CN114575245B - Construction method of spatial main cable suspension bridge handrail rope - Google Patents
Construction method of spatial main cable suspension bridge handrail rope Download PDFInfo
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- CN114575245B CN114575245B CN202210217542.9A CN202210217542A CN114575245B CN 114575245 B CN114575245 B CN 114575245B CN 202210217542 A CN202210217542 A CN 202210217542A CN 114575245 B CN114575245 B CN 114575245B
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- 239000000725 suspension Substances 0.000 title claims abstract description 79
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000009434 installation Methods 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000011900 installation process Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 241000251468 Actinopterygii Species 0.000 claims description 4
- 210000001015 abdomen Anatomy 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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Abstract
The invention provides a construction method of a space main cable suspension bridge handrail rope, and relates to the technical field of bridge engineering. The invention aims at the installation and construction of the corresponding handrail ropes in an arrangement mode that the larger the distance between two main cables is close to the central position of a suspension bridge, the smaller the distance between bridge tower positions close to two ends of the suspension bridge is, wherein the handrail ropes are provided with a plurality of branch points, and the handrail ropes and the guys are installed in three batches, and the corresponding branch points are selected to carry out construction operation in the process of each batch of installation, thereby avoiding the conditions of mutual interference of construction processes, complex construction steps, complicated operation process and the like caused by only one-time installation mode.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a construction method of a space main cable suspension bridge handrail rope.
Background
The main push-towing rope of suspension bridge need set up the handrail rope after the construction is accomplished, and the operation that constructor carried out main push-towing rope operation maintenance can be assisted to the handrail rope, and traditional suspension bridge main push-towing rope interval is fixed invariable value, and the handrail rope also corresponds and sets up on the main push-towing rope that the interval is the invariable value, and the general realization of shaped steel support of handrail rope is fixed, leads to handrail rope tension-free or tension relatively less. The existing technical means can not meet the installation and construction requirements of the main cable and the handrail rope under the condition of variable distance.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a construction method for spatial main cable rope suspension bridge handrail, wherein before installing the handrail rope, a catwalk structure and two main cables are installed, two ends of the main cables are arranged at anchors at two ends of the suspension bridge, the two main cables are jacked out from the middle part of the suspension bridge through a jacking device to form an arrangement form in which the distance between the two main cables is larger at the position closer to the center of the suspension bridge and the distance between the two main cables is smaller at the position closer to the bridge tower at two ends of the suspension bridge, each main cable corresponds to one handrail group, each handrail group includes two handrail ropes, and the construction method for spatial main cable rope suspension bridge handrail rope includes the following steps:
(1) Two ends of the handrail rope are respectively arranged on the bridge towers at two ends of the suspension bridge, and the handrail rope is in a natural suspension state in which the handrail rope is linearly arranged in parallel;
(2) The handrail rope is pulled to a position near the upper part of the main cable through a pulling device;
(3) The handrail rope is provided with a plurality of branch points at intervals along the length direction, cable clamps with the same number as the branch points are installed on the main cable, one end of a guy cable is installed on the cable clamps through a heart ring, and the other end of the guy cable is a free end;
(4) The first installation of handrail rope and cable: setting a first tensioning branch point group and a first installation branch point group, wherein the first tensioning branch point group comprises a plurality of A1 branch points, the first installation branch point group comprises a plurality of A2 branch points, each branch point on the first tensioning branch point group is connected with a temporary tensioning device and then tensioned along the bending direction of the main cable, and each branch point on the first installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed;
(5) Installing the handrail rope and the inhaul cable in a second batch: setting a second tensioning branch point group and a second installation branch point group, wherein the second tensioning branch point group comprises a plurality of B1 branch points, the second installation branch point group comprises a plurality of B2 branch points, each branch point on the second tensioning branch point group is connected with a temporary tensioning device and then continues to be tensioned along the bending direction of the main cable, and each branch point on the second installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed;
(6) And (3) installing the handrail rope and the inhaul cable in a third batch: and a third tensioning branch point group and a third installation branch point group are arranged, the third tensioning branch point group comprises a plurality of C1 branch points, the third installation branch point group comprises a plurality of C2 branch points, each branch point on the third tensioning branch point group is connected with a temporary tensioning device and then is tensioned along the bending direction of the main cable, and each branch point on the third installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed.
Optionally, the pulling device utilizes the chain pulley to cooperate with the sling to connect the handrail rope, and stretches the handrail rope from a natural suspension straight line arrangement state to opposite sides into a fish belly shape, so as to pull the handrail rope to a position near the corresponding upper part of the main cable.
Optionally, the cable clamp is mounted by the following steps:
firstly, measuring the linearity of a main cable, lofting the antenna top lines, cable clamp tops and the longitudinal cable clamp positions of all cable clamps corresponding to the main cable to the upper position of the main cable by a measuring person, and marking;
the second step: hoisting the cable clamp to the top of the bridge tower, and transporting the cable clamp to a corresponding mounting position of the main cable through a crown block;
thirdly, limiting a cable clamp;
the fourth step: sequentially installing an upper half cable clamp and a lower half cable clamp above and below a main cable, penetrating the upper half cable clamp and the lower half cable clamp by using a screw, finely adjusting the position of the cable clamp after manual pre-tightening, and aligning the vertex of the upper half cable clamp with a corresponding point on the main cable;
the fifth step: and formally tensioning and locking the nut.
Optionally, the support rib plate is welded on the outer side walls, close to the two ends, of the upper half cable clamp and the lower half cable clamp, the first lug plate is welded on the upper portion of the upper half cable clamp, and the second lug plate is welded at the bottom of the lower half cable clamp.
Optionally, the length of the handrail rope is corrected: the length of each cable segment determined by each division point is L by taking the design temperature of 5 ℃ and the applied tension of 259.8kN as standards, wherein the length L is not required 0 Calculated elastic modulus E of 1.6X 10 8 kPa, calculated area A was 3.53X 10 -4 m 2 If the manufacturing tension N, the modulus of elasticity, the area or the manufacturing temperature of the handrail rope varies during the tensioning, the manufactured length of the handrail rope should be corrected. Manufactured length L of handrail rope m The calculation is as follows:
L m =L/(1+259.8/EA)*(1+N/EA)*(1+1.2×10 -5 Δ t )
Δ t and adjusting the manufacturing length of the handrail rope according to the temperature variation, wherein the temperature variation is 5 ℃ relative to the design temperature, the temperature is increased to be positive, and the temperature variation is reduced to be negative.
Optionally, the top of the tower at the two ends of the suspension bridge is provided with a portal frame, the two ends of the handrail rope are poured into the anchor head, and the handrail rope is fixed on the portal frame through the anchor head.
Optionally, the calculation formula of the elevation at any temperature across the midpoint is as follows:
H inner side =h Inner side －0.027482Δ t
H Outside side =h Outside side －0.027494Δ t
h Inner side Altitude h of the inner suspension bridge span midpoint Outside side Altitude, H, of the outer suspension bridge span midpoint Inner side Is the elevation value, H, of the inside handrail rope Outside side The height mark value of the outer side handrail rope, if the line shape of the handrail rope does not meet the requirement, the spacers are padded at the anchor heads at the two sides to adjust the height of the point value.
Optionally, 56 branch points including the branch point numbers of 0 to 55 are arranged on the handrail rope along the length direction,
the A1 division point comprises division points with division point numbers of 7, 14, 21, 28, 35, 42 and 49, and the A2 division point comprises division points with division point numbers of 7, 8, 13, 14, 15, 20, 21, 22, 27, 28, 29, 34, 35, 36, 41, 42, 43, 48 and 49;
the B1 point comprises points with point numbers of 4, 11, 18, 25, 31, 38, 45 and 52, and the B2 point comprises points with point numbers of 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 16, 17, 18, 19, 23, 24, 25, 26, 30, 31, 32, 33, 37, 38, 39, 40, 44, 45, 46, 47, 50, 51, 52, 53 and 54;
the C1 point includes points with point numbers of 0 and 55, and the C2 point includes points with point numbers of 0 and 55.
Optionally, in the first batch of installation processes of the handrail rope and the inhaul cable, when each branch point is a first set distance away from the initial position, tensioning is stopped and temporarily anchored, and at the moment, the tension of the temporary tensioning device is smaller than a first set tension;
stopping tensioning and temporarily anchoring after each branch point is a second set distance away from the initial position in the second batch of installation process of the handrail rope and the inhaul cable, wherein the tension of the temporary tensioning device is smaller than a second set tension;
stopping tensioning and temporarily anchoring after each branch point is a third set distance away from the initial position in the third batch of installation process of the handrail rope and the inhaul cable, wherein the tension of the temporary tensioning device is smaller than the third set tension;
the first set distance, the second set distance and the third set distance are sequentially increased in size, and the first set tension, the second set tension and the third set tension are sequentially decreased in size.
Optionally, the first set distance is 20cm, the second set distance is 30cm, and the third set distance is 80cm;
the first set tension is 25kN, the second set tension is 20kN, and the third set tension is 10kN.
As described above, the construction method of the spatial main cable suspension bridge handrail rope of the invention has at least the following beneficial effects:
the invention provides a construction method of a handrail rope of a spatial main cable suspension bridge, wherein the main cables and the handrail rope of the traditional suspension bridge are arranged in a relatively linear type interval fixed mode, and the invention aims at the installation construction of the corresponding handrail rope of the arrangement mode that the distance between the two main cables is larger when the distance is close to the central position of the suspension bridge, and the distance between bridge tower positions close to the two ends of the suspension bridge is smaller, wherein a plurality of branch points are arranged on the handrail rope, and the handrail rope and the guy cable are installed in three batches, and the corresponding branch points are selected to carry out construction operation in the process of each batch of installation, so that the conditions of mutual interference of construction procedures, complicated construction steps, complicated operation process and the like caused by only one-time installation mode are avoided;
meanwhile, the invention also correspondingly adjusts the length change and the tension change of the handrail rope caused by the straight line arrangement state of the handrail rope in the installation process to the fish-belly arrangement mode, because the handrail rope in the traditional scheme is arranged between suspension bridges in the straight line arrangement mode, the length of the handrail rope is set as a fixed value, the handrail rope in the invention is stretched from the straight line suspension state to the outside of two sides, the length and the self tension variation quantity must be considered, and the influence of comprehensive factors such as the manufacturing tension, the environment temperature, the elastic modulus, the manufacturing area and the like is comprehensively considered to correct the manufacturing length of the handrail rope, and meanwhile, gaskets are arranged at the positions of two ends of the handrail rope connected to a bridge tower according to the temperature influence to adjust the height of the division value so as to meet the requirement of the construction condition.
Drawings
FIG. 1 is a schematic view showing a natural suspension state of a handrail rope according to the present invention in a straight parallel arrangement;
FIG. 2 is a view illustrating a final state of a grab rope according to the present invention;
fig. 3 is a schematic view showing the connection of the main rope and the handrail rope in the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 3. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "three" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative terms may be changed or adjusted without substantial technical change.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
Referring to fig. 1 to 3, the invention provides a construction method of a spatial main cable suspension bridge handrail rope, which is characterized in that a catwalk structure and two main cables 01 are installed before installing the handrail rope, two ends of the main cables 01 are arranged on pylons at two ends of the suspension bridge, the two main cables 01 are jacked out from the middle part of the suspension bridge through a jacking device to form an arrangement form that the distance between the two main cables 01 is larger when the two main cables are closer to the center of the suspension bridge, and the distance between the two main cables 01 is smaller when the two main cables are closer to the pylons at two ends of the suspension bridge, each main cable 01 corresponds to a handrail group, each handrail group comprises two handrail ropes 1, and the construction method of the spatial main cable 01 suspension bridge handrail rope 1 comprises the following steps: (1) Two ends of the handrail rope 1 are respectively arranged on bridge towers at two ends of the suspension bridge, and the handrail rope 1 is in a natural suspension state in which the handrail ropes are linearly arranged in parallel; (2) The handrail rope 1 is pulled to a position near the upper part of the main cable 01 through a pulling device; (3) The handrail rope 1 is provided with a plurality of branch points at intervals along the length direction, cable clamps 2 with the same number as the branch points are arranged on the main rope 01, one end of a stay cable is arranged on the cable clamps 2 through a heart ring, and the other end of the stay cable is a free end; (4) installing the handrail rope 1 and the inhaul cable 3 in the first batch: setting a first tensioning branch point group and a first installation branch point group, wherein the first tensioning branch point group comprises a plurality of A1 branch points, the first installation branch point group comprises a plurality of A2 branch points, each branch point on the first tensioning branch point group is connected with a temporary tensioning device and then tensioned along the bending direction of the main cable 01, and each branch point on the first installation branch point group is connected with the free end of the stay cable 3 through a shackle after tensioning is completed; (5) second batch installation of the handrail rope 1 and the inhaul cable 3: setting a second tensioning branch point group and a second installation branch point group, wherein the second tensioning branch point group comprises a plurality of B1 branch points, the second installation branch point group comprises a plurality of B2 branch points, a temporary tensioning device is connected to each branch point on the second tensioning branch point group and then is tensioned along the bending direction of the main cable 01, and each branch point on the second installation branch point group is connected with the free end of the stay cable 3 through a shackle after tensioning is completed; (6) installing the handrail rope 1 and the inhaul cable 3 in a third batch: set up third stretch-draw minute point group and third installation minute point group, third stretch-draw minute point group includes a plurality of C1 minute point, and third installation minute point group includes a plurality of C2 minute point, continues along the crooked direction stretch-draw of main push-towing rope 01 after each minute point department on third stretch-draw minute point group connects interim tensioning device, and each minute point on third installation minute point group passes through the break-out and is connected with the free end of cable 3 after the stretch-draw is accomplished. As can be seen from fig. 1, two corresponding main cables 01 of the grab rope 1 in the suspension bridge are pushed away from the middle by the pushing device before installation and construction to form an arrangement form that the distance between the two main cables is larger when the two main cables are closer to the center of the suspension bridge and the distance between the bridge towers closer to the two ends of the suspension bridge is smaller, the grab rope 1 is installed on the bridge towers at the two ends of the corresponding suspension bridge, and at the moment, the grab rope 1 is in a natural suspension state in which the grab rope 1 is arranged in parallel in a straight line, and as can be seen from fig. 2, the grab rope 1 corresponds to the shape of the main cable 01 after installation and is also in an arrangement form similar to a fish belly shape. The invention provides a construction method of a handrail rope 1 of a space main cable 01 suspension bridge, the main cable 01 and the handrail rope 1 of the traditional suspension bridge are arranged in a relatively linear type interval fixed mode, the invention aims at the installation construction of the corresponding handrail rope 1 in an arrangement mode that the larger the distance between the two main cables 01 and the central position close to the suspension bridge is, the smaller the distance between bridge tower positions close to the two ends of the suspension bridge is, wherein a plurality of points are arranged on the handrail rope 1, the handrail rope 1 and a guy cable 3 are arranged in three batches, the corresponding points are selected to carry out construction operation in the process of each batch installation, and the conditions of mutual interference of construction procedures, complicated construction steps, complicated operation processes and the like caused by only one-time installation are avoided.
In this embodiment, the pulling device utilizes the chain block to cooperate with the hanging strip to connect the handrail rope 1, and stretches the handrail rope 1 from the natural suspension straight line arrangement state to opposite sides into a fish belly shape, thereby realizing pulling the handrail rope 1 to a position near the corresponding upper side of the main cable 01. The handle rope 1 is pulled to the upper position corresponding to the main cable 01 in a pre-installation mode, before the handle rope 1 is connected with the main cable 01 through the inhaul cable 3, the handle rope 1 is firstly pulled to the shape of the arrangement mode corresponding to the main cable 01, and then preparation is made for subsequent inhaul cable 3 connection, so that the subsequent inhaul cable 3 is more convenient to install.
In this embodiment, the mounting step of the cable clamp 2 is as follows: firstly, measuring the linearity of a main cable 01, lofting the zenith line, the vertex of a cable clamp 2 and the longitudinal position of the cable clamp 2 of all cable clamps 2 corresponding to the main cable 01 to the upper position of the main cable 01 by a measuring person, and marking; the second step is that: hoisting the cable clamp 2 to the top of the bridge tower, and transporting the cable clamp to the installation position corresponding to the main cable 01 through the overhead travelling crane; thirdly, limiting the cable clamp 2; the fourth step: sequentially installing an upper half cable clamp and a lower half cable clamp above and below a main cable 01, penetrating the upper half cable clamp and the lower half cable clamp by using a screw, finely adjusting the position of a cable clamp 2 after manual pre-tightening, and aligning the vertex of the upper half cable clamp with a corresponding point on the main cable 01; the fifth step: and formally tensioning and locking the nut. The cable clamp 2 is formed by splicing an upper half cable clamp and a lower half cable clamp, when the cable clamp 2 is installed on a main cable 01, the main cable 01 is combined and clamped in a cable hole in the main cable 01 through the upper half cable clamp and the lower half cable clamp, and then the cable clamp 2 is installed through matching and fixing of a bolt, formal tensioning and a locking nut.
In this embodiment, with the support rib plate welding on the lateral wall that is close to both ends of half cable clamp on half cable clamp and the lower half cable clamp, with the upper portion of first otic placode welding at half cable clamp on, with the bottom of second otic placode welding at half cable clamp down. Support floor on the cable clamp 2, first otic placode and second otic placode welding are on cable clamp 2, it is complicated to compare the molding process that leads to in the fashioned mode of whole casting, the whole defect of structure is many, the lower scheduling problem of material strength, can make the whole shaping of structure of cable clamp 2 more convenient through such welding mode, the holistic intensity of structure is better, the construction material who still can select to satisfy low temperature impact toughness requirement simultaneously welds, can expand the application scene of suspension bridge under cold environment better.
In the embodiment, because the handrail rope 1 in the traditional scheme is arranged between the suspension bridges in a linear type, the length of the handrail rope is set as a fixed value, while the handrail rope 1 in the invention is stretched from a linear parallel suspension state to the outside of two sides, the length and the variation of the tension of the handrail rope 1 are required to be considered, so that the invention correspondingly adjusts the length change and the tension change of the handrail rope 1 caused by the linear arrangement state of the handrail rope 1 to the fish-belly type arrangement mode in the installation process, and simultaneously corrects the manufacturing length of the handrail rope 1 by comprehensively considering the influence of comprehensive factors such as the manufacturing tension, the environmental temperature, the elastic modulus, the manufacturing area and the like so as to meet the requirements of construction conditions. Correcting the length of the handrail rope 1: the length of each cable segment determined by each division point is L by taking the design temperature of 5 ℃ and the applied tension of 259.8kN as standards, wherein the length L is not required 0 Has a calculated elastic modulus E of 1.6X 10 8 kPa, calculated area A was 3.53X 10 -4 m 2 If the manufacturing tension N, the modulus of elasticity, the area or the manufacturing temperature of the handrail rope 1 varies during the tensioning, the manufactured length of the handrail rope 1 should be corrected. Manufactured length L of handrail rope 1 m The calculation is as follows:
L m =L/(1+259.8/EA)*(1+N/EA)*(1+1.2×10 -5 Δ t )
Δ t the manufacturing length of the handrail rope 1 is adjusted according to the temperature variation of 5 ℃ relative to the design temperature, wherein the temperature is increased to be positive and decreased to be negative.
In this embodiment, the masts are installed on the top of the tower at both ends of the suspension bridge, both ends of the handrail rope 1 are poured into the anchor heads, and the handrail rope 1 is fixed on the masts through the anchor heads.
In this embodiment, the equation for the elevation at any temperature across the midpoint is as follows:
H inner side =h Inner side －0.027482Δ t
H Outside side =h Outside side －0.027494Δ t
h Inner side Altitude h of the inner suspension bridge span midpoint Outside side Altitude, H, of the outer suspension bridge span midpoint Inner side Is the level value H of the inside handrail rope 1 Outside side And if the line shape of the handrail rope 1 does not meet the requirement, pads can be padded at the anchor heads on the two sides to adjust the height of the point value. If the mid-span elevation is low, the mid-span division point can be lifted by stacking the gaskets on the anchor heads at the two ends so as to meet the construction requirement.
In this embodiment, 56 points including point numbers of 0 to 55 are arranged in the handrail rope 1 along the length direction, the A1 point includes points with point numbers of 7, 14, 21, 28, 35, 42 and 49, and the A2 point includes points with point numbers of 7, 8, 13, 14, 15, 20, 21, 22, 27, 28, 29, 34, 35, 36, 41, 42, 43, 48 and 49; the B1 division point comprises division points with division point numbers of 4, 11, 18, 25, 31, 38, 45 and 52, and the B2 division point comprises division points with division point numbers of 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 16, 17, 18, 19, 23, 24, 25, 26, 30, 31, 32, 33, 37, 38, 39, 40, 44, 45, 46, 47, 50, 51, 52, 53 and 54; the C1 minute point includes minute points with minute point numbers 0 and 55, and the C2 minute point includes minute points with minute point numbers 0 and 55. In the embodiment, the integral stress uniformity of the bearing rope and the convenience for field construction control are comprehensively considered, 56 branch points are arranged on the handrail rope 1, and are distributed in the length direction of the handrail rope 1, wherein the A1 branch points are selected to be the branch points with the branch point numbers of 7, 14, 21, 28, 35, 42 and 49, so that the selected points of the A1 branch points for the first tensioning are uniformly distributed near the eighth branch points on the handrail rope 1, therefore, the integral stress of the handrail rope 1 is uniform during the first tensioning, the situation that the tensioning device and the last guy rope 3 are broken due to overlarge local stress can not occur, the branch points A2 for the first installation of the guy rope 3 comprise all the branch points of the A1, and simultaneously comprise the near branch points of the A1; in the second tensioning, the points with the point numbers of 4, 11, 18, 25, 31, 38, 45 and 52 of the B1 are further uniformly selected on the basis of the first tensioning, so that the handrail rope 1 is always in a uniformly stressed state, the stress process is gradual, the tensioning quality is ensured, and the safety of the handrail rope is ensured at the same time, and the points B2 of the second installation of the stay rope 3 comprise all the points of the B1 and the nearby points of the B1; and the third tensioning branch point and the third installation branch point only leave two branch point numbers 0 and 55 at the two ends of the handrail rope 1, and the connection is completed by sequentially installing.
In the embodiment, in the first batch of installation processes of the handrail rope 1 and the inhaul cable 3, when each branch point is a first set distance away from the initial position, tensioning is stopped and temporary anchoring is carried out, and at the moment, the tension of the temporary tensioning device is smaller than a first set tension; in the second batch of installation process of the handrail rope 1 and the inhaul cable 3, when each branch point is a second set distance away from the initial position, tensioning is stopped and temporarily anchored, and the tension of the temporary tensioning device is smaller than a second set tension; in the third batch of installation process of the handrail rope 1 and the inhaul cable 3, when each branch point is a third set distance away from the initial position, tensioning is stopped and temporarily anchored, and the tension of the temporary tensioning device is smaller than the third set tension; the first set distance, the second set distance and the third set distance are sequentially increased in size, and the first set tension, the second set tension and the third set tension are sequentially decreased in size. The determined set tension and the set distance are determined according to the ultimate bearing stress of the temporary stretching device, and the first, second and third set tensions are decreased gradually because the second stretching is based on the first stretching, and the third stretching is further performed on the basis of the first and second stretching, so that the required stretching tension is decreased gradually to meet the set requirement. In this embodiment, the first set distance is 20cm, the second set distance is 30cm, and the third set distance is 80cm; the first set tension is 25kN, the second set tension is 20kN, and the third set tension is 10kN.
In summary, the invention provides a construction method of a spatial main cable 01 suspension bridge handrail rope 1, the main cable 01 and the handrail rope 1 of the traditional suspension bridge are arranged in a relatively linear type fixed interval mode, and the invention aims at the installation construction of the corresponding handrail rope 1 in an arrangement mode that the distance between two main cables 01 is larger when the distance between the two main cables is close to the central position of the suspension bridge and the distance between bridge tower positions close to two ends of the suspension bridge is smaller, wherein a plurality of branch points are arranged on the handrail rope 1, and the handrail rope 1 and the guy cable 3 are installed in three batches, and the corresponding branch points are selected to carry out construction operation in the process of each batch of installation, so that the conditions of mutual interference of construction procedures, complicated construction steps, complicated operation process and the like caused by the mode of only one-time installation are avoided, the invention not only simplifies equipment and constructors required by construction, but also can sequentially realize sequential gradual and gradual installation in multiple batches of installation modes, and the stress is more uniform, and the condition that the overlarge tension of the handrail rope 1 and the damage of the corresponding stretching device can not be caused by one-time; meanwhile, the invention also correspondingly adjusts the length change and the tension change of the handrail rope 1 caused by the straight line arrangement state of the handrail rope 1 to the fish-belly type arrangement mode in the installation process, because the handrail rope 1 in the traditional scheme is arranged between suspension bridges in a straight line type arrangement mode, the length of the handrail rope is set as a fixed value, the handrail rope 1 in the invention is stretched from the straight line suspension state to the outside of two sides, the length and the variation of the self tension are required to be considered, the manufacturing length of the handrail rope 1 is corrected by comprehensively considering the influence of comprehensive factors such as the manufacturing tension, the environmental temperature, the elastic modulus, the manufacturing area and the like, and meanwhile, gaskets are arranged at the positions where the two ends of the handrail rope 1 are connected to a bridge tower according to the influence of the temperature to adjust the height of the division value so as to meet the requirement of the construction condition. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, it is intended that all such modifications and variations as would be obvious to one skilled in the art are included within the scope of this disclosure and the present invention.
Claims (10)
1. The construction method of the spatial main cable suspension bridge handrail rope is characterized in that a catwalk structure and two main cables are installed before the handrail rope is installed, the two ends of the main cables are arranged at anchor positions at the two ends of a suspension bridge, the two main cables are jacked out from the middle part of the suspension bridge through a jacking device to form an arrangement form that the distance between the two main cables is larger when the two main cables are closer to the center position of the suspension bridge, the distance between the two main cables is smaller when the two main cables are closer to a bridge tower at the two ends of the suspension bridge, each main cable corresponds to one handrail group, each handrail group comprises two handrail ropes, and the construction method of the spatial main cable suspension bridge handrail rope comprises the following steps:
(1) Two ends of the handrail rope are respectively arranged on the bridge towers at two ends of the suspension bridge, and the handrail rope is in a natural suspension state in which the handrail rope is linearly arranged in parallel;
(2) The handrail rope is pulled to a position near the upper part of the main cable through a pulling device;
(3) The handrail rope is provided with a plurality of branch points at intervals along the length direction, cable clamps with the same number as the branch points are installed on the main cable, one end of a guy cable is installed on the cable clamps through a heart ring, and the other end of the guy cable is a free end;
(4) The first installation of handrail rope and cable: setting a first tensioning branch point group and a first installation branch point group, wherein the first tensioning branch point group comprises a plurality of A1 branch points, the first installation branch point group comprises a plurality of A2 branch points, each branch point on the first tensioning branch point group is connected with a temporary tensioning device and then tensioned along the bending direction of the main cable, and each branch point on the first installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed;
(5) Installing the handrail rope and the inhaul cable in a second batch: setting a second tensioning branch point group and a second installation branch point group, wherein the second tensioning branch point group comprises a plurality of B1 branch points, the second installation branch point group comprises a plurality of B2 branch points, each branch point on the second tensioning branch point group is connected with a temporary tensioning device and then continues to be tensioned along the bending direction of the main cable, and each branch point on the second installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed;
(6) Installing the handrail rope and the inhaul cable in a third batch: and setting a third tensioning branch point group and a third installation branch point group, wherein the third tensioning branch point group comprises a plurality of C1 branch points, the third installation branch point group comprises a plurality of C2 branch points, each branch point on the third tensioning branch point group is connected with a temporary tensioning device and then is tensioned along the bending direction of the main cable continuously, and each branch point on the third installation branch point group is connected with the free end of the stay cable through a shackle after tensioning is completed.
2. The construction method of the spatial main cable suspension bridge handrail rope according to claim 1, characterized in that: the pulling device utilizes the chain pulley to be matched with the hanging strip to be connected with the handrail rope, the handrail rope is stretched from the natural suspension straight line arrangement state to two opposite sides to be in a fish belly shape, and the handrail rope is pulled to a position nearby the corresponding upper part of the main cable.
3. The construction method of the spatial main cable suspension bridge handrail rope according to claim 1, characterized in that: installing the cable clamp: firstly, measuring the linearity of a main cable, lofting the antenna top lines, cable clamp tops and cable clamp longitudinal positions of all cable clamps corresponding to the main cable to the upper positions of the main cable by a measuring person, and marking; the second step is that: hoisting the cable clamp to the top of the bridge tower, and transporting the cable clamp to a mounting position corresponding to the main cable through a crown block; thirdly, limiting a cable clamp; the fourth step: sequentially installing an upper half cable clamp and a lower half cable clamp above and below a main cable, penetrating the upper half cable clamp and the lower half cable clamp by using a screw, finely adjusting the position of the cable clamp after manual pre-tightening, and aligning the vertex of the upper half cable clamp with a corresponding point on the main cable; the fifth step: and formally tensioning and locking the nut.
4. The construction method of the spatial main cable suspension bridge handrail rope according to claim 3, wherein: the support rib plates are welded on the outer side walls, close to two ends, of the upper half cable clamp and the lower half cable clamp, the first lug plates are welded on the upper portion of the upper half cable clamp, and the second lug plates are welded at the bottom of the lower half cable clamp.
5. The construction method of the spatial main cable suspension bridge handrail rope according to claim 1, characterized in that: correcting the length of the handrail rope: at a design temperature of 5 ℃ and under a tension of 2598kN is the standard, the length of each cable section determined by each point is L, wherein the length L is the unresponsive length 0 Has a calculated elastic modulus E of 1.6X 10 8 kPa, calculated area A was 3.53X 10 -4 m 2 If the manufacturing tension N, the elastic modulus, the area or the manufacturing temperature of the handrail rope changes during the tensioning process, the manufacturing length of the handrail rope should be corrected, and the manufacturing length L of the handrail rope should be corrected m The calculation is as follows:
L m =L/(1+259.8/EA)*(1+N/EA)*(1+1.2×10 -5 Δ t )
Δ t the temperature is changed to be positive and negative in a temperature change amount of 5 ℃ relative to the design temperature, and the manufacturing length of the handrail rope is adjusted according to the temperature change amount.
6. The construction method of the spatial main cable suspension bridge handrail rope according to claim 5, wherein: and installing a portal frame on the top of the tower at the two ends of the suspension bridge, pouring the two ends of the handrail rope into the anchor heads, and fixing the handrail rope on the portal frame through the anchor heads.
7. The construction method of the spatial main cable suspension bridge handrail rope according to claim 6, characterized in that:
the altitudes at any temperature across the midpoint were calculated as follows:
H inner side =h Inner side －0.027482Δ t
H Outside side =h Outside side －0.027494Δ t
h Inner side Altitude h of the inner suspension bridge span midpoint Outside side Altitude, H, of the outer suspension bridge span midpoint Inner side Is the elevation value, H, of the inside handrail rope Outside side And if the line shape of the handrail rope does not meet the requirement, padding pads at anchor heads on two sides to adjust the height of the point value.
8. The construction method of the spatial main cable suspension bridge handrail rope according to claim 1, characterized in that: 56 minutes comprising the minutes 0 to 55 are arranged on the handrail rope along the length direction,
the A1 division point comprises division points with division point numbers of 7, 14, 21, 28, 35, 42 and 49, and the A2 division point comprises division points with division point numbers of 7, 8, 13, 14, 15, 20, 21, 22, 27, 28, 29, 34, 35, 36, 41, 42, 43, 48 and 49;
the B1 division point comprises division points with division point numbers of 4, 11, 18, 25, 31, 38, 45 and 52, and the B2 division point comprises division points with division point numbers of 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 16, 17, 18, 19, 23, 24, 25, 26, 30, 31, 32, 33, 37, 38, 39, 40, 44, 45, 46, 47, 50, 51, 52, 53 and 54;
the C1 point includes points with point numbers of 0 and 55, and the C2 point includes points with point numbers of 0 and 55.
9. The construction method of the spatial main cable suspension bridge handrail rope according to claim 8, wherein: stopping tensioning and temporarily anchoring after each branch point is a first set distance away from the initial position in the first batch of installation process of the handrail rope and the inhaul cable, wherein the tension of the temporary tensioning device is smaller than the first set tension; stopping tensioning and temporarily anchoring after each branch point is a second set distance away from the initial position in the second batch of installation process of the handrail rope and the inhaul cable, wherein the tension of the temporary tensioning device is smaller than a second set tension; stopping tensioning and temporarily anchoring after each branch point is a third set distance away from the initial position in the third batch of installation process of the handrail rope and the inhaul cable, wherein the tension of the temporary tensioning device is smaller than the third set tension; the first set distance, the second set distance and the third set distance are sequentially increased in size, and the first set tension, the second set tension and the third set tension are sequentially decreased in size.
10. The construction method of the spatial main cable suspension bridge handrail rope according to claim 9, wherein: the first set distance is 20cm, the second set distance is 30cm, and the third set distance is 80cm; the first set tension is 25kN, the second set tension is 20kN, and the third set tension is 10kN.
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