CN112746569B - Old bridge ecological demolition structure and construction method - Google Patents
Old bridge ecological demolition structure and construction method Download PDFInfo
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- CN112746569B CN112746569B CN202110047852.6A CN202110047852A CN112746569B CN 112746569 B CN112746569 B CN 112746569B CN 202110047852 A CN202110047852 A CN 202110047852A CN 112746569 B CN112746569 B CN 112746569B
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
The invention relates to an old bridge ecological demolition structure, which comprises a bridge demolition crane, an anchoring rod, an old bridge capping beam, an old bridge pier stud, an old bridge foundation, a lifting hook, a hoisting cable, an old bridge cast-in-place plate, a transport vehicle, an old bridge demolition unit, a guardrail demolition stabilizing device, a pontoon crane, a demolition unit dividing line, a blast hole, a hoisting hole, a flying stone protective net and a movable type supporting protective system; an old bridge pier column is arranged at the upper part of the old bridge foundation, an old bridge coping is arranged at the upper part of the old bridge pier column, and an old bridge cast-in-place plate is erected at the upper part of the old bridge coping; the guardrail dismounting and stabilizing device comprises a stabilizing inclined rod, a stabilizing hook, a bolt and a base, wherein the stabilizing hook is connected with the upper end of the stabilizing inclined rod, and the lower end of the stabilizing inclined rod is connected with the base with a bolt hole. The invention has the beneficial effects that: the invention adopts the protective net covering the flying stones in the static blasting area to split the flying stones in sections, thereby not only preventing the flying stones from smashing people, but also preventing dust, avoiding the defects and the limitations in the traditional blasting construction, protecting the environment and having high safety.
Description
Technical Field
The invention relates to the technical field of bridge demolition engineering, in particular to an old bridge ecological demolition structure and a construction method.
Background
With the rapid increase of the socioeconomic level, the national traffic infrastructure is rapidly developed, and part of roads, railways and bridges built in early stage are not suitable for the current traffic demand. Especially, the bridges which cannot meet the modern traffic requirements or reach the design age need to be dismantled, otherwise, the national and people's lives and properties are greatly lost.
In the existing bridge demolition construction technology, mechanical crushing demolition, blasting, cutting, decomposition and hoisting are mainly adopted. When the bridge is dismantled, the stability of the structure should be ensured as much as possible, and the bridge cannot be influenced by too much vibration, impact and the like. Although the construction period of mechanical crushing and demolition construction and blasting construction is short, the investment of mechanical equipment is less, the environmental pollution is great in the construction process, a certain safety distance needs to be kept between the blasting construction and surrounding buildings, and strict safety and traffic control needs to be carried out on a construction site. And although the cutting, decomposing and hoisting are adopted, the demolition noise is low, the air pollution is low, the construction period is overlong, and the investment of large-scale mechanical crushing technology is large.
Therefore, the existing need for an old bridge ecological demolition structure and a construction method which have the advantages of small environmental pollution, reasonable construction period and high safety is very important.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an old bridge ecological dismantling structure and a construction method.
The old bridge ecological demolition structure comprises a bridge demolition crane, an anchoring rod, an old bridge capping beam, an old bridge pier stud, an old bridge foundation, a lifting hook, a hoisting cable, an old bridge cast-in-place plate, a transport vehicle, an old bridge demolition unit, a guardrail demolition stabilizing device, a pontoon crane, a demolition unit dividing line, a blast hole, a hoisting hole, a flying stone protective net and a movable support protective system; an old bridge pier column is arranged at the upper part of the old bridge foundation, an old bridge coping is arranged at the upper part of the old bridge pier column, and an old bridge cast-in-place plate is erected at the upper part of the old bridge coping; the guardrail dismounting and stabilizing device comprises a stabilizing inclined rod, a stabilizing hook, a bolt and a base, wherein the stabilizing hook is connected with the upper end of the stabilizing inclined rod, the lower end of the stabilizing inclined rod is connected with the base with a bolt hole, and the base is fixedly connected with an old bridge cast-in-place plate through the bolt; the bridge dismantling crane is arranged on an old bridge capping beam through an anchoring rod, the old bridge cast-in-place plate forms a plurality of old bridge dismantling units through arranging dismantling unit dividing lines, lifting holes are arranged at four corners of the old bridge dismantling units, blast holes are arranged on the dismantling unit dividing lines, the flyrock protective net is covered and arranged in the dismantling unit dividing line area, one end of the hoisting cable is connected with the lifting hole, the other end of the hoisting cable is connected with a lifting hook on the bridge dismantling crane, the transport vehicle is arranged on the old bridge cast-in-place plate, and the pontoon crane is arranged in a river channel; protection system is strutted to movable type includes first roof, second roof, elevating gear, travelling car, track, horizontal sleeper beam, steel corbel, bow-shaped bailey roof and synchronous tie rod, the steel corbel sets up in old bridge pier stud both sides, sets up bow-shaped bailey roof between the adjacent steel corbel of homonymy, set up horizontal sleeper beam on the bow-shaped bailey roof, set up the track on the horizontal sleeper beam, set up the travelling car on the track, be equipped with elevating gear on the travelling car, the elevating gear top is equipped with first roof and second roof in proper order, synchronous tie rod cross arrangement is between the travelling car of old bridge pier stud both sides.
Preferably, the method comprises the following steps: the shape of the stabilizing hook is the same as the shape of the top of the guardrail of the old bridge at the edge of the cast-in-place slab of the old bridge.
Preferably, the method comprises the following steps: the old bridge capping beam, the old bridge pier column and the old bridge foundation are temporary reserved structures and serve as foundations for erecting the bridge dismantling crane.
Preferably, the method comprises the following steps: the length of the movable trolley is equal to the length of the two old bridge dismantling units.
Preferably, the method comprises the following steps: first roof and second roof lead to the length setting and demolish the unit below at old bridge, first roof setting is in the below that the unit was demolishd at the old bridge of waiting to demolish, the unit was demolishd at adjacent old bridge below to the second roof setting.
Preferably, the method comprises the following steps: the flyrock protective net is of a double-layer structure, the inner layer is a flyrock-preventing steel wire mesh, and the outer layer is a dustproof fine mesh.
The construction method of the ecological demolition structure of the old bridge comprises the following steps:
1) dismantling the auxiliary structure of the bridge deck system: the method comprises the following steps of (1) segmenting old bridge guardrails, arranging guardrail dismantling and stabilizing devices at intervals on the inner sides of the segmented guardrails, sequentially cutting the old bridge guardrails, and conveying the old bridge guardrails to a dismantling workshop for detailed dismantling through a transport vehicle hoisted to a bridge floor by an automobile;
2) dismantling the old bridge cast-in-place plate in sections:
dividing old bridge dismantling units: carrying out construction measurement paying-off and marking on the old bridge cast-in-place plate, dividing the old bridge cast-in-place plate into a plurality of sections of old bridge dismantling units, drilling lifting holes on the old bridge dismantling units, and drilling blast holes on the division lines of the dismantling units which are dismantled firstly;
installing a movable supporting protection system: firstly, mounting steel corbels on two sides of an old bridge pier stud by using anchor bolts, bolting and mounting arched Bailey beams on the steel corbels by taking a pier span as a unit, then sequentially mounting transverse sleepers and rails on the arched Bailey beams, finally mounting the assembled movable trolley on the rails on two sides of the old bridge pier stud, mounting a lifting device on the movable trolley, and mounting a synchronous connecting rod, a first top plate and a second top plate between the movable trolleys;
erecting and installing a bridge-dismantling crane: when the first span of the old bridge cast-in-place slab is dismantled, the bridge dismantling crane is installed at the bank side, and from the second span, the old bridge capping beam, the old bridge pier stud and the old bridge foundation which are temporarily reserved are used as the bearing foundation of the bridge dismantling crane, and the bridge dismantling crane is erected on the old bridge capping beam by using the anchoring rod;
the bridge dismantling crane is firstly pre-connected with an old bridge dismantling unit to be dismantled by using a hoisting cable before segmental dismantling, the movable trolley is moved to the position below the old bridge dismantling unit to be dismantled and is braked, so that the first top plate is tightly propped against the old bridge dismantling unit to be dismantled, the second top plate is tightly propped against the adjacent old bridge dismantling unit, then explosives are installed in blast holes to cover flyrock protective nets, a static blasting technology is adopted for segmental dismantling, the movable trolley is sequentially placed into a transport vehicle on a bridge floor by using the bridge dismantling crane, and the movable trolley is transported to a dismantling workshop for detailed dismantling;
the operations are repeated to finish the dismantling work of the old bridge cast-in-place plate of one span, then the synchronous connecting tie rod, the first top plate and the second top plate on the bridge dismantling crane and the movable trolley are dismantled, the crane is moved to the next span to erect and install, and the dismantling work of the old bridge cast-in-place plate is carried out again until the dismantling work of all bridge floors is finished;
3) dismantling the movable support protection system and the bridge dismantling crane, transferring the pontoon crane in a river channel, drilling a lifting hole on an old bridge capping beam, connecting the lifting hole with a lifting hook on the pontoon crane by using a lifting rope for pre-connection, then cutting a connecting part of the old bridge capping beam and an old bridge pier column, finally hoisting the old bridge capping beam away, and conveying the old bridge capping beam to a dismantling workshop for detailed dismantling;
4) and (3) dismantling the old bridge pier stud and the old bridge foundation by adopting a static blasting technology, then hoisting to a specified place by using a floating crane for detailed dismantling, and finally cleaning the river channel to complete the construction of the old bridge ecological dismantling structure.
The beneficial effects of the invention are:
1. compared with the prior art, the method adopts the static blasting and cutting decomposition methods to hoist and disassemble the bridge structure, and finally concentrates the bridge structure to a specified place to perform mechanical crushing and dismantling, thereby integrating the advantages of three old bridge dismantling technologies, greatly reducing environmental pollution, protecting the reserved structure of the bridge and surrounding buildings, accelerating the construction progress and having obvious technical advantages.
2. The invention adopts the protective net covering the flying stones in the static blasting area to split the flying stones in sections, thereby not only preventing the flying stones from smashing people, but also preventing dust, avoiding the defects and the limitations in the traditional blasting construction, protecting the environment and having high safety.
3. The guardrail dismounting and stabilizing device provided by the invention has the advantages of reasonable structure, easiness in manufacturing and dismounting, capability of preventing the guardrail from toppling over or falling into a river during subsection cutting of the guardrail, and improvement on construction efficiency.
4. The movable support protection system is convenient to disassemble and assemble, can effectively prevent the cast-in-place slab of the old bridge from losing balance during construction of units to be disassembled, avoids the conditions of falling and the like, and ensures the construction safety.
Drawings
FIG. 1 is a construction schematic diagram of an old bridge ecological demolition structure;
FIG. 2 is a schematic view of the deployment of the guardrail removal stabilizer;
FIG. 3 is a schematic view of the guardrail removal stabilizer;
FIG. 4 is a schematic plan view of a blasthole and a drawhole;
FIG. 5 is a schematic illustration of the installation of the mobile shoring protection system;
FIG. 6 is a schematic plan view of the mobile shoring protection system;
FIG. 7 is an installation schematic of the bridge girder erection crane;
FIG. 8 is a construction drawing for dismantling an old bridge cast-in-place slab in sections;
fig. 9 is a schematic illustration of removal of an old bridge capping beam.
Description of reference numerals: 1-bridge removal crane; 2-anchoring rod; 3-old bridge capping beam; 4-old pier stud; 5-old bridge foundation; 6-lifting hook; 7-hoisting cable; 8-old bridge cast-in-place slab; 9-transport vehicle; 10-old bridge demolition unit; 11-river channel; 12-old bridge guard rail; 13-dismantling the stabilizing device of the guardrail; 14-firm diagonal; 15-stabilizing hook; 16-bolt; 17-base; 18-floating crane; 19-demolition unit division line; 20-blast hole; 21-hanging hole; 22-first top panel; 23-second top panel; 24-lifting device; 25-moving the trolley; 26-track; 27-transverse sleeper beam; 28-steel corbel; 29-bow shaped bailey beam; 30-flying stone protective net; 31-synchronous tie rod.
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.
Example one
The old bridge ecological demolition structure comprises a bridge demolition crane 1, an anchoring rod 2, an old bridge capping beam 3, an old bridge pier stud 4, an old bridge foundation 5, a lifting hook 6, a hoisting cable 7, an old bridge cast-in-place plate 8, a transport vehicle 9, an old bridge demolition unit 10, a guardrail demolition stabilizing device 13, a pontoon crane 18, a demolition unit dividing line 19, a blast hole 20, a hoisting hole 21, a flying stone protective net 30 and a movable supporting protective system; an old bridge pier column 4 is arranged at the upper part of the old bridge foundation 5, an old bridge coping 3 is arranged at the upper part of the old bridge pier column 4, and an old bridge cast-in-place plate 8 is erected at the upper part of the old bridge coping 3; the guardrail dismounting and stabilizing device 13 comprises a stabilizing inclined rod 14, a stabilizing hook 15, a bolt 16 and a base 17, wherein the stabilizing hook 15 is connected with the upper end of the stabilizing inclined rod 14, the lower end of the stabilizing inclined rod 14 is connected with the base 17 with a bolt hole, and the base 17 can be fixedly connected with an old bridge cast-in-place plate 8 through the bolt 16; the bridge dismantling crane 1 is arranged on an old bridge capping beam 3 through an anchor rod 2, the old bridge cast-in-place plate 8 forms a plurality of old bridge dismantling units 10 by arranging dismantling unit dividing lines 19, hanging holes 21 are arranged at four corners of each old bridge dismantling unit 10, blast holes 20 are arranged on the dismantling unit dividing lines 19, a flying stone protective net 30 is covered and arranged in the area of the dismantling unit dividing lines 19, one end of a hoisting cable 7 is connected with the hanging holes 21, the other end of the hoisting cable is connected with a lifting hook 6 on the bridge dismantling crane 1, the transport vehicle 9 is arranged on the old bridge cast-in-place plate 8, and the floating boat crane 18 is arranged in a river channel 11; the movable supporting protection system comprises a first top plate 22, a second top plate 23, a lifting device 24, a movable trolley 25, rails 26, transverse sleepers 27, steel corbels 28, arched Bailey beams 29 and synchronous connecting rods 31, wherein the steel corbels 28 are arranged on two sides of an old bridge pier column 4, the arched Bailey beams 29 are arranged between the adjacent steel corbels 28 on the same side, the transverse sleepers 27 are arranged on the arched Bailey beams 29, the rails 26 are arranged on the transverse sleepers 27, the movable trolley 25 is arranged on the rails 26, the lifting device 24 is arranged on the movable trolley 25, the first top plate 22 and the second top plate 23 are sequentially arranged on the top of the lifting device 24, and the synchronous connecting rods 31 are arranged between the movable trolleys 25 on two sides of the old bridge pier column 4 in a crossed mode.
The shape of the stabilizing hook 15 is the same as the shape of the top of the old bridge guardrail 12 at the edge of the old bridge cast-in-place slab 8.
The old bridge capping beam 3, the old bridge pier stud 4 and the old bridge foundation 5 are temporary reserved structures and serve as foundations for erecting the bridge dismantling crane 1.
The bridge dismantling crane 1 is mainly used for dismantling a bridge deck system and an old bridge cast-in-place plate 8, and the pontoon crane 18 is mainly used for dismantling an old bridge capping beam 3, an old bridge pier stud 4 and an old bridge foundation 5.
The length of the travelling trolley 25 is equal to the length of the two old bridge demolition units 10.
The first top plate 22 and the second top plate 23 are arranged below the old bridge dismantling unit 10 in a whole length mode, the first top plate 22 is arranged below the old bridge dismantling unit 10 to be dismantled during construction, and the second top plate 23 is arranged below the adjacent old bridge dismantling unit 10.
The flyrock protective net 30 is of a double-layer structure, the inner layer is a flyrock-proof steel wire mesh, and the outer layer is a dustproof fine mesh.
Example two
The construction method of the old bridge ecological demolition system comprises the following steps:
1) as shown in fig. 2 and 3, the deck system auxiliary structure is dismantled: the method comprises the following steps of segmenting old bridge guardrails 12, arranging guardrail dismantling and stabilizing devices 13 at intervals on the inner sides of the segmented guardrails, sequentially cutting the old bridge guardrails 12, and conveying the old bridge guardrails to a dismantling workshop for detailed dismantling through an automobile hoisting and placing the old bridge guardrails into a transport vehicle 9 of a bridge floor;
2) and (3) dismantling the old bridge cast-in-place plate 8 in sections:
as shown in fig. 4, the old bridge demolition unit 10 is divided: carrying out construction measurement paying-off and marking on the old bridge cast-in-place plate 8, dividing the old bridge cast-in-place plate 8 into a plurality of sections of old bridge dismantling units 10, drilling lifting holes 21 on the old bridge dismantling units 10, and drilling blast holes 20 on a division line 19 of the dismantling unit which is dismantled firstly;
secondly, as shown in fig. 5 and 6, installing a movable supporting protection system: firstly, mounting steel corbels 28 on two sides of an old bridge pier stud 4 by using anchor bolts, bolting and mounting an arched Bailey beam 29 on the steel corbel 28 by taking a pier span as a unit, then sequentially mounting a transverse sleeper beam 27 and a track 26 on the arched Bailey beam 29, finally mounting an assembled movable trolley 25 on the track 26 on two sides of the old bridge pier stud 4, mounting a high-power lifting device 24 on the movable trolley 25, and mounting a synchronous connecting tie rod 31, a first top plate 22 and a second top plate 23 between the movable trolleys 25;
thirdly, as shown in fig. 7, the bridge removal crane 1 is erected and installed: when the first span of the old bridge cast-in-place plate 8 is dismantled, the bridge dismantling crane 1 is installed at the bank side, and from the second span, the temporarily reserved old bridge capping beam 3, the old bridge pier stud 4 and the old bridge foundation 5 are used as the bearing foundation of the bridge dismantling crane 1, and the bridge dismantling crane 1 is erected on the old bridge capping beam 3 by using the anchoring rod 2;
fourthly, as shown in fig. 1 and 8, before segmental dismantling, the bridge dismantling crane 1 is firstly pre-connected with the old bridge dismantling unit 10 to be dismantled by using a hoisting cable 7, the movable trolley 25 is moved to the position below the old bridge dismantling unit 10 to be dismantled and is braked, so that the first top plate 22 props against the old bridge dismantling unit 10 to be dismantled, the second top plate 23 props against the adjacent old bridge dismantling unit 10, then explosives are installed in blast holes 20, the flyrock protective net 30 is covered, segmental dismantling is carried out by adopting a static blasting technology, the bridge dismantling crane 1 is sequentially lowered into a transport vehicle 9 on the bridge floor, and the transport vehicle is conveyed to a dismantling workshop for detailed dismantling;
the operations are repeated to finish the dismantling work of the old bridge cast-in-place plate 8 of one span, then the synchronous connecting tie rod 31, the first top plate 22 and the second top plate 23 on the bridge dismantling crane 1 and the movable trolley 25 are dismantled, the crane is moved to the next span to erect and install, and the dismantling work of the old bridge cast-in-place plate 8 is carried out again until the dismantling work of all bridge floors is finished;
3) as shown in fig. 9, the mobile supporting protection system and the bridge dismantling crane 1 are dismantled, the floating vessel crane 18 is transferred to the river, the hanging hole 21 is drilled on the old bridge capping beam 3, the hanging hole 21 is connected with the hook 6 on the floating vessel crane 18 by using the hanging rope 7 for pre-connection, then the connecting part of the old bridge capping beam 3 and the old bridge pier stud 4 is cut, and finally the old bridge capping beam 3 is hoisted away and transported to a dismantling workshop for detailed dismantling;
4) and (3) dismantling the old bridge pier stud 4 and the old bridge foundation 5 by adopting a static blasting technology, hoisting to a specified place by using a floating crane 18 for detailed dismantling, and finally cleaning the river channel 11 to complete the construction of the old bridge ecological dismantling structure.
Claims (5)
1. The utility model provides an old bridge ecology demolishs structure which characterized in that: the device comprises a bridge dismantling crane (1), an anchoring rod (2), an old bridge capping beam (3), an old bridge pier stud (4), an old bridge foundation (5), a lifting hook (6), a lifting rope (7), an old bridge cast-in-place plate (8), a transport vehicle (9), an old bridge dismantling unit (10), a guardrail dismantling and stabilizing device (13), a pontoon crane (18), a dismantling unit dividing line (19), a blast hole (20), a lifting hole (21), a flying stone protective net (30) and a movable type supporting protective system; an old bridge pier column (4) is arranged at the upper part of the old bridge foundation (5), an old bridge coping (3) is arranged at the upper part of the old bridge pier column (4), and an old bridge cast-in-place plate (8) is erected at the upper part of the old bridge coping (3); the old bridge capping beam (3), the old bridge pier column (4) and the old bridge foundation (5) are temporary reserved structures and serve as foundations for erecting the bridge dismantling crane (1); the guardrail dismounting and stabilizing device (13) comprises a stabilizing inclined rod (14), a stabilizing hook (15), a bolt (16) and a base (17), wherein the shape of the stabilizing hook (15) is the same as that of the top of an old bridge guardrail (12) at the edge of an old bridge cast-in-place plate (8); the stabilizing hook (15) is connected with the upper end of the stabilizing diagonal rod (14), the lower end of the stabilizing diagonal rod (14) is connected with a base (17) with a bolt hole, and the base (17) is fixedly connected with the old bridge cast-in-place plate (8) through a bolt (16); the bridge dismantling crane (1) is arranged on an old bridge capping beam (3) through an anchoring rod (2), the old bridge cast-in-place plate (8) forms a plurality of old bridge dismantling units (10) by arranging dismantling unit dividing lines (19), lifting holes (21) are arranged at four corners of each old bridge dismantling unit (10), blast holes (20) are arranged on the dismantling unit dividing lines (19), a flyrock protective net (30) is covered and arranged in the area of the dismantling unit dividing lines (19), one end of each lifting cable (7) is connected with each lifting hole (21), the other end of each lifting cable is connected with each lifting hook (6) on the bridge dismantling crane (1), the transport vehicle (9) is arranged on the old bridge cast-in-place plate (8), and the pontoon crane (18) is arranged in a river channel (11); the movable supporting protection system comprises a first top plate (22), a second top plate (23), a lifting device (24), a movable trolley (25), a track (26), a transverse sleeper beam (27), a steel corbel (28), an arched Berea beam (29) and a synchronous connecting rod (31), the steel brackets (28) are arranged on two sides of the old bridge pier column (4), an arched Bailey beam (29) is arranged between the adjacent steel brackets (28) on the same side, a transverse sleeper beam (27) is arranged on the arched Bailey beam (29), a track (26) is arranged on the transverse sleeper beam (27), a moving trolley (25) is arranged on the track (26), a lifting device (24) is arranged on the moving trolley (25), the top of the lifting device (24) is sequentially provided with a first top plate (22) and a second top plate (23), the synchronous connecting rod (31) is arranged between the movable trolleys (25) on two sides of the old bridge pier column (4) in a crossing manner.
2. The ecological demolition structure of an old bridge according to claim 1, characterized in that: the length of the movable trolley (25) is equal to the length of the two old bridge dismantling units (10).
3. The ecological demolition structure of an old bridge according to claim 1, characterized in that: the first top plate (22) and the second top plate (23) are arranged below the old bridge dismantling unit (10) in a whole length mode, the first top plate (22) is arranged below the old bridge dismantling unit (10) to be dismantled, and the second top plate (23) is arranged below the adjacent old bridge dismantling unit (10).
4. The ecological demolition structure of an old bridge according to claim 1, characterized in that: the flyrock protective net (30) is of a double-layer structure, the inner layer is a flyrock-preventing steel wire net, and the outer layer is a dustproof fine net.
5. A construction method of an old bridge ecological demolition structure based on claim 1 is characterized by comprising the following steps:
1) dismantling the auxiliary structure of the bridge deck system: the method comprises the following steps of segmenting old bridge guardrails (12), arranging guardrail dismantling and stabilizing devices (13) on the inner sides of the segmented guardrails at intervals, sequentially cutting the old bridge guardrails (12), and conveying the old bridge guardrails to a dismantling workshop through a transport vehicle (9) hoisted to a bridge floor by an automobile for detailed dismantling;
2) and (3) removing the old bridge cast-in-place plate (8) in a segmented manner:
dividing an old bridge dismantling unit (10): carrying out construction measurement paying-off and marking on the old bridge cast-in-place plate (8), dividing the old bridge cast-in-place plate (8) into a plurality of sections of old bridge dismantling units (10), drilling lifting holes (21) on the old bridge dismantling units (10), and drilling blast holes (20) on a division line (19) of a dismantling unit which is dismantled firstly;
installing a movable supporting protection system: firstly, mounting steel corbels (28) on two sides of an old bridge pier stud (4) by using anchor bolts, bolting and mounting an arched Bailey beam (29) on each steel corbel (28) by taking a pier span as a unit, then sequentially mounting transverse sleepers (27) and rails (26) on the arched Bailey beam (29), finally mounting an assembled movable trolley (25) on the rails (26) on two sides of the old bridge pier stud (4), mounting a lifting device (24) on the movable trolley (25), and mounting a synchronous connecting rod (31), a first top plate (22) and a second top plate (23) among the movable trolleys (25);
erecting and installing the bridge-dismantling crane (1): when an old bridge cast-in-place plate (8) is dismantled from a first span, a bridge dismantling crane (1) is installed on the bank side, from a second span, the temporarily reserved old bridge capping beam (3), old bridge pier stud (4) and old bridge foundation (5) are used as the bearing foundation of the bridge dismantling crane (1), and the bridge dismantling crane (1) is erected on the old bridge capping beam (3) by using an anchoring rod (2);
the bridge dismantling crane (1) and an old bridge dismantling unit (10) to be dismantled are pre-connected through a hoisting rope (7) before subsection dismantling, a moving trolley (25) is moved to the position below the old bridge dismantling unit (10) to be dismantled and is braked, so that a first top plate (22) props against the old bridge dismantling unit (10) to be dismantled, a second top plate (23) props against the adjacent old bridge dismantling unit (10), then explosive is installed in blast holes (20), a flying stone protective net (30) is covered, subsection dismantling is conducted through a static blasting technology, the bridge dismantling crane (1) is sequentially placed into a transport vehicle (9) on a bridge floor, and the transport vehicle is conveyed to a dismantling workshop to be dismantled in detail;
the operations are repeated to finish the dismantling work of the old bridge cast-in-place plate (8) of one span section, then the synchronous connecting rod (31), the first top plate (22) and the second top plate (23) on the bridge dismantling crane (1) and the mobile trolley (25) are dismantled, the crane is moved to the next span section for erection and installation, and the dismantling work of the old bridge cast-in-place plate (8) is carried out again until the dismantling work of all bridge floors is finished;
3) dismantling the movable supporting protection system and the bridge dismantling crane (1), transferring the floating crane (18) in a river channel, firstly drilling a lifting hole (21) on the old bridge capping beam (3), utilizing a lifting rope (7) to connect the lifting hole (21) with a lifting hook (6) on the floating crane (18) for pre-connection, then cutting the connecting part of the old bridge capping beam (3) and the old bridge pier stud (4), finally hoisting the old bridge capping beam (3), and conveying the old bridge capping beam to a dismantling workshop for detailed dismantling;
4) and (3) removing the old bridge pier stud (4) and the old bridge foundation (5) by adopting a static blasting technology, hoisting to a specified place by using a floating crane (18) for detailed removal, and finally cleaning the river channel (11) to complete the construction of the old bridge ecological removal structure.
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| CN202110047852.6A CN112746569B (en) | 2021-01-14 | 2021-01-14 | Old bridge ecological demolition structure and construction method |
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| CN112746569B true CN112746569B (en) | 2022-07-12 |
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| CN113235469A (en) * | 2021-05-24 | 2021-08-10 | 中铁建大桥工程局集团第五工程有限公司 | Sectional blasting demolition method for large bridge |
| CN113774822B (en) * | 2021-09-15 | 2023-03-21 | 中交二航局第三工程有限公司 | Dismantling method of old reinforced concrete bridge |
| CN114134829B (en) * | 2021-12-29 | 2023-08-08 | 杭州萧山交通建设管理有限公司 | Prestressed hollow slab girder bridge dismantling system and construction method |
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| JP2014190107A (en) * | 2013-03-28 | 2014-10-06 | Noda Jidosha Kogyosho:Kk | Method of building bridge girder, removal method, and apparatus for constructing bridge girder |
| CN105113434B (en) * | 2015-09-18 | 2017-03-01 | 杭州江润科技有限公司 | On remove supporting construction and construction method across operation highway spandrelless arch bridge framing |
| CN107268462A (en) * | 2017-06-27 | 2017-10-20 | 浙江交工集团股份有限公司 | A kind of overbridge static(al) removes the construction method in situ rebuild and its special protection net |
| CN108589565B (en) * | 2018-04-26 | 2023-11-07 | 安徽省公路桥梁工程有限公司 | Bridge dismantling structure system and construction method |
| CN111960245B (en) * | 2020-06-24 | 2022-06-28 | 广东力特工程机械有限公司 | Hoisting and rope hanging method for viaduct dismantling |
| CN214459762U (en) * | 2021-01-14 | 2021-10-22 | 湖北省路桥集团有限公司 | Old bridge ecological demolition structure |
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Denomination of invention: Ecological Demolition Structure and Construction Method of Old Bridges Effective date of registration: 20230927 Granted publication date: 20220712 Pledgee: Industrial Bank Limited by Share Ltd. Wuhan branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2023980059401 |