CN111335476A - Staggered floor steel mesh frame subsection lifting accumulative assembling construction method - Google Patents
Staggered floor steel mesh frame subsection lifting accumulative assembling construction method Download PDFInfo
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- CN111335476A CN111335476A CN202010254380.7A CN202010254380A CN111335476A CN 111335476 A CN111335476 A CN 111335476A CN 202010254380 A CN202010254380 A CN 202010254380A CN 111335476 A CN111335476 A CN 111335476A
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- steel
- net rack
- steel net
- steel mesh
- lifting
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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
- 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
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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
- E04G21/16—Tools or apparatus
- E04G21/162—Handles to carry construction blocks
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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
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
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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
- E04B2001/3577—Extraordinary methods of construction, e.g. lift-slab, jack-block prefabricating a building and moving it as a whole to the erection site
Abstract
A staggered floor steel mesh frame subsection lifting accumulative assembling construction method belongs to the technical field of steel mesh frame construction. The method is characterized in that: the method comprises the following steps: step 1), splicing a plurality of square frames on an adjustable support (10) on the ground through a lower chord (3); step 2), arranging an upper chord ball (2) in the middle of the upper side of each square frame, and connecting the upper chord ball (2) with a lower chord ball (1) of the corresponding square frame through a web member (4); step 3) repeating the step 1) to the step 2) to form the splicing of the first section of the steel net rack; step 4), hoisting the first section of steel net rack to a certain height; step 5) repeating the steps 1) to 3) to sequentially complete the splicing of the steel mesh frames of all sections; step 6), hoisting the spliced steel truss to the upper part of the support; and 7) descending the steel net rack until the peripheral rod piece is supported on the support. The invention avoids building an assembly bracket, has accurate positioning, high construction speed, ensured quality and low construction cost.
Description
Technical Field
A staggered floor steel mesh frame subsection lifting accumulative assembling construction method belongs to the technical field of steel mesh frame construction.
Background
The steel grid structure is a spatial structure formed by connecting a plurality of rod pieces through nodes according to a certain network form, is widely used as a roof structure of a gymnasium, an exhibition hall, a movie theater, a waiting hall, a workshop and the like, has the advantages of space stress, light weight, high rigidity, good earthquake resistance, high industrialization degree, attractive appearance and the like, and the common construction method comprises the following steps: the method comprises the following steps of an overhead bulk loading method, a strip or block mounting method, an overhead sliding method, an integral hoisting method, an integral lifting method and an integral jacking method. However, when the ground is a stepped ground, a high-altitude bulk loading method or an integral lifting method is generally adopted.
An overhead bulk packaging method: the full-height scaffold needs to be erected before the steel mesh frame is installed, and the steel mesh frame can be disassembled after the steel mesh frame is installed and unloaded, so that the method is long in construction period and extremely high in construction cost. And (3) integral lifting method: need set up full hall scaffold frame before the steel mesh frame installation and level with ladder ground lining, then wholly assemble the steel mesh frame again, the steel mesh frame promotes the back full hall scaffold frame and can demolish, and construction cycle is shorter relatively, but the operating expenses is still higher.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the ground assembling and the early-stage lifting in-process assembling are combined, and the staggered floor steel net rack segmented lifting accumulated assembling construction method for the influence of the step floor on the steel net rack assembling is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the staggered floor steel mesh frame subsection lifting assembling installation construction method is characterized in that: the method comprises the following steps:
step 1) splicing a plurality of square frames arranged side by side on an adjustable support on the ground through lower chords, wherein every two adjacent lower chords are connected through a lower chord ball;
step 2) arranging an upper chord ball in the middle of the upper side of each square frame, and connecting the upper chord ball with a lower chord ball of the corresponding square frame through a web member to form a first span steel net rack;
step 3) repeating the step 1) to the step 2) to form the splicing of the first section of the steel net rack;
step 4) arranging an auxiliary hanging bracket on the first section of steel net rack, and hoisting the first section of steel net rack to a certain height;
step 5) repeating the steps 1) to 3), and sequentially completing the splicing of the steel net frames of all sections along the ground from the low position to the high position;
step 6), hoisting the spliced steel truss to the upper part of the support;
and 7) welding a peripheral rod piece at the side part of the steel net rack, and then enabling the steel net rack to descend until the peripheral rod piece is supported on the support, thereby completing the construction of the steel net rack.
Preferably, the adjustable support in the step 1) comprises a vertically arranged thread bushing and a screw rod, the screw rod is arranged on the lower side of the thread bushing, the upper end of the screw rod is in threaded connection with the thread bushing, and a bottom plate is arranged at the lower end of the screw rod.
Preferably, the square frames in step 1) are measured by a level gauge, so that the square frames in step 1) are ensured to be positioned in the same horizontal plane.
Preferably, diagonal bracing wires are arranged in each square frame in the step 2), and the diagonal bracing wires are matched with the web members to position the upper chord balls.
Preferably, the auxiliary hanging frame in the step 4) is in a triangular pyramid shape, the auxiliary hanging frame is arranged on the outer side of the steel net rack, and one side of the auxiliary hanging frame, which is far away from the steel net rack, protrudes downwards from the steel net rack.
Preferably, the first steel wire frame is lifted by a chain block.
Preferably, one side of the steel net frame in the extending direction in the step 5) is supported by a tripod.
Preferably, the steel net frame in the step 6) is positioned at the upper side of the support by 100-200 mm.
Preferably, the peripheral rod pieces and the corresponding supports in the step 7) are welded, and the auxiliary hanging bracket is detached after the welding is finished.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the staggered floor steel mesh frame subsection lifting accumulated assembly installation construction method, the steel mesh frames are assembled in a subsection mode along the direction from low to high of the ground, each section of steel mesh frame is lifted after being assembled, and the ground assembly is combined with the assembly in the early lifting process, so that the assembly support is prevented from being erected, the positioning is accurate, the construction speed is high, the quality is guaranteed, and the construction cost is low; the preset hoisting points are combined with the auxiliary hoisting points, the whole is lifted after the preset hoisting points and the auxiliary hoisting points are spliced into a whole in a segmented and accumulated manner, and finally the high-altitude edge sealing is carried out, so that the construction method is simple, the field operation of workers is convenient, the construction speed is high, and the exposure time of a hazard source is greatly shortened; the steel mesh frame is assembled on the ground, so that the overhead operation is reduced; the invention is generally used for the installation of large space steel net racks with staggered floor elevations in industrial and civil buildings, and is particularly suitable for the installation of large space steel net racks on stepped floors.
2. The lower chord ball is supported by matching the threaded sleeve with the screw rod, the lower end of the screw rod is provided with the bottom plate, the support is more stable, and the support height is convenient to adjust.
3. The square frames in the step 1) are positioned in the same horizontal plane, so that the whole steel net rack can be ensured to be horizontal.
4. Through the diagonal bracing wire arranged in the square frame, the upper chord ball can be positioned in the horizontal plane, and the upper chord ball can be integrally positioned by matching with the web member.
5. Supplementary gallows is three-edged cone, and stability is stronger, and the one side downward protrusion in the steel rack setting of keeping away from the steel rack of supplementary gallows, makes the bearing capacity of supplementary gallows stronger.
6. One side of the steel net rack extending direction is supported by the tripod, so that the first section of the steel net rack can be ensured to be more stable after being lifted, and the interference on the subsequent steel net rack assembly can be avoided.
7. The steel net rack is located 100-200mm above the support, so that the interference on the welding of the peripheral rod piece can be avoided, and the positioning of the peripheral rod piece is facilitated.
Drawings
Fig. 1 is a perspective view of a steel net frame.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a front view of the auxiliary hanger installation.
Fig. 4 is a schematic diagram of the steel framework positioning by section.
Fig. 5 is a partially enlarged view of B in fig. 4.
In the figure: 1. the lower chord ball 2, the upper chord ball 3, the lower chord 4, the web members 5, the upper chord 6, the supporting plate 7, the supporting rod 8, the auxiliary hanger 9, the tripod 10, the adjustable support 11, the threaded sleeve 12, the screw 13 and the bottom plate.
Detailed Description
Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further described with reference to fig. 1 to 5.
As shown in FIGS. 1 to 3: the steel net frame is formed by splicing a plurality of regular triangular pyramid frames which are arranged side by side. The bottom of steel net rack is the square frame that many lower chords 3 concatenation formed, and a plurality of square frame all are located same horizontal plane. Every two adjacent lower chords 3 are connected through a lower chord ball 1.
The middle part of the upper side of each square frame is opposite to an upper chord ball 2, the upper chord balls 2 and the square frames are arranged at intervals, and each upper chord ball 2 is connected with a lower chord ball 1 of the corresponding square frame through a web member 4 to form a plurality of regular triangular pyramid-shaped frames.
Every two adjacent upper chords 2 are connected through the upper chord 5, so that the whole steel truss forms a stable whole.
The upper side of each upper string ball 2 is provided with a vertical supporting rod 7, the upper side of each supporting rod 7 is provided with a square supporting plate 6, the lower end of each supporting rod 7 is fixedly connected with the middle of the corresponding upper string ball 2, and the upper end of each supporting rod is fixedly connected with the middle of the corresponding supporting plate 6, so that the upper side is conveniently supported.
A plurality of auxiliary hanging brackets 8 are uniformly distributed at intervals on the side part surrounding the steel net rack, each auxiliary hanging bracket 8 is a triangular cone, each rod piece of each auxiliary hanging bracket 8 is welded with the corresponding lower string ball 1 and the upper string ball 2, so that the triangular cone is formed, one side of each auxiliary hanging bracket 8, which is far away from the steel net rack, protrudes downwards from the steel net rack and is arranged to form a lifting part, and the lifting strength of the auxiliary hanging brackets 8 is improved.
As shown in FIGS. 4-5: the staggered floor steel mesh frame subsection lifting accumulative assembling construction method comprises the following steps:
step 1) splicing a plurality of square frames arranged side by side on an adjustable support 10 on the ground through lower chords 3, wherein every two adjacent lower chords 3 are connected through a lower chord ball 1;
according to a design drawing, a Tekla model (comprising an auxiliary hanging bracket 8) of the steel net rack is established, the position and the size of each component of the steel net rack are optimized, and the stress condition of the steel net rack is analyzed. And then analyzing the stress condition of the steel net rack during construction by utilizing SFCAD. And forming a blanking list after a model is established by Tekla, numbering each component, and processing each component of the steel net rack according to the blanking list in a factory, wherein the manufacturing error is +/-1.0 mm. After the processing is finished, the steel net frame members are packaged and transported to an installation site, and the steel net frame members are packaged together with the same length.
In this embodiment, the steel truss is hoisted in three stages according to actual conditions, that is, the steel truss is assembled in three stages.
Set up the built-in fitting at the upside of boundary beam, form the preparation, the built-in fitting includes dowel, anchor slab and rings, and the dowel chooses tertiary steel for use, diameter 25mm, and the dowel is provided with 9, and the anchor slab size is the Q235 steel sheet of 500X500X30mm, and rings adopt 25 # round steel. The anchor bars are embedded in the side beams, the anchor plates are welded with the anchor bars, so that the anchor plates are fixed, and the lifting rings are welded with the anchor plates, so that the connection of the chain block is facilitated.
According to the size of a steel net rack and the projection on a plane, an adjustable support 10 is placed on the ground, a lower string ball 1 is placed on the adjustable support 10, a positioning line is pulled longitudinally and transversely to determine the central cross line of the lower string ball 1, a lower string rod 3 is arranged between the adjacent lower string balls 1, the lower string rod 3 and the adjacent lower string balls 1 are welded to form a plurality of square frames which are arranged side by side, and a leveling instrument is used for measuring, so that the plurality of square frames are in the same horizontal plane.
Adjustable brace 10 includes thread bush 11 and screw rod 12, and thread bush 11 and the equal vertical setting of screw rod 12, and the coaxial setting of screw rod 12 is at the downside of thread bush 11, and in the thread bush 11 was stretched into to the upper end of screw rod 12 to with 11 threaded connection of thread bush, the lower extreme of screw rod 12 was provided with square bottom plate 13, and bottom plate 13 is square steel sheet, the lower extreme of screw rod 12 and the middle part fixed connection of bottom plate 13. The upper end of the threaded sleeve 11 is supported at the bottom of the corresponding lower string ball 1, so that the lower string ball 1 is supported, and the height of the lower string ball 1 is conveniently adjusted to ensure that the lower string balls 1 are positioned in the same horizontal plane.
Step 2) arranging an upper chord ball 2 in the middle of the upper side of each square frame, and connecting the upper chord ball 2 with a lower chord ball 1 of the corresponding square frame through a web member 4 to form a first span steel net rack;
diagonal bracing wires are arranged in each square frame, the upper chord ball 2 is positioned on a construction working face, the intersection points of the upper chord ball 2 and the corresponding diagonal bracing wires are overlapped, then a web member 4 is arranged between the upper chord ball 2 and the lower chord ball 1 of the square frame corresponding to the upper chord ball 2, the upper end of the web member 4 is welded with the corresponding upper chord ball 2, the lower end of the web member is welded with the corresponding lower chord ball 1, and the positioning and the assembling of the upper chord ball 2 are formed, so that the first span steel net rack is formed.
Step 3) repeating the step 1) to the step 2) to form the splicing of the first section of the steel net rack;
and (3) repeating the step 1) to the step 2), and sequentially splicing the steel net racks along the direction from low to high on the ground to form the splicing of the first section of the steel net rack.
Step 4) arranging an auxiliary hanging bracket 8 on the first section of steel net rack, and hoisting the first section of steel net rack to a certain height;
after the first section of steel mesh frame is spliced, the three sides of the first section of steel mesh frame, which are close to the wall body, are all provided with auxiliary hanging brackets 8, and one side beam of each auxiliary hanging bracket 8 corresponds to one side beam. After the auxiliary hanger 8 is welded, the first section of steel mesh frame is coated, welding slag, smoke dust, splashes and the like are cleaned up before painting, paint is firstly sprayed for the first time by a spray gun, paint is sprayed for the second time after natural air drying, damage in the transportation and assembly processes and welding seams on the site are repaired on the ground as far as possible before hoisting, and therefore high-place operation workload after hoisting is reduced.
And hoisting after the welding line is detected to be qualified. The support of every boundary beam all is provided with the chain block between the supplementary gallows 8 that corresponds, sets up tripod 9 in one side of first section steel net rack extending direction, the three-edged cone shape of tripod 9, and the top of tripod 9 also is provided with rings. The quantity of tripod 9 is confirmed according to the length of side of first section steel rack, also is provided with the chain block between the rings of tripod 9 and the first section steel rack, promotes first section steel rack through the chain block.
Step 5) repeating the steps 1) to 3), and sequentially completing the splicing of the steel net frames of all sections along the ground from the low position to the high position;
and after the first section of steel net rack is lifted to a set elevation, repeating the steps 1) to 3) to perform accumulative splicing on the steel net rack, thereby completing splicing of three sections of steel net racks.
Step 6), hoisting the spliced steel truss to the upper part of the support;
after the steel mesh frame ground is assembled, the steel mesh frame is integrally lifted. And (3) performing trial hoisting before formal hoisting, stopping hoisting after the trial hoisting is separated from the adjustable support 10, checking the stress condition of the steel mesh frame, continuing hoisting under all normal conditions, keeping the hoisting speed of each hoisting point as consistent as possible, and stopping hoisting when the steel mesh frame is hoisted to the height of the support by about 100-200 mm.
Step 7) welding a peripheral rod piece at the side part of the steel net rack, and then enabling the steel net rack to descend until the peripheral rod piece is supported on the support to complete the construction of the steel net rack;
after the steel net rack is lifted to the set elevation, the position of the steel net rack is adjusted through the chain block, and enough space for welding the peripheral rod pieces is reserved between the steel net rack and the outer side. And peripheral rod pieces are welded on the outer side of the steel mesh frame, and the peripheral rod pieces correspond to the supports one to one. And after the welding seam is detected to be qualified, the steel mesh frame falls to the support, the support and the corresponding peripheral rod piece are welded, the temporary hanging point can be disassembled after the support and the corresponding peripheral rod piece are completely welded, and the steel mesh frame is completely installed.
After the installation and the fixation of the steel mesh frame are finished, the welding part of the peripheral rod piece of the steel mesh frame is coated, the coating damage in the construction process of the steel mesh frame is checked, and the coating is repaired. And after finishing coating, finishing the installation of the steel net frame.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a staggered floor steel mesh frame segmentation promotes tired to assemble installation construction method which characterized in that: the method comprises the following steps:
step 1), splicing a plurality of square frames arranged side by side on an adjustable support (10) on the ground through lower chords (3), wherein every two adjacent lower chords (3) are connected through a lower chord ball (1);
step 2), arranging an upper chord ball (2) in the middle of the upper side of each square frame, and connecting the upper chord ball (2) with a lower chord ball (1) of the corresponding square frame through a web member (4) to form a first steel spanning net rack;
step 3) repeating the step 1) to the step 2) to form the splicing of the first section of the steel net rack;
step 4), arranging an auxiliary hanging bracket (8) on the first section of steel net rack, and hoisting the first section of steel net rack to a certain height;
step 5) repeating the steps 1) to 3), and sequentially completing the splicing of the steel net frames of all sections along the ground from the low position to the high position;
step 6), hoisting the spliced steel truss to the upper part of the support;
and 7) welding a peripheral rod piece at the side part of the steel net rack, and then enabling the steel net rack to descend until the peripheral rod piece is supported on the support, thereby completing the construction of the steel net rack.
2. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: the adjustable support (10) in the step 1) comprises a vertically arranged thread bushing (11) and a screw rod (12), the screw rod (12) is arranged on the lower side of the thread bushing (11), the upper end of the screw rod (12) is in threaded connection with the thread bushing (11), and a bottom plate (13) is arranged at the lower end of the screw rod (12).
3. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: measuring the square frames in the step 1) through a level gauge, and ensuring that the square frames in the step 1) are positioned in the same horizontal plane.
4. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: diagonal bracing wires are arranged in each square frame in the step 2), and the diagonal bracing wires are matched with the web members (4) to position the upper chord balls (2).
5. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: the auxiliary hanging bracket (8) in the step 4) is in a triangular pyramid shape, the auxiliary hanging bracket (8) is arranged on the outer side of the steel net rack, and one side, far away from the steel net rack, of the auxiliary hanging bracket (8) protrudes downwards out of the steel net rack.
6. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: and lifting the first section of steel net rack through a chain block.
7. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: one side of the steel net frame in the step 5) in the extending direction is supported by a tripod (9).
8. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: and 6), the steel net frame is positioned at the upper side of the support by 100-200 mm.
9. The staggered floor steel mesh frame subsection-lifting accumulative erection construction method according to claim 1, characterized in that: and (5) welding the peripheral rod piece in the step (7) with the corresponding support, and removing the auxiliary hanging bracket (8) after the welding is finished.
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| CN113653181A (en) * | 2021-09-27 | 2021-11-16 | 合肥赛欧机械制造有限公司 | Steel structure net rack |
| CN113833279A (en) * | 2021-10-28 | 2021-12-24 | 中国一冶集团有限公司 | Integral jacking construction method for deformed steel net rack with height difference during mounting of support |
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| CN112267568A (en) * | 2020-11-06 | 2021-01-26 | 中铁二十局集团市政工程有限公司 | Steel truss structure sectional hoisting construction method |
| CN112267568B (en) * | 2020-11-06 | 2022-05-17 | 中铁二十局集团市政工程有限公司 | Steel truss structure sectional hoisting construction method |
| CN113883337A (en) * | 2021-09-26 | 2022-01-04 | 山东华尔泰建筑工程有限公司 | Be applied to fire pipeline erection mechanism in spherical rack steel construction workshop of individual layer |
| CN113653181A (en) * | 2021-09-27 | 2021-11-16 | 合肥赛欧机械制造有限公司 | Steel structure net rack |
| CN113833279A (en) * | 2021-10-28 | 2021-12-24 | 中国一冶集团有限公司 | Integral jacking construction method for deformed steel net rack with height difference during mounting of support |
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| CN111335476B (en) | 2021-06-08 |
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