CN115199054A - Construction process of ultra-large span truss guy cable with string arch - Google Patents
Construction process of ultra-large span truss guy cable with string arch Download PDFInfo
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- CN115199054A CN115199054A CN202211019659.2A CN202211019659A CN115199054A CN 115199054 A CN115199054 A CN 115199054A CN 202211019659 A CN202211019659 A CN 202211019659A CN 115199054 A CN115199054 A CN 115199054A
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000010276 construction Methods 0.000 title claims abstract description 54
- 230000008569 process Effects 0.000 title claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 238000009434 installation Methods 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 11
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- 238000004364 calculation method Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
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- 239000003245 coal Substances 0.000 description 9
- 239000000725 suspension Substances 0.000 description 7
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- 238000011065 in-situ storage Methods 0.000 description 2
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- 238000009435 building construction Methods 0.000 description 1
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- 238000004939 coking Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E04G21/121—Construction of stressing jacks
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Abstract
The invention discloses a construction process of a guy cable of an ultra-large span truss string arch truss, which comprises the following steps: s1: installing and fixing a hanging rope slideway; s2: selecting a type of traction equipment; s3: the crane is matched with a rope to spread and hang the rope; s4: the guy cable head pin shaft is fixedly arranged; s5: dismantling the hanging rope slideway; s6: installing a cable clamp of a inhaul cable; s7: and tensioning the stay cable. The invention has the advantages that: (1) according to the method, finite element calculation software is adopted to carry out detailed simulation analysis on the stay cable construction process, so that the verticality of the stay rod and the structure of the stay cable after construction are ensured to reach a design state; (2) according to the invention, through simulation analysis, the construction process is simplified, the actual tension value of each cable is given in one step, the tension adjusting times of the cable are reduced, and the structure stress is more accurate; (3) the invention adopts the steel strand as the auxiliary hanging cable installation slideway, is not limited by a construction site and the lower environment, does not need the cooperation of a crane in the whole process, and has wide application range.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction process of a guy cable of an ultra-large span truss string arch truss.
Background
With the increasing severity of atmospheric pollution and haze, dust can be generated in open-air coal yards of enterprises such as thermal power plants, ports and docks, coal mines, metallurgy and coking in the process of operation and storage yards in windy weather, which not only causes a great deal of material loss, but also pollutes the surrounding environment. At present, a totally-enclosed measure is implemented on a coal yard, so that a large-span structure of a closed modification project of the coal yard is required to be applied, and the truss-string arch truss is used as a novel steel structure form, has light dead weight and large span, and is well applied to the closed modification of the coal yard.
At present, the prestressed inhaul cable mainly has two schemes according to the construction method of a steel structure:
the first scheme is as follows: for a truss structure with a smaller span, after the steel structure is integrally assembled on the jig frame, the prestressed stay cable is constructed on the jig frame, and the prestressed stay cable is integrally hoisted to a structure part along with the steel structure after the stay cable construction is completed;
scheme II: the steel structure is assembled in high altitude by sections in situ, and the prestressed stay cable is subjected to cable hanging construction by adopting a method of matching a plurality of cranes;
above two kinds of schemes all have strict requirements to the engineering environment, need have enough big vacant lot to carry out the setting up of bed-jig below the steel construction promptly, or can satisfy the space that crane and crane jib moved, and in most coal yard transformation, all there are coal piling and large-scale machinery such as stacker-reclaimer below the structure, can't satisfy crane operation requirement for a long time, and current construction technology can't be applicable to the construction under the various construction environmental conditions, and the range of application is little.
Disclosure of Invention
The invention provides a construction process of a large-span truss string arch truss dragline, which is not limited by a construction site and a lower environment, does not need the cooperation of a crane in the whole process, and has flexible construction, high safety and high construction efficiency.
A construction process for an ultra-large span truss cable with a string arch comprises the following steps:
s1: installing and fixing a hanging rope slideway:
1) Welding a steel strand slideway fixing base plate at the upper chord position of the truss with the guy cable head ear plate, wherein the length of a welding seam meets the requirement of safe use;
2) 2 1860-grade phi 15.2 steel strands are used as a cable hanging slideway, so that the safety storage coefficient is increased while the weight of the cable is borne;
3) Lifting the slideway steel strand to a working platform by using a chain block, and fixing the slideway steel strand on a welded base plate by using an anchorage device clamping piece;
4) Applying a tension force value of 100KN to a single steel strand by adopting a 24-ton jack, so that the steel strand is tightened to keep a horizontal straight state, and a straight slideway is provided for installing a stay cable;
5) Finally, installing a clamping piece anti-anchor-falling pressing plate at the end part of the anchor after tensioning is finished, and ensuring the safe operation of the construction of the hanging cable;
s2: type selection of traction equipment: the model of the winch is determined through calculation, the required traction force F is larger than the sum of the weight of the stay rope and the friction resistance, and the calculation is carried out according to the following formula:
F≥W(1+f)k
in the formula: f-tractive effort;
w is the gross weight of the guy cable;
f is friction coefficient, and 0.16-0.19 is taken;
k is margin coefficient, and is 1.1-1.4.
S3: the crane is matched with the rope unfolding and hanging rope:
1) A cable releasing disc is placed on one side of the string arch truss, and a winch is fixed on the other side of the string arch truss;
2) After the truss is spliced, dragging a steel wire rope of a winch to one side of a rope releasing disc, adjusting the length of a screw thread of a cable head of a guy cable to be the maximum, reserving a screw thread connection state of about 50mm at each end, and preparing to hang the cable;
3) When the stay cable moves about 5 meters every time, the stay cable is hung on a hanging cable slideway by adopting a hanging strip and a pulley, and 2 adjacent hanging points are alternately arranged on 2 steel stranded wires, so that the stay cable is ensured to be straight, and the installation difficulty of a cable head at the other end is reduced;
4) Along with the arrangement of the stay cable lifting point, the position of a crane lifting hook is changed every 30m or so until the cable body is pulled to the other end of the structure;
s4: the guy cable head pin shaft is fixedly installed:
1) Installing a cable head pin shaft at one end;
2) Installing a cable head pin shaft at the other end by adopting a cable hanging tool and a chain block matching method;
3) After the cable is hung, recording the tension value of the hanging cable and the exposed length of the screw rod to the millimeter accuracy;
s5: dismantling a hanging rope slideway: after the inhaul cable is installed, the steel strand of the cable-hanging slideway is timely disassembled, and the steel strand is loosened to the operating platform, so that the inhaul cable can be conveniently hung on a next track.
S6: installing a cable clamp of a guy cable: influenced by the manufacturing and assembling precision of the steel structure, after the inhaul cable is installed, the vertical distance between the stay bar and the inhaul cable is observed, and if the distance is shorter, the cable clamp can be directly installed; if the distance is far away, the inhaul cable can be firstly tensioned to a partial force value, so that the inhaul cable is tightened, and the cable clamp is installed when the inhaul cable is close to the support rod, so that the construction efficiency is improved.
S7: tensioning a stay rope:
1) Selecting tensioning jacks with corresponding specifications and models to be arranged at the end part of the cable head, and symmetrically tensioning at two ends;
2) The cable force and deformation are double controlled during cable tensioning, so that the requirements of controlling node deformation and cable internal force are met within the allowable error range;
3) Carrying out step loading on the truss guy cable to simulate, calculate and analyze an actual tension value;
4) Starting an oil pump and a jack for tensioning, controlling the loading and oil feeding speeds, and screwing an adjusting screw in time in the oil feeding process;
5) Monitoring the arching deformation height of the structure at any time in the tensioning process, measuring the exposed length of the adjusting screw rod, and making a record;
as an improvement, in S1, a steel strand is used as a hanging rope slideway, construction is carried out on the side of the structure and on an operation platform, and the construction is not limited by a field below the structure and an operation space.
As an improvement, 2 steel stranded wires are adopted as a cable hanging slideway in the S1, a clamping piece anti-falling anchor pressing plate is arranged at the end part of the anchor, and cable hanging construction safety is improved through multiple prevention lines.
As an improvement, the cable head installation in S4 adopts any one of the following methods:
the method comprises the following steps: when the finished cable is customized, a plurality of cable head connecting rods with different lengths are customized or the finished cable head screw threads are lengthened to adjust the length, so that the influence of the assembly precision of the on-site components on the hanging cable is avoided;
the second method comprises the following steps: and applying a certain initial force value to the stay cable, tensioning the stay cable to the structure mounting position, and mounting the end cable head pin shaft.
As an improvement, the two ends of the cable head are in fork lug type, and a clamping tool matched with U-shaped round steel is adopted as a tensioning fixing measure.
As an improvement, in the step S7, according to a simulation analysis calculation result, the cable force is graded and stretched to a cable force value in one time according to a ratio of 20% → 40% → 60% → 80% → 100%, so that the number of times of cable force adjustment is reduced, and the structural stress is more accurate.
As an improvement, the oil feeding time in S7 is not less than 0.5min.
Compared with the prior art, the invention has the advantages that:
(1) according to the method, finite element calculation software is adopted to carry out detailed simulation analysis on the stay cable construction process, so that the verticality of the stay rod and the structure of the stay cable after construction are ensured to reach a design state;
(2) according to the invention, through simulation analysis, the construction process is simplified, the actual tension value of each cable is given in one step, the tension adjusting times of the cable are reduced, and the structure stress is more accurate;
(3) the steel strand is used as the hanging rope mounting slideway, so that the construction method is not limited by a construction site and a lower environment, does not need the cooperation of a crane in the whole process, and has wide application range;
(4) according to the invention, a single cable spreading construction procedure is omitted, the installation of the cable can be carried out while the cable is released, and the construction efficiency is improved;
(5) the invention abandons the traditional tension connection mode and adopts U-shaped round steel as a tension connection measure, so that the construction is more flexible and portable.
The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the construction process of the present invention.
Figure 2 is a schematic view of the lanyard installation of the present invention.
FIG. 3 is a three-dimensional perspective layout view of the enclosed canopy of the coal yard of the present invention.
FIG. 4 is a schematic view of the vertical arrangement of the prestressed stay of the present invention.
Fig. 5 is a schematic diagram of a main truss node according to an embodiment of the invention.
FIG. 6 is a schematic view of a prestressed steel cable according to an embodiment of the present invention.
Fig. 7 is a perspective view of a cable clamp according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present invention will be described in further detail with reference to the accompanying drawings.
1. With the attached drawings 1-4, a super-large span truss chord arch stay cable construction process is characterized in that: the construction process comprises the following steps:
s1: installing and fixing a hanging rope slideway:
1) Welding a steel strand slideway fixing base plate at the upper chord position of the truss with the guy cable head ear plate, wherein the length of a welding seam meets the requirement of safe use;
2) 2 1860-grade phi 15.2 steel strands are used as a cable hanging slideway, so that the safety storage coefficient is increased while the weight of the cable is borne;
3) Lifting the slideway steel strand to a working platform by using a chain block, and fixing the slideway steel strand on a welded base plate by using an anchorage device clamping piece;
4) Applying a tension value of 100KN to a single steel strand by adopting a 24-ton jack, so that the steel strand is tightened to keep a horizontal straight state, and a straight slideway is provided for installing a stay cable;
5) Finally, installing a clamping piece anti-anchor-falling pressing plate at the end part of the anchor after tensioning is finished, and ensuring the safe operation of the construction of the hanging cable;
s2: type selection of traction equipment: the model of the winch is determined through calculation, the required traction force F is larger than the sum of the weight of the stay cable and the friction resistance, and the calculation is carried out according to the following formula:
F≥W(1+f)k
in the formula: f-tractive effort;
w is the gross weight of the guy cable;
f is friction coefficient, and 0.16-0.19 is taken;
k is margin coefficient, and is 1.1-1.4.
S3: the crane is matched with the rope unfolding and hanging rope:
1) A cable releasing disc is placed on one side of the truss string arch, and a winch is fixed on the other side of the truss string arch;
2) After the truss is spliced, drawing a steel wire rope of a winch to one side of a cable releasing disc, adjusting the length of a screw thread of a cable head of a stay cable to the maximum, reserving a screw thread connection state of about 50mm at each end, and preparing to hang the cable;
3) When the stay cable moves about 5 meters every time, the stay cable is hung on a hanging cable slideway by adopting a hanging strip and a pulley, and 2 adjacent hanging points are alternately arranged on 2 steel stranded wires, so that the stay cable is ensured to be straight, and the installation difficulty of a cable head at the other end is reduced;
4) Along with the arrangement of the inhaul cable hoisting point, the suspension position of the crane hook is changed every 30m or so until the cable body is pulled to the other end of the structure;
s4: the guy cable head pin shaft is fixedly arranged:
1) Mounting a cable head pin shaft at one end;
2) Installing a cable head pin shaft at the other end by adopting a cable hanging tool and a chain block matching method;
3) After the suspension cable is finished, recording the tension value of the suspension cable and the exposed length of the screw rod to the accuracy of millimeters;
s5: dismantling a hanging rope slideway: after the stay cable is installed, the steel strand of the hanging cable slideway is timely dismantled, and the steel strand is loosened to the operating platform, so that the stay cable is convenient to use for hanging the cable in the next channel.
S6: installing a cable clamp of a guy cable: influenced by the manufacturing and assembling precision of the steel structure, after the inhaul cable is installed, the vertical distance between the stay bar and the inhaul cable is observed, and if the distance is shorter, the cable clamp can be directly installed; if the distance is far away, the inhaul cable can be firstly tensioned to a partial force value, so that the inhaul cable is tightened, and the cable clamp is installed when the inhaul cable is close to the support rod, so that the construction efficiency is improved.
S7: tensioning a stay rope:
1) Selecting tensioning jacks with corresponding specifications and models to be arranged at the end part of the cable head, and symmetrically tensioning at two ends;
2) The cable force and deformation are controlled during cable tensioning, so that the requirements of controlling node deformation and cable internal force are met within the allowable error range;
3) Step loading the truss guy cable to a simulation computer for analyzing an actual tension value;
4) Starting an oil pump and a jack for tensioning, controlling the loading and oil feeding speeds, and screwing an adjusting screw in time in the oil feeding process;
5) Monitoring the arching deformation height of the structure at any time in the tensioning process, measuring the exposed length of the adjusting screw rod, and making a record;
examples
The method is characterized in that two stockings of a pelletizing stock yard A, B of a certain company are sealed, the sealed length is 650 meters, the span is 245 meters, a one-span and middle column-free truss mode is adopted, the stock yard is fully sealed in a mode of paving a color steel plate outside, the 245 meter span adopts an arch truss with two hinged ends, a truss-form tensioning section is a space triangular circular tube truss, a non-tensioning section adopts a triangular circular tube truss, in order to reduce arch foot thrust, on the premise of meeting the operating space of a bucket wheel machine, a 189.2 meter long balance guy cable is arranged at the elevation of about 37.2 meters, the guy cables adopt phi 7 multiplied by 91 semi-parallel steel wire bundle guy cables, 40 prestressed guy cables are arranged in the whole closed shed, the arrangement interval of the trusses is 15.9 meters, the three-dimensional perspective arrangement of the closed shed of the coal yard is shown in figure 3, and the vertical arrangement of the prestressed guy cables is shown in figure 4.
Because the stay cable and the steel component are indispensable important components in the structure, the construction of the stay cable and the steel component needs to be closely matched, the stress state of the structure is directly influenced in the prestress tensioning construction process, and the use safety performance of the structure is further influenced, therefore, the detailed construction simulation calculation analysis needs to be carried out on the tensioning process by adopting finite element calculation software before the construction of the prestress stay cable, so that the displacement of the node and the internal force of the component can be simultaneously and doubly controlled in the assembling and positioning process of the component, and the actual tension value of each cable is finally determined.
In this embodiment, the span of the truss with the string arch is large, each structural unit is assembled and tensioned from one end to the other end by adopting an in-situ segmented assembling construction method, the single trusses in the structure are connected through the secondary trusses, mainly planar force transmission is used, and the synergistic effect among the main trusses is not obvious, so that one truss can be taken for analysis, and construction simulation analysis is performed on the truss by using Midas software to obtain the cable force change value in each construction stage as shown in the following table:
1. slideway fixation
1. Welding a steel strand slideway fixing base plate at the upper chord position of the truss with the guy cable head ear plate, wherein the length of a welding seam meets the requirement of safe use;
2. 2 1860-grade phi 15.2 steel stranded wires are used as a cable-hanging slideway, so that the safety storage coefficient is increased while the weight of a cable is borne;
3. lifting the slideway steel strand to a working platform by using a chain block, and fixing the slideway steel strand on a welded base plate by using an anchorage device clamping piece;
4. applying a tension value of 100KN to a single steel strand by adopting a 24-ton jack, so that the steel strand is tightened to keep a horizontal straight state, and a straight slideway is provided for installing a guy cable;
5. finally, a clamping piece anti-anchor-falling pressing plate is arranged at the end part of the anchor after tensioning is finished, so that the safe operation of the construction of the hanging rope is ensured;
2. type selection of traction equipment:
the type of a winch for pulling the stay cable needs to be determined through calculation, the required traction force F is larger than the sum of the weight of the stay cable and the friction resistance, and the calculation is carried out according to the following formula:
F≥W(1+f)k
in the formula: f-tractive effort;
w is the gross weight of the guy cable;
f is friction coefficient, and 0.16-0.19 is taken;
k is margin coefficient, and is 1.1-1.4.
3. Installing a stay cable:
1. a cable releasing disc is placed on one side of the truss string arch, and a winch is fixed on the other side of the truss string arch;
2. after the truss is spliced, drawing a steel wire rope of a winch to one side of a cable releasing disc, adjusting the length of a screw thread of a cable head of a stay cable to be the maximum, reserving a screw thread connection state of about 50mm at each end, and preparing to hang the cable;
3. when the stay cable moves about 5 meters every time, the stay cable is hung on a hanging cable slideway by adopting a hanging strip and a pulley, and 2 adjacent hanging points are alternately arranged on 2 steel strands, so that the stay cable is ensured to be straight, and the installation difficulty of a cable head at the other end is reduced;
4. along with the arrangement of a cable hanging point, the position of a crane hook is changed every 30m or so until a cable body is pulled to the other end of the structure, and a cable head pin shaft at the end is installed;
5. the installation of the cable head at the other end is affected by the assembly and installation precision of a steel structure, a certain distance is always reserved between the pin shaft hole and the cable head, a method of assembling, chain backing and tensioning tools by a cable suspension worker is needed, a certain initial force value is applied to the cable, the cable is tensioned to the structure installation position, the installation of the pin shaft of the cable head at the end is completed, and the cable suspension installation schematic diagram is shown in fig. 2;
6. after the suspension cable is finished, recording the tension value of the suspension cable and the exposed length of the screw rod to the accuracy of millimeters;
4. dismantling a hanging rope slideway:
after the stay cable is installed, the steel strand of the hanging cable slideway is timely dismantled, and the steel strand is loosened to the operating platform, so that the stay cable is convenient to use for hanging the cable in the next channel.
5. Installing a cable clamp:
influenced by the manufacturing and assembling precision of the steel structure, after the inhaul cable is installed, the vertical distance between the stay bar and the inhaul cable is observed, and if the distance is short, the cable clamp can be directly installed; if the distance is far away, the inhaul cable can be firstly tensioned to a partial force value, so that the inhaul cable is tightened, and the cable clamp is installed when the inhaul cable is close to the support rod, so that the construction efficiency is improved.
6. Tensioning a stay rope:
1. the guy cable of the super-large span truss string arch truss adopts two-end symmetrical tensioning;
2. selecting a tensioning jack with a corresponding specification and model according to a simulation analysis result, and allocating two pieces of equipment to each end of a fork lug type rope head and one piece of equipment to each end of a cold-cast pier head rope head;
3. the cable force and deformation are controlled in a double mode during cable tensioning, so that the requirements of the design on the deformation of a control node and the internal force of the cable are met, and the allowable error range is reached;
4. according to simulation analysis, a method of graded loading is adopted for the truss according to the given tensile force value, and the truss is graded and tensioned to the given tensile force value according to the ratio of 20% → 40% → 60% → 80% → 100%;
5. starting an oil pump and a jack for tensioning, slowly loading the tensioning jack, controlling the oil feeding speed, wherein the oil feeding time is not less than 0.5min, and screwing an adjusting screw in time in the oil feeding process;
6. and monitoring the arching deformation height of the structure at any time in the tensioning process, measuring the exposed length of the adjusting screw rod, and recording.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A super-large span truss string arch stay cable construction process is characterized in that: the construction process comprises the following steps:
s1: installing and fixing a hanging rope slideway:
1) Welding a steel strand slideway fixing base plate at the upper chord position of the truss with the guy cable head ear plate, wherein the length of a welding seam meets the requirement of safe use;
2) 2 1860-grade phi 15.2 steel strands are used as a cable hanging slideway, so that the safety storage coefficient is increased while the weight of the cable is borne;
3) Lifting the slideway steel strand to a working platform by using a chain block, and fixing the slideway steel strand on a welded base plate by using an anchorage device clamping piece;
4) Applying a tension force value of 100KN to a single steel strand by adopting a 24-ton jack, so that the steel strand is tightened to keep a horizontal straight state, and a straight slideway is provided for installing a stay cable;
5) Finally, installing a clamping piece anti-anchor-falling pressing plate at the end part of the anchor after tensioning is finished, and ensuring the safe operation of cable hanging construction;
s2: type selection of traction equipment: the model of the winch is determined through calculation, the required traction force F is larger than the sum of the weight of the stay rope and the friction resistance, and the calculation is carried out according to the following formula:
F≥W(1+f)k
in the formula: f-tractive effort;
w is the gross weight of the guy cable;
f is friction coefficient, and 0.16-0.19 is taken;
k is margin coefficient, and is 1.1-1.4.
S3: the crane is matched with the rope unfolding and hanging rope:
1) A cable releasing disc is placed on one side of the truss string arch, and a winch is fixed on the other side of the truss string arch;
2) After the truss is spliced, dragging a steel wire rope of a winch to one side of a rope releasing disc, adjusting the length of a screw thread of a cable head of a guy cable to the maximum, reserving a screw thread connection state of 50mm at each end, and preparing to hang the cable;
3) When the stay cable moves for 5 meters every time, the stay cable is hung on a hanging cable slideway by adopting a hanging strip and a pulley, and 2 adjacent hanging points are alternately arranged on 2 steel stranded wires, so that the stay cable is ensured to be straight, and the installation difficulty of a cable head at the other end is reduced;
4) With the arrangement of the cable hanging point, the hanging position of the crane hook is changed every 30m or so until the cable body is pulled to the other end of the structure;
s4: the guy cable head pin shaft is fixedly arranged:
1) Installing a cable head pin shaft at one end;
2) Installing a cable head pin shaft at the other end by adopting a cable hanging tool and a chain block matching method;
3) After the cable is hung, recording the tension value of the hanging cable and the exposed length of the screw rod to the millimeter accuracy;
s5: dismantling a hanging rope slideway: after the stay cable is installed, the steel strand of the hanging cable slideway is timely dismantled, and the steel strand is loosened to the operating platform, so that the stay cable is convenient to use for hanging the cable in the next channel.
S6: installing a cable clamp of a guy cable: influenced by the manufacturing and assembling precision of the steel structure, after the inhaul cable is installed, the vertical distance between the stay bar and the inhaul cable is observed, and if the distance is shorter, the cable clamp can be directly installed; if the distance is far away, the inhaul cable can be firstly tensioned to a partial force value, so that the inhaul cable is tightened, and the cable clamp is installed when the inhaul cable is close to the support rod, so that the construction efficiency is improved.
S7: tensioning a stay rope:
1) Selecting tensioning jacks with corresponding specifications and models to be arranged at the end part of the cable head, and symmetrically tensioning at two ends;
2) The cable force and deformation are controlled during cable tensioning, so that the requirements of controlling node deformation and cable internal force are met within the allowable error range;
3) Step loading is carried out on the truss to a given tension value;
4) Starting an oil pump and a jack for tensioning, controlling the loading and oil feeding speeds, and screwing an adjusting screw in time in the oil feeding process;
5) Monitoring the arching deformation height of the structure at any time in the tensioning process, measuring the exposed length of the adjusting screw rod and making a record;
s6: installation of stay cable support rods and cable clamps: the vertical distance between a stay cable support rod and a stay cable needs to be closely observed when the cable is hung under the influence of the manufacturing and assembling precision of a steel structure, and if a cable head at the other end is not installed, the distance between the stay cable and the stay cable is very small, a cable clamp needs to be installed in advance before the cable is hung; otherwise, after the guy cable is hung and tensioned, the guy cable clamps are installed one by one from one end to the other end of the hanging basket hung by a crane.
2. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: and S1, the steel strand is used as a hanging rope slideway, construction is carried out on the side of the structure and on an operation platform, and the construction is not limited by a field below the structure and an operation space.
3. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: and 2 steel strands are adopted as a hanging rope slideway in the S1, a clamping piece anti-falling anchor pressing plate is arranged at the end part of the anchor, and the hanging rope construction safety is improved by multiple defense lines.
4. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: the cable head installation in S4 adopts any one of the following methods:
the method comprises the following steps: when the finished cable is customized, a plurality of cable head connecting rods with different lengths are customized or the finished cable head screw threads are lengthened to adjust the length, so that the influence of the assembly precision of the on-site components on the hanging cable is avoided;
the second method comprises the following steps: and applying a certain initial force value to the inhaul cable, tensioning the inhaul cable to the structure mounting position, and mounting the cable head pin shaft at the end.
5. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: the two ends of the cable head are in fork lug type, and a clamping tool matched with U-shaped round steel is adopted as a tensioning fixing measure.
6. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: in S7, according to a simulation analysis calculation result, the cable force is graded according to the ratio of 20% → 40% → 60% → 80% → 100% and is tensioned to a cable force value once, the cable force adjusting times are reduced, and the structure stress is enabled to be more accurate.
7. The process for constructing the guy cable of the truss with the ultra-large span of the truss with the string arch according to claim 1, wherein the process comprises the following steps: and the oil feeding time in the S7 is not less than 0.5min.
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Cited By (1)
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