CN207048158U - Steel construction truss string structure system roof system ceiling structure - Google Patents

Steel construction truss string structure system roof system ceiling structure Download PDF

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Publication number
CN207048158U
CN207048158U CN201720989786.3U CN201720989786U CN207048158U CN 207048158 U CN207048158 U CN 207048158U CN 201720989786 U CN201720989786 U CN 201720989786U CN 207048158 U CN207048158 U CN 207048158U
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CN
China
Prior art keywords
truss
furred ceiling
spreader
davit
string
Prior art date
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Expired - Fee Related
Application number
CN201720989786.3U
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Chinese (zh)
Inventor
陈乔
陈一乔
张春辉
何嘉伟
王庆鑫
郭智云
龚欢
张伟业
朱德铭
江宏伟
龙伟辉
谢升昌
叶耀金
岑伯杨
龙健辉
黄健怡
姚汉全
许喜民
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.)
GUANGDONG CONSTRUCTION ENGINEERING GROUP Co Ltd
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GUANGDONG CONSTRUCTION ENGINEERING GROUP Co Ltd
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Priority to CN201720989786.3U priority Critical patent/CN207048158U/en
Application granted granted Critical
Publication of CN207048158U publication Critical patent/CN207048158U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model proposes a kind of steel construction truss string structure system roof system ceiling structure, including truss string structure system, roof system and furred ceiling frame, and especially, furred ceiling frame is installed on below the beam that winds up of truss string structure system by some davits;The top of some davits is vertically connected to the both sides of the beam that winds up of truss string structure system by davit connector, and the lower end of davit is provided with furred ceiling connector;Furred ceiling frame includes some furred ceiling truss elements, and the edge of furred ceiling truss element is connected with furred ceiling connector;Further furred ceiling connector is davit otic placode, is perforated thereon with otic placode, and the crossbar end of furred ceiling truss element has cross bar perforation, and furred ceiling truss element is fastenedly connected by cross bar perforation, otic placode perforation and bolt and davit;The vertical pole plug division for the one end that the end of further adjacent 2 furred ceiling truss elements passes through vertical pole is to inserting connection.The utility model is simple in construction, it is solid firmly and be easy to construct, ventilation and the installation of fire fighting device in furred ceiling can be coordinated, there is the characteristics of convenient, fast for construction and safe.

Description

Steel construction truss string structure system roof system ceiling structure
Technical field
Building construction field is the utility model is related to, the knot of furred ceiling specifically in steel construction truss string structure building Structure.
Background technology
The applicant has applied for a kind of double rope truss string structure systems of the double box beams of large span, Application No. not long ago 201520282803.0, it includes some Pin truss string structures, and truss string structure connects structure by including lower edge drag-line with the beam that winds up Into, the beam that winds up is connected and composed by 2 arc girder steels by girder steel connector, and the both ends for the beam that winds up are supported by 2 steel columns respectively, Some purlins make truss string structure be spaced connection successively between being connected to the beam that winds up of adjacent 2 Pin truss string structures.This building The construction method of middle furred ceiling is typically:Scaffold is set up in building, furred ceiling block-by-block is delivered to by the beam that winds up by lowering or hoisting gear Lower section, workmen complete being fixedly connected for furred ceiling and the joist steel beam that winds up by operating platform of scaffold again.This construction method It is disadvantageous in that:This kind of usual span of building is big, height is high, and it is very big to build the workload of scaffold, and related specifications It is required that common fastener type steel pipe scaffold scaffolding height should use other shape steel supports no more than 40 meters more than 40 meters As operating platform to ensure the security of construction, therefore cause construction cost height, low construction efficiency;It is therefore desirable to improve.
The content of the invention
The purpose of this utility model is to propose a kind of steel construction truss string structure system roof system ceiling structure, its is simple in construction, It is solid firmly and to be easy to construct, ventilation and the installation of fire fighting device in furred ceiling can be coordinated, had convenient, fast for construction and safe Feature.
The purpose of this utility model can be achieved through the following technical solutions:
Steel construction truss string structure system roof system ceiling structure, including truss string structure system, roof system and furred ceiling frame, the Zhang Xian Girder system includes some Pin truss string structures and purlin, and the truss string structure is stood by including the beam that winds up, lower edge drag-line, steel Post, strut and brace connect and compose, and the beam that winds up is the double box structures connected and composed by 2 arc girder steels, and wind up beam Both ends are supported by 2 steel columns respectively, and 2 lower edge drag-lines are connected to the both ends of 2 arc girder steels of the beam that winds up, and lower edge is drawn Strut and brace are provided between rope and arc girder steel will wind up beam, lower edge drag-line tension connection;Some purlins are connected to phase Truss string structure is set to be spaced connection successively between the beam that winds up of adjacent 2 Pin truss string structures;The roof system is spelled by some pieces of roof slab alignment Composition is connect, the roof system is fixed in the truss connecting rod of truss string structure system, and furred ceiling frame is installed on by some davits to be opened The lower section of string girder system.
The davit is vertically arranged square or round tubular structure, and the lower end of davit is provided with furred ceiling connector, some The top of root davit is vertically connected to the both sides of the beam that winds up of truss string structure by davit connector, makes the two of every Pin truss string structures There is symmetrical 2 groups of davits to arrange for side.
The furred ceiling frame includes some furred ceiling truss elements, and the furred ceiling truss element has montant and 2 layers of framed bent, institute Framed bent is stated by some cross bars and the crisscross grid framework connected and composed of some vertical poles;Some montant ends are connected to adjacent 2 Between the cross bar or vertical pole of layer framed bent.
The edge of furred ceiling truss element and the furred ceiling connector of davit connect, and some furred ceiling truss element combinations form furred ceiling Frame.
Prioritization scheme, in steel construction truss string structure system roof system ceiling structure of the present utility model, the davit lower end Furred ceiling connector is davit otic placode, has otic placode perforation, the crossbar end tool of the furred ceiling truss element on the davit otic placode There is cross bar perforation, furred ceiling truss element is fastenedly connected by cross bar perforation, the otic placode perforation of davit and bolt and davit.
Further prioritization scheme, in steel construction truss string structure system roof system ceiling structure of the present utility model, the furred ceiling The one end of the vertical pole of truss element has vertical pole plug division, and the end of adjacent 2 furred ceiling truss elements passes through vertical pole plug division To inserting connection.
Further prioritization scheme, it is described to hang in steel construction truss string structure system roof system ceiling structure of the present utility model Post connector includes spreader, screw rod and bottom plate.
The spreader is square tubular structure, has spreader wallboard in the side wall of spreader, the spreader wallboard is located at spreader Both sides there is symmetrical 2 pieces of lateral pieces, spreader is laterally located at the top of the beam that winds up of truss string structure, the lateral piece of spreader wallboard There is the wind up both sides of every arc girder steel of beam of upper correspondence symmetrical 2 pairs of screw tops to perforate;The bottom plate is four bottom hole plates, institute Stating the screw top perforation that four bottom hole plates correspond to spreader wallboard has 2 pairs of screw rod bottom holes;2 piece of four bottom hole plate is located at truss string structure Wind up the lower section of beam and corresponding up and down with the spreader wallboard of spreader.
The screw rod includes 8, and the both ends of screw rod pass through the screw top perforation on corresponding spreader and the screw rod of bottom plate Bottom hole, and top nut and bottom nut are threaded with respectively, the spreader wallboard and bottom plate for making spreader compress wind up respectively The arc girder steel of beam, realize that davit connector is fastenedly connected winding up on beam in truss string structure.
The both ends of the spreader, which are located on the lateral piece of spreader wallboard, has spreader perforation, and the top of the davit, which has, to be connected End plate is connect, there is the connection end plate davit docked with the perforation of the spreader of spreader end to perforate, and 2 davits pass through spiral shell respectively Bolt, davit perforation and spreader perforation are correspondingly connected to the both ends of the spreader of davit connector.
Further prioritization scheme, in steel construction truss string structure system roof system ceiling structure of the present utility model, the bottom Plate also includes diplopore bottom plate, and the diplopore bottom plate is the half of four bottom hole plates, has 1 pair of screw rod bottom hole, 2 pieces of diplopore bottom plates Flat raft is stacked at the lower section of 1 piece of four bottom hole plate.
The utility model has following substantive distinguishing features and progress.
1st, some furred ceiling truss elements are passed through in steel construction truss string structure system roof system ceiling structure of the present utility model Davit is assembled and is installed on the winding up on beam of steel construction truss string structure system, has and simple in construction, solid firmly and is easily installed The characteristics of.
2nd, furred ceiling truss element, davit and hung in steel construction truss string structure system roof system ceiling structure of the present utility model Post connector is fastenedly connected winding up on beam in steel construction truss string structure system successively by connectors such as bolts, realizes high-altitude work Using mechanically connecting during industry, avoid taking the destructive attended operation such as punching, welding in the air in height, be very beneficial for work high above the ground Efficiency and security.
3rd, steel construction truss string structure system roof system ceiling structure of the present utility model need not set up pin in work progress Hand cradle, installed by the way of by furred ceiling truss element segmental hoisting, there is the characteristics of convenient, fast for construction, safe, can be effective Shorten the construction period, reduce construction cost.
4th, steel construction truss string structure system roof system ceiling structure of the present utility model will need to be hidden in work progress The equipment such as ventilation, fire-fighting on furred ceiling and ornamental smallpox with being docked again after furred ceiling truss element segmental hoisting, more added with Effect improves efficiency of construction.
Brief description of the drawings
Fig. 1 is the structural representation of steel construction truss string structure system roof system ceiling structure of the present utility model.
Fig. 2 is the section view partial schematic diagram in D-D faces in Fig. 1.
Fig. 3 is the partial schematic diagram of the connection status of furred ceiling frame, davit and davit connector in Fig. 1 structures.
Fig. 4 is the attachment structure schematic diagram of davit and davit connector in Fig. 1 structures.
Fig. 5 is the partial structural diagram of furred ceiling truss element in Fig. 1 structures.
Fig. 6 is the attachment structure schematic diagram of adjacent 2 furred ceiling truss elements in Fig. 1 structures.
Fig. 7 is the attachment structure schematic diagram of davit and davit connector in Fig. 1 structures.
Fig. 8 is the structural representation of davit and davit connector in Fig. 1 structures.
Fig. 9 is step 1 and 2 Construction State schematic diagram in the construction method of roof system ceiling structure of the present utility model.
Figure 10 is step 3 and 4 Construction State schematic diagram in the construction method of roof system ceiling structure of the present utility model.
Figure 11 is step 5 and 6 Construction State schematic diagram in the construction method of roof system ceiling structure of the present utility model.
Figure 12 be roof system ceiling structure of the present utility model construction method in step 7 Construction State schematic diagram.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
Embodiment
Referring to figs. 1 to Fig. 8, a kind of steel construction truss string structure system roof system ceiling structure, including truss string structure system, roof system 2 and furred ceiling frame.
With specific reference to Fig. 1 and Fig. 2, the truss string structure system includes some Pin truss string structures 1 and purlin 16, described String truss 1 is connected and composed by including the beam that winds up, lower edge drag-line 12, steel column 13, strut 14 and brace 15, the beam that winds up It is the double box structures connected and composed by 2 arc girder steels 11, the both ends for the beam that winds up are supported by 2 steel columns 13 respectively, 2 lower edges Drag-line 12 is connected to the both ends of 2 arc girder steels 11 of the beam that winds up, and support is provided between lower edge drag-line 12 and arc girder steel 11 To wind up beam, the tension of lower edge drag-line 12 of bar 14 and brace 15 connects;Some purlins 16 are connected to adjacent 2 Pin truss string structures 1 The beam that winds up between truss string structure 1 is spaced connection successively.
With specific reference to Fig. 1, the roof system 2 is spliced to form by some pieces of roof slab alignment, and the roof system 2 is fixed on a string purlin On the purlin 16 of frame system.
Furred ceiling frame is installed on the lower section of truss string structure system by some davits 4;The furred ceiling frame includes some hang Top truss unit 3, the furred ceiling truss element 3 have montant 31 and a 2 layers of framed bent, and the framed bent is by some cross bars 32 and some vertical The crisscross grid framework connected and composed of bar 33, some ends of montant 31 are connected between the cross bar 32 of adjacent 2 layers of framed bent( Can be adjacent 2 layers of framed bent vertical pole 33 between), the both ends of cross bar 32 have cross bar perforation, the one end tool of vertical pole 33 There is vertical pole plug division 330.
With specific reference to Fig. 7 and Fig. 8, the davit 4 is vertically arranged square(Can also be circular)Tubular structure, davit 4 lower end is provided with furred ceiling connector, and the furred ceiling connector is davit otic placode 41, has otic placode perforation on the davit otic placode 41 40;The top of some davits 4 is vertically connected to the both sides of the beam that winds up of truss string structure 1 by davit connector, makes every Pin There is symmetrical 2 groups of davits to arrange for the both sides of string truss.
Include spreader 5, screw rod 6 and bottom plate with reference to reference to figure 3, Fig. 4, Fig. 7 and Fig. 8, the davit connector.
The spreader 5 is square tubular structure, by being welded to connect spreader wallboard 51, the horizontal stroke in the side wall of spreader 5 The both sides that post jamb plate 51 is located at spreader 5 have symmetrical 2 pieces of lateral pieces, and spreader 5 is laterally located at the upper of the beam that winds up of truss string structure Square, the both sides of every arc girder steel 11 of the beam that correspondingly winded up on the lateral piece of spreader wallboard 51 have 2 pairs of screw tops perforation 52;Institute State bottom plate and include four bottom hole plates 72 and diplopore bottom plate 71, the screw top perforation 52 of four bottom holes plate, the 72 corresponding spreader wallboard 51 With 2 pairs of screw rod bottom holes 70;2 piece of four bottom hole plate 72 located at the lower section of the beam that winds up of truss string structure and with the spreader wall of spreader 5 Plate corresponds to about 51;The diplopore bottom plate 71 is the half of four bottom hole plates 72, has 1 pair of screw rod bottom hole, 70,2 pieces of diplopore bottom plates 71 flat rafts are stacked at the lower section of 1 piece of four bottom hole plate 72.
The screw rod 6 includes 8, and the both ends of screw rod 6 pass through screw top perforation 52 on corresponding spreader 5 and bottom plate Screw rod bottom hole 70, and top nut 61 and bottom nut 62 are threaded with respectively, make the spreader wallboard 51 and bottom plate of spreader 5 The arc girder steel 11 for the beam that winds up is compressed respectively, realizes that davit connector is fastenedly connected winding up on beam in truss string structure.
The both ends of the spreader 5, which are located on the lateral piece of spreader wallboard 51, has spreader perforation 510, the top of the davit 4 End has connection end plate 42, and the connection end plate 42 has the davit perforation 420 docked with the spreader of the end of spreader 5 perforation 510, 2 davits 4 are correspondingly connected to the two of the spreader 5 of davit connector by bolt, davit perforation 420 and spreader perforation 510 respectively End.
The edge of furred ceiling truss element 3 is perforated by cross bar, the furred ceiling of the otic placode of davit 4 perforation 40 and bolt and davit 4 Connector connects, and the end of adjacent 2 furred ceiling truss elements 3, to inserting connection, makes some furred ceiling truss by vertical pole plug division 330 The combination of unit 3 forms furred ceiling frame.
With reference to figure 9 to Figure 12, the construction method of steel construction truss string structure system roof system ceiling structure of the present utility model, tool Body is that furred ceiling frame is set up in truss string structure system, and it comprises the following steps:
Step 1, with reference to figure 9, mark has connector on 2 arc girder steels 11 of the beam that winded up in truss string structure system Installation position, the davit connector installation position are located on strut in the range of 0.5 meter of node;Pass through the job platform of high-altitude operation vehicle As human users' platform, davit connector and davit 4 are installed successively on the beam that winds up of truss string structure system, while in Zhang Xian The installation site that furred ceiling truss element 3 is corresponded on the beam that winds up of girder system installs some electric blocks.
Step 2, with reference to figure 9, according to installation site of the furred ceiling truss element 3 in truss string structure system, by furred ceiling truss Unit 3 is in the underface of its installation site by some cross bars 32, vertical pole 33 and the on-site consolidation of montant 31 into step 1 is installed The suspension hook end of electric block be connected on furred ceiling truss element 3, the both ends of each furred ceiling truss element 3 or both sides are corresponding 2 pairs Symmetrical electric block, starting electric block makes furred ceiling truss element 3 steadily rise, and furred ceiling truss element 3 rises to distance construction Stop lifting behind 1.8 to 2.2 meters of ground, by temporary support by the temporary support of furred ceiling truss element 3.
Step 3, with reference to figure 10, inside plant, the inside plant are laid in the top of the furred ceiling truss element 3 of step 2 Include blower fan, ventilation duct 91 and fire water monitor.
Step 4, with reference to figure 10, smallpox 92 of mating formation in the bottom of the furred ceiling truss element 3 of step 3, the smallpox 92 includes The polylith ceiling for having the roof keel being connected on furred ceiling truss element 3 and being installed on roof keel is formed.
Step 5, furred ceiling truss element 3 is made to continue steadily to rise with reference to figure 11, the electric block of starting step 2, furred ceiling purlin Frame unit 3 stops lifting when rising to below the beam that winds up of truss string structure system close to the bottom of davit 4.
Step 6, with reference to figure 11, human users' platform, the operating platform are used as by the job platform of high-altitude operation vehicle On bottle gouard moved by hands is installed, the suspension hook end of bottle gouard moved by hands is connected on furred ceiling truss element 3, manually cucurbit correction furred ceiling Behind the position of truss element 3, the furred ceiling connector of the yardarm of furred ceiling truss element 3 and davit 4 is fastenedly connected.
Step 7, another furred ceiling truss element 3, adjacent 2 furred ceiling purlins are lifted with reference to figure 12, repeat step 2 to step 6 , to inserting connection fastening, after the completion of being lifted to whole furred ceiling truss elements 3, continued by vertical pole plug division 330 end of frame unit 3 Human users' platform is used as by the job platform of high-altitude operation vehicle, by the inside plant pair on adjacent 2 pieces of furred ceiling truss elements 3 It should connect, and closing in decoration construction is carried out to smallpox 92, all constructions are completed.
Furred ceiling truss element, davit and davit connect in the steel construction truss string structure system roof system ceiling structure of the present embodiment Fitting is fastenedly connected winding up on beam in steel construction truss string structure system successively by connectors such as bolts, when realizing work high above the ground Using mechanical connection, avoid taking the destructive attended operation such as punching, welding in the air in height, be very beneficial for the effect of work high above the ground Rate and security, have simple in construction, solid firmly and the characteristics of be easily installed.In addition, it is segmented using by furred ceiling truss element The mode of lifting is installed, and need not set up scaffold in work progress, while will need to be hidden in ventilation, fire-fighting on furred ceiling Etc. equipment and ornamental smallpox with being docked again after furred ceiling truss element segmental hoisting, have convenient, fast for construction, safe It feature, can effectively shorten the construction period, reduce construction cost.

Claims (5)

1. steel construction truss string structure system roof system ceiling structure, including truss string structure system, roof system(2)With furred ceiling frame, described String girder system includes some Pin truss string structures(1)And purlin(16), the truss string structure(1)By include the beam that winds up, under String drag-line(12), steel column(13), strut(14)And brace(15)Connect and compose, the beam that winds up is by 2 arc girder steels (11)The double box structures connected and composed, the both ends for the beam that winds up are respectively by 2 steel columns(13)Support, 2 lower edge drag-lines(12)Point 2 arc girder steels of the beam that winds up are not connected to(11)Both ends, lower edge drag-line(12)With arc girder steel(11)Between be provided with strut (14)And brace(15)To be winded up beam, lower edge drag-line(12)Tension connects;Some purlins(16)It is connected to adjacent 2 Pin string purlins Frame(1)The beam that winds up between make truss string structure(1)Interval connection successively;The roof system(2)By some pieces of roof slab alignment splicings Form, the roof system(2)It is fixed on the purlin of truss string structure system(16)On, it is characterised in that:Furred ceiling frame is hung by some Post(4)It is installed on the lower section of truss string structure system;
The davit(4)For vertically arranged square or round tubular structure, davit(4)Lower end be provided with furred ceiling connector, if Dry root davit(4)Top truss string structure is vertically connected to by davit connector(1)The beam that winds up both sides, make every Pin strings There is symmetrical 2 groups of davits to arrange for the both sides of truss;
The furred ceiling frame includes some furred ceiling truss elements(3), the furred ceiling truss element(3)With montant(31)With 2 layers Framed bent, the framed bent is by some cross bars(32)With some vertical poles(33)The crisscross grid framework connected and composed;Some perpendicular Bar(31)End is connected to the cross bar of adjacent 2 layers of framed bent(32)Or vertical pole(33)Between;
Furred ceiling truss element(3)Edge and davit(4)Furred ceiling connector connection, some furred ceiling truss elements(3)Combine structure Into furred ceiling frame.
2. steel construction truss string structure system roof system ceiling structure according to claim 1, it is characterised in that:The davit(4) The furred ceiling connector of lower end is davit otic placode(41), the davit otic placode(41)It is upper that there is otic placode perforation(40), the furred ceiling purlin Frame unit(3)Cross bar(32)End has cross bar perforation, furred ceiling truss element(3)Perforated by the cross bar, davit(4)Ear Plate is perforated(40)With bolt and davit(4)It is fastenedly connected.
3. steel construction truss string structure system roof system ceiling structure according to claim 2, it is characterised in that:The furred ceiling truss Unit(3)Vertical pole(33)One end there is vertical pole plug division(330), adjacent 2 furred ceiling truss elements(3)End pass through Vertical pole plug division(330)To inserting connection.
4. steel construction truss string structure system roof system ceiling structure according to claim 1, it is characterised in that:The davit connection Part includes spreader(5), screw rod(6)And bottom plate;
The spreader(5)For square tubular structure, spreader(5)Side wall on there is spreader wallboard(51), the spreader wallboard (51)Positioned at spreader(5)Both sides there is symmetrical 2 pieces of lateral pieces, spreader(5)Laterally it is located at the upper of the beam that winds up of truss string structure Side, spreader wallboard(51)Lateral piece on correspondingly wind up every arc girder steel of beam(11)Both sides there is symmetrical 2 pairs of screw rods Top perforation(52);The bottom plate is four bottom hole plates(72), the four bottom holes plate(72)Corresponding spreader wallboard(51)Screw top wear Hole(52)With 2 pairs of screw rod bottom holes(70);2 piece of four bottom hole plate(72)Located at the lower section of the beam that winds up of truss string structure and with horizontal stroke Post(5)Spreader wallboard(51)Correspond to up and down;
The screw rod(6)Include 8, screw rod(6)Both ends pass through corresponding spreader(5)On screw top perforation(52)And bottom The screw rod bottom hole of plate(70), and top nut is threaded with respectively(61)With bottom nut(62), make spreader(5)Spreader Wallboard(51)Compress the arc girder steel for the beam that winds up respectively with bottom plate(11), realize that davit connector is fastenedly connected in truss string structure Wind up on beam;
The spreader(5)Both ends be located at spreader wallboard(51)Lateral piece on have spreader perforation(510), the davit(4) Top have connection end plate(42), the connection end plate(42)Have and spreader(5)The spreader perforation of end(510)Docking Davit is perforated(420), 2 davits(4)Perforated respectively by bolt, davit(420)Perforated with spreader(510)It is correspondingly connected to hang The spreader of post connector(5)Both ends.
5. steel construction truss string structure system roof system ceiling structure according to claim 4, it is characterised in that:The bottom plate also wraps Diplopore bottom plate is included(71), the diplopore bottom plate(71)For four bottom hole plates(72)Half, there is 1 pair of screw rod bottom hole(70), 2 Block diplopore bottom plate(71)Flat raft is stacked at 1 piece of four bottom hole plate(72)Lower section.
CN201720989786.3U 2017-08-09 2017-08-09 Steel construction truss string structure system roof system ceiling structure Expired - Fee Related CN207048158U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720989786.3U CN207048158U (en) 2017-08-09 2017-08-09 Steel construction truss string structure system roof system ceiling structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720989786.3U CN207048158U (en) 2017-08-09 2017-08-09 Steel construction truss string structure system roof system ceiling structure

Publications (1)

Publication Number Publication Date
CN207048158U true CN207048158U (en) 2018-02-27

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Application Number Title Priority Date Filing Date
CN201720989786.3U Expired - Fee Related CN207048158U (en) 2017-08-09 2017-08-09 Steel construction truss string structure system roof system ceiling structure

Country Status (1)

Country Link
CN (1) CN207048158U (en)

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Granted publication date: 20180227

Termination date: 20180809