CN106193306B - A kind of long-span hangar fringe truss prestressed structural systems and its construction method - Google Patents
A kind of long-span hangar fringe truss prestressed structural systems and its construction method Download PDFInfo
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- CN106193306B CN106193306B CN201610678210.5A CN201610678210A CN106193306B CN 106193306 B CN106193306 B CN 106193306B CN 201610678210 A CN201610678210 A CN 201610678210A CN 106193306 B CN106193306 B CN 106193306B
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- lower boom
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/02—Roofs; Roof construction with regard to insulation with plane sloping surfaces, e.g. saddle roofs
- E04B7/022—Roofs; Roof construction with regard to insulation with plane sloping surfaces, e.g. saddle roofs consisting of a plurality of parallel similar trusses or portal frames
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/199—Details of roofs, floors or walls supported by the framework
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1996—Tensile-integrity structures, i.e. structures comprising compression struts connected through flexible tension members, e.g. cables
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
A kind of long-span hangar fringe truss prestressed structural systems and its construction method, the structural system includes along the spaced roof system support column in three side of hangar, the plate rooftop air conditioning unit being fixed at the top of roof system support column, positioned at the open side side of roof system support column and along the spaced gate truss support column of hangar depth direction and it is fixed on the gate truss of gate truss support column top, rooftop air conditioning unit and gate truss are directly connected to, prestressing with bond steel strand wires rope is provided in the lower boom of gate truss, prestressing with bond steel strand wires rope completes pre- tensioning by anchoring end node positioned at lower boom both ends and tensioning end node respectively, inside the both ends of lower boom, two end outboard bonds sections of prestress steel twist clue are perfused with concrete.The present invention can successfully be crossed over the single span hangar of 140m spans or more using ball, tubular truss, be greatly improved the technical-economic index of structure due to the use of prestressing with bond technology.
Description
Technical field
The present invention relates to a kind of prestressed structural systems of steel truss and its construction method, especially a kind of long-span hangar
The prestress system and its construction method of fringe truss.
Background technology
The span of existing large size expanded letter two-shipper position repair hangar is generally 140m~160m, depth be generally 80m~
100m, height then regard roof system suspension equipment the case where generally 24.5m~29.5m.Store door generally towards taxiway or
Airplane parking area, accessory occupancy can be in hangar other three face rings around arrangement according to the stream of people, logistics relation.Two-shipper position hangar span is more than
120m, and three side of hangar roof system supports, it is open on one side, therefore the hangar roof design of large span is always the weight of hangar design
Point and its difficult point.
In previous design, long-span hangar roof system generally uses three layer flat plate shaped steel grid structure, three sides in plane
Equipped with armored concrete elastic supports, the open no flooring support in one side along structural span direction, open side use by two Pin greatly across
The space box beam for spending steel truss composition supports roof system rack as edge member.Existing layout of structural system is referring to Fig. 1, greatly
Door truss is connect with rooftop air conditioning unit by web member and node, and truss element rod piece internal force is mainly axle power, so its section is selected
The steel pipe that type uses all directions drawing, presses bearing capacity all same, stock utilization highest, technical-economic index are best.But large span
Store door truss member internal force is huge, maximum up to 5000 tons, the bearing capacity limit of round steel pipe is had exceeded, so traditional
Hangar design in, gate truss section type selecting generally use the higher H-type of bearing capacity or box-type section.
The traditional design of gate truss has the following disadvantages：
1. compare round steel tube section, H-type or box-type section processing make and assembled difficulty is big, the period is long；
2. will produce larger constraint internal force in section, the prodigious part in section is caused to be used for bearing constraint internal force, material
Expect that utilization rate is low；
3. section panel thickness generally can be more than 60mm, steel plate is due to rolling, and strength retrogression is very big, according to strong
The small high-performance steel plate of degree decaying, other than expensive, procurement cycle is very long；
4. gate truss support column will produce huge constraint internal force, reduce under the huge counter-force effect of gate truss
Gate truss support column effectively carries the ability of external load.
Invention content
The object of the present invention is to provide a kind of long-span hangar fringe truss prestressed structural systems and its construction methods, to solve
Certainly existing gate truss makes that difficult, stock utilization is low, valence is than undesirable and reduce gate truss branch there are on-circular cross-section
The technical issues of ability of effective carrying external load of platen.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of long-span hangar fringe truss prestressed structural systems, including along the spaced roof system bearing in three side of hangar
Column, the plate rooftop air conditioning unit being fixed at the top of roof system support column are located at the open side side of roof system support column and along machine
The spaced gate truss support column of library depth direction and the gate truss for being fixed on gate truss support column top, it is described
Gate truss is irregular section space truss, and the top boom number of gate truss is more than lower boom number, the gate truss
Outermost truss structure including rooftop air conditioning unit is provided with prestressing with bond steel strand wires rope, institute in the lower boom of the gate truss
It states prestressing with bond steel strand wires rope and pre- tensioning is completed by anchoring end node positioned at lower boom both ends and tensioning end node respectively,
Inside the both ends of the lower boom, two end outboard bonds sections of prestress steel twist clue be perfused with concrete.
The gate truss connects the irregular section formed by web member by three Pin plane girders with corresponding node
Space truss, the three Pin plane girders are respectively two Pin prestressing force bilayer truss and a Pin truss frame for connecting, three Pin plane girders
Top boom absolute altitude it is identical, the prestressing force bilayer truss lower boom of prestressing force bilayer truss is sat respectively to corresponding two rows of gates truss
The top of support column, the prestressing force bilayer truss lower boom is interior to be equipped with prestressing with bond steel strand wires rope.
The gate truss is identical as the absolute altitude of rooftop air conditioning unit, and the truss frame for connecting includes the outermost Pin of rooftop air conditioning unit
Truss, outermost truss structure top boom is identical as prestressing force bilayer pricncipal rafter absolute altitude, outermost truss structure lower boom and prestressing force
Chord member absolute altitude is identical in the double-deck truss.
The absolute altitude of the gate truss be higher than rooftop air conditioning unit absolute altitude, the truss frame for connecting include rooftop air conditioning unit most
The compression shunting top boom added on the upside of outer truss structure and the outermost truss structure top boom, the compression shunt top boom and answer in advance
The absolute altitude of power bilayer pricncipal rafter is equal, which shunts top boom and connect with outermost truss structure top boom by perpendicular web member,
Compression shunting top boom is connect by horizontal web member with prestressing force bilayer pricncipal rafter.
A kind of construction method of long-span hangar fringe truss prestressed structural systems, construction procedure are as follows：
Step 1, according to the design requirement of long-span hangar in the rod piece and node of factory process rooftop air conditioning unit, processing
Gate truss and be segmented be transported to scene；
The two is connected as one by step 2, assembled rooftop air conditioning unit and gate truss；
Step 3 lifts the two after promoting designed elevation together to assembled good rooftop air conditioning unit and gate truss
On the roof system support column and gate truss support column poured；
Step 4 is worn prestressing with bond steel strand wires rope by design requirement in the lower boom of gate truss；
Anchoring end node and tensioning end node is respectively set at the both ends of lower boom in step 5,
Step 6 carries out repeatedly stretching, until being stretched to design after anchorage installation to prestressing with bond steel strand wires
Pretension；
Step 7 carries out ultra stretching to make up loss of prestress to the prestressing with bond steel strand wires after step 6；
After ultra stretching, microdilatancy is perfused in the adhesive section of the both ends setting of the lower boom of gate truss in step 8
Concrete.
In the step 4, it is cased with outside during the lower boom of gate truss is passed through outside prestressing with bond steel strand wires rope interior
Bushing pipe, the diameter of the internal lining pipe determine according to the diameter of prestressing with bond steel strand wires rope, the prestressing with bond steel strand wires rope
Both ends exceed internal lining pipe, and the outside beyond part is that slightly expanded concrete is perfused in adhesive section in step 8.
In the step 5, the tensioning end node includes prestressing force bilayer truss lower boom, internal lining pipe, is located at node steel
The outside of ball and tensioning end plate, the anchorage on the outside of tensioning end plate for being fixed on prestressing force bilayer truss lower edge rod end surface
And it is sleeved on the protective cover on the outside of anchorage, on the prestressing force bilayer truss lower boom between tensioning end plate and node steel ball
It is provided with grout hole.
In the step 5, the anchoring end node includes prestressing force bilayer truss lower boom, internal lining pipe, is located at node steel
The outside of ball and the anchoring end plate for being fixed on prestressing force bilayer truss lower edge rod end surface are located at anchoring end plate and node steel ball
Between prestressing force bilayer truss lower boom on be provided with grout hole.
It is provided with air hole on the prestressing force bilayer truss lower boom of the adhesive section.
When the prestressing force bilayer truss lower boom is by the node steel ball of intermediate node, it is located under prestressing force bilayer truss
The inner wall of chord member, the internal lining pipe within the scope of node steel ball outer wall between be cased at least twice annular partition.
Compared with prior art the invention has the characteristics that and advantageous effect：
Long-span hangar fringe truss prestressed structural systems in the present invention, gate truss and rooftop air conditioning unit no longer pass through
Web member is connected with corresponding node, but by the open side gate Truss Design of hangar roof system at irregular box section, gate
Truss includes the outermost truss structure of rooftop air conditioning unit, and the compression boom number for setting of winding up at this time is more than the number by tension chord, this
When the compression internal force that winds up disperseed, section type selecting can also meet stress needs using round steel pipe.Lower edge two rows are by tension chord
In elongated high-strength prestressing with bond steel strand wires are then set, and anchored end and stretching end are set at gate truss both ends, by right
Prestress wire carries out effective pre- tensioning, in addition to establishing pre-stressed state in gate truss and improving its stress performance, body
Interior prestress wire can also form the common stress in compound section with lower edge round steel pipe, utilize the tensile capacity of high strength steel strand
The deficiency for making up round steel pipe bearing capacity makes store door truss top-bottom chord that round steel tube section may be used.
The present invention improves the vertical support rigidity of gate truss first compared with traditional method, improves the roof system of its bearing
The stress performance of steel construction；Next effectively reduces the amount of deflection on the open side in roof system gate, meets the suspension equipment operation of roof system setting
Demand；The constraint internal force that gate opening edge truss support column can be effectively reduced again is effectively improved it and resists the energy of external load
Power；Simultaneously because the use of prestressing with bond technology, the single span machine of 140m spans or more can be successfully crossed over using ball, tubular truss
Library greatly improves the technical-economic index of structure.
Description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is existing structure system layout drawing in background technology.
Fig. 2 is the side structure schematic view of embodiment one.
Fig. 3 is the side structure schematic view of embodiment two.
Fig. 4 is the planar structure schematic diagram of embodiment two.
Fig. 5 is A-A cross-sectional views in Fig. 2.
Fig. 6 is B-B cross-sectional views in Fig. 2.
Fig. 7 is the structural schematic diagram of tensioning end node.
Fig. 8 is the structural schematic diagram for anchoring end node.
Fig. 9 is the structural schematic diagram of intermediate node.
Figure 10 is the cross-sectional view of prestressing force bilayer truss lower boom.
Figure 11 is traditional store door truss calculation diagram.
Figure 12 is traditional store door truss bending moment diagram.
Figure 13 is traditional store door truss amount of deflection figure.
Figure 14 is bending moment diagram of traditional store door truss support column under gravity laod operating mode.
Figure 15 is structure of the invention calculation diagram.
Figure 16 is truss bending moment diagram in gate of the present invention.
Figure 17 is store structure amount of deflection figure of the present invention.
Figure 18 is bending moment diagram of the truss support column in gate of the present invention under gravity laod operating mode.
Reference numeral：1- roof systems support column, 2- rooftop air conditioning units, the gates 3- truss support column, the gates 4- truss,
Chord member, 5.3- are pre- in 5- prestressing force bilayers truss, 5.1- prestressing force bilayers pricncipal rafter, 5.2- prestressing force bilayer truss
Stress bilayer truss lower boom, 6- annular partitions, the outermost truss structures of 7-, the outermost truss structure top booms of 7.1-, 7.2- are outermost
Truss structure lower boom, 8- be pressurized shunting top boom, 9- erect web member, the horizontal web members of 10-, 11- prestressing with bond steel strand wires rope,
12- internal lining pipes, 13- tensioning end plate, 14- anchorages, 15- grout holes, 16- nodes steel ball, 17- anchoring end plate,
18- air holes, 19- protective covers.
Specific implementation mode
Embodiment one is shown in Figure 2, and rooftop air conditioning unit 2 is designed as grid structure, and this long-span hangar fringe truss is pre-
Stress structure system includes along the spaced roof system support column 1 in three side of hangar, the tablet being fixed at the top of roof system support column 1
The grid structure of type is located at 1 open side side of roof system support column and along the spaced gate truss branch of hangar depth direction
Platen 3 and the gate truss 4 for being fixed on 3 top of gate truss support column, the gate truss 4 are irregular section space purlin
The top boom number of frame, gate truss 4 is more than lower boom number, and the gate truss 4 includes the outermost truss structure of grid structure
7, i.e., outermost truss structure 7 is provided with body in the lower boom of the gate truss as a wherein truss structure stress for gate truss
Interior prestress steel twist clue 11, the prestressing with bond steel strand wires rope respectively by anchoring end node positioned at lower boom both ends and
Tensioning end node completes pre- tensioning, inside the both ends of the lower boom, two end outboard bonds of prestress steel twist clue 11
Section is perfused with concrete.
The gate truss 4 connects the irregular section formed by web member by three Pin plane girders with corresponding node
Space truss, the three Pin plane girders are respectively two Pin prestressing force bilayers truss 5 and a Pin truss frame for connecting, three Pin plane girders
Top boom absolute altitude it is identical, the prestressing force bilayer truss lower boom 5.3 of prestressing force bilayer truss is sat respectively to corresponding two rows of gates
The top of truss support column 3, the prestressing force bilayer truss lower boom 5.3 is interior to be equipped with prestressing with bond steel strand wires rope 11.
The gate truss 4 is identical as the absolute altitude of roof system rack, and the truss frame for connecting includes the outermost purlins Pin of roof system rack
Frame 7, the outermost truss structure top boom 7.1 of outermost truss structure 7 and the prestressing force bilayer pricncipal rafter 5.1 of prestressing force bilayer truss
Absolute altitude is identical, the outermost truss structure lower boom 7.2 of outermost truss structure and string in the prestressing force bilayer truss of prestressing force bilayer truss
5.2 absolute altitude of bar is identical.
Embodiment two is shown in Figure 3, what is different from the first embodiment is that the absolute altitude of the gate truss 4 is higher than roof system net
The absolute altitude of frame, the truss frame for connecting include that the outermost truss structure 7 of roof system rack and the outermost truss structure of the outermost truss structure 7 wind up
The compression shunting top boom 8 that 7.1 upside of bar is added, the prestressing force of the compression shunting top boom 8 and prestressing force bilayer truss are double
The absolute altitude of layer pricncipal rafter 5.1 is equal, which shunts top boom 8 and connected with outermost truss structure top boom 7.1 by perpendicular web member 9
It connects, compression shunting top boom 8 is connect by horizontal web member 10 with prestressing force bilayer pricncipal rafter 5.1.
Referring to shown in Fig. 4-6, the width of hangar is s, and the depth of roof system rack is D1, is highly H2, gate truss 4 into
Depth is D2, is highly H1.
The construction method of this long-span hangar fringe truss prestressed structural systems, construction procedure are as follows：
Step 1, according to the design requirement of long-span hangar in the rod piece and node of factory process roof system rack, processing is greatly
Door truss 4 and be segmented be transported to scene.
The two is connected as one by step 2, assembled roof system rack and gate truss 4.
The two is lifted on by step 3 after promoting designed elevation together to assembled good roof system rack and gate truss 4
On the roof system support column 1 and gate truss support column 3 poured.
Step 4 is worn prestressing with bond steel strand wires rope by design requirement in the lower boom of gate truss；
Wherein in step 4, prestressing with bond steel strand wires rope is worn in the lower boom of gate truss by design requirement can be
While assembled gate truss, it can also be promoted after designed elevation in working at height.It is worn outside prestressing with bond steel strand wires rope 11
It is cased with internal lining pipe 12 outside during crossing the lower boom of gate truss, the diameter of the internal lining pipe is according to prestressing with bond steel strand wires rope
Diameter determine that the both ends of the prestressing with bond steel strand wires rope 11 exceed internal lining pipe 12, the outside beyond part is adhesive section
Slightly expanded concrete is perfused in step 8.Shown in Fig. 7 and Fig. 8, the length of the adhesive section is L.
Anchoring end node and tensioning end node is respectively set at the both ends of lower boom in step 5.
Shown in Figure 7, the tensioning end node includes prestressing force bilayer truss lower boom 5.3, internal lining pipe 12, is located at section
The outside of point steel ball 16 is simultaneously fixed on the tensioning end plate 13 of 5.3 end face of prestressing force bilayer truss lower boom, is located at tensioning end
The anchorage 14 in 13 outside of plate and the protective cover 19 being sleeved on the outside of anchorage, between tensioning end plate 13 and node steel ball 16
It is provided with grout hole 15 on prestressing force bilayer truss lower boom 5.3.
Shown in Figure 8, anchoring end node includes prestressing force bilayer truss lower boom 5.3, internal lining pipe 12, is located at node steel
The outside of ball 16 and the anchoring end plate 17 for being fixed on 5.3 end face of prestressing force bilayer truss lower boom are located at anchoring end plate 17
Grout hole 15 is provided on prestressing force bilayer truss lower boom 5.3 between node steel ball 16, the prestressing force of the adhesive section is double
It is provided with air hole 18 on layer truss lower boom 5.3.
Referring to shown in Fig. 9-10, when the prestressing force bilayer truss lower boom 5.3 is by the node steel ball 16 of intermediate node,
Be cased between the outer wall of internal lining pipe 12 in the inner wall of prestressing force bilayer truss lower boom 5.3,16 range of node steel ball to
Few twice annular partition 6, annular partition plays internal lining pipe 12 in the work of limit inside prestressing force bilayer truss lower boom 5.3
With.
Step 6 carries out repeatedly stretching, until being stretched to design after anchorage installation to prestressing with bond steel strand wires
Pretension.
Step 7 carries out ultra stretching to make up loss of prestress to the prestressing with bond steel strand wires after step 5.
After ultra stretching, microdilatancy is perfused in the adhesive section of the both ends setting of the lower boom of gate truss in step 8
Concrete.
Referring to Fig. 1, edge member, that is, large span steel truss of the open side setting in traditional single span store structure gate is along span
Direction is shown generally as single span simply supported beam, and calculation diagram is as shown in figure 11, can be obtained by the computational methods of structural mechanics
Its moment of flexure and amount of deflection figure, maximum value are happened at span centre, respectivelyql 2/ 8 and 5ql 4/（384EI）, such as Figure 12-13.
Due to compatibility of deformation, the horizontal thrust that gate truss generates under gravity laod operating mode can be in gate truss support
The restraining moment that column column bottom generatesM t, calculation diagram and bending moment diagram such as Figure 14.Prestress wire in gate joist body of the present invention
Rope layout drawing is as shown in figure 15, and moment of flexure and amount of deflection layout drawing are shown in that Figure 16-17, doorjamb bending moment diagram are shown in Figure 18.In Figure 11-18, respectively
A letter is respectivelyq—Gate truss equivalent uniform load；T—Pretension；l—Hangar span；h—Pillar height；EI—Gate purlin
Frame section bending stiffness；M t —Restraining moment of the gate truss support column under gravity laod operating mode；M pr —What prestressing force was cut down
Gate truss moment of flexure；M i —The moment of flexure that prestressed stretch-draw is cut down；f pr —Gate truss prestressing camber value.
Above structure analysis shows：
The first, for long-span hangar structure, usual gate truss accounts for 40% or more of entire roof structure dead weight.This hair
It is bright by applying precompression to gate truss lower edge, can effectively reduce lower edge bar cross section, mitigate dead load；
Second, gate truss lower edge carries out the antiarch value of pre- tensioning generationf pr , can effectively reduce gate truss amount of deflection 30% with
On, significantly improve the deformation performance of roof system；
Third, the pre- tensioning of gate truss lower edge progress can also effectively cut down gate truss and be generated under gravity laod effect
Huge horizontal thrust greatly carried to cut down restraining moment of 80% or more the gate support column under gravity laod operating mode
High gate truss resists the ability of external load；
4th, gate truss lower edge, which carries out pre- tensioning, can partly cut down the internal force peak value of gate truss；
In short, by the way that gate lower edge prestress wire is arranged, and effectively pre- tensioning is carried out to it, using bulb truss
The span that 140m or more can successfully be crossed over, except reducing roof system steel using amount, and shortens processing, fabrication cycle.
Claims (10)
1. a kind of long-span hangar fringe truss prestressed structural systems, it is characterised in that：Including spaced along three side of hangar
Roof system support column（1）, be fixed on roof system support column（1）The plate rooftop air conditioning unit at top（2）, be located at roof system support column
（1）Open side side and along the spaced gate truss support column of hangar depth direction（3）And it is fixed on gate truss
Support column（3）The gate truss at top（4）, the gate truss（4）For irregular section space truss, gate truss（4）'s
Top boom number is more than lower boom number, the gate truss（4）Including rooftop air conditioning unit（2）Outermost truss structure（7）, described
Prestressing with bond steel strand wires rope is provided in the lower boom of gate truss（11）, the prestressing with bond steel strand wires rope passes through respectively
Anchoring end node and tensioning end node positioned at lower boom both ends complete pre- tensioning, inside the both ends of the lower boom, prestressing force
Steel strand wires rope（11）Two end outboard bonds sections be perfused with concrete.
2. long-span hangar fringe truss prestressed structural systems according to claim 1, it is characterised in that：The gate purlin
Frame（4）The irregular section space truss formed is connected with corresponding node by web member by three Pin plane girders, described three
Pin plane girders are respectively two Pin prestressing force bilayer truss（5）With a Pin truss frame for connecting, the top boom absolute altitude of three Pin plane girders
It is identical, prestressing force bilayer truss lower boom（5.3）It is respectively connected to corresponding two rows of gates truss support column（3）Top, it is described
Prestressing force bilayer truss lower boom（5.3）It is interior to be equipped with prestressing with bond steel strand wires rope（11）.
3. long-span hangar fringe truss prestressed structural systems according to claim 2, it is characterised in that：The gate purlin
Frame（4）With rooftop air conditioning unit（2）Absolute altitude it is identical, the truss frame for connecting includes the outermost truss structure of rooftop air conditioning unit（7）, outermost
Truss structure top boom（7.1）With prestressing force bilayer pricncipal rafter（5.1）Absolute altitude is identical, outermost truss structure lower boom（7.2）With
Chord member in prestressing force bilayer truss（5.2）Absolute altitude is identical.
4. long-span hangar fringe truss prestressed structural systems according to claim 2, it is characterised in that：The gate purlin
Frame（4）Absolute altitude be higher than rooftop air conditioning unit（2）Absolute altitude, the truss frame for connecting includes the outermost truss structure of rooftop air conditioning unit（7）
With outermost truss structure top boom（7.1）The compression that upside is added shunts top boom（8）, the compression shunting top boom（8）With it is pre-
Stress bilayer pricncipal rafter（5.1）Absolute altitude it is equal, the compression shunt top boom（8）By erecting web member（9）With the outermost purlins Pin
Frame top boom（7.1）Connection, the compression shunt top boom（8）Pass through horizontal web member（10）With prestressing force bilayer pricncipal rafter
（5.1）Connection.
5. the construction method of the long-span hangar fringe truss prestressed structural systems according to claim 2-4 any one,
It is characterized in that, construction procedure is as follows：
Step 1, according to the design requirement of long-span hangar in factory process rooftop air conditioning unit（2）Rod piece and node, processing is big
Door truss（4）And it is segmented and is transported to scene；
Step 2, assembled rooftop air conditioning unit（2）With gate truss（4）The two is connected as one；
Step 3, to assembled good rooftop air conditioning unit（2）With gate truss（4）After promoting designed elevation together, the two is hung
Mounted in the roof system support column poured（1）With gate truss support column（3）On；
Step 4 is worn prestressing with bond steel strand wires rope by design requirement in the lower boom of gate truss；
Anchoring end node and tensioning end node is respectively set at the both ends of lower boom in step 5,
Step 6 carries out repeatedly stretching, until being stretched to design prestretching after anchorage installation to prestressing with bond steel strand wires
Power；
Step 7 carries out ultra stretching to make up loss of prestress to the prestressing with bond steel strand wires after step 6；
After ultra stretching, microdilatancy coagulation is perfused in the adhesive section of the both ends setting of the lower boom of gate truss in step 8
Soil.
6. the construction method of long-span hangar fringe truss prestressed structural systems according to claim 5, it is characterised in that：
In the step 4, prestressing with bond steel strand wires rope（11）In being cased with outside during the outer lower boom for passing through gate truss
Bushing pipe（12）, the diameter of the internal lining pipe is according to the determination of the diameter of prestressing with bond steel strand wires rope, the prestressing with bond steel strand wires
Rope（11）Both ends exceed internal lining pipe（12）, the outside beyond part is that slightly expanded concrete is perfused in adhesive section in step 8.
7. the construction method of long-span hangar fringe truss prestressed structural systems according to claim 6, it is characterised in that：
In the step 5, tensioning end node includes prestressing force bilayer truss lower boom（5.3）, internal lining pipe（12）, be located at node steel ball
（16）Outside and be fixed on prestressing force bilayer truss lower boom（5.3）The tensioning end plate of end face（13）, be located at tensioning end
Plate（13）The anchorage in outside（14）And it is sleeved on the protective cover on the outside of anchorage（19）, it is located at tensioning end plate（13）With node steel ball
（16）Between prestressing force bilayer truss lower boom（5.3）On be provided with grout hole（15）.
8. the construction method of long-span hangar fringe truss prestressed structural systems according to claim 6, it is characterised in that：
In the step 5, anchoring end node includes prestressing force bilayer truss lower boom（5.3）, internal lining pipe（12）, be located at node steel ball
（16）Outside and be fixed on prestressing force bilayer truss lower boom（5.3）The anchoring end plate of end face（17）, it is located at anchoring end
Plate（17）With node steel ball（16）Between prestressing force bilayer truss lower boom（5.3）On be provided with grout hole（15）.
9. the construction method of long-span hangar fringe truss prestressed structural systems according to claim 7 or 8, feature exist
In：The prestressing force bilayer truss lower boom of the adhesive section（5.3）On be provided with air hole（18）.
10. the construction method of long-span hangar fringe truss prestressed structural systems according to claim 7 or 8, feature
It is：The prestressing force bilayer truss lower boom（5.3）Pass through the node steel ball of intermediate node（16）When, it is double-deck to be located at prestressing force
Truss lower boom（5.3）Inner wall, node steel ball（16）Internal lining pipe in range（12）Outer wall between be cased at least bipassage ring
Shape partition board（6）.
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