CN109267652A - A kind of connecting node and assembly technology for assembling type steel structure pillar - Google Patents

A kind of connecting node and assembly technology for assembling type steel structure pillar Download PDF

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Publication number
CN109267652A
CN109267652A CN201811210163.7A CN201811210163A CN109267652A CN 109267652 A CN109267652 A CN 109267652A CN 201811210163 A CN201811210163 A CN 201811210163A CN 109267652 A CN109267652 A CN 109267652A
Authority
CN
China
Prior art keywords
connection
rod
pillar
nut
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811210163.7A
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Chinese (zh)
Inventor
崔家春
徐继东
安东亚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
East China Architectural Design and Research Institute Co Ltd
Original Assignee
East China Architectural Design and Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by East China Architectural Design and Research Institute Co Ltd filed Critical East China Architectural Design and Research Institute Co Ltd
Priority to CN201811210163.7A priority Critical patent/CN109267652A/en
Publication of CN109267652A publication Critical patent/CN109267652A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/2415Brackets, gussets, joining plates
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/2418Details of bolting
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/2421Socket type connectors
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/2451Connections between closed section profiles
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/246Post to post connections

Abstract

The invention discloses a kind of connecting nodes and assembly technology for assembling type steel structure pillar, connecting node includes upper connection structure, lower connection structure and several bolt devices, lower connection structure includes a junction steel plate, junction steel plate one end is equipped with the first connecting pin, the other end is equipped with second connection end, second connection end can be assigned into upper connection structure, and unilateral fastening is carried out by bolt device, assembly technology are as follows: lower connection structure is arranged in the top of the steel construction pillar of lower end, upper connection structure is arranged in the bottom end of the steel construction pillar of upper end, then upper connection structure and lower connection structure are subjected to unilateral fastening by several bolt devices, to which two steel construction pillars be fixed.The configuration of the present invention is simple, it is easy for installation, the vertical connection of steel pipe column is realized, connection segment length can halve linkage section and bolt quantity by way of being inserted into nested encryptions, and can realize the Fast Installation at scene, substantially increase assembly efficiency.

Description

A kind of connecting node and assembly technology for assembling type steel structure pillar
Technical field
The present invention relates to construction steel structures, and in particular to a kind of connecting node and assembly for assembling type steel structure pillar Technique.
Background technique
Steel construction is natural fabricated construction, and assembling type steel structure building has the advantage that
1) there is no field cast-in-place node, faster, construction quality is easier to be guaranteed installation speed;
2) steel construction is ductile material, has better anti-seismic performance;
3) relative to concrete structure, steel construction self weight is lighter, and foundation cost is lower;
4) steel construction is recyclable material, more environmentally protective;
5) well-designed steel construction assembled architecture has better economy than assembly concrete building.
6) beam cross-section is smaller, can get more usable floor areas.
The column connected node of assembling type steel structure mainly uses bolt-weld joint at present, but assembling type steel structure is recommended to use spiral shell Bolt connecting node.Bolted benefit is:
1) installation speed is fast;
2) it is more easier to control construction quality.
3) field welding is the main portions (paint in-situ processing is improper) that steel construction is easy to happen corrosion, is bolted entirely Can be to avoid such position, and can accomplish that paint all by factory's coating, substantially increases the Corrosion Protection of steel construction.
In the prior art, a kind of assembling type node (CN107806273A) applied to single-layer steel structure cooling tower, the section Point structure is extremely complex, at high cost, and can not monolithic fastening, assembly efficiency is very low.
Summary of the invention
The present invention to solve the above-mentioned problems, to provide a kind of connecting node for assembling type steel structure pillar.
In order to achieve the above objectives, technical scheme is as follows:
A kind of connecting node for assembling type steel structure pillar, the connecting node include upper connection structure, lower connection Structure and several bolt devices, the lower connection structure include a junction steel plate, and described junction steel plate one end is equipped with first and connects Connect end, the other end is equipped with second connection end, and the second connection end can be assigned into upper connection structure, and by bolt device into The unilateral fastening of row, the bolt device include screw rod, interior nut, exterior nut cap, and the screw rod includes the body of rod and fixture nut, described The body of rod is equipped with connection screw thread, and the body of rod is cooperatively connected by connection screw thread and interior nut, and the body of rod bottom end is equipped with connection Slot, the link slot and external fixing piece are cooperatively connected, and external fixing piece can drive the body of rod to be rotated, so that the body of rod can Sequentially pass through interior nut, second connection end and upper connection structure, the exterior nut cap and sequentially pass through interior nut, second connection end and The body of rod of upper connection structure is threadedly coupled.
In a preferred embodiment of the invention, the upper connection structure includes a steel pipe, if the steel pipe is equipped with Dry the first connecting hole.
In a preferred embodiment of the invention, the second connection end is identical as the shape of upper connection structure, and The caliber of second connection end is less than upper connection structure, and the second connection end is equipped with several second connecting holes, and every A second connecting hole is corresponding with first connecting hole, and the body of rod is in turn through interior nut, the second connecting hole and the first connection Hole.
In a preferred embodiment of the invention, the junction steel plate is rectangle.
In a preferred embodiment of the invention, first connecting pin is rectangular cylinder.
In a preferred embodiment of the invention, the bottom end of the body of rod is arranged in the connection screw thread.
In a preferred embodiment of the invention, the interior nut and the contact surface of fixture nut are equipped with limit hole, The fixture nut can be embedded in limit hole.
A kind of assembly technology for assembling type steel structure pillar, the assembly technology are as follows: the setting of lower connection structure exists Positioned at the top of the steel construction pillar of lower end, upper connection structure is arranged in the bottom end of the steel construction pillar of upper end, then Upper connection structure and lower connection structure are subjected to unilateral fastening by several bolt devices, so that two steel construction pillars be consolidated It is fixed.
In a preferred embodiment of the invention, the unilateral fastening of bolt device specifically comprises the following steps:
(1) each interior nut is arranged on the medial surface of second connection end first, and it is each in nut and one the Two connecting hole corresponding matchings;
(2) then the body of rod is threadedly coupled with interior nut, so that the body of rod is fixed on interior nut;
(3) then upper connection structure is set in second connection end;
(4) external fixing piece is then sequentially passed through into the first connecting hole, the second connecting hole and interior nut, and assigned into bar In the link slot of body bottom end, at this moment fixing piece is connected as one with the body of rod, then the body of rod can be driven to be rotated in interior nut, After the position that body of rod bottom end is equipped with connection screw thread passes through interior nut, fixing piece directly can drive the body of rod to be moved, at this moment bar Body is in turn through the second connecting hole and the first connecting hole, thus the exposed outside in upper connection structure;
(5) last exterior nut cap to be only set on the body of rod, and be cooperatively connected with the connection screw thread on the body of rod, connect in realization Monolithic fastening between binding structure and lower connection structure.
The beneficial effects of the present invention are:
The configuration of the present invention is simple, it is easy for installation, the vertical connection of steel pipe column is realized, connection segment length is nested by insertion The mode of connection can halve linkage section and bolt quantity, and can realize the Fast Installation at scene, substantially increase assembly Efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is the structural diagram of the present invention;
Fig. 2 is the structural schematic diagram of bolt device;
Fig. 3 is the structural schematic diagram of screw rod;
Fig. 4 is assembling schematic diagram one of the invention;
Fig. 5 is assembling schematic diagram two of the invention;
Fig. 6 is assembling schematic diagram three of the invention;
Fig. 7 is assembling schematic diagram four of the invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below Conjunction is specifically illustrating, and the present invention is further explained.
Referring to Fig. 1 to Fig. 7, provided by the present invention for the connecting node of assembling type steel structure pillar comprising upper connection Structure 110, lower connection structure 120 and several bolt devices.
Upper connection structure 110 is specially the steel pipe of rectangle or other shapes, several first connecting holes are equipped on steel pipe 111。
Lower connection structure 120 includes a junction steel plate 121, and 121 one end of junction steel plate is equipped with the first connecting pin 122, another End is equipped with second connection end 123.
Junction steel plate 121 is rectangle, and its length and width is all larger than the first connecting pin 122 and second connection end 123.
Second connection end 123 is identical as the shape of upper connection structure 110, is also rectangle or the steel pipe of other shapes, and The caliber of second connection end 123 is less than upper connection structure 110, and such second connection end 123 can be assigned into upper connection structure 110 It is interior.
In second connection end 123 be equipped with several second connecting holes 1231, also, when second connection end 123 assign into When in upper connection structure 110, each second connecting hole 1231 can be corresponding with first connecting hole 111, and only needing in this way will be every A bolt device sequentially passes through the second connecting hole 1231 and the first connecting hole 111 and can tie upper connection structure 110 and lower connection Structure 120 is fixed.
First connecting pin 122 is specially rectangular cylinder.
Bolt device is to be used to for upper connection structure 110 and lower connection structure 120 being fixed, and can realize unilateral Fastening.
Bolt device includes screw rod 200, interior nut 300 and exterior nut cap 400.
Screw rod 200 specifically includes the body of rod 210 and fixture nut 220, and fixture nut 220 is fixed on the top of the body of rod 210, The body of rod 210 is equipped with connection screw thread 211.
In addition, the outer surface of 210 bottom end of the body of rod is arranged in connection screw thread 211, be not the entire outer surface of the body of rod all Setting, such screw rod 200 can be freely rotated after rotating out of certain length on interior nut 300, facilitate external adjustment.
Interior nut 300 is equipped with match corresponding with the connection screw thread 211 on the body of rod 210 for round or hexagon inside it The screw hole of conjunction is arranged on the medial surface of second connection end 123, and with the second connecting hole in second connection end 123 1231 corresponding matchings, the body of rod 210 can be threadedly coupled by connection screw thread 211 with interior nut 300, and in turn through interior nut 300, the second connecting hole 1231 and the first connecting hole 111, when the body of rod 210 is assigned into the second connecting hole 1231 and the first connecting hole When 111, interior nut 300 can be fixed on the medial surface of second connection end 123.
In addition, interior nut 300 directly can also be weldingly fixed on second connection end 123 to further increase fastness On, and the screw hole above it is corresponding with the second connecting hole 1231 in second connection end 123.
Furthermore the length that connection screw thread 211 is arranged on the body of rod 210 is greater than interior 300 interior threaded bore depth of nut, in this way can be big The big moving resistance for reducing the body of rod 210, improves assembly efficiency.
It is equipped with link slot 212 in the bottom end of the body of rod 210, link slot 212 is the work for being cooperatively connected with external fixing piece Making personnel can be by sequentially passing through fixing piece in the first connecting hole 111 and the second connecting hole 1231 insertion link slot 212, then The body of rod 210 is rotated by fixing piece, so that the connection screw thread 211 on the body of rod 210 and the screw hole in interior nut 300 rotate and connect It connects, then after the body of rod 210 for having connection screw thread 211 passes through interior nut 300, fixing piece can drive the body of rod 210 successively to wear The second connecting hole 1231 and the first connecting hole 111 are crossed, then the exposed outside in upper connection structure 110.
Link slot 212 is concretely round, and screw thread is equipped in link slot 212, can pass through external screw rod and bar in this way The rotation of body 210 is fixed, and the body of rod 210 is driven to be rotated.
Link slot 212 can also be specifically the shapes such as rectangle, hexagon, in this way can will be with 212 shape corresponding matching of link slot The body of rod insertion link slot 212 in, then drive the body of rod 210 rotated.
It is then exposed in upper connection structure when the body of rod 210 sequentially passes through the second connecting hole 1231 and the first connecting hole 111 When 110 outside, exterior nut cap 400 can be set on the body of rod 210, and be cooperatively connected with the connection screw thread 211 on the body of rod 210, To realize the fixation of upper connection structure 110 and lower connection structure 120.
Exterior nut cap is specially hexagon.
In addition, before outer nut is set on the body of rod 210 neonychium 500 can be arranged on the present body of rod 210.
In order to further increase fastness, it is equipped with limit hole 310 on interior nut 300 and the contact surface of fixture nut 220, Limit hole 310 is specially hexagon, and when fixture nut 220 is contacted with interior nut 300, fixture nut 220 can be integrally embedded in In limit hole 310, such screw rod 200 would not loosen.
A kind of assembly technology for assembling type steel structure pillar is also disclosed in implementation based on above scheme, the application, Are as follows: lower connection structure 120 is arranged in the top of the steel construction pillar of lower end, upper connection structure 110 is arranged in The bottom end of the steel construction pillar of upper end, then by upper connection structure 110 and lower connection structure 120 by several bolt devices into The unilateral fastening of row, so that two steel construction pillars be fixed.
Wherein, the unilateral fastening of bolt device specifically comprises the following steps:
(1) each interior nut 300 is arranged on the medial surface of second connection end 123 first, and it is each in nut with One 1231 corresponding matching of the second connecting hole;
(2) then the body of rod 210 is threadedly coupled with interior nut 300, so that the body of rod 210 is fixed on interior nut 300;
(3) then upper connection structure 110 is set in second connection end 123, and the first connecting hole 111 and second is connected Connect the one-to-one correspondence of hole 1231;
(4) external fixing piece is then sequentially passed through into the first connecting hole 111, the second connecting hole 1231 and interior nut 300, And assign into the link slot 212 of 210 bottom end of the body of rod, at this moment fixing piece is connected as one with the body of rod 210, then can drive the body of rod 210 are rotated in interior nut 300, after the position that 210 bottom end of the body of rod is equipped with connection screw thread 211 passes through interior nut 300, Gu Determining part can directly drive the body of rod 210 to be moved, and at this moment the body of rod 210 is in turn through the second connecting hole 1231 and the first connecting hole 110, thus the exposed outside in upper connection structure 110;
(5) last exterior nut cap 400 to be only set on the body of rod 210, and cooperate with the connection screw thread 211 on the body of rod 210 Connection, to realize the monolithic fastening between upper connection structure 110 and lower connection structure 120.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (9)

1. a kind of connecting node for assembling type steel structure pillar, which is characterized in that the connecting node includes upper connection knot Structure, lower connection structure and several bolt devices, the lower connection structure include a junction steel plate, and described junction steel plate one end is set There is the first connecting pin, the other end is equipped with second connection end, and the second connection end can be assigned into upper connection structure, and pass through spiral shell Pin device carries out unilateral fastening, and the bolt device includes screw rod, interior nut, exterior nut cap, and the screw rod includes the body of rod and fixation Nut, the body of rod are equipped with connection screw thread, and the body of rod is cooperatively connected by connection screw thread and interior nut, the body of rod bottom end Equipped with link slot, the link slot and external fixing piece are cooperatively connected, and external fixing piece can drive the body of rod to be rotated, make The body of rod in turn through interior nut, second connection end and upper connection structure, the exterior nut cap and sequentially pass through interior nut, second The body of rod of connecting pin and upper connection structure is threadedly coupled.
2. a kind of connecting node for assembling type steel structure pillar according to claim 1, which is characterized in that on described Connection structure includes a steel pipe, and the steel pipe is equipped with several first connecting holes.
3. a kind of connecting node for assembling type steel structure pillar according to claim 2, which is characterized in that described Two connecting pins are identical as the shape of upper connection structure, and the caliber of second connection end be less than upper connection structure, described second Connecting pin is equipped with several second connecting holes, and each second connecting hole is corresponding with first connecting hole, and the body of rod can Sequentially pass through interior nut, the second connecting hole and the first connecting hole.
4. a kind of connecting node for assembling type steel structure pillar according to claim 1, which is characterized in that the company Connecing steel plate is rectangle.
5. a kind of connecting node for assembling type steel structure pillar according to claim 1, which is characterized in that described One connecting pin is rectangular cylinder.
6. a kind of connecting node for assembling type steel structure pillar according to claim 1, which is characterized in that the company Connect the bottom end that the body of rod is arranged in screw thread.
7. a kind of connecting node for assembling type steel structure pillar according to claim 1, which is characterized in that in described Nut and the contact surface of fixture nut are equipped with limit hole, and the fixture nut can be embedded in limit hole.
8. a kind of assembly technology for assembling type steel structure pillar, which is characterized in that the assembly technology are as follows: tie lower connection Structure is arranged in the top of the steel construction pillar of lower end, and upper connection structure is arranged in the bottom of the steel construction pillar of upper end Then upper connection structure and lower connection structure are carried out unilateral fastening by several bolt devices, thus by two steel knots by end Structure pillar is fixed.
9. a kind of connecting node for assembling type steel structure pillar according to claim 8, which is characterized in that bolt dress The unilateral fastening set specifically comprises the following steps:
(1) each interior nut is arranged on the medial surface of second connection end first, and each interior nut and one second company Connect hole corresponding matching;
(2) then the body of rod is threadedly coupled with interior nut, so that the body of rod is fixed on interior nut;
(3) then upper connection structure is set in second connection end;
(4) external fixing piece is then sequentially passed through into the first connecting hole, the second connecting hole and interior nut, and assigned into body of rod bottom In the link slot at end, at this moment fixing piece is connected as one with the body of rod, then the body of rod can be driven to be rotated in interior nut, be worked as bar After the position that body bottom end is equipped with connection screw thread passes through interior nut, fixing piece directly can drive the body of rod to be moved, and at this moment the body of rod can The second connecting hole and the first connecting hole are sequentially passed through, thus the exposed outside in upper connection structure;
(5) last exterior nut cap to be only set on the body of rod, and be cooperatively connected with the connection screw thread on the body of rod, knot is connected in realization Monolithic fastening between structure and lower connection structure.
CN201811210163.7A 2018-10-17 2018-10-17 A kind of connecting node and assembly technology for assembling type steel structure pillar Pending CN109267652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811210163.7A CN109267652A (en) 2018-10-17 2018-10-17 A kind of connecting node and assembly technology for assembling type steel structure pillar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811210163.7A CN109267652A (en) 2018-10-17 2018-10-17 A kind of connecting node and assembly technology for assembling type steel structure pillar

Publications (1)

Publication Number Publication Date
CN109267652A true CN109267652A (en) 2019-01-25

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Application Number Title Priority Date Filing Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110080391A (en) * 2019-05-06 2019-08-02 重庆大学 Assembled detachable steel tube concrete column reinforcing joint construction method
CN110409607A (en) * 2019-08-02 2019-11-05 中国航空规划设计研究总院有限公司 A kind of steel structure system and its design method of the connection of assembled column pestle
CN110616805A (en) * 2019-08-23 2019-12-27 重庆三峡学院 Steel structure anti-seismic node for fabricated building

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110080391A (en) * 2019-05-06 2019-08-02 重庆大学 Assembled detachable steel tube concrete column reinforcing joint construction method
CN110409607A (en) * 2019-08-02 2019-11-05 中国航空规划设计研究总院有限公司 A kind of steel structure system and its design method of the connection of assembled column pestle
CN110409607B (en) * 2019-08-02 2020-10-09 中国航空规划设计研究总院有限公司 Design method of steel structure system connected by assembled column pestles
CN110616805A (en) * 2019-08-23 2019-12-27 重庆三峡学院 Steel structure anti-seismic node for fabricated building
CN110616805B (en) * 2019-08-23 2021-02-09 重庆三峡学院 Steel structure anti-seismic node for fabricated building

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