CN110984001A - Light-duty bridge-dismantling crane system and construction method thereof - Google Patents
Light-duty bridge-dismantling crane system and construction method thereof Download PDFInfo
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- CN110984001A CN110984001A CN202010054588.4A CN202010054588A CN110984001A CN 110984001 A CN110984001 A CN 110984001A CN 202010054588 A CN202010054588 A CN 202010054588A CN 110984001 A CN110984001 A CN 110984001A
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Abstract
A light bridge-dismantling crane system and a construction method are provided, the light bridge-dismantling crane comprises a steel truss structure, a hoisting pulley block and a winch, and the steel truss structure comprises a base, a stand column, a front compression bar, a rear pull rod, an upper longitudinal beam and a transverse connecting rod. The light bridge-dismantling crane has the advantages of ingenious structural design, light self weight, good economy, capability of being particularly suitable for bridge dismantling in the presence of serious diseases and incapable of bearing heavy equipment, capability of enabling the light bridge-dismantling crane to be synchronously arranged to descend and dismantle even if an old bridge is provided with a plurality of cantilever sections, and short relative construction period. In the bridge dismantling process, two bridge deck cranes are adopted on the same cross section, and the hoisting pre-tightening force can be effectively adjusted when the cutting progress of the webs on the two sides is different in the bridge dismantling process. The winch of the bridge deck crane is anchored on the upper side of the No. 0 block, namely the pier top, and an operator is also positioned on the pier top, so that the operator is prevented from being directly positioned on the block section to be disassembled, and the construction safety can be effectively improved.
Description
Technical Field
The invention belongs to the field of bridge dismantling, and particularly relates to a light bridge dismantling crane system and an installing and dismantling method thereof.
Background
Along with the continuous development of the economy of cities, the traffic volume is continuously increased, and the number of overload vehicles is continuously increased, so that certain influence is brought to the bridge. Under the repeated action of a heavy vehicle, the bridge deck of the full bridge is seriously abraded, the serious peeling and bone exposing phenomena occur, the concrete is damaged and cracked at multiple positions of the full bridge, and the bridge has diseases of different degrees from the bridge deck system, the upper structure to the lower structure and the like, so that the requirement of dismantling the bridge appears.
The conventional bridge structure demolishing method mainly comprises mechanical crushing demolishing, blasting, cutting, decomposing and hoisting. Mechanical dismantling, such as pneumatic crushing and large-scale mechanical crushing, has the advantages of less technical investment and shorter construction period, but has great environmental pollution in the construction process and is easy to generate certain impact on a reserved structure. The blasting construction period is short, but a certain safety distance is required to be kept between the blasting construction period and surrounding buildings, the social influence is large, the pollution to nearby air is particularly large after blasting, and meanwhile, the blasting construction needs to carry out strict safety and traffic control on a construction site. The concrete cutting demolition noise is low, the air pollution is low, and the reserved structure is not damaged. Compared with the traditional bridge crushing and dismantling technology, the reinforced concrete cutting and dismantling technology has high requirements on the protection of the surrounding environment and has obvious advantages on the protective dismantling of part of the reserved structure.
The main bridge dismantling is a key point and a difficult point of old bridge dismantling construction, a main bridge continuous rigid frame spans a main channel, a construction scheme needs to be selected and formulated, and the construction scheme needs to be formulated by comprehensively considering all aspects of safety, quality, environmental protection and economy in combination with the actual situation of a site.
In the prior art, the dismantling of the T-structure cantilever box girder of the main bridge generally adopts:
firstly, floating crane, cutting section by section and transporting to a flat barge;
A. because the box girder section is hoisted by the floating crane, the channel is occupied, the difficulty of channel traffic relief is increased, the risk of ship collision is increased, and the construction safety is poor.
B. The limit of only one lifting point can be arranged, the single-point dismantling can be realized, and the relative construction period is long.
C. The floating crane is adopted for dismantling, a large-tonnage floating crane needs to be leased for a long time, the lease unit price on the market is higher, a channel needs to be occupied when the floating crane is used for berth hoisting, and the channel maritime affair cost is higher.
Secondly, arranging a cable crane on the top of the side span pier of the approach bridge, cutting the cable crane section by section, and longitudinally moving the cable crane to a lowering area for lowering;
A. a cable crane with a large span is needed, which has the advantage that the cutting blocks are longitudinally moved, so that the influence on the navigation channel can be reduced to the maximum extent, but the cable crane stands on the bridge floor and has large vertical force on the lower structure. When the bridge condition is poor, the weight cannot be borne, and the structural safety cannot be guaranteed.
B. The limit of only one lifting point can be arranged, the single-point dismantling can be realized, and the relative construction period is long.
C. The large-span cable crane is needed, the cable sling tower structure is very heavy, and the entering and exiting cost and the assembling and disassembling cost are high.
Disclosure of Invention
The invention aims to provide a light bridge-dismantling crane system and a construction method thereof, and aims to solve the technical problems that the stability of a structure during dismantling construction, the construction period and safety, the adaptability and the economical efficiency of a crane and the like are affected by the existing bridge-dismantling equipment in the existing cutting scheme.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light-duty bridge-dismantling crane system comprises a bridge deck structure and four light-duty bridge-dismantling cranes fixedly connected on the bridge deck structure, wherein the bridge deck structure comprises a main bridge T-structure cantilever box girder, the light-duty bridge-dismantling crane comprises a steel truss structure, a hoisting pulley block and a winch,
the main bridge T constructs the cantilever box girder and includes No. 0 piece and cantilever beam section, the cantilever beam section includes bilateral symmetry's section of waiting to tear open and the section of not tearing open, and every section of not tearing open is along the steel truss structure of two components of a whole that can function independently settings of cross-bridge to the symmetry installation, the hoist also corresponds two on No. 0 piece, corresponds respectively on the extension line of the two steel truss structures of both sides, the hoist engine is located steel truss structure's dead back, and the wire rope of hoist engine turns to through the fixed point and is connected to the hoist and mount assembly pulley on, the last hoist and mount assembly pulley of having twined the hoisting cable, the bottom fixedly connected with of hoist and mount assembly pulley breaks out.
The steel truss structure comprises a base, a column, a front compression bar, a rear pull rod, an upper longitudinal beam and a transverse connecting rod,
the base is a rectangular frame, the front pressure lever and the rear pull rod are inclined towards the front side, the bottom of the front pressure lever is fixedly connected to the front two-angle position of the rectangular frame, the bottom of the rear pull rod is in pin connection with the rear two-angle position of the rectangular frame, the stand column is vertically arranged, the bottom of the stand column is located on the rear side of the bottom of the front pressure lever and is fixedly connected to the rectangular frame, the top of the stand column is located on the front side of the top of the rear pull rod, the top of the stand column, the top of the rear pull rod and the top of the front pressure lever are horizontally parallel and level, the upper longitudinal beam is sequentially connected with the tops of the stand column, the front pressure lever and the upper longitudinal beam, and the rear pull rod.
At least one column transverse link rod is connected between the columns, at least two front pressure rod transverse link rods are connected between the front pressure rods, hooks are fixedly connected to the front side end of the upper longitudinal beam and the front side of the top of the front pressure rod, a lifting pulley block vertically downwards hangs on the hooks, and fixed points are fixedly connected to the middle of a front side frame of the base.
The upright post, the front pressure lever and the rear pull rod are splayed combined rods formed by two rod pieces.
The top beam is formed by connecting two longitudinal beams which are parallel in parallel and two cross beams which are connected between the two longitudinal beams,
the splayed combined rods of the upright post, the front pressure rod and the rear pull rod are respectively connected with the two longitudinal beams.
The base is formed by connecting two vertical rods and two transverse rods, and the fixed point is located in the middle of the upper side of the transverse rod on the front side.
The hook is located in the middle of the lower side of the cross beam on the front side.
The bottom rear sides of the base, the upright post and the rear pull rod are anchor points fixed by an anchor bolt of the bridge dismantling machine, and base anchoring holes are formed in the anchor points.
A construction method applying a light bridge-dismantling crane system is characterized in that the light bridge-dismantling crane is assembled on a bridge floor by matching a truck crane, and the method comprises the following steps:
the method comprises the following steps: connecting two longitudinal rods and a transverse rod with a rectangular frame to form a base, and connecting the assembled base with a beam section through a bridge dismantling machine anchor bolt which penetrates through an anchoring hole of a bridge dismantling machine, wherein the bridge dismantling machine anchor bolt comprises a screw rod and a screw cap, and the screw rod is finish-rolled deformed steel;
mounting an upright post and a rear pull rod on the base, mounting a bolt and a safety pin, and temporarily supporting between the rear pull rod and the base; the anchoring hole of the light bridge-dismantling crane is the position of the hoisting point of the light bridge-dismantling crane determined according to the central position of the beam section, and then the position of the light bridge-dismantling crane and the anchoring hole of the light bridge-dismantling crane are determined according to the position of the hoisting point;
step three, continuously installing a front pressure lever on the base, and performing another temporary support between the front pressure lever and the section to be disassembled;
fourthly, longitudinal beams are installed at the upper ends of the rear pull rod, the upright post and the front pressure rod together, a hoisting pulley block is installed, and then a transverse link rod is installed;
fifthly, installing a winch on the No. 0 block to pull a steel wire rope;
and step six, after one beam section is constructed, the light bridge girder dismantling crane is moved to the right position, the bottom seat is leveled by a steel plate, a hole is formed in the top plate of the box girder by a drilling machine according to the designed position of the anchoring hole of the bridge girder dismantling crane on the next beam section, an anchor rod penetrates into the hole, then a torque wrench is used for screwing the nut of the anchor rod on the upper side of the beam section, and the base of the light bridge girder dismantling crane is anchored with the next beam section.
According to the construction method applying the light bridge-dismantling crane system, the light bridge-dismantling crane is dismantled on a bridge floor by utilizing the cooperation of a truck crane, and the steps are as follows:
the method comprises the following steps: firmly anchoring each anchor point of the light bridge-dismantling crane, and dismantling the steel wire rope and the hoisting pulley block;
step two: removing the longitudinal beam and the transverse connecting rod;
step three: dismantling the front compression bar, the upright post and the rear pull rod;
step four: dismantling the base, wherein the anchor points comprise a front anchor point and a rear anchor point, lifting the hoisting pulley block to the highest position, dismantling the anchor bolt corresponding to the front anchor point, then dismantling the anchor bolt corresponding to the rear anchor point, and loosening the screw cap by using a jack when dismantling the anchor bolt;
step five: when the light bridge-dismantling crane travels, the two vertical rods of the base are symmetrically pulled by the two chain blocks, the chain blocks are synchronously tightened, the light bridge-dismantling crane slides to a designated position, and finally the position of the light bridge-dismantling crane is adjusted by the chain blocks.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the light bridge-dismantling crane system is ingenious in design, light in self weight, particularly suitable for bridge dismantling with serious diseases and incapable of bearing heavy equipment, good in economy, capable of enabling the light bridge-dismantling crane to be synchronously arranged to descend and dismantle even if an old bridge is provided with a plurality of cantilever sections, and short in relative construction period.
The light bridge-dismantling crane system adopted by the invention is light and flexible in design, and a single crane is of a self-stabilizing structure under the working condition without load, so that the crane can conveniently move longitudinally and transversely. In the bridge dismantling process, two bridge deck cranes are adopted on the same cross section, and the hoisting pre-tightening force can be effectively adjusted when the cutting progress of the webs on the two sides is different in the bridge dismantling process.
The winch of the bridge deck crane is anchored on the upper side of the No. 0 block, namely the pier top, and an operator is also positioned on the pier top, so that the operator is prevented from being directly positioned on the block section to be disassembled, and the construction safety can be effectively improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a side view of a light-weight bridge-dismantling crane along the bridge direction.
Fig. 2 is a side view schematic of a lightweight demolition crane.
Fig. 3 is a schematic top view of a steel truss structure.
Fig. 4 is a schematic top view of the base.
Fig. 5 is a schematic cross-bridge structure of the upright post.
Fig. 6 is a schematic top view of the header.
FIG. 7 is a schematic top view of the lightweight demolition crane system of the present invention.
Fig. 8 is a schematic view of a step in installing the lightweight demolition crane.
Fig. 9 is a schematic view of the second step in installing the lightweight demolition crane.
Fig. 10 is a schematic view of the third step in the lightweight demolition crane.
Fig. 11 is a schematic view of step four of the lightweight demolition crane.
Fig. 12 is a schematic top view of the structure of fig. 11.
Reference numerals: 1-base, 1 a-longitudinal rod, 1 b-transverse rod, 2-upright post, 3-front compression bar, 4-rear pull rod, 5-top beam, 51-longitudinal beam, 52-transverse beam, 6-winch, 7-steel wire rope, 8-fixed point, 9-hoisting pulley block, 10-heavy cable, 11-shackle, 12-hook, 13-fixed connection, 14-bridge girder dismantling machine anchor bolt, 15-pin joint, 16-0 number block, 17-to-be-dismantled section, 18-unremoved section, 19-front compression bar transverse link rod, 20-base anchoring hole, 21-upright post transverse link rod, 22-temporary support, 23-front anchoring point and 24-rear anchoring point.
Detailed Description
Embodiments referring to fig. 1 to 7, a light-weight bridge dismantling crane system includes a bridge deck structure including a main bridge T-structure cantilever box girder, and four light-weight bridge dismantling cranes fixedly connected to the bridge deck structure, including a steel truss structure, a hoisting pulley block, and a winch.
The main bridge T constructs the cantilever box girder and includes No. 0 piece 16 and cantilever beam section, the cantilever beam section includes bilateral symmetry's section 17 of waiting to tear open and does not tear open section 18, and every section 17 of not tearing open is along the steel truss structure of two components of a whole that can function independently settings of cross-bridge to the symmetry installation, hoist engine 6 also corresponds two installations, corresponds respectively on No. 0 piece 16 on the extension line of two steel truss structures of both sides, hoist engine 6 is located the steel truss structure dead astern, and the wire rope 7 of hoist engine turns to through fixed point 8 and is connected to on the hoist and mount assembly pulley 9, around having hoist cable 10 on the hoist and mount assembly pulley, the bottom fixedly connected with of hoist and mount assembly pulley breaks out 11.
The steel truss structure comprises a base 1, a stand column 2, a front pressure rod 3, a rear pull rod 4, an upper longitudinal beam 5 and a transverse connecting rod.
The base 1 is a rectangular frame, the front compression bar 3 and the rear pull bar 4 are inclined towards the front side, the bottom of the front compression bar 3 is fixedly connected with 13 at the front two angular positions of the rectangular frame, the bottom of the rear pull bar 4 is in pin joint with 15 at the rear two angular positions of the rectangular frame, the upright post 2 is vertically arranged, the bottom of the upright post 2 is positioned at the rear bottom of the front compression bar 3, the fixed connection 13 is arranged on the rectangular frame, the top of the upright post 2 is positioned at the front top of the rear pull bar 4, the tops of the upright post 2, the rear pull bar 4 and the front compression bar 3 are horizontally parallel and level, the upper longitudinal beam 5 is sequentially connected with the tops of the front compression bar 3, the upright post 2 and the upper longitudinal beam are fixedly connected with 13, and the rear pull bar 4 and the upper longitudinal beam are in pin.
At least one column transverse connecting rod 21 is connected between the columns 2, at least two front pressure rod transverse connecting rods 19 are connected between the front pressure rods 3, hooks 12 are fixedly connected to the front side end portions of the upper longitudinal beams 5 and the front sides of the tops of the front pressure rods, lifting pulley blocks 9 hanging downwards are hung on the hooks 12, and fixed points 8 are fixedly connected to the middles of front side frames of the base 1.
The upright post 2, the front pressure lever 3 and the rear pull rod 4 are splayed combined rods formed by two rod pieces.
The top beam 5 is formed by connecting two parallel longitudinal beams 51 and two cross beams 52 connecting the two longitudinal beams 51,
the splayed combined rods of the upright post 2, the front pressure rod 3 and the rear pull rod 4 are respectively connected with two longitudinal beams 51.
The base 1 is formed by connecting two vertical rods 1a and two cross rods 1b, and the fixed point 8 is positioned in the middle of the upper side of the cross rod 1b on the front side.
The hook 12 is located in the middle of the underside of the front cross member 52.
The bottom rear sides of the base 1, the upright post 2 and the rear pull rod 4 are anchor points fixed by an anchor bolt 14 of the bridge dismantling machine, and base anchoring holes 20 are formed in the anchor points.
Referring to fig. 8-12, in the construction method using the light bridge girder dismantling crane system, the light bridge girder dismantling crane is assembled on the bridge floor by using the truck crane cooperation, and the steps are as follows:
the method comprises the following steps: referring to fig. 8, two longitudinal rods 1a and a transverse rod 1b are connected with a rectangular frame to form a base 1, the assembled base 1 is connected with a beam section through a bridge dismantling machine anchor bolt 14, the bridge dismantling machine anchor bolt 14 penetrates through a bridge dismantling machine anchor hole, the bridge dismantling machine anchor bolt comprises a screw rod and a nut, and the screw rod is finish-rolled deformed steel bar.
Step two, as shown in fig. 9, installing the upright post 2 and the rear pull rod 4 on the base 1, installing the bolt and the safety pin, and making a temporary support 22 between the rear pull rod 4 and the base 1; the anchoring hole of the light bridge-dismantling crane is the position of the hoisting point of the light bridge-dismantling crane determined according to the central position of the beam section, and then the position of the light bridge-dismantling crane and the anchoring hole of the light bridge-dismantling crane are determined according to the position of the hoisting point.
And step three, referring to fig. 10, continuing to mount the front pressing rod 3 on the base 1, and making another temporary support 22 between the front pressing rod 3 and the section to be dismantled 17.
And step four, as shown in the figures 11-12, the longitudinal beam 51 is installed at the upper ends of the rear pull rod 4, the upright post 2 and the front press rod 3 together, the hoisting pulley block 9 is installed, and then the cross connection is installed.
And step five, installing a winch 6 on the No. 0 block 16 to pull the steel wire rope 7.
And step six, after one beam section is constructed, the light bridge girder dismantling crane is moved to the right position, the bottom seat is leveled by a steel plate, a hole is formed in the top plate of the box girder by a drilling machine according to the designed position of the anchoring hole of the bridge girder dismantling crane on the next beam section, an anchor rod penetrates into the hole, then a torque wrench is used for screwing the nut of the anchor rod on the upper side of the beam section, and the base of the light bridge girder dismantling crane is anchored with the next beam section.
According to the construction method applying the light bridge-dismantling crane system, the light bridge-dismantling crane is dismantled on a bridge floor by utilizing the cooperation of a truck crane, and the steps are as follows:
the method comprises the following steps: and (3) firmly anchoring each anchor point of the light bridge-dismantling crane, and dismantling the steel wire rope 7 and the hoisting pulley block 9.
Step two: the side members 51 and the cross links are removed.
Step three: and removing the front pressure lever 3, the upright post 2 and the rear pull rod 4.
Step four: demolish base 1, the anchor point includes preceding anchor point 23 and back anchor point 24, promotes hoist and mount assembly pulley 9 to the highest position, tears the crab-bolt that corresponds earlier in the front side anchor point, tears the crab-bolt that corresponds again in the back side anchor point again, draws the loose nut with the jack earlier when demolising the crab-bolt.
Step five: when the light bridge-dismantling crane travels, the two vertical rods of the base are symmetrically pulled by the two chain blocks, the chain blocks are synchronously tightened, the light bridge-dismantling crane slides to a designated position, and finally the position of the light bridge-dismantling crane is adjusted by the chain blocks.
Claims (10)
1. The utility model provides a light-duty bridge crane system of tearing open which characterized in that: comprises a bridge deck structure and four light-duty bridge dismantling cranes fixedly connected on the bridge deck structure, wherein the bridge deck structure comprises a main bridge T-structure cantilever box girder, the light-duty bridge dismantling cranes comprise a steel truss structure, a hoisting pulley block and a winch,
the main bridge T constructs cantilever box girder includes No. 0 piece (16) and cantilever beam section, the cantilever beam section includes bilateral symmetry's section (17) of waiting to tear open and do not tear open section (18), and every section (17) of not tearing open installs the steel truss structure that two components of a whole that can function independently set up along the cross-bridge, hoist engine (6) also correspond two installations, correspond respectively on No. 0 piece (16) on the extension line of two steel truss structures of both sides, hoist engine (6) are located the dead astern of steel truss structure, and wire rope (7) of hoist engine turn to be connected to on hoisting assembly (9) through fixed point (8), around having hoisting cable (10) on the hoisting assembly, the bottom fixedly connected with of hoisting assembly breaks out (11).
2. The lightweight break bridge crane system of claim 1 further comprising: the steel truss structure comprises a base (1), upright posts (2), a front pressure rod (3), a rear pull rod (4), an upper longitudinal beam (5) and a transverse connecting rod,
the base (1) is a rectangular frame, the front pressure lever (3) and the rear pull rod (4) are both inclined towards the front side, the bottom of the front pressure lever (3) is fixedly connected (13) at the front two angular positions of the rectangular frame, the bottom of the rear pull rod (4) is pinned with pins (15) at the rear two angular positions of the rectangular frame, the upright post (2) is vertically arranged, the bottom of the upright post (2) is positioned at the rear side of the bottom of the front pressure lever (3), and is fixedly connected (13) on the rectangular frame, and the top of the upright post (2) is positioned at the front side of the top of the rear pull rod (4), the tops of the upright post (2), the rear pull rod (4) and the front press rod (3) are level and level, the upper longitudinal beam (5) is sequentially connected with the tops of the upright post, the rear pull rod and the front press rod, wherein the upright post (2) and the front compression bar (3) are fixedly connected with the upper longitudinal beam (13), and the rear pull rod (4) is in pin joint with the upper longitudinal beam (15).
3. The lightweight break bridge crane system of claim 2 further comprising: at least one column transverse connecting rod (21) is connected between the columns (2), at least two front pressure rod transverse connecting rods (19) are connected between the front pressure rods (3), the front side end of the upper longitudinal beam (5) and the top front side of the front pressure rods are fixedly connected with hooks (12), a downward vertical hoisting pulley block (9) is hung on the hooks (12), and a fixed point (8) is fixedly connected in the middle of a front side frame of the base (1).
4. The lightweight break bridge crane system of claim 3 further comprising: the upright post (2), the front pressing rod (3) and the rear pull rod (4) are splayed combined rods formed by two rod pieces.
5. The lightweight break bridge crane system of claim 3 further comprising: the top beam (5) is formed by connecting two parallel longitudinal beams (51) and two cross beams (52) connecting the two longitudinal beams (51),
the splayed combined rods of the upright post (2), the front pressure rod (3) and the rear pull rod (4) are respectively connected with two longitudinal beams (51).
6. The lightweight break bridge crane system of claim 2 further comprising: the base (1) is formed by connecting two vertical rods (1 a) and two transverse rods (1 b), and the fixed point (8) is positioned in the middle of the upper side of the transverse rod (1 b) on the front side.
7. The lightweight break bridge crane system of claim 5 further comprising: the hook (12) is located in the middle of the lower side of the front cross beam (52).
8. The lightweight break bridge crane system of claim 2 further comprising: the bottom rear sides of the upper part of the base (1), the upright post (2) and the rear pull rod (4) are anchor points fixed by an anchor bolt (14) of the bridge dismantling machine, and base anchoring holes (20) are formed in the anchor points.
9. A construction method using the light dismantling crane system of claims 3 to 8, wherein the light dismantling crane is assembled on the bridge deck by using truck-mounted crane, and the steps are as follows:
the method comprises the following steps: connecting two longitudinal rods (1 a) and a transverse rod (1 b) with a rectangular frame to form a base (1), and connecting the assembled base (1) with a beam section in an anchoring manner through an anchor bolt (14) of a bridge dismantling machine, wherein the anchor bolt (14) of the bridge dismantling machine penetrates through an anchoring hole of the bridge dismantling machine and comprises a screw rod and a nut, and the screw rod is finish-rolled deformed steel bar;
secondly, mounting the upright post (2) and the rear pull rod (4) on the base (1), mounting a bolt and a safety pin, and making a temporary support (22) between the rear pull rod (4) and the base (1); the anchoring hole of the light bridge-dismantling crane is the position of the hoisting point of the light bridge-dismantling crane determined according to the central position of the beam section, and then the position of the light bridge-dismantling crane and the anchoring hole of the light bridge-dismantling crane are determined according to the position of the hoisting point;
step three, continuously installing a front pressure lever (3) on the base (1), and making another temporary support (22) between the front pressure lever (3) and the section (17) to be disassembled;
fourthly, the longitudinal beam (51) is installed at the upper ends of the rear pull rod (4), the upright post (2) and the front press rod (3) together, the hoisting pulley block (9) is installed, and then the transverse connecting rod is installed;
fifthly, installing a winch (6) on the No. 0 block (16) and well pulling the steel wire rope (7);
and step six, after one beam section is constructed, the light bridge girder dismantling crane is moved to the right position, the bottom seat is leveled by a steel plate, a hole is formed in the top plate of the box girder by a drilling machine according to the designed position of the anchoring hole of the bridge girder dismantling crane on the next beam section, an anchor rod penetrates into the hole, then a torque wrench is used for screwing the nut of the anchor rod on the upper side of the beam section, and the base of the light bridge girder dismantling crane is anchored with the next beam section.
10. A construction method using the light dismantling crane system of claims 3 to 8, wherein the light dismantling crane is dismantled from the deck by means of truck-mounted crane, and the steps are as follows:
the method comprises the following steps: firmly anchoring each anchor point of the light bridge-dismantling crane, and dismantling the steel wire rope (7) and the hoisting pulley block (9);
step two: dismantling the longitudinal beam (51) and the cross connecting rod;
step three: dismantling the front compression bar (3), the upright post (2) and the rear pull rod (4);
step four: dismantling the base (1), wherein the anchor points comprise a front anchor point (23) and a rear anchor point (24), lifting the hoisting pulley block (9) to the highest position, dismantling the anchor bolt corresponding to the front anchor point, then dismantling the anchor bolt corresponding to the rear anchor point, and loosening the nut by using a jack when dismantling the anchor bolt;
step five: when the light bridge-dismantling crane travels, the two vertical rods of the base are symmetrically pulled by the two chain blocks, the chain blocks are synchronously tightened, the light bridge-dismantling crane slides to a designated position, and finally the position of the light bridge-dismantling crane is adjusted by the chain blocks.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113356082A (en) * | 2021-07-16 | 2021-09-07 | 中国十九冶集团有限公司 | Method for dismantling steel cofferdam for bridge construction water retaining |
| CN113802478A (en) * | 2021-10-29 | 2021-12-17 | 合肥工业大学 | Arch bridge deck structure demolishs device based on arch rib supports atress |
| CN113882281A (en) * | 2021-11-16 | 2022-01-04 | 中国建筑第四工程局有限公司 | Hanging basket walking system for bridge cantilever construction and operation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356082A (en) * | 2021-07-16 | 2021-09-07 | 中国十九冶集团有限公司 | Method for dismantling steel cofferdam for bridge construction water retaining |
| CN113802478A (en) * | 2021-10-29 | 2021-12-17 | 合肥工业大学 | Arch bridge deck structure demolishs device based on arch rib supports atress |
| CN113802478B (en) * | 2021-10-29 | 2022-08-02 | 合肥工业大学 | Arch bridge deck structure demolishs device based on arch rib supports atress |
| CN113882281A (en) * | 2021-11-16 | 2022-01-04 | 中国建筑第四工程局有限公司 | Hanging basket walking system for bridge cantilever construction and operation method |
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