CN110792265B - Integral synchronous jacking equipment for large-span combined type overweight eccentric slope angle steel structure - Google Patents

Integral synchronous jacking equipment for large-span combined type overweight eccentric slope angle steel structure Download PDF

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Publication number
CN110792265B
CN110792265B CN201911052218.0A CN201911052218A CN110792265B CN 110792265 B CN110792265 B CN 110792265B CN 201911052218 A CN201911052218 A CN 201911052218A CN 110792265 B CN110792265 B CN 110792265B
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CN
China
Prior art keywords
jacking
jack
steel structure
support
plate
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CN201911052218.0A
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CN110792265A (en
Inventor
刘积海
郭颖
徐浩
赵继红
杨帆
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First Construction Co ltd Of China Construction Sixth Engineering Bureau
China Construction Sixth Engineering Division Co Ltd
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China Construction Sixth Engineering Division Co Ltd
China Construction Sixth Installation Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14Conveying or assembling building elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F2700/00Lifting apparatus
    • B66F2700/05Hydraulic jacks

Abstract

The invention discloses integral synchronous jacking equipment for a large-span combined type overweight eccentric slope angle steel structure, which comprises a plurality of jacking units, wherein each jacking unit comprises a cross joist and a jacking frame which are coaxially arranged in sequence from top to bottom, and the jacking frame is jacked by a jack; the jacking frame comprises a jacking support, an initial section, a multi-stage standard section and a base which are coaxially arranged from top to bottom in sequence; the top of the jacking support is provided with a jacking ball support, the bottom of the cross joist is provided with a hemispherical hinged support matched with the jacking ball support, and a net rack upper chord ball support fixedly connected with the cross joist is arranged above the cantilever end of the cross joist; the heights of the initial pitch bottom surfaces of the jacking frames of all the jacking units from the terrace are the same, and the top surfaces are leveled along the gradient of the net rack; the jacking frame is tied with the combined steel structure through the inverted guy rope, and the combined steel structure is tied with the jacking foundation through the in-position guy rope. The invention can safely and reliably realize the integral synchronous jacking of the combined steel structure and can greatly reduce the high-altitude operation.

Description

Integral synchronous jacking equipment for large-span combined type overweight eccentric slope angle steel structure
Technical Field
The invention relates to jacking equipment for a steel structure, in particular to integral synchronous jacking equipment for a large-span combined type overweight eccentric slope angle steel structure.
Background
With the continuous development of construction technology, the grid structure is rapidly developed and widely applied in nearly thirty or four years due to the characteristics of large rigidity, good integrity, good earthquake resistance, light dead weight, steel saving, good adaptability and the like. The traditional net rack mounting methods at present comprise common construction methods such as a high-altitude assembling method, a lifting method, an integral hoisting method and a jacking method. The high-altitude assembly method needs to consume a large amount of frame materials to set up an operation platform, and has higher material lease and labor cost. Although the integral hoisting in-place method has the characteristics of simple and convenient construction, short construction period, easy guarantee of engineering quality and the like, the overhead cost of a crane is too high, the crane walking road needs to be treated, the construction cost is very high, the key is limited by the site, and the construction requirement is difficult to meet; although hydraulic pressure whole lifting is not restricted by the place, but has higher requirement as the reliable hoisting fulcrum to original structure, and the structural steel column can not satisfy the bearing capacity requirement. The jacking method integrates the advantages, the net rack is assembled on the ground, safety and time saving are realized, the assembling quality is convenient to guarantee, and the installation of the jacking frame body is not limited by the field and the surrounding environment, so that the jacking method is generally applied to the construction of the net rack structure with balanced weight.
However, the roof of a certain project is a combined type eccentric overweight slope angle steel structure, the main structure is an inclined quadrangular pyramid net rack, the long edge is 84m, the short edge is 60 m, the height is 2.4m, the difference height of two side slopes reaches 1.8 m, the maximum bolt ball weight of a high slope is 645kg, and the minimum bolt ball weight of a low slope is 4 kg; a steel door type air-conditioning machine room with the length of 69.5m, the width of 18.2m and the height of 5.15m-5.7m is additionally arranged at the upper part of the high end of the net rack. The jacking height of the steel structure is 9.25 m. Therefore, the project is not suitable for jacking by adopting the traditional method, and a new jacking structure and a new jacking method need to be designed according to the characteristics and the field situation of the project.
Disclosure of Invention
The invention provides integral synchronous jacking equipment for a large-span combined type overweight eccentric slope angle steel structure, which can greatly reduce high-altitude operation and safely and reliably realize integral synchronous jacking of the large-span combined type overweight eccentric slope angle steel structure, aiming at solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: the integral synchronous jacking equipment for the large-span combined type overweight eccentric slope angle steel structure comprises a plurality of jacking units, wherein the jacking units are arranged on a plurality of jacking foundations in a one-to-one correspondence manner, and the jacking foundations are arranged on a terrace; each jacking unit comprises a cross joist and a jacking frame which are coaxially arranged from top to bottom in sequence, and the jacking frame is jacked by a jack; the jacking frame comprises a jacking support, an initial section, a multi-stage standard section and a base which are coaxially arranged from top to bottom in sequence; the initial section and each level of standard section are in split connection structure, and the bottoms are connected by a connecting plate; the jack is fixedly arranged on the base, and a telescopic rod of the jack is connected with a universal jack supporting plate; when the telescopic rod of the jack extends out, the universal jack supporting plate jacks the connection parts of the two sections at the lowest part of the jacking frame, the telescopic rod of the jack retracts after rotating, and when the telescopic rod retracts, the universal jack supporting plate descends in a hollow structure in the jacking frame; the top of the jacking support is provided with a jacking ball support, the bottom of the cross joist is provided with a hemispherical hinged support matched with the jacking ball support, and a net rack upper chord ball support fixedly connected with the cantilever end of the cross joist is arranged above the cantilever end of the cross joist; the heights of the bottom surfaces of the initial sections of the jacking frames of all the jacking units from the floor are the same, and the top surfaces of the jacking frames are leveled along the gradient of the net rack; the jacking frame is tied with the combined steel structure through an inverted guy cable, and the combined steel structure is tied with the jacking foundation through an in-position guy cable; the jacking force of all the jacking unit jacks is different and is determined according to the design value.
The universal jacking plate is sleeved on the jack cap head, the jack cap head is buckled on the jack cap head rod, the universal jacking plate and the jack cap head rod form spherical hinge connection, and the jack cap head rod is coaxially and fixedly connected with the telescopic rod of the jack.
The jack cap rod is in threaded connection with the telescopic rod of the jack.
An adjusting handle vertical to the jack head rod is fixedly connected to the jack head rod.
The hemispherical hinged support is provided with a gusset plate fixedly connected with the bottom of the cross joist and a hemispherical structure fixedly connected below the gusset plate and matched with the jacking ball support.
The jacking ball support and the net rack winding ball support are identical in structure and are provided with a bottom plate, a central pipe column is arranged on the bottom plate, a plurality of wing plates which are uniformly distributed along the circumferential direction and fixedly connected with the central pipe column are arranged on the periphery of the central pipe column, the bottom edges of the wing plates are fixedly connected with the bottom plate, and all the top edges of the wing plates and the top of the central pipe column form a spherical crown structure which is matched with the jacking ball.
Jacking ball holds in the palm with the net rack is last string ball holds in the palm the structure the same, is equipped with the bottom plate the central rigid coupling of bottom plate has interior tubular column the outside cover of interior tubular column is equipped with outer tubular column, outer tubular column is place freely on the bottom plate, interior tubular column is than outer tubular column is short, and the same spherical part is supported jointly to the two interior tubular column and all pack in the annular space between interior, outer tubular column has and is used for supporting the face sand body of spherical part outer tubular column bottom is equipped with the sand outlet be equipped with the gate on the sand outlet.
And a diagonal gusset plate fixedly connected with the intersection of the cross joist and the cross joist is arranged above the cross joist, a supporting upright rod is fixedly connected to the diagonal gusset plate, and a diagonal draw bar is respectively arranged between the supporting upright rod and the four cantilever beams of the cross joist.
The cantilever beam of the cross joist is formed by welding H-shaped steel, two bottom liner plates are respectively welded on two sides of an upper wing plate at the cantilever end of the cross joist, reinforcing rib plates are respectively arranged on two sides of a web plate at the cantilever end of the cross joist, the top edges of the reinforcing rib plates are connected with the corresponding bottom liner plates and the upper wing plate, and the bottom edges of the reinforcing rib plates are connected with the corresponding lower wing plates.
The base is provided with a support structure shaped like a Chinese character 'mi', and the support structure shaped like the Chinese character 'mi' is welded inside the rectangular frame.
The invention has the advantages and positive effects that:
firstly), the lower chord ball of the net rack is used as a supporting point for ground assembly of the combined steel structure, the upper chord ball of the net rack is used as a jacking supporting vertex, and the height of the net rack is contained in the height of the jacking frame, so that the ground assembly height of the combined steel structure can be reduced to the maximum extent, and high-altitude operation is avoided. The assembling of the combined steel structure is completed on the ground, so that the quality of welding seams is convenient to ensure, the quality inspection such as welding seam detection, member installation position check and the like is convenient, the installation quality of the combined steel structure is convenient to ensure, the vertical transportation and hoisting operation can be reduced, and the potential safety hazard of high-altitude operation is avoided; the combined steel structure is assembled on the ground, so that the jacking frame is convenient to install, the construction efficiency is high, and the construction quality is easy to guarantee.
And secondly), the hydraulic synchronous jacking has the advantage of extremely small dynamic load, and the jacking frame adopts the characteristics that the standard joint and the lifting appliance can be repeatedly utilized, so that the use amount of temporary jacking facilities can be reduced to the minimum, and the control of construction cost is facilitated.
Thirdly), the height difference of the initial section of the jacking frame is adapted to the slope difference of the net rack, and then the synchronous jacking horizontal plane is established. The synchronous jacking process is stable, the jacking synchronism is good, the labor intensity is low, the efficiency is high, the construction is safe, the engineering progress can be accelerated, and the construction cost is reduced.
And fourthly) the cross joist with the ball support is adopted to support the upper chord ball of the net rack, so that the blocking of the lower chord of the net rack (a quadrangular pyramid net rack is obliquely arranged, and a lower chord member is arranged right below the upper chord ball of the net rack) can be avoided, and meanwhile, the supporting point of the jack is changed from four to four, so that the jacking counter force is dispersed to a certain extent, and the supporting stress is more stable.
Fifthly), the combined steel structure can be locked at any position in the jacking process, any jack can be independently adjusted, the adjustment precision is high, and the form and position errors of the combined steel structure in the jacking process can be effectively reduced.
Sixth) hydraulic jack passes through hydraulic circuit drive, and the acceleration is minimum in the action process, and is hardly to the combined steel structure that is jacked additional dynamic load (vibration and impact), and at whole jacking in-process, the usable hydraulic jacking system of combined steel structure hovers in the sky for a long time accurately, is favorable to the construction.
Seventhly), the upper chord ball is hinged with the ball support, the jacking frame is hinged with the cross joist, the jack is jacked by the universal jacking supporting plate to form three hinged supports, the damage of an oil cylinder caused by the deflection of the jacking frame in the jacking process can be prevented, the eccentric influence of the weight of the net rack in the jacking process can be effectively eliminated, the jacking counter-force of each jacking point is relatively uniform, and the integral jacking stability of the net rack is ensured.
Eighthly), the lower chord ball of the net rack is locked with the jacking frame by adopting an inverted cable wind rope, so that the jacking frame and the combined steel structure form a whole, and the safety of the jacking process is greatly improved.
In conclusion, the invention can complete the integral assembly of the combined steel structure on the ground, greatly reduce the overhead work amount, shorten the hydraulic jacking operation time, effectively ensure the total construction period of the steel structure installation, save the construction cost and meet the integral control requirements of construction process, quality, safety, progress, cost and the like. The jacking equipment has small volume, light dead weight and large bearing capacity, is particularly suitable for the integral jacking operation of a large-span combined type overweight eccentric slope angle steel structure, and is particularly suitable for a combined steel structure adopting an obliquely-placed quadrangular pyramid net rack.
By utilizing a finite element simulation technology, the MST software and the Midas/Gen software are adopted for model analysis to carry out double calculation analysis and check, the stress and deformation of the net rack during the integral jacking are simulated, and the stress and the deformation are in the range allowed by the specification, so that the jacking safety and reliability can be ensured. The hydraulic synchronous jacking controls all jacking points to be synchronous through a computer, and the net rack can keep a stable pose in the jacking process. The synchronous control precision is high, and the degree of automation of equipment is high, and convenient operation is nimble, and the security is good, and the reliability is high, and the use is wide, and the commonality is strong.
Drawings
FIG. 1 is a floor plan of the present invention;
FIG. 2 is a schematic elevation view of the present invention;
FIG. 3 is a schematic structural view of a jacking frame of the present invention;
FIG. 4 is an exploded view of FIG. 3;
FIG. 5 is a schematic view of the connection between the jack and the universal jacking plate according to the present invention;
FIG. 6 is a schematic view of a hemispherical hinge support of the present invention;
FIG. 7 is a schematic view of a wing plate ball support of the present invention;
FIG. 8 is a schematic view of a flask-style ball retainer of the present invention;
FIG. 9 is a cross-sectional view of FIG. 8;
FIG. 10 is a schematic view of a cross joist according to the present invention;
FIG. 11 is a schematic view of the assembled steel structure after being assembled on the ground before the present invention is applied;
FIG. 12 is a schematic view showing the support conversion of the lower chord ball of the rack supported by the buttress to the upper chord ball of the rack supported by the jacking frame by the combined steel structure through the jack in the application process of the invention;
FIG. 13 shows the combined steel structure after the support conversion from the support of the lower chord ball of the net rack by the buttress to the upper chord ball of the net rack by the jacking frame is realized by the jack in the application process of the invention;
FIG. 14 is a schematic diagram of the synchronous jacking operation performed during the application of the present invention.
In the figure: 1-1 part of net rack, 1-1-1 part of permanent structure reinforcing rod piece, 1-2 parts of steel frame, 1-3 parts of buttress, 2-1 part of cross joist, 2-2 parts of net rack upper chord sphere support, 2-3 parts of hemisphere hinge support, 2-3-1 parts of gusset plate, 2-3-2 parts of hemisphere structure, 2-4 parts of bottom plate, 2-5 parts of wing plate, 2-6 parts of central pipe column, 2-7 parts of bottom plate, 2-8 parts of outer pipe column, 2-9 parts of inner pipe column, 2-10 parts of gate, 2-11 parts of diagonal draw gusset plate, 2-12 parts of support upright rod, 2-13 parts of diagonal draw rod, 2-14 parts of bottom lining plate, 2-15 parts of reinforcing rib plate, 3-1 part of top support, 3-1-1 part of jacking sphere support, 3-2 parts of an initial section, 3-3 parts of a standard section, 3-4 parts of a jack, 3-5 parts of a base, 3-6 parts of a universal top supporting plate, 3-7 parts of a jack cap head, 3-8 parts of a jack cap head rod, 3-9 parts of a handle, 3-10 parts of a connecting plate, 4 parts of a reverse pulling cable rope, 5 parts of a positioning cable rope, 6 parts of a steel column, 7 parts of a jacking foundation.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 14, the large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment comprises a plurality of jacking units, wherein the jacking units are arranged on a plurality of jacking foundations 7 in a one-to-one correspondence manner, and the jacking foundations 7 are arranged on a terrace; each jacking unit comprises a cross joist 2-1 and a jacking frame which are coaxially arranged from top to bottom in sequence, and the jacking frame is jacked by a jack 3-4.
The jacking frame comprises a jacking support 3-1, an initial section 3-2, a multi-stage standard section 3-3 and a base 3-5 which are coaxially arranged from top to bottom in sequence.
The initial section 3-2 and each stage of standard section 3-3 are in split connection structure, and the bottoms are connected by connecting plates 3-10.
The jack 3-4 is fixedly arranged on the base 3-5, and a telescopic rod of the jack 3-4 is connected with a universal jack supporting plate 3-6.
When the telescopic rods of the jacks 3-4 extend out, the universal top supporting plates 3-6 jack the connection parts of the two sections at the bottom of the jacking frame, the telescopic rods of the jacks 3-4 retract after rotating, and when the telescopic rods retract, the universal top supporting plates 3-6 descend in the hollow structure in the jacking frame.
The top of the jacking 3-1 is provided with a jacking ball support 3-1-1, the bottom of the cross joist 2-1 is provided with a hemispherical hinged support 2-3 matched with the jacking ball support 3-1-1, and a net rack upper chord ball support 2-2 fixedly connected with the cantilever end of the cross joist 2-1 is arranged above the cantilever end of the cross joist 2-1.
The heights of the bottom surfaces of the initial sections 3-2 of the jacking frames of all the jacking units from the floor are the same, and the top surfaces are leveled along the gradient of the net rack.
The jacking frame is tied with the combined steel structure through an inverted guy rope 4, and the combined steel structure is tied with the jacking foundation 7 through an in-position guy rope 5.
The jacking force of all the jacking unit jacks 3-4 is not the same and is determined according to the design value.
According to the characteristic of the weight eccentricity of the combined steel structure, the arrangement scheme of the jacking points and the jack parameters arranged on the corresponding jacking points are determined, so that the purposes of load balancing and synchronous jacking are achieved, and the jacking process is safe and reliable.
The invention adopts the self-locking hydraulic jack as jacking power, adopts the jacking frame which can be continuously lengthened to implement integral synchronous jacking on the long-span combined type overweight eccentric slope angle steel structure, and is safe and reliable.
In the embodiment, the telescopic rod of the jack 3-4 is connected with a universal jack supporting plate 3-6, the universal jack supporting plate 3-6 is sleeved on a jack cap 3-7, the jack cap 3-7 is buckled on a jack cap rod 3-8, the jack cap rod 3-7 and the jack cap rod form a spherical hinge connection, and the jack cap rod 3-8 is coaxially and fixedly connected with the telescopic rod of the jack 3-4.
The jack cap rod 3-8 is in threaded connection with the telescopic rod of the jack 3-4; an adjusting handle 3-9 vertical to the jack head rod 3-8 is fixedly connected to the jack head rod, so that fine adjustment of the jacking height is facilitated.
The hemispherical hinged support 2-3 is provided with a gusset plate 2-3-1 fixedly connected with the bottom of the cross joist 2-1 and a hemispherical structure fixedly connected below the gusset plate 2-3-1 and inosculated with the jacking spherical support 3-1-1.
The jacking ball support 3-1-1 and the net rack upper chord ball support 2-2 are identical in structure, can be wing plate type ball supports and are provided with bottom plates 2-4, central pipe columns 2-6 are arranged on the bottom plates 2-4, a plurality of wing plates 2-5 which are fixedly connected with the central pipe columns 2-6 are circumferentially and uniformly distributed around the central pipe columns 2-6, the bottom edges of the wing plates 2-5 are fixedly connected with the bottom plates 2-4, and the top edges of all the wing plates 2-5 and the top of the central pipe columns 2-6 form a spherical crown structure which is matched with the jacking sphere.
The jacking ball support 3-1-1 and the net rack upper chord ball support 2-2 have the same structure, and can also adopt a sand box type ball support, the jacking ball support and the net rack upper chord ball support have the same structure and are provided with bottom plates 2-7, an inner pipe column 2-9 is fixedly connected in the center of the bottom plate 2-7, an outer pipe column 2-8 is sleeved outside the inner pipe column 2-9, the outer string 2-8 rests freely on the bottom plate 2-7, the inner string 2-9 being shorter than the outer string 2-8, both supporting the same spherical member, surface sand bodies for supporting the spherical components are filled in the inner pipe columns 2-9 and the annular space between the inner pipe column and the outer pipe column, and sand outlets are arranged at the bottoms of the outer pipe columns 2 to 8, and gates 2 to 10 are arranged on the sand outlets.
And a diagonal gusset plate 2-11 fixedly connected with the intersection of the cross joist 2-1 is arranged above the cross joist 2-1, a supporting upright rod 2-12 is fixedly connected on the diagonal gusset plate 2-11, and a diagonal draw bar 2-13 is respectively arranged between the supporting upright rod 2-12 and four cantilever beams of the cross joist 2-1 to prevent the cantilever beams from bending downwards and deforming.
The cantilever beam of the cross joist 2-1 is formed by welding H-shaped steel, two bottom liner plates 2-14 are respectively welded on two sides of an upper wing plate at the cantilever end of the cross joist 2-1, reinforcing rib plates 2-15 are respectively arranged on two sides of a web plate at the cantilever end of the cross joist 2-1, the top edges of the reinforcing rib plates 2-15 are connected with the corresponding bottom liner plates 2-14 and the upper wing plate, and the bottom edges of the reinforcing rib plates 2-15 are connected with the corresponding lower wing plate.
The base 3-5 is provided with a support structure shaped like a Chinese character 'mi', and the support structure shaped like a Chinese character 'mi' is welded inside the rectangular frame.
The step of using the equipment to integrally and synchronously lift up the large-span combined type overweight eccentric slope angle steel structure comprises the following steps:
1) and constructing jacking foundations 7 with corresponding quantity on the terrace according to the set jacking point positions.
The jacking foundation utilizes the engineering pile and forms an integral permanent structure with the terrace, and the reinforcing terrace structure can be reinforced while the bearing capacity of the jacking foundation is met.
2) After the terrace is hardened, the ground of the combined steel structure is assembled and accepted, the combined steel structure is provided with a net rack 1-1 with a slope angle and a steel frame 1-2 fixed at the high position of the net rack, when the combined steel structure is assembled, multipoint buttresses 1-3 which level the terrace along the slope of the net rack are adopted to support the lower chord ball of the net rack, and the rod piece with larger stress in the net rack is replaced by a permanent structure reinforcing rod piece 1-1-1 according to the jacking stress condition of the net rack, please refer to fig. 11.
The gradient of the steel frame 1-2 is 3%, and the gradient of the net rack 1-1 is 3%.
Because the jacking position that the rack set up under the jacking state is different with rack support point position under the permanent state, consequently at the jacking in-process, can lead to individuality member to take place to warp even rack unstability, through computational analysis, need carry out local member to the rack and strengthen, the reinforcement member is whole to be the web member, and is permanent stiffener.
Originally, keep the original structure of rack unchangeable as far as possible, avoid or reduce the design structure change, when unable satisfying the jacking requirement, make the pole quantity that needs strengthen or consolidate minimum, and then the principle of practicing thrift the cost, utilize the simulation technique, MIDAS/MST carries out calculation analysis, stress and deformation when simulation rack wholly jacks, consolidate the pole according to the calculated result, make the deformation in standard allowed range, according to the rack jacking atress condition, the pole that receives great atress in the rack is replaced into permanent structure and is strengthened the pole, carry out permanent reinforcement to jacking district's pole, in order to satisfy whole jacking demand, in order to offset the deformation that jacking in-process dead weight stress produced, make it form stable whole so that the jacking. Not only the installation quality of the net rack and the overall stability of the structure are ensured, but also the processes of dismantling and the like are saved, the high-altitude operation is avoided, and the construction period is saved.
3) Installing jacking equipment and implementing jacking
3.1) ground assembly of the cross joist 2-1 is respectively carried out at a plurality of set jacking point positions, and a net rack upper chord ball support 2-2 fixedly connected with the cantilever end of the cross joist is arranged above the cantilever end of the cross joist.
3.2) lifting the cross joist 2-1 to the upper string ball of the net rack, and realizing the butt joint of the upper string ball support 2-2 of the net rack and the upper string ball of the net rack.
The cross joist 2-1 adopts a ball support to prop up the upper chord ball of the net rack, and the support adopts a spherical hinge connection structure, so that the damage of the oil cylinder caused by the deflection of the jacking frame in the jacking process can be prevented. And hoisting the cross joist to the upper chord ball of the net rack by adopting a chain block so as to facilitate hoisting and dismantling of the cross joist.
If the lower chord ball is selected as the jacking point, the whole net rack needs to be lifted by 2m when the ground is assembled, and the jacking upper chord ball is determined by considering that the net rack is too heavy and the ground is difficult to assemble. Because the net rack in the embodiment is an obliquely-placed quadrangular pyramid net rack, the lower chord rod piece is arranged right below the upper chord sphere node of the net rack, and the hydraulic jack cannot directly support the upper chord sphere node. Considering the actual condition of the net rack and the convenience of construction, the upper end of each jacking frame is provided with the cross joist, and the four overhanging ends of the cross joist respectively prop up the upper chord ball, so that the lower chord member of the net rack can be avoided, and the jacking counter force can be dispersed to a certain extent.
3.3) concentrically welding a hemispherical hinged support 2-3 at the bottom of the cross joist.
3.4) installing a base 3-5 on the jacking basis, and installing a jack 3-4 on the base 3-5 according to the designed jacking force; the jack 3-4 is used for driving the jacking support 3-1 to jack the hemispherical hinged support 2-3 for jacking, when the jacking is high enough to replace the buttress 1-3 with the initial section 3-2 to support the combined steel structure, the initial section 3-2 is inserted between the jacking support 3-1 and the base 3-5 and is connected with the corresponding jacking support 3-1, the buttress 1-3 is withdrawn, all the jacks 3-4 simultaneously fall back until the initial section 3-2 falls onto the corresponding base 3-5, and the combined steel structure realizes the support conversion from the lower chord ball of the net rack supported by the buttress 1-3 to the upper chord ball of the net rack supported by the jacking frame through the jack 3-4. Please refer to fig. 12-13.
3.5) carrying out synchronous jacking
3.5.1) trial jacking, adjusting the bottom elevations of all the initial sections 3-2 to be the same in the jacking process, adjusting the jacking displacement of all the jacking points to be synchronous, and determining jacking parameters to meet the requirement that the form and position errors of the combined steel structure are within an allowable range.
The jacking parameters mainly comprise jacking speed, jacking height error values of all jacking points and the like.
3.5.2) formal jacking
Please refer to fig. 14, after the trial jacking meets the requirement, beginning formal jacking, wherein in the jacking process, the allowable error value of the jacking height of each jacking point is 0.5-1/1000 of the longitudinal distance between the jacking point positions and is not more than 30mm, the jacking rate is 28-32 mm/min, 3-3 standard knots are additionally arranged for each set standard height of the combined steel structure when jacking, each standard height needs to be stabilized, a layer of inverted guy rope 4 is additionally arranged for each jacking height, the upper end of the inverted guy rope 4 is connected with the lower chord ball of the net rack, the lower end of the inverted guy rope is connected with the jacking frame, and when the combined steel structure is jacked to the position 300-350 mm above the positioning height, the combined steel structure and the floor are firmly tied by using the positioning guy rope 5.
The initial section and each stage of standard section are respectively in a split connection structure, the bottoms of the initial section and each stage of standard section are connected by a connecting plate, when the telescopic rod of the jack extends out of the jack, the top supporting plate jacks the connection parts of the two sections at the bottom of the jack frame, and when the telescopic rod of the jack retracts and falls, the top supporting plate passes through the hollow structure in the jack frame.
3.6) carry out the benefit of rack support position ball and its connecting rod piece and piece the installation, the rack benefit pieces the installation and accomplishes the back, carries out the whole of built-up steel structure and assembles the acceptance, and after the acceptance is qualified, the whole fall back of jacking support, and the built-up steel structure is fallen and is put to taking one's place on the support of permanent structure steel column 6 to the welding demolishs the jacking frame, and the built-up steel construction is accomplished. In order to ensure the safety of the patching construction, in the patching process, a lift truck is used for personnel high-altitude operation, the auxiliary cooperation of a crane is used for patching installation, after all patching operations are finished, because rod pieces and balls at patching positions are main stress points, 100% flaw detection nondestructive testing of a third party is required, and after all point positions are qualified, the net rack can fall back integrally.
The combined jacking frame is adopted to realize integral synchronous jacking of the combined steel structure, the height difference of the initial section of the jacking frame is adapted to the slope difference of the combined steel structure, and the combined jacking frame is adopted.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (10)

1. The integral synchronous jacking equipment for the large-span combined type overweight eccentric slope angle steel structure is characterized by comprising a plurality of jacking units, wherein the jacking units are arranged on a plurality of jacking foundations in a one-to-one correspondence manner, and the jacking foundations are arranged on a terrace; each jacking unit comprises a cross joist and a jacking frame which are coaxially arranged from top to bottom in sequence, and the jacking frame is jacked by a jack;
the jacking frame comprises a jacking support, an initial section, a multi-stage standard section and a base which are coaxially arranged from top to bottom in sequence;
the initial section and each level of standard section are in split connection structure, and the bottoms are connected by a connecting plate;
the jack is fixedly arranged on the base, and a telescopic rod of the jack is connected with a universal jack supporting plate;
when the telescopic rod of the jack extends out, the universal jack supporting plate jacks the connection parts of the two sections at the lowest part of the jacking frame, the telescopic rod of the jack retracts after rotating, and when the telescopic rod retracts, the universal jack supporting plate descends in a hollow structure in the jacking frame;
the top of the jacking support is provided with a jacking ball support, the bottom of the cross joist is provided with a hemispherical hinged support matched with the jacking ball support, and a net rack upper chord ball support fixedly connected with the cantilever end of the cross joist is arranged above the cantilever end of the cross joist;
the heights of the bottom surfaces of the initial sections of the jacking frames of all the jacking units from the terrace are the same, and the top surfaces of the jacking frames are leveled along the gradient of the net rack;
the jacking frame is tied with the combined steel structure through an inverted guy cable, and the combined steel structure is tied with the jacking foundation through an in-position guy cable;
the jacking force of all the jacking unit jacks is different and is determined according to the design value.
2. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein the universal jacking plate is sleeved on a jack cap head, the jack cap head is buckled on a jack cap head rod, the jack cap head rod and the jack cap head rod form a spherical hinge connection, and the jack cap head rod is coaxially and fixedly connected with a telescopic rod of the jack.
3. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 2, wherein the jack cap rod is in threaded connection with the telescopic rod of the jack.
4. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 3, wherein an adjusting handle vertical to the jack cap rod is fixedly connected to the jack cap rod.
5. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein the hemispherical hinge support is provided with a gusset plate fixedly connected with the bottom of the cross joist and a hemispherical structure fixedly connected below the gusset plate and matched with the jacking spherical support.
6. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein the jacking ball support and the net rack upper chord ball support are the same in structure, a bottom plate is arranged, a central pipe column is arranged on the bottom plate, a plurality of wing plates which are fixedly connected with the central pipe column and are uniformly distributed along the circumferential direction are arranged around the central pipe column, the bottom edges of the wing plates are fixedly connected with the bottom plate, and the top edges of all the wing plates and the top of the central pipe column form a spherical crown structure which is matched with the spherical shape of the jacking.
7. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein the jacking ball support and the net rack upper chord ball support are the same in structure, a bottom plate is arranged, an inner pipe column is fixedly connected to the center of the bottom plate, an outer pipe column is sleeved outside the inner pipe column, the outer pipe column is freely placed on the bottom plate, the inner pipe column is lower than the outer pipe column and supports the same spherical component together, surface sand bodies for supporting the spherical component are filled in annular spaces between the inner pipe column and the inner and outer pipe columns, a sand outlet is arranged at the bottom of the outer pipe column, and a gate is arranged on the sand outlet.
8. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein a diagonal gusset plate fixedly connected with the intersection of the cross joist is arranged above the cross joist, a supporting upright rod is fixedly connected to the diagonal gusset plate, and a diagonal draw bar is respectively arranged between the supporting upright rod and four cantilever beams of the cross joist.
9. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 8, wherein the cantilever beam of the cross joist is welded by H-shaped steel, a bottom gusset is welded on each of two sides of an upper wing plate at the cantilever end of the cross joist, reinforcing ribs are arranged on each of two sides of a web plate at the cantilever end of the cross joist, the top edges of the reinforcing ribs are connected with the corresponding bottom gusset and the corresponding upper wing plate, and the bottom edges of the reinforcing ribs are connected with the corresponding lower wing plate.
10. The large-span combined type overweight eccentric slope angle steel structure integral synchronous jacking equipment as claimed in claim 1, wherein the base is provided with a m-shaped supporting structure, and the m-shaped supporting structure is welded inside the rectangular frame.
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CN206646835U (en) * 2017-03-31 2017-11-17 中冶建工集团有限公司 It is a kind of from hoisting type steel structure slipping measure support
CN107386658A (en) * 2017-03-20 2017-11-24 广州珠江工程建设监理有限公司 A kind of construction method of large steel net frame integral hoisting platform
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JPH0280765A (en) * 1988-09-14 1990-03-20 Ohbayashi Corp Lateral drawing method
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CN107386658A (en) * 2017-03-20 2017-11-24 广州珠江工程建设监理有限公司 A kind of construction method of large steel net frame integral hoisting platform
CN206646835U (en) * 2017-03-31 2017-11-17 中冶建工集团有限公司 It is a kind of from hoisting type steel structure slipping measure support
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