CN114033049B - Construction method of large-span space structure - Google Patents
Construction method of large-span space structure Download PDFInfo
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- CN114033049B CN114033049B CN202110960567.3A CN202110960567A CN114033049B CN 114033049 B CN114033049 B CN 114033049B CN 202110960567 A CN202110960567 A CN 202110960567A CN 114033049 B CN114033049 B CN 114033049B
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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
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
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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
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B1/355—Extraordinary methods of construction, e.g. lift-slab, jack-block characterised by the tilting up of whole buildings or sections thereof, e.g. walls, portal frames
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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
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B2001/3583—Extraordinary methods of construction, e.g. lift-slab, jack-block using permanent tensioning means, e.g. cables or rods, to assemble or rigidify structures (not pre- or poststressing concrete), e.g. by tying them around the structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Architecture (AREA)
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- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a construction method of a large-span space structure, which comprises the following steps: s1, placing a truss on the ground through a support frame; s2, fixing the pole feet of the inclined mast on the ground through the mounting support and the temporary fixture; s3, connecting a sling between the inclined mast top and the truss, and installing a down-stay cable between the inclined mast top and the ground; s4, determining a balance state of the inclined mast after unloading the temporary tool; determining the crown displacement and the rotation angle when the tilting mast is converted to a balanced state; s5, unloading the temporary tool; the lower guy cable, the sling, the side cable and the valley cable are matched and tensioned, the truss is at a preset tensioning position, and the mast is inclined to a design position. The construction method of the large-span space structure can finish the construction of the space structure of the unsupported steel pipe truss and the mast sling structure, steel ropes can be installed according to the design position of a structural system in the construction process, and the inclined masts and trusses in the structural system can realize corresponding posture adjustment in the tensioning process of the structural system.
Description
Technical Field
The invention relates to the technical field of building construction. And more particularly, to a construction method of a large-span spatial structure.
Background
The south line toll station of Beijing airport is located on the south side of newly built T3 airport building in Beijing city, and is the main entrance and exit of expressway to Beijing airport, and has 24 lanes. The whole building adopts a membrane structural design, and the steel, the rope and the membrane are effectively combined.
The whole building plane is curved shell, 4 masts are erected on two sides of a road, the front and the rear are side ring cable bundles, 7 slings are pulled down from the top of each mast in a crossing way, the side ring cables are pulled, 1 valley cable is arranged in the middle of the top of the film, the valley cable is connected with the side ring cables through connecting cables, and 2 down cables are arranged at the top of each mast and are connected with anchor seat nodes on the outer side. 4. The masts are symmetrically arranged, the top elevation of each mast is 35.96m, the length of each mast is about 30.359m, the weight of each mast is about 38t, and each mast is connected with the ground anchor through a stay rope. The main steel rope component consists of 165 steel ropes such as side ring ropes, lower guy ropes, slings, valley ropes, connecting ropes and the like, and the total weight is about 109t. The side ring cables are arranged in a front-back symmetrical mode, each component is divided into 18 sections, each section is divided into 2 pieces, and the side ring cables are formed by connecting 16 cable clamps in series. The endless rope is pulled and connected with 4 steel masts through 4 groups of slings, and each group of slings consists of 7 slings.
The span of the building structure is 149.6m defined by building standards, which belongs to a large-span space structure, wherein the central elevation of a side ring cable is 17.097m, the central elevation of a valley cable is 15.705m, and the projected area of a film is 3275m 2 A film development area of 3385m 2 。
The Beijing airport south line toll station belongs to a steel cable film structure system, and no construction method aiming at a space structure of a supportless steel pipe truss and a mast sling structure exists at present.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a construction method for a large-span space structure, so as to form a large-span space structure system by steel, cables and trusses.
In order to achieve the above purpose, the invention adopts the following technical scheme:
according to one aspect of the invention, there is provided a construction method of a large-span spatial structure including two inclined masts symmetrically arranged in an outer eight pattern, and a truss between the two inclined masts; a sling is arranged between the truss and the two inclined masts; the truss is configured to be suspended in a tensioned position between two inclined masts by a hoist cable;
the method comprises the following steps:
s1, arranging a truss on the ground through a support frame, wherein the truss is positioned at an installation position;
s2, fixing a pole foot of the inclined mast on the ground through a mounting support and a temporary tool, wherein the inclined mast is positioned at a mounting position, and an included angle is formed between the inclined mast and the ground;
s3, connecting a sling between the top of the inclined mast and the truss, and installing a down-stay cable between the top of the inclined mast and the ground, wherein the down-stay cable and the sling are balanced relative to the inclined mast; side ropes and valley ropes are arranged on the trusses;
s4, determining a balance state of the inclined mast after unloading the temporary tool; determining the crown displacement and the rotation angle when the tilting mast is converted to a balanced state;
s5, unloading the temporary tool for tilting the mast in the step S2; the lower guy cable, the sling, the side cable and the valley cable are matched and tensioned, the truss is stretched from the installation position in the step S1 to a preset tensioning position, and the inclined mast is stretched from the installation position in the step S2 to a design position.
In addition, the installation position of the inclined mast is the position and the posture of a pole foot of the inclined mast fixed on the ground through an installation support and a temporary tool in the initial stage of construction; the design position of the inclined mast is the position and the posture of the inclined mast relative to the ground after the space structure forms a final stable state.
Furthermore, it is preferable that the truss is positioned and oriented with respect to the ground after the space structure is formed into a final stable state.
In addition, preferably, the balanced state of the inclined mast is that all temporary tool constraints of the inclined mast are removed from the space structure, at the moment, the truss is only subjected to vertical supporting force of the supporting frame, a symmetrical self-balanced state is achieved through connection of a down cable, a sling, side cables and valley cables, at the moment, the pre-tension force of the down cable is 0, and the tension force of the sling is formed by the dead weight of the inclined mast.
In addition, in the step S5, the lower cable is actively tensioned, the sling is matched with the passive tensioning of the lower cable, and the side cable is matched with the Gu Suohui aggregation force point to be actively tensioned with the lower cable and the sling.
In addition, in the step S2, according to the design height requirement of the inclined mast, the inclined mast has a multi-section structure, and in the installation process of the inclined mast, the rod foot of the first section of rod body is fixed on the ground through the installation support and the temporary fixture; then hoisting a second section of rod body; the ends of two adjacent sections of rod bodies are fixed through temporary tooling plates; and then adjusting the coaxiality of the two sections of rod bodies and connecting the two sections of rod bodies.
Furthermore, preferably, the mounting bracket includes:
a base fixed to the ground; the top surface of the base is an inclined surface; and
the lower base is positioned on the top surface of the base;
the lower base comprises a groove which is concave inwards, and the bottom surface of the groove is a spherical surface;
the mounting support also comprises an upper base which is combined and fixed on the bottom end surface of the inclined mast;
the bottom of the upper base is positioned in the groove, and the bottom surface of the upper base is a spherical surface matched with the bottom surface of the groove.
In addition, preferably, the mounting support further comprises a constraint steel plate positioned between the base and the inclined mast pole leg.
Further, preferably, the upper base comprises a main body in a cylindrical structure, and a spherical surface matched with the bottom surface of the groove is formed on one side surface of the main body close to the groove.
Furthermore, preferably, the temporary fixture comprises a temporary support column supported between the inclined mast body and the ground; the temporary support column forms an angle with the ground of between 65 and 75 degrees, and the projection of the centre of gravity of the tilting mast onto the ground is located between the bottom end of the temporary support column and the leg of the tilting mast.
The beneficial effects of the invention are as follows:
the construction method of the large-span space structure can finish the construction of the space structure of the unsupported steel pipe truss and the mast sling structure, steel ropes can be installed according to the design position of a structural system in the construction process, and the inclined masts and trusses in the structural system can realize corresponding posture adjustment in the tensioning process of the structural system.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic overall structure of the spatial structure of the present invention.
Fig. 2a to 2f show flowcharts of the construction method provided by the present invention.
Fig. 3 shows a schematic structural view of the mounting bracket provided by the invention.
Fig. 4a to 4c are flowcharts showing step S5 in the construction method provided by the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Referring to fig. 1, 2a to 2f and 3, the present invention provides a construction method of a large span space structure including two inclined masts 1 symmetrically arranged in an outer eight pattern, and a truss 2 between the two inclined masts 1; a sling 3 is arranged between the truss 2 and the two inclined masts 1; the truss 2 is arranged to be suspended in a tensioned position between two inclined masts 1 by slings 3.
The method comprises the following steps:
s1, placing a truss 2 on the ground 10 through a support frame 21, wherein the truss 2 is positioned at an installation position; the truss 2 falls on the top of the supporting frame 21;
s2, the pole feet of the inclined mast 1 are fixed on the ground through the mounting support 4 and the temporary tool 5, the inclined mast 1 is positioned at the mounting position, and an included angle is formed between the inclined mast 1 and the ground;
s3, connecting a sling 3 between the top of the inclined mast 1 and the truss 2, and installing a down-stay cable 6 between the top of the inclined mast 1 and the ground, wherein the down-stay cable 6 and the sling 3 are balanced relative to the inclined mast 1; the truss 2 is provided with side ropes 7 and valley ropes;
s4, determining a balance state of the inclined mast 1 after the temporary tooling 5 is unloaded; determining the crown displacement and the rotation angle when the tilting mast 1 is switched to the equilibrium state;
s5, unloading the temporary fixture 5 of the inclined mast 1 in the step S2; the lower guy rope 6, the sling 2, the side ropes 7 and the valley ropes are matched and tensioned, the truss 2 is stretched to a preset tensioning position from the installation position in the step S1, and the inclined mast 1 is inclined to a design position from the installation position in the step S2. And finally, dismantling the tool rope 8 and the support frame 21. Wherein, the lower guy cable 6 is actively tensioned, the sling 2 is matched with the passive tensioning of the lower guy cable, and the side cable 7 and the valley cable gathering stress point are matched with the lower guy cable 6 and the sling 2 for active tensioning.
In a specific embodiment, the inclined mast structure is a fusiform steel pipe concrete lattice column, the inclined mast is inclined outwards by 10.9 degrees, the height of the inclined mast is 46.848m, the total length of the inclined mast is 47.23m, the chord member specification of the inclined mast structure is 600×40, C40 self-compacting concrete is poured into the steel pipe, the straight web member specification is 325×8, the inclined web member specification is 219×10, all the steel pipes of the mast structure are seamless steel pipes, the web member materials are Q355B, and the main chord member materials of 600×40 are Q390GJ-C.
The total weight of the inclined mast is 120t (without column foot nodes), the total weight of the stay cable 28t and the sling is 14.4t, one end of the sling is arranged at the top of the inclined mast, the other end of the sling is arranged at the end of the truss, and the weight of the sling on the inclined mast is calculated according to 80 percent, and the total weight is 159.5t.
In a specific embodiment, the whole building plane of the space structure is curved shell, two inclined masts are located at two sides of the truss, and the inclined masts at two sides of the truss are used for suspending the whole truss structure. 16 slings are pulled down from the top of each inclined mast in a crossing way, 16 wild goose wing type steel trusses are jointly tensioned and suspended between the inclined masts through slings and side ropes, valley ropes and drainage gutter are connected below the trusses, and the ETFE transparent film unit is connected between the side ropes and the trusses. The horizontal projection area of the cable membrane structure is 3500 flat meters, the longitudinal spacing of the inclined masts is 134.48 meters, and the transverse spacing of the cable anchor seats is 21.12 meters.
The steel trusses are 16 trusses in total and are arranged between the inclined masts, the trusses at the middle position are large and gradually narrow towards the two ends, and the maximum truss weight is about 24 tons, so that the plane projection of the whole charging greenhouse is a fusiform structure; from the single truss, the truss is in a goose wing shape, and the lower two ends of the middle position extend into the air.
The engineering structure is in the form of a non-support steel pipe truss and inclined mast sling structure, the engineering plane is in a fusiform shape, the engineering plane is in a central 1/4 symmetrical structure, the width of the widest point in the middle is 39.854m, and the total length of the fusiform is 130.628m; the shuttle-shaped width direction is provided with 16 steel pipe trusses, and truss pitches are 6.872m, 7.921m, 7.649m, 7.943m, 8.175m, 8.330m, 8.425m and 8.452m respectively. The truss is in a swallow-wing shape, secondary trusses and supports are not arranged among the trusses, and the lower chord cable and the side cable in the middle of the trusses are stretched to the ground anchor through the conversion node for fixing the trusses.
In the invention, the installation position of the inclined mast 1 is the position and the posture of the rod foot of the inclined mast 1 fixed on the ground through the installation support 4 and the temporary fixture 5 in the initial construction stage; the design position of the inclined mast 1 is that the position and the posture of the inclined mast 1 relative to the ground form a final stable state after the space structure is formed. And after the stretching position of the truss 2 is a space structure to form a final stable state, the truss 2 is positioned and posture relative to the ground. The balance state of the inclined mast 1 is that all temporary fixture 5 constraints of the inclined mast 1 are removed in a space structure, at the moment, the truss 2 is only subjected to vertical supporting force of the supporting frame 21, a symmetrical self-balance state is achieved through connection of the down-stay cable 6, the sling 2, the side cable 7 and the valley cable, at the moment, the pretension of the down-stay cable 6 is 0, and the tension of the sling 2 is formed by the self weight of the inclined mast 1.
Compared with the existing steel, cable and film structure system, the space structure provided by the invention is composed of the inclined mast, the truss and the steel cable, the structure system is novel, the cable system is stressed in a complex manner, the structure system is very different from the prior art in construction state and design and use state, and the change of cable force and the displacement change of each component part in the installation process are required to be analyzed, so that the inclined mast, the truss and the steel cable all reach the design position. The construction method provided by the invention solves the problem that the steel cable in the structural system cannot be installed according to the design position by controlling the attitude offset of the inclined mast in the construction process. And the displacement problem of the structure system in the tensioning process of the structure system is solved by determining the position of the space structure before tensioning (namely the balance state of the inclined mast after the temporary tooling is unloaded in the step S4) and the position of the inclined mast from the installation position to the design position in the step S2 after the inclined mast, the suspension cable, the side cable and the valley cable are matched for tensioning.
In one embodiment, in the step S2, according to the design height requirement of the inclined mast, when the height of the inclined mast reaches 46 meters as described above, the inclined mast may be designed into a multi-section structure for facilitating installation of the inclined mast, in this case, during installation of the inclined mast, the leg of the first section of rod body is first fixed to the ground through the mounting support and the temporary fixture; then hoisting a second section of rod body; the ends of two adjacent sections of rod bodies are fixed through temporary tooling plates; and then adjusting the coaxiality of the two sections of rod bodies and connecting the two sections of rod bodies.
In one embodiment, in combination with the structure shown in fig. 3, the mounting support 4 of the present invention includes: a base 41 fixed to the ground, and a lower base 42 located on the top surface of the base 41. The top surface 411 of the base 41 is a bevel which is inclined towards the outside of the tilting mast 1, i.e. away from the truss. The lower base 42 includes a recess 421 recessed inward, and the bottom surface of the recess 421 is a spherical surface. The mounting support seat 4 also comprises an upper base 43 which is combined and fixed on the bottom end surface of the inclined mast 1; the bottom of the upper base 43 is located in the groove 421, and the bottom surface 431 of the upper base 43 is a spherical surface that mates with the bottom surface of the groove 421.
In one embodiment, the mounting bracket 4 further comprises a restraining steel plate 44 between the base 41 and the leg of the tilting mast 1, wherein the restraining steel plate 44 is used for limiting the radial displacement between the base 41 and the leg of the tilting mast 1. Further, it is preferable that the upper base 43 includes a main body having a cylindrical structure, and a side surface of the main body adjacent to the recess forms a spherical surface which is engaged with a bottom surface of the recess.
In one embodiment, the temporary tooling 5 includes a temporary support post 51 supported between the tilt mast body and the ground. The lower the support ground angle of the temporary support column, the higher the support strength of the temporary support column required, and the higher the requirement for the support strength of the temporary support column itself. The larger the temporary support column support ground angle, the longer the length of temporary support column required, wasting material. Therefore, preferably, the angle formed by the temporary support column and the ground is 65-75 degrees, the projection of the gravity center of the inclined mast on the ground is positioned between the bottom end of the temporary support column and the rod foot of the inclined mast, and the temporary support column and the inclined mast are mutually matched and stressed reasonably, so that the economy is good.
As shown in connection with fig. 4a to 4c, in step S5 described above, when unloading the mounting support 4 of the tilting mast 1 and the temporary fixture 5, the following steps are included:
s51, mounting a tooling rope 8 with the opposite inclination direction to the inclined mast on the top of the inclined mast 1;
s52, respectively installing a jack 9 on two sides of the temporary support column 51 of the inclined mast 1; the jack 9 is tightly jacked, and the tooling rope 8 is tightly tensioned but the pretension force is 0;
s53, cutting the constraint steel plate 44 so that the constraint steel plate 44 is separated from the base 41 of the mounting support 4; cutting off the temporary support column 51 in the range of the jack 9, wherein the clearance between two adjacent sections of support columns after cutting off is smaller than the travel distance of the jack 9;
s54, synchronously shortening the strokes of the two jacks 9, reducing the gap between two adjacent sections of support columns after cutting, gradually tightening the tool rope 8, enabling the top of the inclined mast 1 to displace, enabling the column shaft of the inclined mast 1 to rotate around the base, and recording the posture of the inclined mast; the tool rope 8 is tightened.
Step S54 is repeated until the jack 9 is not stressed any more, the temporary support column 51 and the jack 9 are unloaded, and the column body of the inclined mast is stably and completely borne by the tool rope 8; by winding and unwinding the length of the tool rope 8, the tilt mast is adjusted to a limited extent to the design position and the constraint steel plate 44 is removed.
The invention relates to a tool cable for a tilting mast top, which is characterized in that a tool cable for the tilting mast top is loosened and tensioned, so that the tilting mast body rotates around a mounting support base, the tool cable always has a certain amount of looseness when initial pretension is set, at the moment, when all the mounting supports and temporary tools of the tilting mast body are removed, the tilting mast body has a sudden displacement change, so that the tool cable is completely stressed, the abrupt change is caused by the looseness of the tool cable.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (9)
1. The construction method of the large-span space structure is characterized in that the space structure comprises two inclined masts which are symmetrically arranged in an outer eight mode and a truss which is positioned between the two inclined masts; a sling is arranged between the truss and the two inclined masts; the truss can be suspended at a tensioning position between the two inclined masts through slings;
the method comprises the following steps:
s1, arranging a truss on the ground through a support frame, wherein the truss is positioned at an installation position;
s2, fixing the inclined mast on the ground through a mounting support and a temporary tool, wherein the inclined mast is positioned at a mounting position, and an included angle is formed between the inclined mast and the ground; the mounting support comprises a base fixed on the ground; the mounting support also comprises a constraint steel plate positioned between the base and the inclined mast leg; the temporary tool comprises a temporary support column supported between the inclined mast body and the ground;
s3, connecting a sling between the top of the inclined mast and the truss, and installing a down-stay cable between the top of the inclined mast and the ground, wherein the down-stay cable and the sling are balanced relative to the inclined mast; side ropes and valley ropes are arranged on the trusses;
s4, determining a balance state of the inclined mast after unloading the temporary tool; determining the crown displacement and the rotation angle when the tilting mast is converted to a balanced state;
s5, unloading the temporary tool for tilting the mast in the step S2; the lower guy cable, the sling, the side cable and the valley cable are matched and tensioned, the truss is stretched from the installation position in the step S1 to a preset stretching position, and the inclined mast is stretched from the installation position in the step S2 to a design position;
step S5 includes the steps of:
s51, mounting a tooling rope with the opposite inclination direction to the inclined mast on the top of the inclined mast;
s52, respectively installing a jack on two sides of the temporary support column of the inclined mast; jack is tightly pressed, and the tool rope is tightly tightened but the pretension force is 0;
s53, cutting the constraint steel plate to separate the constraint steel plate from the base of the mounting support; cutting off temporary support columns in the range of the jack, wherein the clearance between two adjacent sections of temporary support columns after cutting off is smaller than the stroke distance of the jack;
s54, synchronously shortening the strokes of the two jacks, reducing the gap between two adjacent sections of temporary support columns after cutting, gradually tightening the tool rope, enabling the top of the inclined mast to displace, enabling the column shaft of the inclined mast to rotate around the base, and recording the posture of the inclined mast; tightening the tool rope;
repeating the step S54 until the jack is not stressed any more, unloading the temporary support column and the jack, and enabling the column body of the inclined mast to be stably and completely borne by the tool rope; and (3) the length of the tool rope is retracted, the inclined mast is adjusted to reach the design position to a limited extent, and the constraint steel plate is removed.
2. The construction method according to claim 1, wherein the installation position of the tilt mast is a position and a posture of the tilt mast fixed to the ground through the installation support and the temporary fixture at the initial stage of construction; and after the design position of the inclined mast forms a final stable state for the space structure, the position and the posture of the inclined mast relative to the ground.
3. The method of claim 1, wherein the truss is positioned and oriented relative to the ground after the truss has been tensioned to a final steady state for the space structure.
4. The construction method according to claim 1, wherein the balance state of the tilt mast is that all temporary fixture constraints of the tilt mast are removed from the space structure, the truss is only supported by the vertical supporting force of the supporting frame, a symmetrical self-balance state is achieved through connection of the lower guy cable, the sling cable, the side cable and the valley cable, the pretension of the lower guy cable is 0, and the sling cable pulling force is formed by the self weight of the tilt mast.
5. The construction method according to claim 1, wherein in the step S5, the lower cable is actively tensioned, the sling is passively tensioned in cooperation with the lower cable, and the side cable is actively tensioned in cooperation with the Gu Suohui convergence point and the sling.
6. The construction method according to claim 1, wherein in the step S2, according to the design height requirement of the inclined mast, the inclined mast has a multi-section structure, and in the installation process of the inclined mast, the first section of rod body is fixed on the ground through the installation support and the temporary fixture; then hoisting a second section of rod body; the ends of two adjacent sections of rod bodies are fixed through temporary tooling plates; and then adjusting the coaxiality of the two sections of rod bodies and connecting the two sections of rod bodies.
7. The method of claim 1, wherein the top surface of the base is a bevel;
the mounting support also comprises a lower base positioned on the top surface of the base;
the lower base comprises a groove which is concave inwards, and the bottom surface of the groove is a spherical surface;
the mounting support also comprises an upper base which is combined and fixed on the bottom end surface of the inclined mast;
the bottom of the upper base is positioned in the groove, and the bottom surface of the upper base is a spherical surface matched with the bottom surface of the groove.
8. The construction method according to claim 7, wherein the upper base comprises a main body having a cylindrical structure, and a side surface of the main body adjacent to the recess forms a spherical surface which is fitted to a bottom surface of the recess.
9. The method of claim 1, wherein the temporary support column forms an angle with the ground of between 65-75 degrees, and wherein the projection of the center of gravity of the tilt mast onto the ground is located between the bottom end of the temporary support column and the leg of the tilt mast.
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| KR100818863B1 (en) * | 2007-01-05 | 2008-04-02 | 이창남 | Lift and installing method of preassembled truss decks at ground level |
| CN201660966U (en) * | 2010-02-02 | 2010-12-01 | 中冶建筑研究总院有限公司 | Mast suspension cable joist tensile integral structure |
| CN102493664B (en) * | 2011-12-21 | 2014-01-08 | 东南大学 | Non-bracket cable truss construction method for lifting entire body by obliquely drawing fixed jack |
| CN103321416B (en) * | 2013-05-29 | 2015-06-24 | 浙江东南网架股份有限公司 | Construction method for prestress of cable-stayed grid structure |
| CN105625577B (en) * | 2016-02-05 | 2017-10-27 | 中国航空规划设计研究总院有限公司 | Dismountable large-span prestressed integral tension awning and its construction method |
| CN208618562U (en) * | 2018-06-27 | 2019-03-19 | 中国中元国际工程有限公司 | A kind of oblique pull-cable truss tension structure |
| CN211597069U (en) * | 2020-01-15 | 2020-09-29 | 中冶京诚工程技术有限公司 | Cable arch truss structure suitable for oversized span closed stock ground |
| CN211898949U (en) * | 2020-09-18 | 2020-11-10 | 杭州建工集团有限责任公司 | Rotatable base device of inclined mast with truss cable structure |
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2021
- 2021-08-20 CN CN202110960567.3A patent/CN114033049B/en active Active
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