CN107245957B - Method and equipment for erecting stiffening beam of suspension bridge in air without track - Google Patents
Method and equipment for erecting stiffening beam of suspension bridge in air without track Download PDFInfo
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- CN107245957B CN107245957B CN201710702155.3A CN201710702155A CN107245957B CN 107245957 B CN107245957 B CN 107245957B CN 201710702155 A CN201710702155 A CN 201710702155A CN 107245957 B CN107245957 B CN 107245957B
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- cable
- stiffening
- girder
- stiffening beam
- hoisting
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
Abstract
The invention discloses a method and equipment for erecting a stiffening beam of a suspension bridge in a trackless way in the air, wherein the method comprises the following steps: 1. temporarily suspending a plurality of horizontally arranged outriggers on a main cable through slings, arranging movable beam conveying pulleys at two ends of the outriggers, and arranging a cable crane and a stiffening beam hoisting system on the main cable; 2. after the stiffening girder at the temporary hoisting point is hoisted to the height of the girder transporting trolley by the stiffening girder hoisting system, the stiffening girder is placed on the driven-in girder transporting trolley; 3. the cable carrying crane is used for carrying the stiffening beam to the assembling position of the stiffening beam, the cable carrying crane is used for carrying and hoisting the stiffening beam, the cable carrying crane is moved away, the stiffening beam and the erected stiffening beam are assembled, and the cable carrying crane runs to the assembling position of the next stiffening beam; 4. and repeating the second step and the third step, and assembling the stiffening beams one by one. The invention has the characteristics of good economy and large bearing capacity, the transportation capacity can exceed 400 tons, and the running is smoother.
Description
Technical Field
The invention belongs to a construction method and equipment of a suspension bridge, and particularly relates to a method and equipment for erecting a stiffening beam of the suspension bridge in an overhead trackless manner.
Background
At present, a common method for erecting a whole section of steel truss stiffening girder at a shoal part of a suspension bridge across a river is known to be a trestle bridge method, a method for erecting a whole section of steel truss stiffening girder in the whole range of the suspension bridge across a canyon is known to be a rail cable sliding method, and the problem that a cable crane needs to overcome when being loaded and moved is also great. The trestle method needs 2 rows of supporting piles and 2 rows of beams which can bear the sliding of the stiffening beams, steel and equipment are very large, and the installation of the supporting piles is difficult to process if meeting the condition of high strength of riverbed bedrock. The rail cable sliding method can effectively solve the installation problem of the 2 bridge stiffening beams, but the rail cable and the anchoring thereof are expensive, and when the stiffening beam section is heavy, the beam transporting vehicle has large up-and-down fluctuation.
Disclosure of Invention
The invention aims to provide a method and equipment for erecting a stiffening beam of a suspension bridge in an overhead trackless manner, which have good economy and large bearing capacity.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the invention provides a method for erecting a stiffening beam of a suspension bridge in an aerial trackless manner, which comprises the following steps of:
1. temporarily suspending a plurality of horizontally arranged outriggers on a main cable along the direction of a suspension bridge through slings, taking two ends of the outriggers as supports to arrange a beam transporting pulley hooked on the outriggers to move, arranging a cable crane capable of moving along the main cable on the main cable, and temporarily anchoring a stiffening beam hoisting system on the main cable above a temporary hoisting point;
2. after the stiffening beam at the temporary hoisting point is hoisted to the height of the beam transporting pulley by the stiffening beam hoisting system, the stiffening beam is placed on the driven beam transporting pulley;
3. the cable carrying crane is used for carrying the stiffening beam to the assembling position of the stiffening beam, the cable carrying crane is used for carrying and hoisting the stiffening beam, the cable carrying crane is moved away, the stiffening beam and the erected stiffening beam are assembled, and the cable carrying crane runs to the assembling position of the next stiffening beam;
4. and repeating the second step and the third step, and assembling the stiffening beams one by one.
And in the third step, after the cable crane carries and lifts the stiffening beam, the stiffening beam is lifted to a position about 10cm below the installation position, the beam conveying pulley is removed, the cantilever beam of the section is detached from the sling and falls on the stiffening beam, the stiffening beam is lifted again, the stiffening beam is connected with the sling after the cantilever beam is detached, and then the stiffening beam is assembled with the erected stiffening beam.
The invention provides equipment for erecting stiffening beams of a suspension bridge in an overhead trackless manner, which comprises a group of outriggers, a girder transporting tackle, a stiffening beam hoisting system and a cable crane, wherein the outriggers are hung on a main cable through slings and extend out of the sling surface of the suspension bridge and are horizontally arranged along the direction of the suspension bridge, the girder transporting tackle is hung at two ends of a plurality of outriggers through longitudinal beams and is dragged on the outriggers by a reciprocating traction system to move, the stiffening beam transporting tackle is hung on the main cable, and the cable crane moves along the main cable to lift and transport the stiffening beams to an assembling position.
The cantilever beam is fixed by a set of steel wire rope fixing system, two end parts of the cantilever beam are provided with flat roll devices, and the girder transporting pulley is supported on the flat roll devices at the end parts of 2-3 cantilever beams through a longitudinal beam.
The steel wire rope fixing system comprises a guide cable and a positioning cable which are respectively connected with the upper edge and the lower edge of the end part of the cantilever beam, the end part of the guide cable is fixed on the main cable through an anchoring cable clamp, a guide cable turning position node plate is arranged on the guide cable, and a guide cable balancing weight is suspended on the guide cable turning position node plate; the end part of the positioning cable is fixed on the main cable through an anchoring cable clamp, a positioning cable steering part node plate is arranged on the positioning cable, and a positioning cable balancing weight is suspended on the positioning cable steering part node plate.
The stiffening beam hoisting system comprises a pulley block hung on the main cable through a temporary cable clamp and a steel wire rope, the pulley block hoists the stiffening beam through a shoulder pole beam and a hoisting steel wire rope, and a traction steel wire rope of the traction pulley block is connected with a winch at the top of the bridge tower.
And the bottom of the longitudinal beam of the girder transporting pulley is provided with a vertical roller pair matched with the guide cable, so that the girder transporting pulley moves on the cantilever under the guide of the guide cable.
Advantageous effects
1. The girder transporting pulley moves on the cantilever beam through the longitudinal beam to transport the stiffening girder segment, the longitudinal beam of the girder transporting pulley is equivalent to a section of movable track beam, 2-3 pairs of flat roll devices at two ends of the cantilever beam are always arranged below the longitudinal beam, the track is not required to be laid and the girder is not required to be erected in the whole process by adopting the mode, and the girder transporting pulley does not need to climb in the running process, does not need strong power and saves energy.
2. The cantilever beam uses the permanent sling as a support, does not need other support components with huge cost such as a support pile of a trestle, and the sling is a tensile component, so that the problem of instability of a pressure lever does not exist, and the sling takes root on a main cable, thereby saving cost, and being stable and reliable.
3. The two ends of the cantilever beam extend out of the sling surface, the flat roller device is placed on the cantilever beam and close to the sling, so that the mechanical characteristics of the cantilever beam are that the shearing force is large, the bending moment is small, only short beams with strong shearing resistance need to be manufactured at the joint (namely two ends) of the cantilever beam and the sling, the short beams at two ends are connected by a common recyclable shaping product, namely a Bailey frame, at the middle part of the cantilever beam, the Bailey frame is small in using amount, and a large amount of Bailey frames are needed when the trestle is used for paving a girder of a track.
The stiffening beam is erected by adopting the method and the equipment, so that the stiffening beam has the characteristics of good economy and large bearing capacity, the transportation capacity can exceed 400 tons, the running is smooth, and the suspension bridge crossing canyons and rivers can be implemented.
The technical scheme of the invention is further explained by combining the attached drawings.
Drawings
Fig. 1 is a schematic view of the present invention for lifting a stiffening beam at a temporary lifting point.
FIG. 2 is a schematic view of the present invention with stiffeners on the incoming carrier skid.
Fig. 3 is a schematic view of the girder block of the present invention transporting a stiffening girder to a splicing position.
Fig. 4 is a partially enlarged view of a portion a in fig. 3.
Fig. 5 is a schematic view of the cable crane of the present invention lifting the stiffening beam and removing the beam trolley.
Fig. 6 is a partially enlarged view of fig. 5 at B.
Fig. 7 is a schematic view of the outrigger, the fixing system, and the traction system installed near the bridge tower of the present invention.
Figure 8 is a schematic view of a guide wire in the reciprocating traction system and the wire rope securing system of the present invention.
FIG. 9 is a schematic view of a positioning cable in the wire rope securing system of the present invention.
FIG. 10 is a schematic view of the present invention with the outriggers left installed after the beam trolley is installed.
Figure 11 is a schematic view of the construction of the girder block according to the present invention.
Fig. 12 is a partial enlarged view of fig. 11 at C.
Figure 13 is a schematic view of the invention showing the guiding of the transfer trolley.
In the figure, 1, an outrigger, 101, an end part, 102, an outrigger connecting beam, 2, a flat roller device, 3, an anchoring cable clamp, 4, a guide cable, 5, a positioning cable, 6, a guide cable steering node plate, 7, a positioning cable steering node plate, 8, a guide cable balancing weight, 9, a positioning cable balancing weight, 10, a beam carrier, 1001, a C-shaped hook truss, 1002, a longitudinal beam, 1003, a longitudinal beam main truss sheet, 1004, a connecting beam, 11, a traction rope, 12, a fixed pulley, 13, a cable crane, 1301, a pulling system, 1302, a temporary cable clamp II, 14, a stiffening beam hoisting system, 1401, a temporary cable clamp I, 1402, 1403, a traction cable, 1404, a pulley block, 1405, a flat spreader beam, 1406, a steel wire, 15, a main cable, 16, 17, a stiffening beam, 18, a bridge tower, 19, a transportation Liang Chuanbo.
Detailed Description
As shown in figure 1, the equipment for erecting the stiffening beam of the suspension bridge in the air without rails comprises slings 16 fixed on two main cables 15 and respectively forming the suspension bridge sling surface, a group of cantilever beams 1 which are temporarily hung on the slings 16 and the two ends of which extend out of the suspension bridge sling surface and are horizontally and parallelly arranged along the suspension bridge direction, a girder transporting trolley 10 which is hung on the two end parts 101 of a plurality of cantilever beams 1 along the suspension bridge direction and is in a groove structure and pulled by a reciprocating traction system to move back and forth on the cantilever beams 1, a stiffening beam hoisting system 14 hung on the main cables 15, and a cable crane 13 which moves along the main cables 15 to hoist and transport the stiffening beams to the assembly position.
As shown in fig. 1 and 4, the outrigger 1 is formed by splicing two end parts 101 of a truss structure and an outrigger connecting beam 102 connecting the two end parts 101, the end part 101 of the outrigger 1 is welded by section steel and has a short length, and the middle outrigger connecting beam 102 is spliced by bailey frames and occupies most of the components of the outrigger 1; the flat roll devices 2 are arranged at the two end parts 101 of the cantilever beam 1, the installation positions of the flat roll devices 2 are close to slings 16 (supporting points), the bending moment of the gravity of the stiffening beam 17 and the beam transporting trolley 10 on the cantilever beam 1 is reduced to the maximum extent, so that the cantilever beam 1 does not need strong bending resistance, meanwhile, the end part 101 of the cantilever beam 1 is welded by strong section steel and can effectively bear load, the end part 101 of the cantilever beam only occupies a small part of the cantilever beam 1, the structure is very important for reducing the material consumption of a plurality of cantilever beams 1, the bailey truss belongs to a shaping product with strong bending resistance and relatively weak shearing resistance, is very suitable for being repeatedly used in large quantities, and avoids more one-time investment; the cantilever beam 1 is fixedly hung on an anchoring cable clamp 3 arranged on a main cable 15 through a set of steel wire rope fixing system, the steel wire rope fixing system comprises two groups of guide cables 4 and positioning cables 5 which are respectively anchored on the anchoring cable clamps 3 arranged on two main cables 15, as shown in figures 1, 6, 8 and 9, each group of guide cables 4 and positioning cables 5 is respectively connected with the upper edge and the lower edge of one end part 101 of all the cantilever beams 1, a guide cable steering node plate 6 and a positioning cable steering node plate 7 are respectively arranged on the guide cables 4 and the positioning cables 5 obliquely below the anchoring cable clamps 3, container type guide cable counterweight blocks 8 and positioning cable counterweight blocks 9 are respectively hung on the guide cable steering node plate 6 and the positioning cable steering node plates 7, and the guide cables 4 and the positioning cables 5 can be injected into the counterweight blocks to generate horizontal tension which is 3 times of the weight of the counterweight blocks so as to fix all rows of the cantilever beams 1, and the steel wire rope fixing system is used for preventing the cantilever beams 1 from overturning, shaking and resisting the impact of a transport beam trolley 10;
as shown in fig. 1, 11 and 12, the girder trolley 10 is a groove structure, the upward opening is wider than the stiffening girder 17, and the stiffening girder 17 in the girder trolley 10 can be lifted upward without obstacles; the girder transporting trolley 10 comprises C-shaped hook trusses 1001 on two sides and a connecting beam 1004 for connecting the bottoms of the C-shaped hook trusses 1001, the longitudinal beam 1002 is connected with the upper part of each C-shaped hook truss 1001 into a whole, a main girder sheet 1003 is arranged on the inner side of each longitudinal beam 1002, the girder transporting trolley 10 is hung on the flat roller device 2 at the end part 101 of the cantilever beam 1 through the main girder sheet 1003, the longitudinal beam 1002 of the girder transporting trolley 10 spans 2 stiffening beams and 17 beam sections, and the girder transporting trolley 10 is supported by 2-3 pairs of flat roller devices 2 all the time when sliding on the flat roller device 2 through the longitudinal beam 1002, so that tracks do not need to be laid and girders do not need to be erected in the whole process; the girder transport trolley longitudinal girder main girder piece 1003 belongs to a rigid track and is not similar to a flexible track cable, climbing is not needed in the running process of the girder transport trolley 10, fluctuation is small, strong traction power is not needed, energy is saved, and the advantages of the rigid track and the flexible track are combined; the connecting beams 1004 at the lower ends of the C-shaped hook trusses 1001 on the two sides of the connecting beam trolley are spliced by the Bailey frames, and because the C-shaped hook trusses 1001 have strong shearing resistance, the gravity of the stiffening beam 17 is mainly applied to the bottoms of the C-shaped hook trusses 1001 of the connecting beam trolley, and the Bailey frames cannot bear large load; the lower edges of the front end and the rear end of the longitudinal beam 1002 are made into an upward-warped arc, because the sling 16 is long, a small amount of extension can be generated under the action of load, the beam transporting trolley 10 can sink, and the arc sections of the front end and the rear end of the longitudinal beam 1002 of the beam transporting trolley enable the beam transporting trolley 10 to smoothly transit to the flat roller device 2.
As shown in fig. 1, 6 and 8, the reciprocating traction system for drawing the back and forth movement of the girder block 10 includes a traction rope 11 and a fixed pulley 12 connected to a traction device, the fixed pulley 12 is installed on the guide rope steering gusset 6, the traction rope 11 is rotated around the fixed pulley 12 to form a closed loop, and the traction device drives the traction rope 11 to reciprocate the girder block 10 between a temporary hoisting point position of the stiffening girder 17 and a splicing position of the stiffening girder 17. Since the traction force applied to the traction rope 11 by the traction bar trolley 10 is smaller than the tension force of the guide rope 4, the fixed pulley 12 for steering is arranged in such a way that the existing construction equipment is effectively utilized.
As shown in fig. 1, 6, 10 and 13, the guide cable 4 also serves to guide the girder block 10. 3 pairs of vertical rollers 19 are arranged at the bottom of the longitudinal beam 1002 of the beam carrier, the guide cable 4 passes through the middle of each pair of rollers 19 (see fig. 13), the tensioned guide cable 4 forms certain rigidity, the beam carrier 10 is guided by the guide cable 4 when running, particularly in the area near the flat roller device 2, the guide cable 4 is more rigid, and the beam carrier 10 can be well guided to pass through the flat roller device 2.
As shown in fig. 1 and 7, the stiffening beam hoisting system 14 includes a wire rope 1402 fixed on the main cable 15 by a temporary rope clamp I1401, an upper pulley block 1404 connected with the wire rope 1402, a lower pulley block 1404 connected with the upper pulley block 1404 by a traction wire rope 1403, a carrying pole beam 1405 connected with the lower pulley block 1404', and a hoisting wire rope 1406 arranged on the carrying pole beam 1405, wherein the traction wire rope 1403 is connected with a winch at the top of the bridge tower 18; the cable loader 13 is secured to the main cable 15 by means of a temporary rope clamp II1302 and a pulling system 1301. The cable crane 13 is a shaped product which functions to lift the stiffening girder section 1 carried by the girder block 10 to facilitate the installation of the section.
The installation process of the equipment of the invention is shown in fig. 1, 7-10, most of the outriggers 1 can be transported to the installation position by using a beam transporting trolley 10 for installation, 3 groups of outriggers 1 at the bridge tower 18 are firstly installed, and then a fixing system of the outriggers 1 is installed: the method comprises the steps of anchoring a cable clamp 3, a guide cable steering node plate 6, a positioning cable steering node plate 7, a guide cable 4, a positioning cable 5, a guide cable balancing weight 8 and a positioning cable balancing weight 9, wherein the balancing weight is a water tank surrounded by steel plates, only 1/2 of water is filled at the time, a beam transport pulley 10 is installed beside a bridge tower 18, a traction rope 11 of the beam transport pulley 10 is installed, a 4 th group of cantilever beams 1 are hung at the front end of the beam transport pulley 10, the beam transport pulley 10 is driven to run towards the midspan, the 4 th row of sling cables 16 are driven, the 4 th group of cantilever beams 1 are installed on a 4 th row of sling cables 16, the process is repeated, all the cantilever beams 1 are installed, the positions of all the cantilever beams 1 are adjusted, the remaining 1/2 of water is filled into the guide cable balancing weight 8 and the positioning cable balancing weight 9, the tensioning of the guide cable 4 and the positioning cable 5 is completed, and all the cantilever beams 1 are fastened with the guide cable 4 and the positioning cable 5.
The method comprises the following steps:
1. as shown in fig. 1, in a place where a ship a can drive in a shoal export beam, a temporary hoisting point is provided, and a stiffening beam 17 is hoisted from the ship a, which is always set to a position of a closure section, and for a suspension bridge across a canyon, the stiffening beam 17 is generally transported from a bridgehead to a midspan; a plurality of horizontal parallel arranged outriggers 1 are temporarily suspended on a main cable 15 along the assembling direction of the stiffening beams through slings 16, a beam transporting pulley 10 is hung on the outriggers 1 through longitudinal beams 1002 by taking two end parts 101 of the plurality of outriggers 1 as supporting hooks, a cable carrying crane 13 capable of moving along the main cable 15 is arranged on the main cable 15, and a stiffening beam hoisting system 14 is temporarily anchored on the main cable 15 above a temporary hoisting point;
2. as shown in fig. 1 and 2, the stiffening beams 17 at the temporary hoisting point are hoisted by the stiffening beam hoisting system 14; during hoisting, a hoisting steel wire rope 1406 on the shoulder pole beam 1405 fixes the stiffening beam 17, the winch drives the traction steel wire rope 1403 to hoist the lower pulley block 1404' and the shoulder pole beam 1405, after the stiffening beam 17 is hoisted to the height of the beam transporting trolley 10 from the ship a, the beam transporting trolley 10 drives into the position of the stiffening beam 17 under the traction of the reciprocating traction system traction rope 11, and the stiffening beam 17 is lowered and falls into the beam transporting trolley 10;
3. as shown in fig. 3 and 5, the mobile beam transporting trolley 10 transports the stiffening beam 17 from the temporary hoisting point position to the assembling position, the cable carrying crane 13 carries the suspended stiffening beam 17 to a position about 10cm below the installation position, the beam transporting trolley 10 is moved away, the outrigger 1 of the section is detached from the sling 16 and falls on the stiffening beam 17, the stiffening beam 17 is lifted again, the stiffening beam 17 is connected with the sling 16 after the outrigger 1 is detached, the stiffening beam 17 is assembled with the erected stiffening beam, and the cable carrying crane 13 is moved to the assembling position of the next beam section by the pulling system 1301 for waiting;
4. and repeating the second step and the third step to assemble the stiffening beams 17 one by one.
The method has the advantages of good economy and strong adaptability, the transportation of Liang Guocheng is safe, stable and quick, the length of the sling near the bridge tower is large, the extension amount is maximum, but the maximum extension amount does not exceed 10cm, namely the fluctuation of the beam transportation trolley does not exceed 10cm in the beam transportation process, the method is relatively stable, and the beam transportation speed is favorably improved. The invention is suitable for the situation that the stiffening beam can not be transported to the lower part of the bridge for vertical hoisting and installation, such as the shoal position of the suspension bridge across rivers and the canyon-crossing suspension bridge.
Claims (6)
1. A method for erecting a stiffening beam of a suspension bridge in an overhead trackless manner is characterized by comprising the following steps:
1. temporarily suspending a plurality of horizontally arranged outriggers on a main cable along the direction of a suspension bridge through slings, taking two ends of the outriggers as supports to arrange a beam transporting pulley hooked on the outriggers to move, arranging a cable crane capable of moving along the main cable on the main cable, and temporarily anchoring a stiffening beam hoisting system on the main cable above a temporary hoisting point;
2. after the stiffening girder at the temporary hoisting point is hoisted to the height of the girder transporting trolley by the stiffening girder hoisting system, the stiffening girder is placed on the driven-in girder transporting trolley;
3. the cable carrying crane is used for carrying the stiffening beam to the assembling position of the stiffening beam, the cable carrying crane is used for carrying and hoisting the stiffening beam, the cable carrying crane is moved away, the stiffening beam and the erected stiffening beam are assembled, and the cable carrying crane runs to the assembling position of the next stiffening beam; after the cable carrying crane receives and hoists the stiffening beam, hoisting the stiffening beam to a position 10cm below the installation position, removing the beam transporting pulley, detaching the outrigger of the section from the sling and dropping the outrigger on the stiffening beam, lifting the stiffening beam again, connecting the stiffening beam with the sling after detaching the outrigger, and splicing the stiffening beam with the erected stiffening beam;
4. and repeating the second step and the third step, and assembling the stiffening beams one by one.
2. The equipment for overhead trackless erection of stiffening beams of suspension bridge is characterized by that it includes a group of cantilever beams which are hung on the main cable by means of sling and extended out of the sling surface of suspension bridge and are horizontally arranged along the direction of suspension bridge, a beam-conveying block which is hung on two end portions of several cantilever beams by means of longitudinal beam and is drawn by reciprocating traction system and moved on the cantilever beams and formed into a recessed groove structure, a stiffening beam hoisting system hung on the main cable and a cable-carrying crane which is moved along the main cable, lifted and transferred the stiffening beam to the splicing position.
3. The equipment for erecting the stiffening girder of the suspension bridge without rails in the air according to claim 2, wherein the outrigger is fixed by a set of steel wire rope fixing system, flat roll devices are arranged at two end parts of the outrigger, and the girder transporting trolley is supported on the flat roll devices at the end parts of 2-3 outriggers through a longitudinal beam thereof.
4. The overhead trackless erection suspension bridge stiffening beam device of claim 3, wherein the wire rope fixing system comprises a guide cable and a positioning cable respectively connected with the upper edge and the lower edge of the end of the cantilever beam, the end of the guide cable is fixed on the main cable through an anchoring cable clamp, the guide cable is provided with a guide cable turning node plate, and a guide cable counterweight is suspended on the guide cable turning node plate; the end part of the positioning cable is fixed on the main cable through an anchoring cable clamp, a positioning cable steering part node plate is arranged on the positioning cable, and a positioning cable balancing weight is suspended on the positioning cable steering part node plate.
5. The apparatus of claim 4, wherein the stiffening girder hoisting system comprises a pulley block suspended on the main cable by the temporary cable clamp I and the wire rope, the pulley block hoists the stiffening girder by the carrying pole beam and the hoisting wire rope, and the hoisting wire rope of the traction pulley block is connected to the hoist at the top of the bridge tower.
6. The apparatus for stiffening the overhead trackless erection suspension bridge as claimed in claim 4 or 5, wherein the bottom of the longitudinal beam of the girder transporting trolley is provided with a pair of vertical rollers which are matched with the guide cables, so that the girder transporting trolley moves on the stiffening girder under the guidance of the guide cables.
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| CN201710702155.3A CN107245957B (en) | 2017-08-16 | 2017-08-16 | Method and equipment for erecting stiffening beam of suspension bridge in air without track |
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| CN201710702155.3A CN107245957B (en) | 2017-08-16 | 2017-08-16 | Method and equipment for erecting stiffening beam of suspension bridge in air without track |
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| CN107245957B true CN107245957B (en) | 2022-11-15 |
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| CN108842634A (en) * | 2018-08-06 | 2018-11-20 | 王燏斌 | A kind of Bridge Erector for cable-stayed bridge and suspension bridge |
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