CN115162200A - Suspension bridge main cable strand erection and position restraining method - Google Patents
Suspension bridge main cable strand erection and position restraining method Download PDFInfo
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- CN115162200A CN115162200A CN202211010240.0A CN202211010240A CN115162200A CN 115162200 A CN115162200 A CN 115162200A CN 202211010240 A CN202211010240 A CN 202211010240A CN 115162200 A CN115162200 A CN 115162200A
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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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- 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention discloses a position restraining method for erecting a main cable strand of a suspension bridge, which comprises the following steps: s1: determining the spatial positions of components of a catwalk bearing rope, a portal frame and a bottom beam in the catwalk system, and determining the spatial coordinates of the catwalk system; s2: erecting a limiter, and installing the limiter on the bottom beam. The catwalk system is integrally connected with the erected early-stage cable strand and the cable strand to be adjusted through the limiting device to form a whole, the position of the cable strand to be adjusted is controlled in the cable strand erecting process, the rigidity of the catwalk system and the erected early-stage cable strand is larger than that of the cable strand to be adjusted, the transverse position of the cable strand to be adjusted can be effectively limited by the limiting device through the integral rigidity of the catwalk system and the erected early-stage cable strand, and the relative position measurement of the cable strand to be adjusted and the erected early-stage cable strand can still be carried out in strong wind weather. The shortcoming that the cable strand erection efficiency is low due to the fact that the cable strand erection process is easily affected by wind in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of main cable strand erection, in particular to a suspension bridge main cable strand erection position restraining method.
Background
At present, the main cable strand erection adjustment adopts a total station instrument to measure absolute sag and a caliper to measure relative sag, the transverse position of a to-be-adjusted cable strand is not limited in the cable strand erection process, and due to the limitation of a measuring method, the main cable strand needs to be basically static, and the requirements on wind and temperature environments are extremely high. For a large-span suspension bridge, when the wind speed exceeds 3 levels, the cable strand can generate obvious vibration, and the positions of the cable strand to be adjusted and the erected cable strand cannot be measured, so that the cable cannot be adjusted. Due to the harsh wind environment conditions required by cable adjustment, the erection period of the large-span suspension bridge cable strand can be prolonged, and the cable erection efficiency is extremely low particularly in a coastal strong wind area.
Disclosure of Invention
The invention aims to solve the problem that the existing method is low in cable strand erecting efficiency caused by the fact that the existing method is easily influenced by wind power in the cable strand erecting process, and provides a suspension bridge main cable strand erecting and position restraining method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a suspension bridge main cable strand erection position restraining method comprises the following steps:
s1: determining the spatial positions of components of a catwalk bearing rope, a portal frame and a bottom beam in the catwalk system, and determining the spatial coordinates of the catwalk system;
s2: erecting a limiter, installing the limiter on a bottom beam, and enabling the catwalk bearing cable, the bottom beam, the limiter and the portal frame to be positioned on the same vertical plane;
s3: installing distance measuring equipment, wherein the distance measuring equipment is used for measuring the relative position height difference of the erected early-stage cable strand and the cable strand to be adjusted;
s4: erecting and installing the early-stage cable strand, wherein the early-stage cable strand penetrates through the limiting device and is located above the limiting device to complete the erecting work of the early-stage cable strand, and the subsequent cable strand is erected by taking the erecting position of the early-stage cable strand as a reference;
s5: erecting and installing the cable strand to be adjusted, continuously passing the cable strand to be adjusted through a limiting device, limiting the cable strand to be adjusted through the limiting device, and simultaneously measuring the relative height difference between the cable strand to be adjusted and the erected early-stage cable strand through distance measuring equipment;
s6: adjusting the actual relative height difference of the cable strand to be adjusted and the erected early-stage cable strand to meet the requirement by using the actual relative height difference measured by the distance measuring equipment;
s7: and repeating the steps S5 and S6 until the erection of all the cable strands is completed.
Optionally, S1 further includes:
s11, erecting and installing a portal bearing cable, wherein the portal bearing cable is erected and installed at one end of the portal far away from the catwalk bearing cable, and the portal bearing cable is arranged above the catwalk bearing cable in parallel;
s12: the transverse channel is erected between the two catwalk systems, and the transverse channel is used for connecting the two catwalk systems.
Optionally, the strand to be adjusted is located and arranged in the limiting area of the limiter, and the distance measuring direction of the distance measuring equipment is perpendicular to the limiting area of the limiter.
Optionally, the cable strand to be adjusted is stacked up and down with the erected earlier-stage cable strand in the limiting area.
Optionally, the cable strand erection at the earlier stage of S4 further includes:
s41: and erecting the first cable strand in the early stage, erecting the first cable strand by a marking method or an absolute sag method, and constructing erection coordinates by matching with distance measuring equipment to be used as a reference for subsequent cable strand erection positioning.
Optionally, the stopper is in be provided with a plurality ofly on the catwalk system, it is a plurality of the stopper sets up along catwalk bearing cable trend.
Optionally, the overall rigidity of the whole connection body of the catwalk system and the limiter, the erected cable strand and the cable strand to be adjusted is respectively K 1 、K 2 、K 3 Acting transverse loads respectively F 1 、F 2 、F 3 ；
In S4, K 1 ＞＞K 2 ＞K 3 And K is 2 ＝nK 3 ；
F 1 ＞F 2 ＞F 3 And F is 1 ＝mF 2 ,F 2 ＝aF 3 ；
Wherein a is more than or equal to 1, m is more than 1, and n is more than or equal to 1.
Optionally, in S6 and/or S7, K 2 ≥K 1 ＞K 3 ；
F 2 ≥F 1 ＞F 3 。
Optionally, the transverse displacement of the whole connection body of the catwalk system and the limiter, the erected cable strand and the cable strand to be adjusted is delta 1 、δ 2 、δ 3 ；
Wherein, the first and the second end of the pipe are connected with each other,
the beneficial effects of the invention are as follows:
in the embodiment of the invention, the catwalk system is integrally connected with the erected early-stage cable strand and the cable strand to be adjusted through the limiting device to form a whole, the position of the cable strand to be adjusted is controlled in the process of erecting the cable strand, and because the rigidity of the catwalk system and the erected early-stage cable strand is greater than that of the cable strand to be adjusted, the transverse position of the cable strand to be adjusted can be effectively limited by utilizing the integral rigidity of the catwalk system and the erected early-stage cable strand through the limiting device, the relative position measurement of the cable strand to be adjusted and the erected early-stage cable strand can still be carried out in strong wind weather, so that the problem of difficulty in linear adjustment is solved, the erecting work efficiency of the cable strand is improved, and manpower, material resources and time cost are saved. The shortcoming that the cable strand erection efficiency is low due to the fact that the cable strand erection process is easily affected by wind in the prior art is solved.
Drawings
Fig. 1 is an overall installation and installation schematic view of a suspension bridge main cable strand installation and restraining method provided in an embodiment of the present invention;
fig. 2 is a schematic structural installation diagram of a stopper part of a suspension bridge main cable strand erection restraining method provided in the embodiment of the present invention (when a cable strand is installed in S4);
fig. 3 is a schematic structural installation diagram of a stopper part of a suspension bridge main cable strand erection restraining method provided in an embodiment of the present invention (when a cable strand is installed in S6 or S7).
The symbols in the figures are as follows:
1. a catwalk system; 11. a catwalk load bearing cable; 12. a gantry; 121. a bottom beam; 13. a transverse channel; 14. a gantry bearing cable;
2. a stopper;
3. the cable strand at the early stage;
4. and (5) cable strands to be adjusted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Examples
Referring to fig. 1-3, in the method for erecting and restraining the main cable strand of the suspension bridge, a plurality of limiters 2 are arranged, so that the limiters 2 integrate a catwalk system and/or an erected early-stage cable strand 3 into a whole, and the limiters 2 restrain the transverse vibration of the cable strand 4 to be adjusted by wind power by using the rigidity of the integrated catwalk system and the erected early-stage cable strand 3, so that the transverse relative position between the cable strand 4 to be adjusted and the erected early-stage cable strand 3 is kept stable. Meanwhile, a distance measuring device is used for collecting relative height difference curves of the cable strand 4 to be adjusted and the cable strand 3 in the erected early stage, the relative height difference of the cable strand in a static state is obtained, the relative position relation of the cable strand 4 to be adjusted and the cable strand 3 in the erected early stage can be measured, and the measuring result is reliable, so that the problem of difficulty in cable adjustment is solved, the erection work efficiency of the cable strand is improved, the influence of wind power on the cable strand during erection is reduced, and the erection and installation efficiency of the cable strand is guaranteed.
Specifically, the bit suppression method comprises the following steps:
s1: and determining the spatial positions of the components in the catwalk bearing rope 11, the gantry 12 and the bottom beam 121 in the catwalk system, so as to determine the spatial coordinates of the catwalk system 1. Through confirming the relative spatial position of catwalk bearing cable 11, portal 12, floorbar 121, confirm the whole installation coordinate of catwalk system 1, let constructor be convenient for following subsequent installation operation. Meanwhile, the method can ensure that the subsequent construction is carried out stably and sequentially.
S2: erecting a limiter 2, installing the limiter 2 on a bottom beam 121, enabling a catwalk bearing cable 11, the bottom beam 121, the limiter 2 and a door frame 12 to be located on the same vertical plane, and sequentially arranging the catwalk bearing cable 11, the bottom beam 121, the limiter 2 and the door frame 12 from bottom to top; by installing the stopper 2 on the bottom beam 121, the bottom beam 121 is connected with the door frame 12 and the catwalk bearing rope 11, so that a relatively stable whole is constructed among the stopper 2, the door frame 12, the bottom beam 121 and the catwalk bearing rope 11. Let the catwalk system 1 and the stopper 2 be connected together, have rigidity and wind resistance greater than the strand 4 of waiting to transfer.
S3: installing a distance measuring device (not shown in the figure) for measuring the relative position height difference of the erected previous cable strand 3 and the cable strand 4 to be adjusted; through installation range finding equipment, can be in real time to the earlier stage cable strand 3 that has erect and wait to transfer the position of cable strand 4 to carry out the accuracy to the accuse to the follow-up 4 positions of erectting of waiting to transfer the cable strand.
S4: referring to fig. 2, an early-stage cable strand 3 is erected and installed, the early-stage cable strand 3 penetrates through the limiting device 2 and is located above the limiting device 2, the erection work of the early-stage cable strand 3 is completed, and the erection position in the early-stage cable strand 3 is used as a reference coordinate to perform subsequent cable strand erection; herein, the early-stage cable strand 3 is erected on the limiter 2, the erected early-stage cable strand 3 is integrally connected with the catwalk bearing cable 11, the door frame 12 and the bottom beam 121 through the limiter 2, and the integral wind resistance among the limiter 2, the catwalk bearing cable 11, the door frame 12 and the bottom beam 121 is effectively improved. Utilize the stopper to integrate earlier stage cable 3 that has erect with catwalk system 1 is whole promptly and link up, effectual whole promotion catwalk system 1, stopper 2 and erect the wind-resistant ability between earlier stage cable 3, erect for subsequent cable installation and provide stable erection installation environment. In this step, in order to further determine the coordinate accuracy of the previous strand 3, when the first strand of the previous strand 3 is actually installed, the first previous strand 3 is erected by a marking method or an absolute sag method, and a basic erection coordinate is established on the stopper by matching with a distance measuring device. Namely, the other strands except the first strand in the previous strand 3 are all erected with reference to the erection position of the first strand as a coordinate standard. In addition, the subsequent cable strands 4 to be adjusted are all erected and installed by taking the position of the first cable strand in the former cable strand 3 as a coordinate reference, so that the accuracy of erection and installation of the cable strands 4 to be adjusted and the former cable strand 3 is ensured.
S5: erect the installation and treat to transfer strand 4, treat to transfer strand 4 and continue to pass stopper 2, stopper 2 utilizes its spacing region to treat to transfer strand 4 spacing, measures the relative difference in height between treating to transfer strand 4 and the earlier stage strand 3 that has erect simultaneously through range unit. Waiting to transfer strand 4 and passing stopper 2, waiting to transfer strand 4 this moment and being located range unit below, and be located the top of erecting earlier stage strand 3, waiting to transfer strand 4 and spacing through spacing region on stopper 2, reduce and wait to transfer strand 4 and receive the vibration influence that wind-force blown, provide stable construction environment for the follow-up position adjustment of waiting to transfer strand 4.
S6: the relative height difference measured by the distance measuring equipment is utilized to adjust the positions of the cable strand 4 to be adjusted and the erected early-stage cable strand 3; and measuring the actual relative height difference between the erected early-stage cable strand 3 and the cable strand 4 to be adjusted by using distance measuring equipment, and adjusting the actual relative height difference between the cable strand 4 to be adjusted and the erected early-stage cable strand 3 to meet the requirement. Simultaneously, the data measured by the distance measuring equipment are analyzed, so that the constructors can monitor the position area of the cable strand 4 to be adjusted, and the subsequent constructors can conveniently adjust the erection of the cable strand 4 to be adjusted. It should be noted that, in this embodiment, for adjusting the relative height difference position between the cable strand 4 to be adjusted and the erected early-stage cable strand 3, a laser distance measuring device, an ultrasonic distance measuring device, or an infrared device may be used, and the setting position of the distance measuring device is not limited to be set on the limiter 2, but may be set on the gantry or on the gantry bottom beam 121, as long as the distance measuring device can accurately measure the relative height difference between the erected early-stage cable strand and the cable strand to be adjusted. In this embodiment, preferably, the distance measuring end of the distance measuring device is perpendicular to the erected front cable strand 3 and the cable strand 4 to be adjusted.
S7: and repeating the step S6 until the erection of all the cable strands is completed. Through will subsequent waiting to transfer strand 4 to install on the strand that has erect, let stopper 2 continue to install subsequent waiting to transfer strand 4, utilize range finding equipment to treat simultaneously and transfer strand 4 and the position of the earlier stage strand 3 that has erect to carry out the range finding adjustment, continue to erect the installation and wait to transfer strand 4, accomplish the installation operation of erectting to whole strands. Note that the former strand 3 in S4 is defined as a strand installed before the strand 4 to be adjusted. The former strand 3 in S5, S6, and S7 includes all the installed strands in S4, and also includes the erected and installed strand 4 to be adjusted. That is, the former strand 3 in S5, S6, S7 includes not only all the former strands 3 in S4 but also the strand 4 to be adjusted, which has been erected and adjusted in position.
In this embodiment, in order to ensure the stability of the overall strength of the door frame 12 and the catwalk load bearing rope 11 in the catwalk system 1, the method further includes in S1: s11, erecting and installing a portal bearing cable 14, wherein the portal bearing cable 14 is erected and installed at one end, far away from the catwalk bearing cable 11, of the portal 12, and the portal bearing cable 14 is arranged above the catwalk bearing cable 11 in parallel; through set up portal bearing cable 14 above portal 12, let portal bearing cable 14 and catwalk bearing cable 11 atress jointly, let portal 12 and floorbar 121 on the catwalk system 1 stable wholly, also ensured follow-up stable supporting role to the whole of installing stopper 2. S12: the transverse channel 13 is erected, the transverse channel 13 is erected between the two catwalk systems 1, and the transverse channel 13 is used for connecting the two catwalk systems 1. The cross passage 13 is arranged, and the two catwalk systems 1 are connected through the cross passage 13 to form a stable wind-resistant whole body, so that the stability of the subsequent installation environment for all the cable strands is ensured. And simultaneously, the whole wind resistance stability on the two catwalk systems 1 is greatly enhanced. It should be noted that the catwalk system 1 includes: catwalk bearing cable 11, portal, sill 121, cross passage 13 and portal bearing cable 14.
In this embodiment, in order to ensure the accuracy of the distance measuring device in monitoring the position of the cable strand 4 to be adjusted, the cable strand 4 to be adjusted penetrates through the limiting area of the limiter 2, and the distance measuring direction of the distance measuring device is perpendicular to the limiting area of the limiter 2. Namely, the cable strand 4 to be adjusted and the erected cable strand are arranged below the distance measuring end of the distance measuring equipment. Also wait to transfer strand 4 and erect the strand on stopper 2, and be in distance measuring equipment's range finding orientation to in distance measuring equipment utilizes the range finding end to treat to transfer strand 4 and erect the installation relative position of strand, also guaranteed that follow-up constructor treats the erection installation position adjustment convenience and the accuracy of transferring strand 4, the effectual installation effectiveness who treats to transfer strand 4 that has improved. It should be noted that, when the distance measuring equipment is used for positioning and measuring the distance between the cable strand 4 to be adjusted and the erected early cable strand 3, the distance measuring equipment is not limited to be arranged on the limiter 2, and can also be arranged on the gantry or the catwalk system 1. Namely, the distance measuring device has various distance measuring modes, and can realize the real-time monitoring of the relative position height difference of the erected early-stage cable strand 3 and the cable strand 4 to be adjusted, so that the method is not summarized.
In addition, in this embodiment, in order to ensure the stability of the installation and adjustment of the erection cable, the plurality of stoppers 2 are provided on the catwalk system 1, and the plurality of stoppers 2 are provided along the direction of the catwalk bearing cable 11. That is, in this embodiment, stopper 2 is provided with a plurality ofly on catwalk system 1, lets a plurality of stoppers 2 divide the region at catwalk system 1 to the earlier stage cable strand 3 that has erect and wait to transfer cable strand 4 and carry out spacing work, has guaranteed stopper 2 to the earlier stage cable strand 3 that has erect and wait to transfer the stability of spacing work of cable strand 4. Meanwhile, by arranging the plurality of limiters 2 and the distance measuring equipment arranged on the limiters 2, the working procedures of erection installation and position adjustment between the strands 4 to be adjusted are simplified, and the whole quantity of constructors is reduced. In addition, in this embodiment, the plurality of stoppers 2 are arranged on the catwalk system 1, and the plurality of stoppers 2 integrally link the catwalk load-bearing rope 11, the gantry 12, the bottom beam 121, the erected fore-cable strand 3, and the to-be-adjusted cable strand 4, so that the wind resistance among the catwalk system 1, the stoppers 2, the erected fore-cable strand 3, and the to-be-adjusted cable strand 4 is effectively improved. Namely, the catwalk limits the transverse position of the cable strand 4 to be adjusted by using the rigidity of the catwalk and the erected early-stage cable strand 3 through the limiter 2, so that the relative position measurement of the cable strand 4 to be adjusted and the erected early-stage cable strand 3 can be still carried out when the working wind speed reaches 6 grades of wind, the problem of difficulty in linear adjustment is solved, the cable strand erecting work efficiency is improved, and manpower, material resources and time cost are saved.
In this embodiment, in order to guarantee distance measuring equipment can carry out subregion range finding in batches to spacing region on the stopper 2, avoids waiting to transfer and appears the range finding interference between strand 4, distance measuring equipment is provided with a plurality ofly, and is a plurality of distance measuring equipment sets up side by side on the stopper 2, and is a plurality of distance measuring equipment's the equal perpendicular to spacing region of range finding end, it is a plurality of simultaneously distance measuring equipment's range finding end corresponds the cable strand 3 in earlier stage of having erect that is in same vertical line respectively and waits to transfer strand 4. In this embodiment, the erected cable strand and the cable strand 4 to be adjusted in the limiting area on the limiter 2 are divided into areas, each divided area corresponds to one distance measuring device, and the accuracy of distance measuring monitoring of the distance measuring devices is guaranteed.
The operation principle of the bit suppression method is as follows:
suppose that the overall rigidity of the whole connection of the catwalk system 1 (comprising the portal 12, the bottom beam 121, the catwalk bearing cable 11 and the portal bearing cable 14) and the limiter 2, the erected early-stage cable strand 3 and the cable strand 4 to be regulated is K 1 、K 2 、K 3 Acting transverse loads respectively F 1 、F 2 、F 3 . Wherein, because stopper 2 installs on floorbar 121 on portal 12, and stopper 2 whole size is less, and rigidity is far more than above three, can regard catwalk system 1 and stopper 2 as a whole here.
Most of the time for erecting and installing the front-stage cable strand 3 in S4, K 1 ＞＞K 2 ＞K 3 And K is 2 ＝nK 3 。F 1 ＞F 2 ＞F 3 And F is 1 ＝mF 2 ,F 2 ＝aF 3 (ii) a Wherein a is more than or equal to 1, m is more than 1, and n is more than or equal to 1.Namely K 2 Is K 3 N times of (F) 1 Is F 2 M times of (F) 2 Is F 3 A times of the length of the cable strand 3, because the cable strands are overlapped in the height direction,
the transverse displacement of the whole connecting body of the catwalk system 1 and the limiter 2, the erected cable strand 3 and the cable strand 4 to be adjusted is delta 1 、δ 2 、δ 3 Transverse displacement of the three
Without using the limiter 2, the lateral displacement delta of the catwalk system 1 is measured at a wind speed of 15m/s 1 Often more than 10m, the transverse displacement delta of the erected front cable strand 3 and the cable strand 4 to be adjusted 2 、δ 3 And is larger. Namely that
10m. When the number of the cable strands 3 in the erected early stage is two, the cable strand to be adjusted and the cable strand in the erected early stage have a transverse displacement difference and a displacement difference delta is minimum, and at the moment F 2 Is F 3 1.5 times of, K 2 About K 3 2 times of the total weight of the powder. Therefore, it is
2.5m. It can be seen that the difference in the transverse relative positions of the strand 4 to be adjusted and the pre-erected strand 3 is very large without using the stopper 2.
In S6 and S7, the cable strand 4 to be adjusted is continuously erected in the limiting area, and K is arranged at the moment 2 ≥K 1 ＞K 3 ，F 2 ≥F 1 ＞F 3 . Namely, the overall rigidity of the erected front cable strand 3 can be gradually increased along with the erection quantity of the cable strands 4 to be adjusted on the limiting area, and is greater than or equal to the rigidity of the catwalk system 1. The lateral load also increases slowly in the same way.
When the number of the cable strands is large, K 2 ＞K 1 ＞＞K 3 ，F 1 And F 2 The difference is not large and does not exceed F 3 20 times of the total weight of the powder. Thus, delta at a wind speed of 15m/s 3 ＞δ 1 > 10m, and delta 2 Often within 10m. It can be seen that, if the position limiter 2 is not used, the difference between the horizontal relative positions of the cable strand 4 to be adjusted and the cable strand 3 in the erected previous stage is very large.
If the stopper 2 is used, the lateral displacement between the three parts will be substantially the same.
Therefore, the transverse displacement of the cable strand 4 to be adjusted can be restrained by the aid of the rigidity of the catwalk system 1 and the erected early-stage cable strand 3 through the limiting stopper 2, measurement work can be smoothly conducted, and the cable strand erecting work efficiency is improved.
Based on the working principle, the catwalk bearing rope 11, the portal 12, the bottom beam 121 and the portal bearing rope 14 are integrally connected with the erected fore-stage rope strand 3 and the rope strand 4 to be adjusted through the limiting device 2 to form a whole, the position of the rope strand 4 to be adjusted is controlled in the rope strand erecting process, and because the rigidity of the catwalk system 1 and the erected fore-stage rope strand 3 is larger than that of the rope strand 4 to be adjusted, the transverse displacement position of the rope strand 4 to be adjusted can be limited through the limiting device 2 by utilizing the rigidity of the catwalk system 1 and the erected fore-stage rope strand 3, so that the relative position measurement of the rope strand 4 to be adjusted and the erected fore-stage rope strand 3 can be still carried out when the working wind speed reaches 6 th wind, the problem of difficulty in linear adjustment is solved, the rope strand erecting work efficiency is improved, and the manpower and time costs are saved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A suspension bridge main cable strand erection position restraining method is characterized by comprising the following steps:
s1: determining the spatial positions of components of a catwalk bearing rope, a portal frame and a bottom beam in the catwalk system, and determining the spatial coordinates of the catwalk system;
s2: erecting a limiter, installing the limiter on a bottom beam, and enabling the catwalk bearing cable, the bottom beam, the limiter and the portal frame to be positioned on the same vertical plane;
s3: installing distance measuring equipment, wherein the distance measuring equipment is used for measuring the relative position height difference of the erected early-stage cable strand and the cable strand to be adjusted;
s4: erecting and installing the early-stage cable strand, wherein the early-stage cable strand penetrates through the limiting device and is located above the limiting device to complete the erecting work of the early-stage cable strand, and the subsequent cable strand is erected by taking the erecting position of the early-stage cable strand as a reference;
s5: erecting and installing the cable strand to be adjusted, continuously passing the cable strand to be adjusted through a limiting device, limiting the cable strand to be adjusted through the limiting device, and simultaneously measuring the relative height difference between the cable strand to be adjusted and the erected early-stage cable strand through distance measuring equipment;
s6: adjusting the actual relative height difference of the cable strand to be adjusted and the erected early-stage cable strand to meet the requirement by using the actual relative height difference measured by the distance measuring equipment;
s7: and repeating the steps S5 and S6 until the erection of all the cable strands is completed.
2. The suspension bridge main cable strand erection restraining method according to claim 1, wherein S1 further comprises:
s11, erecting and installing a portal bearing cable, wherein the portal bearing cable is erected and installed at one end of the portal far away from the catwalk bearing cable, and the portal bearing cable is arranged above the catwalk bearing cable in parallel;
s12: the transverse channel is erected between the two catwalk systems, and the transverse channel is used for connecting the two catwalk systems.
3. The suspension bridge main cable strand erection and restraining method according to claim 2, wherein the strand to be adjusted is located and arranged in a limiting area of the limiter, and a distance measuring direction of the distance measuring equipment is perpendicular to the limiting area of the limiter.
4. The suspension bridge main cable strand erection and restraining method according to claim 3, wherein the strand to be adjusted is stacked with the erected earlier strand in the restraining area.
5. The suspension bridge main cable strand erection restraining method according to claim 4, wherein the cable strand erection at the previous stage of S4 further comprises:
s41: and erecting the first cable strand in the early stage, erecting the first cable strand by a marking method or an absolute sag method, and constructing erection coordinates by matching with distance measuring equipment to be used as a reference for subsequent cable strand erection positioning.
6. The method for restraining the erection of the main cable strands of the suspension bridge according to any one of claims 1 to 5, wherein a plurality of said stoppers are arranged on the catwalk system, and a plurality of said stoppers are arranged along the direction of the catwalk load-bearing cables.
7. The erection and restraining method for main cable strands of suspension bridge as claimed in claim 6, wherein the overall rigidity of the whole connecting body of the catwalk system and the stopper, the erected cable strands and the cable strands to be adjusted is K 1 、K 2 、K 3 Acting transverse loads respectively F 1 、F 2 、F 3 ；
In S4, K 1 ＞＞K 2 ＞K 3 And K is 2 ＝nK 3 ；
F 1 ＞F 2 ＞F 3 And F is 1 ＝mF 2 ,F 2 ＝aF 3 ；
Wherein a is more than or equal to 1, m is more than 1, and n is more than or equal to 1.
8. A suspension bridge main cable strand erection restraint method according to claim 7, wherein in S6 and/or S7, K 2 ≥K 1 ＞K 3 ；
F 2 ≥F 1 ＞F 3 。
9. The erection and restraining method for main cable strands of a suspension bridge according to claim 7 or 8, wherein the transverse displacement of the whole connecting body of the catwalk system and the stopper, the erected cable strands and the cable strands to be adjusted is delta 1 、δ 2 、δ 3 ；
Wherein the content of the first and second substances,
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| CN112815840A (en) * | 2020-12-31 | 2021-05-18 | 中交第二航务工程局有限公司 | General cable strand linear measuring method of suspension bridge based on machine vision |
| CN213896724U (en) * | 2020-09-16 | 2021-08-06 | 中国铁建港航局集团有限公司 | Adjustable cable strand shaping limiting device |
| CN114108480A (en) * | 2021-12-01 | 2022-03-01 | 中交第二航务工程局有限公司 | Full-section downward-sliding erection structure of suspension bridge catwalk and construction method thereof |
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| JPH11117224A (en) * | 1997-10-16 | 1999-04-27 | Nippon Steel Corp | Erection method of suspension bridge cable |
| CN101418542A (en) * | 2008-11-21 | 2009-04-29 | 上海市政工程设计研究总院 | Cable system construction method of spatial self-anchored rope-suspension bridge |
| CN202500091U (en) * | 2011-12-01 | 2012-10-24 | 中交二公局第二工程有限公司 | Shape retainer in strand erection in suspension bridge main cable PPWS construction |
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