CN110805138A - Construction method for jacking two sides of large-span net rack - Google Patents
Construction method for jacking two sides of large-span net rack Download PDFInfo
- Publication number
- CN110805138A CN110805138A CN201911195622.3A CN201911195622A CN110805138A CN 110805138 A CN110805138 A CN 110805138A CN 201911195622 A CN201911195622 A CN 201911195622A CN 110805138 A CN110805138 A CN 110805138A
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- net rack
- jacking
- sides
- net
- rack
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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
-
- 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
- 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
- E04B1/3522—Extraordinary methods of construction, e.g. lift-slab, jack-block characterised by raising a structure and then adding structural elements under it
- E04B1/3527—Extraordinary methods of construction, e.g. lift-slab, jack-block characterised by raising a structure and then adding structural elements under it the structure being a roof
Abstract
The invention relates to a construction method for jacking a large-span net rack on two sides. The jacking and assembling process is provided with a plurality of rows of horizontal tensioning cables, and the two sides of the net rack are tensioned towards the middle to control the deformation of the net rack in the jacking process within an allowable range, so that the structural safety of the net rack is ensured. In the jacking process, the net rack is vertically jacked, the jacking device does not need to move for many times in one position, and the common net rack can be assembled through jacking for four times. The construction method has the advantages of low cost, high safety, simple operation, easy realization, small required operation space and higher popularization value.
Description
Technical Field
The invention relates to a net rack construction method, in particular to a bilateral jacking construction method for a large-span net rack.
Background
The construction of large-span rack has always been a difficult problem to each construction unit, because the rack is very big in left and right sides span, in the work progress, the bed-jig single face warp too big be difficult to the adjustment, arouses easily that the size discrepancy is too big, influences structure safety, leads to the quality unqualified. Meanwhile, the vertical height of the middle building part is very high, and the position of the movable jack needs to be adjusted for many times when the unilateral jacking construction method is used, so that the construction efficiency is low, and the cost is high.
Disclosure of Invention
The invention aims to provide a construction method for double-side jacking of a large-span net rack, which aims to solve the problems of high cost, low safety and low efficiency in the construction of the existing large-span net rack.
The invention is realized by the following steps: a construction method for double-side jacking of a large-span net rack comprises the following steps:
a. a row of support frames are arranged on the ground along the length direction of the net rack, and the support frames are positioned in the middle of the span direction of the net rack;
b. a third-layer net rack, a second-layer net rack, a first-layer net rack and a skylight rack are sequentially arranged on the support frame, so that the assembly of the middle parts of the net racks is completed;
c. two sides of the middle part of the net rack are respectively provided with a row of jacking devices;
d. integrally jacking the middle part of the assembled net rack by using a jacking device to enable the middle part of the net rack to be separated from the support frame, and continuously assembling the net rack on two sides of the middle part of the net rack;
e. stopping splicing when two sides of the net rack are about to contact with the ground, and respectively arranging a row of jacking devices on two sides of the newly formed net rack;
f. using a jacking device to continue jacking, and continuing assembling the net rack on two sides of the net rack;
g. moving two rows of jacking devices positioned in the middle to two sides of the newly formed net rack;
h. c, repeating the step f and the step g to continuously lift and assemble the net rack until the whole net rack is completely assembled and lifted in place, and arranging a plurality of rows of tensioning cables with different heights to tension the net racks on the two sides towards the middle in the assembling and lifting process;
I. after the whole net rack is assembled, arranging supports on the ground below the two sides of the net rack, mounting the two sides of the net rack on the supports, adjusting the position of the net rack by using the supports, and fixing the net rack;
j. and removing the jacking device and tensioning the inhaul cable to complete the construction of the large-span net rack.
The tensioning inhaul cables are at least one row, the tensioning inhaul cables are horizontal, and the plurality of rows of tensioning inhaul cables are evenly distributed along the height direction of the net rack.
The jacking device is connected with the second-layer net rack, and the step c can be performed after the second-layer net rack is assembled in the step b.
The invention firstly assembles the middle part of the net rack, then adds a row of jacking devices on the basis of unilateral jacking, the two rows of jacking devices are symmetrically arranged at two sides of the net rack structure, and extend in the span direction of the net rack through repeated upward jacking until the net rack is completely assembled. The jacking and assembling process is provided with a plurality of rows of horizontal tensioning cables, and the two sides of the net rack are tensioned towards the middle to control the deformation of the net rack in the jacking process within an allowable range, so that the structural safety of the net rack is ensured. In the jacking process, the net rack is vertically jacked, the jacking device does not need to move at a position for multiple times to be adjusted, and the common net rack only needs to be assembled through jacking of four times to be completed. When the net frame is assembled, 90% of workload is completed within a height of 10 meters below the ground, so that the construction efficiency can be improved, and the operation risk of workers during construction can be reduced.
The construction method has the advantages of low cost, high safety, simple operation, easy realization, small required operation space and higher popularization value.
Drawings
Fig. 1 is a schematic view of the present invention for setting up a support frame on the ground.
Fig. 2 is a schematic view of a third net mount in the middle of the assembled net mount of the present invention.
Fig. 3 is a schematic view of a second net mount in the middle of the assembled net mount of the present invention.
Fig. 4 is a schematic view showing the installation of jacking devices at both sides of the middle portion of the net rack according to the present invention.
Fig. 5 is a schematic view of a first net mount in the middle of the assembled net mount of the present invention.
Fig. 6 is a schematic view of the assembled skylight frame net rack of the present invention.
Fig. 7 is a schematic view of the first jacking and splicing net racks to both sides according to the present invention.
Fig. 8 is a schematic view of the present invention with two rows of jacking devices added to both sides of the assembled grid.
FIG. 9 is a schematic view of the present invention in which a net rack on both sides is assembled by a second jacking and a first row of tensioning cables is installed.
FIG. 10 is a schematic view of the present invention lifting a net rack with two sides assembled for the third time and installing a second row of tensioning cables.
Fig. 11 is a schematic view of the present invention for fourth jacking and assembling net frames at two sides and fixing the net frames on the supports.
In the figure: 1. a support frame; 2. a third layer of net frame; 3. a second layer of net rack; 4. a jacking device; 5. a first layer of net rack; 6. a skylight frame net rack; 7. tensioning the inhaul cable; 8. and (4) a support.
Detailed Description
As shown in fig. 1 to 11, the construction steps of the present invention include:
a. a row of support frames 1 are arranged on the ground along the length direction of the net rack, and the support frames 1 are positioned in the middle of the span direction of the net rack;
b. a third-layer net rack 2, a second-layer net rack 3, a first-layer net rack 5 and a skylight rack 6 are sequentially arranged on the support frame 1 to complete the assembly of the middle parts of the net racks;
c. two sides of the middle part of the net rack are respectively provided with a row of jacking devices 4;
d. integrally jacking the middle part of the assembled net rack by using a jacking device 4 to ensure that the middle part of the net rack is separated from the support frame 1, and continuously assembling the net rack on two sides of the middle part of the net rack;
e. stopping splicing when two sides of the net rack are about to contact with the ground, and respectively arranging a row of jacking devices 4 on two sides of the newly formed net rack;
f. the jacking device 4 is used for continuing jacking, and the net rack is continuously assembled on the two sides of the net rack;
g. moving two rows of jacking devices 4 positioned in the middle to two sides of the newly formed net rack;
h. c, repeating the step f and the step g to continuously lift and assemble the net rack until the whole net rack is completely assembled and lifted in place, and arranging a plurality of rows of tensioning cables 7 with different heights to tension the net racks on the two sides towards the middle in the assembling and lifting process;
I. after the whole net rack is assembled, arranging supports 8 on the ground below the two sides of the net rack, mounting the two sides of the net rack on the supports 8, adjusting the position of the net rack by using the supports 8, and fixing the net rack;
j. and removing the jacking device 4 and the tensioning cable 7 to complete the construction of the large-span net rack.
The invention starts from the middle to install, firstly determines the left and right spans of the large-scale net rack and the middle position in the span direction according to the construction site, the span of the large-scale net rack is about 100m, and the height of the highest jacking point is about 25 m.
As shown in fig. 1, a temporary scaffold is erected on the ground at the middle portion in the span direction as a support frame 1, and the support frame 1 is provided in a row along the longitudinal direction of the rack. As shown in fig. 2, 3, 5 and 6, a third layer of support of four grids is firstly assembled on a support frame 1, a second layer of net rack 3 is assembled after welding is finished, a first layer of net rack 5 is installed after the second layer of net rack 3 is installed, and then a skylight rack 6 is installed on the first layer of net rack 5, so that the assembly of the middle part of the net rack is finished, wherein the third layer of net rack 2 and the skylight rack 6 need to be hoisted by using a crane.
As shown in fig. 4, two rows of jacking devices 4 are respectively arranged on two sides of the middle part of the net rack, the tops of the jacking devices 4 are contacted with the ball joints of the second-layer net rack 3, and the jacking devices 4 can be arranged after the middle part of the net rack is assembled and can also be arranged after the second-layer net rack 3 is assembled. After the jacking device 4 is installed, the support frame 1 can be removed, and the net rack is supported by the jacking device 4.
As shown in fig. 7, after the middle part of the net rack is assembled and the jacking devices 4 are arranged, the middle part of the net rack is jacked by a certain height by using the jacking devices 4, and then the two sides of the net rack are extended and assembled.
As shown in fig. 8, the extension assembling is stopped until both sides of the net frame are to be in contact with the ground, and then a row of jacking devices 4 are arranged on both sides of the newly formed net frame to prepare for the continuous jacking.
As shown in fig. 9, the net rack is continuously jacked, the two sides of the net rack are extended and assembled until the two sides of the net rack are in contact with the ground, a row of tensioning cables 7 are arranged at the positions close to the ground, the two ends of each tensioning cable 7 are respectively connected with the two sides of the net rack in the opposite directions, and the two sides of the net rack are tensioned towards the middle through the tensioning cables 7, so that the phenomenon that the two sides of the net rack are outwards expanded due to the deformation of the net rack under the action of gravity is prevented. At the same time, the two rows of jacking devices 4 in the middle are detached and moved to the two sides of the newly formed net rack to prepare for continuous jacking. The tension cable 7 is a wire rope having a sufficiently high tensile strength.
As shown in fig. 10, the net rack is continuously jacked, the two sides of the net rack are extended and assembled until the two sides of the net rack are in contact with the ground, a row of tensioning cables 7 are arranged at the positions close to the ground, the two ends of each tensioning cable 7 are connected with the two sides of the net rack respectively, the two sides of the net rack are tensioned towards the middle through the tensioning force of each tensioning cable 7, and therefore the phenomenon that the two sides of the net rack are outwards expanded due to the deformation of the net rack under the action of gravity is prevented. At the same time, the two rows of jacking devices 4 in the middle are detached and moved to the two sides of the newly formed net rack to prepare for continuous jacking.
As shown in fig. 11, two rows of jacking devices 4 in the middle are removed, only the jacking devices 4 on two sides are used for jacking, the two sides of the net rack are extended and assembled until the two sides of the net rack are in contact with the ground, a row of supports 8 are respectively fixed on the ground on the two sides of the net rack, the two sides of the net rack are respectively installed on the supports 8, the position of the net rack is finally adjusted through the supports 8, and after the adjustment is finished, the net rack is fixed on the supports 8. After the net rack is fixed, the jacking device 4 and the tensioning cable 7 are removed, and the construction of the whole large-span net rack is completed.
Compared with the existing single-side jacking method, the method has the advantages that the number of the jacking devices 4 is not increased, the jacking devices 4 are not inclined in the jacking process, the position adjustment is not needed, the jacking time is greatly saved, and the construction period is favorably shortened. Use tensioning cable 7 to take up the rack, the spatial grid structure warp for a short time, and easy adjustment control satisfies the design requirement. Meanwhile, due to bilateral jacking, the net racks can be assembled from the two sides of the net racks simultaneously, the working face is doubled, and the construction progress is faster.
Claims (3)
1. A construction method for jacking two sides of a large-span net rack is characterized by comprising the following steps:
a. a row of support frames are arranged on the ground along the length direction of the net rack, and the support frames are positioned in the middle of the span direction of the net rack;
b. a third-layer net rack, a second-layer net rack, a first-layer net rack and a skylight rack are sequentially arranged on the support frame, so that the assembly of the middle parts of the net racks is completed;
c. two sides of the middle part of the net rack are respectively provided with a row of jacking devices;
d. integrally jacking the middle part of the assembled net rack by using a jacking device to enable the middle part of the net rack to be separated from the support frame, and continuously assembling the net rack on two sides of the middle part of the net rack;
e. stopping splicing when two sides of the net rack are about to contact with the ground, and respectively arranging a row of jacking devices on two sides of the newly formed net rack;
f. using a jacking device to continue jacking, and continuing assembling the net rack on two sides of the net rack;
g. moving two rows of jacking devices positioned in the middle to two sides of the newly formed net rack;
h. c, repeating the step f and the step g to continuously lift and assemble the net rack until the whole net rack is completely assembled and lifted in place, and arranging a plurality of rows of tensioning cables with different heights to tension the net racks on the two sides towards the middle in the assembling and lifting process;
I. after the whole net rack is assembled, arranging supports on the ground below the two sides of the net rack, mounting the two sides of the net rack on the supports, adjusting the position of the net rack by using the supports, and fixing the net rack;
j. and removing the jacking device and tensioning the inhaul cable to complete the construction of the large-span net rack.
2. The construction method for bilateral jacking of the large-span net rack according to claim 1, wherein the tension cables are at least one row, the tension cables are horizontal, and the tension cables are uniformly distributed in the height direction of the net rack.
3. The construction method for bilaterally jacking a large-span net rack according to claim 1, wherein the jacking device is connected with a second-layer net rack, and the step c can be performed after the second-layer net rack is assembled in the step b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911195622.3A CN110805138B (en) | 2019-11-29 | 2019-11-29 | Construction method for jacking two sides of large-span net rack |
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| CN201911195622.3A CN110805138B (en) | 2019-11-29 | 2019-11-29 | Construction method for jacking two sides of large-span net rack |
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| CN110805138A true CN110805138A (en) | 2020-02-18 |
| CN110805138B CN110805138B (en) | 2021-08-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111502027A (en) * | 2020-05-19 | 2020-08-07 | 中国二十冶集团有限公司 | Inverted cone jacking method for large-span grid structure |
| CN111980165A (en) * | 2020-08-07 | 2020-11-24 | 中建八局第二建设有限公司 | Large-span net rack external-expanding splicing integral jacking construction method |
| CN113123469A (en) * | 2021-03-24 | 2021-07-16 | 中国五冶集团有限公司 | Method for constructing complex curved surface modeling roof grid structure |
| CN113756504A (en) * | 2021-09-30 | 2021-12-07 | 北京建工集团有限责任公司 | Right-angle latticed shell with external corners and construction method thereof |
| CN114922435A (en) * | 2022-05-17 | 2022-08-19 | 山东电力工程咨询院有限公司 | Construction method of bolt-sphere joint net rack of garbage power station |
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| CN110093985A (en) * | 2019-05-20 | 2019-08-06 | 中国二十冶集团有限公司 | A kind of jacking apparatus and method is extended out using the unilateral jacking of rack of the device |
| CN110185151A (en) * | 2019-05-22 | 2019-08-30 | 三箭建设工程集团有限公司 | More hydraulic device synchronization of jacking up construction methods of wide span steel roof frame |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111502027A (en) * | 2020-05-19 | 2020-08-07 | 中国二十冶集团有限公司 | Inverted cone jacking method for large-span grid structure |
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| CN111980165A (en) * | 2020-08-07 | 2020-11-24 | 中建八局第二建设有限公司 | Large-span net rack external-expanding splicing integral jacking construction method |
| CN113123469A (en) * | 2021-03-24 | 2021-07-16 | 中国五冶集团有限公司 | Method for constructing complex curved surface modeling roof grid structure |
| CN113756504A (en) * | 2021-09-30 | 2021-12-07 | 北京建工集团有限责任公司 | Right-angle latticed shell with external corners and construction method thereof |
| CN114922435A (en) * | 2022-05-17 | 2022-08-19 | 山东电力工程咨询院有限公司 | Construction method of bolt-sphere joint net rack of garbage power station |
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