CN117569609A - Integral hoisting construction method for large-span beam string - Google Patents
Integral hoisting construction method for large-span beam string Download PDFInfo
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- CN117569609A CN117569609A CN202311565848.4A CN202311565848A CN117569609A CN 117569609 A CN117569609 A CN 117569609A CN 202311565848 A CN202311565848 A CN 202311565848A CN 117569609 A CN117569609 A CN 117569609A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004660 morphological change Effects 0.000 description 2
- 241001139947 Mida Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to the technical field of building construction, in particular to a construction method for integrally hoisting a large-span beam string, which comprises the following steps: the main steel girder is spliced without stress; the lower chord Gao Fansuo is installed; installing a tensioning device at the tensioning end, and initially tensioning the high-vanadium cable, wherein one end tensioning is adopted for tensioning until the designed initial tensioning value is reached; hoisting the beam string; and (3) carrying out secondary tensioning after all the primary and secondary beams of the roof structure are installed, wherein the tensioning of the inhaul cable adopts double control, namely, the tension and elongation values of the inhaul cable are controlled, the deformation observation is enhanced in the tensioning process, and the safety and controllability of the construction process are ensured. The method has the advantages that partial prestress is formed by initial tensioning of the high-vanadium cable, so that the beam string is in a stable state in a plane in the hoisting process, a span auxiliary support is not required, the operability is high, the construction is convenient, safe and stable, economical and reasonable, and the method has popularization value in the construction of the large-span beam string.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an integral hoisting construction method for a large-span beam string.
Background
Along with the economic development of China, the construction industry has achieved remarkable achievement, and particularly in recent years, the large-span space structure is widely applied to public buildings, such as buildings of airports, high-speed rail station houses, gymnasiums and the like, has good application effects, and mainly comprises truss structures, net frame structures, net shell structures, membrane structures, suspension cable structures, shell structures, and beam string structures, wherein the beam string is in a light large-span structure form and consists of steel beams, stay bars and high-strength guys, has light dead weight and good overall stability, and can be used for the large-span space structure. The traditional construction method of the beam string structure is to set up a temporary support system for hoisting in sections, the temporary support system needs to use a large amount of steel materials, the construction process is inconvenient to organize, the setting-up and disassembling procedures of the temporary support system can have adverse effects on the whole construction period, and the construction cost is potentially increased. In view of the above, we propose a construction method for integral hoisting of a large-span beam string.
Disclosure of Invention
The invention aims to provide a construction method for integrally hoisting a large-span beam string, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the construction method for integrally hoisting the large-span beam string comprises the following steps of:
step 1: main girder steel stress-free assembly
An assembly platform is arranged on the outer side of a building, the ground assembly of the upper chord girder is carried out, the installation position of an interface is controlled through the measurement of a ground sample line and an elevation, the three-dimensional coordinates of the corner points of the port cross section of the assembled section are measured and rechecked through a total station after the adjustment and the positioning are carried out, the butt joint welding is carried out after the inspection is carried out without errors, and the stress-free assembly of the main girder is completed;
step 2: lower chord Gao Fansuo mount
The temporary support system is erected, the assembled and qualified upper chord main beams can be lifted to the temporary support system after the temporary support system is erected, then a supporting rod is installed, and the lower chord Gao Fansuo is installed in place by using a cable releasing device and an automobile crane after the assembly is completed;
step 3: initial stretching
Installing a tensioning device at the tensioning end, and initially tensioning the high-vanadium cable, wherein one end tensioning is adopted for tensioning until the designed initial tensioning value is reached;
step 4: beam string hoisting device
Hoisting the whole beam string beams to a designed position by using a large hoisting machine, correcting and reinforcing, sequentially installing partial secondary beams among the beam string beams, strengthening the overall stability, unhooking, and performing linear observation after unhooking to ensure the overall linear essence for the installation of the beam string beams;
step 5:
repeating the steps 1-4 until all the beam string beams are hoisted in place;
step 6: secondary stretching
And after all the primary beams and the secondary beams of the roof structure are installed, carrying out secondary tensioning, wherein the tensioning of the inhaul cable adopts double control, namely, the tension and the elongation value of the inhaul cable are controlled, the deformation observation is enhanced in the tensioning process, and the safety and the controllability of the construction process are ensured.
Preferably, in the step 3, partial prestress is formed by initial tensioning of the high-vanadium cable, so that the beam string is in a stable state in a plane in the hoisting process, and a midspan auxiliary support is not required.
Preferably, in the step 2, the temporary support system for the initial tensioning of the ground comprises a support and a movable steel beam, wherein the height of the support is larger than Shanzhang chord Liang Quangao, and the movable steel beam can ensure that the beam string can be quickly separated from the support in the hoisting process.
Preferably, in step 3, the span chords are initially tensioned by a tensioning device, and the tensioning device is suitable for tensioning the prestressed cable of the span chords.
Preferably, before the step 1, space finite element analysis of the beam string is performed by using engineering software, morphological changes in the construction process of the beam string are simulated and analyzed, and the hierarchical tension value of the inhaul cable is determined.
Compared with the prior art, the invention has the beneficial effects that: the construction method for integrally hoisting the large-span beam string is reasonable in design on a stress system, and forms prestress after the primary tension of the inhaul cable, so that the stability in the plane of the structure of the cable beam is ensured, and the bending resistance and the crossing capacity of the single beam string are effectively improved; compared with the traditional beam string installation technology, the invention saves the temporary support required by sectional hoisting, reduces the investment of materials and manpower and obviously reduces the engineering cost; meanwhile, the invention saves the construction period: compared with the traditional beam string installation technology, the installation and dismantling procedures of using temporary brackets during the installation of the beam string are reduced, the construction efficiency is obviously improved, and the construction period is saved; in addition, the invention is safe and reliable, the whole beam string is spliced and welded on the ground, the time of high-altitude operation is reduced, and the safety risk caused by the high-altitude operation is greatly reduced; further, the invention is energy-saving and environment-friendly: compared with the prior art, a large number of temporary support mounting and dismounting operations are not needed, the occupation of construction sites below the steel roof is reduced, construction resources are saved, and the method is environment-friendly.
Drawings
FIG. 1 is a schematic diagram of an elevational arrangement of the system of the present invention.
Fig. 2 is a view showing the construction of a temporary stent according to the present invention.
Fig. 3 is a front view of the tensioning device of the present invention.
In the figure: 1. an embedded part; 2. a beam string girder; 3. a temporary support; 4. a movable steel beam; 5. a tensioning device; 6. a nut; 7. a reaction frame; 8. u-shaped buckles; 9. a cable head; 10. a tension rod; 11. a bearing frame; 12. a jack; 13. a nut; 21. a guy cable; 22. a brace rod; 31. a section steel connector; 41. and (5) installing a bolt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.
The construction method for integrally hoisting the large-span beam string comprises the following steps of:
step 1: main girder steel stress-free assembly
An assembly platform is arranged on the outer side of a building, the ground assembly of the upper chord girder is carried out, the installation position of an interface is controlled through the measurement of a ground sample line and an elevation, the three-dimensional coordinates of the corner points of the port cross section of the assembled section are measured and rechecked through a total station after the adjustment and the positioning are carried out, the butt joint welding is carried out after the inspection is carried out without errors, and the stress-free assembly of the main girder is completed;
step 2: lower chord Gao Fansuo mount
The temporary support system is erected, the assembled and qualified upper chord main beams can be lifted to the temporary support system after the temporary support system is erected, then a supporting rod is installed, and the lower chord Gao Fansuo is installed in place by using a cable releasing device and an automobile crane after the assembly is completed;
step 3: initial stretching
Installing a tensioning device at the tensioning end, and initially tensioning the high-vanadium cable, wherein one end tensioning is adopted for tensioning until the designed initial tensioning value is reached;
step 4: beam string hoisting device
Hoisting the whole beam string beams to a designed position by using a large hoisting machine, correcting and reinforcing, sequentially installing partial secondary beams among the beam string beams, strengthening the overall stability, unhooking, and performing linear observation after unhooking to ensure the overall linear essence for the installation of the beam string beams;
step 5:
repeating the steps 1-4 until all the beam string beams are hoisted in place;
step 6: secondary stretching
And after all the primary beams and the secondary beams of the roof structure are installed, carrying out secondary tensioning, wherein the tensioning of the inhaul cable adopts double control, namely, the tension and the elongation value of the inhaul cable are controlled, the deformation observation is enhanced in the tensioning process, and the safety and the controllability of the construction process are ensured.
In step 3, partial prestress is formed by initial tensioning of the high-vanadium cable, so that the string beam is in a stable state in a plane in the hoisting process, and a midspan auxiliary support is not required.
Specifically, in step 2, the ground initial tensioning temporary support system comprises a support and a movable steel beam, wherein the support is higher than Shanzhang chord Liang Quangao, and the movable steel beam can ensure that the beam string can be quickly separated from the support in the hoisting process.
In addition, in the step 3, each span chord is initially tensioned by a tensioning device, and the tensioning device is suitable for tensioning the prestressed cable of the span chord.
Furthermore, before step 1, the space finite element analysis of the beam string is performed by using engineering software (such as SAP2000, midas and other engineering software), the morphological change of the beam string in the construction process is simulated and analyzed, and the hierarchical tension value of the inhaul cable is determined.
In a specific embodiment, see fig. 1-3 for details, including temporary support 3 and tensioning device 5, be provided with movable girder steel 4 on the support 3, threaded connection has mounting bolt 41 on the movable girder steel 4, fixedly connected with auxiliary rod 42 on the outer wall of support 3, fixedly connected with base pole 43 on the bottom outer wall of support 3, be provided with vice supporting component 44 on the support 3, the quantity of support 3 is three, three support 3 is the linear arrangement on the string roof beam main part 2, and buries 1 fixed connection is on the bottom outer wall of support 3, and buries 1's quantity is twelve, four buries 1 are a set of bottoms that set up at support 3, make buries 1 can be stable support 3 through setting up a plurality of buries 1. The tensioning device 5 comprises a jack 12, a tensioning rod 10, a nut 13, a bearing frame 11, a counter-force frame 7, a U-shaped buckle 8 and a gasket, wherein the bearing frame is detachably connected to a cable on the outer side of the cable head, and the cable is fixedly connected to the cable through a connecting lug plate by using a bolt. The tension rod 10 is connected with the jack 12 through two through holes on the bearing frame 11, the number of the tension rod 2 is two, the jack 12 acts on the bearing frame, the other end of the tension rod is connected with the detachable counter-force frame 7 through the M25 nut 13, the counter-force frame 7 is two, the two counter-force frames are arranged symmetrically up and down, the end part of the U-shaped buckle 8 penetrates through the counter-force frame and is connected with the counter-force frame 7 through the M30 nut 6, the jack 4 reversely pushes the upper nut 13 of the tension rod 2, the tension rod passively acts on the counter-force frame, acts on the cable anchoring end through the U-shaped buckle 8, and meanwhile, in order to ensure that the surface coating of the anchor is not damaged in the city of the tensioning process, a gasket is additionally arranged between the U-shaped buckle and the contact surface of the anchor end lug plate for protection.
When the method is used for carrying out integral hoisting construction on the large-span beam string, partial prestress is formed by initial tensioning of the high-vanadium cable, so that the beam string is in a stable state in a plane in the hoisting process, a mid-span auxiliary support is not required to be arranged, the operability is high, the construction is convenient, safe and stable, the economy and the rationality are realized, and the method has popularization value in the construction of the large-span beam string.
Therefore, the invention has reasonable design on a stress system, forms prestress after the primary stretching of the inhaul cable, ensures the stability of the cable-beam structure in the plane, and effectively improves the bending resistance and the crossing capacity of the single-beam string beam; compared with the traditional beam string installation technology, the invention saves the temporary support required by sectional hoisting, reduces the investment of materials and manpower and obviously reduces the engineering cost; meanwhile, the invention saves the construction period: compared with the traditional beam string installation technology, the installation and dismantling procedures of using temporary brackets during the installation of the beam string are reduced, the construction efficiency is obviously improved, and the construction period is saved; in addition, the invention is safe and reliable, the whole beam string is spliced and welded on the ground, the time of high-altitude operation is reduced, and the safety risk caused by the high-altitude operation is greatly reduced; further, the invention is energy-saving and environment-friendly: compared with the prior art, a large number of temporary support mounting and dismounting operations are not needed, the occupation of construction sites below the steel roof is reduced, construction resources are saved, and the method is environment-friendly.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The construction method for integrally hoisting the large-span beam string is characterized by comprising the following steps of:
step 1: main girder steel stress-free assembly
An assembly platform is arranged on the outer side of a building, the ground assembly of the upper chord girder is carried out, the installation position of an interface is controlled through the measurement of a ground sample line and an elevation, the three-dimensional coordinates of the corner points of the port cross section of the assembled section are measured and rechecked through a total station after the adjustment and the positioning are carried out, the butt joint welding is carried out after the inspection is carried out without errors, and the stress-free assembly of the main girder is completed;
step 2: lower chord Gao Fansuo mount
The temporary support system is erected, the assembled and qualified upper chord main beams can be lifted to the temporary support system after the temporary support system is erected, then a supporting rod is installed, and the lower chord Gao Fansuo is installed in place by using a cable releasing device and an automobile crane after the assembly is completed;
step 3: initial stretching
Installing a tensioning device at the tensioning end, and initially tensioning the high-vanadium cable, wherein one end tensioning is adopted for tensioning until the designed initial tensioning value is reached;
step 4: beam string hoisting device
Hoisting the whole beam string beams to a designed position by using a large hoisting machine, correcting and reinforcing, sequentially installing partial secondary beams among the beam string beams, strengthening the overall stability, unhooking, and performing linear observation after unhooking to ensure the overall linear essence for the installation of the beam string beams;
step 5:
repeating the steps 1-4 until all the beam string beams are hoisted in place;
step 6: secondary stretching
And after all the primary beams and the secondary beams of the roof structure are installed, carrying out secondary tensioning, wherein the tensioning of the inhaul cable adopts double control, namely, the tension and the elongation value of the inhaul cable are controlled, the deformation observation is enhanced in the tensioning process, and the safety and the controllability of the construction process are ensured.
2. The construction method for integrally hoisting a large-span beam string according to claim 1, wherein the construction method comprises the following steps: in the step 3, partial prestress is formed by initial tensioning of the high-vanadium cable, so that the string beam is in a stable state in a plane in the hoisting process, and a midspan auxiliary support is not required.
3. The construction method for integrally hoisting a large-span beam string according to claim 1, wherein the construction method comprises the following steps: in step 2, the ground initial tensioning temporary support system comprises a support and a movable steel beam, wherein the support is higher than Shanzhang chord Liang Quangao, and the movable steel beam can ensure that the chord beam can be quickly separated from the support in the hoisting process.
4. The construction method for integrally hoisting a large-span beam string according to claim 1, wherein the construction method comprises the following steps: in the step 3, each span chord is initially tensioned by a tensioning device, and the tensioning device is suitable for tensioning the prestressed cable of the span chord.
5. The construction method for integrally hoisting a large-span beam string according to claim 1, wherein the construction method comprises the following steps: before step 1, carrying out space finite element analysis on the beam string by using engineering software, simulating and analyzing the form change of the beam string in the construction process, and determining the hierarchical tension value of the inhaul cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311565848.4A CN117569609A (en) | 2023-11-22 | 2023-11-22 | Integral hoisting construction method for large-span beam string |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311565848.4A CN117569609A (en) | 2023-11-22 | 2023-11-22 | Integral hoisting construction method for large-span beam string |
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| CN117569609A true CN117569609A (en) | 2024-02-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117868555A (en) * | 2024-03-12 | 2024-04-12 | 北京工业大学 | Stay cable prestress compensation device and installation method thereof |
| CN117868555B (en) * | 2024-03-12 | 2024-05-28 | 北京工业大学 | Stay cable prestress compensation device and installation method thereof |
-
2023
- 2023-11-22 CN CN202311565848.4A patent/CN117569609A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117868555A (en) * | 2024-03-12 | 2024-04-12 | 北京工业大学 | Stay cable prestress compensation device and installation method thereof |
| CN117868555B (en) * | 2024-03-12 | 2024-05-28 | 北京工业大学 | Stay cable prestress compensation device and installation method thereof |
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