CN111824191A - Method special for transporting assembled box girder of heavy prefabricated arch bridge - Google Patents
Method special for transporting assembled box girder of heavy prefabricated arch bridge Download PDFInfo
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- CN111824191A CN111824191A CN202010671502.2A CN202010671502A CN111824191A CN 111824191 A CN111824191 A CN 111824191A CN 202010671502 A CN202010671502 A CN 202010671502A CN 111824191 A CN111824191 A CN 111824191A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D3/00—Wagons or vans
- B61D3/16—Wagons or vans adapted for carrying special loads
- B61D3/166—Wagons or vans adapted for carrying special loads for carrying very heavy loads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B9/00—Tramway or funicular systems with rigid track and cable traction
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Abstract
The invention provides a method for transporting a heavy prefabricated arch bridge assembled box girder in a remote area. The method comprises the following steps: a. providing two heavy low center of gravity transport vehicles; b. building two steel rails which extend to a destination from the beginning in parallel; c. synchronously mounting two transport vehicles on two steel rails; d. installing a winch on a fixed base of a destination, and connecting a steel wire rope of the winch to two transport vehicles; e. placing the prefabricated arch bridge assembled box girder on two transport vehicles by using a jack; f. and starting the winch, and dragging the two transport vehicles to synchronously move on the two steel rails by the steel wire rope to transport the prefabricated arch bridge assembly box girder to a destination. The invention has the advantages of low cost, simple installation, large transport tonnage, suitability for construction in remote areas, easy disassembly after use, little damage to the environment, strong practicability, obvious economic benefit and the like.
Description
Technical Field
The invention belongs to the field of building engineering, relates to a method for carrying heavy building components in remote areas, and particularly relates to a method special for transporting a box girder assembled by a heavy prefabricated arch bridge.
Background
The large Bigou bridge spans the large Bigou canyon at the upstream of the Cascade power station dam site of the Yangtze river California, and is one of the important structures of the highway engineering special for the hydropower stations of the Kara and Yangtze ditches. The bridge design type is a prefabricated reinforced concrete catenary box type arch bridge. The bridge site is about 370 kilometers away from the Xichang city, wherein 130 kilometers from the Muli county city to the construction site are simple roads between original mountain forests, the bent multiple paths are narrow, only single bridge cars with the length of less than 6 meters can pass through, two mountains with the altitude of more than 3900 meters are needed along the road, the road condition is extremely poor, the bridge site is particularly suitable in winter and rainy seasons, the traffic interruption to the outside is often caused by debris flow and collapse of side slope roadbed, and the traffic and transportation conditions in the construction period are extremely bad. The bridge is located in the great southwest of China and intersects with the mountains, the mountains on the two sides of the bridge are high and steep, and the terrain is dangerous. The bottom of the valley where the bridge is located is 15-20 meters wide, steep hills are arranged on two sides of the gully, the construction condition is extremely severe, and heavy hoisting equipment cannot enter a field at all and is arranged close to the field.
Referring to fig. 10 and 11, this is one example of the case of constructing an arch bridge using the present invention. According to the design, the bridge type is a prefabricated reinforced concrete catenary box type arch bridge, the bridge span arrangement adopts 100+20 meters, the width of a bridge deck is 10 meters, the total length of the bridge is about 135.76 meters, and the bridge is a heavy prefabricated reinforced concrete box type arch bridge (called as a prefabricated box arch for short). The bridge arch ring is composed of 5 rib box arches, each rib box arch is formed by splicing 5 box girders through high-altitude cantilevers, wherein the prefabricated box girders are divided into three types, namely an edge box, a secondary edge box and a middle box, the central axis of the prefabricated box girders is about 21.45-21.95 meters, and the net weight is about 65 tons. The net span of the prefabricated box arch after assembly is about 100 meters, and the net height of the bridge is over 80 meters. The bridge is usually built in remote areas with complex terrain and inconvenient traffic, and large-scale hoisting equipment is usually large in size and heavy in tonnage. In order to convey the large hoisting equipment to a construction site, special road repair is needed, and the large hoisting equipment needs to be dismantled in the future, so that the large hoisting equipment is wasted and is not environment-friendly. Therefore, the use occasions of the large hoisting equipment are reduced as much as possible (or the occasions where the large hoisting equipment must be used are concentrated as much as possible), the mileage of road repair can be reduced as much as possible, the road repair cost is saved beneficially, and meanwhile, the damage to the environment can be reduced. The present invention has been made to solve the above problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a heavy-load low-gravity-center transport vehicle, which successfully transports a prefabricated arch box with the length of 21.5 meters and the weight of 65 tons in a canyon region from a prefabricated region to a hoisting region, and solves the problem of transporting the prefabricated arch box in an on-site field under the condition that heavy hoisting equipment cannot be operated nearby. The rail transport trolley can be used independently, and can also form a train set for transporting other heavy components in short distance.
The technology of the invention adopts two parallel steel rails which are arranged from a prefabrication area to a hoisting area in a through length mode, a load-carrying low-gravity center transport vehicle is installed on the steel rails, an arch box is jacked by a large-tonnage jack, the low-gravity center transport vehicle is moved to the position below the arch box, the jack is collected and falls on the low-gravity center transport vehicle, the box girder is used as a connection beam of the load-carrying rail transport vehicle, and the prefabricated arch box is moved by using a winch to pull the load-carrying rail transport vehicle.
Specifically, one of the objects of the present invention is: the low gravity center transport vehicle comprises a frame made of steel plates and two U-shaped rollers, wherein the two U-shaped rollers are respectively installed at two ends of the frame through shafts and bearings, and the distance between the top of a bearing beam of the frame and the top of the U-shaped rollers is 10-100 mm.
Furthermore, the frame comprises two longitudinal beams which are parallel to each other and a plurality of cross beams which are welded to the two longitudinal beams, the length of each longitudinal beam is 10-100 times of the height of the longitudinal beam, the height of each longitudinal beam is 5-20 times of the thickness of the longitudinal beam, and the U-shaped rollers are arranged between the two longitudinal beams.
Furthermore, the low gravity center transport vehicle also comprises two towing hooks which are respectively positioned at the front end and the rear end of the vehicle frame.
Furthermore, after the two towing hooks are made of round steel, the two towing hooks are respectively welded to the front end and the rear end of the frame
Furthermore, the outer ring of the bearing is nested in the inner ring of the U-shaped roller in an interference fit mode, the inner ring of the bearing is nested in the middle of the shaft in an interference fit mode, and two ends of the shaft are respectively fixed to the two longitudinal beams.
Furthermore, each U-shaped roller is fixedly connected to the middle of the shaft, two ends of the shaft are respectively nested in an inner ring of one bearing in an interference fit manner, and outer rings of the two bearings are respectively and fixedly connected to the two longitudinal beams in an interference fit manner.
Furthermore, key pin grooves are respectively arranged among the contact surfaces of the shaft, the bearing, the U-shaped idler wheel and the longitudinal beam, and key pins are installed in the key pin grooves.
The second purpose of the invention is that: the utility model provides a device of box girder is assembled to heavy prefabricated arched bridge of transportation is exclusively used in, including two rail that are parallel to each other and keep a suitable distance apart from each other, two low gravity center transport vechicles of settling respectively on two rail, fix the hoist engine on the base and connect the hoist engine and the wire rope of two low gravity center transport vechicles, the hoist engine passes through wire rope and pulls two low gravity center transport vechicles synchronous motion on two rail, low gravity center transport vechicles includes frame and two U type gyro wheels made by the steel sheet, two U type gyro wheels pass through axle and bearing and install respectively to the both ends of frame, the distance between the carrier bar top of frame and U type gyro wheel top is between 10-100 millimeters.
Furthermore, the device also comprises an arch box base die for prefabricating the arch bridge assembled box girder, wherein two parallel channels are formed in the arch box base die, and the two steel rails are respectively arranged in the corresponding channels.
Further, the two rails are made of P38 rail steel.
Furthermore, the two low-gravity center transport vehicles are respectively positioned in the two channels, the top of the bearing beam of the frame exceeds the top of the channels by 10-50 mm, and the distance between the side wall of the channel and the side wall of the low-gravity center transport vehicle is 10-50 mm.
Furthermore, the frame comprises two longitudinal beams which are parallel to each other and a plurality of cross beams which are welded to the two longitudinal beams, the length of each longitudinal beam is 10-100 times of the height of the longitudinal beam, the height of each longitudinal beam is 5-20 times of the thickness of the longitudinal beam, and the U-shaped rollers are arranged between the two longitudinal beams.
Furthermore, the vehicle frame further comprises two towing hooks which are respectively positioned at the front end and the rear end of the vehicle frame.
Furthermore, after the two towing hooks are made of round steel, the two towing hooks are respectively welded to the front end and the rear end of the frame.
Furthermore, the outer ring of the bearing is nested in the inner ring of the U-shaped roller in an interference fit mode, the inner ring of the bearing is nested in the middle of the shaft in an interference fit mode, and two ends of the shaft are fixedly connected to the two longitudinal beams respectively.
Furthermore, each U-shaped roller is fixedly connected to the middle of the shaft, two ends of the shaft are respectively nested in an inner ring of one bearing in an interference fit manner, and outer rings of the two bearings are respectively and fixedly connected to the two longitudinal beams in an interference fit manner.
Furthermore, key pin grooves are respectively arranged among the contact surfaces of the shaft, the bearing, the U-shaped idler wheel and the longitudinal beam, and key pins are installed in the key pin grooves.
The third purpose of the invention is: the method is specially used for transporting the assembled box girder of the heavy prefabricated arch bridge, and comprises the following steps: providing two low-gravity center transport vehicles, wherein each low-gravity center transport vehicle comprises a frame made of steel plates and two U-shaped rollers, the two U-shaped rollers are respectively arranged at two ends of the frame through shafts and bearings, and the distance between the top of a bearing beam of the frame and the top of each U-shaped roller is 10-100 mm, and the method comprises the following steps:
the first step is as follows: arranging two parallel channels under a prefabricated arch box base mold for supporting a prefabricated arch bridge assembly box girder;
the second step is that: two parallel steel rails are arranged in the two channels, and the two steel rails extend to a destination from the beginning in parallel;
the third step: respectively installing the two low gravity center transport vehicles on two steel rails and synchronizing the two low gravity center transport vehicles;
the fourth step: mounting a winch to a fixed base at a destination, and connecting free ends of a wire rope on the winch to the two low-center-of-gravity transport vehicles;
the fifth step: lifting the prefabricated arch bridge assembly box girder by using a jack;
and a sixth step: respectively moving two low-gravity center transport vehicles into the two channels, so that the two low-gravity center transport vehicles are positioned right below the prefabricated arch bridge assembly box girder;
the seventh step: the jack is retracted, so that the prefabricated arch bridge assembled box girder falls on two low gravity center transport vehicles;
eighth step: and starting the winch to rotate forwards, and dragging the two low-gravity center transport vehicles to synchronously move on the two steel rails by the steel wire rope until the prefabricated arch bridge assembled box girder is transported to a destination.
Furthermore, the frame comprises two longitudinal beams which are parallel to each other and a plurality of cross beams which are welded to the two longitudinal beams, the length of each longitudinal beam is 10-100 times of the height of the longitudinal beam, the height of each longitudinal beam is 5-20 times of the thickness of the longitudinal beam, and the U-shaped rollers are arranged between the two longitudinal beams.
Furthermore, the vehicle frame further comprises two towing hooks which are respectively positioned at the front end and the rear end of the vehicle frame.
Furthermore, after the two towing hooks are made of round steel, the two towing hooks are respectively welded to the front end and the rear end of the frame.
Furthermore, the outer ring of the bearing is nested in the inner ring of the U-shaped roller in an interference fit mode, the inner ring of the bearing is nested in the middle of the shaft in an interference fit mode, and two ends of the shaft are fixedly connected to the two longitudinal beams respectively.
Furthermore, each U-shaped roller is fixedly connected to the middle of the shaft, two ends of the shaft are respectively nested in an inner ring of one bearing in an interference fit manner, and outer rings of the two bearings are respectively and fixedly connected to the two longitudinal beams in an interference fit manner.
Furthermore, key pin grooves are respectively arranged among the contact surfaces of the shaft, the bearing, the U-shaped idler wheel and the longitudinal beam, and key pins are installed in the key pin grooves.
Further, two rails were made of P38 rail steel.
Further, the method comprises a ninth step of: and a step of unloading the prefabricated arch bridge assembly box girder from the two low-gravity center transport vehicles by using a cable crane at the destination.
Further, the method includes a tenth step of: and starting the winch to reversely rotate, and dragging the two low-gravity center transport vehicles to return to the starting place from the destination by the steel wire rope.
Advantageous effects
The invention adopts the arch bridge assembled box girder prefabricated area to the hoisting area which are inconvenient to transport and have complicated terrain to arrange long steel rails, uses profile steel and steel plates to manufacture a frame, installs U-shaped rollers below the frame to form a low gravity center transport vehicle which can move along the rails, places the prefabricated arch bridge assembled box girder on the two low gravity center transport vehicles, and uses a winch to pull the low gravity center transport vehicle to move, thereby transporting the prefabricated arch bridge assembled box girder from the prefabricated area to the hoisting area. The invention solves the technical problems that large hoisting equipment cannot enter the field for construction due to inconvenient transportation of construction sites, complicated terrain and the like, and small hoisting equipment cannot be constructed due to large size (the span of a single beam is about 21.5 meters) and heavy tonnage (the weight reaches 65 tons) of a single prefabricated arch bridge assembled box girder. Therefore, the invention has the advantages of low cost, simple installation, large transport tonnage, suitability for construction in remote areas, easy disassembly after use, little damage to the environment, strong practicability, obvious economic benefit and the like.
Drawings
FIG. 1 is a perspective view of a low center of gravity transport vehicle according to the present invention;
FIG. 2 is a bottom plan view of FIG. 1;
FIG. 3 is a side schematic view of the low center of gravity transport vehicle of FIG. 1 mounted to a rail;
FIG. 4 is an enlarged, partially schematic top view of the low center of gravity transport vehicle shown in FIG. 1;
FIG. 5 is an enlarged cross-sectional view of the axle, bearings, U-shaped rollers, and stringers of the low center of gravity transport vehicle of FIG. 1 assembled in a first assembly;
FIG. 6 is an enlarged cross-sectional view of the axle, bearings, U-shaped rollers, and stringers of the low center of gravity transport vehicle of FIG. 1 assembled in a second assembly;
FIG. 7 is an enlarged side view of FIG. 6;
FIG. 8 is a schematic plan view of the apparatus for transporting assembled box girders for heavy prefabricated arch bridges according to the present invention;
FIG. 9 is a schematic perspective view of FIG. 8;
FIG. 10 is a schematic perspective view of an arch bridge assembled from 25 prefabricated arch bridge assembled box girders;
fig. 11 is a front plan view of fig. 10.
Reference numerals:
a low center of gravity carrier vehicle 10; a towing hook 11; a frame 20; a longitudinal beam 21; a cross member 22; frame ears 23; a U-shaped roller 30; a U-shaped roller inner ring 31; a shaft 40; a bearing 50; a bearing outer ring 51; a bearing inner ring 52; key pin grooves 53; a key pin 54; a dedicated transport device 100; a rail 110; a hoist 120; a wire rope 130; an arch box base mold 150; a channel 151; the box girder 160.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
As shown in fig. 1-7, one of the objects of the present invention is: a low center of gravity carrier vehicle 10 is provided that is dedicated to transporting heavy precast arch bridge assembled box girders. The low center of gravity carrier vehicle 10 includes a frame 20 made of steel plate and two U-shaped rollers 30. The two U-shaped rollers 30 are respectively mounted to both ends of the frame 20 through the shaft 40 and the bearing 50 (not meaning that the two U-shaped rollers 30 are respectively mounted to the outermost of both ends of the frame 20, but meaning that the two U-shaped rollers 30 are respectively mounted at positions near both ends of the frame 20 as a whole). The distance between the top of the bearing beam of the frame and the top of the U-shaped roller is 10-100 mm, so that the gravity center of the transport vehicle 10 can be lowered, and the stability of movement of the transport vehicle in no-load and loaded states can be improved.
Since the prefabricated arch bridge assembled box girder (referred to as "box girder") 160 weighs about 65 tons, the low gravity center transportation vehicle of the present invention should have sufficient strength. To this end, the frame 20 comprises two mutually parallel longitudinal beams 21 and several transverse beams 22 welded thereto. The frame 20 is made of section steel and steel plates by welding, and the thickness of the section steel and the steel plates should be not less than 10 mm. The height of the longitudinal beam is 5-20 times of the thickness of the longitudinal beam, and the length of the longitudinal beam is 10-100 times of the height of the longitudinal beam. The U-shaped rollers 30 are custom-made and should have a width slightly larger than the width of the chinese railroad rail. The U-shaped rollers 30 are mounted between the two longitudinal beams 21, which is beneficial to improving the stability and strength of the low-center-of-gravity transport vehicle 10. Directly above each U-shaped roller 30, the frame 20 is provided with a frame ear 23, and the width of the frame ear 23 is about 2-3 times of the distance between the two cross beams 22, so that after the box girder 160 is placed on the transportation vehicle 10, the contact area between the box girder 160 and the frame 20 is increased, and the stability of the box girder 160 during transportation is improved.
The low center of gravity carrier 10 also includes two tow hooks 11 located at the front and rear ends of the frame 20, respectively. The two towing hooks are made of round steel and then welded to the front end and the rear end of the frame 20, respectively.
Referring to fig. 5, in one embodiment, the outer ring 51 of the bearing 50 is nested in the inner ring 31 of the U-shaped roller in an interference fit manner, the inner ring 52 of the bearing is nested in the middle of the shaft 40 in an interference fit manner, and two ends of the shaft 40 are respectively fixed to the two longitudinal beams 21 in an interference fit manner, a welding manner or a key pin fit manner.
Referring to fig. 6, in another embodiment, each U-shaped roller 30 is fixedly connected to the middle of the shaft 40 by interference fit, welding or key-pin fit, two ends of the shaft are respectively nested in the inner ring 52 of one bearing by interference fit, welding or key-pin fit, and the outer rings 51 of the two bearings are respectively fixedly connected to the two longitudinal beams 21 by interference fit, welding or key-pin fit. Referring to fig. 6 and 7, key pin grooves 53 are formed between the contact surfaces of the shaft, the bearing, the U-shaped roller and the side member, and key pins 54 are installed in the key pin grooves.
Referring to fig. 8 and 9, another object of the present invention is: there is provided an apparatus (hereinafter, referred to as "dedicated transportation apparatus") 100 for transporting a box girder of a prefabricated arch bridge assembly, which includes two rails 110 parallel to each other and spaced apart from each other at a proper distance, two low gravity center vehicles 10 respectively disposed on the two rails, a winch 120 fixed on a base, and a wire rope 130 connecting the winch and the two low gravity center vehicles. The hoist 120 pulls the two low gravity center vehicles 10 through the wire rope 130 to move synchronously on the two rails 110. The synchronization described in this patent refers to: the two low gravity center carriers 10 are arranged substantially side by side on the two rails 110 such that the center line of the two low gravity center carriers 10 is substantially perpendicular to the direction of elongation of the two rails, rather than being offset from each other by a certain distance. The synchronous movement, the synchronous translation or the synchronous motion described in this patent means: during the process of moving the two low gravity center carriers 10 on the two rails 110, the center connecting line of the two low gravity center carriers 10 is kept approximately perpendicular to the extending direction of the two rails, but not at a certain position staggered with each other. In one embodiment, only one high capacity winch is used to simultaneously and simultaneously tow two low center of gravity vehicles 10 to move synchronously on two rails 110. In another embodiment, one high power winch is used to pull one low center of gravity carrier 10 to move on two rails 110, and the two high power winches should be operated synchronously to pull two low center of gravity carriers to move synchronously on two rails 10.
The structure of the low center of gravity vehicle 10 has been described in detail above and will not be described in detail.
As shown in fig. 8, the special transporting apparatus 100 further includes an arch box base mold 150 for supporting prefabricated arch bridge erection box girders (referred to as "box girders") 160. The arch box base mold 150 is provided with two parallel channels 151, and the two channels 151 are spaced apart by a suitable distance, for example, 15 meters. The two rails 110 are respectively seated in the corresponding channels 151 and fixed to the base. The arc shape of the upper surface of the arch box base mold 150 corresponds to the arc shape of the box girder 160. The two rails 110 are made of P38 rail steel and have an i-shaped cross section.
The third purpose of the invention is: the method is specially used for transporting the assembled box girder of the heavy prefabricated arch bridge, and comprises the following steps: providing two low center of gravity carriers 10 as described above, the method comprising the steps of:
the first step is as follows: arranging two parallel channels 151 under a precast arch box base mold 150 for supporting a precast arch bridge assembled box girder 160;
the second step is that: two parallel steel rails 110 are arranged in the two channels 151, and extend from the beginning to the destination in parallel;
the third step: the two low gravity center transport vehicles 10 are respectively arranged on two steel rails 110 and are synchronized;
the fourth step: mounting the hoist 120 to a fixed base at a destination and connecting free ends of the wire rope 130 on the hoist to the two low gravity center carrier vehicles 10;
the fifth step: jacking the prefabricated arch bridge assembly box girder 160 by using a jack;
and a sixth step: respectively moving the two low-gravity center transport vehicles 10 into the two channels 151, so that the two low-gravity center transport vehicles 10 are positioned right below the prefabricated arch bridge assembly box girder 160;
the seventh step: the jacks are retracted, so that the prefabricated arch bridge assembly box girder 160 falls on the two low gravity center transport vehicles 10;
eighth step: and starting the winch 120 to rotate forwards, and dragging the two low-gravity center transport vehicles 10 to synchronously move on the two steel rails 110 by the steel wire rope 130 until the prefabricated arch bridge assembly box girder 160 is transported to a destination.
As a further improvement of the method, the method further comprises a ninth step of: and (3) unloading the prefabricated arch bridge erection box girders 160 from the two low gravity carriers 10 at the destination by cable cranes (not shown).
As a further improvement of the method, the method further comprises a tenth step of: and starting the winch 120 to reversely rotate, and drawing the two low gravity center transport vehicles 10 by the wire rope 130 to return to the starting place from the destination.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method special for transporting a box girder assembled by a heavy prefabricated arch bridge is characterized by comprising the following steps: providing two low-gravity center transport vehicles, wherein each low-gravity center transport vehicle comprises a vehicle frame made of steel plates and two U-shaped rollers, the two U-shaped rollers are respectively installed at two ends of the vehicle frame through shafts and bearings, and the distance between the top of a bearing beam of the vehicle frame and the top of the U-shaped roller is 10-100 mm, and the method comprises the following steps:
the first step is as follows: arranging two parallel channels under a prefabricated arch box base mold for supporting a prefabricated arch bridge assembly box girder;
the second step is that: two parallel steel rails are arranged in the two channels, and the two steel rails extend to a destination from the beginning in parallel;
the third step: respectively installing the two low gravity center transport vehicles on two steel rails and synchronizing the two low gravity center transport vehicles;
the fourth step: mounting a winch to a fixed base at a destination, and connecting free ends of a wire rope on the winch to the two low-center-of-gravity transport vehicles;
the fifth step: lifting the prefabricated arch bridge assembly box girder by using a jack;
and a sixth step: respectively moving two low-gravity center transport vehicles into the two channels, so that the two low-gravity center transport vehicles are positioned right below the prefabricated arch bridge assembly box girder;
the seventh step: the jack is retracted, so that the prefabricated arch bridge assembled box girder falls on two low gravity center transport vehicles;
eighth step: and starting the winch to rotate forwards, and dragging the two low-gravity center transport vehicles to synchronously move on the two steel rails by the steel wire rope until the prefabricated arch bridge assembled box girder is transported to a destination.
2. The method of claim 1, wherein: the frame comprises two longitudinal beams which are parallel to each other and a plurality of cross beams welded to the two longitudinal beams, the length of each longitudinal beam is 10-100 times of the height of the longitudinal beam, the height of each longitudinal beam is 5-20 times of the thickness of the longitudinal beam, and the U-shaped rollers are installed between the two longitudinal beams.
3. The method of claim 2, wherein: the two traction hooks are respectively positioned at the front end and the rear end of the frame.
4. The method of claim 3, wherein: the two towing hooks are made of round steel and then welded to the front end and the rear end of the frame respectively.
5. The method of claim 4, wherein: the outer ring of the bearing is nested in the inner ring of the U-shaped roller in an interference fit mode, the inner ring of the bearing is nested in the middle of the shaft in an interference fit mode, and two ends of the shaft are fixedly connected to the two longitudinal beams respectively.
6. The method of claim 4, wherein: each U-shaped roller is fixedly connected to the middle of the shaft, two ends of the shaft are respectively nested in an inner ring of one bearing in an interference fit mode, and outer rings of the two bearings are respectively and fixedly connected to the two longitudinal beams in an interference fit mode.
7. The method according to claim 5 or 6, characterized in that: key pin grooves are respectively arranged among the contact surfaces of the shaft, the bearing, the U-shaped idler wheel and the longitudinal beam, and key pins are arranged in the key pin grooves.
8. The method of claim 7, wherein: the two rails are made of P38 rail steel.
9. The method of claim 8, wherein: the ninth step is also included: and a step of unloading the prefabricated arch bridge assembly box girder from the two low-gravity center transport vehicles by using a cable crane at the destination.
10. The method of claim 9, wherein: further comprising the tenth step of: and starting the winch to reversely rotate, and dragging the two low-gravity center transport vehicles to return to the starting place from the destination by the steel wire rope.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113859274A (en) * | 2021-10-27 | 2021-12-31 | 中国化学工程第三建设有限公司 | Method for mounting large-scale equipment in place in indoor narrow space |
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| CN113859274B (en) * | 2021-10-27 | 2024-01-23 | 中国化学工程第三建设有限公司 | Method for realizing installation and positioning of large-scale equipment in indoor narrow space |
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Application publication date: 20201027 |