CN104234433A - Tensioning and forming method and tensioning device of spoke type annular cantilever cable support grid structure - Google Patents
Tensioning and forming method and tensioning device of spoke type annular cantilever cable support grid structure Download PDFInfo
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- CN104234433A CN104234433A CN201410417602.7A CN201410417602A CN104234433A CN 104234433 A CN104234433 A CN 104234433A CN 201410417602 A CN201410417602 A CN 201410417602A CN 104234433 A CN104234433 A CN 104234433A
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Abstract
The invention relates to a tensioning and forming method and a tensioning device of a spoke type annular cantilever cable support grid structure. The spoke type annular cantilever cable support grid structure comprises an annular main body structure, a grid structure and a cable rod structure, wherein the grid structure and the cable rod structure are connected with the upper part of the main body structure, and the cable rod structure is positioned under the grid structure and comprises an annular guy cable and a radial guy cable. The method is characterized in that after the main body structure and the grid structure are constructed and the radial guy cable and the annular guy cable are lifted and installed, the radial guy cable tensioning construction is performed, and three types of tensioning devices are designed according aiming at the radial guy cables different in sizes during the tensioning construction. The deviation between the actual value of the stress of the tensioned and formed radial guy cable and the calculation value of the stress of the radial guy cable is controlled within the range of +/-5%. The forming method has the advantages that the requirements of the spoke type annular cantilever cable support grid structure are met, the efficiency is high, the construction is simple and convenient, the operation is easy, the construction quality is guaranteed, and the method can be widely applied to the tensioning construction of the spoke type annular cantilever cable support grid structure.
Description
Technical field
The string that the present invention relates in a kind of large span spatial structure props up construction method and the tensioning equipment in Construction of Prestressed Steel Structures field, particularly stretch-draw forming.
Background technology
In recent years, along with the sustained and rapid development of China's economic civilization, large-span prestressed steel structure obtains unprecedented development, has emerged much new form of structure and moulding, has defined the multiple space structure system differed from one another.Wherein string props up structure and from it is born, just causes attracting attention of common people with the cost of the moulding of its novelty, cleverly design and economy, and engineering practice both domestic and external more shows its powerful vitality and wide application prospect.Prop up the general classification of structure according to string, more common string props up structure to be had: beam string, truss string structure, suspen-shell structure etc.
The specific constructive form that string props up structure is varied, but generally all comprises following a few partial component: stiffening member winds up, lower flexible drag-line and the vertical strut that is connected between the two.
String propped up prestressed steel structure before non-Shi Hanzhang, rigidity and supporting capacity less, distortion is comparatively large, and what have even cannot be shaped, and only could meet after Shi Hanzhang on designing the supporting capacity of structure and the requirement of distortion.String props up prestressed steel structure generally to be had following several by the structure formation method of Shi Hanzhang: 1, stretch-draw bottom drag-line method, can be subdivided into the radial drag-line of stretch-draw and stretch-draw hoop drag-line to the bottom Suo Xiyou be made up of radial drag-line and hoop drag-line; 2, jacking strut method; 3, bearing forced displacement method.In above-mentioned three kinds of methods, thus jacking strut method and more difficult even sometimes cannot the realization completely of bearing forced displacement method constructing operation adopt frequency not to be very high, compared with the method usually through stretch-draw drag-line to structure Shi Hanzhang in Practical Project.
When the bottom rope system of structure is made up of radial drag-line and hoop drag-line and radial Cable power is more or less the same, adopt the method Shi Hanzhang efficiency of stretch-draw hoop drag-line higher; But, when hoop drag-line is longer and radial Cable power difference is larger, adopt the mode of stretch-draw strop drag-line come Shi Hanzhang often stretch-draw complete after Suo Li uneven, do not reach desirable effect, the method Shi Hanzhang of the radial drag-line of stretch-draw can only be adopted to make structure formation.
And radial hoop cantilever Suo Cheng network is a kind of novel hybrid structure, bottom rope system is made up of radial drag-line and hoop drag-line.How for radial hoop cantilever Suo Cheng network, especially a class non-circular Suo Cheng single-layer reticulated structure wherein carries out high efficiency, the construction of high-quality stretch-draw forming, at present,, also there is a lot of drawback in the tension construction technology of this structure and be badly in need of solving in the construction technique that also neither one is complete, excellent.
Summary of the invention
The object of this invention is to provide a kind of radial hoop cantilever Suo Cheng network stretch-draw forming method and tensioning equipment, the technical problem realizing radial hoop cantilever Suo Cheng network stretch-draw forming how safely and efficiently be solved.
A kind of radial hoop cantilever Suo Cheng network stretch-draw forming method, described radial hoop cantilever Suo Cheng network comprises the agent structure of annular and is connected to the network on top and the cable-rod structure of agent structure, described cable-rod structure be positioned at network below, comprise hoop drag-line and radial drag-line, to construct and after radial drag-line and hoop drag-line erection & lift in agent structure and network, carry out radial cable tension construction, its construction method concrete steps are as follows:
Step one, adopt finite element analysis software, set up structural entity computation model, carry out each construction stage simulation analysis, provides structure the position shape of each construction stage and stress and determine that the rope of radial drag-line is long.
Step 2, removes lifting appliance, and the prestressed size set up in radial drag-line during the structure stretch-draw forming obtained according to Construction Simulation, the radial drag-line close to prestressing force size carries out merger, divides same group into.
Step 3, selects tensioning equipment according to often organizing prestressed size in radial drag-line, and the anchor ear in tensioning equipment is connected to the both sides of the radial drag-line adjustable side rope head of radial drag-line.
Whole 42 radial drag-lines are divided into two batches by step 4, are mutually alternately distributed between first 21 radial drag-lines and single radial drag-line of second batch 21 radial drag-lines.
Step 5, is connected in the tensioning equipment of first 21 radial drag-lines connections, first 21 radial drag-lines of preparation stretch-draw by jack.
Step 6, utilizes jack pair steel strand to carry out pretension, makes the steel strand uniform force on the radial drag-line of every root.
Step 7, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head to regulate the rope of first 21 radial drag-lines long.
Step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 10% of design load, pulls down the jack on first 21 radial drag-lines.
Step 9, is connected on second batch 21 radial drag-lines by jack, preparation stretch-draw second batch 21 radial drag-lines;
Step 10, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head to regulate the rope of second batch 21 radial drag-lines long;
Step 11, stretch-draw second batch 21 radial drag-lines, stretch-draw, to 10% of design load, pulls down the jack on second batch 21 radial drag-lines.
Step 12, repeat step 5, step 8, step 9 and step 11, first 21 radial drag-lines of stretch-draw and second batch 21 radial drag-lines are to 60% and 90% of design load successively.
Step 13, repeat step 5 and step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 100% of design load, removes the tensioning equipment on first 21 radial drag-lines.
Step 14, repeats step 9 and step 11, and stretch-draw second batch 21 radial drag-lines, to 100% of design load, remove the tensioning equipment on second batch 21 radial drag-lines.
Described finite element analysis software is ANSYS or Midas.
In step 2,42 radial drag-lines are according to prestressing force size, and the radial drag-line being altogether divided into three groups: 20 diameter 90mm is first group, and the radial drag-line of 6 diameter 100mm is second group, and the radial drag-line of 16 diameter 127mm is the 3rd group.
Time in stretching process, every grade of stretching force is converted into corresponding oil pressure gauge oil pressure value according to jack with the demarcation certificate of oil pressure gauge; Meanwhile, according to construction stage simulation analysis, calculate the elongation value of stretching of the radial drag-line every grade of every root; During stretch-draw, the pulling force being applied to radial drag-line along with jack increases steadily, adjusts the protruded length of radial drag-line adjusting screw(rod) at any time, acting in agreement of the radial drag-line adjustable side rope head of the increase of oil pressure and radial drag-line adjusting screw(rod) precession; Based on oil pressure cntrol, control to be auxiliary with the protruded length value of radial drag-line adjusting screw(rod).
In step 7, according to the initial stress of the radial drag-line determined in step one, calculate the rope of radial drag-line under unstress state in conjunction with the cable body parameter of radial drag-line and material parameter long, determine the preliminary adjustment amount that the rope of the radial drag-line of every root is long; After radial drag-line is connected with ring beam otic placode, the preliminary adjustment amount grown according to the rope of the above-mentioned radial drag-line determined is to the Suo Changjin Row sum-equal matrix of radial drag-line, in the stretching process of radial drag-line, utilize tensioning equipment to regulate the radial drag-line adjusting screw(rod) of adjustment relative to the turnover amount of radial drag-line adjustable side rope head, control the rope of radial drag-line is long.
In stretching process, tensioning equipment is utilized to carry out accurate adjustment to the rope of radial drag-line is long at any time: on the basis of the preliminary adjustment amount of the rope length of the radial drag-line determined, the mismachining tolerance of comprehensive radial drag-line and the fabrication error of agent structure and ring beam otic placode, determine the accurate adjustment amount of the radial drag-line of every root; At the Suo Changshi of the radial drag-line of accurate adjustment, utilize rule accurately to control the rope of radial drag-line is long, and the turnover amount of radial drag-line adjusting screw(rod) is checked.
Described tensioning equipment comprises the 3rd tensioning equipment that the first tensioning equipment, second tensioning equipment that connects of radial drag-line of diameter 100mm and the radial drag-line of diameter 127mm that are connected with the radial drag-line of diameter 90mm connect.
Described first tensioning equipment, comprises first heavy frame, two the first jack, two first steel strand, two the first anchor ears and two cross-arms; Two the first anchor ears are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head, and two the first anchor ears be arranged in parallel, the straight flange of homonymy passes from the two ends of same cross-arm simultaneously, are fixed respectively by a U card nut; Every root first steel strand successively through the first jack with the first heavy frame, be connected with two cross-arms respectively; Two first jack symmetry be connected to the first heavy frame two ends and and be lined with the first jack packing ring between the first heavy frame; The middle part of the first heavy frame has the through hole through radial drag-line adjusting screw(rod).
Described second tensioning equipment, comprises second heavy frame, four the second jack, four second steel strand, two the second anchor ears and four coupling sleeves; Described two the second anchor ears are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head, two the second anchor ears be arranged in parallel, the straight flange of homonymy links fishplate bar through same U, and the end of each root straight flange of the second anchor ear is all connected with a coupling sleeve by a nut of transferring; The other end of coupling sleeve is connected with second steel strand by hold-down nut, and the other end of the second steel strand is successively through the second heavy frame and the second jack; Four the second jack symmetries are connected to the two ends of the second heavy frame, all be lined with a second jack packing ring between each second jack and the second heavy frame, between two the second jack of homonymy and the second heavy frame, be jointly lined with second jack pad; The middle part of the second heavy frame has the through hole through radial drag-line adjusting screw(rod).
Described 3rd tensioning equipment, comprises the 3rd heavy frame, four the 3rd jack, five one group totally four group of the 3rd steel strand and two the 3rd anchor ears; Described second anchor ear comprises rectangular base plate and U-shaped side plate, described base plate has slotted hole, the all outside horizontal buckling in both ends of described side plate has a side limb, side limb has the perforation through steel strand, two the second anchor ears be arranged in parallel, its U-shaped side plate anchor ear is in the outside of radial drag-line adjustable side rope head; 3rd steel strand are successively through the second anchor ear, the 3rd heavy frame and the 3rd jack; Four the 3rd jack symmetries are connected to the two ends of the 3rd heavy frame, all be lined with a 3rd jack packing ring between each 3rd jack and the 3rd heavy frame, between two the 3rd jack of homonymy and the 3rd heavy frame, be jointly lined with the 3rd jack pad; The middle part of the 3rd heavy frame has the through hole through radial drag-line adjusting screw(rod).
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention is directed to this new-type radial hoop cantilever Suo Cheng network and propose a kind of stretch-draw construction method, because construction will guarantee installation accuracy, therefore need in whole work progress, consider stayed structure in installation process and installation time to its Suo Changjin Row sum-equal matrix, need the final stress, the situation such as fabrication error and mismachining tolerance that consider drag-line during adjustment, the construction method that now traditional string props up structure can not meet the forming requirements of radial hoop cantilever Suo Cheng network of the present invention.
In practical operation, if simultaneous tension 42 radial cables, but this will require to drop into a large amount of tensioning equipments, and equipment purchasing expense is a no small spending; And if reduce drop into number of devices, Multi-stage prestress, can increase again the duration of engineering, and labour cost etc. also will increase.For this situation, the present invention adopts the construction technology of grading tension in batches, design machined 42 cover tensioning equipments, be connected in place with 42 radial drag-lines before stretch-draw, but be used alternatingly between two batches of radial drag-lines by jack, the jacking equipment dropped into so just decreases half, amounts to 20, use 100 tons of jack, 12,60 tons of jack, 32,150 tons of jack; Meanwhile, like this when Multi-stage prestress, only need between two batches of drag-lines, switch jack just passable, need not switch frock again, the weight of jack is much smaller compared with the weight of integral tension device, saves time and manpower, has saved cost.
In the present invention, according to the initial stress of the radial drag-line of the number of determination, calculate the rope of radial drag-line under unstress state in conjunction with the cable body parameter of radial drag-line and material parameter long, determine the preliminary adjustment amount that the rope of radial drag-line is long, after radial drag-line is connected with ring beam otic placode, the preliminary adjustment amount grown according to the rope of the radial drag-line determined is to the Suo Changjin Row sum-equal matrix of radial drag-line, tensioning equipment is utilized to be on the basis of the long preliminary adjustment amount of the rope of the radial drag-line determined to the long accurate adjustment that carries out of the rope of radial drag-line, the mismachining tolerance of comprehensive radial drag-line and the fabrication error of agent structure and otic placode, thus the accurate adjustment amount determining the radial drag-line of every root, the termination of radial drag-line is provided with radial drag-line adjusting screw(rod), in the installation process of radial drag-line, the tensioning equipment of hood type is utilized to be controlled the rope of radial drag-line is long by the turnover amount of the radial drag-line adjusting screw(rod) of adjustment, at the Suo Changshi of the radial drag-line of accurate adjustment, utilize rule accurately to control the rope of radial drag-line is long, and check by the turnover amount of drag-line adjusting screw(rod), in stretch-draw forming process, to the Suo Li of steel cable, the vertical displacement of structure and the stress of steel work are monitored, can be real-time the state of solution structure in stretching process, accurately can control the forming effect of Suo Li in stretch-draw forming backstay and structure, reach designing requirement, ensure that construction quality, the actual value of stress of the radial drag-line in the radial hoop cantilever Suo Cheng network after employing the method stretch-draw forming and the calculated value Deviation Control of the stress of radial drag-line are within ± 5%, its manufacturing process can meet the requirement of described radial hoop cantilever Suo Cheng network, and efficiency is high, easy construction easily operates, ensure that construction quality simultaneously.
The present invention can be widely used in radial hoop cantilever Suo Cheng network stretching construction.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is the structural representation of radial hoop cantilever Suo Cheng network of the present invention.
Fig. 2 is the structural representation of cable-rod structure of the present invention.
Fig. 3 is the numbering specification schematic diagram of cable-rod structure of the present invention.
Fig. 4 is the partial structurtes schematic diagram of radial hoop cantilever Suo Cheng network of the present invention.
Fig. 5 is the docking structure schematic diagram of hoop drag-line of the present invention.
Fig. 6 is the structural representation of hoop drag-line cord clip of the present invention.
Fig. 7 is the structural representation of radial drag-line cord clip of the present invention.
Fig. 8 is the syndeton schematic front view of radial drag-line adjustable side rope head of the present invention and radial drag-line adjusting screw(rod).
Fig. 9 is the syndeton schematic side view of radial drag-line adjustable side rope head of the present invention and radial drag-line adjusting screw(rod).
Figure 10 is the structural representation of the first tensioning equipment of the present invention.
Figure 11 is the structural representation of the first heavy frame of the first tensioning equipment of the present invention.
Figure 12 is the structural representation of the U card nut of the first tensioning equipment of the present invention.
Figure 13 is the structural representation of the second tensioning equipment of the present invention.
Figure 14 is the structural representation of the second heavy frame of the second tensioning equipment of the present invention.
Figure 15 is the second anchor ear of the second tensioning equipment of the present invention and the syndeton schematic diagram of the second steel strand.
Figure 16 is the structural representation of the second jack packing ring of the second tensioning equipment of the present invention.
Figure 17 is the structural representation of the second jack pad of the second tensioning equipment of the present invention.
Figure 18 is the structural representation that the U of the second tensioning equipment of the present invention links fishplate bar.
Figure 19 is the structural representation of the 3rd tensioning equipment of the present invention.
Figure 20 is the structural representation of the 3rd heavy frame of the 3rd tensioning equipment of the present invention.
Figure 21 is the structural representation of the 3rd anchor ear of the 3rd tensioning equipment of the present invention.
Figure 22 is the structure schematic front view of the 3rd jack packing ring of the 3rd tensioning equipment of the present invention.
Figure 23 is the structural representation of the 3rd jack pad of the 3rd tensioning equipment of the present invention.
Figure 24 is the emulation stretching force numbering schematic diagram of radial drag-line of the present invention.
Reference numeral: 1-network, 2-cable-rod structure, the radial drag-line of 2.1-, the radial drag-line cord clip of 2.2-, 2.3-radial drag-line cord clip support bar, 2.4-radial drag-line adjustable side rope head, the radial drag-line adjusting screw(rod) of 2.5-, 2.6-hoop drag-line, 2.7-hoop drag-line cord clip, 2.8-hoop drag-line cord clip support bar, 2.9-hoop drag-line cord clip hound, 2.10-hoop Cable head, 3-agent structure, 3.1-ring beam, 3.2-ring beam otic placode, 4-first tensioning equipment, 4.1-first heavy frame, 4.2-first steel strand, 4.3-first anchor ear, 4.4-cross-arm, 4.5-first jack, 4.6-first jack packing ring, 4.7-U card nut
5-second tensioning equipment, 5.1-second heavy frame, 5.2-second steel strand, 5.3-second anchor ear, 5.4-coupling sleeve, 5.5-second jack, 5.6-second jack packing ring, 5.7-switching nut, 5.8-hold-down nut, 5.9-second jack pad, 5.10-U link fishplate bar, 6-the 3rd tensioning equipment, 6.1-the 3rd heavy frame, 6.2-the 3rd steel strand, 6.3-the 3rd anchor ear, 6.4-the 3rd jack, 6.5-the 3rd jack packing ring, 6.6-the 3rd jack pad.
Detailed description of the invention
Shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, described radial hoop cantilever Suo Cheng network comprises the agent structure 3 of annular and is connected to the network 1 on top and the cable-rod structure 2 of agent structure 3, described cable-rod structure 2 be positioned at network 1 below, comprise hoop drag-line 2.6 and radial drag-line 2.1, the present invention to have constructed and after radial drag-line and hoop drag-line erection & lift in agent structure 3 and network 1, the stretching construction operation of carrying out, construction sequence is as follows in earlier stage for it:
Step one, shown in Figure 1, carry out the construction of agent structure 3, the ring beam 3.1 on the top of described agent structure 3, described ring beam 3.1 is connected with ring beam otic placode 3.2.
Step 2, sets up the support jig of ring beam 3.1 on the top of agent structure 3, install network 1;
Step 3, shown in Fig. 2, Fig. 6, hoop drag-line 2.6 is laid on the ground in the middle of agent structure 3, is alignd by the gauge point of many hoop ropes, install corresponding hoop drag-line cord clip 2.6; And around hoop drag-line 2.6 the radial drag-line 2.1 of connection, the radial drag-line 2.1 of described hoist cable is uniformly distributed around hoop drag-line 2.6 in radiation, described hoop drag-line 2.6 is connected with radial drag-line 2.1 pin joint by hoop drag-line cord clip 2.7, and radial drag-line 2.1 connects corresponding radial drag-line cord clip 2.2.
Step 4, sets up the support jig of ring beam 3.1 on the top of agent structure 3, and total is divided into four regions and constructs respectively.
Step 5, whole 42 radial drag-lines are divided into two batches, mutually be alternately distributed between first 21 radial drag-lines and single radial drag-line of second batch 21 radial drag-lines, shown in Figure 3, namely odd number is one group, even number is one group, and often organizes 21 radial drag-lines and all distribute symmetrically and evenly around hoop drag-line 2.6;
Step 6, first for the region of 1/4th, network 1 is installed, utilize lifting appliance to promote first 21 radial drag-lines and second batch 21 radial drag-lines successively, hoop drag-line 2.5 corresponding in this region and radial drag-line 2.1 are promoted to the below of network 1 by lifting appliance.
Step 7, shown in Fig. 4, Fig. 7, Fig. 8, Fig. 9, radial drag-line 2.1 and hoop drag-line 2.6 in place after, by radial drag-line adjustable side rope head 2.4, radial drag-line 2.1 is connected with ring beam otic placode 3.2, and remove lifting appliance, between radial drag-line and network 1, connect radial drag-line cord clip support bar 2.3, between hoop drag-line 2.6 and network 1, connecting ring is to drag-line cord clip support bar 2.8 and hoop drag-line cord clip hound 2.9; Described hoop drag-line 2.6 is connected with hoop drag-line cord clip support bar 2.8 pin joint by hoop drag-line cord clip 2.7, be connected and fixed with hoop drag-line cord clip hound 2.9, here, hoop drag-line cord clip 2.7 arranges three pairs of otic placodes, hit exactly a pair, each a pair of both sides, be connected with the hoop drag-line cord clip hound 2.9 on both sides with hoop drag-line cord clip support bar 2.8 respectively, just a pair otic placode of center is connected with hoop drag-line cord clip support bar 2.8 before lifting, after installation to be hoisted, a pair otic placode of both sides is connected with corresponding hound respectively; Described radial drag-line 2.1 is connected with radial drag-line cord clip support bar 2.3 pin joint by radial drag-line cord clip 2.2, in order to ensure the quality of cord clip, must carry out antirust treatment to cord clip.
Step 8, the sequence of construction of step 6, step 7, completes the construction in remaining 3/4ths regions successively.
Step 9, shown in Figure 5, docked by hoop Cable head 2.10 between hoop drag-line 2.6.
Radial hoop cantilever Suo Cheng network stretch-draw forming method of the present invention, to have constructed and after radial drag-line and hoop drag-line erection & lift in aforementioned body structure 3 and network 1, the radial cable tension construction carried out, according to the loading characteristic of this structure, the pluses and minuses of analysis, the prestressed method of more various applying steel cables and feasibility, determine that its construction method concrete steps are as follows in the mode of the radial drag-line of stretch-draw to set up prestressing force:
Step one, adopt finite element analysis software, such as ANSYSY or Midas, set up structural entity computation model, set up the overall structure computation model of radial hoop cantilever Suo Cheng network, control as principle with structure position shape, the initial stress of each lower floor drag-line is also finally determined in adjustment repeatedly, and according to this initial stress, carry out the simulation analysis of each construction stage, provide radial hoop cantilever Suo Cheng network the position shape of each construction stage and stress and determine that the rope of steel cable is long.
Stretching process simulative calculation of construction content comprises following several aspect, structure vertical displacement and moulding bed support force after steel structure assembling completes; Structure vertical displacement after first 21 radial drag-line grading tensions complete, steel work stress, Suo Li, Suo Yingli and moulding bed support force; Structure vertical displacement after the radial drag-line grading tension of second batch 21 completes, steel work stress, Suo Li, Suo Yingli and moulding bed support force.
Be: after 1, Steel Structure Installation completes that network Cantilever Beams maximum downward displacement is-75mm, and steel work maximum tension stress is 110N/mm according to the simulation result that foregoing draws
2, maximum crushing stress is-83N/mm
2, moulding bed maximum support power is 406kN.
2, after first order stretch-draw completes, network Cantilever Beams maximum downward displacement is-70mm, and steel work maximum tension stress is 84N/mm
2, maximum crushing stress is-107N/mm
2, the most hawser power of hoop drag-line is 2199kN, and most hawser stress is 42N/mm
2, the most hawser power of radial drag-line is 531kN, and most hawser stress is 56N/mm
2, moulding bed maximum support power is 416kN;
3, after second level stretch-draw completes, network Cantilever Beams is maximum is 43mm to top offset, and steel work maximum stress is 113N/mm
2, maximum crushing stress is-96N/mm
2, the most hawser power of hoop drag-line is 10050kN, and most hawser stress is 193N/mm
2, the most hawser power of radial drag-line is 2420kN, and most hawser stress is 256N/mm
2, moulding bed maximum support power is 88kN.
4, after third level stretch-draw completes, network Cantilever Beams is maximum is 247mm to top offset, and steel work maximum stress is 134N/mm
2, maximum crushing stress is-112N/mm
2, the most hawser power of hoop drag-line is 12647kN, and most hawser stress is 242N/mm
2, the most hawser power of radial drag-line is 3027kN, and most hawser stress is 322N/mm
2, steel work departs from moulding bed;
5, after fourth stage stretch-draw completes, network Cantilever Beams is maximum is 297mm to top offset, and steel work maximum stress is 140N/mm
2, maximum crushing stress is-125N/mm
2, the most hawser power of hoop drag-line is 13417kN, and most hawser stress is 257N/mm
2, the most hawser power of radial drag-line is 3205kN, and most hawser stress is 342N/mm
2;
For the uniqueness of this form of structure, have employed method of just taking and the method for tearing open respectively to adopt and carried out analytical calculation to prestress application process: just the method for taking is exactly the order according to project site operation process, progressively structure is put up by zero like the form played with building blocks; Tear method open and just to take method just contrary, structure progressively splits by the opposite sequence according to work progress from the one-tenth form that structure construction completes.
Adopt the construction technology of Multi-stage prestress, out-of-balance force in drag-line can increase, likely can there is the phenomenon of slippage in cord clip in stretching process, for the feasibility of the resistant slide performance and integral tension in batches of verifying cord clip, except having carried out Construction simulation, also carry out the slip resistance experiment comprising radial drag-line, hoop drag-line and cord clip, draw the anti-slip coefficient
of the resistant slide power of cord clip and the rubbing surface between cable body and node.the feasibility of the resistant slide performance of result verification cord clip and in batches integral tension.
Step 2, lifting appliance is removed, the prestressed size set up in radial drag-line during the structure stretch-draw forming obtained according to Construction Simulation, the radial drag-line 2.1 close to prestressing force size carries out merger, divides same group: 42 radial drag-lines into according to prestressing force size, the radial drag-line being altogether divided into three groups: 20 diameter 90mm is first group, the radial drag-line of 6 diameter 100mm is second group, and the radial drag-line of 16 diameter 127mm is the 3rd group.
Step 3, the tensioning equipment of its bearing capacity and rigidity requirement is met according to often organizing prestressed size selection in radial drag-line, described tensioning equipment is hood type, hood type tensioning equipment mainly comprises heavy frame, anchor ear, steel strand and jack, described jack is symmetry through the two ends of heavy frame, steel strand are connected with anchor ear with heavy frame through jack successively, radial drag-line adjusting screw(rod) 2.5 is connected with between described anchor ear and heavy frame, described radial drag-line adjusting screw(rod) 2.5 is connected with radial drag-line adjustable side rope head 2.4, anchor ear in tensioning equipment is connected to the both sides of radial drag-line adjustable side rope head 2.4: described anchor ear embraces in the bi-lug plate of radial drag-line adjustable side rope head 2.4, described anchor ear, bi-lug plate and the ring beam otic placode three of radial drag-line adjustable side rope head 2.4 pass through pinned connection.
Step 4, shown in Figure 3, whole 42 radial drag-lines are divided into two batches according to the mark of odd and even number, often organize 21 radial cables, mutually be alternately distributed between first 21 radial drag-lines and single radial drag-line of second batch 21 radial drag-lines, for the input amount controlling the equipment such as jack of increasing work efficiency simultaneously, determine that the radial drag-line of every root configures a set of tensioning equipment, amount to 42 covers, but jack wherein will be used alternatingly between first 21 radial drag-lines and second batch 21 radial drag-lines, like this, the input amount of jack can be made to reduce half, reduce cost.
Step 5, the size of stretching force during diameter and stretch-draw according to radial drag-line, select the specification and the quantity that meet the jack of stretching force requirement, such as select employing two or four jack simultaneous tensions in parallel respectively, the jack chosen is connected in the tensioning equipment of first 21 radial drag-lines connections, first 21 radial drag-lines of preparation stretch-draw;
Step 6, utilize jack pair steel strand to carry out pretension, make the steel strand uniform force on the radial drag-line of every root, the steel strand number ratio on the radial drag-line of especially diameter 127mm is more, steel strand length must be adjusted consistent, avoid jack eccentric when stretch-draw.
Step 7, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head 2.4 to regulate the rope of first 21 radial drag-lines long;
Step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 10% of design load, pulls down the jack on first 21 radial drag-lines;
Step 9, is connected on second batch 21 radial drag-lines by jack, preparation stretch-draw second batch 21 radial drag-lines;
Step 10, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head 2.4 to regulate the rope of second batch 21 radial drag-lines long;
Step 11, first 21 radial drag-lines of stretch-draw, stretch-draw, to 10% of design load, pulls down the jack on first 21 radial drag-lines;
Step 12, repeat step 5, step 8, step 9 and step 11, first 21 radial drag-lines of stretch-draw and second batch 21 radial drag-lines are to 60% and 90% of design load successively;
Step 13, repeat step 5 and step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 100% of design load, removes the tensioning equipment on first 21 radial drag-lines;
Step 14, repeats step 9 and step 11, and stretch-draw second batch 21 radial drag-lines, to 100% of design load, remove the tensioning equipment on second batch 21 radial drag-lines.
It is main that stretching process Controlling principle: Suo Li controls, and it is auxiliary that vertical deformation controls, and in conjunction with the numbering see the radial drag-line in Figure 24, radial drag-line often walks stretch-draw force value and sees table:
By the method for stretch-draw radial drag-line, radial hoop cantilever Suo Cheng network is shaped, stretching process is divided into level Four to complete, if step 8 is to step 14, be respectively 10%, 60%, 90% and 100%, Integral synchronous or in batches synchronous stretching mode complete, after wherein the radial drag-line second level stretch-draw of second batch 21 completes, the weld seam of steel structure support moulding bed and network should be cut, to ensure that network can free arch camber, time in stretching process, every grade of stretching force is converted into corresponding oil pressure gauge oil pressure value according to jack with the demarcation certificate of oil pressure gauge, meanwhile, according to construction stage simulation analysis, calculate the elongation value of stretching of the radial drag-line every grade of every root, during stretch-draw, the pulling force being applied to radial drag-line along with jack increases steadily, adjusts the protruded length of radial drag-line adjusting screw(rod) 2.5 at any time, acting in agreement of the increase of oil pressure and radial drag-line adjusting screw(rod) 2.5 precession radial drag-line adjustable side rope head 2.4, based on oil pressure cntrol, control to be auxiliary with the protruded length value of radial drag-line adjusting screw(rod) 2.5.
In step 7, according to the initial stress of the radial drag-line determined in step one, calculate the rope of radial drag-line under unstress state in conjunction with the cable body parameter of radial drag-line and material parameter long, determine the preliminary adjustment amount that the rope of the radial drag-line of every root is long; After radial drag-line is connected with ring beam otic placode, the preliminary adjustment amount grown according to the rope of the above-mentioned radial drag-line determined is to the Suo Changjin Row sum-equal matrix of radial drag-line, in the stretching process of radial drag-line, utilize tensioning equipment to regulate the radial drag-line adjusting screw(rod) of adjustment relative to the turnover amount of radial drag-line adjustable side rope head, control the rope of radial drag-line is long.
In stretching process, tensioning equipment is utilized to carry out accurate adjustment to the rope of radial drag-line is long at any time: on the basis of the preliminary adjustment amount of the rope length of the radial drag-line determined, the mismachining tolerance of comprehensive radial drag-line and the fabrication error of agent structure and ring beam otic placode, determine the accurate adjustment amount of the radial drag-line of every root; At the Suo Changshi of the radial drag-line of accurate adjustment, utilize rule accurately to control the rope of radial drag-line is long, and the turnover amount of radial drag-line adjusting screw(rod) is checked, after stretch-draw completes, the high-strength bolt of all components is tightened again.
In stretch-draw forming process, to the Suo Li of steel cable, the vertical displacement of structure and the stress of steel work are monitored, can be real-time the state of solution structure in stretching process, accurately can control the forming effect of Suo Li in stretch-draw forming backstay and structure, reach designing requirement, ensure that construction quality: to the Suo Li of drag-line in prestress application process, the vertical displacement of structure and the stress of steel work are all monitored, wherein the monitoring point of Suo Li is the Suo Li of 42 radial cables, cable force monitoring is monitored by oil pressure gauge reading in stretching process and EM cable-tension tester, the vertical displacement measuring point of structure selects the beam-ends and the span centre position that connect the radial girders of radial drag-line in 20 Pin networks, and have 40 monitoring points, reflecting piece is all posted in position, monitoring point, is monitored by total powerstation, steel work stress monitoring point is distributed in ring beam and radial girders, and totally 24 monitoring points, are monitored by vibratory strain ga(u)ge.
Adopt the calculated value deviation of the stress of radial drag-line in the actual value of the stress of the radial drag-line in the radial hoop cantilever Suo Cheng network after this construction method stretch-draw forming and step one within ± 5%.
The radial drag-line of 20 diameter 90mm is first group, select the first tensioning equipment 4, shown in figure Fig. 8, Fig. 9, Figure 10, Figure 11 and Figure 12, comprise first heavy frame 4.1, two the first jack 4.5, two first steel strand, 4.2, two the first anchor ears 4.3 and two cross-arms 4.4; Two the first anchor ears 4.3 are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head 2.4, and two the first anchor ears 4.3 be arranged in parallel, the straight flange of homonymy passes from the two ends of same cross-arm 4.4 simultaneously, are fixed respectively by a U card nut 4.7; Every root first steel strand 4.2 successively through the first jack 4.5 with the first heavy frame 4.1, be connected with two cross-arms 4.4 respectively; Two the first jack 4.5 symmetries be connected to the first heavy frame 4.1 two ends and and be lined with the first jack packing ring 4.6 between the first heavy frame 4.1; The middle part of the first heavy frame 4.1 has the through hole through radial drag-line adjusting screw(rod) 2.5; The maximum stretching force of the radial drag-line of diameter 90mm is 1500kN, configures the jack of two tonnages 100 tons, and adopt the steel strand of 2 28.6 millimeters, the maximum pull that every root is born is 750kN, meets load bearing requirements.
The radial drag-line of 6 diameter 100mm is second group, select the second tensioning equipment 5, shown in figure Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17, comprise second heavy frame 5.1, four the second jack 5.5, four second steel strand, 5.2, two the second anchor ears 5.3 and four coupling sleeves 5.4; Described two the second anchor ears 4.3 are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head 2.4, two the second anchor ears 4.3 be arranged in parallel, the straight flange of homonymy links fishplate bar 5.10 through same U, and the end of each root straight flange of the second anchor ear 4.3 is all connected with a coupling sleeve 5.4 by a switching nut 5.7; The other end of coupling sleeve 5.4 is connected with second steel strand 5.2 by hold-down nut 5.8, and the other end of the second steel strand 5.2 is successively through the second heavy frame 5.1 and the second jack 5.5; Four the second jack 5.5 symmetries are connected to the two ends of the second heavy frame 5.1, all be lined with a second jack packing ring 5.6 between each second jack 5.5 and the second heavy frame 5.1, between two the second jack 5.5 of homonymy and the second heavy frame 5.1, be jointly lined with second jack pad 5.9; The middle part of the second heavy frame 5.1 has the through hole through radial drag-line adjusting screw(rod) 2.5; The maximum stretching force of the radial drag-line of diameter 100mm is 2000kN, configures the jack of four tonnages 60 tons, and adopt 4 22 millimeters of steel strand, the maximum pull that every root is born is 500kN, meets load bearing requirements.
The radial drag-line of 16 diameter 127mm is the 3rd group, select the 3rd tensioning equipment 6, shown in figure Figure 19, Figure 20, Figure 21, Figure 22 and Figure 23, comprise 6.4, five one group, the 3rd heavy frame 6.1, four the 3rd jack totally four group of the 3rd steel strand 5.2 and two the 3rd anchor ears 6.3; Described second anchor ear 6.3 comprises rectangular base plate and U-shaped side plate, and described base plate has slotted hole, and all outside horizontal buckling in both ends of described side plate has a side limb, side limb has the perforation through steel strand; Two the second anchor ears 4.3 be arranged in parallel, its U-shaped side plate anchor ear is in the outside of radial drag-line adjustable side rope head 2.4; 3rd steel strand 6.2 are successively through the second anchor ear 4.3, the 3rd heavy frame 6.1 and the 3rd jack 6.4; Four the 3rd jack 6.4 symmetries are connected to the two ends of the 3rd heavy frame 6.1, all be lined with a 3rd jack packing ring 6.5 between each 3rd jack 6.4 and the 3rd heavy frame 6.1, between two the 3rd jack 6.4 of homonymy and the 3rd heavy frame 6.1, be jointly lined with the 3rd jack pad 6.6; The middle part of the 3rd heavy frame 6.1 has the through hole through radial drag-line adjusting screw(rod) 2.5; The maximum stretching force of the radial drag-line of diameter 127mm is 3200kN, and configure the jack of four tonnages 150 tons, 5 15.2 steel strand joined by every platform jack, and amount to 20, the maximum pull that every root steel strand are born is 160kN, meets load bearing requirements.
Claims (10)
1. a radial hoop cantilever Suo Cheng network stretch-draw forming method, it is characterized in that, described radial hoop cantilever Suo Cheng network comprises the agent structure (3) of annular and is connected to the network (1) on top and the cable-rod structure (2) of agent structure (3), described cable-rod structure (2) be positioned at network (1) below, comprise hoop drag-line (2.6) and radial drag-line (2.1), to construct and after radial drag-line and hoop drag-line erection & lift in agent structure (3) and network (1), carry out radial cable tension construction, its construction method concrete steps are as follows:
Step one, adopt finite element analysis software, set up structural entity computation model, carry out each construction stage simulation analysis, provides structure the position shape of each construction stage and stress and determine that the rope of radial drag-line is long;
Step 2, removes lifting appliance, the prestressed size set up in radial drag-line during the structure stretch-draw forming obtained according to Construction Simulation, and the radial drag-line (2.1) close to prestressing force size carries out merger, divides same group into;
Step 3, selects tensioning equipment according to often organizing prestressed size in radial drag-line, and the anchor ear in tensioning equipment is connected to the both sides of radial drag-line adjustable side rope head (2.4) of radial drag-line;
Whole 42 radial drag-lines are divided into two batches by step 4, are mutually alternately distributed between first 21 radial drag-lines and single radial drag-line of second batch 21 radial drag-lines;
Step 5, is connected in the tensioning equipment of first 21 radial drag-lines connections, first 21 radial drag-lines of preparation stretch-draw by jack;
Step 6, utilizes jack pair steel strand to carry out pretension, makes the steel strand uniform force on the radial drag-line of every root;
Step 7, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head (2.4) to regulate the rope of first 21 radial drag-lines long;
Step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 10% of design load, pulls down the jack on first 21 radial drag-lines;
Step 9, is connected on second batch 21 radial drag-lines by jack, preparation stretch-draw second batch 21 radial drag-lines;
Step 10, utilizes the radial drag-line adjusting screw(rod) be connected with radial drag-line adjustable side rope head (2.4) to regulate the rope of second batch 21 radial drag-lines long;
Step 11, stretch-draw second batch 21 radial drag-lines, stretch-draw, to 10% of design load, pulls down the jack on second batch 21 radial drag-lines;
Step 12, repeat step 5, step 8, step 9 and step 11, first 21 radial drag-lines of stretch-draw and second batch 21 radial drag-lines are to 60% and 90% of design load successively;
Step 13, repeat step 5 and step 8, first 21 radial drag-lines of stretch-draw, stretch-draw, to 100% of design load, removes the tensioning equipment on first 21 radial drag-lines;
Step 14, repeats step 9 and step 11, and stretch-draw second batch 21 radial drag-lines, to 100% of design load, remove the tensioning equipment on second batch 21 radial drag-lines.
2. radial hoop cantilever Suo Cheng network stretch-draw forming method according to claim 1, is characterized in that: described finite element analysis software is ANSYS or Midas.
3. radial hoop cantilever Suo Cheng network stretch-draw forming method according to claim 1, it is characterized in that: in step 2,42 radial drag-lines are according to prestressing force size, the radial drag-line being altogether divided into three groups: 20 diameter 90mm is first group, the radial drag-line of 6 diameter 100mm is second group, and the radial drag-line of 16 diameter 127mm is the 3rd group.
4. radial hoop cantilever Suo Cheng network stretch-draw forming method according to claim 1, is characterized in that: time in stretching process, every grade of stretching force is converted into corresponding oil pressure gauge oil pressure value according to jack with the demarcation certificate of oil pressure gauge; Meanwhile, according to construction stage simulation analysis, calculate the elongation value of stretching of the radial drag-line every grade of every root; During stretch-draw, the pulling force being applied to radial drag-line along with jack increases steadily, adjust the protruded length of radial drag-line adjusting screw(rod) (2.5) at any time, acting in agreement of the increase of oil pressure and radial drag-line adjusting screw(rod) (2.5) precession radial drag-line adjustable side rope head (2.4); Based on oil pressure cntrol, control to be auxiliary with the protruded length value of radial drag-line adjusting screw(rod) (2.5).
5. radial hoop cantilever Suo Cheng network stretch-draw forming method according to claim 1, it is characterized in that: in step 7, according to the initial stress of the radial drag-line determined in step one, calculate the rope of radial drag-line under unstress state in conjunction with the cable body parameter of radial drag-line and material parameter long, determine the preliminary adjustment amount that the rope of the radial drag-line of every root is long; After radial drag-line is connected with ring beam otic placode, the preliminary adjustment amount grown according to the rope of the above-mentioned radial drag-line determined is to the Suo Changjin Row sum-equal matrix of radial drag-line, in the stretching process of radial drag-line, utilize tensioning equipment to regulate the radial drag-line adjusting screw(rod) of adjustment relative to the turnover amount of radial drag-line adjustable side rope head, control the rope of radial drag-line is long.
6. radial hoop cantilever Suo Cheng network stretch-draw forming method according to claim 5, it is characterized in that: in stretching process, tensioning equipment is utilized to carry out accurate adjustment to the rope of radial drag-line is long at any time: on the basis of the preliminary adjustment amount of the rope length of the radial drag-line determined, the mismachining tolerance of comprehensive radial drag-line and the fabrication error of agent structure and ring beam otic placode, determine the accurate adjustment amount of the radial drag-line of every root; At the Suo Changshi of the radial drag-line of accurate adjustment, utilize rule accurately to control the rope of radial drag-line is long, and the turnover amount of radial drag-line adjusting screw(rod) is checked.
7. be applied in the tensioning equipment in radial hoop cantilever Suo Cheng network stretch-draw forming method as claimed in claim 1, it is characterized in that: described tensioning equipment comprises the 3rd tensioning equipment (6) that the first tensioning equipment (4), second tensioning equipment (5) that connects of radial drag-line of diameter 100mm and the radial drag-line of diameter 127mm that are connected with the radial drag-line of diameter 90mm connect.
8. tensioning equipment according to claim 7, it is characterized in that: described first tensioning equipment (4), comprise first heavy frame (4.1), two the first jack (4.5), two first steel strand (4.2), two the first anchor ears (4.3) and two cross-arms (4.4); Two the first anchor ears (4.3) are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head (2.4), two the first anchor ears (4.3) be arranged in parallel, the straight flange of homonymy passes from the two ends of same cross-arm (4.4) simultaneously, are fixed respectively by a U card nut (4.7); Every root first steel strand (4.2) successively through the first jack (4.5) with the first heavy frame (4.1), be connected with two cross-arms (4.4) respectively; Two the first jack (4.5) symmetries be connected to the first heavy frame (4.1) two ends and and be lined with the first jack packing ring (4.6) between the first heavy frame (4.1); The middle part of the first heavy frame (4.1) has the through hole through radial drag-line adjusting screw(rod) (2.5).
9. tensioning equipment according to claim 7, it is characterized in that: described second tensioning equipment (5), comprise second heavy frame (5.1), four the second jack (5.5), four second steel strand (5.2), two the second anchor ears (5.3) and four coupling sleeves (5.4); Described two the second anchor ears (5.3) are U-shaped, anchor ear in the outside of radial drag-line adjustable side rope head (2.4), two the second anchor ears (5.3) be arranged in parallel, the straight flange of homonymy links fishplate bar (5.10) through same U, and the end of each root straight flange of the second anchor ear (4.3) is all connected with a coupling sleeve (5.4) by a nut (5.7) of transferring; The other end of coupling sleeve (5.4) is connected with second steel strand (5.2) by hold-down nut (5.8), and the other end of the second steel strand (5.2) is successively through the second heavy frame (5.1) and the second jack (5.5); Four the second jack (5.5) symmetries are connected to the two ends of the second heavy frame (5.1), all be lined with a second jack packing ring (5.6) between each second jack (5.5) and the second heavy frame (5.1), between two the second jack (5.5) of homonymy and the second heavy frame (5.1), be jointly lined with second jack pad (5.9); The middle part of the second heavy frame (5.1) has the through hole through radial drag-line adjusting screw(rod) (2.5).
10. tensioning equipment according to claim 7, it is characterized in that: described 3rd tensioning equipment (6), comprise the 3rd heavy frame (6.1), four the 3rd jack (6.4), five one group totally four group of the 3rd steel strand (6.2) and two the 3rd anchor ears (6.3); Described second anchor ear (6.3) comprises rectangular base plate and U-shaped side plate, described base plate has slotted hole, the all outside horizontal buckling in both ends of described side plate has a side limb, side limb has the perforation through steel strand, two the 3rd anchor ears (6.3) be arranged in parallel, its U-shaped side plate anchor ear is in the outside of radial drag-line adjustable side rope head (2.4); 3rd steel strand (6.2) are successively through the 3rd anchor ear (6.3), the 3rd heavy frame (6.1) and the 3rd jack (6.4); Four the 3rd jack (6.4) symmetries are connected to the two ends of the 3rd heavy frame (6.1), all be lined with a 3rd jack packing ring (6.5) between each 3rd jack (6.4) and the 3rd heavy frame (6.1), between two the 3rd jack (6.4) of homonymy and the 3rd heavy frame (6.1), be jointly lined with the 3rd jack pad (6.6); The middle part of the 3rd heavy frame (6.1) has the through hole through radial drag-line adjusting screw(rod) (2.5).
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