CN215366842U - Horizontal rotation bridge tension and compression temporary locking structure - Google Patents
Horizontal rotation bridge tension and compression temporary locking structure Download PDFInfo
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- CN215366842U CN215366842U CN202120571704.XU CN202120571704U CN215366842U CN 215366842 U CN215366842 U CN 215366842U CN 202120571704 U CN202120571704 U CN 202120571704U CN 215366842 U CN215366842 U CN 215366842U
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Abstract
The utility model relates to a tension-compression temporary locking structure of a horizontal rotation bridge, which comprises temporary locking section steel, a spherical hinge, a lower rotary table, an upper rotary table, a bearing platform, a pier body and supporting feet, wherein the pier body and the bearing platform are integrally cast, the upper rotary table and the bearing platform are integrally cast, the supporting feet are embedded under the upper rotary table, the spherical hinge is arranged at the bottom of the upper rotary table, the upper rotary table and the lower rotary table are hinged through the spherical hinge, and the temporary locking section steel is arranged between the lower rotary table and the upper rotary table. The utility model can avoid the complex labor of dismantling the sand barrel and the cleaning work of the slide way and the spherical hinge before the rotation of the flat-turning bridge, has less steel consumption than the traditional sand barrel and high construction speed, and can reversely calculate the unbalanced moment according to the stress change before and after temporary locking and cutting off to balance the weight, thereby saving the special weighing link before the rotation which is necessary to be carried out by the conventional sand barrel as the temporary support design.
Description
Technical Field
The utility model relates to the technical field of bridge design and construction, in particular to a tension-compression temporary locking structure of a horizontal rotation bridge.
Background
At present, with the vigorous construction of national infrastructure, the construction of high-speed railways and highways is developed vigorously, because a newly-built road network and an original road network have a crossing condition, a mode of crossing an existing line on a new line is mostly adopted when the newly-built road network and the original road network cross, in order to not influence the operation of the existing line, bridge construction at the crossing position of the newly-built line and the existing line mostly adopts movable hanging basket cantilever pouring or a rotating construction mode, the rotating construction method has a flat rotating method and a vertical rotating method according to construction conditions and site environment, the flat rotating method is mostly adopted, and a flat rotating system mainly comprises a bearing system, a pushing traction system and a balance system. The bearing system is composed of an upper rotary table, a lower rotary table and a rotary spherical hinge, wherein the lower rotary table is used as a basis for supporting the whole weight of the rotating structure, the upper rotary table is a longitudinal-transverse bidirectional system and is an important structure of the rotating structure, the rotary spherical hinge is arranged between the upper rotary table and the lower rotary table, the upper rotary table rotates relative to the lower rotary table through the spherical hinge to achieve the purpose of rotating, and after the rotating is completed, the upper rotary table and the lower rotary table are poured and then packaged with concrete, so that the upper rotary table and the lower rotary table are integrally stressed together.
The swivel construction is a work with great technical difficulty and high safety risk, serious consequences can be caused by carelessness, the requirements on the composition and the installation construction of a swivel spherical hinge system are extremely high, a set of detailed and mature construction process flow is required, and each process of the installation construction is well controlled so as to ensure the quality of the swivel construction. At present, the lower bearing platform (lower rotary table) system concrete for swivel construction by a down-swivel method mainly adopts a construction process of firstly pouring bottom concrete and peripheral concrete, reserving an installation foundation pit, carrying out spherical hinge installation construction in the installation foundation pit, and then pouring and installing the foundation pit concrete; some construction processes are divided into slideway concrete and spherical hinge bottom concrete when pouring and installing foundation pit concrete, and finally pouring concrete of bearing platforms between the slideway and the periphery and between the slideway and the spherical hinge.
In order to balance the unbalanced load in the construction of the horizontal rotation bridge, a sand bucket is usually arranged at the position of the slide way to serve as a temporary stable supporting structure, as shown in fig. 2; however, in such a scheme, after the construction of the swivel structure is finished, before unbalanced weighing, the temporary stable support sand barrel needs to be dismantled, the dismantling of the sand barrel is high in construction labor intensity and low in construction speed, sand drawn out of the sand barrel in the dismantling process is prone to polluting a slide way and a ball hinge, the cleaning is time-consuming and labor-consuming, before formal swivel, the site construction is often time-intensive and heavy in task, and the dismantling of the sand barrel and the cleaning of the slide way and the ball hinge add considerable time cost and uncertain factors to the project, so that improvement is needed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical defects in the prior art, the utility model provides a tension-compression temporary locking structure for a horizontal rotation bridge, which can effectively solve the problems in the background art.
In order to solve the technical problems, the technical scheme of the tension-compression temporary locking structure of the horizontal rotation bridge provided by the utility model is as follows:
the embodiment of the utility model discloses a tension and compression temporary locking structure of a horizontal rotation bridge, which comprises temporary locking section steel, a spherical hinge, a lower rotary table, an upper rotary table, a bearing platform, a pier body and supporting legs, wherein the pier body and the bearing platform are integrally cast, the upper rotary table and the bearing platform are integrally cast, the supporting legs are embedded under the upper rotary table, the spherical hinge is arranged at the bottom of the upper rotary table, the upper rotary table and the lower rotary table are hinged through the spherical hinge, and the temporary locking section steel is positioned between the lower rotary table and the upper rotary table.
In any of the above schemes, preferably, the temporary locking section steel is pre-buried before concrete of the lower rotary table and the upper rotary table is poured.
In any of the above schemes, preferably, four temporary locking section steels are arranged between the lower rotary table and the upper rotary table.
In any of the above schemes, preferably, eight of the braces are embedded on the upper rotary disc and the lower rotary disc, and each brace is a concrete filled steel tube cylindrical structure.
In any one of the above aspects, preferably, the temporary locking section steel is provided with a strain sensor.
In any one of the above aspects, preferably, the strain sensor may measure a change in strain before and after the temporary locking section steel is cut.
Compared with the prior art, the utility model has the beneficial effects that:
the conventional sand bucket is cancelled as a temporary stable supporting structure, 4 rigid temporary locking section steels are arranged, so that the sand bucket can resist pressure and can resist tension, the asymmetric load and the unpredictable horizontal load during the construction of a swivel structure can be balanced, and the complex labor of dismantling the sand bucket and the work of cleaning the spherical hinge and the slide way can be avoided before the swivel; the steel amount of the temporary locking section steel is less than that of the traditional sand barrel, and the construction speed is high; meanwhile, the unbalanced moment can be reversely calculated according to the stress change before and after the temporary locking section steel is cut off, so that the balance weight is balanced, and a special pre-transfer weighing link which is required to be carried out by the conventional sand bucket as a temporary support design is omitted.
Drawings
The drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification.
FIG. 1a is a side view of the present invention at the front ball joint position of a bridge swivel;
FIG. 1b is an elevation view of the present invention in the position of the ball joint at the front of the bridge swivel;
FIG. 1c is a plan view of the present invention in a position at the front ball joint of the bridge swivel;
FIG. 2 is a plan view of components at a spherical hinge position of a conventional level-rotating bridge;
FIG. 3 is a schematic view of the overall stress of the structure before temporary locking and cutting of the bridge of the present invention;
FIG. 4 is a schematic view of the overall stress of the structure after temporary locking and cutting of the bridge of the present invention.
The reference numbers in the figures illustrate:
1. temporarily locking the section steel; 2. spherical hinge; 3. a lower turntable; 4. an upper turntable; 5. a bearing platform; 6. a pier body; 7. a brace; 8. a sand bucket; 9. a strain sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
For better understanding of the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the drawings and the detailed description of the present invention.
As shown in fig. 1a and fig. 1c, a horizontal rotation bridge draws and presses interim locking structure includes interim locking shaped steel 1, spherical hinge 2, lower carousel 3, last carousel 4, cushion cap 5, pier shaft 6, spike 7, pier shaft 6 with cushion cap 5 integrative pouring shaping, go up carousel 4 with cushion cap 5 monolithic pouring shaping, it has inlayed under the carousel 4 to go up the carousel the spike 7, it is equipped with to go up 4 lower extremes of carousel the spherical hinge 2, go up carousel 4 with lower carousel 3 passes through spherical hinge 2 is articulated, lower carousel 3 with be equipped with four between last carousel 4 interim locking shaped steel 1.
Further, as shown in fig. 1b, the temporary locking section steel 1 is pre-embedded in the lower rotary table 3 and the upper rotary table 4 before concrete pouring, after the concrete pouring, the temporary locking section steel 1 can be formed rigidly between the upper rotary table 4 and the lower rotary table 3, and the temporary locking section steel 1 is used for balancing asymmetric load and unpredictable horizontal load during the construction of the swivel structure, so that the effects of compression resistance and tension resistance can be achieved.
Further, when the spherical hinge 2 framework is installed, the relative height difference of the top surface of the framework is required to be not more than 1mm, the center of the framework is overlapped with the center of the spherical hinge 2, and the deviation from the theoretical center is not more than 2 mm; and (3) installing the spherical hinge 2 framework when the first-step concrete of the foundation reaches the strength, adopting a method of welding and transporting the spherical hinge 2 framework to a field for installation in a factory, placing the spherical hinge 2 framework in the center of the foundation, controlling the position of the spherical hinge 2 framework by using a cross wire, and adopting precision leveling for elevation control.
Furthermore, the supporting feet 7 are safety legs which support the stable rotation structure when rotating, and can bear the unbalanced force in the rotation process so as to keep the stable rotation structure, the upper rotating disc 4 is provided with 8 supporting feet 7, and each supporting foot 7 is of a steel pipe concrete cylindrical structure.
Further, because the upper rotating disc 4 is the important structure of turning, forms a multidirectional, three-dimensional stress state at the whole in-process of turning, promptly the upper rotating disc 4 should cloth have vertical, horizontal two-way prestressing steel, the construction of upper rotating disc 4 adopts design steel mould, and the formula scaffold frame is detained to the bowl supports, and it is right to vertically adopt the fine bundle twisted steel during the construction the upper rotating disc 4 with carousel 3 carries out the interim consolidation down, treats after the concrete of upper rotating disc 4 reaches design intensity, carries out the conversion of entire system supporting system again.
As shown in fig. 3, when the temporary locking section steel 1 balances the asymmetric load and the unpredictable horizontal load during the construction process of the upper structure of the horizontal rotation bridge, the weight of the rotation structure is mainly born by the spherical hinge 2.
As shown in fig. 1a and 4, after the construction of the swivel structure is completed, before the swivel, the temporary locking section steel 1 is provided with a strain sensor 9, and the strain sensor 9 can measure the strain change before and after the temporary locking section steel 1 is cut, so that the unbalance moment can be inversely calculated according to the stress change before and after the temporary locking section steel 1 is cut and the tension and compression stiffness of the temporary locking section steel 1, and the balance weight can be performed.
In a preferred real-time mode, in the construction process of a main structure of a flat-turning bridge, the unbalance load of a turning structure is calculated according to 2% of the construction weight deviation of a cantilever beam at one side, and meanwhile, the unbalance moment caused by environmental wind load and the unbalance moment caused by other large-scale construction machinery are considered, and the design value R of the tension and compression temporary locking bearing capacity is obtained as follows:
r-tension-compression temporary locking structural steel bearing capacity design value, kN;
Mgconstructing a maximum unbalanced moment kN.m by using a cantilever at one side;
Ls-distance between temporary locking centers on both sides, m;
Wz-total weight of flatwise-rotating bridge box girder, kN;
Lx-maximum cantilever length, m, of one side of the level-turn bridge;
Mf-the unbalanced moment of the pneumatic vertical force of the ambient wind on the spherical hinge, kn.m;
Mqunbalanced moment of ball joints, kn.m, of other large construction machines (such as a cradle);
after the construction of the main structure of the horizontal rotation bridge is completed, assuming that the small mileage is heavy, the whole stress condition of the full bridge is as shown in fig. 3, and the balance relationship is as follows:
My+Mz0＝MG0
MG0＝N0×e0
My＝P1·Lx+P2·Ld
My-the support moment, kn.m, provided by said temporary locking section steel 1;
MZ0moment, kN.m, provided by the static friction force of the spherical hinge before the temporary locking section steel 1 is cut;
MGO-unbalanced moment before leveling the bridge counterweight, kn.m;
N0-weight before flatting the bridge counterweight, kN;
e0the vertical bridge direction eccentricity m before the balance weight of the flat turning bridge;
P1-the support force, kN, provided by the temporary locking of the small range side;
P2-the support force, kN, provided by the macro side temporary lock;
Lxthe small range side temporary lock is at the horizontal distance from the center of the ball joint,m；
Ld-the horizontal distance, m, from the centre of the ball joint to the side of the greater mileage;
friction moment M provided by spherical hingeZ0At 0 to maximum static friction moment MzmaxNamely:
0≤Mz0≤Mzmax
before the formal rotation, the temporary locking is cut off, the stress change of the temporary locking section steel 1 before and after cutting is measured, the supporting force provided before the cutting is calculated, and the balance moment M provided before the cutting of the temporary locking section steel 1 is further worked outy。
Calculating the maximum static friction moment according to the friction coefficient reference value provided by the spherical hinge manufacturer, and taking the maximum friction moment MzmaxAnd temporary locking of the provided support moment MyAnd (6) carrying out counterweight. Namely:
the whole stress situation of the full bridge is shown in fig. 4 after the counterweight, and the full bridge unbalanced moment is as follows:
full-bridge weight after counter weight:
N＝N0+Nfitting for mixing
Full-bridge offset after counterweight:
Mzmax＝μ·N0·R
mu-coefficient of static friction of spherical hinge, generally less than 0.02;
r-radius of curvature of spherical hinge, generally less than 1000 cm;
the calculation of the longitudinal bridge direction is taken as an example, and the transverse bridge direction is the same.
In summary, the eccentricity of the rear structure of the counterweight satisfies
The requirements of (1).
Compared with the prior art, the tension and compression temporary locking structure of the horizontal rotation bridge has the following beneficial effects: the conventional sand bucket 8 is cancelled as a temporary stable supporting structure, 4 rigid temporary locking section steels 1 are arranged, and the temporary locking section steels can resist pressure and tension and are used for balancing asymmetric load and unpredictable horizontal load during the construction of a swivel structure, so that the complex labor of dismantling the sand bucket 8 and the work of cleaning the spherical hinge 2 and a slide way can be avoided before swivel; the steel consumption of the temporary locking section steel 1 is less than that of the traditional sand barrel 8, and the construction speed is high; meanwhile, the unbalanced moment can be reversely calculated according to the stress change before and after the temporary locking section steel 1 is cut off, and balance weight is carried out, so that a special weighing link before transferring which is required to be carried out by using the conventional sand barrel 8 as a temporary support design is omitted.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the utility model as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a horizontal rotation bridge draws and presses interim locking structure which characterized in that: including interim locking shaped steel (1), lower carousel (3), go up carousel (4), cushion cap (5), pier shaft (6) and arm-brace (7), pier shaft (6) with cushion cap (5) integrated into one piece is pour the shaping, go up carousel (4) and inlay down arm-brace (7), it is equipped with ball pivot (2) to go up carousel (4) bottom, go up carousel (4) with lower carousel (3) passes through ball pivot (2) are articulated, interim locking shaped steel (1) is located lower carousel (3) with go up between carousel (4).
2. The tension and compression temporary locking structure for a flat-turning bridge according to claim 1, wherein: the temporary locking section steel (1) is pre-buried before concrete of the lower rotary table (3) and the upper rotary table (4) is poured.
3. The tension and compression temporary locking structure for a flat-turning bridge according to claim 2, wherein: four temporary locking section steels (1) are arranged between the lower rotary table (3) and the upper rotary table (4).
4. The tension and compression temporary locking structure for a flat-turning bridge according to claim 3, wherein: eight arm braces (7) are embedded from top to bottom in last carousel (4), every arm brace (7) are steel pipe concrete cylindrical structure.
5. The tension and compression temporary locking structure for a flat-turning bridge according to claim 4, wherein: and a strain sensor (9) is arranged on the temporary locking section steel (1).
6. The tension and compression temporary locking structure for a flat-turning bridge according to claim 5, wherein: the strain sensor (9) can measure the change in strain before and after the temporary locking section steel (1) is cut.
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| CN113089486A (en) * | 2021-03-19 | 2021-07-09 | 北京工业大学 | Horizontal rotation bridge tension and compression temporary locking structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113089486A (en) * | 2021-03-19 | 2021-07-09 | 北京工业大学 | Horizontal rotation bridge tension and compression temporary locking structure |
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