CN107066724B - Track linear control method for multi-wire cable-stayed railway bridge - Google Patents
Track linear control method for multi-wire cable-stayed railway bridge Download PDFInfo
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Abstract
The invention belongs to the technical field of bridge engineering, and particularly relates to a track linear control method for a multi-line cable-stayed railway bridge, which comprises the following steps: a: determining a railway line construction sequence; b: building a foundation; c: constructing accessories; c1: adjusting the linear shape of the beam body: after the step C is finished, detecting the line shape of the beam body, and then adjusting the tensioning degree of the stay cable; d: and (6) laying a track. The rail line shape control method of the multi-line cable-stayed railway bridge is specifically directed at the multi-line cable-stayed railway bridge, vehicles can be communicated successively, the railway line which is communicated with the vehicles firstly is put into use in advance, so that the railway can be ensured to be put into use as early as possible, the economy in the railway construction process is further ensured, the line shape influence of the follow-up track laying work on the laid rails is greatly reduced, and further, the good line shape of each line rail is ensured.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a track linear control method for a multi-line cable-stayed railway bridge.
Background
With the rapid development of economic society and the high-speed progress of science and technology, the transportation industry has also made a great deal of development, and in the whole transportation industry, railway transportation becomes an extremely important transportation mode due to the advantages of high accuracy, strong continuity, large transportation volume, low transportation cost and the like.
In the technical field of railway design and construction at present, various novel devices and novel construction methods are applied, the traditional construction difficulty is overcome, the construction level of a railway line is further improved, in order to meet higher transportation efficiency, the design ideas in two aspects are usually adopted at present, on one hand, the railway line is increased, for example, a single-track railway is changed into a double-track railway or a multi-track railway; another aspect is to increase the speed of train operation.
The multi-line railway becomes the mainstream trend of the railway construction work at present due to the characteristics of large transportation amount and high transportation efficiency. In terms of the multi-track railway, the multi-track railway has two or more than two railway lines, and two or more trains can simultaneously and respectively run on different railway lines, so that the transportation capacity of the railway lines is greatly improved.
With the increasing speed of railway transportation, higher requirements are made on the construction quality of railway lines, and in the actual railway design and railway construction work, the inventor finds that at present, the defects exist in the construction of multi-line railways, specifically the following:
because the multi-line railway has at least two railway lines, in the process of construction, if all the railway lines are constructed together and the rails are laid simultaneously, the manpower and material resources required to be simultaneously input are huge, and because of the limitation of the construction field and the mutual influence when all the railway lines are laid, the construction difficulty is increased, although all the railway lines of the whole railway can be constructed simultaneously, the whole construction period is long, and the economy of railway construction is not facilitated.
If the railway lines are constructed one by one, namely, the construction of a certain railway line is firstly completed, the vehicle is ensured to be communicated in advance, then the next railway line is constructed, the operation is repeated in this way, the construction of the whole railway is completed, by adopting the mode, the railway line which is constructed in the early stage can be communicated in advance, and is put into use in advance, although the economy of railway construction is improved, the inventor finds that the problem still exists by adopting the current mode: in railway construction, the track line shape is an important index for evaluating the railway construction quality and is a decisive factor for whether a railway can realize high-speed traffic, however, in actual design and construction, the inventor finds that if the construction of railway lines is carried out one by one, the construction of the railway lines constructed later inevitably affects the previously completed railway lines, particularly, the track line shape of the previously completed railway lines is sharply reduced, so that the track line shapes constructed in different stages have great difference, the smoothness of the track structure is affected, the travelling comfort is reduced, and even safety accidents are caused, which is the fundamental reason for the method to restrict the traffic speed of the railway lines, and particularly, the adverse effect caused by the adverse effect is more remarkable for the construction precision structure such as a high-speed multi-line railway bridge.
Especially for a multi-line cable-stayed railway bridge, in the traditional construction process, the alignment of a beam body is usually adjusted by adopting a stay cable, and for the multi-line railway, if each railway line is constructed one by one, when the alignment of the track is adjusted by adopting the stay cable, the alignment of each track is not consistent, so that the accurate adjustment of the alignment of each track in the adjusting step is difficult to ensure.
Therefore, based on the above, in terms of a multi-line cable-stayed railroad bridge, there is an urgent need to design a method for controlling the linear shape of a multi-line cable-stayed bridge track, which can ensure construction economy, reduce construction difficulty, and ensure that each line track has a good linear shape.
Disclosure of Invention
The invention aims to: aiming at the defects of poor economy, high construction difficulty and difficulty in controlling the track linearity in the design and construction of the conventional multi-line cable-stayed railway bridge, the track linearity control method which can ensure good economy, reduce the construction difficulty and ensure that the tracks of each railway line have good linearity is provided.
In order to achieve the above purpose, the invention provides the following technical scheme:
a track linear control method for a multi-wire cable-stayed railway bridge comprises the following steps: the method comprises the following steps:
a: determining a railway line construction sequence: determining the construction period of each railway line of the multi-line railway;
b: building a foundation: building a beam body and a bridge deck of the cable-stayed railway bridge, installing a stay cable, paving a track bed on the bridge deck, and then arranging sleepers on the track bed, wherein the track bed in the step is the track bed of all railway lines, and the sleepers in the step are the sleepers of all railway lines;
c: and (3) accessory construction: arranging other accessories, except for the rail and the member for fixing the rail, at the design position, wherein the accessories are constant-load parts positioned on the foundation in the railway line;
c1: adjusting the linear shape of the beam body: after the step C is finished, detecting the line shape of the beam body, and then adjusting the stay cables to ensure that the line shape precision of the beam body meets the design requirement;
d: track laying: and B, paving the corresponding railway line track according to the railway line construction period determined in the step A.
The utility model provides a track alignment control method of multi-lane cable-stayed railway bridge, specifically be for multi-lane cable-stayed railway bridge, determine the construction period of each railway line of multi-lane railway first, then unified laying ballast bed on the bridge floor, and unified setting sleeper on the ballast bed, so, convenient the construction of each railway line basis, then, arrange other annex except track and the component that is used for fixed track in the design position, the annex is the dead load part that lies in the foundation in the railway line, according to the track laying order of step A, carry out the laying of track, adopt this mode, at first can make each railway line according to the logical car time sequence requirement of step A, the railway line that leads to the car first puts into use in advance, so, can guarantee the railway puts into use as early as possible, and then guaranteed the economy in the railway construction process, furthermore, the inventor finds that the weight of the track and the fixed components of the track are smaller than that of the foundation on the bridge floor, and the weight of other accessories and corresponding constant-load parts, particularly a track bed and a sleeper, is extremely large in the railway line which is constructed later, so that in the application, the components with the large weight ratio and the constant-load parts are firstly constructed in a unified manner and are firstly arranged on the foundation, and only the components of the track and the fixed track need to be considered in the subsequent track laying construction, so that the linear influence of the subsequent track laying operation on the laid track is greatly reduced, and the track of each line has good linear shape;
furthermore, due to the fact that the step C1 is arranged, the beam body is enabled to have good line shape through adjustment of the inhaul cable before track laying, and therefore the track is guaranteed to have good line shape accuracy after the track laying in the step D.
Preferably, the step a includes the following steps:
a1: modeling and analyzing the linear influence degree of the later laying track on the earlier laying track: establishing a corresponding model, designing different railway line construction sequences, and analyzing the influence degree of a later laid railway line on the track alignment of a previously laid railway line in various railway line construction sequences;
a2: determining a construction sequence: and B, sequencing the iron routes from top to bottom according to the influence degree of each iron route determined in the step A1 to obtain the laying sequence of each iron route.
In the method, modeling analysis is carried out on the multi-line cable-stayed railway bridge, so that the construction sequence of each railway line is obtained, the rail of the railway line with the largest influence on the track-laid line shape is laid firstly, the rail of the railway line with the smallest influence on the track-laid line shape is laid last, the track-laying sequence of each railway line is set, the influence of the later laid rail on the track-laid line shape is further reduced, and the rail of each railway line is further ensured to have good line shape.
Preferably, step E is further provided after step D: a step of detecting the line shape of the track,
the step E is as follows: after the track is laid, detecting the overall linear shape of the track, and when the track linear shape detection in the step E is unqualified, further setting a step F after the step E: and F, adjusting the track twice, namely adjusting the track through the step F until the linear shape meets the linear requirement of the track of the high-speed railway.
In this application, through setting up step E and F, detect and the secondary adjustment to the track alignment after the track laying is accomplished, ensure the linear high accuracy requirement of track, and then ensure the ride comfort of train operation.
Preferably, in the step F, at the linear abrupt change position of the track, the tensioning degree of the cable at the corresponding position is adjusted. Therefore, the adjustment is only carried out at the position where the track line shape changes suddenly, the adjustment mode is simple and direct, the effect is obvious, other parts can be prevented from being adjusted, and the adjustment of the track line shape is further facilitated.
Preferably, in step D, the laying sequence is determined according to step a2, and when laying a track, a pre-camber is provided to a previously laid track in a direction opposite to the direction in which a subsequently laid track affects the alignment of the track. Through setting up camber in advance, in this application, camber set up height and direction in advance, at first guarantee the normal driving of train, perhaps guarantee that the train goes with low-speed or medium speed, so, when one of them railway line or several railway line construction was built earlier and is accomplished, can come into operation at once, at this moment, can adopt the mode operation that is slightly less than design speed, after the whole constructions of all railway lines are accomplished, because lay the track at back and offset with the preceding orbital camber of laying in advance to the linear influence of track of laying at first, so, make each track all have high linear precision, at this moment, can satisfy the higher-speed operation of train.
Preferably, the pre-camber set in step D has the same height as the height of the linear influence of the post-laying track on the track. By adopting the scheme, the pre-camber and the linear influence are completely offset, and the linear precision of the track is further improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the railway can be ensured to be put into use as early as possible, and the economy of the multi-line cable-stayed railway bridge in the construction process is further ensured;
(2) the linear influence of the subsequent track laying work on the laid track is greatly reduced, and the good linear shape of each line track is further ensured.
Description of the drawings:
FIG. 1 is a block diagram illustrating the steps of the track alignment control method of the present application;
fig. 2 is a schematic structural view of a multi-wire cable-stayed railway bridge in the embodiment of the present application;
figure 3 is a schematic cross-sectional view of a multi-wire cable-stayed railway bridge according to an embodiment of the present application,
the following are marked in the figure: 1-track bed, 2-sleeper, 3-accessories, 4-track.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Detailed description of the preferred embodimentsthe embodiments, as shown in figures 1-3,
a track linear control method for a multi-wire cable-stayed railway bridge comprises the following steps: the method comprises the following steps:
a: determining a railway line construction sequence: determining the construction period of each railway line of the multi-line railway;
b: building a foundation: building a beam body and a bridge deck of a cable-stayed railway bridge, installing a stay cable, paving a track bed 1 on the bridge deck, and then arranging sleepers 2 on the track bed 1, wherein the track bed 1 in the step is the track bed 1 of all railway lines, and the sleepers 2 in the step are the sleepers 2 of all railway lines;
c: and (3) construction of accessories: arranging other accessories 3 than the rail 4 and the member for fixing the rail 4 at the design position, wherein the accessories 3 are constant-load parts on the foundation in the railway line;
c1: adjusting the linear shape of the beam body: after the step C is finished, detecting the line shape of the beam body, and then adjusting the stay cables to ensure that the line shape precision of the beam body meets the design requirement;
d: laying a track 4: and B, paving the rails 4 of the corresponding railway lines according to the railway line construction period determined in the step A.
The invention discloses a track 4 linear control method of a multi-line cable-stayed railway bridge, which is particularly used for the multi-line cable-stayed railway bridge, the construction period of each railway line of a multi-line railway is firstly determined, then a track bed 1 is uniformly paved on a bridge floor, sleepers 2 are uniformly arranged on the track bed 1, thus the construction of the foundation of each railway line is facilitated, then other accessories 3 except the track 4 and components for fixing the track 4 are arranged at the design position, the accessories 3 are constant-load components positioned on the foundation in the railway line, the track 4 is paved according to the track paving sequence of the step A, by adopting the mode, firstly, each railway line can be sequentially communicated according to the communication time sequence requirement of the step A, the railway line communicated with the vehicle firstly is put into use, thus, the railway line can be ensured to be put into use as early as possible, and the economy in the railway construction process is further ensured, further, the inventor finds that the weight of the track 4 and the fixed components of the fixed track 4 of the track are smaller than that of the foundation on the bridge floor in the railway line constructed later, and the weight of other accessories 3 and corresponding constant-load parts, particularly the track bed 1 and the sleeper 2, is extremely large, so that in the application, the components with large weight ratio and the constant-load parts are constructed uniformly firstly and are arranged on the foundation firstly, and only the components of the track 4 and the fixed track 4 need to be considered in the subsequent track laying construction, so that the linear influence of the subsequent track laying work on the laid track 4 is greatly reduced, and the good linear shape of each line track 4 is further ensured;
further, due to the fact that the step C1 is arranged, the beam body is enabled to have good line shape through adjustment of the inhaul cable before the track 4 is laid, and therefore the track 4 is guaranteed to have good line shape accuracy after the track 4 is laid in the step D.
Further, the step a includes the following steps:
a1: modeling and analyzing the linear influence degree of the later-laying track 4 on the earlier-laying track 4: establishing a corresponding model, designing different railway line construction sequences, and analyzing the influence degree of a later laid railway line on the alignment of a track 4 of a previously laid railway line in various railway line construction sequences;
a2: determining a construction sequence: and B, sequencing the iron routes from top to bottom according to the influence degree of each iron route determined in the step A1 to obtain the laying sequence of each iron route.
In the method, modeling analysis is carried out on the multi-line cable-stayed railway bridge, so that the construction sequence of each railway line is obtained, the track 4 of the railway line with the largest linear influence on the paved track 4 is paved firstly, and the track 4 of the railway line with the smallest linear influence on the paved track 4 is paved last, so that the paving sequence of each railway line is set, the linear influence of the later paved track 4 on the paved track 4 is further reduced, and the good linear shape of the track 4 of each railway line is further ensured.
Further, step E is further provided after step D: a step of detecting the line shape of the track 4,
the step E is as follows: after the track 4 is laid, detecting the overall linear shape of the track 4, and when the linear shape of the track 4 is unqualified in the step E, the step F is further arranged after the step E: and F, adjusting the track 4 linearly for the second time until the linear shape meets the linear requirement of the track 4 of the high-speed railway.
In this application, through setting up step E and F, detect 4 linear regulations of track after the track is laid and secondary adjustment, ensure 4 linear high accuracy requirements of track, and then ensure the ride comfort of train operation.
Further, in the step F, at the position where the track 4 changes linearly, the tensioning degree of the inhaul cable at the corresponding position is adjusted, so that the linear adjustment of the track 4 is realized. Therefore, the adjustment is only carried out at the position where the track 4 is linear and has a sudden change, the adjustment mode is simple and direct, the effect is obvious, other parts can be prevented from being adjusted, and the adjustment of the track 4 is further facilitated.
Further, in the step D, the laying order is determined in accordance with the step a2, and when laying the track 4, a pre-camber is set to the track 4 laid earlier, the pre-camber being in a direction opposite to a direction in which the track 4 laid later is linearly influenced by the track 4 laid earlier. Through setting up camber in advance, in this application, camber set up height and direction in advance, at first guarantee the normal driving of train, perhaps guarantee that the train goes with low-speed or medium speed, so, when one of them railway line or several railway line construction were built earlier and are accomplished, can come into use at once, at this moment, can adopt the mode operation that is slightly less than design speed, after the whole constructions of all railway lines are accomplished, because lay track 4 at the back and offset with the camber in advance of laying track 4 at the front to the linear influence of laying track 4 at the front, so, make each track 4 all have high linear precision, at this moment, can satisfy the higher-speed operation of train.
Further, the pre-camber set in the step D has the same height as that of the linear influence of the post-laying track 4 on the track 4. By adopting the scheme, the pre-camber and the linear influence are completely offset, and the linear precision of the track 4 is further improved.
The multi-line cable-stayed railway bridge adopting the track linear control method,
taking a bridge as an example, the bridge is a steel truss girder cable-stayed bridge, the span of a main bridge is 81m, 162m, 432m, 162m and 81m in sequence, as shown in fig. 1 and 2, the bridge is divided into an upper layer and a lower layer, the upper layer is 4 lines of passenger trains, two lines are passenger trains, mainly bullet trains or high-speed rails pass through, the other two lines are reserved passenger trains, and the lower layer is a freight line, namely, a six-line track comprising the passenger trains, the freight trains and the reserved passenger trains.
Due to the fact that the time sequence of actual operation (track laying) of railways at different positions and different lines exists, if the bridge deck linearity does not consider a proper adjusting and controlling method, the track linearity difference at different stages is larger, the smoothness of a track structure is affected, the travelling comfort is reduced, and even safety accidents are caused. Therefore, at the beginning of design, a linear adjustment control method for a complex multi-track railway large-span cable-stayed bridge needs to be provided to ensure that the track structure linearity meets the requirements at different stages, namely, the linear control method is adopted:
a1: modeling and analyzing the linear influence degree of the later-laying track 4 on the earlier-laying track 4: establishing a corresponding model, designing different railway line construction sequences, and analyzing the influence degree of a later laid railway line on the alignment of a track 4 of a previously laid railway line in various railway line construction sequences;
a2: determining a construction sequence: according to the influence degree of each railway line determined in the step A1, sequencing from top to bottom to obtain the construction sequence of each railway line, wherein the construction sequence comprises the following steps: sequentially comprises the following steps: a cargo line, a passenger line, a reserved passenger line.
Then the following steps are carried out:
b: building a foundation: building a beam body and a bridge deck of a cable-stayed railway bridge, installing a stay cable, paving a track bed 1 on the bridge deck, and then arranging sleepers 2 on the track bed 1, wherein the track bed 1 in the step is the track bed 1 of all railway lines, and the sleepers 2 in the step are the sleepers 2 of all railway lines;
c: and (3) construction of accessories: arranging other accessories 3 than the rail 4 and the member for fixing the rail 4 at the design position, wherein the accessories 3 are constant-load parts on the foundation in the railway line;
c1: adjusting the linear shape of the beam body: after the step C is finished, detecting the line shape of the beam body, and then adjusting the stay cables to ensure that the line shape precision of the beam body meets the design requirement;
d: laying a track 4: and B, paving the rails 4 of the corresponding railway lines according to the railway line construction period determined in the step A.
Finally, steps E and F are performed.
Through calculation, if a traditional laying mode is adopted, railway lines are constructed one by one, namely, a railway bed and other constant-load accessories of one railway line are firstly laid, then a track is laid on the railway bed, and after the railway line is finished, the next railway line is constructed, so that the influence of the reserved passenger train line on the passenger train line is large, the maximum value of the midspan influence reaches 259.6mm, the influence on other lines is also obvious, and the influence on the track at the farthest end of the passenger train line also reaches 209.8 mm.
By calculation, by adopting the method, the constant loads of the line except the track and the fixed member thereof are all constructed, and the weight of the laid track in the later period is smaller, so that the maximum value of the influence quantity of the reserved passenger train line laying track on the linearity of the passenger train line track is only 28.2mm, the influence quantity of the reserved passenger train line laying track on the track at the farthest end of the passenger train line is only 22.8mm, and the influence quantity is greatly smaller than the calculation result of the traditional laying mode.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (5)
1. A track linear control method for a multi-wire cable-stayed railway bridge is characterized by comprising the following steps:
the method comprises the following steps:
a: determining a railway line construction sequence: determining the construction period of each railway line of the multi-line railway;
b: building a foundation: building a beam body and a bridge deck of the cable-stayed railway bridge, installing a stay cable, paving a track bed on the bridge deck, and then arranging sleepers on the track bed, wherein the track bed in the step is the track bed of all railway lines, and the sleepers in the step are the sleepers of all railway lines;
c: and (3) accessory construction: arranging other accessories, except for the rail and the member for fixing the rail, at the design position, wherein the accessories are constant-load parts positioned on the foundation in the railway line;
c1: adjusting the linear shape of the beam body: after the step C is finished, detecting the line shape of the beam body, and then adjusting the stay cables to ensure that the line shape precision of the beam body meets the design requirement;
d: track laying: and B, paving the rails of the corresponding railway line according to the railway line construction period determined in the step A, and setting pre-camber for the previously paved rails when paving the rails, wherein the direction of the pre-camber is opposite to the direction of the linear influence of the subsequently paved rails on the rails.
2. The trajectory alignment control method according to claim 1, characterized in that:
the step A comprises the following steps:
a1: modeling and analyzing the linear influence degree of the later laying track on the earlier laying track: establishing a corresponding model, designing different railway line construction sequences, and analyzing the influence degree of a later laid railway line on the track alignment of a previously laid railway line in various railway line construction sequences;
a2: determining a construction sequence: and B, sequencing the iron routes from top to bottom according to the influence degree of each iron route determined in the step A1 to obtain the laying sequence of each iron route.
3. The trajectory alignment control method according to claim 2, characterized in that:
step E is also provided after step D: a step of detecting the line shape of the track,
the step E is as follows: after the track is laid, detecting the overall linear shape of the track, and when the track linear shape detection in the step E is unqualified, further setting a step F after the step E: and F, adjusting the track twice, namely adjusting the track through the step F until the linear shape meets the linear requirement of the track of the high-speed railway.
4. The trajectory alignment control method according to claim 3, characterized in that:
and F, adjusting the tensioning degree of the inhaul cable at the corresponding position at the track linear sudden change position, and further realizing the adjustment of the track linear shape.
5. The trajectory alignment control method according to claim 4, wherein:
and D, setting the pre-camber, wherein the height of the pre-camber is the same as the height of the linear influence of the post-laid track on the track.
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| CN103882812A (en) * | 2014-04-03 | 2014-06-25 | 重庆建工桥梁工程有限责任公司 | Construction method for midspan main beams of cable-stayed bridge |
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