CN101845848B - Large-span steel connecting bridge and integral hoisting method thereof - Google Patents

Large-span steel connecting bridge and integral hoisting method thereof Download PDF

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Publication number
CN101845848B
CN101845848B CN2010102058259A CN201010205825A CN101845848B CN 101845848 B CN101845848 B CN 101845848B CN 2010102058259 A CN2010102058259 A CN 2010102058259A CN 201010205825 A CN201010205825 A CN 201010205825A CN 101845848 B CN101845848 B CN 101845848B
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steel
crossover
bridge
crane
building
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CN101845848A (en
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翟雷
张桂敏
荣军成
安凤杰
杨凯明
胡大川
张辉
贺国强
韩阳
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China Construction Second Engineering Bureau Co Ltd
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China Construction Second Engineering Bureau Co Ltd
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Abstract

The invention relates to a large-span steel connecting bridge and an integral hoisting method thereof. One end of a steel connecting bridge is connected with an original building through a high-strength bolt, and the other end is connected with a new building through a lead core rubber support saddle; an integral hoisting method is adopted for the hoisting of the steel connecting bridge, before a caterpillar crane enters a main hoisting position, a truck crane is used for raising the steel connecting bridge so as to move the steel connecting bridge to the installation position, and until the steel center stays in the main hoisting range of the caterpillar crane, the steel connecting bridge is integrally hoisted to the place through the caterpillar crane. Through a shock-isolation support saddle and a damper, the large-span steel connecting bridge can be arranged between the original building and the new building when the installation position is not previously reserved, the difficulties such as the restriction of the construction field, the restriction of the underground structural complexity and the restriction of the narrow integral hoisting space structure and the like can be overcome during the hoisting process, the normal use of the original building is ensured, and the construction period is shortened. The method can be widely applicable to the construction of the connecting bridge which is established on the present building.

Description

A kind of large-span steel connecting bridge and integral hoisting method thereof
Technical field
The present invention relates to a kind of large-span steel connecting bridge and integral hoisting technology thereof, particularly a kind of steel crossover of between existing building and new building, setting up.
Background technology
The setting up of steel crossover generally all constructed simultaneously with main building or at the beginning of the main building design planning just arranged, and exist in the actual engineering after main building finishes, in use or the later stage requirement of engineering be connected with original building, at this moment, do not reserve the associated components that is connected with the steel crossover on the original building, then steel crossover and the difficult point place that being connected of existing building has just become to set up the steel crossover, connect the improper force mode that is subjected to that can change existing building, cause structural safety hidden danger, take of the influence of steel crossover after method of attachment provided by the present invention can effectively reduce, and play effective vibration isolation effect existing building.Simultaneously general steel crossover deadweight is all bigger, and its installation can be adopted methods such as whole lifting, the diffusing assembly in high-altitude, segmentation lifting.The normal use of loosing and piece together long construction period, influence original building in the high-altitude; Segmental hoisting need be provided with two of higher bracing frames, and the crane erect-position must be satisfied in on-the-spot place.For large span, the narrower steel crossover in the big construction plant of deadweight, the present invention adopts at the ground integral assembling, then adopts the lr1400/2 crawler crane, and directly lifting can be shortened the engineering time, and does not influence the normal use of original building.
Summary of the invention
The purpose of this invention is to provide a kind of large-span steel connecting bridge and integral hoisting technology thereof, take the technical problem that is connected of steel crossover and original building after solving; And solution realizes the problem of large-span steel connecting bridge fast hoisting at narrow space.
For achieving the above object, the present invention adopts following technical scheme:
A kind of large-span steel connecting bridge, for by upper chord, middle chord member, lower chord, the steel truss that steel column and connecting rod are formed, described connecting rod comprises horizontal brace rod and oblique connecting rod, it is characterized in that: steel crossover one end is connected by high-strength bolt with new building, the other end is connected with original building, two reinforced columns are installed in the original building both sides, between bottom surface two reinforced columns of steel crossover design and installation position, new girder steel is arranged, new girder steel is connected with the lower chord of steel crossover, lower chord is a H shaped steel, the bottom flange of H shaped steel is connected with lead core rubber support by high-strength bolt, lead core rubber support is welded on the new girder steel, the adjacent two layers of floor position of original building respectively has a steel to support on new girder steel, the central socket damper that steel supports, steel supports an end and is connected by the horizontal pin node with reinforced column, and the other end is connected by the horizontal pin node with middle chord member or upper chord.
Described damper is a lead damper, it is made up of lead for retractable pencil, outer sleeve and end plate, end plate and steel support welding, the length of outer sleeve is greater than the length of lead for retractable pencil, the external diameter that the internal diameter of outer sleeve supports greater than steel, outer sleeve are enclosed within steel and support the outside, and wherein an end and steel support welding, the other end supports with steel and is not connected, and scribbles lubrication oil in the slit between steel support and the outer sleeve.
A kind of integral hoisting method step of large-span steel connecting bridge is as follows:
Step 1 according to lifting weight and hoisting depth, is selected the model of crawler crane and mobile crane.
Step 2, erect-position position and lifting requirements according to crawler crane and mobile crane, to the walking road surface of crawler crane and mobile crane and the stand place mat thick sand of 50mm at least, to the erect-position position of crawler crane and mobile crane and the walking road surface checking of bearing capacity of crawler crane and mobile crane, guarantee can not damage simultaneously to original building.
Step 3 according to the angle of weight, suspension centre quantity and the boom of steel crossover, is selected wire rope and otic placode, and is checked its safety.
Step 4 is set up cat ladder in the inner binding of the good steel crossover of splicing welding.
Step 5 according to calculating the hoisting point position of determining, at steel crossover design hoisting point position place's welding otic placode, is connected by snap ring wire rope with otic placode.
Step 6 is that the steel crossover is installed control line with steel crossover horizontal projection, and whole unwrapping wire is made the installation control line on ground; And in original building, ground, new building, observation point is set.
Step 7, the steel crossover is had bad luck: crawler crane enter main hang the position before, lift with mobile crane earlier, the steel crossover is moved to the installation site, and after the distance of 12 meters of the centres of gyration of the center to center distance crawler crane of steel crossover, the steel crossover lands, crawler crane enters the main position of hanging, and prepares lifting.
Step 8, the examination of steel crossover is hung; Crawler crane hoists suspension hook to steel crossover lowest part apart from ground 50 millimeters, stops lifting; Check the stress deformation of otic placode, lifting arm, check the ground cracking and the situation of sinking under the crawler crane crawler belt; Guaranteeing does not have falling object on the lifting arm; Firmly knock wire rope with pipe, guarantee that each wire rope is stressed even substantially.
Step 9 formally lifts the steel crossover; Inspection finishes, and suspension hook to the steel crossover lowest part that continues to hoist surpasses the basis, installation site, then by the rope of sauntering with the rotation of steel crossover, make the oblique commentaries on classics of steel crossover enter space between original building and new building.
Step 10 winches to the revolution of steel crossover directly over the basis, installation site then, slowly falls suspension hook to the basis, and the centering orientation is looked for verticality; With steel crossover installation in position.
Step 11, by extracing suspension hook and wire rope at the inner cat ladder of steel crossover in advance, and the site clearing instrument.
Otic placode described in the step 3 is oblique otic placode and straight otic placode.
Described crawler crane is the lr1400/2 crawler crane, and mobile crane is the 130t mobile crane.
Compared with prior art the present invention has following characteristics and beneficial effect:
At first,, realized between the original building of not reserving the installation site and new building, setting up large-span steel connecting bridge, taken of the influence of steel crossover after can effectively reducing, and played effective vibration isolation effect existing building by the setting of shock isolating pedestal;
Secondly, the integral hoisting method of the steel crossover that the present invention mentions, lift by crawler crane and mobile crane, realized the steel crossover integral hoisting of large span, difficulties such as construction plant restriction, underground structure complex limitation, integral hoisting space structures narrow limits in place have been overcome, can shorten the engineering time, and not influence the normal use of original building.
The present invention has overcome conventional steel crossover and the force mode that is subjected to that may change existing building being connected of main building, causes the shortcoming of structural safety hidden danger and the installation of steel crossover and adopts the diffusing normal use of piecing together long construction period, influencing original building in high-altitude; Adopt segmental hoisting that two of higher bracing frames need be set, and shortcomings such as crane erect-position must be satisfied in on-the-spot place, solved and reduced the influence of setting up behind the steel crossover existing building, and play effective vibration isolation effect, by the integral hoisting technology, difficulties such as construction plant restriction, underground structure complex limitation, integral hoisting space structures narrow limits in place have been overcome simultaneously.
The present invention can be widely used in setting up the construction of steel crossover between existing building and new building.
Description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is a steel crossover layout schematic diagram of the present invention.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Fig. 3 is the B-B sectional drawing of Fig. 1.
Fig. 4 is the connection diagram of steel crossover and existing building.
Fig. 5 is the C-C sectional drawing of Fig. 4.
Fig. 6 is the lead damper connection diagram.
Fig. 7 is lead damper lead for retractable pencil and steel support and connection detail drawing.
Fig. 8 is lead damper outer sleeve and steel support and connection detail drawing.
Reference numeral: chord member, 3-lower chord, 4-steel column, 5-horizontal brace rod, 6-high-strength bolt, 7-lead core rubber support, the new girder steel of 8-, 9-reinforced column, the support of 10-steel, 11-damper, 11.1-lead for retractable pencil, 11.2-outer sleeve, 11.3-end plate, the oblique connecting rod of 12-among 1-upper chord, the 2-.
The specific embodiment
Embodiment is referring to Fig. 1~shown in Figure 8, certain office building first phase and the second stage of stage construction, and the second phase is a newly-built structure.To between eight, nine and ten layers of original steel work and newly-built steel work, set up steel crossover (totally two, each one of thing, symmetric arrangement).Crossover axis size: span 36.1m, wide 2.7m, high 8.01m, be divided into two-layer, end absolute altitude 32.87m, the high 40.880m of steel crossover top mark, heavily about 122 tons of bed rearrangement steel crossover.Described large-span steel connecting bridge, for by upper chord 1, middle chord member 2, lower chord 3, the steel truss that steel column 4 and connecting rod are formed, described connecting rod comprises level connection 5 and oblique connecting rod 12, steel crossover one end is connected by high-strength bolt with new building, the other end is connected with original building, two reinforced columns 9 are installed in the original building both sides, between bottom surface two reinforced columns of steel crossover design and installation position, new girder steel 8 is arranged, new girder steel 8 is connected with the lower chord 3 of steel crossover, lower chord 3 is a H shaped steel, the bottom flange of H shaped steel is connected with lead core rubber support 7 by high-strength bolt 6, lead core rubber support 7 is welded on the new girder steel 8, the adjacent two layers of floor position of original building respectively has a steel to support 10 on new girder steel 8, steel supports 10 central socket damper 11, steel supports 10 1 ends and is connected by the horizontal pin node with reinforced column 9, and the other end is connected by the horizontal pin node with middle chord member 2 or upper chord 1.
Described damper 11 is a lead damper, it is made up of lead for retractable pencil 11.1, outer sleeve 11.2 and end plate 11.3, end plate 11.3 supports 10 welding with steel, the length of outer sleeve 11.2 is greater than the length of lead for retractable pencil 11.1, the internal diameter of outer sleeve 11.2 supports 10 external diameter greater than steel, and overcoat jacket casing 11.2 supports on 10 at steel, and wherein an end and steel support 10 welding, the other end supports 10 with steel and is not connected, and scribbles lubrication oil in the slit between steel support 10 and the outer sleeve 11.2.
The integral hoisting method of described large-span steel connecting bridge, its step is as follows:
Step 1 according to lifting weight and hoisting depth, is selected the model of crawler crane and mobile crane.
The about 122t of steel crossover lifting own wt, floor support plate 3.1t, chord member peg 0.15t, the Curtainwall connector 3.7t that need weld, the impost except that the crossover own wt is 3.1+0.15+3.7=6.95(t altogether)
The following table member is installed in crossover lifting back:
Steel crossover lifting gross weight=122+6.95-2.15=126.8(t)
Consider hoist cable suspender etc., crossover lifting gross weight is calculated with 130t, crossover installation site 40.88m, and the ground relative elevation is less than-2m.By-the 2m consideration, hoisting depth is 43m.The main crawler crane machinery that hangs is selected the lr1400/2 crawler crane, and mobile jib selects 63m long, during radius of gyration 10m, and biggest lifting capacity 175t, maximum lifting height 59m; During radius of gyration 12m, biggest lifting capacity 139t, maximum lifting height 57m; Therefore, the lr1400/2 crawler crane satisfies the lifting needs of steel crossover.
Step 2, erect-position position and lifting requirements according to crawler crane and mobile crane, to the walking road surface of crawler crane and mobile crane and the stand place mat thick sand of 50mm at least, to the erect-position position of crawler crane and mobile crane and the walking road surface checking of bearing capacity of crawler crane and mobile crane, guarantee can not damage simultaneously to original building.
Through site investigation investigation to the lifting place, there is a cycleway to lead directly to basement near 12m place, the second stage of M axis left side, be a L type basement independently under the cycleway, cycleway is the thick reinforced concrete cast-in-situ plate of 300mm, and basement retaining wall is the thick reinforced concrete wall of 500mm.Crane is held in the power soil layer scope does not have potential safety hazards such as pipe trench, aqueduct, and high altitude environment clear around crane lifting can lift.
When lifting operation, five roads of every crawler belt underlay of crane case substrate, road case substrate size is 2.3m * 5m, foundation bearing capacity calculates under the crawler belt: crane adds counterweight gross weight 380t, the heavy 130t of equipment, gross weight is about 510t.10 case substrate sizes: long 5m * wide 2.3m.Gross area 115m2.To ground pressure, demonstrate during the operation of lr1400/2 crawler belt according to Liebherr's work plan software, during the lifting overline bridge, lift heavy 130t, when principal arm and crawler belt were 45, this maximum bearing pressure was 161t, by base board to ground pressure is:
P=161/(2.3×5×3)=?4.67(t/m2)
During lifting be to the ground average pressure:
P1=(380+130)/115=4.435(t/m2)
Track-bearing area=10.4 * 1.2 * 2=24.96(m2)
During the crawler crane walking be to geostatic pressure:
P2=(380-45)/24.96=13.42(t/m2)
Crawler crane is not less than 3mm apart from the oil cellar distance by expert advice when new building 1 axis, the telecommunications manhole takes scaffold tube to reinforce support, and all the other pipe well manholes take the method for back-up sand to reinforce.
Through calculating, the crane erect-position, transition walking ground bearing pressure meets lifting requirements at the construction field (site), all can not damage original building and new building retaining wall.
Step 3 according to the angle of weight, suspension centre quantity and the boom of steel crossover, is selected wire rope and otic placode, and is checked its safety.
Select wire rope:
Shown in result of calculation, structural stress is 38MPa to the maximum; Vertical displacement is 9.2mm to the maximum; Horizontal direction length travel accumulative total is 0.99mm to the maximum, and three numerical value all do not impact installing.The lifting rope is selected 6 * 37 wire rope for use, and restrict long 12m, diameter phi 52mm (double joint), nominal tensile strength are 1700N/mm2.
Lifting gross weight: 130t
4 colligations, every some hoist cable load-bearing: 130 ÷, 4 ÷ sin60=37.53 (t)
Because hoist cable adopts two, and every is all taked double joint, every load-bearing: 37.53 ÷ 2=18.77 (t)
6 * 37+1-1700 φ 52mm wire rope pulling force allowable:
Rupture pull force summation * nonuniformity coefficient ÷ safety factor=170.5 * 0.82 ÷ 7=19.98 (t)
19.98>18.77
Therefore 6 * 37+1-1700 φ 52mm wire rope can satisfy lifting requirements.
Select otic placode:
Press steel crossover deadweight 130t and calculate, adopt 4 colligations, select S-BX55 type snap ring, snap ring lateral pin diameter is 70mm, otic placode bore diameter ф 80mm, and otic placode is selected the thick Q345B steel plate of 30mm, and design yield strength is 325N/mm2, is taken as in 90%
325x0.9=292.5(N/mm2)
The snap ring lateral pin contacts with otic placode by 1/3 lateral pin diameter and gets, and contact area is:
70÷3×30=700(mm2)
The stressed 38t that presses of single-point calculates, then the contact area desired value:
380000÷292.5=1299.15(mm2)
Therefore the otic placode hole needs reinforcing ring thickness:
(1299.15-700)÷(70÷3)=25.7(mm)
According to aforementioned calculation, reinforcing ring determines to adopt the two-sided reinforcement of the thick Q345B steel plate of 12mm.
Hanger hole and otic placode border width calculate with shearing, design shearing allowable and calculate with 175 N/mm2, and then this width is:
350000÷2÷175÷30=33.33(mm)
According to the size of selected snap ring and lifting wire rope, otic placode hole and otic placode border width permissible value are 200mm, and therefore selecting this width is 100mm, and the reinforcing ring width is 80mm.
Step 4 is set up cat ladder in the inner binding of the good steel crossover of splicing welding.
Step 5 according to calculating the hoisting point position of determining, at steel crossover design hoisting point position place's welding otic placode, is connected by snap ring wire rope with otic placode.
Step 6 is that the steel crossover is installed control line with steel crossover horizontal projection, and whole unwrapping wire is made the installation control line on ground; And in original building, ground, new building, observation point is set.
Step 7, the steel crossover is had bad luck: crawler crane enter main hang the position before, lift with mobile crane earlier, the steel crossover is moved to the installation site, and after the distance of 12 meters of the centres of gyration of the center to center distance crawler crane of steel crossover, the steel crossover lands, crawler crane enters the main position of hanging, and prepares lifting.
Step 8, the examination of steel crossover is hung; Crawler crane hoists suspension hook to steel crossover lowest part apart from ground 50 millimeters, stops lifting; Check the stress deformation of otic placode, lifting arm, check the ground cracking and the situation of sinking under the crawler crane crawler belt; Guaranteeing does not have falling object on the lifting arm; Firmly knock wire rope with pipe, guarantee that each wire rope is stressed even substantially.
Step 9 formally lifts the steel crossover; Inspection finishes, and suspension hook to the steel crossover lowest part that continues to hoist surpasses the basis, installation site, then by the rope of sauntering with the rotation of steel crossover, make the oblique commentaries on classics of steel crossover enter space between original building and new building.
Step 10 winches to steel crossover revolution directly over the basis, installation site, slowly falls suspension hook to the basis, and the centering orientation is looked for verticality; With steel crossover installation in position.
Step 11, by extracing suspension hook and wire rope at the inner cat ladder of steel crossover in advance, and the site clearing instrument.
Otic placode described in the step 3 is oblique otic placode and straight otic placode.
Described crawler crane is the lr1400/2 crawler crane, and mobile crane is the 130t mobile crane.

Claims (4)

1. large-span steel connecting bridge, for by upper chord (1), middle chord member (2), lower chord (3), the steel truss that steel column (4) and connecting rod are formed, described connecting rod comprises horizontal brace rod (5) and oblique connecting rod (12), it is characterized in that: steel crossover one end is connected by high-strength bolt with new building, the other end is connected with original building, two reinforced columns (9) are installed in the original building both sides, between bottom surface two reinforced columns of steel crossover design and installation position, new girder steel (8) is arranged, new girder steel (8) is connected with the lower chord (3) of steel crossover, lower chord (3) is a H shaped steel, the bottom flange of H shaped steel is connected with lead core rubber support (7) by high-strength bolt (6), lead core rubber support (7) is welded on the new girder steel (8), the adjacent two layers of floor position of original building respectively has a steel to support (10) on new girder steel (8), steel supports the central socket damper (11) of (10), steel supports (10) one ends and is connected by the horizontal pin node with reinforced column (9), and the other end is connected by the horizontal pin node with middle chord member (2) or upper chord (1);
Described damper is a lead damper, it is made up of lead for retractable pencil (11.1), outer sleeve (11.2) and end plate (11.3), end plate (11.3) supports (10) welding with steel, the length of outer sleeve (11.2) is greater than the length of lead for retractable pencil (11.1), the internal diameter of outer sleeve (11.2) supports the external diameter of (10) greater than steel, outer sleeve (11.2) is enclosed within steel and supports (10) outside, wherein an end and steel support (10) welding, the other end supports (10) with steel and is not connected, and steel supports between (10) and the outer sleeve (11.2) and scribbles lubrication oil in the slit.
2. the integral hoisting method of a kind of large-span steel connecting bridge according to claim 1, it is characterized in that: step is as follows:
Step 1 according to lifting weight and hoisting depth, is selected the model of crawler crane and mobile crane;
Step 2, erect-position position and lifting requirements according to crawler crane and mobile crane, to the walking road surface of crawler crane and mobile crane and the stand place mat thick sand of 50mm at least, to the erect-position position of crawler crane and mobile crane and the walking road surface checking of bearing capacity of crawler crane and mobile crane, guarantee can not damage simultaneously to original building;
Step 3 according to the angle of weight, suspension centre quantity and the boom of steel crossover, is selected wire rope and otic placode, and is checked its safety;
Step 4 is set up cat ladder in the inner binding of the good steel crossover of splicing welding;
Step 5 according to calculating the hoisting point position of determining, at steel crossover design hoisting point position place's welding otic placode, is connected by snap ring wire rope with otic placode;
Step 6 is that the steel crossover is installed control line with steel crossover horizontal projection, and whole unwrapping wire is made the installation control line on ground; And in original building, ground, new building, observation point is set;
Step 7, the steel crossover is had bad luck: crawler crane enter main hang the position before, lift with mobile crane earlier, the steel crossover is moved to the installation site, and after the distance of 12 meters of the centres of gyration of the center to center distance crawler crane of steel crossover, the steel crossover lands, crawler crane enters the main position of hanging, and prepares lifting;
Step 8, the examination of steel crossover is hung; Crawler crane hoists suspension hook to steel crossover lowest part apart from ground 50 millimeters, stops lifting; Check the stress deformation of otic placode, lifting arm, check the ground cracking and the situation of sinking under the crawler crane crawler belt; Guaranteeing does not have falling object on the lifting arm; Firmly knock wire rope with pipe, guarantee that each wire rope is stressed even substantially;
Step 9 formally lifts the steel crossover; Inspection finishes, and suspension hook to the steel crossover lowest part that continues to hoist surpasses the basis, installation site, then by the rope of sauntering with the rotation of steel crossover, make the oblique commentaries on classics of steel crossover enter space between original building and new building;
Step 10 winches to steel crossover revolution directly over the basis, installation site, slowly falls suspension hook to the basis, and the centering orientation is looked for verticality; With steel crossover installation in position;
Step 11, by extracing suspension hook and wire rope at the inner cat ladder of steel crossover in advance, and the site clearing instrument.
3. the integral hoisting method of a kind of large-span steel connecting bridge according to claim 2 is characterized in that, otic placode described in the step 3 is oblique otic placode and straight otic placode.
4. the integral hoisting method of a kind of large-span steel connecting bridge according to claim 2 is characterized in that, described crawler crane is the lr1400/2 crawler crane, and mobile crane is the 130t mobile crane.
CN2010102058259A 2010-06-22 2010-06-22 Large-span steel connecting bridge and integral hoisting method thereof Expired - Fee Related CN101845848B (en)

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CN102003074B (en) * 2010-10-15 2012-05-30 中国建筑第八工程局有限公司 Construction method for indoor long-span steel connecting bridge
CN102182139B (en) * 2011-05-11 2012-10-10 江苏沪宁钢机股份有限公司 Manufacturing method of three-crankcase steel connecting bridge
CN102777037B (en) * 2011-05-13 2014-11-26 中国建筑第八工程局有限公司 Simple and practical hoisting construction method of long-span steel girder
CN102661054B (en) * 2012-05-23 2015-05-27 中建二局第三建筑工程有限公司 Lateral reinforcing structure in whole lifting of plane steel truss and whole lifting method
CN103243927A (en) * 2013-05-24 2013-08-14 江苏南通六建建设集团有限公司 Double pole reverse operation combined hoisting construction method and double pole
CN103912128B (en) * 2014-02-28 2015-12-30 中国建筑第五工程局有限公司广州分公司 The construction method of high-altitude disjunctor steel truss
CN104196246B (en) * 2014-08-27 2016-09-07 浙江精工钢结构集团有限公司 A kind of multidirectional stressed structure partial of continuous trusse evacuates lifting construction method in situ
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