirements, complex construction process and great replacement difficulty, and causes low replacement efficiency, according to the technical characteristics of the suspender replacement at the current stage, if the suspender replacement progress is accelerated, only the mode of adding temporary suspenders, operating personnel and machinery is increased, which is a waste, and the simultaneous replacement of a plurality of suspenders can cause more complex structural stress, increasing the risk of boom replacement.
The main process for replacing the arch bridge suspender comprises the steps of installing an operation platform, preparing for measurement and monitoring, installing a temporary suspending system, tensioning the temporary suspending system, cutting off an old suspender, removing the old suspender, installing and tensioning a new suspender, removing the temporary suspending system, adjusting the cable force of the suspender and the like, wherein under the condition of not increasing the mechanical investment of the temporary suspender and operating personnel, the key node process for determining the replacing speed of the suspender is the removal of the upper anchoring section and the lower anchoring section of the old suspender which takes the longest time, the data statistics and analysis shows that the working hours for taking up the anchor head and taking down the anchor head of the suspender respectively account for 33.7 percent and 24.5 percent of the total working hours for replacing the suspender and account for 58.2 percent of the total working hours for replacing the suspender, the steel wires in the embedded steel pipes of the arch ribs and the lower anchoring sections of the beams and the embedded steel pipes are integrally fixed with cement mortar, the space between the embedded steel pipes and the steel wires is small, the time-consuming and the efficiency are eliminated by other modes, The friction shearing action among particles and between particles and pipe wall, etc. Because the steel pipe and the steel wire are homogeneous solid materials, under the condition of setting rated water pressure, the high-pressure water jet does not impact the steel wire in the embedded steel pipe, and only removes cement paste between the embedded steel pipe and the steel wire, so the high-pressure water jet does not damage other steel structures such as the steel wire, the steel pipe and the like. The technology of breaking the reinforced concrete by using the high-pressure water jet can adopt computer control equipment, and the breaking process is carried out under the program control, so that the construction is safer and more reliable.
Disclosure of Invention
The invention aims to provide a quick replacement construction method for suspenders of half-through and underslung arch bridges, which can achieve the aim of quickly replacing old suspenders under the condition of less investment of temporary suspenders, operators and machinery, is particularly suitable for replacing suspenders of half-through and underslung arch bridges anchored on arch ribs or cross beams in the early stage, and has higher efficiency.
The above object of the present invention is achieved by the following technical solutions: a quick replacement construction method for half-through and through arch bridge suspenders is characterized in that: the construction method comprises the following steps:
the method comprises the following steps: installing an operation platform and preparing for measurement and monitoring;
step two: installing a temporary sling system;
step three: tensioning the temporary pocket hanging system, and cutting off the old hanging rod;
step four: removing the old suspender;
step five: installing and tensioning a new suspender to realize the replacement of the suspender;
step six: and (5) removing the temporary pocket hanging system, and adjusting the cable force of the new hanging rod.
In the invention, the first step is to install an operation platform and prepare for measurement and monitoring, and the specific processing process is as follows:
(1) the two installed operation platforms are provided, one is the operation platform which is erected on the arch rib by using a frame pipe and is used for tensioning the suspender and can also be used for installing a new suspender, and the other is the operation platform which is arranged at the lower end of the suspender and is used for installing a lower anchor head and tensioning equipment by using a construction basket;
(2) and establishing a wire point control network, and measuring the space coordinates between an upper anchor backing plate and a lower anchor backing plate of each suspender and the bridge deck elevation by using the existing high-precision total station as the reference of high-speed control in construction.
In the second step, the temporary hanging system is installed, and the specific treatment process is as follows:
(1) transporting the temporary long suspender to the arch rib, penetrating the temporary long suspender from the anchoring point preformed holes on the four cantilever beam ends of the tensioning platform, penetrating one temporary long suspender through each preformed hole, and lengthening according to the actual length;
(2) installing a temporary hanging system on the bridge floor, wherein the temporary hanging system comprises a conversion beam, a longitudinal beam, a cross beam, a lower joist, an arch conversion beam and a jack, the longitudinal beam, the cross beam, the lower joist and the arch conversion beam are all original structures of an arch bridge, the conversion beam is horizontally arranged on the longitudinal beam, four jacks are installed at the conversion beam to stretch a temporary long suspender, then the lower joist is placed at the bottom of the bridge, and the lower joist is temporarily fixed by using a temporary short suspender hoist;
(3) and the temporary short suspender penetrates through the preformed holes of the transfer beam and the lower joist, and the lower joist is connected with the longitudinal beam and the cross beam of the arch bridge by adopting the temporary short suspender.
In the third step, the temporary pocket hanging system is tensioned, and the old hanging rod is cut off, and the specific treatment process is as follows:
(1) removing cement paste in the embedded steel pipe between the arch rib and the upper and lower anchoring sections of the cross beam by using high-pressure water jet to separate the embedded steel pipe from steel wires in the pipe;
(2) the constant-load internal force value of each suspender is obtained by monitoring the measurement of the cable force of the suspender, and the cable force of the original suspender is gradually transferred to the temporary long suspender by adopting the existing method of gradually loading and releasing the internal force;
(3) carrying out graded tension control on the force of the temporary suspender in the system conversion process: the graded tensioning control is respectively 0 → 20% → 40% → 60% → 80% → 100%, the old suspender steel wires are cut off according to the same cable force, the old suspender steel wires are cut off twice at the position 1.5m higher than the bridge deck, and the variation value of the bridge deck elevation is controlled within the range of +/-5 mm in the tensioning process of each grade.
In the invention, the old suspender is dismantled in the fourth step, and the specific treatment process is as follows:
after the old suspender is cut off, the upper anchor head and the lower anchor head of the arch bridge are directly taken out in a drawing mode, the drawing device is installed below the bridge floor, a hydraulic tensioning jack is used for providing driving force, a high-strength screw rod is used as a jack tensioning part, the high-strength screw rod is fixedly connected with the anchor head of the old suspender of the arch bridge through a connector, the hydraulic tensioning jack is used for drawing the steel wire or steel strand anchor head of the old suspender of the arch bridge in a whole bundle, the old suspender is removed after being drawn, and finally hole cleaning is carried out.
In the fifth step, the new hanger rod is installed and tensioned, and the specific treatment process is as follows:
(1) after cleaning the embedded steel pipe of the original suspender, and processing and repairing the anchor backing plate, installing a new suspender;
(2) installing suspender tensioning equipment, wherein the suspender tensioning equipment adopts the existing equipment and comprises a suspender tensioning connector, a tensioning supporting leg, a jack, a tensioning rod and a tensioning nut, and adjusting and centering;
(3) tensioning the new suspender according to the designed tension cable force value and elevation control, loading in a tensioning grading manner, and removing the cable force of the temporary suspender in a grading manner;
(4) and tensioning the new suspender to the designed tonnage, screwing the nut and the locking nut after the elevation is adjusted properly, and removing the suspender tensioning equipment.
In the sixth step, the temporary hanging system is dismantled, and the cable force of the new hanging rod is adjusted, and the concrete treatment process is as follows:
after the full-bridge new suspender is replaced, the temporary suspension system is detached, the full-bridge new suspender cable force and the bridge floor control point elevation are measured, whether the new suspender cable force and the bridge floor elevation reach the design requirement is determined through calculation and analysis, if deviation exists, the new suspender cable force is further adjusted to enable the new suspender cable force to reach the design requirement, and the cable force and the elevation are measured again after the full-bridge cable adjustment is finished and are stored as a construction record.
The construction method solves the problem that only temporary suspenders, operators and machinery can be added to accelerate the construction efficiency in the existing suspender replacement technology, avoids the increased danger caused by more complex structural stress due to simultaneous replacement of a plurality of suspenders, and avoids the potential quality safety hazard.
The construction method has the advantages of high construction speed, low construction risk and strong operability.
Compared with the prior art, the invention has the following remarkable effects:
(1) the invention utilizes the uniqueness of the high-pressure water jet to quickly remove the cement slurry with the calculated depth in the embedded steel pipe of the suspender, which is more than 10 times faster than the traditional method for removing the cement slurry in the embedded steel pipe and 5 times of the efficiency of the common scheme.
(2) According to the invention, after the force of the suspender is transferred to the pocket hoisting system, the upper and lower anchor heads adopt a hydraulic jack drawing mode to take out the old anchor head.
(3) The invention has the advantages of small change of the original stress state of the bridge structure, simple construction, small construction working surface, small influence on the traffic of the bridge during the replacement, no traffic interruption under reasonable arrangement, high construction speed and high efficiency.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic illustration of the operating platform of the present invention;
FIG. 2 is a schematic view of a temporary sling system of the present invention;
FIG. 3 is a schematic view of the boom cutting of the present invention;
FIG. 4 is a schematic view of the present invention with the original boom removed;
fig. 5 is a schematic view of the present invention with the new boom installed.
Description of the reference numerals
1. Old suspender 2 and arch rib
3. Operating platform 4, temporary long suspender
5. Temporary short suspender 6 and transfer beam
7. Lower joist 8, arch upper conversion beam
9. Jack 10, longeron
11. Cross beam 12, high pressure water jet
13. Pre-buried steel pipe 14 and cement paste
15. Steel wire 16 old hanger rod steel wire
17. Upper anchor head 18, lower anchor head
19. The drawing device 20, the new boom.
Detailed Description
As shown in fig. 1 to 5, the quick replacement construction method for the suspender of the half-through and through arch bridge of the invention comprises the following steps:
the method comprises the following steps: installing an operation platform and preparing for measurement and monitoring, wherein the specific treatment process is as follows:
(1) two operation platforms 3 are installed, one is an operation platform which is erected on the arch rib 2 by using a frame pipe, and the operation platform is mainly used for tensioning the suspension rod and can also be used for installing a new suspension rod 20. The other is that the lower end of the suspender is provided with a construction hanging basket as an operation platform for installation of a lower anchor head 18 and tensioning equipment by constructors;
(2) and establishing a wire point control network, and measuring the space coordinates between an upper anchor backing plate and a lower anchor backing plate of each suspender and the bridge deck elevation by using the existing high-precision total station as the reference of high-speed control in construction.
Step two, installing a temporary pocket hanging system, wherein the specific treatment process is as follows:
(1) transporting the temporary long suspender 4 to the arch rib 2, penetrating the temporary long suspender 4 from the preformed holes of the anchoring points at the four cantilever beam ends of the tensioning platform, penetrating one temporary long suspender 4 through each preformed hole, and lengthening according to the actual length;
(2) installing a temporary hanging system on the bridge floor, wherein the temporary hanging system comprises a conversion beam 6, a longitudinal beam 10, a cross beam 11, a lower supporting beam 7, an arch conversion beam 8 and jacks 9, the longitudinal beam 10, the cross beam 11, the lower supporting beam 7 and the arch conversion beam 8 are all original structures of an arch bridge, the conversion beam 6 is horizontally arranged on the longitudinal beam 10, four jacks 9 are installed at the conversion beam 6 in total to stretch and draw the temporary long suspender 4, then the lower supporting beam 7 is placed at the bottom of the beam, and the temporary short suspender calabash made of finish-rolled deformed steel bar is used for temporarily fixing the lower supporting beam 7;
(3) the temporary short suspension rods 5 penetrate through reserved holes of the transfer beam 6 and the lower joist 7, and the lower joist 7 is connected with the longitudinal beam 10 and the cross beam 11 of the arch bridge by adopting the temporary short suspension rods 5.
Step three, tensioning the temporary pocket hanging system, and cutting off the old hanging rod 1; the specific treatment process is as follows:
(1) the method comprises the following steps of clearing away cement paste in a pre-buried steel pipe 13 between an arch rib 2 and an upper anchoring section and a lower anchoring section of a cross beam by using a high-pressure water jet 12, screwing a high-pressure water jet spray gun around a suspender in a left-right mode by using the conventional equipment, and crushing and punching out the cement paste 14 in the pre-buried steel pipe 13 by using the impact force of the high-pressure water jet so that the pre-buried steel pipe 13 is separated from a steel;
(2) the constant-load internal force value of each suspender is obtained by monitoring the measurement of the cable force of the suspender, and the cable force of the original suspender is gradually transferred to the temporary long suspender 4 by adopting the existing method of gradually loading and releasing the internal force;
(3) carrying out graded tension control on the force of the temporary suspender in the system conversion process: the graded tensioning control is respectively 0 → 20% → 40% → 60% → 80% → 100%, the old suspender steel wires 16 are cut off according to the same cable force, the old suspender steel wires are cut off twice at the position of the bridge deck height of about 1.5m, and the variation value of the bridge deck elevation is controlled within the range of +/-5 mm in the tensioning process of each grade.
Step four, dismantling the old suspender 1, wherein the specific treatment process is as follows:
after the old suspender is cut off, the upper anchor head 17 and the lower anchor head 18 of the arch bridge are directly taken out in a drawing mode, the drawing device 19 is installed below the bridge floor, the drawing device 19 adopts the existing equipment and comprises a high-strength screw rod and a connector, a hydraulic tensioning jack 9 is used for providing driving force, the high-strength screw rod is used as a jack tensioning piece, the high-strength screw rod is fixedly connected with the anchor head of the old suspender of the arch bridge through the connector, the hydraulic tensioning jack is used for integrally drawing the anchor head of a steel wire or a steel strand of the old suspender of the arch bridge, the old suspender 1 is removed after being drawn, and finally hole cleaning is carried out.
Step five, installing and tensioning a new suspender 20 to realize the replacement of the suspender, wherein the specific treatment process is as follows:
(1) after the original hanger rod embedded steel pipe 13 is cleaned, and the anchor backing plate is processed and repaired, a new hanger rod 20 is installed;
(2) installing suspender tensioning equipment, wherein the suspender tensioning equipment adopts the existing equipment and comprises a suspender tensioning connector, a tensioning supporting leg, a jack, a tensioning rod and a tensioning nut, and adjusting and centering;
(3) tensioning the new suspender 20 according to the designed tension cable force value and elevation control, loading in a tensioning grading manner, and removing the cable force of the temporary suspender in a grading manner;
(4) and tensioning the new suspender 20 to the designed tonnage, screwing the nut and the locknut after the elevation is adjusted properly, and removing the suspender tensioning equipment.
Step six, dismantling the temporary pocket hanging system, adjusting the cable force of the new hanging rod, and performing the following specific treatment process:
after the full-bridge new suspender 20 is replaced, the temporary suspension system is detached, the full-bridge new suspender cable force and the bridge floor control point elevation are measured, whether the new suspender cable force and the bridge floor elevation meet the design requirement is determined through calculation and analysis, and if the deviation exists, the new suspender cable force needs to be further adjusted to enable the new suspender cable force to meet the design requirement.
The specific method for adjusting the rope force of the hanger rod is similar to the method for tensioning the hanger rod. And measuring the cable force and the elevation once again after the full-bridge cable adjustment is finished, and storing the measured cable force and the elevation as a construction record.
The quick replacement construction method for the suspender of the half-through and through arch bridge solves the problems that only temporary suspenders, operators and machinery can be added in order to accelerate the construction efficiency in the existing suspender replacement technology, avoids the increased danger caused by more complex structural stress due to the simultaneous replacement of a plurality of suspenders, and puts an end to the potential safety hazard of quality.
The construction method has the advantages of high construction speed, low construction risk and strong operability.
Examples of the applications
Engineering example 1
The old bridge of the high-altitude bridge is built in 1989, the bridge site is located on the wide altitude S113 of the provincial road, the bridge spans the west river in the east-west direction, the old bridge belongs to a super-large bridge on the main flow of the west river, is a traffic main road for external traffic transportation in the high-altitude area, the total length of the bridge is 1092.1m, the two-way 4-lane road has the span combination of (78.5+4 × 82.6) a top-supported reinforced concrete rib arch bridge + (2 × 110) a middle-supported steel pipe concrete suspender arch bridge + (5 × 79+68.2) m top-supported reinforced concrete rib arch bridge, the total width of the bridge floor is 13.35m, and the reinforced concrete bridge floor is formed by combining the bridge. The west river channel at the high-light bridge is an inland river I-level channel, 3000t seagoing vessels pass through, the clear height of navigation is 22m, and the maximum navigation water level is designed to be 8.01m (bead base). The number of the full-bridge hanger rods is 36, the specification of the old hanger rods is 5-109 steel wires, the strength of the steel wires is 1600Mpa, and the breaking force is 349.2 t. According to the conventional test report in 2011, the cable force of the 5# boom at the downstream side of the 6 th hole is changed by 6.23t compared with the cable force of the last test, and the change range is 11%. Meanwhile, the majority of the hanging rods basically reach the service life, so that all the hanging rods are replaced. In 2016, 2 months, 2 experiments adopt the construction method, in the whole process of replacing the suspender, the stress state of the bridge structure is controlled within an allowable range, the whole bridge structure is not newly damaged, and the efficiency is 5 times that of the common construction method.
Engineering example 2
A Fushan city Flochen bridge is built into a general vehicle in 1994, the bridge is 883.84m long, and the main span is 115.80 m. The bridge span combination is: (15 x 16) m prestressed hollow slab + (3 x 28.3) m reinforced concrete continuous beam +112.8m through concrete filled steel tube tie bar arch + (3 x 28.3) m reinforced concrete continuous beam + (18 x 16) m prestressed hollow slab, and the total span is 40. 42 suspenders are arranged on two ribs of the main bridge at the interval of 5 m. The hanger rods are all made of SNS/S-85 multiplied by 7mm galvanized steel wires and extruded with double-sheath twisted-pattern finished inhaul cables, the upper ends of the hanger rods are anchored on the inner anchor plates of the arch rib upper tubes by adopting LZM85IJ-7 type cold-cast heading anchors, and the lower ends of the hanger rods are anchored in the cross beams by adopting self-designed heading anchors. In 2017, in 4 months, 6 experiments are carried out by adopting the construction method, in the whole suspender replacement process, the stress state of the bridge structure is controlled within an allowable range, the whole bridge structure is not newly damaged, and the efficiency is 5 times that of the common construction method.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.

Claims (5)

1. A quick replacement construction method for half-through and through arch bridge suspenders is characterized in that: the construction method comprises the following steps:
the method comprises the following steps: installing an operation platform and preparing for measurement and monitoring;
step two: installing a temporary sling system; step two, installing a temporary pocket hanging system, wherein the specific treatment process is as follows:
(1) transporting the temporary long suspender to the arch rib, penetrating the temporary long suspender from the anchoring point preformed holes on the four cantilever beam ends of the tensioning platform, penetrating one temporary long suspender through each preformed hole, and lengthening according to the actual length;
(2) installing a temporary hanging system on the bridge floor, wherein the temporary hanging system comprises a conversion beam, a longitudinal beam, a cross beam, a lower joist, an arch conversion beam and a jack, the longitudinal beam, the cross beam, the lower joist and the arch conversion beam are all original structures of an arch bridge, the conversion beam is horizontally arranged on the longitudinal beam, four jacks are installed at the conversion beam to stretch a temporary long suspender, then the lower joist is placed at the bottom of the bridge, and the lower joist is temporarily fixed by using a temporary short suspender hoist;
(3) penetrating a temporary short suspender through preformed holes of a transfer beam and a lower joist, and connecting the lower joist with a longitudinal beam and a cross beam of an arch bridge by adopting the temporary short suspender;
step three: tensioning the temporary pocket hanging system, and cutting off the old hanging rod; step three, tensioning the temporary pocket hoisting system, and cutting off the old hoisting rod, wherein the specific treatment process is as follows:
(1) removing cement paste in the embedded steel pipe between the arch rib and the upper and lower anchoring sections of the cross beam by using high-pressure water jet to separate the embedded steel pipe from steel wires in the pipe;
(2) the constant-load internal force value of each suspender is obtained by monitoring the measurement of the cable force of the suspender, and the cable force of the original suspender is gradually transferred to the temporary long suspender by adopting the existing method of gradually loading and releasing the internal force;
(3) carrying out graded tension control on the force of the temporary suspender in the system conversion process: the step tensioning control is respectively 0 → 20% → 40% → 60% → 80% → 100%, the old suspender steel wires are cut off according to the same cable force, the old suspender steel wires are cut off twice at the position 1.5m higher than the bridge deck, and the variation value of the bridge deck elevation is controlled within the range of +/-5 mm in the tensioning process of each step;
step four: removing the old suspender;
step five: installing and tensioning a new suspender to realize the replacement of the suspender;
step six: and (5) removing the temporary pocket hanging system, and adjusting the cable force of the new hanging rod.
2. The quick replacement construction method of the half-through and half-through arch bridge hanger bar according to claim 1, wherein: the method comprises the following steps of firstly, installing an operation platform and preparing for measurement and monitoring, wherein the specific processing process is as follows:
(1) the two installed operation platforms are provided, one is the operation platform which is erected on the arch rib by using a frame pipe and is used for tensioning the suspender and can also be used for installing a new suspender, and the other is the operation platform which is used for installing a lower anchor head and tensioning equipment by using a construction hanging basket at the lower end of the suspender;
(2) and establishing a wire point control network, and measuring the space coordinates between an upper anchor backing plate and a lower anchor backing plate of each suspender and the bridge deck elevation by using the existing high-precision total station as the reference of high-speed control in construction.
3. The quick replacement construction method of the half-through and half-through arch bridge hanger bar according to claim 2, wherein: and step four, dismantling the old suspender, wherein the specific treatment process is as follows:
after the old suspender is cut off, the upper anchor head and the lower anchor head of the arch bridge are directly taken out in a drawing mode, the drawing device is installed below the bridge floor, a hydraulic tensioning jack is used for providing driving force, a high-strength screw rod is used as a jack tensioning part, the high-strength screw rod is fixedly connected with the anchor head of the old suspender of the arch bridge through a connector, the hydraulic tensioning jack is used for drawing the steel wire or steel strand anchor head of the old suspender of the arch bridge in a whole bundle, the old suspender is removed after being drawn, and finally hole cleaning is carried out.
4. The quick replacement construction method of the half-through and half-through arch bridge hanger bar according to claim 3, wherein: and step five, installing and tensioning a new suspender, wherein the specific treatment process is as follows:
(1) after cleaning the embedded steel pipe of the original suspender, and processing and repairing the anchor backing plate, installing a new suspender;
(2) installing suspender tensioning equipment, wherein the suspender tensioning equipment adopts the existing equipment and comprises a suspender tensioning connector, a tensioning supporting leg, a jack, a tensioning rod and a tensioning nut, and adjusting and centering;
(3) tensioning the new suspender according to the designed tension cable force value and elevation control, loading in a tensioning grading manner, and removing the cable force of the temporary suspender in a grading manner;
(4) and tensioning the new suspender to the designed tonnage, screwing the nut and the locking nut after the elevation is adjusted properly, and removing the suspender tensioning equipment.
5. The quick-change construction method of the half-through and half-through arch bridge hanger rod according to claim 4, wherein: step six, dismantling the temporary pocket hanging system, adjusting the cable force of the new hanging rod, and performing the following specific treatment process:
after the full-bridge new suspender is replaced, the temporary suspension system is detached, the full-bridge new suspender cable force and the bridge floor control point elevation are measured, whether the new suspender cable force and the bridge floor elevation reach the design requirement is determined through calculation and analysis, if deviation exists, the new suspender cable force is further adjusted to enable the new suspender cable force to reach the design requirement, and the cable force and the elevation are measured again after the full-bridge cable adjustment is finished and are stored as a construction record.
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