CN110424533B - Down-warping-preventing construction method for high-altitude overhanging installation of large-area net rack - Google Patents
Down-warping-preventing construction method for high-altitude overhanging installation of large-area net rack Download PDFInfo
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- CN110424533B CN110424533B CN201910731144.7A CN201910731144A CN110424533B CN 110424533 B CN110424533 B CN 110424533B CN 201910731144 A CN201910731144 A CN 201910731144A CN 110424533 B CN110424533 B CN 110424533B
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
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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
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Abstract
The invention provides a construction method for preventing downward deflection of a large-area net rack in high-altitude overhanging installation, which comprises the following steps of: the middle two trusses are taken as starting spans to be installed firstly; taking the starting span as a reference surface, and installing other overhanging installation spans on two sides in a diffusion mode; in the process of cantilever diffusion installation, the deflection of a cantilever installation spanning net rack is monitored, and when about three grids are installed in a diffusion mode, a holding pole is added to serve as a temporary support; the top of the holding pole is connected with the lower string ball of the net rack through a chain block; adjusting the deflection through a chain block; when the structure column is installed, the holding pole is loosened and the chain block is removed; repeating the operation and continuously diffusing construction cantilever mounting spans to two sides; the method avoids the erection of the full-space red scaffold and the occupation of a construction site by a large area and a long time until the installation of the net rack is finished, saves a large amount of lease cost, avoids the lattice type support manufacturing cost, saves a large amount of steel, reduces the manual investment, can alternately use the holding rods, and is simple, convenient and quick to adjust the downwarping value, thereby shortening the construction period.
Description
Technical Field
The invention relates to a large-scale net rack construction technology, in particular to a method for preventing a large-area net rack from being warped downwards during high-altitude overhanging installation.
Background
With the increasing tightening of the national environmental protection policy, the sealing of the raw material yard of the factories such as various steel mills, cement plants, power plants and the like becomes a great trend of environmental protection engineering, and the requirements of the interior of large public and civil buildings on the use space are higher and higher. The space grid structure meets the requirements of the building on space and cost due to large span and light dead weight, and the structural form is favored by owners.
The general structure of large tracts of land space rack is complicated, and the installation degree of difficulty is high, and the installation back is striden in the starting, and remaining rack generally takes the method of encorbelmenting the installation to accomplish, and the method that prevents to warp down generally has 2 during the installation, sets up large tracts of land full hall red scaffold frame, except that can prevent the rack from warping down, can also regard as construction operation platform, and the drawback of this method is: the full red scaffold occupies a large area of a construction site for a long time, and the scaffold lease cost is high and uneconomical. Secondly, a downward-warping part is jacked up by using a latticed support similar to a tower crane standard knot to prevent downward warping, the method has the defect that the overall dimension, namely the height, of the manufactured latticed support is a fixed value, and under the condition that the ground elevation of a construction site fluctuates, a base plate or a jack is added to the top of the latticed support to be continuously adjusted according to an actual measured value, so that the method consumes a large amount of steel, labor and construction period.
Disclosure of Invention
Aiming at the defects of the existing high-altitude net rack construction method, the invention provides the large-area net rack high-altitude overhanging installation downwarping prevention construction method which is simple to operate, low in construction cost and high in speed. The specific technical scheme is as follows:
a construction method for preventing downward deflection of high-altitude overhanging installation of a large-area net rack is carried out according to the following steps:
(1) taking the middle two trusses of the net rack as starting spans, and performing first-step construction to finish the installation of the starting spans;
(2) taking the starting span as a reference surface, and installing other overhanging installation spans on two sides in a diffusion mode;
(3) stage one: in the process of cantilever diffusion installation, the deflection of a cantilever installation spanning net rack is monitored, and when about three grids are installed in a diffusion mode, a holding pole is added to serve as a temporary support;
(4) the top of the holding pole is connected with the lower string ball of the net rack through a chain block;
(5) according to the deflection measured value, when the deflection is out of tolerance, pulling the chain block, and gradually adjusting the deflection until the deflection meets the standard requirement;
(6) and a second stage: continuously performing diffusion construction on the two sides to form overhanging installation spans, and loosening the holding rods and removing the inverted chains when the overhanging installation spans are installed on the structural columns;
(7) and a third stage: repeating the steps, continuously diffusing construction cantilever mounting spans to two sides, and adjusting the flexibility of the net rack by using the holding rods removed in the second stage as temporary supports when approximately middle grids are diffused and mounted outwards;
(8) and continuously repeating the steps until the net rack is installed.
Compared with the prior construction, the construction method has the beneficial effects that: the erection of the full-framing scaffold and the occupation of a construction site by a large area and a long time are avoided, and a large amount of lease cost is saved. The manufacturing cost of the lattice type support is avoided, a large amount of steel is saved, and the manufacturing of the lattice type support has a lot of welding operation and labor consumption. The holding poles can be used alternately, the downwarping value is adjusted simply and quickly, and the construction period is shortened.
The temporary holding pole supporting structure specifically comprises the following components: ear plates in four directions are welded at the top of the holding pole, and holes are formed in the ear plates; four 5t inverted chains are arranged on the holding pole, the upper ends of the inverted chains are connected with ear plates at the top of the holding pole, and the lower ends of the inverted chains are connected with lower string balls.
Drawings
FIG. 1: starting to cross a plane;
FIG. 2: 1-1 starting cross-sectional view;
FIG. 3: a state diagram of a cantilever diffusion installation stage I;
FIG. 4: 2-section 2 section one section view;
FIG. 5: a state diagram of a cantilever diffusion installation stage II;
FIG. 6: section two of section 3-3;
FIG. 7: a state diagram of a cantilever diffusion installation stage;
FIG. 8: 4-4 section three section view;
FIG. 9: finishing the cantilever diffusion installation;
FIG. 10: pole embracing drawing structure diagram.
In the figure: 1-starting span, 2-overhanging mounting span, 3-holding pole, 4-inverted chain, 5-structural column, 6-structural column, 7-ear plate and 8-lower string ball.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings as follows: the design concept of the invention is to complete the starting span installation firstly; and then, the starting span is used as a reference surface and is cantilevered and installed to the two sides in an expanding mode. When encorbelmenting the installation to about 3 net, utilize on embracing the pole to embrace the pole and form stable bearing structure, effectively prevent the rack from downwarping.
The construction method of the present invention will be described in detail with reference to the accompanying drawings 1 to 10 and an embodiment of the present invention:
(1) the net rack constructed by the embodiment integrally spans 16 axes, wherein
In the present construction method, the first construction is performed with two net structures located between the eighth axis and the third axis as starting span 1, and the step is installed in a normal net installation manner.
(2) Taking the starting span 1 as a reference surface, installing other cantilever installation spans 2 to the cantilevers at the two sides in a diffusion way, namely installing a structure between the (eighth-seventh) axes at the left side of the starting span and installing the (eighth-seventh) axes at the right side of the starting span
The configuration between the axes.
(3) Stage one: in the diffusion installation of encorbelmenting, stride 2 rack deflections to the installation of encorbelmenting and monitor, when 3 grids of outward diffusion installation, add pole 3 as interim support.
(4) The top of the holding pole 3 is connected with the net rack lower chord ball through the chain block 4; the top of the holding pole 3 is provided with an ear plate, the ear plate is provided with a hole for hanging a chain block 4, one end of the chain block 4 is connected with the ear plate hole, and the other end of the chain block is connected with the net rack lower string ball.
(5) According to the deflection measured value, when the deflection is out of tolerance, pulling the chain block 4 to gradually adjust the deflection until the deflection meets the standard requirement;
(6) and a second stage: continuously installing the overhanging installation span 2 to both sides in a diffused way, and installing the overhanging installation span between the seventh step,
To
When the structure is installed on the structural column 6, the holding pole 3 is loosened and the chain block 4 is removed.
(7) And a third stage: repeating the steps, continuously performing diffusion construction on the two sides to form the cantilever mounting span 2, and temporarily supporting the hanging rods 3 when three grids are outwards diffused and mounted to adjust the flexibility of the net rack;
(8) and continuously repeating the steps until the net rack is installed.
The invention provides a pole support as a temporary support structure to adjust the flexibility of a net rack, which has the following structure: the steel pipe phi 219 x 6 is used as the supporting holding pole 3, ear plates 7 in four directions are welded on the top of the holding pole 3, holes phi 22-phi 24 are formed in the ear plates 7, four 5t chain blocks 4 are arranged on the holding pole 3, the lower end of each chain block 4 is connected with a lower chord ball 8, the upper end of each chain block is connected with the ear plate on the top of the holding pole, and the net frame lower deflection value can be adjusted by pulling the chain blocks according to the measurement result.
The invention avoids the erection of the full red scaffold and the occupation of a large area and a long time of a construction site, and saves a large amount of lease cost. The manufacturing cost of the lattice type support is avoided, a large amount of steel is saved, and the manufacturing of the lattice type support has a lot of welding operation and labor consumption. The holding poles can be used alternately, the downwarping value is adjusted simply and quickly, and the construction period is shortened.
Claims (2)
1. A construction method for preventing downward deflection of high-altitude overhanging installation of a large-area net rack is carried out according to the following steps:
1) taking the middle two trusses of the net rack as starting spans, and performing first-step construction to finish the installation of the starting spans;
2) taking the starting span as a reference surface, and installing other overhanging installation spans on two sides in a diffusion mode;
3) stage one: in the process of cantilever diffusion installation, the deflection of a cantilever installation spanning net rack is monitored, and when three grids are installed in a diffusion mode outwards, a holding pole is added to serve as a temporary support;
4) the top of the holding pole is connected with the lower string ball of the net rack through a chain block;
5) according to the deflection measured value, when the deflection is out of tolerance, pulling the chain block, and gradually adjusting the deflection until the deflection meets the standard requirement;
6) and a second stage: continuously installing overhanging installation spans to the two sides in a diffusion mode, and when the overhanging installation spans are installed on the structural column, loosening the holding rods and removing the inverted chains;
7) and a third stage: repeating the steps, continuously diffusing construction cantilever mounting spans to two sides, and adjusting the flexibility of the net rack by using the holding rods removed in the second stage as temporary supports when three grids are diffused and mounted outwards;
8) and continuously repeating the steps until the net rack is installed.
2. The construction method for preventing the downward deflection of the high-altitude overhanging installation of the large-area net rack as claimed in claim 1 is characterized in that: embrace interim bearing structure of pole specifically and do: ear plates in four directions are welded at the top of the holding pole, and holes are formed in the ear plates; four 5t inverted chains are arranged on the holding pole, the upper ends of the inverted chains are connected with ear plates at the top of the holding pole, and the lower ends of the inverted chains are connected with lower string balls.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910731144.7A CN110424533B (en) | 2019-08-08 | 2019-08-08 | Down-warping-preventing construction method for high-altitude overhanging installation of large-area net rack |
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| CN201910731144.7A CN110424533B (en) | 2019-08-08 | 2019-08-08 | Down-warping-preventing construction method for high-altitude overhanging installation of large-area net rack |
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| CN110424533A CN110424533A (en) | 2019-11-08 |
| CN110424533B true CN110424533B (en) | 2021-03-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5991269A (en) * | 1982-11-16 | 1984-05-25 | 株式会社巴組鐵工所 | Block assembling of three-dimensional structure |
| CN101435224A (en) * | 2008-12-24 | 2009-05-20 | 河南中美铝业有限公司 | High altitude suspension selecting bulk construction method of barrel shell type bolt ball node network frame |
| CN102877547A (en) * | 2012-10-16 | 2013-01-16 | 北京市机械施工有限公司 | Steel net rack installation method for integrally improving high-altitude moving and positioning |
| CN104831939A (en) * | 2015-05-22 | 2015-08-12 | 常州第一建筑集团有限公司 | Bolt ball welding ball mixed node large span cantilever grid structure construction method |
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2019
- 2019-08-08 CN CN201910731144.7A patent/CN110424533B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5991269A (en) * | 1982-11-16 | 1984-05-25 | 株式会社巴組鐵工所 | Block assembling of three-dimensional structure |
| CN101435224A (en) * | 2008-12-24 | 2009-05-20 | 河南中美铝业有限公司 | High altitude suspension selecting bulk construction method of barrel shell type bolt ball node network frame |
| CN102877547A (en) * | 2012-10-16 | 2013-01-16 | 北京市机械施工有限公司 | Steel net rack installation method for integrally improving high-altitude moving and positioning |
| CN104831939A (en) * | 2015-05-22 | 2015-08-12 | 常州第一建筑集团有限公司 | Bolt ball welding ball mixed node large span cantilever grid structure construction method |
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