CN103669845B - High-altitude long-span overhung cornice formwork bracing system and construction method thereof - Google Patents
High-altitude long-span overhung cornice formwork bracing system and construction method thereof Download PDFInfo
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- 238000009415 formwork Methods 0.000 title claims abstract description 52
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Abstract
Description
Technical field
The present invention relates to building high and medium Long-span Cantilever cornice technical field of construction, be specifically related to a kind of formwork bracing system and construction method thereof of high-altitude long-span overhung cornice.
Background technology
Along with modern building design pursues individual character and visual effect, the be everlasting top exterior walls of building of highrise building arranges cornice of encorbelmenting, to meet using function and demand handsome in appearance.As shown in Figure 1, have in the top-out structure of the highrise building of high-altitude long-span overhung cornice, comprise third layer 105 and cornice 100 of encorbelmenting under the second layer 104 under first floor 103 under deck 101, shear wall 102, deck, deck, deck.Cornice 100 of encorbelmenting are built in the external wall of upper portion of the shear wall 102 of first floor 103 under deck, and are connected with shear wall 102 one.Under deck 101, deck under first floor 103 and deck the second layer 104 when building construction, be equipped with inner bearing frame, the bearing frame of each layer is made up of by being connected securing member with corresponding montant bearing frame horizon bar 101-1, bearing frame horizon bar 103-1, bearing frame horizon bar 104-1.Cornice 100 of encorbelmenting are built on the body of wall 102 under the deck 101 of highrise building, and outwards encorbelment and stretch out.It is high that this type of high-altitude long-span overhung cornice span is large, distance ground is high, working load large, formwork bracing system builds difficulty.Conventional is console mode bracing frame system and construction method for building the formwork bracing system of these type of high-altitude long-span overhung cornice, it by successively building bearing frame and construction scaffolding from ground base, until close to the construction formwork building cornice of encorbelmenting during construction ceiling layer again, and then the construction construction of the cornice that carry out encorbelmenting.This kind of console mode bracing frame system and construction method, build and remove the manpower all needing at substantial, needs to use a large amount of material and artificial built, and it is complicated loaded down with trivial details to build construction, construction costs is high, the construction period is long and and working security not high.
Summary of the invention
The object of the invention is: overcome the deficiencies in the prior art, provide a kind of construct simple, be easy to operate, remove convenience, reduction of erection time, cost-saving employing wire rope inclined-pulling cantilever steel girder, cantilever steel girder build and support stressed platform, adopt diagonal brace steel pipe to carry out secondary to the bearing frame column supported on stressed platform to unload to reduce formwork bracing system and the construction method thereof that vertical rod passes to the high-altitude long-span overhung cornice of cantilever steel girder load simultaneously.
Technical scheme of the present invention is: the formwork bracing system of high-altitude long-span overhung cornice of the present invention, comprises outer protective scaffold and cornice formwork; Its design feature is: also comprise cantilever steel girder, cantilever steel girder fixing hoop, anchoring ring, wire rope drag-line, operating platform and load-bearing frame of overhanging structure;
Above-mentioned cantilever steel girder is provided with draw ring, vertical rod grafting keeper and angle steel; Draw ring arranges 2 about being arranged on the right half of cantilever steel girder, and draw ring welds with cantilever steel girder; Vertical rod grafting keeper perpendicular to cantilever steel girder upper surface and weld with in the middle part of cantilever steel girder end face; The quantity and spacing that vertical rod grafting keeper is arranged on cantilever steel girder is determined according to design; Angle steel is provided with one on cantilever steel girder 1, and angle steel is welded on the left part of the bottom of cantilever steel girder; Quantity and the mutual spacing of cantilever steel girder are determined according to design;
Cantilever steel girder fixing hoop comprises 2 φ 16 clip reinforcing bars, 1 block pressur plate and 2 nut compositions; The quantity of cantilever steel girder fixing hoop is determined according to design; What 2 clip steel bar preassemblings of cantilever steel girder fixing hoop were embedded in third layer under the deck in house balances in plate; Quantity and the setting position of cantilever steel girder fixing hoop are determined according to design;
Wire-rope sling is embedded on the shear wall under the deck in house under first floor and deck between the second layer in advance; The quantity of suspension ring is 2 times of cantilever steel girder quantity; The setting position of each suspension ring is determined according to design;
The quantity of wire rope drag-line is 2 times of cantilever steel girder quantity;
The plate that balances of each cantilever steel girder third layer under deck be arranged in parallel; What the left end of each cantilever steel girder was fixed on third layer under deck by cantilever steel girder fixing hoop balances on plate; And by the Vierendeel girder close contact that balances of third layer under its angle steel and deck; The right-hand member of each cantilever steel girder is fixedly connected with one end of 2 wire rope drag-lines respectively by the draw ring of 2 on it; The other end of wire rope drag-line is fixedly connected with corresponding 1 wire-rope sling respectively;
Operating platform comprises flitch and template; Operating platform is full paving between each cantilever steel girder;
Load-bearing frame of overhanging structure comprises vertical rod, horizon bar and connection securing member; The quantity of vertical rod, horizon bar and connector is determined according to design; Each vertical rod is vertically arranged, and each vertical rod is fixed by the vertical rod grafting keeper grafting that its lower end is corresponding on each cantilever steel girder respectively; Each vertical rod adopts connector spreading; Each horizon bar layering horizontal parallel is arranged; Each horizon bar and corresponding vertical rod adopt connector spreading;
Above-mentioned outer protective scaffold is fixedly installed on the right side of load-bearing frame of overhanging structure; Cornice formwork is fixedly installed on the top of load-bearing frame of overhanging structure;
Secondary unloading assembly comprises diagonal brace steel pipe, shear wall place strong point steel pipe, side bar place strong point steel pipe and is connected securing member; Diagonal brace steel pipe, shear wall place strong point steel pipe, side bar place strong point steel pipe are determined according to design with the quantity being connected securing member; The longitudinal pitch of each diagonal brace steel pipe is identical with the spacing of cantilever steel girder; What each shear wall place strong point steel pipe and side bar place strong point steel pipe to be embedded under deck the second layer under first floor and deck respectively balances on plate, and its pre-buried position is determined according to design; The top of each diagonal brace steel pipe is fixedly connected with the top of corresponding vertical rod by connecting securing member; By connecting, securing member is corresponding to be fixedly connected with shear wall place strong point steel pipe or side bar place strong point steel pipe in the bottom of each diagonal brace steel pipe.
Further scheme is: the material of above-mentioned cantilever steel girder is 16# GB Q235 i iron; The material of draw ring is φ 20 round steel; Vertical rod grafting keeper is φ 20 round steel chieftain keeper, is highly 100mm; The clip reinforcing bar of cantilever steel girder fixing hoop is φ 16 reinforcing bar; Angle steel is the angle steel of the L100*8 of 50mm length; Wire rope drag-line is the wire rope of φ 24.5.
Further scheme is: the right-hand member of above-mentioned each cantilever steel girder upwards raises 5cm by wire rope drag-line.
Further scheme also has: each layer horizon bar of above-mentioned load-bearing frame of overhanging structure be correspondingly mutually permanently connected with the bearing frame of the second layer under the bearing frame of first floor under the bearing frame of deck, deck and deck be respectively no less than 3 across.
Adopt above-mentioned high-altitude long-span overhung cornice formwork bracing system to build a construction method for high-altitude long-span overhung cornice, it is characterized in that: comprise the following steps:
1. cantilever steel girder is made: welding arranges draw ring, vertical rod grafting keeper and angle steel on every root cantilever steel girder;
2. built-in fitting is set: after the plate reinforcing bar binding that balances of third layer completes under deck, at the pre-buried cantilever steel girder fixing hoop on plate that balances, each cantilever steel girder fixing hoop is placed in by its 2 clip reinforcing bars plate bottom layer of the reinforcing steel top of balancing, and fixes with plate bottom muscle steel wire lashing of balancing; Shear wall under deck under first floor and deck between the second layer arranges wire-rope sling; Under deck under first floor and deck the second layer the plate that balances on the shear wall place strong point steel pipe of pre-buried secondary unloading assembly and side bar place strong point steel pipe;
3. cantilever steel girder is installed: to be placed into position by each cantilever steel girder made and after the Vierendeel girder that balances of third layer is close under making the angle steel on cantilever steel girder and deck, one end of cantilever steel girder is fixed by cantilever steel girder fixing hoop; 2 of cantilever steel girder draw rings are fixedly connected with one end of 1 wire rope drag-line respectively; The other end of wire rope drag-line is fixedly connected with 1 wire-rope sling;
4. operating platform is built: completely spread by flitch and template between each cantilever steel girder 1 and be built into operating platform;
5. build load-bearing frame of overhanging structure: each vertical rod fixed by the vertical rod grafting keeper grafting that its lower end is corresponding on each cantilever steel girder, vertical rod adopts connector spreading; Each horizon bar is fixedly connected with by being connected securing member with corresponding vertical rod; Horizon bar adopts connector spreading;
6. outer protective scaffold is built: outer protective scaffold and load-bearing frame of overhanging structure are synchronously built;
7. cornice formwork is built: build cornice formwork in the upper end of load-bearing frame of overhanging structure according to design scheme;
8. the diagonal brace steel pipe of secondary unloading assembly is installed: top secondary being unloaded each diagonal brace steel pipe of assembly is fixedly connected with the top of corresponding vertical rod by connecting securing member; By connecting, securing member is corresponding to be fixedly connected with shear wall place strong point steel pipe or side bar place strong point steel pipe in the bottom of each diagonal brace steel pipe;
9. cornice of encorbelmenting are constructed: assembling reinforcement in cornice formwork, concreting make cornice of encorbelmenting;
10. removing cornice formwork bracing system of encorbelmenting: cornice construction is complete when encorbelmenting, after the intensity that maintenance reaches designing requirement, removing according to the order contrary with building order cornice formwork bracing system of encorbelmenting.
Further scheme is: above-mentioned step 3. in by wire rope drag-line, cantilever steel girder right-hand end is upwards raised 5cm.
Further scheme also has: above-mentioned each layer horizon bar be corresponding be mutually permanently connected with the bearing frame of the second layer under the bearing frame of first floor under the bearing frame of deck, deck and deck be respectively no less than 3 across.
The present invention has positive effect: the formwork bracing system of (1) high-altitude long-span overhung cornice of the present invention, build by adopting wire rope inclined-pulling cantilever steel girder, on cantilever steel girder and support stressed platform and encorbelment cornice construction formwork and construction scaffolding, than traditional console mode formwork bracing system, the quantity of steel pipe scaffold can be reduced significantly, reduce labor intensity, and construction occupied ground is little, is convenient to interchange operation.(2) formwork bracing system of high-altitude long-span overhung cornice of the present invention, by arranging diagonal brace steel pipe, scaffold and the load born thereof are carried out secondary unloading, reduces stressed to cantilever steel girder of whole bearing system, add stability and the safety of whole bracing frame.(3) the formwork bracing system construction method of high-altitude long-span overhung cornice of the present invention is simple and reliable, and construction technology is easily grasped, and use description of materials few, it is convenient to remove, can effective reduction of erection time, saving construction cost cost.
Accompanying drawing explanation
Fig. 1 is a kind of partial cutaway schematic of the building with high-altitude long-span overhung cornice; Inside bearing frame during architecture noumenon construction is also show in figure;
Fig. 2 is the section of structure of high-altitude long-span overhung cornice formwork bracing system of the present invention, also show the partial structurtes on highrise building top and cornice of encorbelmenting in figure;
Fig. 3 is the connection diagram of the pre-buried strong point steel pipe in shear wall place of diagonal brace steel pipe in Fig. 2 and building;
Fig. 4 is the connection diagram of the pre-buried strong point steel pipe in side bar place of diagonal brace steel pipe in Fig. 2 and building;
Fig. 5 is that in Fig. 2, cantilever steel girder and third layer under the deck of building balance the partial schematic diagram that Vierendeel girder is connected; The annexation of vertical rod in support bracket and cantilever steel girder is also show in figure.
Fig. 6 be under the deck of part of horizontal bar in Fig. 2 in support bracket and building first floor to the bearing frame annexation schematic diagram in third layer;
Fig. 7 is the flow chart of the construction method of high-altitude long-span overhung cornice of the present invention.
Reference numeral in above-mentioned accompanying drawing is as follows:
To encorbelment cornice 100, deck 101, bearing frame horizon bar 101-1, shear wall 102, first floor 103 under deck, bearing frame 103-1, the second layer 104 under deck, bearing frame 104-1, third layer 105 under deck;
Cantilever steel girder 1, draw ring 11, vertical rod grafting keeper 12, angle steel 13,
Cantilever steel girder fixing hoop 2,
Wire-rope sling 3,
Wire rope drag-line 4,
Operating platform 5,
Load-bearing frame of overhanging structure 6, vertical rod 61, horizon bar 62,
Outer protective scaffold 7,
Cornice formwork 8,
Secondary unloading assembly 9, diagonal brace steel pipe 91, shear wall place strong point steel pipe 92, side bar place strong point steel pipe 93.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
(embodiment 1)
See Fig. 2 to Fig. 6, the high-altitude long-span overhung cornice formwork bracing system of the present embodiment, forms primarily of cantilever steel girder 1, cantilever steel girder fixing hoop 2, wire-rope sling 3, wire rope drag-line 4, operating platform 5, load-bearing frame of overhanging structure 6, outer protective scaffold 7 and cornice formwork 8.
Preferably adopt 16# GB Q235 i iron in cantilever steel girder 1 the present embodiment, cantilever steel girder 1 is provided with draw ring 11, vertical rod grafting keeper 12 and angle steel 13.The material of draw ring 11 is φ 20 round steel, and draw ring 11 is arranged on the right part of cantilever steel girder 1, and a point left and right arranges 2, and draw ring 11 welds with cantilever steel girder 1.Vertical rod grafting keeper 12 is φ 20 round steel chieftain keeper, is highly 100mm; Vertical rod grafting keeper 12 is welded in the middle part of the end face of cantilever steel girder 1 perpendicular to the upper surface of cantilever steel girder 1; The quantity and spacing that vertical rod grafting keeper 12 is arranged on cantilever steel girder 1 is determined according to design.The angle steel of the long L100*8 of 50mm is preferably adopted in angle steel 13 the present embodiment; Angle steel 13 is provided with one on cantilever steel girder 1, and angle steel 13 is welded on the bottom left part of cantilever steel girder 1.
Cantilever steel girder fixing hoop 2 is made up of 2 φ 16 clip reinforcing bars, 1 block pressur plate and 2 nuts.The quantity of cantilever steel girder fixing hoop 2 is determined according to design.2 clip reinforcing bars of cantilever steel girder fixing hoop 2 are after under deck, the plate reinforcing bar binding that balances of third layer 105 completes, and balancing pre-buried on plate, clip reinforcing bar is placed in plate bottom layer of the reinforcing steel top of balancing, and fixes with tying up a colligation with the plate bottom muscle that balances.
Wire-rope sling 3 is embedded on the shear wall 102 under deck under first floor 103 and deck between the second layer 104 in advance.
The wire rope of φ 24.5 is preferably adopted in wire rope drag-line 4 the present embodiment.
Spacing between the quantity of aforesaid cantilever steel girder 1 and each cantilever steel girder 1 is determined according to design; The quantity of wire-rope sling 3 and wire rope drag-line 4 is 2 times of the quantity of cantilever steel girder 1.On the plate that balances of each cantilever steel girder 1 third layer 105 under deck, point front and back be arranged in parallel; What the left end of each cantilever steel girder 1 was fixed on third layer 105 under deck by cantilever steel girder fixing hoop 2 balances on plate; And by the balance Vierendeel girder close contact of its angle steel 13 with third layer 105 under deck; The right-hand member of each cantilever steel girder 1 is fixedly connected with one end of 2 wire rope drag-lines 4 by the draw ring of 2 on it 11; The other end of wire rope drag-line 4 is fixedly connected with corresponding 1 wire-rope sling 3 respectively.
Preferably, the right-hand member of each cantilever steel girder 1 upwards raises 5cm by wire rope drag-line 4, with overcome the load-bearing of each cantilever steel girder 1 stressed time the downward amount of deflection that produces, prevent the basis of bracing frame from producing the bracing frame that brings of sedimentation overall unstable.
Operating platform 5 flitch and template composition.Operating platform 5 is full paving between each cantilever steel girder 1.
Load-bearing frame of overhanging structure 6 is primarily of vertical rod 61, horizon bar 62 and be connected securing member composition.The quantity of vertical rod 61, horizon bar 62 and connector is determined according to design.The vertical parallel setting of each vertical rod 61, each vertical rod 61 is fixed by vertical rod grafting keeper 12 grafting that its lower end is corresponding on cantilever steel girder 1 respectively; Each vertical rod 61 adopts connector spreading; Each horizon bar 62 layering horizontal parallel is arranged; Each horizon bar 62 is also fixedly connected with by being connected securing member with corresponding vertical rod 61 vertical connection.
See Fig. 6, preferably, each layer horizon bar 62 of load-bearing frame of overhanging structure 6 be correspondingly mutually permanently connected with the bearing frame 104-1 of the second layer 104 under the bearing frame 103-1 of first floor 103 under the bearing frame 101-1 of deck 101, deck and deck be respectively no less than 3 across.
Outer protective scaffold 7 is made up of double-pole scaffold, Dense mesh screen and safety net.Outer protective scaffold 7 is fixedly installed on the right side of load-bearing frame of overhanging structure 6, and outer protective scaffold 7 is fixedly connected with load-bearing frame of overhanging structure 6 by its skeleton.
The shape of cornice formwork 8 is determined according to the shape of the cornice of encorbelmenting of required construction.Cornice formwork 8 is fixedly installed on the top of load-bearing frame of overhanging structure 6.
Secondary unloading assembly 9 is primarily of diagonal brace steel pipe 91, shear wall place strong point steel pipe 92, side bar place strong point steel pipe 93 and be connected securing member composition.Diagonal brace steel pipe 91, shear wall place strong point steel pipe 92, side bar place strong point steel pipe 93 are determined according to design with the quantity being connected securing member.The longitudinal pitch of each diagonal brace steel pipe 91 is identical with the spacing of cantilever steel girder 1.Each shear wall place strong point steel pipe 92 and side bar place strong point steel pipe 93 to be embedded under deck balancing on plate of the second layer 104 under first floor 103 and deck respectively.The top of each diagonal brace steel pipe 91 is fixedly connected with the top of corresponding vertical rod 61 by connecting securing member; By connecting, securing member is corresponding to be fixedly connected with shear wall place strong point steel pipe 92 or side bar place strong point steel pipe 93 in the bottom of each diagonal brace steel pipe 91.The deadweight that secondary unloading assembly 9 can make module carrier and the load bearing part born thereof are delivered to constructure body structure by diagonal brace steel pipe 91, thus reach the object of secondary off-load, ensure the resistance to overturning of whole bearing frame system of encorbelmenting.
See Fig. 7, the construction method of the high-altitude long-span overhung cornice of the present embodiment, mainly comprises the following steps:
1. cantilever steel girder is made: welding arranges draw ring 11, vertical rod grafting keeper 12 and angle steel 13 on the steel I-beam of every root as cantilever steel girder 1.
2. arrange built-in fitting: after the plate reinforcing bar binding that balances of third layer 105 completes under deck, at the pre-buried cantilever steel girder fixing hoop 2 on plate that balances, quantity and the position of pre-buried cantilever steel girder fixing hoop 2 are determined according to design; Each cantilever steel girder fixing hoop 2 is placed in by its 2 clip reinforcing bars plate bottom layer of the reinforcing steel top of balancing, and fixes with plate bottom muscle steel wire lashing of balancing; Shear wall 102 under deck under first floor 103 and deck between the second layer 104 arranges row's wire-rope sling 3; Under deck under first floor 103 and deck the second layer 104 the plate that balances on the shear wall place strong point steel pipe 92 of pre-buried secondary unloading assembly 9 and side bar place strong point steel pipe 93; Quantity and the concrete burial place of shear wall place strong point steel pipe 92 and side bar place strong point steel pipe 93 are determined according to design.
3. cantilever steel girder is installed: to be placed into position by each cantilever steel girder 1 made and after making angle steel on cantilever steel girder 1 13 and under deck, the Vierendeel girder that balances of third layer 105 being close to, one end of cantilever steel girder 1 is fixed by cantilever steel girder fixing hoop 2; 2 of cantilever steel girder 1 draw rings 11 are fixedly connected with one end of 1 wire rope drag-line 4 respectively; The other end of wire rope drag-line 4 is fixedly connected with 1 wire-rope sling 3, and by wire rope drag-line 4, cantilever steel girder 1 is pulled upwardly 5cm.
4. operating platform is built: be built into operating platform 5 by flitch and template paving full between each cantilever steel girder 1.
5. load-bearing frame of overhanging structure is built: each vertical rod 61 fixed by vertical rod grafting keeper 12 grafting that its lower end is corresponding on each cantilever steel girder 1, vertical rod 61 adopts connector spreading; Each horizon bar 62 layering horizontal parallel is arranged; Each horizon bar 62 is also fixedly connected with by being connected securing member with corresponding vertical rod 61 vertical connection; Horizon bar 62 adopts connector spreading; Each layer horizon bar 62 be corresponding be mutually permanently connected with the bearing frame 104-1 of the second layer 104 under the bearing frame 103-1 of first floor 103 under the bearing frame 101-1 of deck 101, deck and deck be respectively no less than 3 across.
6. outer protective scaffold is built: outer protective scaffold 7 and load-bearing frame of overhanging structure 6 are synchronously built, the support body of outer protective scaffold 7 is fixedly connected with load-bearing frame of overhanging structure 6 by connecting securing member, outside the support body of then protective scaffold 7 outside, Dense mesh screen is installed, inside the support body of protective scaffold 7 outside, safety net is installed;
7. cornice formwork is built: build cornice formwork 8 in the upper end of load-bearing frame of overhanging structure 6 according to design scheme.
8. the diagonal brace steel pipe of secondary unloading assembly is installed: top secondary being unloaded each diagonal brace steel pipe 91 of assembly 9 is fixedly connected with the top of corresponding vertical rod 61 by connecting securing member; By connecting, securing member is corresponding to be fixedly connected with shear wall place strong point steel pipe 92 or side bar place strong point steel pipe 93 in the bottom of each diagonal brace steel pipe 91.
9. cornice of encorbelmenting are constructed: assembling reinforcement in cornice formwork 8, concreting make cornice 100 of encorbelmenting.
10. removing cornice formwork bracing system of encorbelmenting: cornice 100 are constructed complete when encorbelmenting, after the intensity that maintenance reaches designing requirement, removing according to the order contrary with building order cornice formwork bracing system of encorbelmenting.
In sum, the formwork bracing system of the high-altitude long-span overhung cornice of the present embodiment, build by adopting wire rope inclined-pulling cantilever steel girder, on cantilever steel girder and support stressed platform and encorbelment cornice construction formwork and construction scaffolding, than traditional console mode formwork bracing system, the quantity of steel pipe scaffold can be reduced significantly, reduce labor intensity, and construction occupied ground is little, is convenient to interchange operation; By arranging diagonal brace steel pipe, scaffold and the load born thereof being carried out secondary unloading, reducing stressed to cantilever steel girder of whole bearing system, adding stability and the safety of whole bracing frame.The formwork bracing system construction method of the high-altitude long-span overhung cornice of the present embodiment is simple and reliable, and construction technology is easily grasped, and use description of materials few, it is convenient to remove, can effective reduction of erection time, saving construction cost cost.
Above embodiment is the explanation to the specific embodiment of the present invention; but not limitation of the present invention; person skilled in the relevant technique without departing from the spirit and scope of the present invention; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present invention.
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| CN103993666A (en) * | 2014-05-16 | 2014-08-20 | 永升建设集团有限公司 | Improved supporting system construction method suitable for large overhung outer floating plate roof |
| CN104900136B (en) * | 2015-05-29 | 2018-02-27 | 长沙理工大学 | A kind of experiment cable-stayed bridge and installation method |
| CN105971274A (en) * | 2016-06-13 | 2016-09-28 | 中国建筑第二工程局有限公司 | Overhanging support frame formwork system and construction method thereof |
| CN106121225B (en) * | 2016-08-24 | 2018-05-11 | 仇国辉 | Suspension active erecting device is chosen outside cast-in-place concrete eaves |
| CN106193592A (en) * | 2016-08-29 | 2016-12-07 | 成都市第四建筑工程公司 | A kind of form bracing system and construction method |
| CN106988520B (en) * | 2017-03-01 | 2020-06-09 | 中国建筑第八工程局有限公司 | Construction method and support system for high-rise suspension structure |
| CN108104453A (en) * | 2017-11-30 | 2018-06-01 | 中国二十冶集团有限公司 | Cantilevered structure construction method |
| CN110388000A (en) * | 2019-07-31 | 2019-10-29 | 杭州悦为科技有限公司 | The cast-in-place overhanging beam construction method of multilayer fashioned iron-drag-line dimensional support super-span |
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