CN111535194A - Special hoisting system of 900 ton fortune frame all-in-one - Google Patents
Special hoisting system of 900 ton fortune frame all-in-one Download PDFInfo
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- CN111535194A CN111535194A CN202010406982.XA CN202010406982A CN111535194A CN 111535194 A CN111535194 A CN 111535194A CN 202010406982 A CN202010406982 A CN 202010406982A CN 111535194 A CN111535194 A CN 111535194A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
A special hoisting system of a 900-ton frame transporting integrated machine comprises a plurality of gantry cranes, wherein the gantry cranes are arranged on two sides of a track bridge under construction in a spanning mode; the positioning and supporting unit is fixedly arranged on the top surface of the beam box which is built at the upper stage and provides positioning and supporting for the rear supporting leg of the bridge girder erection machine. The hoisting system can solve the problem that the all-in-one machine is restricted by the constraint of environmental conditions in the hoisting process, enables the 900-ton transporting and erecting all-in-one machine to normally feed beams and accurately hoist and position, is convenient for the construction of transporting and erecting beams on a bridge, effectively solves the construction problems of feeding beams and transporting and erecting beams under complex working conditions, has simple structure and concise operation, obviously reduces the beam loading period, and has wide economic benefit.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a special hoisting system of a 900-ton transporting and erecting integrated machine.
Background
When a 900-ton integrated transporting and erecting machine is adopted for transporting and erecting a beam in a high-speed railway passenger transport line, a climbing ramp is usually arranged at a beam lifting station, then the integrated transporting and erecting machine is used for transporting and erecting the beam on a bridge after being mounted in a beam storage area, but with the rapid development of the high-speed passenger transport line, the geographical environment changes such as hills, mountainous areas, rivers and the like are large, the geological conditions are complex and variable, the construction cost of a beam transportation sidewalk is high, or the climbing ramp cannot be built at all, so that the integrated transporting and erecting machine is difficult to transport to a specified construction site, the construction difficulty is high, and when the beam is transported and erected, the inter-bridge transfer of a bridge erecting machine and a beam box is needed when line casting beam construction, roadbed section construction and next beam box hoisting are completed in one-time, the bridge erecting machine cannot pass through a roadbed and line casting beam section due to the influence of the auxiliary structure of the supporting leg system behind the bridge erecting machine, or, a large amount of folding and hoisting positioning are required to be carried out by means of external hoisting equipment, and assembly is required after construction is completed, so that the construction difficulty is high, the risk is high, and the safety is uncontrollable.
Through published patent search, the following patent schemes are found to be similar to the scheme:
a general lifting appliance (CN110790121A) based on lifting of bridge sections discloses a general lifting appliance based on lifting of bridge sections, which comprises a large carrying pole balance beam, a hinged support, balance weights, a cross lifting belt, a small carrying pole balance beam and a double-hole short lifting lug plate; the lifting appliance is connected to a lifting pulley block of the bridge girder erection machine through a pin roll; the first pin shaft is arranged at the center of gravity of the big shoulder pole balance beam; the hinged support is arranged at two ends of the big shoulder pole balance beam; the small shoulder pole balance beam is arranged on the hinged support through a second pin shaft, and the cross sling is crosswise welded by two thick steel plates and is respectively connected with the small shoulder pole balance beam and the short double-hole lifting lug plate through a third connecting pin shaft and a fourth connecting pin shaft; the short double-hole connecting lug plate is connected with the lifting lug on the bridge section. The scheme is characterized in that the lifting point of a lifting pulley block is fixed, the length of the force arm of the central line of the lifting points at two ends is changed by adjusting the hinge seat at the balanced mounting position of the large carrying pole, the lifting point of the pulley block is always positioned on the gravity center of a beam section, and the lifted beam section is always in a horizontal state, namely the lifting point is lifted according to the design of a bridge.
A bridge girder erection machine girder hoisting frame (CN208055880U) is characterized in that the upper surface and the lower surface of a supporting upright post are connected with a base and an upper crossbeam through flanges, the side surface of the supporting upright post is welded with a transverse inclined strut and a longitudinal inclined strut ear seat plate, the transverse strut longitudinal strut is arranged on the ear seat plate through a pin shaft, a carrying pole beam is arranged at the lower part of the girder, a steel strand or finish-rolled deformed steel bar sequentially penetrates through the carrying pole beam, the upper crossbeam, a split heads and a hollow jack, anchor locking plates (nuts) are fixed on the steel strand (finish-rolled deformed steel bar), anchor locking plates (nuts) are respectively arranged between the upper crossbeam and the split heads, above the hollow jack and at the lower part of the carrying pole beam, the girder is hoisted step by step through the reciprocating jacking of the hollow jack and the stress conversion of the anchors (nuts) at the upper end of the jack and the upper end of the crossbeam, the hoisting frame, small occupied area. The lifting efficiency is high, the stability is good, and the factor of safety is high advantage has in the use. The device is adopted in the construction of multiple railways and highways to safely and efficiently complete the installation task of the bridge girder erection machine.
Through the analysis, there is great difference with this application in the aspect of the slip hoist and mount structure, hoist bearing effect, support lifting structure and the automatic counterpoint structure of above-mentioned patent of disclosing, consequently does not influence the novelty of this application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a special hoisting system for a 900-ton transporting and erecting integrated machine, which can solve the problem that the integrated machine is restricted by environmental conditions in the hoisting process, enables the 900-ton transporting and erecting integrated machine to normally feed beams and accurately hoist and position, is convenient for bridge-loading and girder-transporting construction, effectively solves the construction problems of the beam feeding and the girder-transporting under complex working conditions, has simple structure and concise operation, obviously reduces the girder loading period, and has wide economic benefits.
A special hoisting system of a 900-ton frame transporting integrated machine comprises a plurality of gantry cranes, wherein the gantry cranes are arranged on two sides of a track bridge under construction in a spanning mode; the positioning and supporting unit is fixedly arranged on the top surface of the beam box which is built at the upper stage and provides positioning and supporting for the rear supporting leg of the bridge girder erection machine.
The hoisting adjusting unit comprises a sliding beam, an adjusting hanging strip and a fixed beam, wherein the sliding beam is fixedly hung on a crane of the gantry crane, and the bottom of the sliding beam is hinged and connected along the horizontal longitudinal direction and is connected with the adjusting hanging strip along the horizontal transverse direction; the bottom of the adjusting sling is hinged and connected to the top surface of the fixed beam along the horizontal longitudinal direction.
The sliding beam comprises a T-shaped cross beam and a concave transverse sliding block, wherein the T-shaped cross beam is fixedly hung at the bottom of the gantry crane, two sides of the middle part of the T-shaped cross beam are fixedly provided with a bidirectional transverse moving oil cylinder along the horizontal direction, and the concave transverse sliding block is sleeved on the lower part of the T-shaped cross beam in a sliding manner; the T-shaped cross beam is symmetrically provided with vertically through hoisting holes, and four corners of the bottom of the T-shaped cross beam are provided with wing plates extending along the horizontal longitudinal direction.
Moreover, hanging plates which are hung on the wing plates in a sliding way are respectively manufactured at four corners of the top of the concave transverse sliding block, a plurality of lug plates which are hinged with the output end of the bidirectional transverse oil cylinder are fixedly arranged on the inner walls of two sides of the concave transverse sliding block, and the bottom of the concave transverse sliding block and the top of the fixed beam are symmetrical and are fixedly provided with a plurality of pin shafts along the horizontal transverse direction; the pin shafts are all connected with adjusting hanging belts.
Moreover, the middle part of the adjusting sling is disconnected, and adjusting bases are fixedly connected to the disconnected parts; the two adjusting bases are arranged oppositely, and an adjusting screw rod is connected between the two adjusting bases in a threaded manner; external threads in opposite directions are respectively formed at two ends of the adjusting screw rod, and a horizontally through adjusting hole is formed in the middle of the adjusting screw rod.
The positioning and supporting unit comprises a steel pad pier, an oil cylinder and an oil pump assembly, wherein a bolt at the bottom of the steel pad pier is fixedly connected to the top surface of the beam box, and a first hinge seat is fixedly arranged on the side wall of the steel pad pier; the top surface of the beam box is fixedly connected with a second hinged seat, and the second hinged seat is hinged with an oil pump assembly; the side wall of the oil pump assembly is fixedly connected with an oil cylinder, and the output end of the oil cylinder is hinged and connected with the first hinge base.
And, the oil pump assembly includes oil pump and valve block, wherein rigid coupling oil pump and hydro-cylinder on the valve block, and two subtend lateral walls of valve block all with the articulated seat hinge dress of second be connected.
And the top surface of the steel pad pier is compositely bonded with a rubber limiting ring, and the rubber limiting ring is circumferentially coated at the rear retreat bottom of the bridge girder erection machine.
The invention has the advantages and technical effects that:
according to the special hoisting system of the 900-ton frame transporting integrated machine, the portal crane in the prior art provides initial hoisting power, the bottom of the portal crane provides hoisting hanging support through the T-shaped cross beam, the horizontal transverse sliding hoisting function is realized through the wing plate at the bottom of the T-shaped cross beam and the hanging plate at the top of the concave transverse sliding block, and the bidirectional transverse moving oil cylinder provides sliding power and sliding limit limiting for the concave transverse sliding block in the sliding process; the adjusting hanging strips are hinged and connected through pin shafts at the bottoms of the concave transverse sliding blocks and the tops of the fixed beams, so that the horizontal longitudinal and horizontal buffering and adjusting hoisting functions are realized; and finally, adjusting the lifting height of the integral adjusting straps by adjusting the adjusting lead screw and the adjusting base in the straps, so that the integrated transporting and erecting machine is prevented from inclining during lifting, the acceptance uniformity of the adjusting straps is ensured, the lifting position of the bridge erecting machine is convenient to finely adjust, the adjusting hole in the middle of the adjusting lead screw is used for manually inserting a pin rod, and the distance between the two adjusting bases is convenient to manually adjust.
According to the special hoisting system for the 900-ton integrated transporting and erecting machine, the second hinged seat fixedly arranged on the top surface of the beam box provides positioning hinged support for the oil pump assembly, the oil pump assembly rotates to support the oil cylinder, the oil cylinder pushes the steel pad pier to the retreating bottom of the bridge erecting machine with small height for automatic alignment, finally the steel pad pier and the beam box are fixed through bolts, the rubber limiting ring on the top surface of the steel pad pier provides radial limiting for the retreating of the bridge erecting machine, when the automatic alignment is carried out, the two ends of the oil cylinder are hinged supports, and the problem that the steel pad pier is blocked and cannot be pushed due to depression on the top surface of the beam box is effectively solved.
The special hoisting system for the 900-ton transportation and erection integrated machine is free from the influence of an auxiliary structure of a bridge deck system when the 900-ton bridge erection machine transfers between bridges, does not need to disassemble and assemble a large amount of equipment, can carry out rapid inter-bridge transfer operation, is simple to operate, economical, practical, safe and reliable, meets the specific working condition requirement that the 900-ton transportation and erection integrated machine has no climbing channel, well avoids the adverse influence problem of geographical and geological environments on hoisting construction, realizes the transportation and erection beam construction of the transportation and erection integrated machine under the complex working condition, has the advantages of simplicity in operation, low cost, high efficiency, accuracy in installation, economy, safety, practicability and reliability, and is a special hoisting system for the 900-ton transportation and erection integrated machine with higher creativity.
Drawings
FIG. 1 is a schematic diagram of the integral hoisting of a 900 ton transportation and erection integrated machine of the present invention;
FIG. 2 is a front view of the hoist adjust unit of the present invention;
FIG. 3 is a side view of the hoist adjust unit of the present invention;
FIG. 4 is a top view of the hoist adjust unit of the present invention;
FIG. 5 is a partial enlarged view of the connection of the adjusting base and the adjusting screw in the lifting adjusting unit according to the present invention;
FIG. 6 is a front view of the positioning support unit of the present invention;
FIG. 7 is a side view of the positioning support unit of the present invention;
in the figure: 1-a bridge girder erection machine; 2-rear support legs; 3-positioning the supporting unit; 4, gantry crane; 5-hoisting and adjusting the unit; 6-T-shaped cross beams; 7-bidirectional transverse moving oil cylinder; 8-concave horizontal sliding block; 9-hoisting holes; 10-a pin shaft; 11-adjusting the sling; 12-adjusting the base; 13-a fixed beam; 14-wing plate; 15-hanging the board; 16-ear plate; 17-adjusting the screw rod; 18-an adjustment hole; 19-steel pad pier; 20-a first articulated seat; 21-oil cylinder; 22-an oil pump; 23-a valve block; 24-a second articulated seat; 25-bolt; 26-beam box; 27-rubber limit ring.
Detailed Description
For a further understanding of the contents, features and effects of the present invention, reference will now be made to the following examples, which are to be considered in conjunction with the accompanying drawings. It should be noted that the present embodiment is illustrative, not restrictive, and the scope of the invention should not be limited thereby.
A special hoisting system of a 900-ton frame transporting integrated machine comprises a plurality of gantry cranes 4, wherein the gantry cranes are arranged on two sides of a track bridge under construction in a spanning mode, the hoisting system also comprises a hoisting adjusting unit 5 and a positioning supporting unit, the top of the hoisting adjusting unit is connected with a crane of the gantry cranes, and the bottom of the hoisting unit is hoisted and connected with a bridge girder erection machine 1; the positioning and supporting unit is fixed on the top surface of the beam box 26 which is built at the upper stage and provides positioning and supporting for the rear supporting leg 2 of the bridge erecting machine.
The laying direction of the beam box is defined as horizontal longitudinal direction, the direction which is horizontally vertical to the laying direction of the beam box is horizontal transverse direction, and the hoisting adjusting unit comprises a sliding beam, an adjusting hanging strip 11 and a fixed beam 13, wherein the sliding beam is fixedly hung on a crane of a gantry crane, and the bottom of the sliding beam is hinged along the horizontal longitudinal direction and is connected with the adjusting hanging strip in a sliding manner along the horizontal transverse direction; the bottom of the adjusting sling is hinged and connected to the top surface of the fixed beam along the horizontal longitudinal direction.
The sliding beam comprises a T-shaped cross beam 6 and a concave transverse sliding block 8, wherein the T-shaped cross beam is fixedly hung at the bottom of the gantry crane, two sides of the middle part of the T-shaped cross beam are fixedly provided with a bidirectional transverse moving oil cylinder 7 along the horizontal direction, and the concave transverse sliding block is sleeved on the lower part of the T-shaped cross beam in a sliding manner; the T-shaped cross beam is symmetrically provided with vertically through hoisting holes 9, and four corners of the bottom of the T-shaped cross beam are provided with wing plates 14 extending along the horizontal longitudinal direction.
Moreover, hanging plates 15 which are hung on wing plates in a sliding way are respectively manufactured at four corners of the top of the concave transverse sliding block, a plurality of ear plates 16 which are hinged with the output end of the bidirectional transverse oil cylinder are fixedly arranged on the inner walls of two sides of the concave transverse sliding block, and a plurality of pin shafts 10 are respectively and symmetrically arranged at the bottom of the concave transverse sliding block and the top of the fixed beam along the horizontal transverse direction; the pin shafts are all connected with adjusting hanging belts.
Moreover, the middle part of the adjusting sling is disconnected, and the disconnected parts are all fixedly connected with an adjusting base 12; the two adjusting bases are arranged oppositely, and an adjusting screw rod 17 is connected between the two adjusting bases in a threaded manner; external threads in opposite directions are respectively formed at two ends of the adjusting screw rod, and an adjusting hole 18 which is horizontally communicated is formed in the middle of the adjusting screw rod.
Moreover, the positioning and supporting unit comprises a steel pad pier 19, an oil cylinder 21 and an oil pump 22 assembly, wherein a bolt 25 at the bottom of the steel pad pier is fixedly connected to the top surface of the beam box, and a first hinge seat 20 is fixedly arranged on the side wall of the steel pad pier; the top surface of the beam box is fixedly connected with a second hinged seat 24 which is hinged and connected with an oil pump assembly; the side wall of the oil pump assembly is fixedly connected with an oil cylinder, and the output end of the oil cylinder is hinged and connected with the first hinge base.
And, the oil pump assembly includes oil pump and valve block 23, wherein rigid coupling oil pump and hydro-cylinder on the valve block, and two subtend lateral walls of valve block all with the articulated dress of second seat be connected.
And, compound bonding has rubber spacing ring 27 on the top surface of steel pad mound, and this rubber spacing ring circumference cladding is in the frame bridge crane back portion of moving back.
In addition, the invention is preferable that the pin shaft can be fixedly welded on the ground of the concave transverse sliding block and the top surface of the fixed beam, and the pin shaft is wound with the hanging and adjusting sling; the pin roll can also be rotatably provided with a roller, and the roller is wound with a hanging and adjusting sling.
In order to more clearly describe the specific embodiments of the present invention, an example is provided below:
according to the special hoisting system for the 900-ton lifting and erecting integrated machine, the concave transverse moving sliding block and the transverse moving oil cylinder are mounted on the T-shaped cross beam of the lifting appliance, the lug plates are welded in the concave transverse moving sliding block, transverse moving power is provided for the concave transverse moving sliding block by the transverse moving oil cylinder, the lifting belts are hung and wound on the pin shafts, the two adjusting bases are respectively connected with the upper part and the lower part of the lifting belts, and the two adjusting bases are connected with each other in an adjustable mode through the adjusting lead.
This hoist and mount system's hoist and mount regulating unit passes through the hole for hoist and is connected with 450T portal crane hoist, concave type sideslip slider hangs upside down in T type crossbeam bottom, two-way sideslip hydro-cylinder through the two-way effect is flexible, the horizontal slip of concave type sideslip slider on T type crossbeam is controlled, realize feeding the accurate counterpoint of roof beam, through the adjustment lead screw during the construction, guarantee that the hoist and mount position of adjustment suspender is in on same horizontal plane, and then guarantee to be the same with the pulling force that the adjustment suspender receives more, and avoid the hoist and mount slope, improve hoist and mount stability and security.
According to the special hoisting system for the 900-ton bridge girder transporting and erecting integrated machine, when the 900-ton bridge girder erection machine is used for carrying out inter-bridge transfer by using the high-position transfer support, a certain height interval is required to be kept between the rear support legs of the bridge girder erection machine and a paved beam box after the rear support legs of the bridge girder erection machine move in place, the interval is small, and if steel pad piers are installed in the interval manually, labor is wasted, and the beam box is high in position and high in danger of manual operation, so that the supporting device with the automatic alignment function is designed, when the steel pad piers are automatically aligned, pushing force is applied to the side walls of the steel pad piers by the oil cylinder, the steel pad piers slide on the top surface of the beam box, one end of the oil cylinder is hinged and connected with the side walls of the steel pad piers through the first hinge seat, the other end of the oil cylinder is hinged and connected with the second hinge seat through the valve block, and the problem that the; the steel pad pier needs to be installed by the connecting bolt of steel pad pier and roof beam case by the manual work after putting in place, and then crane below bridging machine makes bridging machine rear leg fall into to carry out radial spacing in the rubber spacing ring to bridging machine rear leg bottom is supported by the top surface of steel pad pier.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a special hoist and mount system of 900 ton fortune frame all-in-one, includes a plurality of portal cranes, and the portal crane all strides and establishes in the both sides of track bridge under construction, its characterized in that: the hoisting system also comprises a hoisting adjusting unit and a positioning and supporting unit, wherein the top of the hoisting adjusting unit is connected with a crane of a gantry crane, and the bottom of the hoisting unit is hoisted and connected with a bridge girder erection machine; the positioning and supporting unit is fixedly arranged on the top surface of the beam box which is built at the upper stage and provides positioning and supporting for the rear supporting leg of the bridge girder erection machine.
2. The special hoisting system of a 900 ton fortune frame all-in-one of claim 1, the direction of laying of defining the roof beam case is horizontal vertical, and the direction of horizontal perpendicular to roof beam case is horizontal, its characterized in that: the hoisting adjusting unit comprises a sliding beam, an adjusting hanging strip and a fixed beam, wherein the sliding beam is fixedly hung on a crane of the gantry crane, and the bottom of the sliding beam is hinged along the horizontal longitudinal direction and is connected with the adjusting hanging strip along the horizontal transverse direction; the bottom of the adjusting sling is hinged and connected to the top surface of the fixed beam along the horizontal longitudinal direction.
3. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 2, wherein: the sliding beam comprises a T-shaped cross beam and a concave transverse sliding block, wherein the T-shaped cross beam is fixedly hung at the bottom of the wheel rail lifting pulley, two sides of the middle part of the T-shaped cross beam are fixedly provided with bidirectional transverse moving oil cylinders along the horizontal direction, and the concave transverse sliding block is slidably sleeved at the lower part of the T-shaped cross beam; and the T-shaped cross beam is symmetrically provided with vertically through hoisting holes, and wing plates extending along the horizontal longitudinal direction are arranged at four corners of the bottom of the T-shaped cross beam.
4. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 3, wherein: hanging plates which are connected with the wing plates in a sliding and hanging mode are manufactured at four corners of the top of the concave transverse sliding block, a plurality of lug plates which are hinged with the output end of the bidirectional transverse oil cylinder are fixedly installed on the inner walls of two sides of the concave transverse sliding block, and the bottom of the concave transverse sliding block and the top of the fixed beam are symmetrical and are fixedly provided with a plurality of pin shafts along the horizontal transverse direction; the pin shafts are all connected with adjusting hanging strips in a hanging mode.
5. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 2, wherein: the middle part of the adjusting sling is disconnected, and adjusting bases are fixedly connected to the disconnected parts; the two adjusting bases are arranged in opposite directions, and an adjusting screw rod is connected between the two adjusting bases in a threaded manner; external threads in opposite directions are respectively formed at two ends of the adjusting screw rod, and a horizontally through adjusting hole is formed in the middle of the adjusting screw rod.
6. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 1, wherein: the positioning and supporting unit comprises a steel pad pier, an oil cylinder and an oil pump assembly, wherein a bolt at the bottom of the steel pad pier is fixedly connected to the top surface of the high-position cross beam, and a first hinge seat is fixedly arranged on the side wall of the steel pad pier; the top surface of the high-level beam is fixedly connected with a second hinged seat, and the second hinged seat is hinged with an oil pump assembly; and the side wall of the oil pump assembly is fixedly connected with an oil cylinder, and the output end of the oil cylinder is hinged and connected with the first hinge base.
7. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 6, wherein: the oil pump assembly comprises an oil pump and a valve block, wherein the valve block is fixedly connected with the oil pump and the oil cylinder, and two opposite side walls of the valve block are hinged and connected with the second hinged base.
8. The special hoisting system of the 900-ton integrated transporting and erecting machine according to claim 6, wherein: the top surface of the steel pad pier is compositely bonded with a rubber limiting ring, and the rubber limiting ring is circumferentially coated at the rear retreat bottom of the bridge girder erection machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406982.XA CN111535194A (en) | 2020-05-14 | 2020-05-14 | Special hoisting system of 900 ton fortune frame all-in-one |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406982.XA CN111535194A (en) | 2020-05-14 | 2020-05-14 | Special hoisting system of 900 ton fortune frame all-in-one |
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| CN202010406982.XA Pending CN111535194A (en) | 2020-05-14 | 2020-05-14 | Special hoisting system of 900 ton fortune frame all-in-one |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114481835B (en) * | 2021-12-13 | 2023-04-07 | 中铁第五勘察设计院集团有限公司 | Stepless span changing device and method for suspension point of bridge girder erection machine |
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Application publication date: 20200814 |