CN113026583A - Hoisting and dismantling method for variable cross-section prestressed continuous box girder bridge floor crane - Google Patents
Hoisting and dismantling method for variable cross-section prestressed continuous box girder bridge floor crane Download PDFInfo
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- CN113026583A CN113026583A CN202110254511.6A CN202110254511A CN113026583A CN 113026583 A CN113026583 A CN 113026583A CN 202110254511 A CN202110254511 A CN 202110254511A CN 113026583 A CN113026583 A CN 113026583A
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- hoisting
- section
- variable cross
- box girder
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
Abstract
A variable cross-section prestress continuous box girder bridge deck crane hoisting and dismantling method comprises the following steps: step 10, conveying a plurality of members forming the bridge deck crane to a construction site; step 20, assembling in sequence; step 30, drilling a hoisting hole on the bridge deck; step 40, setting a cutting line; step 50, cutting the beam section along the cutting line by using a wire saw; step 60, controlling the winch to lower the beam section, and commanding the beam transport ship to carry the lowered beam section; and step 70, moving the bridge deck crane backwards to the next station until all the beam sections are dismantled. The invention has the following beneficial effects: the hoisting and dismantling method of the variable cross-section prestressed continuous box girder bridge floor crane has reasonable design, and improves the dismantling efficiency through component preassembly and field installation; the rope saw static force is adopted for cutting and dismantling, the problems of vibration, noise, dust and other environmental pollution in the conventional dismantling construction process are solved, and the cutting surface is flat, is beneficial to separation operation and can continuously operate.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of bridge deck hoisting, in particular to a variable cross-section prestress continuous box girder bridge deck crane hoisting and dismantling method.
[ background of the invention ]
In recent years, under the background of rapid development of urbanization in China, road traffic infrastructure is gradually perfected, and highway engineering projects are gradually increased. However, as the service life of some highways increases, the requirements of safe traffic cannot be met, and therefore, reconstruction and extension projects must be implemented on the original basis. In the reconstruction and expansion project of the expressway, although the application of the bridge dismantling technology is common, the experience of bridge dismantling of the variable cross-section prestress continuous box girder is few and few.
[ summary of the invention ]
The invention aims to provide a hoisting and dismantling method for a variable cross-section prestress continuous box girder bridge deck crane.
The purpose of the invention is realized by the following technical scheme:
a variable cross-section prestress continuous box girder bridge deck crane hoisting and dismantling method comprises the following steps:
and step 70, moving the bridge deck crane backwards to the next station, and returning to the step 30 until all the beam sections are dismantled.
In one embodiment, in step 40, the cutting line is 20cm away from the anchored prestressed steel beam of the uncut beam segment.
In one embodiment, the hoisting holes and the cutting lines are arranged at a distance of 40 mm.
In one embodiment, in step 30, the steel wire rope passes through the hoisting hole and hoists the bottom of the beam segment to be cut.
In one embodiment, the beam segments are cut in step 50 using a diamond wire, a wire saw fixed to the deck with its edge aligned with the cut line, and a guide wheel from which the diamond wire is routed to cut the beam segments along the cut line.
In one embodiment, a safety guard rail or a safety sign is arranged in front of the moving direction of the diamond rope.
In one embodiment, the wire saw is secured to the deck using a chemical anchor.
In one embodiment, the diamond wire is turned to cut the beam segment.
In one embodiment, the hoisting holes are drilled in the deck using a water drill in step 30.
In one embodiment, in step 60, after the section is lowered to a distance of 1.5 meters from the water surface and hovers for at least 2 minutes, the girder transport vessel is instructed to receive the lowered beam section.
Compared with the prior art, the invention has the following beneficial effects: the hoisting and dismantling method of the variable cross-section prestressed continuous box girder bridge floor crane has reasonable design, and improves the dismantling efficiency through component preassembly and field installation; the rope saw static force is adopted for cutting and dismantling, the problems of vibration, noise, dust and other environmental pollution in the conventional dismantling construction process are solved, and the cutting surface is flat, is beneficial to separation operation and can continuously operate.
[ description of the drawings ]
FIG. 1 is a schematic flow chart of a hoisting and dismantling method of a variable cross-section prestressed continuous box girder bridge deck crane of the invention;
FIG. 2 is a structural schematic view of a variable cross-section prestressed continuous box girder bridge deck dismantling crane of the invention;
FIG. 3 is a schematic view of a bridge deck hanger structure for dismantling a variable cross-section prestressed continuous box girder bridge deck according to the invention;
FIG. 4 is a schematic view of the operation of the variable cross-section prestressed continuous box girder bridge deck dismantling crane of the present invention;
FIG. 5 is a schematic structural view of a crane anchoring assembly for dismantling the deck of the variable cross-section prestressed continuous box girder according to the present invention.
[ detailed description ] embodiments
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the scope of the present application. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of the feature. In the description of the invention of the present application, "a plurality" means two or more unless otherwise specified.
Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
A variable cross-section prestress continuous box girder bridge deck crane hoisting and dismantling method comprises the following steps:
and step 70, moving the bridge deck crane backwards to the next station, and returning to the step 30 until all the beam sections 3 are dismantled.
In one embodiment, the stay rod assembly comprises a middle stay 30, a rear stay 40 and a front stay 20, and the bridge deck crane components are assembled after being transported to the site, wherein the assembly sequence is that the base 10, the anchoring beam, the middle stay 30, the rear stay 40, the front stay 20, the main beam 50, the winch and the hoisting accessory are arranged. The base 10, the middle stay bar 30, the rear pull bar 40, the front stay bar 20 and the main beam 50 are connected by flanges, and the base 10 is anchored on the box girder through an anchoring beam and an anchoring rod piece, namely finish-rolled deformed steel bar.
In one embodiment, the cutting line is 20cm from the anchored prestressed steel strand of the uncut beam segment 3 in step 40. Because each section of box girder is cast and molded and then tensioned and prestressed in batches for anchoring, in order to ensure the safety of demolition construction, the anchoring prestressed steel beams of the uncut girder sections 3 cannot be damaged in the cutting process, the distance between the anchorage of each batch of tensioning and anchoring and the joint 2 is about 10 cm-12 cm, and the distance between the cutting joint 1 of each cutting girder and the joint 2 is set to be 20 cm.
In one embodiment, the hoisting holes and the cutting lines are arranged at a distance of 40 mm. The variable cross-section prestressed continuous box girder bridge is prestressed in three directions, hoisting holes need to be kept away from the positions of prestressed steel bundles, the hoisting holes are arranged and arranged according to the prestressed steel bundles of each girder section 3, the transverse bridge positions of the hoisting holes are kept unchanged, and the distance from the cutting seams to 1 is set at an interval of 40 cm.
In one embodiment, in step 30, the steel wire rope 70 is passed through the hoisting hole and hoisted to the bottom of the beam section 3 to be cut.
In one embodiment, the beam segments 3 are cut 50 using a diamond wire, a wire saw fixed to the deck, and a guide wheel having an edge aligned with the cut line, the diamond wire being routed from the wire saw and guided by the guide wheel to cut the beam segments 3 along the cut line.
In one embodiment, a safety guard rail or a safety sign is arranged in front of the moving direction of the diamond rope.
In one embodiment, the rope saw is secured to the deck using a chemical anchor.
In one embodiment, a diamond wire is turned around the cutting beam segment 3.
The rope saw cutting belongs to static cutting and dismantling, solves the problems of vibration, noise, dust and other environmental pollution in the conventional dismantling construction process, and has flat cutting surface, is beneficial to separation operation and can be operated continuously. Therefore, the method for cutting and dismantling by using the diamond rope saw comprises the following steps:
1) fixing the wire saw and the guide wheel: the main foot rest and the auxiliary foot rest of the rope saw are fixed by using an M16 chemical anchor bolt, the installation of a guide wheel must be stable, the edge of the wheel must be aligned with a cutting line, and the installation precision requirement is strictly executed.
2) Installing a rope: according to the determined cutting form, the diamond rope is wound on the driving wheel and the auxiliary wheel in a certain sequence, and the direction of the rope is consistent with the driving direction of the driving wheel.
3) The connection and safety protection technical measures of the related operating system are as follows: according to the field situation, the connection of related pipelines such as water, electricity and mechanical equipment is required to be correct, standard and relatively centralized, and the wiring arrangement strictly executes safe operation rules, so that the potential accident hazard caused by multiple machines and people, and the disordered arrangement and disordered arrangement of auxiliary equipment and materials is prevented. In the rope cutting process, the front of the rope moving direction must be protected by a safety protection rail, and a safety mark is arranged in a certain area to prompt irrelevant personnel not to enter a construction operation area.
4) Cutting: starting the electric motor, adjusting the lifting tension of the driving wheel through the control panel to ensure that the diamond rope is properly tightened, starting circulating cooling water, starting another electric motor, driving the driving wheel to drive the diamond rope to rotate and cut, closely observing the stability of the base in the cutting process, and adjusting the deviation of the guide wheel at any time to ensure that the cutting rope is in the same plane.
In one embodiment, paint is used for line drawing and positioning of the segment hoisting holes and the cutting lines according to the design positions, a water drill is used for drilling the cutting holes in the middle of the cross section, the size of the formed holes is designed to meet the purpose of penetrating cutting ropes, and the steel wire rope 70 is hoisted by the segment by adopting a pocket bottom.
In one embodiment, a hoisting hole is drilled in the deck using a water drill, step 30.
In one embodiment, the girder transport vessel is instructed to receive the lowering beam section 3 after the section is lowered to a distance of 1.5 meters from the water surface and hovers for at least 2 minutes in step 60.
The segment needs to be combined with engineering practice when being lowered, and the following situations are achieved:
1) section lowering: and (4) lowering the segments by controlling a bridge deck crane winch. Before the sections are placed down, the relevant departments of the channel are informed, the passing ships are reminded of paying attention to safety, the sections are temporarily avoided as much as possible, the sections are placed down to the level of about 1.5 m and are hovered for 2 minutes, after the safety is confirmed, the beam transporting ship is commanded to be in place, the sections are placed down, and after the sections are placed down onto the beam transporting ship safely, the steel wire ropes 70 and the hooks of the bridge deck crane are retracted.
2) Marine transport section: the selected beam transport ship can bear the maximum segment mass, the beam connection is convenient, in addition, the beam transport ship with large tonnage is not selected according to the water depth during construction, so that the beam transport ship is not easy to lean to the shore, and the 200-ton transport ship is selected.
3) Landing the segment: when the river bank is wide and flat in land shape and the water depth of the bank is sufficient, a ground crane can be adopted, otherwise, a ship crane is recommended to be selected, and a 350-ton truck crane is adopted on the bank in combination with the actual engineering.
4) Moving the bridge deck crane backwards: and after the construction of one section is finished, immediately moving the bridge deck crane backwards to the next station, and repeating the steps until all the midspan box girder sections are dismantled.
The embodiment also discloses a crane for dismantling the variable cross-section prestressed continuous box girder bridge floor, which comprises: the bridge deck comprises a base 10, an anchoring assembly 80, a stay bar assembly, a main beam 50, a winch, a hoisting accessory and a steel wire rope 70, wherein the base 10 is anchored on the bridge deck by the anchoring assembly 80, the main beam 50 is erected on the base 10 by the stay bar assembly, the winch is fixed at one end of the main beam 50, the hoisting accessory is fixed at the output end of the winch, the steel wire rope 70 is suspended on the hoisting accessory, and the stay bar assembly is connected with the base 10 and the main beam 50 through flange plates. In this embodiment, the lifting accessory is a hook set.
To improve structural strength, in one embodiment, the main beam 50 is integrally welded to the HM440 type double-piece.
To improve structural strength, in one embodiment, base 10 is integrally formed from HM440 type steel.
To increase the anchoring strength, in one of the embodiments, the anchoring assembly 80 comprises an anchoring beam provided with at least 4 anchoring points and an anchoring bar passing through the anchoring points and fixed to the deck.
In order to improve the anchoring strength, in one embodiment, the anchoring beams are formed by assembling and welding double-spliced steel channels 32b, and each crane has at least 3 anchoring beams. An anchoring beam at the front end plays a role in fixing; the rear two anchoring beams are prevented from overturning when being hoisted, each anchoring beam is anchored by 4 anchoring rod pieces, and 8 anchoring points are provided in total.
In order to improve the anchoring strength, in one embodiment, the anchoring bar is finish-rolled threaded steel JL 32.
In order to improve the anchoring strength, in one embodiment, the anchoring rod piece and the anchoring beam are fixed by double nuts, and the anchoring rod piece is fixed between the bridge bottom and the bridge deck by wedge-shaped steel plates.
In one embodiment, each beam section 3 to be cut is hoisted by at least 8 steel cables 70, and each steel cable 70 has a diameter of at least 43 mm. The maximum segment quality of the midspan is 84.29T, according to the relevant specification requirements, the steel wire rope 70 is selected to meet the safety factor of more than 8 times, a water drill is adopted to drill holes at the designated position of the bridge deck before installation, the size of the formed holes is designed to meet the requirement of threading the steel wire rope 70, and the cutting of prestressed steel strand wires is avoided as much as possible.
In one embodiment, the angle between the steel cords 70 and the deck is 60 °. Each beam section 3 is hoisted by 8 steel wire ropes 70, the hoisting angle is 60 degrees, the stress of each steel wire rope 70 is 84.29T multiplied by 1.2 impact coefficient/8 multiplied by (2/1.732) multiplied by 8 times as large as 116.8T, and the steel wire rope 70 (breaking force 118.5T) with the diameter of 43mm meets the hoisting safety requirement.
In one embodiment, the hoist is a 12t hoist.
And (3) according to the hoisting weight 84.29t of the maximum segmental removed in the midspan of the variable cross-section prestressed continuous box girder, multiplying by a certain safety factor, and thus determining the designed hoisting capacity of the single bridge deck crane to be 100 t. Two or more cranes can be operated simultaneously according to actual needs. Before the variable cross-section prestress continuous box girder midspan segment rope saw cuts, a bridge deck crane is adopted to protect the bottom of a segment steel wire rope 70 pocket, and after the segment cutting is completed, the segment is hoisted and placed by a bridge deck crane hoist so as to complete the midspan segment dismantling.
The embodiment also discloses a bridge deck gallows is demolishd to continuous case roof beam bridge floor of variable cross section prestressing force, includes: base 10, preceding vaulting pole 20, middle vaulting pole 30, back pull rod 40 and girder 50, base 10 is placed on the bridge floor, girder 50 parallel arrangement is in base 10 top, preceding vaulting pole 20, the upper and lower both ends of middle vaulting pole 30 and back pull rod 40 can be dismantled with girder 50 and base 10 respectively and be connected, the vertical setting of middle vaulting pole 30 is on base 10, preceding vaulting pole 20 and the slope of back pull rod 40 set up on base 10, the bottom of preceding vaulting pole 20 and middle vaulting pole 30 is fixed with the one end that base 10 is close to girder 50, the top of middle vaulting pole 30 and back pull rod 40 is fixed with the one end that girder 50 is close to base 10.
For convenient transportation and disassembly, in one embodiment, the upper and lower ends of the front stay 20, the middle stay 30 and the rear stay 40 are respectively flanged with the main beam 50 and the base 10.
In order to increase the structural strength, in one embodiment, the base 10 is a pair of parallel disposed i-beams.
In order to improve the structural strength, in one embodiment, each of the front stay 20, the middle stay 30 and the rear stay 40 has a pair, and the bottom ends of the pair of front stay 20, the middle stay 30 and the rear stay 40 are respectively fixed to a pair of i-shaped steels of the base 10.
To facilitate disassembly and assembly, in one embodiment, a pair of intermediate struts 30 and rear tension rods 40 are each secured at their top ends to the main beams 50.
In order to improve structural strength, in one embodiment, a cross bar 60 is fixed between each of the pair of front stays 20, the intermediate stay 30, and the rear stay 40.
To improve structural strength and save cost, in one embodiment, the cross bar 60 is made of a phi 273 x 8mm steel tube.
In order to improve structural strength and save cost, in one embodiment, the front stay 20, the middle stay 30 and the rear stay 40 are made of steel pipes with a diameter of 273 × 12 mm.
In order to improve the structural strength, in one embodiment, the angle between the rear pull rod 40 and the base 10 is 37-45 °.
To improve structural strength, in one embodiment, the front brace 20 is angled at 19-25 ° to the middle brace 30.
Compared with the prior art, the invention has the following beneficial effects: the hoisting and dismantling method of the variable cross-section prestressed continuous box girder bridge floor crane has reasonable design, and improves the dismantling efficiency through component preassembly and field installation; the rope saw static force is adopted for cutting and dismantling, the problems of vibration, noise, dust and other environmental pollution in the conventional dismantling construction process are solved, and the cutting surface is flat, is beneficial to separation operation and can continuously operate.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A variable cross-section prestress continuous box girder bridge deck crane hoisting and dismantling method is characterized by comprising the following steps:
step 10, transporting a plurality of members forming the bridge deck crane to a construction site, wherein the members at least comprise a base, an anchoring assembly, a tension rod supporting assembly, a main beam, a winch, hoisting accessories and a steel wire rope;
step 20, sequentially assembling the base, an anchoring assembly, a tension rod supporting assembly, a main beam, a winch and a hoisting accessory, wherein the base is anchored on a bridge floor by the anchoring assembly, the main beam is erected on the base by the tension rod supporting assembly, the winch is fixed at one end of the main beam, and the hoisting accessory is fixed with the output end of the winch;
step 30, drilling a hoisting hole in the bridge floor, wherein the steel wire rope penetrates through the hoisting hole and is suspended on the hoisting accessory;
step 40, setting a cutting line, wherein the cutting line is at least 20cm away from the anchoring prestressed steel beam of the uncut beam section;
step 50, cutting the beam section along the cutting line by using a wire saw;
step 60, controlling the winch to lower the beam section, and commanding the beam transport ship to carry the lowered beam section;
and step 70, moving the bridge deck crane backwards to the next station, and returning to the step 30 until all the beam sections are dismantled.
2. The variable cross-section prestressed continuous box girder deck crane hoisting and dismantling method of claim 1, wherein in said step 40, said cutting line is 20cm away from the anchored prestressed steel beam of the uncut girder segment.
3. The variable cross-section prestressed continuous box girder bridge deck crane hoisting and dismantling method according to claim 1, wherein the hoisting holes and the cutting lines are arranged at a distance of 40 mm.
4. The variable cross-section prestressed continuous box girder bridge floor crane hoisting and dismantling method according to claim 1, wherein in the step 30, the steel wire rope passes through the hoisting hole and hoists a to-be-cut beam section pocket bottom.
5. The method for hoisting and dismantling a variable cross-section prestressed continuous box girder bridge floor crane according to claim 1, wherein in step 50, the girder segments are cut by using diamond ropes, a rope saw and guide wheels, wherein the rope saw is fixed on the bridge floor, edges of the guide wheels are aligned with the cutting lines, the diamond ropes are led out from the rope saw, and the girder segments are cut along the cutting lines guided by the guide wheels.
6. The method for hoisting and dismantling a variable cross-section prestressed continuous box girder bridge floor crane according to claim 5, wherein a safety guard rail or a safety sign is arranged in front of the moving direction of the diamond rope.
7. The variable cross-section prestressed continuous box girder bridge deck crane hoisting and dismantling method of claim 5, wherein said rope saw is fixed on the bridge deck using chemical anchor bolts.
8. The variable cross-section prestressed continuous box girder deck crane hoisting demolition method according to claim 5, wherein said diamond rope rotary cuts said girder segments.
9. The variable cross-section prestressed continuous box girder deck crane hoisting and dismantling method according to claim 1, wherein in said step 30, said hoisting holes are drilled on the deck using water drilling.
10. The variable cross-section prestressed continuous box girder bridge deck crane hoisting and dismantling method according to claim 1, wherein in step 60, after the sections are lowered to a position 1.5 meters away from the water surface and suspended for at least 2 minutes, the girder transporting ship is instructed to carry the lowered beam sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254511.6A CN113026583A (en) | 2021-03-09 | 2021-03-09 | Hoisting and dismantling method for variable cross-section prestressed continuous box girder bridge floor crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110254511.6A CN113026583A (en) | 2021-03-09 | 2021-03-09 | Hoisting and dismantling method for variable cross-section prestressed continuous box girder bridge floor crane |
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| CN113026583A true CN113026583A (en) | 2021-06-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201635020U (en) * | 2010-02-08 | 2010-11-17 | 武汉二航路桥特种工程有限责任公司 | Bridge floor dismantling crane for large and medium concrete bridges |
| JP2017020290A (en) * | 2015-07-14 | 2017-01-26 | オリエンタル白石株式会社 | Disassembling method of bridge |
| CN110984006A (en) * | 2020-01-17 | 2020-04-10 | 广东冠粤路桥有限公司 | Method for dismantling cantilever box girder of main bridge T-structure |
| CN111252683A (en) * | 2020-02-28 | 2020-06-09 | 佛山市粤优创钢结构有限公司 | Bridge deck crane and application method thereof applied to bridge dismantling |
| CN111560864A (en) * | 2020-01-17 | 2020-08-21 | 广东冠粤路桥有限公司 | Method for dismantling old bridge |
-
2021
- 2021-03-09 CN CN202110254511.6A patent/CN113026583A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201635020U (en) * | 2010-02-08 | 2010-11-17 | 武汉二航路桥特种工程有限责任公司 | Bridge floor dismantling crane for large and medium concrete bridges |
| JP2017020290A (en) * | 2015-07-14 | 2017-01-26 | オリエンタル白石株式会社 | Disassembling method of bridge |
| CN110984006A (en) * | 2020-01-17 | 2020-04-10 | 广东冠粤路桥有限公司 | Method for dismantling cantilever box girder of main bridge T-structure |
| CN111560864A (en) * | 2020-01-17 | 2020-08-21 | 广东冠粤路桥有限公司 | Method for dismantling old bridge |
| CN111252683A (en) * | 2020-02-28 | 2020-06-09 | 佛山市粤优创钢结构有限公司 | Bridge deck crane and application method thereof applied to bridge dismantling |
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Application publication date: 20210625 |
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