CN203346798U - Reverse dragging device for large span steel truss girder dragging construction - Google Patents

Reverse dragging device for large span steel truss girder dragging construction Download PDF

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Publication number
CN203346798U
CN203346798U CN 201320392547 CN201320392547U CN203346798U CN 203346798 U CN203346798 U CN 203346798U CN 201320392547 CN201320392547 CN 201320392547 CN 201320392547 U CN201320392547 U CN 201320392547U CN 203346798 U CN203346798 U CN 203346798U
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China
Prior art keywords
truss girder
steel truss
slideway
steel
dilatory
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CN 201320392547
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Chinese (zh)
Inventor
潘建勤
刘宏伟
王豪
吴洪群
王建功
廉则哲
杨巍
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CCCC SHB Fourth Engineering Co Ltd
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CCCC SHB Fourth Engineering Co Ltd
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Abstract

The utility model discloses a reverse dragging device for large span steel truss girder dragging construction. The reverse dragging device comprises a temporary support and a winch, a sliding way with the groove-shaped cross section is arranged on the temporary support, a crawler-type moving device capable of moving along the sliding way is arranged in the sliding way, a steel truss girder is arranged on the crawler-type moving device, a fixed pulley block is arranged on the upper portion of the front end of the temporary support, and a pulling rope wound on the winch is wound on the fixed pulley block and is connected with the front end of the steel truss girder through a movable pulley block. The reverse dragging device is simple in structure, reasonable in design, good in bearing performance, safe, reliable, high in construction efficiency, strong in practicability and worthy of popularization and application.

Description

Reverse towed equipment for the longspan steel truss girder hauling construction
Technical field
The utility model belongs to technical field of bridge engineering, relates in particular to a kind of reverse towed equipment for the longspan steel truss girder hauling construction.
Background technology
The dilatory method construction of steel truss girder is spelling on approach embankment or on scaffold by steel truss girder, and establishes sliding way on steel truss girder, on embankment or scaffold, sets slideway, by the roller bearing between upper and lower slideway, steel truss girder is drawn to predetermined bridge opening, and the beam that falls is in place.Dilatory method construction has disturbs little remarkable advantage to traffic under bridge, for crossing over the steel truss girder construction common method of existing railway, highway Business Line.
Whether slideway and traction system are the important force structures in hauling construction, and can slideway and traction system normally use and work, directly affect hauling construction and can carry out smoothly safely.The slideway system mainly is comprised of sliding way and lower slider, and the connection between up and down slideway and steel truss girder and supporting should be solid and reliable, and surfacing is smooth, evenly power transmission, and simple structure.Traction system generally is comprised of hoist engine, fixed pulley group, running block and wire rope etc.
General full cantilever hauling or the semi-cantilever of adopting of traditional dilatory mode drawn.Full cantilever longitudinal pull, be not establish any type of falsework in bridge opening, directly bridge is dragged on the pier of the place ahead, generally need establish nose girder.Semi-cantilever longitudinal pull: temporary rest pier is set in bridge opening and carries out the semi-cantilever longitudinal pull.In the full cantilever of tradition and the dilatory process of semi-cantilever, steel girder member bar internal force changes complexity, and the longitudinal stability of rod member is difficult for keeping.
Conventional slideway system glide path is generally by vertically continuous i iron or rail, laterally sleeper forms, sliding way generally is comprised of the i iron and the slide plate that are fixed on main truss lower chord below, slideway particularly sliding way and supporting construction to be connected difficulty large, during construction, connect unstable, usually affect construction speed, jeopardize the safety of construction.For reducing the frictional resistance of dilatory process, conventional slideway system generally adopts rolling bar and tetrafluoro plate as slide block.But the progression of serpentine locomotion easily appears in this method when dilatory, and dilatory speed is unstable, rectifies a deviation more frequent, has unsettled potential safety hazard; When dilatory with rolling bar, the recycling replacing operation inconvenience of rolling bar, correction adopts the mode of making oblique rolling bar, and effect is difficult to get instant result; The tetrafluoro plate easily is out of shape as slideway equipment, and laterally off normal is large, is difficult to correction, brings thus potential safety hazard large.
In addition, dilatory orientation generally adopts forward to draw form, and now dilatory process is larger on the impact of traffic under bridge, and easily causes potential safety hazard.
The utility model content
The defect that the utility model exists in order to solve prior art, a kind of reverse towed equipment for the longspan steel truss girder hauling construction is provided, it has solved steel truss girder component internal force in traditional hauling construction and has changed complexity, and the longitudinal stability of steel truss girder member is difficult for keeping; Slideway is yielding, poor stability, dilatory and the correction difficulty is large; To shortcomings such as traffic safety hidden danger under bridge are large.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: for the reverse towed equipment of longspan steel truss girder hauling construction, comprise falsework and hoist engine, falsework is provided with the slideway that cross section is groove shapes, be provided with the crawler type body transporting unit that can move along slideway in slideway, described steel truss girder is located on the crawler type body transporting unit, hoist engine is arranged on steel truss girder, the upper front end of falsework is provided with the fixed pulley group, and the pull rope be wound around on hoist engine is walked around the fixed pulley group and is connected with the steel truss girder front end by a running block.
Described falsework comprises steel pipe post, i iron distribution beam, Bailey beam, shaped steel sleeper and the dilatory rail beam set gradually from bottom to top, and slideway is located on dilatory rail beam, and the fixed pulley group is located on Bailey beam.
Described crawler type body transporting unit is provided with the pressure distribution beam, and the pressure distribution beam is provided with the adjusting backing plate, and steel truss girder is placed on to be regulated on backing plate.
The left and right sides of described crawler type body transporting unit is provided with the spacing guiding steel plate that rolls and be connected with the slideway inside wall.
Described Bailey beam is provided with the postive stop baffle that is positioned at fixed pulley group rear.
Lower mask body is set forth specific design content of the present utility model:
(1), the design of slideway
Setting up the falsework of bowl fastening type full framing or steel pipe Bailey beam (i iron) pillar, arrangement pitch 25cm[on the falsework platform] 10a or [] 20a shaped steel is as the shaped steel sleeper.Between shaped steel sleeper and Bailey beam, with the U-shaped row of tipping in, fix.Arrange dilatory rail beam on the shaped steel sleeper.Dilatory rail beam adopts HW200 * 200 shaped steel, and dilatory rail beam both sides adopt the weldering of 1cm steel plate full.Weld slideway on dilatory rail beam, [25 channel-section steels are as elongated continuous slideway in employing.
(2), the design of crawler type body transporting unit
Steel truss girder, by contour straight straight line setting, is regulated camber by the adjusting backing plate at the bottom of steel truss girder.Adopt the crawler type body transporting unit to be placed in slideway.Under each large node of steel truss girder, one group of crawler type body transporting unit is set, two every group, the center distance of two crawler type body transporting units is 90cm, and equity is distributed in the node both sides.Place two Two bors d's oeuveres HW200 * 200 shaped steel on every group of crawler type body transporting unit as the pressure distribution beam, be of a size of 100cm * 50 cm.
(3), crawler type body transporting unit satisfactory after correcting design
The slideway dilatory for steel truss girder adopts [25 channel-section steels, the spacing of the both sides of crawler type body transporting unit and channel-section steel inside wall is every side 2cm, controllability for pull-offs direction, the both sides that are body transporting unit at first sliding way of beam-ends arrange a spacing guiding steel plate that the 1cm arc is capable, when steel truss girder is dilatory, during the contacting of spacing guiding steel plate and slideway inside wall, the guide effect that spacing guiding steel plate can be genuine good, so that steel truss girder is normally dilatory.And it is bundled on steel truss girder with iron wire in crawler type body transporting unit rear and front end, reduce the possibility of its skew.
(4), dilatory actuating unit
Before construction, the hoist engine of tractive force and the same side that steel truss girder all is placed on spanning are provided, by wire rope and steel truss girder front end, fix, oppositely draw and realize that by hoist engine tractive wire rope steel truss girder is dragged to the dilatory mode of opposite abutment from abutment one side.The hazards of steel truss girder when oppositely dilatory mode has avoided the forward drag rope across highway construction, created condition for expressway safety is unimpeded.
(5), hoist engine model, assembly pulley number are determined
Dilatory traction power adopts two low speed winch, if the deadweight of definition steel truss girder is G, dilatory safety factor is thought of as 1.25, and the steel truss girder deadweight is Q=1.25G.When steel truss girder adopts cylinder dilatory, the design formulas of its horizontal drag force is as shown in the formula shown in 1.
Figure 2013203925471100002DEST_PATH_IMAGE001
(1)
In formula: T---horizontal drag force, (N);
The vertical summation of G---steel truss girder and pedestrian load, (N);
---ramp and horizon angle, (°);
Figure DEST_PATH_IMAGE003
---the friction factor of steel and steel;
N---the aisle gradient, upward slope is just being got, descending is got negative.
Installation of slide track is level, known according to " mechanical engineer's electronic documentation ", and steel and steel are 0.05 being coated with the coefficient of kinetic friction under oil condition.Known according to formula 1, shown in the horizontal drag force of steel truss girder is calculated as follows.
Figure 59678DEST_PATH_IMAGE004
In the large mileage side of design bridge pier, a fixed pulley group is installed, in little mileage side, a running block is installed, at steel truss girder initiating terminal one node installation hoist engine, hoist engine lays out the pulling force design formulas of rope as shown in the formula shown in 2.
(2)
In formula: S---horizontal drag force, t;
F---rotation friction, without the assembly pulley value 1.06 of bearing;
N---tackle pulley working rope number;
K---fairlead number, 1;
Q---member gravity, t;
According to formula 1, the horizontal drag force T of steel truss girder.Owing to adopting two hoist engines dilatory, so the power Q=T/2 of each hoist engine distribution.According to formula 2, the pulling force that hoist engine lays out rope calculates as follows.
Figure 114222DEST_PATH_IMAGE006
Calculate according to above formula the pulling force that hoist engine lays out rope, can determine the hoist engine model, determine moving fixed pulley group number.
(6) hoist engine and assembly pulley are fixed
Dilatory fulcrum (hoist engine) is fixed on the bridge deck at steel truss girder place, N door fixed pulley group by large mileage design pier top Bailey beam end is connected M door running block with the bearing hole of steel truss girder node and oppositely draws, the center line of running block and fixed pulley group is set to overlap with the middle line tracking of steel truss girder main truss, can reduce the probability of steel truss girder off normal when dilatory like this.
Every 20 tons of hoist engine penetrate n thigh 43 wire rope by N door fixed pulley group to the assembly pulley of M door running block the junction on the Bailey beam of the node of steel truss girder and design Dun Ding are fixed.
Hoist engine is welded and fixed with channel-section steel and bridge deck on four sides, and in order to prevent the disengagement of attachment weld, the insurance that secondary is carried out with two 5 tons of Chain blocks again in rear end is connected and fixed.Two hoist engines put center all with the lower chord of steel truss girder in line parallel, center to center distance is 3m, apart from the vertical distance of beam front end, is 60m.
The front end of steel truss girder connects M door running block, the junction plate (boring fasten connect) thick with 30mm by the bearing keyhole of steel truss girder, then, after penetrating with the keyhole of wire rope and junction plate, by buckle, be fixed.
The fixed pulley group is fixed on 5 latchings of the Bailey beam front end that designs Dun Ding, with wire rope and latching, with buckle, fixes.Steel truss girder 50cm place at the front end of fixed pulley group arranges postive stop baffle, between running block and fixed pulley group, does not collide guaranteeing.
Adopt technique scheme, the utlity model has following remarkable advantage:
1) shaped steel sleeper, dilatory rail beam play the effect of supporting skid rail, slideway is made by channel-section steel, the crawler type body transporting unit is located in slideway, pressure distribution beam and adjusting backing plate are located on the crawler type body transporting unit, connection is reliable, bearing capacity is high, it is little to be out of shape, with the obvious advantage during the steel truss girder large in span, that load is heavy is dilatory.
2) the crawler type body transporting unit is as dilatory motion carrier, and rolling frictional resistance therebetween is little and balanced, has overcome left and right slideway in routine techniques and because frictional resistance is unbalanced, has caused the left and right slideway starting nonsynchronous problem of moment.
3) in the utility model, the roller bearing of each crawler type body transporting unit all carries out circulating rolling at dolly in limited scope and advances, and by roller bearing, the reach of the rolling in limited range travels forward slideway, and its motion feature shows the characteristics of steady and smooth; Make that steel truss girder is dilatory advances steadily, smooth and easy, overcome the motion mode that original dilatory mode exists pause and transition in rhythm or melody, pulse, increased substantially dilatory safety.
4) the crawler type body transporting unit is placed in slideway and, at the spacing guiding steel plate of left and right arranged outside, makes the linearity of advancing to advance by linear fashion preferably, and the off normal in the minimizing process and correction have improved safety and the dilatory efficiency of traveling process.
5) each equipment assembling and disassembling of the present utility model is efficient and convenient, not yielding, easily controls, and reduces staffing, effectively shortens the dilatory time, improves efficiency of construction.
6) wearing and tearing of crawler type body transporting unit are little, reusable, reduce the cost.
7) hoist engine in the utility model adopts oppositely dilatory steel truss girder mode, and the hazards while having avoided the forward drag rope across highway construction, created condition for expressway safety is unimpeded.
The utility model is simple in structure, reasonable in design, load-carrying properties are good, safe and reliable, efficiency of construction is high, practical, be worthy of popularization.
The accompanying drawing explanation
Fig. 1 is that the utility model is removed the structural representation under the hoist engine state;
Fig. 2 is the lateral view of Fig. 1;
Fig. 3 is that in the utility model, hoist engine is oppositely drawn the structural representation of steel truss girder;
Fig. 4 is the top view of Fig. 3.
The specific embodiment
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, reverse towed equipment for the longspan steel truss girder hauling construction, comprise falsework and hoist engine 1, falsework is provided with the slideway 2 that cross section is groove shapes, be provided with the crawler type body transporting unit 3 that can move along slideway 2 in slideway 2, steel truss girder 4 is located on crawler type body transporting unit 3, hoist engine 1 is arranged on steel truss girder 4, the upper front end of falsework is provided with fixed pulley group 5, and the pull rope 7 be wound around on hoist engine 1 is walked around fixed pulley group 5 and is connected with steel truss girder 4 front ends by a running block 6.
Falsework comprises steel pipe post 8, i iron distribution beam 9, Bailey beam 10, shaped steel sleeper 11 and the dilatory rail beam 12 set gradually from bottom to top, and slideway 2 is located on dilatory rail beam 12, and fixed pulley group 5 is located on Bailey beam 10.
Crawler type body transporting unit 3 is provided with pressure distribution beam 13, and pressure distribution beam 13 is provided with regulates backing plate 14, and steel truss girder 4 is placed on to be regulated on backing plate 14.
The left and right sides of crawler type body transporting unit 3 is provided with the spacing guiding steel plate 15 that rolls and be connected with slideway 2 inside walls.
Bailey beam 10 is provided with the postive stop baffle 16 that is positioned at fixed pulley group 5 rears.
The utility model is elaborated below to enumerate a concrete embodiment:
(1) design of slideway 2
Set up bowl fastening type full framing or steel pipe Bailey beam 10(i iron) falsework of pillar, arrangement pitch 25cm[on the falsework platform] 10a or [] 20a shaped steel is as shaped steel sleeper 11.Between shaped steel sleeper 11 and Bailey beam 10, with the U-shaped row of tipping in, fix.Arrange dilatory rail beam 12 on shaped steel sleeper 11.Dilatory rail beam 12 adopts HW200 * 200 shaped steel, and dilatory rail beam 12 both sides adopt the weldering of 1cm steel plate full.Welding slideway 2 on dilatory rail beam 12, [25 channel-section steels are as elongated continuous slideway 2 in employing.
(2), the design of crawler type body transporting unit 3
Steel truss girder 4, by contour straight straight line setting, is regulated camber by the adjusting backing plate 14 at 4 ends of steel truss girder.Adopt crawler type body transporting unit 3 to be placed in slideway 2.Under steel truss girder 4 each large node, one group of crawler type body transporting unit 3 is set, two every group, the center distance of two crawler type body transporting units 3 is 90cm, and equity is distributed in the node both sides.Place two Two bors d's oeuveres HW200 * 200 shaped steel on every group of crawler type body transporting unit 3 as pressure distribution beam 13, be of a size of 100cm * 50 cm.
(3), crawler type body transporting unit 3 satisfactory after correcting designs
The slideway 2 dilatory for steel truss girder 4 adopts [25 channel-section steels, the spacing of the both sides of crawler type body transporting unit 3 and channel-section steel inside wall is every side 2cm, controllability for pull-offs direction, the both sides that are body transporting unit at first sliding way 2 of beam-ends arrange a spacing guiding steel plate 15 that the 1cm arc is capable, when steel truss girder 4 is dilatory, during the contacting of spacing guiding steel plate 15 and slideway 2 inside walls, spacing guiding steel plate 15 can play good guide effect, so that steel truss girder 4 is normally dilatory.And it is bundled on steel truss girder 4 with iron wire in crawler type body transporting unit 3 rear and front ends, reduce the possibility of its skew.
(4), dilatory actuating unit
Before construction, the hoist engine 1 of tractive force and the same side that steel truss girder 4 all is placed on spanning are provided, by wire rope and steel truss girder 4 front ends, fix, oppositely draw and realize that by hoist engine 1 tractive wire rope steel truss girder 4 is dragged to the dilatory mode of opposite abutment from abutment one side.Hazards when steel truss girder 4 oppositely dilatory mode has avoided the forward drag rope across highway construction, created condition for expressway safety is unimpeded.
(5), hoist engine 1 model, assembly pulley number are determined
Dilatory traction power adopts two low speed winch 1, if 4 deadweights of definition steel truss girder are G, dilatory safety factor is thought of as 1.25, and steel truss girder 4 deadweights are Q=1.25G.When steel truss girder 4 adopts cylinder dilatory, the design formulas of its horizontal drag force is as shown in the formula shown in 1.
Figure DEST_PATH_IMAGE007
(1)
In formula: T---horizontal drag force, (N);
The vertical summation of G---steel truss girder 4 and pedestrian load, (N);
Figure 544066DEST_PATH_IMAGE002
---ramp and horizon angle, (°);
Figure 441484DEST_PATH_IMAGE003
---the friction factor of steel and steel;
N---the aisle gradient, upward slope is just being got, descending is got negative.
Slideway 2 is set to level, known according to " mechanical engineer's electronic documentation ", and steel and steel are 0.05 being coated with the coefficient of kinetic friction under oil condition.Known according to formula 1, shown in the horizontal drag force of steel truss girder 4 is calculated as follows.
Figure 716607DEST_PATH_IMAGE004
In the large mileage side of design bridge pier, a fixed pulley group 5 is installed, in little mileage side, a running block 6 is installed, at steel truss girder 4 initiating terminal one node installation hoist engines 1, hoist engine 1 lays out the pulling force design formulas of rope as shown in the formula shown in 2.
Figure 360078DEST_PATH_IMAGE005
(2)
In formula: S---horizontal drag force, t;
F---rotation friction, without the assembly pulley value 1.06 of bearing;
N---tackle pulley working rope number;
K---fairlead number, 1;
Q---member gravity, t;
According to formula 1, the horizontal drag force T of steel truss girder 4, owing to adopting, two hoist engines 1 are dilatory, so the power Q=T/2 of each hoist engine 1 distribution.According to formula 2, the pulling force that hoist engine 1 lays out rope calculates as follows.
Figure 226403DEST_PATH_IMAGE006
Calculate according to above formula the pulling force that hoist engine 1 lays out rope, can determine hoist engine 1 model, determine the number of running block 6, fixed pulley group 5.
(6) hoist engine 1 and assembly pulley are fixed
Dilatory fulcrum (hoist engine 1) is fixed on the bridge deck at steel truss girder 4 places, and the N door fixed pulley group 5 by large mileage design pier top Bailey beam 10 ends is connected M door running block 6 with the bearing hole of steel truss girder 4 nodes and oppositely draws.And the center line of running block 6 and fixed pulley group 5 is set to overlap with the middle line tracking of steel truss girder 4 main trusses, will reduce the probability of steel truss girder 4 off normals when dilatory like this.
Every 20 tons of hoist engine 1 assembly pulley by 5 pairs of M door running blocks 6 of N door fixed pulley group penetrates n thigh 43 wire rope the junction on the Bailey beam 10 of the node of steel truss girder 4 and design Dun Ding is fixed.
Hoist engine 1 four sides is welded and fixed with channel-section steel and bridge deck, and in order to prevent the disengagement of attachment weld, the insurance that secondary is carried out with two 5 tons of Chain blocks again in rear end is connected and fixed.Two hoist engines 1 put center all with the lower chord of steel truss girder 4 in line parallel, center to center distance is 3m, apart from the vertical distance of beam front end, is 60m.
The front end of steel truss girder 4 connects M door running block 6, the junction plate (boring fasten connect) thick with 30mm by the bearing keyhole of steel truss girder 4, then, after penetrating with the keyhole of wire rope and junction plate, by buckle, be fixed.
Fixed pulley group 5 is fixed on 5 latchings of Bailey beam 10 front ends that design Dun Ding, with wire rope and latching, with buckle, fixes.50cm place at the steel truss girder 4 of the front end of fixed pulley group 5 arranges postive stop baffle 16, between running block 6 and fixed pulley group 5, does not collide guaranteeing.

Claims (5)

1. for the reverse towed equipment of longspan steel truss girder hauling construction, it is characterized in that: comprise falsework and hoist engine, falsework is provided with the slideway that cross section is groove shapes, be provided with the crawler type body transporting unit that can move along slideway in slideway, described steel truss girder is located on the crawler type body transporting unit, hoist engine is arranged on steel truss girder, and the upper front end of falsework is provided with the fixed pulley group, and the pull rope be wound around on hoist engine is walked around the fixed pulley group and is connected with the steel truss girder front end by a running block.
2. the reverse towed equipment for the longspan steel truss girder hauling construction according to claim 1, it is characterized in that: described falsework comprises steel pipe post, i iron distribution beam, Bailey beam, shaped steel sleeper and the dilatory rail beam set gradually from bottom to top, slideway is located on dilatory rail beam, and the fixed pulley group is located on Bailey beam.
3. the reverse towed equipment for the longspan steel truss girder hauling construction according to claim 2, it is characterized in that: described crawler type body transporting unit is provided with the pressure distribution beam, and the pressure distribution beam is provided with the adjusting backing plate, and steel truss girder is placed on to be regulated on backing plate.
4. the reverse towed equipment for the longspan steel truss girder hauling construction according to claim 3 is characterized in that: the left and right sides of described crawler type body transporting unit is provided with the spacing guiding steel plate that rolls and be connected with the slideway inside wall.
5. the reverse towed equipment for the longspan steel truss girder hauling construction according to claim 4, it is characterized in that: described Bailey beam is provided with the postive stop baffle that is positioned at fixed pulley group rear.
CN 201320392547 2013-07-03 2013-07-03 Reverse dragging device for large span steel truss girder dragging construction Expired - Fee Related CN203346798U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103410093A (en) * 2013-07-03 2013-11-27 中交二公局第四工程有限公司 Reverse dragging device for construction of dragging large-span steel braced girder
CN103924529A (en) * 2014-04-28 2014-07-16 中铁十局集团建筑工程有限公司 Rolling drag device and construction method thereof
CN104060543A (en) * 2014-07-01 2014-09-24 中铁八局集团昆明铁路建设有限公司 Installation device of prefabricated bridge deck
CN107858932A (en) * 2017-11-28 2018-03-30 江西乔田重工有限公司 Towed equipment and construction method of a kind of large-scale girder steel based on fining twisted steel and continuous hydraulic top
CN111663451A (en) * 2020-06-18 2020-09-15 中铁四局集团有限公司 Construction method of ultrahigh tower of long-span bearing type continuous steel truss girder bridge in high mountain canyon

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103410093A (en) * 2013-07-03 2013-11-27 中交二公局第四工程有限公司 Reverse dragging device for construction of dragging large-span steel braced girder
CN103924529A (en) * 2014-04-28 2014-07-16 中铁十局集团建筑工程有限公司 Rolling drag device and construction method thereof
CN103924529B (en) * 2014-04-28 2015-12-02 中铁十局集团建筑工程有限公司 A kind of rolling towed equipment and construction method thereof
CN104060543A (en) * 2014-07-01 2014-09-24 中铁八局集团昆明铁路建设有限公司 Installation device of prefabricated bridge deck
CN104060543B (en) * 2014-07-01 2016-04-13 中铁八局集团昆明铁路建设有限公司 A kind of erecting device of prefabricated bridge
CN107858932A (en) * 2017-11-28 2018-03-30 江西乔田重工有限公司 Towed equipment and construction method of a kind of large-scale girder steel based on fining twisted steel and continuous hydraulic top
CN107858932B (en) * 2017-11-28 2023-09-29 江西乔田重工有限公司 Dragging device and construction method for large steel beam based on finish rolling deformed steel bar and continuous hydraulic roof
CN111663451A (en) * 2020-06-18 2020-09-15 中铁四局集团有限公司 Construction method of ultrahigh tower of long-span bearing type continuous steel truss girder bridge in high mountain canyon

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