CN114293480A - Comprehensive reinforcing structure for active hollow slab bridge and construction method - Google Patents
Comprehensive reinforcing structure for active hollow slab bridge and construction method Download PDFInfo
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- CN114293480A CN114293480A CN202111590412.1A CN202111590412A CN114293480A CN 114293480 A CN114293480 A CN 114293480A CN 202111590412 A CN202111590412 A CN 202111590412A CN 114293480 A CN114293480 A CN 114293480A
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- 238000010276 construction Methods 0.000 title claims abstract description 65
- 230000003014 reinforcing effect Effects 0.000 title claims description 20
- 239000004567 concrete Substances 0.000 claims abstract description 71
- 230000008439 repair process Effects 0.000 claims abstract description 26
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 25
- 238000012423 maintenance Methods 0.000 claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 239000004593 Epoxy Substances 0.000 claims abstract description 9
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 229920000742 Cotton Polymers 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000011384 asphalt concrete Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000004382 potting Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 3
- 238000004321 preservation Methods 0.000 description 17
- 238000009434 installation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
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Abstract
The invention relates to an active service hollow slab bridge comprehensive reinforcement structure and a construction method, which comprises the following steps: step one, construction preparation; step two, the capping beam is repaired and constructed; chiseling bridge deck concrete; fourthly, hinge joint repairing construction; step five, bridge deck repair construction; step six, performing low-temperature maintenance construction on the bridge deck concrete; and seventhly, grouting and repairing the crack at the bottom of the beam. The capping beam honeycomb pitted surface repair construction platform adopts self-hanging fixed chiseled modified epoxy concrete or polymer mortar repair construction platform, the hinge joint treatment adopts an integrally-formed conjoined door-shaped reinforcing steel bar and hinge joint reinforcing steel bar net positioning device, the bridge surface concrete heat insulation adopts a low-temperature environment movable easily-folded maintenance shed, and the beam bottom crack grouting repair adopts a multi-point synchronous filling and sealing device, so that the operation is simple, the construction speed is accelerated, and the labor is saved.
Description
Technical Field
The invention relates to an active service hollow slab bridge reinforcing system, in particular to an active service hollow slab bridge comprehensive reinforcing structure and a construction method.
Background
Along with the development of economy in China, more and more damages gradually appear on old bridges along with more and more old bridges, in order to ensure the operation safety of bridges, deep research is carried out on the reinforcement of cracks and the like of hinges, cover beams, bridge bottom plates and the like of existing-service hollow slab bridges, but the construction speed of an operation platform, the installation and positioning of hinge joint reinforcing steel bar nets, low-temperature maintenance and the like in the reinforcement process is low, the cost is high, the reinforcement quality is difficult to ensure, and the like.
In summary, it is very important to find a complex reinforcing structure for an existing hollow slab bridge and a construction method thereof, which have the advantages of high construction speed, fast installation of an operating platform, accurate installation and positioning of a hinge joint reinforcing mesh and repeated use, for the existing reinforcing system for the existing hollow slab bridge.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an active hollow slab bridge comprehensive reinforcement structure and a construction method.
The construction method of the comprehensive reinforcing structure of the active hollow slab bridge comprises the following steps:
step one, construction preparation: the related components of the comprehensive reinforcing structure of the existing hollow slab bridge are processed and manufactured in a centralized manner in a factory;
step two, bent cap repair construction: the capping beam repairing area adopts a self-hanging fixed chiseling modified epoxy concrete or polymer mortar repairing construction platform, the upper cross beam, the middle cross beam and the lower cross beam are connected through vertical beams at the sides close to the capping beams, the upper cross beam and the middle cross beam are fixed on the capping beams, and the middle cross beam is provided with an adjustable screw rod which is supported on a pier stud; workers carry out construction of the capping beam repairing area on the construction platform;
step three, chiseling bridge deck concrete: popping up an accurate reserved position by adopting an ink line, and cutting by using a concrete cutting machine; then crushing and chiseling the cutting positions at the east and west sides of the expansion joint by using a rock drill;
fourthly, hinge joint repairing construction: uniformly arranging door-shaped reinforcing steel bars above the hinge joint, placing a hinge joint reinforcing steel net piece inside the hinge joint, clamping a U-shaped buckle of the positioning support on the door-shaped reinforcing steel bars, fixing the hinge joint reinforcing steel net piece by a U-shaped fixing frame of the positioning support, moving the positioning support by a worker through a handle, and pouring concrete after the hinge joint reinforcing steel net piece is fixed;
step five, bridge deck repair construction: leveling the concrete pavement, the top surface of the expansion joint and the asphalt concrete pavement, wherein the height of the concrete pavement is 1-2mm lower than that of the pavement after the concrete is collected, and leveling the concrete pavement by using a ruler before the concrete is solidified;
step six, low-temperature maintenance construction of bridge deck concrete: the bridge floor repair concrete is maintained by adopting a movable maintenance shed which is easy to retract and is in a low-temperature environment;
seventhly, grouting and repairing the crack at the bottom of the beam: a slip shaft is arranged on a grouting support of the multipoint synchronous filling and sealing device, a movable grouting head is arranged on the slip shaft, and the position of the movable grouting head on the slip shaft is adjusted according to the trend of the beam bottom crack; the lower part of the grouting support is provided with a vertical rod, and a worker moves the grouting support through the vertical rod to perform grouting repair on the bottom crack of the beam.
Preferably, in the second step, square steel is arranged at the upper part of the lower cross beam, and a steel plate and a safety guardrail are arranged at the upper part of the square steel; the outer sides of the upper cross beam and the lower cross beam are connected through a hanging rod.
Preferably, in the fourth step, the positioning support mainly comprises a handle, a middle support rod, a U-shaped fixing frame, a U-shaped buckle and a support connecting rod, the handle is welded to the upper portion of the support connecting rod, the U-shaped fixing frame and the U-shaped buckle are welded to the lower portion of the support connecting rod, the middle support rods are uniformly arranged on the U-shaped fixing frame, and the middle support rods are supported on concrete on two sides of the hinge joint.
Preferably, in the sixth step, the low-temperature environment movable type easily-retractable curing shed mainly comprises a movable concrete thermal-insulation shed support, thermal-insulation cotton and pulleys, wherein the movable concrete thermal-insulation shed support is processed in a factory and assembled on site, the pulleys are arranged on the lower part of the movable concrete thermal-insulation shed support, and the thermal-insulation cotton covers the surface of the movable concrete thermal-insulation shed support.
Preferably, in the seventh step, a fixing ring is arranged on the grouting support of the multipoint synchronous potting device; the movable grouting head is connected with the grouting main pipe through a grouting hose, and the grouting main pipe is connected to the grouting support through a fixing ring.
The comprehensive reinforcing structure of the active hollow slab bridge is obtained by construction according to the construction method.
The invention has the beneficial effects that:
1. the components of the comprehensive reinforcement system of the active-service hollow slab bridge are prefabricated and processed in factories, are high in construction speed, can be assembled on site and can be repeatedly used, and construction cost is reduced.
2. The capping beam honeycomb pitted surface repair construction platform adopts self-hanging fixed chiseled modified epoxy concrete or polymer mortar repair construction platform, the hinge joint treatment adopts an integrally-formed conjoined door-shaped reinforcing steel bar and hinge joint reinforcing steel bar net positioning device, the bridge surface concrete heat insulation adopts a low-temperature environment movable easily-folded maintenance shed, and the beam bottom crack grouting repair adopts a multi-point synchronous filling and sealing device, so that the operation is simple, the construction speed is accelerated, and the labor is saved.
3. The self-hanging fixed chiseled modified epoxy concrete or polymer mortar repairing construction platform, the positioning bracket and the multipoint synchronous filling and sealing device are matched with each other to realize the comprehensive reinforcement of the existing hollow slab bridge, so that the structure is reasonable, economic and effective, and the construction quality of the reinforcement of the cover beam, the hinge joint and the bottom plate crack of the existing hollow slab bridge is effectively ensured.
Drawings
FIG. 1 is a schematic elevation view of an existing service hollow slab bridge integrated reinforcement system;
FIG. 2 is a schematic plan view of an active-service hollow slab bridge comprehensive reinforcement system;
FIG. 3 is a schematic illustration of a capping beam repair operations platform mounting cross-section;
FIG. 4 is a schematic longitudinal elevation view of the installation of the capping beam repair operations platform;
FIG. 5 is a schematic representation of a hinge joint repair proof;
FIG. 6 is a schematic view of a positioning frame;
FIG. 7 is a schematic plan view of a multi-point simultaneous encapsulation apparatus;
FIG. 8 is a schematic elevation view of a multi-point simultaneous encapsulation apparatus;
FIG. 9 is a schematic structural view of a mobile easily-retractable curing shed in a low-temperature environment;
FIG. 10 is a flow chart of the construction process of the present invention.
Description of reference numerals: 1-gravity type U-shaped abutment, 2-abutment body, 3-active hollow slab bridge, 4-conical slope, 5-expansion joint, 6-hinge joint, 7-capping beam, 8-safety guardrail, 9-lower cross beam, 10-square steel, 11-capping beam repair area, 12-pier column, 13-suspender, 14-vertical beam, 15-upper cross beam, 16-adjustable screw rod, 17-steel plate, 18-positioning bracket, 19-door-shaped reinforcing steel bar, 20-hinge joint reinforcing steel bar net piece, 21-concrete, 22-plugging sheet, 23-handle, 24-middle supporting rod, 25-U-shaped fixing frame, 26-U-shaped buckle, 27-movable grouting head, 28-sliding shaft, 29-grouting bracket and 30-grouting main pipe, 31-grouting hose, 32-vertical rod, 33-low-temperature environment movable concrete heat preservation shed, 34-movable concrete heat preservation shed support, 35-heat preservation cotton, 36-middle beam, 37-support connecting rod, 38-pulley and 39-fixing ring.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
As an embodiment, the construction method of the comprehensive reinforcing structure of the active hollow slab bridge comprises the following main construction steps:
step one, construction preparation: the related components of the comprehensive reinforcing structure of the existing hollow slab bridge are processed and manufactured in a centralized manner in a factory;
step two, bent cap repair construction: the capping beam repairing area 11 adopts a self-hanging fixed chiseling modified epoxy concrete or polymer mortar repairing construction platform, the structure of the capping beam repairing area is composed of a safety guardrail 8, a lower cross beam 9, square steel 10, a capping beam repairing area 11, a pier stud 12, a hanger rod 13, a vertical beam 14, an upper cross beam 15, an adjustable screw 16, a steel plate 17, a middle cross beam 36 and the like, the upper cross beam 15, the middle cross beam 36 and the lower cross beam 9 are connected through the vertical beam 14 at the side close to the capping beam, wherein the upper cross beam 15 and the middle cross beam 36 are fixed on the capping beam, and the adjustable screw 16 is arranged on the middle cross beam 36 and supported on the pier stud 12; the upper part of the lower cross beam 9 is provided with square steel 10, and the upper part of the square steel 10 is provided with a steel plate 17 and a safety guardrail 8; the outer sides of the upper cross beam 15 and the lower cross beam 9 are connected through a hanging rod 13; the worker performs the construction of the bent cap repairing area 11 on the construction platform.
Step three, chiseling bridge deck concrete: the accurate reserved position is popped out by adopting the ink line, the concrete cutting machine is used for cutting, and the bridge deck pavement layer edge is ensured to be neat and smooth without defects during cutting. And then crushing and chiseling the cutting positions at the east and west sides of the expansion joint by using a rock drill.
Fourthly, hinge joint repairing construction: the positioning support 18 consists of a handle 23, a middle support rod 24, a U-shaped fixing frame 25, a U-shaped buckle 26 and a support connecting rod 37, the handle 23 is welded on the upper portion of the support connecting rod 37, the U-shaped fixing frame 25 and the U-shaped buckle 26 are welded on the lower portion of the support connecting rod 37, the support rods 24 are uniformly arranged on the U-shaped fixing frame 25, and the support rods 24 are supported on concrete on two sides of the hinge joint 6; evenly arrange door font reinforcing bar 19 above the hinge joint 6, the inside hinge joint reinforcing bar net piece 20 of placing of hinge joint 6, the U type buckle 26 of locating support 18 blocks on door font reinforcing bar 19, and the U type mount 25 of locating support 18 is fixed hinge joint reinforcing bar net piece 20, and the workman removes locating support 18 through handle 23, pours the concrete after hinge joint reinforcing bar net piece 20 is fixed to accomplish.
Step five, bridge deck repair construction: the concrete pavement should be leveled with the top surface of the expansion joint and the asphalt concrete pavement, the height of the pavement after the concrete is collected should be slightly lower than the pavement by 1-2mm, and in order to ensure the flatness, the concrete should be leveled with a ruler at least twice before the concrete is solidified.
Step six, low-temperature maintenance construction of bridge deck concrete: the movable easy-to-retract maintenance shed 33 in the low-temperature environment consists of a movable concrete heat-preservation shed support 34, heat-preservation cotton 35 and pulleys 38, wherein the movable concrete heat-preservation shed support 34 is processed in a factory and assembled on site, the pulleys 38 are arranged at the lower part of the movable concrete heat-preservation shed support 34, and the heat-preservation cotton 35 is covered; the bridge floor repair concrete is maintained by adopting a low-temperature environment movable easy-to-retract maintenance shed 33.
Seventhly, grouting and repairing the crack at the bottom of the beam: the multipoint synchronous filling and sealing device comprises a movable grouting head 27, a sliding shaft 28, a grouting support 29, a grouting main pipe 30, a grouting hose 31, a vertical rod 32 and a fixing ring 39, wherein the grouting support 29 is provided with the sliding shaft 28 and the fixing ring 39, the sliding shaft 28 is provided with the movable grouting head 27, and the position of the movable grouting head 27 on the sliding shaft 28 is adjusted according to the trend of a beam bottom crack; the movable grouting head 27 is connected with a grouting main pipe 30 through a grouting hose 31, wherein the grouting main pipe 30 is connected to a grouting support 29 through a fixing ring 39, a vertical rod 32 is arranged on the lower portion of the grouting support 29, and a worker moves the grouting support 29 through the vertical rod 32 to perform grouting repair on a beam bottom crack.
The comprehensive reinforcing structure of the active hollow slab bridge constructed according to the construction method is shown in fig. 1-8 and comprises a self-hanging fixed chiseled modified epoxy concrete or polymer mortar repairing construction platform, a positioning bracket 18 and a multipoint synchronous encapsulating device; the concrete grouting device comprises a gravity type U-shaped bridge abutment 1, a bridge body 2, an existing hollow slab bridge 3, a conical slope 4, an expansion joint 5, a hinge joint 6, a cover beam 7, a safety guardrail 8, a lower cross beam 9, square steel 10, a cover beam repairing area 11, a pier stud 12, a suspender 13, a vertical beam 14, an upper cross beam 15, an adjustable screw 16, a steel plate 17, a positioning support 18, a door-shaped reinforcing steel bar 19, a hinge joint reinforcing steel bar net piece 20, concrete 21, a plugging sheet 22, a handle 23, a middle support rod 24, a U-shaped fixing frame 25, a U-shaped buckle 26, a movable grouting head 27, a sliding shaft 28, a grouting support 29, a grouting main pipe 30, a grouting hose 31, a vertical rod 32, a low-temperature environment movable concrete heat-preservation shed 33, a movable concrete heat-preservation shed support 34, heat-preservation cotton 35, a middle cross beam 36, a support connecting rod 37, a pulley 38 and a fixing ring 39; the honeycomb pitted surface of the bent cap 7 is repaired by adopting a self-hanging fixed chiseled modified epoxy concrete or polymer mortar repairing construction platform, hinge joints 6 are treated by adopting integrally formed and connected door-shaped reinforcing steel bars 19 and hinge joint reinforcing steel net pieces 20 positioning devices, the bridge deck concrete is insulated by adopting a low-temperature environment movable easily-retractable maintenance shed 33, and the bottom cracks of the beam are grouted and repaired by adopting a multipoint synchronous filling and sealing device.
The capping beam repairing area 11 adopts a self-hanging fixed chiseling modified epoxy concrete or polymer mortar repairing construction platform, the structure of the capping beam repairing area mainly comprises a safety guardrail 8, a lower cross beam 9, square steel 10, a capping beam repairing area 11, a pier stud 12, a hanger rod 13, a vertical beam 14, an upper cross beam 15, an adjustable screw 16, a steel plate 17, a middle cross beam 36 and the like, the upper cross beam 15, the middle cross beam 36 and the lower cross beam 9 are connected through the vertical beam 14 at the side close to the capping beam, wherein the upper cross beam 15 and the middle cross beam 36 are fixed on the capping beam, and the adjustable screw 16 is arranged on the middle cross beam 36 and supported on the pier stud 12; the upper part of the lower cross beam 9 is provided with square steel 10, and the upper part of the square steel 10 is provided with a steel plate 17 and a safety guardrail 8; the outer sides of the upper cross beam 15 and the lower cross beam 9 are connected through a hanging rod 13; the worker performs the construction of the bent cap repairing area 11 on the construction platform.
The positioning support 18 consists of a handle 23, a middle support rod 24, a U-shaped fixing frame 25, a U-shaped buckle 26 and a support connecting rod 37, the handle 23 is welded on the upper part of the support connecting rod 37, the U-shaped fixing frame 25 and the U-shaped buckle 26 are welded on the lower part of the support connecting rod 37, the support rods 24 are uniformly arranged on the U-shaped fixing frame 25, and the support rods 24 are supported on concrete on two sides of the hinge joint 6; door-shaped reinforcing steel bars 19 are uniformly arranged above the hinge joints 6, hinge joint reinforcing steel mesh sheets 20 are placed inside the hinge joints 6, U-shaped buckles 26 of the positioning supports 18 are clamped on the door-shaped reinforcing steel bars 19, the hinge joint reinforcing steel mesh sheets 20 are fixed by U-shaped fixing frames 25 of the positioning supports 18, and workers move the positioning supports 18 through handles 23.
The movable low-temperature environment easily-retractable maintenance shed 33 consists of a movable concrete heat-preservation shed support 34, heat-preservation cotton 35 and pulleys 38, wherein the movable concrete heat-preservation shed support 34 is processed in a factory and assembled on site, the pulleys 38 are arranged on the lower part of the movable concrete heat-preservation shed support 34, and the heat-preservation cotton 35 covers the surface of the movable concrete heat-preservation shed support 34; the bridge floor repair concrete is maintained by adopting a low-temperature environment movable easy-to-retract maintenance shed 33.
The beam bottom crack grouting repair adopts a multipoint synchronous filling and sealing device, the structure of the multipoint synchronous filling and sealing device mainly comprises a movable grouting head 27, a sliding shaft 28, a grouting support 29, a grouting main pipe 30, a grouting hose 31, a vertical rod 32 and a fixing ring 39, the grouting support 29 is provided with the sliding shaft 28 and the fixing ring 39, the sliding shaft 28 is provided with the movable grouting head 27, and the position of the movable grouting head 27 on the sliding shaft 28 is adjusted according to the direction of the beam bottom crack; the movable grouting head 27 is connected with a grouting main pipe 30 through a grouting hose 31, wherein the grouting main pipe 30 is connected to a grouting support 29 through a fixing ring 39, a vertical rod 32 is arranged on the lower portion of the grouting support 29, and a worker moves the grouting support 29 through the vertical rod 32 to perform grouting repair on a beam bottom crack.
The invention can effectively reduce the engineering cost, can realize centralized prefabrication, field assembly, quick positioning of the hinge joint reinforcing mesh, low-temperature maintenance of bridge deck concrete and the like, accelerates the construction speed, and can obtain better technical and economic benefits when being applied to actual engineering.
Claims (6)
1. A construction method of an active service hollow slab bridge comprehensive reinforcement structure is characterized by comprising the following steps:
step one, construction preparation: the related components of the comprehensive reinforcing structure of the existing hollow slab bridge are processed and manufactured in a centralized manner in a factory;
step two, bent cap repair construction: the capping beam repairing area (11) adopts a self-hanging fixed chiseling modified epoxy concrete or polymer mortar repairing construction platform, the upper cross beam (15), the middle cross beam (36) and the lower cross beam (9) are connected through the vertical beam (14) at the side close to the capping beam, the upper cross beam (15) and the middle cross beam (36) are fixed on the capping beam, and the middle cross beam (36) is provided with an adjustable screw (16) which is supported on the pier stud (12); a worker carries out construction of a capping beam repairing area (11) on the construction platform;
step three, chiseling bridge deck concrete: popping up an accurate reserved position by adopting an ink line, and cutting by using a concrete cutting machine; then crushing and chiseling the cutting positions at the east and west sides of the expansion joint by using a rock drill;
fourthly, hinge joint repairing construction: door-shaped reinforcing steel bars (19) are uniformly arranged above the hinge joint (6), a hinge joint reinforcing steel net piece (20) is placed inside the hinge joint (6), a U-shaped buckle (26) of a positioning support (18) is clamped on the door-shaped reinforcing steel bars (19), the hinge joint reinforcing steel net piece (20) is fixed by a U-shaped fixing frame (25) of the positioning support (18), a worker moves the positioning support (18) through a handle (23), and concrete is poured after the hinge joint reinforcing steel net piece (20) is fixed;
step five, bridge deck repair construction: leveling the concrete pavement, the top surface of the expansion joint and the asphalt concrete pavement, wherein the height of the concrete pavement is 1-2mm lower than that of the pavement after the concrete is collected, and leveling the concrete pavement by using a ruler before the concrete is solidified;
step six, low-temperature maintenance construction of bridge deck concrete: the bridge floor repair concrete is maintained by a movable easy-to-retract maintenance shed (33) in a low-temperature environment;
seventhly, grouting and repairing the crack at the bottom of the beam: a slip shaft (28) is arranged on a slip casting bracket (29) of the multipoint synchronous filling and sealing device, a movable slip casting head (27) is arranged on the slip shaft (28), and the position of the movable slip casting head (27) on the slip shaft (28) is adjusted according to the trend of the beam bottom cracks; the lower part of the grouting support (29) is provided with a vertical rod (32), and a worker moves the grouting support (29) through the vertical rod (32) to perform grouting repair on the bottom crack of the beam.
2. The construction method of the active hollow slab bridge comprehensive reinforcement structure according to claim 1, characterized in that in the second step, square steel (10) is arranged at the upper part of the lower cross beam (9), and a steel plate (17) and a safety guardrail (8) are arranged at the upper part of the square steel (10); the outer sides of the upper cross beam (15) and the lower cross beam (9) are connected through a hanger rod (13).
3. The construction method of the active hollow slab bridge comprehensive reinforcement structure according to claim 1, characterized in that in the fourth step, the positioning support (18) mainly comprises a handle (23), a middle support rod (24), a U-shaped fixing frame (25), a U-shaped buckle (26) and a support connecting rod (37), the handle (23) is welded on the upper portion of the support connecting rod (37), the U-shaped fixing frame (25) and the U-shaped buckle (26) are welded on the lower portion of the support connecting rod (37), the middle support rods (24) are uniformly arranged on the U-shaped fixing frame (25), and the middle support rods (24) are supported on concrete on two sides of the hinge joint (6).
4. The construction method of the active hollow slab bridge comprehensive reinforcement structure according to claim 1, characterized in that in the sixth step, the low-temperature environment movable easy-to-retract maintenance shed (33) mainly comprises a movable concrete thermal insulation shed support (34), thermal insulation cotton (35) and pulleys (38), the movable concrete thermal insulation shed support (34) is processed in a factory and assembled on site, the pulleys (38) are arranged on the lower portion of the movable concrete thermal insulation shed support (34), and the thermal insulation cotton (35) covers the surface of the movable concrete thermal insulation shed support (34).
5. The construction method of the active hollow slab bridge comprehensive reinforcement structure according to claim 1, characterized in that in the seventh step, a fixed ring (39) is arranged on a grouting support (29) of the multipoint synchronous potting device; the movable grouting head (27) is connected with a grouting main pipe (30) through a grouting hose (31), wherein the grouting main pipe (30) is connected to a grouting support (29) through a fixing ring (39).
6. The utility model provides an existing labour hollow slab bridge synthesizes reinforced structure which characterized in that: the construction method according to any one of claims 1 to 5.
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