Hoisting construction method of twisted large-span steel structure roof truss

Abstract

The present application relates to a twisted large-span steel structure roof truss hoisting construction method, comprising the following steps: S1: determining the three-dimensional coordinates of the steel structure roof truss component; S2: positioning the position of the steel column and the position of the embedded part in the transfer beam according to the drawing; S3: pouring construction of the transfer beam; S4: pouring construction of the steel column; S5: ground splicing of the jig frame component, and hoisting and positioning of the spliced jig frame component, the jig frame components are fixed by welding through the connecting beam; S6: after the ground splicing and welding of the first roof truss main beam are completed, hoisting is started, and the first roof truss main beam is hoisted to the jig frame; S7: connection and fixation between the first roof truss main beam and the steel column are realized through the inclined beam, and connection and fixation between the first roof truss main beam and the transfer beam embedded part are realized through the inclined beam; S8: the next roof truss main beam is hoisted and fixedly connected with the last roof truss main beam, and the inclined beam is hoisted and welded; S9: the construction in S8 is repeated in turn.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a method for hoisting and constructing a torsion-type large-span steel structure roof truss. Background Technology

[0002] Currently, there are various methods for hoisting steel structures in China. With the continuous development of science and technology, the shapes and structural forms of steel structures are becoming increasingly complex, bringing new challenges to steel structure hoisting construction. Traditionally, steel structure roof hoisting uses a crane for positioning, directly adjusting the components to the installation position based on the crane's boom length, and then positioning and installing them. However, when the steel structure is more complex, a truck crane alone cannot meet the positioning and installation requirements, making the hoisting and positioning of complex steel structure roof trusses even more difficult. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a method for hoisting and constructing a torsion-type large-span steel roof truss, so as to solve the technical problem of difficulty in positioning complex steel roof trusses during hoisting in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in the present invention's method for hoisting and constructing a torsion-type large-span steel roof truss is as follows:

[0005] The construction method for hoisting a torsion-type large-span steel roof truss includes the following steps:

[0006] S1: Use BIM technology to create a Tekla model and determine the three-dimensional coordinates of the steel structure roof components;

[0007] S2: Locate the steel column connected to the west side of the steel structure roof truss and the embedded part for pre-embedding in the roof transfer beam on the east side according to the drawings;

[0008] S3: Construct the roof steel structure transition beam with pre-embedded parts;

[0009] S4: Construct the steel column connecting one side of the steel structure roof truss;

[0010] S5: The frame components are assembled on the ground, and the assembled frame components are hoisted and positioned. The frame components are fixed together by welding with connecting beams.

[0011] S6: After the first roof truss main beam is spliced ​​and welded on the ground, start hoisting and hoist the first roof truss main beam onto the jig. Adjust the position of the first roof truss main beam relative to the jig to ensure that each positioning point of the first roof truss main beam is within the error range.

[0012] S7: the connection and fixation between the first roof truss main beam and the steel column on the west side of the steel structure roof truss is realized through the inclined beam, and the connection and fixation between the first roof truss main beam and the embedded part in the conversion beam on the east side of the steel structure roof truss is realized through the inclined beam;

[0013] S8: the next roof truss main beam is hoisted and fixedly connected with the previous roof truss main beam, and after the fixed connection, the hoisting and welding of the inclined beam are carried out;

[0014] S9: the construction in S8 is repeated in sequence until the construction of the entire steel structure roof truss is completed.

[0015] Beneficial effects: in the application, the three-dimensional coordinates of the components of the steel structure roof truss can be accurately determined through the Tekla model, thereby laying a foundation for the accurate positioning of the steel structure roof truss; the embedded parts in the steel column and the conversion beam are convenient for the fixed connection of the steel structure roof truss, and ensure that the steel structure roof truss has strong connection stability; in the application, the positioning and fixation of the first roof beam of the steel structure roof truss are conveniently realized by using the gantry, then the inclined beam is hoisted by the automobile crane, the first roof beam is fixedly connected with the conversion beam and the steel column through the inclined beams on the east and west sides, respectively, the fixation of the first roof beam is realized, and then the next roof beam and the inclined beam are fixed and installed to the south and to the north as the reference of the first roof beam, thereby not only realizing the positioning and installation of the twisted large-span steel structure roof truss in the application, but also ensuring the installation precision and stability.

[0016] Further, in S1, the node deepening and the aerial positioning of the steel structure roof truss are realized through the Tekla model, the starting installation position of the steel structure roof truss is determined, and the specific structure of the cradle is determined.

[0017] Beneficial effects: through the Tekla model, the aerial positioning of the node of the steel structure roof truss can be conveniently determined, thereby laying a foundation for the accurate installation of the twisted large-span steel structure roof truss.

[0018] In S4, the steel bars connected with the raft steel bars are bound on the outer side of the bottom of the steel column, and the concrete column is formed by pouring concrete on the outer side of the bottom of the steel column, so as to increase the connection strength between the bottom of the steel column and the raft, the anchor bolt positioning tool is made according to the size of the connection steel plate at the bottom of the steel column, after the steel bars are bound, the anchor bolts are embedded according to the positioning relationship between the steel column and the concrete column, and the anchor bolts are fixedly connected with the raft steel bars.

[0019] Beneficial effects: the bottom of the steel column is fixedly connected with the raft steel bars through the anchor bolts, thereby increasing the connection strength between the bottom of the steel column and the raft.

[0020] Further, in S4, the steel column bottom connecting steel plate is fixedly connected with the raft through the foundation bolt, and grouting material is poured and compacted between the steel column bottom and the raft; then the concrete outside the steel column is poured to realize the pouring construction of the concrete column.

[0021] Beneficial effects: The grouting material poured and compacted between the steel column bottom and the raft ensures the connecting strength between the steel column and the raft, and in addition, the concrete poured outside the steel column bottom forms the concrete column, which further strengthens the connecting strength between the steel column and the raft, so that the steel column can provide strong tensile, compressive and shear resistance for the steel structure roof truss.

[0022] In S3, the embedded part in the conversion beam is customized according to the design drawing, the embedded part includes an embedded plate, a cross-shaped shear-resistant steel column fixedly connected with the embedded plate, and a plurality of vertical steel bars fixedly connected with the lower surface of the embedded plate, the lower ends of the vertical steel bars are flush with the lower surface of the conversion beam, and the embedded part is provided with avoiding holes for the longitudinal bars extending along the north-south direction to pass through.

[0023] Beneficial effects: By providing the avoiding holes for the longitudinal bars to pass through on the embedded part, the connecting performance between the embedded part and the longitudinal bars is increased, and after the pouring of the conversion beam concrete, the embedded part and the conversion beam have good connecting performance, which facilitates the embedded part to transmit the load to the conversion beam.

[0024] Further, in S3, the reinforcement cage is placed in the conversion beam and positioned, then the embedded part is placed in the reinforcement cage and positioned, the longitudinal bars are passed from one end of the conversion beam to the other end, and the longitudinal bars pass through the reinforcement cages and the embedded parts in sequence; then the conversion beam concrete is poured.

[0025] Beneficial effects: The setting of the reinforcement cage further increases the connecting tightness between the embedded part and the conversion beam longitudinal bars, and the longitudinal bars limit the upward movement of the embedded part, which can enhance the tensile performance of the embedded part when the embedded part is subjected to upward tension.

[0026] In S5, when the cradle frame is positioned and installed, the cradle frame member is fixedly connected with the embedded steel plate embedded on the roof according to the positioning of the cradle frame member on the roof, so as to ensure the stable fixation of the cradle frame member, then the adjacent two cradle frame members are connected through the connecting beam, the connecting beam includes the inclined beam in a triangle shape with the cradle frame member and the cross beam connecting the two cradle frame members, so as to ensure the stable fixation of the cradle frame.

[0027] Beneficial effects: The stable fixation of the cradle frame is ensured, and the setting of the connecting beam increases the overall structural strength of the cradle frame.

[0028] Further, in S5, the steel column of the cradle is corresponded with the building main body concrete column up and down, if the steel column of the cradle has no corresponding building main body concrete column, the same specification counter top steel column is arranged to counter top support at the floor corresponding to the steel column of the cradle in the building main body, so as to ensure that the counter top steel column is corresponded with the steel column of the cradle up and down.

[0029] Beneficial effects: The setting of the counter top support further enhances the support performance of the cradle.

[0030] In S6, when the position of the first truss girder is adjusted relative to the cradle, the reflective tags are pasted on the four corners of the first truss girder, the total station is used to position according to the three-dimensional coordinates provided by the BIM model, and the four corners of the first truss girder are positioned one by one until the positioning of the four corners is completed.

[0031] Beneficial effects: The adjustment and positioning of the first truss girder are facilitated, and the positioning accuracy of the first truss girder is ensured, so that the first truss girder is used as the positioning reference of other truss girders.

[0032] In S7, the gravity center position is confirmed according to the length of the inclined beam before the installation of the inclined beam, the hoisting point position of the inclined beam is determined, the hoisting inclination angle of the inclined beam is basically consistent with the inclination angle in the design drawing during the installation of the inclined beam, then the inclined beam is fine positioned through the chain block, the two inclined beams on the east side and the two inclined beams on the west side of the first truss girder are welded after the positioning is completed, the crane is unloaded step by step, the deformation of the inclined beam is observed, and after the crane is completely unloaded, the hook is removed from the inclined beam after one hour of static state, so as to ensure that the truss is stable.

[0033] Beneficial effects: The hoisting of the inclined beam is facilitated, and the safety of the installation process of the inclined beam is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the construction flow chart of the twisted large-span steel structure truss hoisting construction method in the application;

[0035] Figure 2 is the structure schematic view of the twisted large-span steel structure truss in the application;

[0036] Figure 3 is Figure 2 the side view of the twisted large-span steel structure truss in the application;

[0037] Figure 4 is Figure 1 the structure schematic view of the main beam body of the twisted large-span steel structure truss in the application;

[0038] Figure 5 is Figure 1 the structure schematic view of one truss body of the twisted large-span steel structure truss in the application;

[0039] Figure 6 is Figure 1 is a structural schematic view of another frame body of the twisted large-span steel structure roof truss in the application;

[0040] Figure 7 is a side view of the transfer beam of the twisted large-span steel structure roof truss in the application;

[0041] Figure 8 is a front view of the transfer beam of the twisted large-span steel structure roof truss in the application;

[0042] Figure 9 is a top view of the embedded part in the transfer beam;

[0043] Figure 10 is a left view of the embedded part in the transfer beam;

[0044] Figure 11 is a structural schematic view of the steel column;

[0045] Figure 12 is Figure 11 is an A-A sectional view of the steel column in the application;

[0046] Figure 13 is Figure 11 is a B-B sectional view of the steel column in the application;

[0047] Figure 14 is Figure 11 is a C-C sectional view of the steel column in the application;

[0048] Figure 15 is a jig structure schematic view of the hoisting construction method of the twisted large-span steel structure roof truss in the application.

[0049] The drawings show that: 1 is a main beam of the roof truss; 2 is a first inclined beam; 3 is a second inclined beam; 4 is a steel column; 5 is a transfer beam; 6 is a building roof; 7 is a longitudinal reinforcement; 8 is an embedded plate; 9 is a cross-shaped shear-resistant steel column; 10 is a large-head dowel; 11 is a vertical steel bar; 12 is a supporting cushion block; 13 is a steel reinforcement cage; 14 is a hinged support; 15 is an avoiding hole; 16 is a first steel plate; 17 is a second steel plate; 18 is a third steel plate; 19 is a fourth steel plate; 20 is a positioning hole; 21 is an exhaust hole; 22 is a raft; 23 is a foundation bolt; 24 is a connecting steel plate; 26 is a bundled steel bar; 27 is a shear-resistant dowel; 28 is a ventilation hole; 29 is a grouting hole; 30 is a through hole; 31 is a jig; 32 is a jig component; 33 is a connecting beam; 34 is a concrete column; 35 is an inverted steel column; and 36 is a main beam body. DETAILED DESCRIPTION

[0050] The hoisting construction method of the twisted large-span steel structure roof truss in the application will be described in further detail below in combination with the drawings and specific embodiments:

[0051] The twisted large-span steel structure roof truss comprises a plurality of truss bodies, the truss bodies are connected through the transversely arranged connecting columns, the truss body comprises a roof truss main beam 1 suspended relative to the top of the building, and a first inclined beam 2 and a second inclined beam 3 fixedly connected to the two sides of the roof truss main beam 1, the first inclined beam 2 is located on the west side of the steel structure roof truss, and the second inclined beam 3 is located on the east side of the steel structure roof truss, wherein the lower end of the first inclined beam 2 is connected to the raft 22 through a steel column 4, and the lower end of the second inclined beam 3 is connected to a pre-embedded part embedded in a conversion beam 5 through a hinged support 14, so that part of the load of the roof truss is transmitted to the pre-embedded part through the hinged support 14, and then transmitted to the conversion beam 5 through the pre-embedded part, so that the building main body bears part of the load of the roof truss.

[0052] The roof truss is twisted as a whole because the connecting points of the roof truss on one side of the ground connected through the steel column 4 are not on the same straight line, and the connecting points on the other side of the roof truss connected with the conversion beam 5 are all on the conversion beam 5. In this embodiment, the east side of the roof truss main beam 1 is connected with the pre-embedded part of the conversion beam 5 through the support point of the second inclined beam 3, and the west side of the roof truss main beam 1 is connected with the steel column 4 through the first inclined beam 2. The first inclined beam 2 and the second inclined beam 3 are located on the two sides of the roof truss main beam 1 and are connected with the roof truss main beam 1 through butt welding.

[0053] The roof truss main beams 1 of the plurality of truss bodies are connected to form a main beam body 36 suspended relative to the top of the building. The roof truss main beams 1 of each truss body of the steel structure roof truss form a 63.1m-high main beam body 36, the main beam body 36 has a bending angle, and the bending value is realized when the main beam body 36 is processed in sections. After the main beam body 36 is fixed, the two ends are high and the middle is low, and the horizontal direction is also an arc structure. The overall component of the steel structure roof truss is constantly twisted and changed, thereby forming a twisted steel structure roof truss.

[0054] In the construction, the following steps are specifically included: S1: A Tekla model is established by using BIM technology to determine the three-dimensional coordinates of the steel structure roof truss components.

[0055] Through the Tekla model, the node deepening and the in-air positioning of the steel structure roof truss are realized, the starting installation position of the steel structure roof truss is determined, the specific structure of the jig frame 31 is determined, the load bearing force of the jig frame 31 and the main component is calculated, the pre-embedded steel plate is arranged on the main concrete column according to the position of the jig frame 31 support column, and is used for welding and fixing with the jig frame 31 support column.

[0056] S2: The positions of the steel columns 4 connected on the west side of the steel structure roof truss and the pre-embedded parts embedded in the roof conversion beam 5 connected on the east side are positioned according to the drawings, the concrete pouring of the steel columns 4 and the conversion beam 5 is completed, and then the positioning of the space steel structure roof truss body is positioned according to the BIM model, and the in-air welding is completed.

[0057] S3: Pouring construction of the roof steel structure transfer beam 5 with pre-embedded pre-embedded parts.

[0058] According to the design drawings, the pre-embedded parts in the transfer beam 5 are customized, the pre-embedded parts include a pre-embedded plate 8, a cross-shaped shear steel column 9 fixedly connected with the pre-embedded plate 8, and a plurality of vertical steel bars 11 fixedly connected with the lower surface of the pre-embedded plate 8, the lower end of the vertical steel bars 11 is flush with the lower surface of the transfer beam 5, and an avoidance hole 15 is formed on the pre-embedded part for the longitudinal reinforcement 7 extending along the north-south direction to pass through.

[0059] The steel reinforcement cage 13 is placed in the transfer beam 5 and positioned, then the pre-embedded parts are placed in the steel reinforcement cage 13 and positioned, the longitudinal reinforcement 7 is passed from one end of the transfer beam 5 to the other end, and the longitudinal reinforcement 7 is sequentially passed through each steel reinforcement cage 13 and pre-embedded part; then the transfer beam 5 concrete is poured.

[0060] Specifically, the extension direction of the transfer beam 5 is defined as the left-right direction, the upper surface of the transfer beam 5 is higher than the height of the building roof 6, that is, in the up-down direction, the middle and lower part of the transfer beam 5 is located below the building roof 6, and the upper part of the transfer beam 5 is located above the building roof 6, that is, in the up-down direction, the upper surface of the transfer beam 5 protrudes from the building roof 6.

[0061] A plurality of pre-embedded parts are arranged at intervals in the extension direction of the transfer beam 5, the number of pre-embedded parts is the same as the number of inclined beams on one side of the roof truss, and the pre-embedded parts are arranged one by one corresponding to the inclined beams.

[0062] The pre-embedded part includes a horizontally arranged pre-embedded plate 8, a cross-shaped shear steel column 9 fixedly connected with the pre-embedded plate 8, and a plurality of vertical steel bars 11 fixedly connected with the lower surface of the pre-embedded plate 8, the lower end surface of the vertical steel bars 11 is flush with the lower surface of the transfer beam 5. In this embodiment, the pre-embedded plate 8 is square, the thickness is 60mm, the size of the pre-embedded plate 8 is 1800*2000mm, and the pre-embedded plate 8 is flush with the upper surface of the transfer beam 5 to be connected with the hinged support 14, thereby facilitating the connection with the inclined beam on one side of the roof truss through the hinged support 14. The vertical steel bars 11 are arranged around the cross-shaped shear steel column 9, the length of the vertical steel bars 11 in the up-down direction is greater than the length of the cross-shaped shear steel column 9 in the up-down direction, that is, the lower end of the cross-shaped shear steel column 9 is suspended relative to the lower surface of the transfer beam 5. In this embodiment, the vertical steel bars 11 are three-level steel bars with a diameter of 32mm.

[0063] The cross-shaped shear-resistant steel column 9 includes a first steel plate 16 and a second steel plate 17 arranged in a cross shape below the embedded plate 8, the intersection of the first steel plate 16 and the second steel plate 17 coincides with the center of the embedded plate 8, and the upper ends of the first steel plate 16 and the second steel plate 17 are welded to the embedded plate 8. The first steel plate 16 is arranged to extend in the left-right direction, the second steel plate 17 is arranged to extend in the front-rear direction, the left and right ends of the first steel plate 16 are respectively fixed with a third steel plate 18 arranged to extend in the front-rear direction, and the front and rear ends of the second steel plate 17 are respectively fixed with a fourth steel plate 19 arranged to extend in the left-right direction.

[0064] The first steel plate 16 in the cross-shaped shear-resistant steel column 9 is parallel to the two fourth steel plates 19, and the second steel plate 17 is parallel to the two third steel plates 18, so that the embedded part can bear a large shear force in the front-rear direction under the joint action of the first steel plate 16 and the fourth steel plate 19, and can bear a large shear force in the left-right direction under the joint action of the second steel plate 17 and the third steel plate 18.

[0065] The longitudinal reinforcement 7 is arranged to extend in the left-right direction in the transfer beam 5. In this embodiment, the transfer beam 5 is 108 m long, the length of the longitudinal reinforcement 7 is equal to the length of the transfer beam 5, the longitudinal reinforcement 7 needs to be continuous in the transfer beam 5 and cannot be bound, and the longitudinal reinforcement 7 cannot be bent. If the longitudinal reinforcement 7 needs to be connected, a sleeve is used to connect the longitudinal reinforcement 7.

[0066] When the longitudinal reinforcement 7 encounters the embedded part, in order to ensure the continuity of the longitudinal reinforcement 7, a plurality of through holes are formed in the cross-shaped shear-resistant steel column 9 for the longitudinal reinforcement 7 to pass through. Specifically, the second steel plate 17 and the two third steel plates 18 arranged in parallel with the second steel plate 17 are provided with avoiding holes 15 corresponding to the longitudinal reinforcement 7, and the longitudinal reinforcement 7 and the vertical reinforcement 11 on the embedded part are arranged in front of and behind each other when the longitudinal reinforcement 7 passes through the cross-shaped shear-resistant steel column 9.

[0067] In this embodiment, in order to increase the connectivity between the embedded part and the concrete, a plurality of large head bolts 10 are fixed to the side of the third steel plate 18 away from the first steel plate 16, and a plurality of large head bolts 10 are fixed to the side of the fourth steel plate 19 away from the second steel plate 17.

[0068] The embedded part is also provided with a steel reinforcement cage 13, and the cross-shaped shear-resistant steel column 9 and the vertical reinforcement 11 of the embedded part are located in the steel reinforcement cage 13. When the longitudinal reinforcement 7 passes through the embedded part, it first passes through the steel reinforcement cage 13 and then passes through the avoiding hole 15 of the embedded part. The arrangement of the steel reinforcement cage 13 further increases the connection performance between the embedded part and the transfer beam 5, and also increases the shear resistance of the embedded part in the transfer beam 5.

[0069] In order to increase the support stability of the embedded part at the bottom of the transfer beam 5, in the embodiment, the lower end of each vertical steel bar 11 is fixed with a support cushion block 12, which increases the support area at the bottom of the vertical steel bar 11, ensures stable support to the embedded part, and increases the support area of the embedded part. When the embedded part bears a large vertical load, the setting of the support cushion block 12 can avoid the load concentration on the vertical steel bar 11. In the embodiment, the support cushion block 12 is a small steel plate with a size of 100*100mm, which falls on the beam bottom.

[0070] In order to facilitate the welding and fixing of the vertical steel bar 11 and the embedded plate 8, in the embodiment, a steel bar positioning hole 20 is formed on the embedded plate 8, and the upper end of the vertical steel bar 11 is inserted into the steel bar positioning hole 20, so as to facilitate the welding connection between the vertical steel bar 11 and the embedded plate 8. Moreover, when the embedded plate 8 is poured with concrete, the air below the embedded plate 8 can be discharged from the exhaust hole 21, so as to ensure the compactness of the concrete pouring below the embedded plate 8 and ensure that the embedded plate 8 can fully contact with the concrete; in the embodiment, the exhaust hole 21 is formed on the embedded plate 8 and penetrates upward and downward.

[0071] The construction method of the twisted large-span steel structure roof truss transfer beam 5 structure includes the following steps:

[0072] Step one: customizing the welded embedded part according to the design drawing;

[0073] Step two: placing a plurality of steel cages 13 at the designed position of the transfer beam 5 according to the design drawing, then placing the embedded part in the steel cage 13 and welding the upper end of the steel cage 13 with the embedded part;

[0074] Step three: sequentially threading the longitudinal bars 7 from one end of the transfer beam 5, so that the longitudinal bars 7 sequentially pass through the steel cage 13 and the embedded part, and the connection points of the longitudinal bars 7 in the left-right direction are connected through sleeves;

[0075] Step four: supporting the pouring formwork of the transfer beam 5, and leaving a pouring opening at the top of the transfer beam 5;

[0076] Auxiliary pouring openings are formed on the formworks on the front and rear sides of the embedded plate 8 of the embedded part, the auxiliary pouring openings are located at the middle position of the embedded plate 8, and when pouring the concrete, the flow distance of the concrete below the embedded plate 8 is shortened.

[0077] The auxiliary pouring opening is in the shape of a horn, and after pouring is completed, the horn-shaped concrete is chiseled and repaired to be flat.

[0078] Step five: pouring the concrete of the transfer beam 5 from the pouring opening.

[0079] S4: pouring construction of the steel column 4 connected on one side of the steel structure roof truss.

[0080] The steel column 4 bottom connecting steel plate 24 is fixedly connected with the raft 22 through the foundation bolt 23, the size of the steel column 4 bottom connecting steel plate 24 is determined according to the size of the steel column 4 bottom, the size of the connecting steel plate 24 is larger than that of the steel column 4, so that the connecting flange is formed at the outer edge of the connecting steel plate 24, and the through hole 30 for the foundation bolt 23 to pass through is formed on the connecting flange. The foundation bolt 23 is embedded according to the size of the steel column 4 bottom and by using the template positioning tool of the foundation bolt 23, and the foundation bolt 23 is fixedly connected with the steel reinforcement of the raft 22 after the steel reinforcement is bound. After the steel column 4 bottom is fixedly connected with the steel reinforcement of the raft 22 through the foundation bolt 23, the grouting material is poured and compacted between the steel column 4 bottom and the raft 22 to increase the connecting strength between the steel column 4 bottom and the raft 22. In addition, the binding steel reinforcement 26 connected with the steel reinforcement of the raft 22 is bound at the outer side of the steel column 4 bottom, and then the concrete is poured outside the steel column 4 to form a concrete column, so that the concrete column is fixed outside the steel column 4 bottom. In the application, stable connections are formed between the steel column 4 and the raft 22 and between the concrete column and the raft 22, so that the steel column 4 can provide stable support and anti-inclination for the steel structure roof truss.

[0081] The fixed steel plate is arranged at the top of the steel column, the fixed steel plate is provided with the air vent hole 28 and the grouting hole 29, the grouting material is poured into the steel column from the grouting hole 29 of the fixed steel plate, and the air vent hole 28 is used to exhaust air when the grouting material is poured into the steel column. The shear bolt 27 is fixed to the outer side of the bottom of the steel column 4.

[0082] The construction of the steel column 4 includes the following construction steps:

[0083] Step one: the steel column 4 bottom connecting steel plate 24 is fixedly connected with the raft 22 through the foundation bolt 23.

[0084] Step two: after the steel column 4 bottom is fixedly connected with the steel reinforcement of the raft 22 through the foundation bolt 23, the grouting material is poured and compacted between the steel column 4 bottom and the raft 22 to increase the connecting strength between the steel column 4 bottom and the raft 22.

[0085] Step three: the steel reinforcement connected with the steel reinforcement of the raft 22 is bound outside the bottom of the column, and the formwork is erected outside the steel reinforcement.

[0086] Step four: the concrete is poured outside the steel column 4 to form a concrete column.

[0087] S5: the ground splicing of the cradle frame member 32 is performed, and the spliced cradle frame member 32 is hoisted and positioned, and the cradle frame members 32 are fixedly connected through the connecting beam 33.

[0088] When positioning and installing the cradle 31, the cradle members 32 are positioned on the roof, the bottom of the cradle members 32 is fixedly connected with the embedded steel plate embedded on the roof, the stability of the cradle members 32 is ensured, then the adjacent two cradle members 32 are connected through the connecting beams 33, the connecting beams 33 include the inclined beams in a triangular shape with the cradle members 32 and the cross beams connecting the two cradle members 32, and the stability of the cradle 31 is ensured.

[0089] When designing the cradle 31, the cradle support columns are preferably corresponded with the building main body concrete columns 34 up and down, if there is no corresponding building main body concrete column 34 for the cradle support column, a same specification counter-top steel column 35 is arranged on the floor of the building main body corresponding to the cradle support column to perform counter-top support, and the counter-top steel column 35 is ensured to be corresponded with the cradle support column up and down. Before supporting the counter-top steel column 35, the counter-top steel column 35 is positioned and laid out, and the position of the counter-top steel column 35 is ensured to be corresponded with the cradle support column up and down, so that the load on the cradle 31 is conveniently transmitted to the ground through the steel column, the building main body beam is avoided from being stressed, and the structural safety is affected; the cradle 31 is removed after the whole twisted large-span steel structure roof truss is completed. In the embodiment, the cradle support column is the cradle steel column.

[0090] S6: after the first roof truss main beam 1 is spliced and welded on the ground, the first roof truss main beam 1 is hoisted, the 700t truck crane is used for hoisting, and the first roof truss main beam 1 weighs 66t; the first roof truss main beam 1 is hoisted to the cradle 31, the position of the first roof truss main beam 1 is adjusted relative to the cradle 31, it is ensured that each positioning point of the first roof truss main beam 1 is within the error range, and the first roof truss main beam 1 is temporarily fixed with the cradle 31.

[0091] When the position of the first roof truss main beam 1 is adjusted relative to the cradle 31, the four corners of the first roof truss main beam 1 are pasted with reflective markers, the total station instrument is used, the three-dimensional coordinates provided by the BIM model are used for positioning, the four corners of the first roof truss main beam 1 are positioned one by one, since the positioning of each point will affect the movement of other points, after the positioning of the next point is completed, the previous points are rechecked and adjusted, after all the positioning is completed, the check is confirmed again, if it does not meet the requirements, the jacks are used for fine adjustment, so that all the positions are within the error range, and the four corner positioning is completed.

[0092] The roof truss main beam 1 is heavy, and the hoisting equipment demand is high, the weight is different from 40t to 98t, and the 700t truck crane, the 500t truck crane, the 400t crawler crane and the 320t crawler crane are used for hoisting.

[0093] S7: the first roof truss main beam 1 and the steel column 4 are connected and fixed through the first inclined beam 2 on the west side of the steel structure roof truss, and the first roof truss main beam 1 and the embedded part in the conversion beam 5 are connected and fixed through the second inclined beam 3 on the east side of the steel structure roof truss.

[0094] Before installing the inclined beam, the center of gravity position is confirmed according to the length of the inclined beam, the lifting point position of the inclined beam is determined, and the lifting lugs are welded to ensure that the lifting tilt angle of the inclined beam is basically consistent with the tilt angle of the inclined beam during installation in the design drawings. Then, the inclined beam is finely adjusted and positioned using a chain hoist. After positioning, the inclined beam is assembled and welded to the main beam 1 of the roof truss. During the welding of the inclined beam, the crane lifting the main beam 1 of the roof truss is under stress. After the inclined beam is installed and welded, the two inclined beams on the east side and the two inclined beams on the west side of the first main beam 1 of the roof truss are welded. The crane is then gradually unloaded, and the deformation of the inclined beam is observed until the crane is completely unloaded and the deformation of the main beam 1 of the roof truss is within the allowable range of the specifications. The crane is then completely unloaded and left to stand still for one hour to ensure the stability of the roof truss before the hook is removed from the inclined beam.

[0095] After each weld is completed, it undergoes flaw detection, followed by grinding and anti-corrosion treatment.

[0096] The inclination angles of the inclined beams are not equal, with the longest single inclined beam reaching 45m. The selection and positioning of the suspension points must be precise. The inclination angles of the inclined beams range from 17° to 81°. The maximum span of the inclined beam is 55m. The upper end of the inclined beam is butt-welded to the corresponding main beam 1 of the roof truss. Some weld points are inside the steel beam, requiring skylights to be opened on the steel beam for welding, and then the skylights are sealed.

[0097] S8: The next main beam 1 of the roof truss is hoisted and fixedly connected to the main beam 1 of the previous roof truss. After the fixed connection, the inclined beam is hoisted and welded.

[0098] When the next roof truss main beam 1 is connected to the previous roof truss main beam 1, the two points on the outer side of the next roof truss main beam 1 are located using a total station. After the positioning is completed, the joint is welded and fixed.

[0099] S9: After the main roof truss beam 1 is welded and fixed, the inclined beams are then hoisted and welded. The installation of the inclined beams repeats the process in S8. Subsequent hoisting processes repeat the above steps until the entire steel roof truss structure is completed. Aerial welding uses a customized protective suspended platform fixed to the main roof truss beam 1, allowing simultaneous welding on both sides of the main roof truss beam 1. In this embodiment, the structure of the protective suspended platform is existing technology and will not be described further.

[0100] In the application, the three-dimensional coordinates of the components of the steel structure roof truss can be accurately determined through the Tekla model, thereby laying a foundation for accurate positioning of the steel structure roof truss; the setting of the embedded parts in the steel column 4 and the transfer beam 5 facilitates the fixed connection of the steel structure roof truss, ensures that the steel structure roof truss has strong connection stability, and the setting of the embedded parts in the steel column 4 not only can bear the large vertical load of the steel structure roof truss, but also can provide strong shear resistance support for the steel structure roof truss; in the application, the positioning and fixing of the first roof beam of the steel structure roof truss are conveniently realized by using the gantry, then the first roof beam is fixedly connected with the transfer beam 5 and the steel column 4 through the inclined beams on the east and west sides by hoisting the inclined beams by the automobile crane, the fixing of the first roof beam is realized, then the fixing and installation of the next roof beam and the inclined beam are continued to the south and the north as the first roof beam as a reference, thereby not only the positioning and installation of the twisted large-span steel structure roof truss in the application are conveniently realized, but also the installation precision and stability are ensured.

Claims

1. A hoisting construction method of a twisted long-span steel structure roof truss, characterized in that, The method comprises the following steps: S1: a Tekla model is established by using a BIM technology to determine the three-dimensional coordinates of the steel structure roof truss components; S2: the positions of the steel columns connected to the west side of the steel structure roof truss and the positions of the embedded parts embedded in the roof transfer beam on the east side are positioned according to the drawings; S3: the pouring construction of the roof steel structure transfer beam with the embedded parts is performed; In S3, the embedded parts in the transfer beam are designed and customized according to the drawing, the embedded parts comprise an embedded plate, a cross-shaped shear-resistant steel column fixedly connected to the embedded plate, and a plurality of vertical steel bars fixedly connected to the lower surface of the embedded plate, the lower ends of the vertical steel bars are flush with the lower surface of the transfer beam, and the embedded parts are provided with avoiding holes for the longitudinal bars extending along the north-south direction to pass through; S4: the pouring construction of the steel columns connected to one side of the steel structure roof truss is performed; In S4, the steel bars connected to the raft steel bars are bound on the outer side of the bottom of the steel column, and the concrete column is formed by pouring the concrete on the outer side of the bottom of the steel column to increase the connecting strength between the bottom of the steel column and the raft, the anchor bolt positioning tool is made by using the formwork according to the size of the connecting plate at the bottom of the steel column, after the steel bars are bound, the anchor bolts are embedded according to the positioning relationship between the steel column and the concrete column, and the anchor bolts are connected and fixed with the raft steel bars; S5: the ground splicing of the cradle components is performed, and the spliced cradle components are hoisted and positioned, and the cradle components are welded and fixed through the connecting beams; In S5, when the cradle is positioned and installed, the cradle components are positioned on the roof, the bottom of the cradle components is fixedly connected with the embedded steel plate embedded on the roof to ensure the stability of the cradle components, then the adjacent two cradle components are connected through the connecting beams, the connecting beams comprise the inclined beams in a triangular shape with the cradle components and the cross beams connecting the two cradle components to ensure the stability of the cradle; S6: after the ground splicing and welding of the first roof truss main beam are completed, the first roof truss main beam is hoisted and positioned on the cradle, the position of the first roof truss main beam is adjusted relative to the cradle to ensure that each positioning point of the first roof truss main beam is within the error range; S7: the connection and fixation between the first roof truss main beam and the steel column on the west side of the steel structure roof truss are realized through the inclined beams, and the connection and fixation between the first roof truss main beam and the embedded parts in the transfer beam on the east side of the steel structure roof truss are realized through the inclined beams; In S7, the center of gravity is confirmed according to the length of the inclined beam before the inclined beam is installed, the hoisting point position of the inclined beam is determined, the hoisting angle of the inclined beam is basically consistent with the hoisting angle of the inclined beam in the design drawing, then the inclined beam is finely adjusted and positioned through the chain, after the positioning is completed, the splicing and welding are performed, the two inclined beams on the east side and the two inclined beams on the west side of the first roof truss main beam are welded, the crane is gradually unloaded, the deformation of the inclined beam is observed, and after the crane is completely unloaded, the hook is removed from the inclined beam after the steel structure roof truss is stable for one hour; S8: the next roof truss main beam is hoisted and fixedly connected with the previous roof truss main beam, and the hoisting and welding of the inclined beam are performed after the fixed connection; S9: the construction in S8 is repeatedly performed in sequence until the construction of the entire steel structure roof truss is completed.

2. The hoisting construction method of the twisted long-span steel structure roof truss according to claim 1, characterized in that, In S1, the node deepening and aerial positioning of the steel structure roof truss are realized by the Tekla model, the starting installation position of the steel structure roof truss is determined, and the specific structure of the cradle is determined.

3. The hoisting construction method of the twisted large-span steel structure roof truss according to claim 1, characterized in that, in S4, the steel plate at the bottom of the steel column is fixedly connected with the raft through the foundation bolt, and the grout is poured and compacted between the bottom of the steel column and the raft; then the concrete outside the steel column is poured to realize the concrete column pouring construction.

4. The hoisting construction method of the twisted long-span steel structure roof truss according to claim 1, characterized in that, In S3, the steel reinforcement cage is placed in the transfer beam and positioned, then the embedded part is placed in the steel reinforcement cage and positioned, the longitudinal reinforcement is passed through from one end to the other end of the transfer beam, and the longitudinal reinforcement is sequentially passed through each steel reinforcement cage and embedded part; then the transfer beam concrete is poured.

5. The hoisting construction method of the twisted long-span steel structure roof truss according to claim 1, characterized in that, In S5, the cradle steel column is corresponded with the building main body concrete column up and down, if the cradle steel column has no corresponding building main body concrete column, the same specification counter-jacking steel column is arranged for counter-jacking support at the floor corresponding to the cradle steel column of the building main body, so as to ensure that the counter-jacking steel column is corresponded with the cradle steel column up and down.

6. The hoisting construction method of the twisted long-span steel structure roof truss according to claim 1 or 2, characterized in that S6 In S6, when the position of the first roof truss main beam is adjusted relative to the cradle, the reflective markers are pasted at the four corners of the first roof truss main beam, the total station instrument is used to position according to the three-dimensional coordinates provided by the BIM model, and the four corners of the first roof truss main beam are positioned one by one until the positioning of the four corners is completed.

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