CN116427545B - Large-span overhanging roof with compact structure and difficult overturning and construction method thereof - Google Patents
Large-span overhanging roof with compact structure and difficult overturning and construction method thereof Download PDFInfo
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- CN116427545B CN116427545B CN202310671724.8A CN202310671724A CN116427545B CN 116427545 B CN116427545 B CN 116427545B CN 202310671724 A CN202310671724 A CN 202310671724A CN 116427545 B CN116427545 B CN 116427545B
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 239000002356 single layer Substances 0.000 claims abstract description 12
- 238000011065 in-situ storage Methods 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 16
- 238000011900 installation process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
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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
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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
-
- 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
- E04B7/08—Vaulted roofs
- E04B7/10—Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
- E04B7/105—Grid-like structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to the technical field of structures covering large-area spaces, and discloses a large-span overhanging roof with a compact structure and difficult overturning and a construction method thereof. The large-span overhanging roof is decomposed into a plurality of overhanging roof units, the overhanging roof units are then erected on the swing posts to form a structure similar to a teeterboard, one end of the teeterboard is pulled by a prestress balance rope arranged in a building to avoid sinking of the other end, and finally, no bearing is used for enclosing the wind and the stability is increased. The whole building is not easy to topple, has compact structure, and does not have extra stress members which influence the appearance of the building or cause interference. The top layer of the overhanging roof unit and the non-bearing enclosure are both single-layer steel grids, and after the overhanging roof unit is installed by the non-bearing enclosure, the top of the non-bearing enclosure is used as a position reference block for in-situ assembly, so that the requirement of complex modeling can be met, and the position is accurate and mismatching is not easy.
Description
Technical Field
The invention relates to the technical field of structures covering large-area spaces, in particular to a large-span overhanging roof with a compact structure and difficult overturning and a construction method thereof.
Background
When a large-scale relic venue is designed, a roof/ceiling is required to be overhung, so that at least one side below a building is open, a column for shielding a view or affecting traffic is not arranged in front of the building, and the large-scale relic venue has a wide view and a wide traffic space so as to meet requirements of sightseeing, traffic and the like.
However, the overhanging structure is extremely unfavorable for stress, the overhanging means that the stress is characterized by no redundant constraint, and once the root of the cantilever is in question, the whole overhanging structure is destroyed. In addition, with the increase of overhanging span, the problem that is rarely encountered in general building structures is also brought: is easy to topple. Because the center of gravity of the overhanging structure is not located just above the supporting system as in a general building, but is located outside the supporting system.
For the overhanging roof/ceiling, in order to solve the problem of easy overturning, in the prior art, a stress member is additionally added on the basis of the overhanging roof/ceiling to reinforce the overhanging roof/ceiling, and the following types of overhanging roof/ceiling are common:
a stay rope/diagonal draw bar is added above the cable;
a three-angle brace is added below the upper part of the upper part;
the overhanging roof/ceiling is made into a closed ring shape, and the outer side of the ring is a whole cylindrical wall or steel structure support.
However, all the stress components have obvious influence on the appearance of the building and occupy the building space.
Taking a stadium as an example, the stadium needs to have a overhanging roof overhanging 39 meters, and the roof cannot be made into a closed ring shape due to the requirement on the appearance, and a stay cable/rod or a triangular support cannot be used (the stay cable/rod influences the appearance, and the triangular support interferes with a stair stand in the building).
Disclosure of Invention
The invention provides a large-span overhanging roof with a compact structure and difficult overturning and a construction method thereof.
The technical problems to be solved are as follows: the large-span overhanging roof is easy to overturn, and the existing overturning overcoming means is not compact enough, so that the appearance of the building is influenced.
In order to solve the technical problems, the invention adopts the following technical scheme: the large-span overhanging roof with the compact structure and difficult overturning comprises a plurality of overhanging roof units which are arranged side by side and spliced into a whole, wherein the overhanging roof units are arranged on a swinging column and overhang by taking the swinging column as a starting point, the other end of each overhanging roof unit, which is away from an overhanging end, is provided with a prestress balance rope for preventing the overhanging end from sinking, one end of each prestress balance rope is connected to the overhanging roof unit, and the other end of each prestress balance rope sags and is fixed on an installation foundation;
the prestress balance rope is a prestress inhaul cable, the overhanging roof unit, the prestress balance rope and the swinging column form a laborious lever structure together, the swinging column is a fulcrum in the lever, the power in the laborious lever is the prestress in the prestress balance rope, and the resistance is the dead weight of the overhanging roof unit;
the non-bearing enclosures playing roles in edge constraint and enclosure are further arranged on the edges of the overhanging roof units and the prestress balance cables, the non-bearing enclosures are in one-to-one correspondence with the overhanging roof units, and depend from the edges of the overhanging roof units and are fixed on an installation foundation, and adjacent non-bearing enclosures are connected into a whole.
Further, the overhanging roof unit is a truss roof, an upper chord member of the truss roof is replaced by a single-layer steel grid, the non-bearing enclosure is a single-layer steel grid and is spliced with the single-layer steel grid on the upper layer of the truss roof into a whole, so that the truss roof is positioned.
Furthermore, a step stand fixed on the foundation is arranged below the overhanging roof unit, the highest side of the step stand is close to the non-bearing enclosure, the swing column is arranged at the top of the step stand, and the lower end of the prestress balance cable is fixed on the back of the step stand; the swing column is a V-shaped column, and the lower end of the V-shaped column is arranged on the ball hinge support.
Furthermore, two V-shaped columns and two prestress balance cables are arranged below each overhanging roof unit, the V-shaped columns and the prestress balance cables are symmetrically arranged on the left side and the right side of each overhanging roof unit, the upper ends of the two V-shaped columns are spliced together, and the lower ends of the two V-shaped columns are mutually separated.
Further, the overhanging roof unit extends downwards obliquely from the non-bearing enclosure, the overhanging roof unit is spliced into a closed or non-closed ring shape, and the non-bearing enclosure is arranged outside the ring and plays a role in wind shielding.
Further, the large-span overhanging roof is provided with deformation joints at the joints with other building structures.
The construction method of the large-span overhanging roof with compact structure and difficult overturning is used for constructing the large-span overhanging roof with compact structure and difficult overturning, and comprises the following steps of:
step one: mounting non-bearing enclosures and connecting the non-bearing enclosures with the mounted adjacent non-bearing enclosures into a whole;
step two: installing a swinging column;
step three: splicing overhanging roof units by taking the top of the non-bearing enclosure as a starting point, and connecting the overhanging roof units with the installed adjacent overhanging roof units into a whole;
step four: installing a prestress balance rope and tensioning;
step five: repeating the first to fourth steps until the installation of the whole large-span overhanging roof is completed, unloading and removing the temporary supporting structure supporting the non-bearing enclosure and the overhanging roof unit.
Further, the installation process of each overhanging roof unit, the corresponding swing column, the corresponding prestress balance rope and the corresponding non-bearing enclosure is collectively called as a working section;
in each working section, the installation and connection of the non-bearing enclosure do not need to consider the progress of the previous working section;
the swing column is installed after the non-bearing enclosure of the construction of the three working sections before the working section is installed;
splicing the overhanging roof unit and installing the swing post connected to the section;
the installation of the prestress balance cable is carried out after the overhanging roof units of the three working sections before the working section are assembled and connected.
Furthermore, the non-bearing enclosure is formed by splicing steel grid blocks, the overhanging roof unit is formed by splicing truss blocks in situ, and the lengths of the edges of the steel grid blocks at the tops of truss blocks adjacent to the non-bearing enclosure and the edges of the steel grid blocks at the tops of the non-bearing enclosure are equal and are tightly attached.
In the fourth step, the prestress balance rope is immediately tensioned to 10% tensile force after being installed, and the prestress balance rope of three working sections before the working section is tensioned to 70% tensile force after being installed;
the construction method further comprises the following steps: all the prestress balance ropes are tensioned to 100% tensile force from the middle part to the two sides in sequence.
Compared with the prior art, the large-span overhanging roof with compact structure and difficult overturning and the construction method thereof have the following beneficial effects:
according to the invention, the large-span overhanging roof is decomposed into a plurality of overhanging roof units, the overhanging roof units are then supported on the swing columns to form a structure similar to a 'teeterboard', one end of the 'teeterboard' is pulled by a prestress balance rope arranged in a building to avoid sinking of the other end (namely, overturning is avoided), and finally, no-bearing enclosure is used for shielding wind and increasing stability. The whole building is not easy to topple, has compact structure, and does not have extra stress members which influence the appearance of the building or cause interference;
according to the invention, the top layer of the overhanging roof unit and the non-bearing enclosure are both single-layer steel grids, and after the overhanging roof unit is installed by the non-bearing enclosure, the top of the non-bearing enclosure is used as a position reference block for in-situ assembly, so that the requirement of complex modeling can be met, and the position is accurate and is not easy to misspell.
Drawings
FIG. 1 is a schematic structural view of a large-span overhanging roof with compact structure and less possibility of overturning;
FIG. 2 is a schematic diagram of a stress mode of a large-span overhanging roof with compact structure and difficult overturning;
FIG. 3 is a perspective view of an overhanging roof unit;
FIG. 4 is a schematic view of a construction process of a large-span overhanging roof with compact structure and difficult overturning in the invention;
in the figure, the roof unit is 1-encorbelmented, the column is swayed to 2-, 3-prestressing force balance cable, 4-non-bearing enclosure, 5-deformation joint, 6-ladder stand.
Detailed Description
Note that "large-span overhanging" herein means that the horizontal distance span of the overhanging roof unit 1 from the fulcrum to the overhanging end is large. There is no limitation on the span in other directions.
Taking a stadium related to the invention as an example, as shown in fig. 1, a large-span overhanging roof with compact structure and difficult overturning comprises a plurality of overhanging roof units 1 which are arranged side by side and spliced into a whole, wherein the overhanging roof units 1 are arranged on swinging columns 2 and are overhanging by taking the swinging columns 2 as starting points, the other end of the overhanging roof units 1, which is away from an overhanging end, is provided with a prestress balance rope 3 for preventing the overhanging end from sinking, one end of the prestress balance rope 3 is connected to the overhanging roof units 1, and the other end of the prestress balance rope is drooped and fixed on an installation foundation;
the prestressing balancing cable 3 here, as the name implies, has a prestressing force therein to counteract the tendency of the overhanging roof unit 1 to topple. The large-span overhanging roof is divided into a plurality of overhanging roof units 1 and spliced, so that the stress condition is clear, and the large-span overhanging roof can be directly reflected into obvious deformation when uneven stress exists. When the whole overhanging roof unit 1 is stretched, if uneven stress occurs, secondary stress is caused in the whole building, the secondary stress is not only uncontrollable, but also is difficult to see as a plurality of overhanging roof units 1 are spliced, and the whole building is deformed and even damaged for a long time.
As shown in fig. 2, the prestress balance rope 3 is a prestress cable, the overhanging roof unit 1, the prestress balance rope 3 and the swing post 2 together form a laborious lever structure, the swing post 2 is a fulcrum in the lever, the power in the laborious lever is the prestress in the prestress balance rope 3, and the resistance is the dead weight of the overhanging roof unit 1;
the swing column 2 is adopted, so that the column does not need to bear horizontal load, and the horizontal load is completely transferred to the prestress balance rope 3, so that the cross section size of the column can be remarkably reduced, and the building structure is more compact. The laborious lever is used in order to reduce the size of the portion of the overhanging roof unit 1 behind the swing post 2.
The edge of the overhanging roof unit 1 and the prestressed balance rope 3 is also provided with non-bearing enclosures 4 which play a role in edge constraint and enclosure, the non-bearing enclosures 4 are in one-to-one correspondence with the overhanging roof unit 1, and the non-bearing enclosures 4 hang down from the edge of the overhanging roof unit 1 and are fixed on an installation foundation, and adjacent non-bearing enclosures 4 are connected into a whole.
The non-bearing enclosure 4 has the advantages that the non-bearing enclosure 4 is non-bearing, has the functions of restraining and enclosing, and is used as a starting point for splicing the overhanging roof unit 1 in the construction process, so that the overhanging roof unit 1 is prevented from being spliced and askew.
As shown in fig. 3, the overhanging roof unit 1 is a truss roof, an upper chord member of the truss roof is replaced by a single-layer steel grid, the non-bearing enclosure 4 is a single-layer steel grid, and the single-layer steel grid on the upper layer of the truss roof are spliced into a whole, so that a positioning effect is achieved on the truss roof.
Truss roofs are usually composed of upper chords, lower chords and web members, wherein the upper chords are replaced by single-layer steel grids, so that roof panels are conveniently paved, and the truss roofs are conveniently aligned with the tops of non-bearing enclosures 4 to play a role in positioning.
A step stand 6 fixed on a foundation is arranged below the overhanging roof unit 1, the highest side of the step stand 6 is close to the non-bearing enclosure 4, the swinging column 2 is arranged at the top of the step stand 6, and the lower end of the prestress balance cable 3 is fixed on the back of the step stand 6; the swing column 2 is a V-shaped column, and the lower end of the V-shaped column is arranged on the ball hinge support.
Here, the spherical hinge support is used to realize the pitching of the overhanging roof unit 1, instead of the pin in the "teeterboard", because the overhanging roof unit 1 is not a regular plate, and the pin is difficult to install. The spherical hinge is universal, and the difficulty in mounting the pin shaft is avoided. Meanwhile, the step stand 6 exists on site, so that the length of the swing column 2 can be greatly shortened, the V-shaped column is adopted, a lot of space is not occupied, and the stability is improved reversely.
Two V-shaped columns and two prestress balance cables 3 are arranged below each overhanging roof unit 1, the V-shaped columns and the prestress balance cables 3 are symmetrically arranged on the left side and the right side of each overhanging roof unit 1, the upper ends of the two V-shaped columns are spliced together, and the lower ends of the two V-shaped columns are separated from each other.
The two V-shaped columns are installed in a similar way that the tops of fingers of two hands which are more than the V-shaped are propped against one another, so that the overhanging roof unit 1 can pitch and simultaneously can avoid overturning on the left side and the right side.
The overhanging roof unit 1 extends downwards obliquely from the non-bearing enclosure 4, the overhanging roof unit 1 is spliced into a closed or non-closed ring shape, and the non-bearing enclosure 4 is arranged outside the ring and plays a role in wind shielding.
The non-bearing enclosure 4 encloses the overhanging roof unit 1 and internal components on the inner side, so that the overhanging roof unit 1 is prevented from shaking due to wind load.
As shown in fig. 1, the large span overhanging roof is provided with deformation joints 5 at the joints with other building structures. The stress condition of the large-span overhanging roof is quite special, and the direct connection with other building structures can cause unexpected adverse effects on both sides, and the difficulty of stress analysis before construction can be greatly improved, so that the large-span overhanging roof needs to be broken by using the deformation joint 5.
As shown in fig. 4, a construction method of a large-span overhanging roof with compact structure and difficult overturning is used for constructing the large-span overhanging roof with compact structure and difficult overturning, and comprises the following steps:
step one: the non-bearing enclosure 4 is installed and connected with the installed and adjacent non-bearing enclosure 4 into a whole;
step two: installing a swing column 2;
step three: splicing overhanging roof units 1 by taking the top of the non-bearing enclosure 4 as a starting point, and connecting the overhanging roof units with the installed adjacent overhanging roof units 1 into a whole;
step four: installing a prestress balance rope 3 and tensioning;
step five: and repeating the steps one to four until the installation of the whole large-span overhanging roof is completed, unloading and removing the temporary supporting structures for supporting the non-bearing enclosure 4 and the overhanging roof unit 1.
As shown in fig. 4, the temporary support structure of the non-load bearing enclosure 4 is here a scaffold, whereas the temporary support structure of the large span overhanging roof is a moulding bed consisting of a plurality of truss columns.
The installation process of each overhanging roof unit 1, the corresponding swinging column 2, the prestress balance rope 3 and the non-bearing enclosure 4 is commonly called as a working section;
in each working section, the installation and connection of the non-bearing enclosure 4 do not need to consider the progress of the previous working section; the cantilever roof unit 1 is an assembly starting point, and is not load-bearing, so that the cantilever roof unit can be installed at first and the construction progress is foremost.
The swinging column 2 is installed after the non-bearing enclosure 4 constructed in the three working sections before the working section is installed; splicing the overhanging roof unit 1 and installing the swing post 2 connected to the section;
after the swing post 2 is installed, the overhanging roof unit 1 is assembled in situ, so that the construction of three working sections before the working section is needed to be completed, and the assembled overhanging roof unit 1 is prevented from being askew to the installed non-bearing enclosure 4.
The installation of the prestress balance cable 3 is carried out after the overhanging roof units 1 of the three working sections before the working section are assembled and connected. The installation of the prestress balancing cable 3 can lead to certain deformation of the overhanging roof unit 1, so that the overhanging roof unit 1 of three working sections before the working section is needed to be assembled, otherwise, the connection of the follow-up overhanging roof unit 1 can be influenced.
The non-bearing enclosure 4 is formed by splicing steel grid blocks, the overhanging roof unit 1 is formed by splicing truss blocks in situ, and the edge of the steel grid block at the top of the truss block adjacent to the non-bearing enclosure 4 is equal to the edge length of the steel grid block at the top of the non-bearing enclosure 4 in length and is tightly attached.
The steel grid blocks are assembled in a blocking mode to improve construction efficiency, and meanwhile, whether the steel grid blocks are aligned or not is clear at a glance, so that the steel grid block assembling method is helpful for assembling precision.
In the fourth step, the prestress balance rope 3 is stretched to 10% of stretching force immediately after being installed, and the prestress balance rope 3 of the three working sections before the working section is stretched to 70% of stretching force after being installed;
the construction method further comprises the following steps: all the prestress balance ropes 3 are tensioned to 100% from the middle to the two sides in sequence.
The 100% stretching force is aimed at the whole large-span overhanging roof instead of the single overhanging roof unit 1, so stretching is needed after the installation of the large-span overhanging roof is completed. Note that the large-span overhanging roof is separated from the jig frame when the stretching is performed to 70% of the stretching force by designing the stretching force, so that most of unloading processes can be completed in the stretching process.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The utility model provides a compact structure and difficult large-span roof that encorbelments who overturns which characterized in that: the cantilever roof unit (1) is arranged side by side and spliced into a whole, the cantilever roof unit (1) is arranged on a swinging column (2) and overhangs by taking the swinging column (2) as a starting point, the other end of the cantilever roof unit (1) deviating from the overhanging end is provided with a prestress balance rope (3) for preventing the overhanging end from sinking, one end of the prestress balance rope (3) is connected to the cantilever roof unit (1), and the other end of the prestress balance rope sags;
a step stand (6) fixed on a foundation is arranged below the overhanging roof unit (1), the highest side of the step stand (6) is close to the non-bearing enclosure (4), and the lower end of the prestress balance cable (3) is fixed on the back of the step stand (6);
the prestress balance cable (3) is a prestress cable, the overhanging roof unit (1), the prestress balance cable (3) and the swing column (2) form a laborious lever structure together, the swing column (2) is a fulcrum in a lever, the power in the laborious lever is the prestress in the prestress balance cable (3), and the resistance is the dead weight of the overhanging roof unit (1);
the non-bearing enclosures (4) playing a role in edge constraint and enclosure are further arranged on the edges of the overhanging roof units (1) and the prestress balance cables (3), the non-bearing enclosures (4) are in one-to-one correspondence with the overhanging roof units (1), and drop from the edges of the overhanging roof units (1) and are fixed on an installation foundation, and adjacent non-bearing enclosures (4) are connected into a whole;
the cantilever roof unit (1) extends downwards obliquely from the non-bearing enclosure (4), the cantilever roof unit (1) is spliced into a closed or non-closed ring shape, and the non-bearing enclosure (4) is arranged outside the ring and plays a role in wind shielding.
2. The large-span overhanging roof with compact structure and uneasy overturning according to claim 1, which is characterized in that: the cantilever roof unit (1) is a truss roof, an upper chord member of the truss roof is replaced by a single-layer steel grid, and the non-bearing enclosure (4) is a single-layer steel grid and is spliced with the single-layer steel grid on the upper layer of the truss roof into a whole to play a role in positioning the truss roof.
3. The large-span overhanging roof with compact structure and uneasy overturning according to claim 1, which is characterized in that: the swinging column (2) is arranged at the top of the step stand (6), the swinging column (2) is a V-shaped column, and the lower end of the V-shaped column is arranged on the ball hinge support.
4. A compact and non-toppling large span overhanging roof according to claim 3, characterized in that: two V-shaped columns and two prestress balance cables (3) are arranged below each overhanging roof unit (1), the V-shaped columns and the prestress balance cables (3) are symmetrically arranged on the left side and the right side of each overhanging roof unit (1), the upper ends of the two V-shaped columns are spliced together, and the lower ends of the two V-shaped columns are separated from each other.
5. The large-span overhanging roof with compact structure and uneasy overturning according to claim 1, which is characterized in that: the large-span overhanging roof is provided with a deformation joint (5) at the joint of the large-span overhanging roof and other building structures.
6. A construction method of a large-span overhanging roof which is compact in structure and not easy to overturn is characterized by comprising the following steps: a compact and non-toppling large span overhanging roof for construction according to claim 2, comprising the steps of:
step one: the non-bearing enclosure (4) is installed and connected with the installed and adjacent non-bearing enclosure (4) into a whole;
step two: installing a swing column (2);
step three: splicing overhanging roof units (1) by taking the top of the non-bearing enclosure (4) as a starting point, and connecting the overhanging roof units with the installed adjacent overhanging roof units (1) into a whole;
step four: installing a prestress balance rope (3) and tensioning;
step five: repeating the first to fourth steps until the installation of the whole large-span overhanging roof is completed, unloading and removing the temporary supporting structures supporting the non-bearing enclosure (4) and the overhanging roof unit (1).
7. The construction method of the large-span overhanging roof with compact structure and difficult overturning as claimed in claim 6, which is characterized in that: the installation process of each overhanging roof unit (1), the corresponding swinging column (2), the prestress balance rope (3) and the non-bearing enclosure (4) is commonly called as a working section;
in each working section, the installation and connection of the non-bearing enclosure (4) do not need to consider the progress of the previous working section;
the non-bearing enclosure (4) of the swing column (2) which is installed in the three working sections before the working section is installed and then carried out;
splicing the overhanging roof unit (1) and installing the swing post (2) connected to the section;
the installation of the prestress balance cable (3) is carried out after the assembly and connection of the overhanging roof units (1) of the three working sections before the working section.
8. The construction method of the large-span overhanging roof with compact structure and difficult overturning according to claim 7, which is characterized in that: the non-bearing enclosure (4) is formed by splicing steel grid blocks, the overhanging roof unit (1) is formed by splicing truss blocks in situ, and the edge of the steel grid block at the top of the truss block adjacent to the non-bearing enclosure (4) is equal to the edge length of the steel grid block at the top of the non-bearing enclosure (4) in length and is tightly attached.
9. The construction method of the large-span overhanging roof with compact structure and difficult overturning according to claim 7, which is characterized in that: in the fourth step, the prestress balance rope (3) is stretched to 10% of stretching force immediately after being installed, and the prestress balance rope (3) of three working sections before the working section is stretched to 70% of stretching force after being installed;
the construction method further comprises the following steps: all the prestress balance ropes (3) are sequentially tensioned to 100% from the middle to the two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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