CN112144725A - Cable dome structure with limited installation space and forming method thereof - Google Patents
Cable dome structure with limited installation space and forming method thereof Download PDFInfo
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
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- 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
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- 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
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- E04B2001/3583—Extraordinary methods of construction, e.g. lift-slab, jack-block using permanent tensioning means, e.g. cables or rods, to assemble or rigidify structures (not pre- or poststressing concrete), e.g. by tying them around the structure
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Abstract
The invention discloses a cable dome structure with limited installation space and a forming method thereof, wherein the inner side of the cable dome is a Geiger-type cable system part, the outermost ring of the cable dome structure is a Levy-type cable system part, the cable dome structure with limited installation space comprises a central pulled ring, a ridge cable, an inclined cable, an annular cable, a stay bar and an outer ring pressure ring boundary component, the ridge cable, the inclined cable and the annular cable are respectively composed of a plurality of rings, and each ring of annular cable is composed of a single steel cable or a plurality of steel cables in parallel; the inner side of the Levy type cable system part is connected with the Geiger type cable system part through an inner ridge cable connecting node, an outer ring circumferential cable clamp node and the outer side of the Levy type cable system part is directly connected with an outer ring pressure ring boundary component through an outer ridge cable and an outer oblique cable. The invention is suitable for construction sites of full-flexible cable dome structure systems with limited installation space.
Description
Technical Field
The invention relates to the field of cable dome structures in large-span space structures, in particular to a cable dome structure with limited installation space and a forming method thereof.
Background
The cable dome structure is one of large-span prestressed steel structure systems, is a full tension System (tension System) with extremely high structural efficiency, and is designed and developed by American engineers D.H.Geiger according to the tension integral structure idea. The cable dome structure is a novel prestressed space structure system mainly composed of cables, rods and a roof covering material (generally a membrane material). Except that a few rod pieces are pressed, the other rod pieces are in a tension state, and the system is a full-tension system with reasonable stress and extremely high structural efficiency. The structure is ingenious in conception, light in appearance, light in self weight, rapid in construction, material-saving and environment-friendly, so that the building block has strong vitality and wide application prospect and represents the highest level of the development of the current international space structure. International engineering examples of cable domes include two main types: levy-type cable domes and Geiger-type cable domes.
The rigidity of the cable dome structure is provided by the balance pretension between the tension unit and the compression unit, the system has almost no rigidity before the pretension is applied, and the size of the initial pretension plays a determining role in the appearance of the system and the rigidity of the structure, so that the tension forming process analysis of the cable dome structure becomes a key problem of the system. However, at present, no mature construction technology exists for cable dome structures with large span and complicated field construction conditions, particularly cable dome structures with limited installation space.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
An object of the present invention is to provide a cable dome structure with a limited installation space and a method of forming the same, which can solve the above-mentioned problems of the prior art.
In order to achieve the above purpose, the invention provides a cable dome structure with a limited installation space, wherein the inner side of the cable dome structure is a Geiger-type cable system part, the outermost ring of the cable dome structure is a Levy-type cable system part, and an upper layer of ridge cables are prevented from being lifted from the ground in the structure, so that the cable dome structure with the limited installation space comprises a central pulled ring, a ridge cable, oblique cables, circumferential cables, a strut bar and an outer ring pressure ring boundary member, the ridge cable comprises a plurality of outer ridge cables and inner ridge cables, the oblique cables comprise a plurality of outer oblique cables, inner oblique cables and upper oblique cables, the circumferential cables comprise an outer ring circumferential cable, a middle ring circumferential cable and an inner ring circumferential cable, and the circumferential cables are subjected to circumferential cable force side by a single steel cable or; the inner side of the Levy type cable system part is connected with the Geiger type cable system part through an inner ridge cable connecting node, an outer ring circumferential cable clamp node and an outer side of the Levy type cable system part, and the outer side of the Levy type cable system part is directly connected with an outer ring pressure ring boundary member through an outer ridge cable and an outer oblique cable; and wherein, the inner ridge cable and the outer ridge cable form an upper layer cable system, the plurality of inclined cables and the plurality of circumferential cables form a lower layer cable system, the inner ridge cable is directly connected with the central tension ring through a pin shaft and is connected with the central tension ring through the upper inclined cables, the lower layer cable system is connected with the upper layer cable system through circumferential cable clamp nodes, support rods and inclined cables, and the inner ring circumferential cable of the lower layer cable system is connected with the central tension ring through an inner ring circumferential cable clamp node and an inner ring straight cable.
In a preferred embodiment, the inner ring circumferential cables are formed by connecting two sections, the middle ring circumferential cables are formed by connecting four sections, and the outer ring circumferential cables are formed by connecting eight sections.
In a preferred embodiment, the outer ring pressure ring boundary embedded part is connected to the outer ring pressure ring boundary component, the outer ring pressure ring boundary embedded part has two forms, wherein two lug plates are arranged on a bottom plate of the outer ring pressure ring boundary embedded part I, each lug plate is provided with an outer ridge cable connecting part and an outer oblique cable connecting part which are respectively used for connecting an outer ridge cable and an outer oblique cable, and a bottom plate of the outer ring pressure ring boundary embedded part II is provided with one lug plate.
In a preferred embodiment, the circumferential cable clamp node includes an outer ring circumferential cable clamp node, a middle ring circumferential cable clamp node and an inner ring circumferential cable clamp node, wherein the outer ring circumferential cable clamp node includes a first outer ring circumferential cable clamp node and a second outer ring circumferential cable clamp node, the first outer ring circumferential cable clamp node includes two outer stay cable connecting portions and four outer ring circumferential cable head connecting portions, and the first outer ring circumferential cable clamp node further includes a stay rod connecting portion, the second outer ring circumferential cable clamp node includes two outer stay cable connecting portions, and the second outer ring circumferential cable clamp node further includes a stay rod connecting portion and an outer ring circumferential cable cableway connecting portion.
In a preferred embodiment, the inner ring circumferential cable clamp node comprises a first inner ring circumferential cable clamp node and a second inner ring circumferential cable clamp node, wherein the first inner ring circumferential cable clamp node comprises an inner oblique cable connecting part, a strut connecting part and an inner ring circumferential cable way connecting part, the second inner ring circumferential cable clamp node comprises an inner oblique cable connecting part, a strut connecting part, an inner ring straight cable connecting part and an inner ring circumferential cable way connecting part, and the inner oblique cable connecting part and the straight cable connecting part are respectively positioned at two sides of the strut connecting part; the middle ring circumferential cable clamp node comprises an inner oblique cable connecting part, a stay bar connecting part and a middle ring circumferential cable cableway connecting part.
In a preferred embodiment, a plurality of inner ridge cable connecting parts are circumferentially and symmetrically arranged on the upper part of the central pull receiving ring, a plurality of upper oblique cable connecting parts are circumferentially and symmetrically arranged on the middle part of the central pull receiving ring, and a plurality of inner ring straight cable connecting parts are circumferentially and symmetrically arranged on the lower part of the central pull receiving ring.
The invention also provides a molding method of the cable dome structure with limited installation space, which comprises the following steps:
s1, determining a mode of assembling a central pull ring by a jig frame according to the stress characteristics of a cable dome structure, installing ridge cables, oblique cables and annular cable members in a partitioning manner by analyzing and comparing advantages, disadvantages and feasibility of various methods for applying prestress of steel cables, and establishing prestress by selecting a mode of tensioning outer oblique cables for one-step molding;
s2, establishing an integral structure calculation model of the cable dome structure, performing simulation analysis at each construction stage to give the position and stress of the cable dome structure at each construction stage and determine the cable length of the steel cable, performing three-dimensional model lofting at a key construction stage, and accurately simulating the position of each main component in the construction stage;
s3, erecting an assembling jig frame in the center of a construction site, and assembling the cable dome structure, wherein the assembling of the cable dome structure comprises the following steps:
s31, assembling a central pull-on ring on a jig frame, and symmetrically installing ridge cables in batches, wherein the height of the jig frame and the accurate adjustment amount of inner ridge cables are determined by the simulation analysis result of the step S2, part of outer ridge cables are subjected to preliminary adjustment, the rest outer ridge cables are subjected to accurate adjustment, and the adjustment amount of the part of outer ridge cables subjected to preliminary adjustment is determined by the simulation analysis result of the step S2;
s32, assembling each ring of circumferential cables and oblique cables, installing circumferential cable clamp nodes, lifting the circumferential cables to enable the circumferential cable clamp nodes to be connected with the lower ends of the support rods connected with the ridge cables in the high altitude, and accurately adjusting the cable lengths of the circumferential cables and the oblique cables in the outer rings according to the simulation analysis result of the step S2;
s33, connecting the outermost oblique cables with the outer ring beam through the tooling cables and the lifting device, lifting the outer oblique cables by using the lifting device, and lifting the outer oblique cables to the lengths in corresponding states according to the simulation analysis result of the step S2;
s34, unfolding and assembling the residual annular cables and the residual inhaul cables so as to complete the assembly of the whole cable dome structure;
s4, according to the simulation analysis result of the step S2, tensioning part of the outer ridge cable which is subjected to preliminary adjustment firstly, accurately adjusting the cable length of the preliminarily adjusted outer ridge cable to a designed length, then forming the cable dome structure at one time by a method of lifting and tensioning the outer oblique cable, and completing the lifting and tensioning process in an integral or batch synchronous mode;
and S5, detaching the jig frame after the center is automatically separated from the supporting jig frame by the pull ring, and finishing construction.
In a preferred embodiment, the step S32 of precisely adjusting the cable length of the outer-ring stay is to determine the precise adjustment amount of the outer stay by combining the simulation calculation result in the step S2, the machining error of the outer stay, and the machining and installation error of the outer ring beam of the roof; in the step S4, the cable length of the preliminarily adjusted outer ridge cable is accurately adjusted by integrating the processing error of the outer ridge cable and the processing and mounting error of the peripheral structure of the roof on the basis of the determined preliminary adjustment amount of the cable length of the outer ridge cable, so as to determine the accurate adjustment amount of each outer ridge cable.
In a preferred embodiment, the outer ridge cable and the outer oblique cable are provided with cable adjusting screws, and the precise adjustment of the cable length in the step S4 is to precisely control the cable length of the cable by using the tension value and check the in-out amount of the cable adjusting screw.
In a preferred embodiment, the deviation between the actual value of the outer oblique cable force in the stretch-formed cable dome structure and the calculated value of the cable force in the simulation analysis structure of step S2 is within ± 10%.
Compared with the prior art, the cable dome structure with limited installation space and the forming method thereof have the following beneficial effects: the cable dome structure is a combination of a Geiger-type cable dome structure and a Levy-type cable dome structure, so that the cable dome structure has the advantages of simple Geiger-type structure and strong Levy-type torsion resistance, and has the basic characteristics of the cable dome. Except that a few rod pieces are pressed in the cable dome structure system, the other rod pieces are in a tension state, and the cable dome structure system is a full-tension system which is reasonable in stress and extremely high in structural efficiency. The cable dome structure has the integral structure formed by cable systems, and the steel consumption is greatly reduced. And the deviation between the actual value of the cable force of the inclined cable and the calculated value of the stress in the cable dome structure after stretch forming is controlled within +/-10%.
Drawings
Fig. 1 is a schematic structural view of a cable dome according to a preferred embodiment of the present invention.
Fig. 2 is a partial (quarter) schematic view of fig. 1.
Fig. 3A is a schematic structural diagram of a first peripheral embedded part of the outer ring pressure ring.
Fig. 3B is a schematic structural view of the second outer ring pressure ring boundary embedded part.
Fig. 4 is a schematic structural view of a central pull tab.
Fig. 5A is a schematic structural diagram of an inner chordal node.
Fig. 5B is a schematic structural view of the inner and outer chordae connecting node.
Fig. 6A is a schematic view of a first inner ring circumferential cord node.
Fig. 6B is a schematic view of a second inner ring circumferential cord node.
Fig. 7 is a schematic diagram of a mid-hoop cable node.
Fig. 8A is a schematic view of a first outer ring circumferential cord node.
Fig. 8B is a schematic diagram of a second outer hoop funicular node.
Fig. 9A is a schematic view of a sectional butt joint form of the circumferential cables of the outer ring.
Fig. 9B is a schematic view of a sectional butt joint form of the middle ring circumferential cables.
Fig. 9C is a schematic view of the segmented butt joint of the inner ring circumferential cables.
Description of reference numerals:
1, Levy type tether portion; 2, a Geiger-type tether portion; 3, pulling a ring at the center; 4, inner ring straight cables; 5, an outer ring circumferential cable; 6, a middle ring is a circumferential cable; 7, an inner ring circumferential cable; 8, an upper oblique cable; 9, an outer ring pressure ring boundary member; 10, an outer spinal chord; 11, an outer oblique cable; 12, spinal cord; 13, an inner oblique cable; 14, a stay bar; 15, embedding a first part at the boundary of the outer ring pressure ring; 16, embedding a second part at the boundary of the outer ring pressure ring; 17, a first outer ring circumferential cable node; 18, a second outer ring circumferential cable node; 19, a middle ring circumferential cable node; 20, a first inner ring circumferential cable node; 21, a second inner ring circumferential cable node; 22, an internal spinal cord node; 23, connecting the inner and outer ridge cables with nodes; 24, an outer ring circumferential cable is in a sectional butt joint mode; 25, a middle ring circumferential cable is in a sectional butt joint mode; 26, the inner ring is in a segmented butt joint mode.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work, belong to the scope of protection of the present invention.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
As shown in fig. 1 to 9C, the present invention provides a cable dome structure with a limited installation space, which is constructed in the form of a combination of Levy-type and Geiger-type cable portions 2 at the inner side and Levy-type cable portions 1 at the outermost ring. The cable dome structure comprises a central pull ring 3, ridge cables, oblique cables, annular cables, a support rod 14 and an outer ring pressure ring boundary component 9, wherein the ridge cables comprise a plurality of outer ridge cables 10 and inner ridge cables 12, the oblique cables comprise a plurality of outer oblique cables 11, inner oblique cables 13 and upper oblique cables 8, the annular cables comprise outer ring annular cables 5, middle ring annular cables 6 and inner ring annular cables 7, and the annular cables bear annular cable force by a single steel cable or a plurality of steel cables side by side. The inner side of the Levy type cable system part 1 is connected with the Geiger type cable system part 2 through an inner ridge cable connecting node 23, an outer ring circumferential cable clamp node and the outer side of the Levy type cable system part 2 is directly connected with the outer ring pressure ring boundary component 9 through an outer ridge cable 10 and an outer oblique cable 11. And wherein, the inner ridge cable 12 and the outer ridge cable 10 form an upper layer cable system, a plurality of inclined cables and a plurality of annular cables form a lower layer cable system, the inner ridge cable 12 is directly connected with the central pull-on ring 3 through a pin shaft and is connected with the central pull-on ring 3 through an upper inclined cable 8, the lower layer cable system is connected with the upper layer cable system through an annular cable clamp node, a support rod 14 and an inclined cable, and an inner ring annular cable 7 of the lower layer cable system is connected with the central pull-on ring 3 through an inner ring annular cable clamp node and an inner ring straight cable 4.
In a preferred embodiment, as shown in fig. 9C, the inner circumferential cord 7 is connected in two segments to form a set of inner circumferential cord segment abutments 26. As shown in fig. 9B, the middle ring circumferential cables 6 are connected in four segments to form two groups of middle ring circumferential cable segment butt-joint structures 25, and as shown in fig. 9A, the outer ring circumferential cables 5 are connected in eight segments to form four groups of outer ring circumferential cable segment butt-joint structures 24.
The cable dome structure with limited installation space is a combination of a Levy type cable system and a Geiger type cable system, and the cable structure not only inherits the advantage of simple structure of the Geiger type cable system, but also inherits the advantages of good structural stability and strong capability of resisting non-uniform load action of the Levy type cable system. The boundary constraint condition of the whole structure is saddle shape, the space span is large, and the plane projection is oval, which increases the complexity of the structure and the difficulty of construction. Meanwhile, the above reasons also cause more node styles and complex structures. But the whole system is stressed reasonably, the structural efficiency is extremely high, the steel amount for engineering is greatly reduced, and the whole roof structure is light, beautiful, transparent and beautiful. The initial stiffness is zero before the prestressing is not applied, and is a mechanism rather than a structure that has stiffness after the appropriate prestressing has been applied. In a loading state, the stiffened ridge cable is equivalent to an arch, so that the force acting on the dome is transmitted to the ring beam or the ring truss from the ridge cable and transmitted to the lower ring cable from the stay bar respectively, and the lower ring cable and the oblique cable form an underslung cable system to be a main bearing structure, so that the step of applying prestress to the oblique cable is the key of the whole structure system forming.
Example 2
In a preferred embodiment, an outer ring pressure ring boundary embedded part is connected to the outer ring pressure ring boundary member 9, and the outer ring pressure ring boundary embedded part has two forms, including an outer ring pressure ring boundary embedded part one 91 and an outer ring pressure ring boundary embedded part two 92. As shown in fig. 3A, two lug plates 912 are disposed on a bottom plate 911 of the first outer ring pressure ring boundary embedded part 91, and each lug plate 912 is provided with an outer ridge cable connection part 913 and an outer oblique cable connection part 914 for connecting the outer ridge cable 10 and the outer oblique cable 11, respectively. A plurality of ring beam construction plates 915 are vertically disposed on the bottom plate 911. As shown in fig. 3B, an ear plate 922 is disposed on the bottom plate 921 of the second outer ring pressure ring boundary embedded part 92. The structure of the lug plate 922 of the outer ring pressure ring boundary embedded piece II 92 is the same as that of the lug plate 912 of the outer ring pressure ring boundary embedded piece I91, and an outer ridge cable connecting part 923 and an outer oblique cable connecting part 924 are arranged on the lug plate 922 of the outer ring pressure ring boundary embedded piece II 92.
In a preferred embodiment, the circumferential cable clamp nodes include an outer ring circumferential cable clamp node, a middle ring circumferential cable clamp node, and an inner ring circumferential cable clamp node. The outer ring circumferential cable clamp node comprises a first outer ring circumferential cable clamp node 17 and a second outer ring circumferential cable clamp node 18. As shown in fig. 8A-8B, the first outer ring circumferential cable clamp node 17 includes two outer oblique cable connecting portions 171 and four sets of outer ring circumferential cable head connecting portions 172, and the first outer ring circumferential cable clamp node 17 further includes a strut connecting portion 173. The second outer hoop cable clamp node 18 includes two outer stay connection portions 181, and the second outer hoop cable clamp node 18 further includes a strut connection portion 182 and an outer hoop cable way connection portion 183.
In a preferred embodiment, as shown in fig. 6A-6B, the inner ring circumferential cleat node includes a first inner ring circumferential cleat node 20 and a second inner ring circumferential cleat node 21, wherein the first inner ring circumferential cleat node 20 includes an inner sprag connection portion 201, a strut connection portion 202, and an inner ring circumferential cableway connection portion 203, and the second inner ring circumferential cleat node 21 includes an inner sprag connection portion 211, a strut connection portion 212, an inner ring straight cable connection portion 213, and an inner ring circumferential cableway connection portion 214, wherein the inner sprag connection portion 211 and the straight cable connection portion 213 of the second inner ring circumferential cleat node 21 are located on both sides of the strut connection portion 212, respectively. The mid-hoop cable clamp node 19 includes an inner stay connection 191, a strut connection 192, and a mid-hoop cable way connection 193.
In a preferred embodiment, as shown in fig. 4, a plurality of inner ridge cable connecting portions 31 are circumferentially and symmetrically provided on the upper portion of the center pull-receiving ring 3, a plurality of upper oblique cable connecting portions 32 are circumferentially and symmetrically provided on the middle portion of the center pull-receiving ring 3, and a plurality of inner ring straight cable connecting portions 33 are circumferentially and symmetrically provided on the lower portion of the center pull-receiving ring 3.
In a preferred embodiment, as shown in fig. 5A-5B, the inner ridge cord node 22 is provided with an inner wire connecting portion 221, an inner wire connecting portion 222, another inner wire connecting portion 223 and a brace connecting portion 224 for connecting the inner wire 13, the inner ridge cord 12 and the brace 14, respectively. The inner and outer ridge cable connection nodes 23 are provided with an inner stay cable connection part 221, an inner ridge cable connection part 221, two outer ridge cable connection parts 223, and a stay bar connection part 224.
Example 3
The invention also provides a method for forming the cable dome structure with limited installation space, which comprises the following steps:
s1, according to the stress characteristics of the cable dome structure, determining the mode of assembling a central pull ring by a jig frame, installing ridge cables, oblique cables and annular cable members in a partitioning manner by analyzing and comparing advantages, disadvantages and feasibility of various methods for applying prestress of steel cables, and establishing prestress by selecting a mode of tensioning outer oblique cables for one-step forming.
S2, establishing an integral structure calculation model of the cable dome structure, carrying out simulation analysis in each construction stage to give the position and stress of the cable dome structure in each construction stage and determine the cable length of the steel cable, carrying out three-dimensional model lofting on the key construction stage, and accurately simulating the position of each main component in the construction stage. Preferably, the simulation analysis in step S2 is performed by using finite element analysis software, which is not listed here. The construction stage includes four stages of construction early-stage technical preparation, structure installation, cable length adjustment of a cable, and tension forming, where step S2 can be regarded as the stage of construction early-stage technical preparation. The three-dimensional model in step S2 is implemented by using zhongwang CAD drawing software, but may be implemented by using other drawing software meeting the requirements, which is not listed here.
Step S3, considering the factor of construction space limitation, the whole cable system conflicts with the floor plate in the forming process, and the mode of ground assembly and integral lifting cannot be adopted, namely after the upper layer ridge cable on the same axis is assembled, the cable system is directly installed in place from the ground lifting due to the fact that the space is provided with obstacles to prevent the cable system from being directly installed in place, and therefore the cable dome structure is assembled in the mode that an assembling jig frame is erected in the center of a construction site. The assembling of the cable dome structure comprises the following steps:
s31, assembling central pull rings on the jig frame, and symmetrically installing the ridge cables in batches, wherein the height of the jig frame is determined by the simulation analysis result of the step S2. The height of the jig frame can be directly controlled by installing the upper layer cable system according to the simulation analysis result of the step S2, and enough space is ensured at the lower part for constructing the lower layer cable system. And controlling the height of the jig frame according to the simulation analysis result of the step S2 on the principle that the maximum number of upper-layer ridge cables can be easily installed on the outer ring beam at the designed length, assembling the central pull ring on the jig frame, and reinforcing the central pull ring by using a cable rope. According to the simulation analysis result of the step S2, the ridge cables are symmetrically installed in batches, so that the influence of pull ring displacement and large horizontal force of a jig frame caused by unbalanced installation force of a cable system structure in the construction process can be reduced. When the ridge cable is installed, in order to reduce the load of installing the ridge cable, the adjustment amount of the individual ridge cable is loosened. The jig height and the accurate adjustment amount of the inner spinal cord are determined by the simulation analysis result of step S2, a part of the outer spinal cords are primarily adjusted (i.e., loosened), the remaining outer spinal cords are accurately adjusted, and the adjustment amount is determined by the simulation analysis result of step S2.
S32, unfolding and assembling each ring of circumferential cables and oblique cables on a field or a stand, installing circumferential cable clamp nodes, lifting the circumferential cables to enable the circumferential cable clamp nodes to be connected with the lower ends of the support rods connected with the ridge cables in high altitude, and accurately adjusting the cable lengths of the circumferential cables and the oblique cables of the outer ring according to the simulation analysis result of the step S2.
And S33, connecting the outermost oblique cable with the outer ring beam through the tooling cable and the lifting device, lifting the outer oblique cable by using the lifting device, and lifting the outer oblique cable to the longest length in the corresponding state according to the simulation analysis result of the step S2.
S34, unfolding and assembling the residual annular cables and the residual inhaul cables so as to complete the assembly of the whole cable dome structure.
S4, according to the simulation analysis result of the step S2, firstly tensioning the preliminarily adjusted part of the outer ridge cables, accurately adjusting the cable lengths of the outer ridge cables to the designed length, then forming the cable dome structure at one time by a method of lifting and tensioning the outer oblique cables, and completing the lifting and tensioning process in an integral or batch synchronous mode. In the lifting and tensioning process, the cable force of the stay cable is used as a main control principle, and the structure configuration is used as an auxiliary control principle, and the cable force of the stay cable is finely adjusted according to the actual situation on site so that the structure configuration is within an acceptable range. Here, step S4 can be regarded as a stage of stretch forming.
And S5, detaching the jig frame after the center is automatically separated from the supporting jig frame by the pull ring, and finishing construction.
In a preferred embodiment, the inner and outer cords are assembled directly through the inner and outer cord connection nodes and mounted on the outer ring pressure ring boundary member with minimal lifting force, based on the height of the jig determined in step S2.
In a preferred embodiment, the step S32 of precisely adjusting the cable length of the outer oblique cable is to determine the precise adjustment amount of the outer oblique cable by combining the simulation calculation result in the step S2, the machining error of the outer oblique cable and the machining and installation error of the peripheral ring beam of the roof. Preferably, in order to ensure the quality of the node, the node must be subjected to rust prevention treatment. In the step S4, the cable length of the preliminarily adjusted outer ridge cable is accurately adjusted by integrating the processing error of the outer ridge cable and the processing and mounting error of the peripheral structure of the roof on the basis of the determined preliminary adjustment amount of the cable length of the outer ridge cable, so as to determine the accurate adjustment amount of each outer ridge cable.
In a preferred embodiment, the outer ridge cable and the outer oblique cable are provided with cable adjusting screws, when the cable length of the cable is accurately adjusted, the cable length of the cable is accurately controlled by using the tensioning value, and the in-out amount of the cable adjusting screws is checked, so that the adjustment effect and the accuracy of the cable length of the cable are ensured.
In a preferred embodiment, the deviation between the actual value of the outer oblique cable force in the stretch-formed cable dome structure and the calculated value of the cable force in the simulation analysis structure of step S2 is within ± 10%.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A cable dome structure with limited installation space, characterized in that: the inner side of the cable dome structure with the limited installation space is a Geiger-type cable system part, the outermost ring of the cable dome structure with the limited installation space is a Levy-type cable system part, the cable dome structure with the limited installation space comprises a central pull ring, a ridge cable, oblique cables, circumferential cables, a stay bar and an outer ring pressure ring boundary component, the ridge cable comprises a plurality of outer ridge cables and inner ridge cables, the oblique cables comprise a plurality of outer oblique cables, inner oblique cables and upper oblique cables, the circumferential cables comprise an outer ring circumferential cable, a middle ring circumferential cable and an inner ring circumferential cable, and the circumferential cables are subjected to circumferential cable force by a single steel cable or a plurality of steel cables in parallel;
the inner side of the Levy type cable system part is connected with the Geiger type cable system part through an inner ridge cable connecting node, an outer ring circumferential cable clamp node and an outer side of the Levy type cable system part, and the outer side of the Levy type cable system part is directly connected with an outer ring pressure ring boundary component through the outer ridge cable and the outer oblique cable;
and wherein, the inner ridge cable and the outer ridge cable form an upper layer cable system, the plurality of inclined cables and the plurality of annular cables form a lower layer cable system, the inner ridge cable is directly connected with the central tension ring through a pin shaft and is connected with the central tension ring through the upper inclined cables, the lower layer cable system is connected with the upper layer cable system through annular cable clamp nodes, support rods and inclined cables, and inner ring annular cables of the lower layer cable system are connected with the central tension ring through inner ring annular cable clamp nodes and inner ring straight cables.
2. The cable dome structure of claim 1, wherein: the inner ring circumferential cable is formed by connecting two sections, the middle ring circumferential cable is formed by connecting four sections, and the outer ring circumferential cable is formed by connecting eight sections.
3. The cable dome structure of claim 1, wherein: the outer ring pressure ring boundary embedded part is connected to the outer ring pressure ring boundary component, the outer ring pressure ring boundary embedded part has two forms, wherein two lug plates are arranged on a base plate of the outer ring pressure ring boundary embedded part I, an outer ridge cable connecting part and an outer oblique cable connecting part are arranged on each lug plate and are respectively used for connecting the outer ridge cable and the outer oblique cable, and a lug plate is arranged on a base plate of the outer ring pressure ring boundary embedded part II.
4. The cable dome structure of claim 2, wherein: the hoop cable clamp node comprises an outer ring hoop cable clamp node, a middle ring hoop cable clamp node and an inner ring hoop cable clamp node, wherein the outer ring hoop cable clamp node comprises a first outer ring hoop cable clamp node and a second outer ring hoop cable clamp node, the first outer ring hoop cable clamp node comprises two outer oblique cable connecting parts and four outer ring hoop cable head connecting parts, the first outer ring hoop cable clamp node further comprises a stay bar connecting part, the second outer ring hoop cable clamp node comprises two outer oblique cable connecting parts, and the second outer ring hoop cable clamp node further comprises a stay bar connecting part and an outer ring hoop cable way connecting part.
5. The cable dome structure with limited installation space of claim 4, wherein: the inner ring circumferential cable clamp node comprises a first inner ring circumferential cable clamp node and a second inner ring circumferential cable clamp node, wherein the first inner ring circumferential cable clamp node comprises an inner oblique cable connecting part, a stay bar connecting part and an inner ring circumferential cable way connecting part, the second inner ring circumferential cable clamp node comprises an inner oblique cable connecting part, a stay bar connecting part, an inner ring straight cable connecting part and an inner ring circumferential cable way connecting part, and the inner oblique cable connecting part and the straight cable connecting part are respectively positioned on two sides of the stay bar connecting part; the middle ring circumferential cable clamp node comprises an inner oblique cable connecting part, a stay bar connecting part and a middle ring circumferential cable cableway connecting part.
6. The cable dome structure of claim 5, wherein: the pull ring is characterized in that a plurality of inner ridge cable connecting parts are symmetrically arranged on the upper portion of the central pull ring at intervals along the circumferential direction, a plurality of upper oblique cable connecting parts are symmetrically arranged on the middle portion of the central pull ring at intervals along the circumferential direction, and a plurality of inner ring straight cable connecting parts are symmetrically arranged on the lower portion of the central pull ring at intervals along the circumferential direction.
7. A method of forming a cable dome structure having a limited installation space according to any one of claims 1 to 6, wherein: the molding method comprises the following steps:
s1, determining a mode of assembling a central pull ring by a jig frame according to the stress characteristics of a cable dome structure, installing ridge cables, oblique cables and annular cable members in a partitioning manner by analyzing and comparing advantages, disadvantages and feasibility of various methods for applying prestress of steel cables, and establishing prestress by selecting a mode of tensioning outer oblique cables for one-step molding;
s2, establishing an integral structure calculation model of the cable dome structure, performing simulation analysis in each construction stage to give the position and stress of the cable dome structure in each construction stage and determine the cable length of the steel cable, performing three-dimensional model lofting on a key construction stage, and accurately simulating the position of each main component in the construction stage;
s3, erecting an assembling jig frame in the center of a construction site, and assembling the cable dome structure, wherein the assembling of the cable dome structure comprises the following steps:
s31, assembling the central pull-receiving ring on a jig frame, and symmetrically installing ridge cables in batches, wherein the height of the jig frame and the accurate adjustment amount of the inner ridge cables are determined by the simulation analysis result of the step S2, part of the outer ridge cables are primarily adjusted, the rest of the outer ridge cables are accurately adjusted, and the adjustment amount is determined by the simulation analysis result of the step S2;
s32, assembling each ring of circumferential cables and oblique cables, installing circumferential cable clamp nodes, lifting the circumferential cables to enable the circumferential cable clamp nodes to be connected with the lower ends of the support rods connected with the ridge cables in the high altitude, and accurately adjusting the cable lengths of the circumferential cables and the oblique cables in the outer rings according to the simulation analysis result of the step S2;
s33, connecting the outermost oblique cables with the outer ring beam through the tooling cables and the lifting device, lifting the outer oblique cables by using the lifting device, and lifting the outer oblique cables to the lengths in corresponding states according to the simulation analysis result of the step S2;
s34, unfolding and assembling the residual annular cables and the residual inhaul cables so as to complete the assembly of the whole cable dome structure;
s4, according to the simulation analysis result of the step S2, tensioning part of the outer ridge cable which is subjected to preliminary adjustment firstly, accurately adjusting the cable length of the preliminarily adjusted outer ridge cable to a designed length, then forming the cable dome structure at one time by a method of lifting and tensioning the outer oblique cable, and completing the lifting and tensioning process in an integral or batch synchronous mode;
and S5, detaching the jig frame after the center is automatically separated from the supporting jig frame by the pull ring, and finishing construction.
8. The molding method according to claim 7, wherein: the step S32 of precisely adjusting the cable length of the outer-ring oblique cable is to determine the precise adjustment amount of the outer oblique cable by integrating the simulation calculation result, the processing error of the outer oblique cable and the processing and mounting error of the peripheral ring beam of the roof in the step S2; in the step S4, the cable length of the preliminarily adjusted outer ridge cable is accurately adjusted by integrating the processing error of the outer ridge cable and the processing and mounting error of the peripheral structure of the roof on the basis of the determined preliminary adjustment amount of the cable length of the outer ridge cable, so as to determine the accurate adjustment amount of each outer ridge cable.
9. The molding method according to claim 8, wherein: and the outer ridge cable and the outer oblique cable are provided with cable adjusting screws, the cable length in the step S4 is accurately adjusted through tensioning cable force, so that the cable length of the cable is accurately controlled, and the in-out amount of the cable adjusting screws is checked.
10. The molding method according to claim 8, wherein: the deviation between the actual value of the outer oblique cable force in the cable dome structure after stretch forming and the calculated value of the cable force in the simulation analysis structure of the step S2 is within +/-10%.
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| CN117587929A (en) * | 2024-01-17 | 2024-02-23 | 北京建工集团有限责任公司 | Center pressure ring of annular closed folded plate reticulated shell structure and construction method thereof |
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| CN117587929B (en) * | 2024-01-17 | 2024-03-22 | 北京建工集团有限责任公司 | Center pressure ring of annular closed folded plate reticulated shell structure and construction method thereof |
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