CN111719705A - Large-span net rack jacking construction process - Google Patents
Large-span net rack jacking construction process Download PDFInfo
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- CN111719705A CN111719705A CN202010609829.7A CN202010609829A CN111719705A CN 111719705 A CN111719705 A CN 111719705A CN 202010609829 A CN202010609829 A CN 202010609829A CN 111719705 A CN111719705 A CN 111719705A
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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
- E04B1/3511—Lift-slab; characterised by a purely vertical lifting of floors or roofs or parts thereof
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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
- E04G21/163—Jacks specially adapted for working-up building 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
- E04B2001/3588—Extraordinary methods of construction, e.g. lift-slab, jack-block using special lifting or handling devices, e.g. gantries, overhead conveying rails
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The application relates to a large-span net rack jacking construction process, which comprises the following steps of calculating jacking quantity and jacking positions; assembling the net racks; installing a jacking device; reinforcing the floor slab; jacking a net rack, starting a hydraulic pump to enable a piston rod of a hydraulic oil cylinder to synchronously rise for a stroke, installing a second standard joint above the first standard joint, enabling a cylinder body of the hydraulic oil cylinder to rise by returning oil of the hydraulic pump, moving a cross beam to the second standard joint to complete a stroke, repeating the step of jacking the net rack to enable the net rack to rise to be 10-20cm above the designed elevation, and stopping jacking; and (4) unloading and installing, so that the hydraulic oil cylinder synchronously descends to drive the net rack to fall on a preset installation seat, and the jacking construction is completed. The method has the effects of shortening the construction period and improving the installation quality and the construction safety.
Description
Technical Field
The application relates to the field of net rack construction, in particular to a large-span net rack jacking construction process.
Background
At present, the building industry develops very rapidly, and buildings with large span spaces are formed in succession and are not few landmark buildings in regions. In the aspect of large-span space structure, the net rack and the net shell are most representative, the net rack is mainly used in buildings such as large stadiums, large exhibition centers, factory buildings and the like, the biggest characteristic of the buildings is that the span is large, the middle part is generally provided with few or no supporting system, so that the wide space can be provided to the utmost extent, the using units can be divided at any time according to the using requirements in the future, the using change is flexible and the obstacles are few, wherein, the steel structure net rack has the advantages of high strength, light weight, good anti-seismic performance, high construction speed, attractive appearance and the like.
In the related technology, the installation method of the steel structure net rack comprises a high-altitude bulk installation method, a block installation method, a strip installation method, a sliding method, an integral lifting method and the like. Wherein, the high-altitude bulk method can only be used for the bolt ball net rack; a temporary operation platform needs to be set up at the butt joint position of the splitting and block mounting method, so that the measure cost is high; the sliding method needs to set up an operation platform and a sliding track for starting, and the measure cost and the construction period are long; the whole lifting method needs to manufacture a lifting frame aiming at each project, the turnover of the lifting frame is poor, and the measure cost is high. In addition, the internal stress control of the rod piece is difficult during the installation in the installation method of the steel structure net rack, and the installation difficulty is high.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: for the steel net rack engineering located in the middle of the whole building group, large-scale hoisting equipment is difficult to approach for use due to the limitation of narrow places, the high-altitude in-situ assembling difficulty of the steel net rack is large, the assembling precision is difficult to guarantee, and due to the cross operation with civil engineering, when a full scaffold is difficult to be erected below the steel net rack to serve as an operation platform, the operation condition is poor, and the installation quality and the construction safety are difficult to be considered within a short construction period.
Disclosure of Invention
In order to improve the problem that the jacking of the net rack is difficult to take into account the construction period, the installation quality and the construction safety, the application provides a large-span net rack jacking construction process.
The application provides a large-span rack jacking construction technology adopts following technical scheme:
the large-span net rack jacking construction process includes the following steps,
calculating the jacking quantity and positions, carrying out stress analysis calculation on the grid structure model, and selecting the quantity and positions of jacking points;
assembling the net racks, namely integrally assembling the net racks on the upper surface of the second floor, wherein the net racks gradually extend from the middle to the periphery, and horizontal supporting points are arranged below the net racks;
installing a jacking device, installing the jacking device on the upper surface of the second floor according to a preset jacking point position, wherein the jacking device is positioned under a ball joint to be jacked, laying a base plate between the jacking device and the upper surface of the second floor, and adjusting the position of the jacking device to enable the central line of the jacking device to be vertically aligned with the center of the ball joint to be jacked;
the jacking device comprises a supporting mechanism, a hydraulic mechanism and a control mechanism, wherein the supporting mechanism comprises a plurality of standard sections which are stacked, a connecting assembly for connecting the standard sections and a cross beam; the hydraulic mechanism comprises a hydraulic oil cylinder, a hydraulic pump, a hydraulic control valve, an upper support frame and a lower support frame, the hydraulic oil cylinder is vertically arranged in the standard joint, a cylinder body of the hydraulic oil cylinder is fixedly connected with the lower support frame, the cross beam is positioned between the lower support frame and the bottom of the standard joint, a piston rod of the hydraulic oil cylinder is fixedly connected with the upper support frame, and a support used for jacking a ball joint is fixedly connected to the upper support frame; the control mechanism is connected to the hydraulic oil cylinder through a hydraulic control valve;
reinforcing the floor slab, paying off the jacking point to the ground of the first floor according to the projection position, tamping a soil layer of the ground of the first floor, paving a supporting plate on the upper surface of the soil layer, installing a reinforcing frame between the supporting plate and the floor slab of the second floor, and knocking the top ends of the reinforcing frame oppositely by steel wedges to enable the steel wedges to be tightly attached to the lower surface of the floor slab of the second floor;
jacking a net rack, starting a hydraulic pump to enable a piston rod of a hydraulic oil cylinder to synchronously rise for a stroke, installing a second standard joint above the first standard joint, enabling a cylinder body of the hydraulic oil cylinder to rise by returning oil of the hydraulic pump, moving a cross beam to the second standard joint to complete a stroke, repeating the step of jacking the net rack to enable the net rack to rise to be 10-20cm above the designed elevation, and stopping jacking;
and (4) unloading and installing, so that the hydraulic oil cylinder synchronously descends to drive the net rack to fall on a preset installation seat, and the jacking construction is completed.
Through adopting above-mentioned technical scheme, the rack is assembled at the floor and for general high altitude assembly, reduces subsidiary platform and sets up, and the human input is few, and the efficiency of construction is high. Construct the accessory transportation distance short, convenient and fast, machinery handling member frequency and time reduce, only need perpendicular transportation machinery handling material to operation face can, need not long-time handling cooperation installation, assemble the progress fast, shorten construction cycle.
Before the whole jacking, carry out whole acceptance inspection to the rack of piecing together, check and detect quality such as piecing together bolt ball node connection, high strength bolt fastening, fire prevention coating, the quality is easily controlled, also can in time clear up dirt, deposition, earth on the component.
The standard knot can quick assembly disassembly, and before whole jacking, the grid structure is assembled at first, except that the member of being connected fixedly with the major structure built-in fitting assemble at the installation normal position, all the other members, bolt ball are all assembled on the floor, need not to set up starting operation platform, have reduced the high altitude construction time by a wide margin, have reduced the safe risk that the grid was assembled.
Preferably, the control mechanism comprises a controller and a pull rope displacement sensor, the pull rope displacement sensor comprises a shell and a steel wire rope, the shell is fixedly connected with the upper support frame, the steel wire rope is fixedly connected with the lower support frame, the pull rope displacement sensor is electrically connected with the controller, and the controller is electrically connected with the hydraulic control valve.
Through adopting above-mentioned technical scheme, stay cord displacement sensor can detect hydraulic cylinder's jacking height, feeds back to the controller, and the controller passes through control hydraulic control valve to control hydraulic cylinder work guarantees that stable synchronous promotion of grid structure does not take place to warp, process safe and reliable in the jacking process.
Preferably, the standard section comprises a connecting plate, an upper angle steel, a lower angle steel, an oblique angle steel, an ear plate and two symmetrically arranged standard frames, each standard frame comprises two parallel upright columns, two parallel cross rods and a plurality of reinforcing rods, two ends of each cross rod are respectively and fixedly connected with the two upright columns, two ends of each reinforcing rod are respectively and fixedly connected with the two cross rods, the connecting plate is fixedly connected with two ends of each upright column, and the ear plate is fixedly connected with two ends of each upright column;
go up the both ends of angle steel and can dismantle with the otic placode of two stand upper ends and be connected, the both ends of angle steel can dismantle with the otic placode of two stand lower extremes and be connected down, oblique angle steel slope sets up and can dismantle with the otic placode and be connected, adjacent two the connection can be dismantled to the connecting plate of standard festival.
Through adopting above-mentioned technical scheme, because the standard festival is detachable structure, not only structural strength is high, makes things convenient for quick assembly disassembly moreover, is favorable to continuous jacking operation, improves the efficiency of construction, shortens construction cycle.
Preferably, the support comprises a pipe body and a positioning plate, the pipe body and the hydraulic oil cylinder are coaxially arranged, one end of the pipe body is fixedly connected with the upper support frame, the positioning plate is connected with the outer wall of one end, close to the notch, of the pipe body, the positioning plate is arranged to be distributed in a plurality of modes and distributed at equal intervals along the circumferential direction of the pipe body, and notches matched with the spherical nodes are formed in the ends, far away from the upper support frame, of the pipe body and the positioning plate.
Through adopting above-mentioned technical scheme, body and locating plate cooperation are fixed a position the ball joint of rack to improve jacking stability and accuracy, improve the jacking quality.
Preferably, the concrete steps of assembling the net rack include that a plurality of horizontal supporting points are arranged below the net rack, a lower chord ball is installed, a lower chord is connected, a web member and an upper chord ball are installed, the assembled upper chord ball and web member triangular cone are connected to a lower chord layer, the upper chord member and the web member are installed, two layers of grids are installed into basic units, and the basic units are expanded until the net rack is assembled.
By adopting the technical scheme, the net rack assembly is carried out on the floor slab, a starting operation platform does not need to be erected, the high-altitude operation time is greatly reduced, and the safety risk of net rack assembly is reduced.
Preferably, in the step of jacking the net rack, after the hydraulic pumps are started, when the rising height difference of each hydraulic oil cylinder is within 10mm, each hydraulic oil cylinder keeps rising; when the rising height difference of each hydraulic oil cylinder is larger than 10mm, the hydraulic oil cylinder larger than 10mm stops working until the height difference is smaller than 10mm, and the hydraulic oil cylinder rises again.
By adopting the technical scheme, the numerical difference of the ascending or descending of the piston rods of all the hydraulic oil cylinders is controlled within a set range, so that the jacked net rack synchronously ascends, the stable and synchronous lifting of the net rack structure in the jacking process is ensured, the deformation is avoided, and the process is safe and reliable.
Preferably, in the step of jacking the net rack, when the jacking height of the net rack is more than 3m, a wind cable is additionally arranged, one end of the wind cable is connected with the standard knot, and the other end of the wind cable is connected with the building structure.
Through adopting above-mentioned technical scheme, the cable wind rope can reduce the influence that wind-force caused to the rack jacking, improves the stability and the security of jacking work.
Preferably, in the step of jacking the net rack, the height of one stroke of the hydraulic oil cylinder is 750-1000 mm.
By adopting the technical scheme, the stroke of the hydraulic oil cylinder is too small, the frequency of dismounting standard joints is too high, the construction period is long, the stroke of the hydraulic oil cylinder is too large, the stress of a piston rod of the hydraulic oil cylinder is unstable, and therefore, the construction period and the construction safety can be considered within the stroke height range.
In summary, the present application includes at least one of the following beneficial technical effects:
1. compared with general high-altitude assembly, the net frame assembly on the floor reduces the erection of an auxiliary platform, and has the advantages of less manpower investment and high construction efficiency. Construct the accessory transportation distance short, convenient and fast, machinery handling member frequency and time reduce, only need perpendicular transportation machinery handling material to operation face can, need not long-time handling cooperation installation, assemble the progress fast, shorten construction cycle.
2. Before the whole jacking, carry out whole acceptance inspection to the rack of piecing together, check and detect quality such as piecing together bolt ball node connection, high strength bolt fastening, fire prevention coating, the quality is easily controlled, also can in time clear up dirt, deposition, earth on the component.
3. The standard knot can quick assembly disassembly, and before whole jacking, the grid structure is assembled at first, except that the member of being connected fixedly with the major structure built-in fitting assemble at the installation normal position, all the other members, bolt ball are all assembled on the floor, need not to set up starting operation platform, have reduced the high altitude construction time by a wide margin, have reduced the safe risk that the grid was assembled.
Drawings
FIG. 1 is a side view of the jacking state of the large-span net rack jacking construction process according to the embodiment of the application;
FIG. 2 is a front view of the jacking state of the large-span net rack jacking construction process according to the embodiment of the present application;
FIG. 3 is a perspective view of a support mechanism of the large-span net rack jacking construction process according to the embodiment of the present application;
FIG. 4 is a perspective view of a hydraulic cylinder, an upper support frame, a lower support frame, a support and a control mechanism of the large-span net rack jacking construction process according to the embodiment of the application;
fig. 5 is a perspective view of a hydraulic pump, a hydraulic control valve, and a controller in the large-span net rack jacking construction process according to the embodiment of the present application.
Description of reference numerals: 1. a net frame; 2. a floor slab; 3. a base plate; 4. a support mechanism; 41. a standard section; 411. a connecting plate; 412. upper angle steel; 413. lower angle steel; 414. oblique angle steel; 415. an ear plate; 416. a standard frame; 4161. a column; 4162. a cross bar; 4163. a reinforcing bar; 42. a connecting assembly; 43. a cross beam; 5. a hydraulic mechanism; 51. a hydraulic cylinder; 52. a hydraulic pump; 53. a hydraulic control valve; 54. an upper support frame; 55. a lower support frame; 6. a control mechanism; 61. a controller; 62. a pull rope displacement sensor; 621. a housing; 622. a wire rope; 7. a support; 71. a pipe body; 72. positioning a plate; 8. a soil layer; 9. a support plate; 10. a reinforcing frame; 11. a steel wedge; 12. and (4) a notch.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a large-span net rack jacking construction process. Referring to fig. 1 and 2, the construction process for jacking the large-span net rack 1 includes the following steps,
jacking quantity and position are calculated, stress analysis calculation is carried out on the net rack 1 structure model, the quantity and the positions of jacking points are selected, in the embodiment, the number of the jacking points is 8, and the jacking points are all selected as the upper chord balls of the net rack 1.
The method comprises the following steps of assembling a net rack 1, integrally assembling the net rack 1 on the upper surface of a second floor 2, gradually extending the net rack 1 from the middle to the periphery, and arranging horizontal supporting points below the net rack 1, specifically, arranging a plurality of horizontal supporting points below the net rack 1, installing lower chord spheres, connecting lower chords, installing web members and upper chord spheres, connecting the assembled upper chord spheres and web member triangular cones to a lower chord layer, installing the upper chord spheres and the web members, installing two layers of grids into basic units, and expanding the basic units until the assembling of the net rack 1 is completed.
Installing a jacking device, installing the jacking device on the upper surface of the second floor slab 2 according to the preset jacking point position, wherein the jacking device is positioned under a ball joint to be jacked, a backing plate 3 is laid between the jacking device and the upper surface of the second floor slab 2, and the position of the jacking device is adjusted to enable the central line of the jacking device to be vertically aligned with the center of the ball joint to be jacked.
Reinforcing the floor slab 2, paying off the jacking points to the ground of one floor according to the projection position, tamping a soil layer 8 on the ground of one floor, wherein the tamping area of the soil layer 8 is 3 × 3 square meters, a supporting plate 9 is laid on the upper surface of the soil layer 8, a reinforcing frame 10 is installed between the supporting plate 9 and the floor slab 2 of the two floors, the reinforcing frame 10 is formed by stacking and installing standard joints 41, the top end of the reinforcing frame 10 is knocked oppositely by steel wedges 11, so that the steel wedges 11 are tightly attached to the lower surface of the floor slab 2 of the two floors, and the jacking stress is directly transmitted to the ground.
Jacking the net rack 1, starting a hydraulic pump 52 to enable a piston rod of a hydraulic oil cylinder 51 to synchronously rise for a stroke, installing a second standard joint 41 above the first standard joint 41, returning oil from the hydraulic pump 52 to enable a cylinder body of the hydraulic oil cylinder 51 to rise, moving a cross beam 43 to the second standard joint 41 to finish a stroke, repeating the jacking step of the net rack 1 to enable the net rack 1 to rise to a height 10-20cm above the designed elevation, stopping jacking, and filling all net rack 1 components including the support 7 of the net rack 1 in a jacking state.
After the hydraulic pump 52 is started, when the height difference of the rising of each hydraulic oil cylinder 51 is within 10mm, each hydraulic oil cylinder 51 keeps rising; when the height difference of the rising of each hydraulic oil cylinder 51 is larger than 10mm, the hydraulic oil cylinder 51 larger than 10mm stops working until the height difference is smaller than 10mm, and the hydraulic oil cylinder 51 rises again.
When the jacking height of the net rack 1 is larger than 3m, the wind cable rope is additionally arranged, one end of the wind cable rope is connected with the standard knot 41, and the other end of the wind cable rope is connected with a building structure, so that the influence of wind power on the jacking of the net rack 1 is reduced, and the stability and the safety of jacking work are improved.
The height of one stroke of the hydraulic oil cylinder 51 is 750mm and 1000mm, and in the embodiment, the height of one stroke of the hydraulic oil cylinder 51 is 750 mm.
And (3) unloading and mounting, so that the hydraulic oil cylinder 51 synchronously descends to drive the net rack 1 to fall on a preset mounting seat, the net rack 1 descends by 10mm every time, and after the first 10mm descends, whether the net rack 1 and the jacking device are abnormal or not is observed. If abnormal phenomena occur, the falling must be stopped immediately, the reason and the corresponding measures are found out until all the hydraulic oil cylinders 51 at the jacking points are separated from the spherical nodes of the jacked net rack 1, and the jacking construction is completed.
Wherein, backing plate 3 and backup pad 9 are 2 x 2 square meters's steel sheet, and steel sheet thickness 20mm, rack 1 is just putting quadrangular pyramid bolt ball node rack, and rack 1 span 43.3m, rack 1 length71.3m, projected area 3087.29m2The thickness of the net rack 1 is 1.9-2.98 m, the cross section phi 60 x 3.5-phi 219 x 14 of the rod piece of the net rack 1, the specification phi 100-phi 200 of the bolt ball, the total amount of the net rack 1 is about 120t, the weight of the part needing to be jacked is 68.2 t, the elevation of the installation part of the net rack 1 is 20.4m, and the height of the surface of the second floor slab 2 is 10.15 m.
Practice through this embodiment, in limited construction space, adopt whole hydraulic jacking construction process can satisfy construction demands such as safety, quality, construction cycle to large-span rack 1, rack 1 assembles for general high altitude at the floor, reduces affiliated platform and sets up, and the human input is few, and the efficiency of construction is high. Construct the accessory transportation distance short, convenient and fast, machinery handling member frequency and time reduce, only need perpendicular transportation machinery handling material to operation face can, need not long-time handling cooperation installation, assemble the progress fast, shorten construction cycle.
Before the integral jacking, the assembled net rack 1 is integrally checked and accepted, and the quality is easy to control; the standard knot 41 can be quickly disassembled and assembled, before the integral jacking, the grid 1 structure is firstly assembled, except that the rod pieces fixedly connected with the embedded part of the main body structure are assembled in the installation original position, other rod pieces and bolt balls are assembled on the floor 2, a starting operation platform is not required to be erected, the high-altitude operation time is greatly shortened, and the safety risk of assembling the grid 1 is reduced.
The jacking device comprises a supporting mechanism 4, a hydraulic mechanism 5 and a control mechanism 6, wherein the control mechanism 6 jacks the net rack 1 on the supporting mechanism 4 by controlling the hydraulic mechanism 5.
Referring to fig. 3, the supporting mechanism 4 includes a plurality of standard joints 41 for stacking, a connecting assembly 42 for connecting the standard joints 41, and a cross beam 43; the standard joint 41 comprises a connecting plate 411, an upper angle steel 412, a lower angle steel 413, an angle steel 414, an ear plate 415 and two standard frames 416 which are symmetrically arranged, each standard frame 416 comprises two upright columns 4161 which are arranged in parallel, two cross rods 4162 which are arranged in parallel and a plurality of reinforcing rods 4163, two ends of each cross rod 4162 are respectively welded with the two upright columns 4161, two ends of each reinforcing rod 4163 are respectively welded with the two cross rods 4162, the connecting plate 411 is welded with two ends of each upright column 4161, and the ear plate 415 is welded with two ends of each upright column 4161.
The both ends of going up angle steel 412 can dismantle with the otic placode 415 of two stands 4161 upper ends through bolt and nut and be connected, and the both ends of angle steel 413 can dismantle with the otic placode 415 of two stands 4161 lower extremes through bolt and nut and be connected, and the slope of angle steel 414 sets up and can dismantle with otic placode 415 through bolt and nut and be connected, and the connecting plate 411 of two adjacent standard festival 41 can dismantle through coupling assembling 42 and be connected, and coupling assembling 42 is the bolt and nut. Because the standard knot 41 is a detachable structure, the structural strength is high, the quick assembly and disassembly are convenient, the continuous jacking operation is facilitated, the construction efficiency is improved, and the construction period is shortened.
Referring to fig. 4 and 5, the hydraulic mechanism 5 includes a hydraulic oil cylinder 51, a hydraulic pump 52, a hydraulic control valve 53, an upper support frame 54, and a lower support frame 55, the hydraulic oil cylinder 51 is vertically disposed inside the standard joint 41, a cylinder body of the hydraulic oil cylinder 51 is fixedly connected with the lower support frame 55 through bolts and nuts, the cross beam 43 is located between the lower support frame 55 and the bottom of the standard joint 41, a piston rod of the hydraulic oil cylinder 51 is fixedly connected with the upper support frame 54 through bolts and nuts, and the upper support frame 54 is fixedly connected with a support 7 for jacking the ball joint through bolts and nuts.
The support 7 comprises a pipe body 71 and a positioning plate 72, the pipe body 71 and the hydraulic oil cylinder 51 are coaxially arranged, one end of the pipe body 71 is fixedly connected with the upper support frame 54 through bolts and nuts, the positioning plate 72 is welded with the outer wall of one end, close to the notch 12, of the pipe body 71, the positioning plate 72 is arranged to be 4 and distributed at equal intervals along the circumferential direction of the pipe body 71, and the notches 12 matched with the ball joints are formed in one ends, far away from the upper support frame 54, of the pipe body 71 and the.
When the net rack 1 is lifted, the hydraulic pump 52 provides power, the hydraulic oil cylinder 51 drives the upper support frame 54 to lift, the support 7 is driven to lift, and the whole net rack 1 is driven to lift. The pipe body 71 is matched with the positioning plate 72 to position the ball joint of the net rack 1, so that the jacking stability and accuracy are improved, and the jacking quality is improved.
Referring to fig. 4 and 5, the control mechanism 6 is connected to the hydraulic cylinder 51 through the hydraulic control valve 53, the control mechanism 6 includes a controller 61 and a rope displacement sensor 62, the controller 61 is a PLC controller, the rope displacement sensor 62 includes a housing 621 and a wire rope 622, the housing 621 is fixedly connected to the upper support frame 54 through bolts and nuts, the wire rope 622 is bound to the lower support frame 55, the rope displacement sensor 62 is electrically connected to the controller 61, and the controller 61 is electrically connected to the hydraulic control valve 53. Stay cord displacement sensor 62 can detect hydraulic cylinder 51's jacking height, feeds back to controller 61, and controller 61 is through controlling hydraulic control valve 53 to control hydraulic cylinder 51 work guarantees that rack 1 stable in structure promotes in step and does not take place to warp, process safe and reliable in the jacking.
The implementation principle of the large-span net rack jacking construction process provided by the embodiment of the application is as follows: after the net rack 1 is assembled, the jacking device is installed and the floor slab 2 is reinforced, the hydraulic pump 52 is started to enable the piston rod of the hydraulic oil cylinder 51 to synchronously ascend for a stroke, the second standard joint 41 is installed above the first standard joint 41, the hydraulic pump 52 returns oil to enable the cylinder body of the hydraulic oil cylinder 51 to ascend, the cross beam 43 is moved to the second standard joint 41 to support the lower support frame 55 to complete a stroke, and the jacking is stopped when the step of jacking the net rack 1 is repeated to enable the net rack 1 to ascend to 10-20cm above the designed elevation. The method has the effects of shortening the construction period and improving the installation quality and the construction safety.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The large-span net rack jacking construction process is characterized in that: comprises the following steps of (a) carrying out,
the jacking quantity and position are calculated, the structural model of the net rack (1) is subjected to stress analysis and calculation, and the quantity and the positions of jacking points are selected;
the method comprises the following steps that (1) net racks are assembled, the net racks (1) are integrally assembled on the upper surfaces of two layers of floor slabs (2), the net racks (1) gradually extend from the middle to the periphery, and horizontal supporting points are arranged below the net racks (1);
installing a jacking device, installing the jacking device on the upper surface of the second floor (2) according to a preset jacking position, wherein the jacking device is positioned under a ball joint to be jacked, laying a base plate (3) between the jacking device and the upper surface of the second floor (2), and adjusting the position of the jacking device to enable the central line of the jacking device to be vertically aligned with the center of the ball joint to be jacked;
the jacking device comprises a supporting mechanism (4), a hydraulic mechanism (5) and a control mechanism (6), wherein the supporting mechanism (4) comprises a plurality of standard joints (41) which are used for being stacked, a connecting assembly (42) which is used for connecting the standard joints (41), and a cross beam (43); the hydraulic mechanism (5) comprises a hydraulic oil cylinder (51), a hydraulic pump (52), a hydraulic control valve (53), an upper support frame (54) and a lower support frame (55), the hydraulic oil cylinder (51) is vertically arranged inside the standard joint (41), a cylinder body of the hydraulic oil cylinder (51) is fixedly connected with the lower support frame (55), the cross beam (43) is positioned between the lower support frame (55) and the bottom of the standard joint (41), a piston rod of the hydraulic oil cylinder (51) is fixedly connected with the upper support frame (54), and a support (7) for jacking a ball joint is fixedly connected to the upper support frame (54); the control mechanism (6) is connected to the hydraulic oil cylinder (51) through a hydraulic control valve (53);
reinforcing the floor (2), paying off the jacking points to the first floor according to the projection positions, tamping a soil layer (8) on the first floor, paving a supporting plate (9) on the upper surface of the soil layer (8), installing a reinforcing frame (10) between the supporting plate (9) and the second floor (2), and knocking the top ends of the reinforcing frame (10) oppositely by using steel wedges (11) to enable the steel wedges (11) to be tightly attached to the lower surface of the second floor (2);
jacking the net rack (1), starting a hydraulic pump (52) to enable a piston rod of a hydraulic oil cylinder (51) to synchronously rise for a stroke, installing a second standard joint (41) above the first standard joint (41), enabling a cylinder body of the hydraulic oil cylinder (51) to rise by oil return of the hydraulic pump (52), moving a cross beam (43) to the second standard joint (41), completing a stroke, repeating the step of jacking the net rack (1) to enable the net rack (1) to rise to be 10-20cm above a designed elevation, and stopping jacking;
and (4) unloading and mounting, so that the hydraulic oil cylinder (51) synchronously descends to drive the net rack (1) to fall on a preset mounting seat, and the jacking construction is completed.
2. The large-span net rack jacking construction process according to claim 1, characterized in that: control mechanism (6) are including controller (61) and stay cord displacement sensor (62), stay cord displacement sensor (62) are including casing (621) and wire rope (622), casing (621) and upper support frame (54) fixed connection, wire rope (622) and lower support frame (55) fixed connection, stay cord displacement sensor (62) are connected with controller (61) electricity, controller (61) are connected with hydraulic control valve (53) electricity.
3. The large-span net rack jacking construction process according to claim 1, characterized in that: the standard joint (41) comprises a connecting plate (411), upper angle steel (412), lower angle steel (413), bevel angle steel (414), an ear plate (415) and two standard frames (416) which are symmetrically arranged, each standard frame (416) comprises two upright columns (4161) which are arranged in parallel, two cross rods (4162) which are arranged in parallel and a plurality of reinforcing rods (4163), two ends of each cross rod (4162) are fixedly connected with the two upright columns (4161) respectively, two ends of each reinforcing rod (4163) are fixedly connected with the two cross rods (4162) respectively, the connecting plate (411) is fixedly connected with two ends of each upright column (4161), and the ear plate (415) is fixedly connected with two ends of each upright column (4161);
the two ends of the upper angle steel (412) are detachably connected with the ear plates (415) at the upper ends of the two upright columns (4161), the two ends of the lower angle steel (413) are detachably connected with the ear plates (415) at the lower ends of the two upright columns (4161), the oblique angle steel (414) is obliquely arranged and detachably connected with the ear plates (415), and the connecting plates (411) of the two adjacent standard sections (41) are detachably connected.
4. The large-span net rack jacking construction process according to claim 1, characterized in that: the support (7) comprises a pipe body (71) and a positioning plate (72), the pipe body (71) and the hydraulic oil cylinder (51) are coaxially arranged, one end of the pipe body (71) is fixedly connected with the upper support frame (54), the positioning plate (72) is connected with the outer wall of one end, close to the notch (12), of the pipe body (71), the positioning plate (72) is arranged to be distributed in a plurality of modes and is distributed at equal intervals along the circumferential direction of the pipe body (71), and the notch (12) matched with the ball joint is formed in one end, far away from the upper support frame (54), of the pipe body (71) and the positioning plate (72).
5. The large-span net rack jacking construction process according to claim 1, characterized in that: the net rack (1) assembling specifically comprises the following steps of arranging a plurality of horizontal supporting points below the net rack (1), installing a lower chord ball, connecting a lower chord, installing a web member and an upper chord ball, connecting the assembled upper chord ball and web member triangular cone to a lower chord layer, installing the upper chord member and the web member, installing two layers of grids into basic units, and expanding the basic units until the assembling of the net rack (1) is completed.
6. The large-span net rack jacking construction process according to claim 1, characterized in that: in the step of jacking the net rack (1), after the hydraulic pump (52) is started, when the rising height difference of each hydraulic oil cylinder (51) is within 10mm, each hydraulic oil cylinder (51) keeps rising; when the height difference of the rising of each hydraulic oil cylinder (51) is more than 10mm, the hydraulic oil cylinder (51) with the height more than 10mm stops working, and when the height difference is less than 10mm, the hydraulic oil cylinder (51) rises again.
7. The large-span net rack jacking construction process according to claim 1, characterized in that: in the step of jacking the net rack (1), when the jacking height of the net rack (1) is more than 3m, a wind cable rope is additionally arranged, one end of the wind cable rope is connected with the standard knot (41), and the other end of the wind cable rope is connected with a building structure.
8. The large-span net rack jacking construction process according to claim 1, characterized in that: in the step of jacking the net rack (1), the height of one stroke of the hydraulic oil cylinder (51) is 750-1000 mm.
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Cited By (5)
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| CN112302185A (en) * | 2020-10-20 | 2021-02-02 | 智远谋 | High rack support frame for jacking of security |
| CN112681525A (en) * | 2020-12-14 | 2021-04-20 | 中国建筑第八工程局有限公司 | Jacking and supporting system and method for large-span steel structure |
| CN114575577A (en) * | 2022-03-14 | 2022-06-03 | 中建八局第二建设有限公司 | Ultrahigh-rise deviation-rectifying torsion-correcting jacking platform and using method thereof |
| CN114922461A (en) * | 2022-05-24 | 2022-08-19 | 江苏鸿基节能新技术股份有限公司 | Building structure jacking construction device and process |
| CN118007971A (en) * | 2024-04-10 | 2024-05-10 | 中建材(合肥)钢构科技有限公司 | Welding ball net frame jacking construction installation device |
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| CN118007971A (en) * | 2024-04-10 | 2024-05-10 | 中建材(合肥)钢构科技有限公司 | Welding ball net frame jacking construction installation device |
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