CN113356084A - Turning curve bridge structure and curve bridge eccentric turning construction method - Google Patents
Turning curve bridge structure and curve bridge eccentric turning construction method Download PDFInfo
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- CN113356084A CN113356084A CN202110634650.1A CN202110634650A CN113356084A CN 113356084 A CN113356084 A CN 113356084A CN 202110634650 A CN202110634650 A CN 202110634650A CN 113356084 A CN113356084 A CN 113356084A
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Abstract
The invention discloses a turning curved bridge structure and a curved bridge eccentric turning construction method, which comprise a bridge pier, wherein a curved beam body is arranged at the top end of the bridge pier, a rotary bearing platform is arranged at the bottom end of the bridge pier and comprises an upper bearing platform, a lower bearing platform and a spherical hinge structure, the upper bearing platform is rotatably arranged on the lower bearing platform through the spherical hinge structure, a plurality of auxiliary supporting feet and a driving supporting foot are arranged at the bottom of the upper bearing platform, the auxiliary supporting feet and the driving supporting feet are uniformly distributed at the bottom of the upper bearing platform in an annular mode, the driving supporting feet are positioned on the inner arc side of the transverse axis of the curved beam body, and each driving supporting foot comprises a pressure sensor arranged at the bottom of the upper bearing platform and a sliding block connected to the bottom of the pressure sensor. The pressure-measurable sliding block is used as a driving supporting leg and can be used for swivel construction of a curved bridge with large transverse eccentricity. The rotor of the curved bridge is prevented from being in an unstable state supported only by the spherical hinge when rotating, the stability of the rotor in the rotating process is improved, and the rotating process is more controllable, high in construction precision and better in stability.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a curved bridge structure for swivel construction and an eccentric swivel construction method of a curved bridge adapted to be used.
Background
With the development of three-dimensional comprehensive traffic, bridges spanning existing traffic lines, particularly existing railways and light rails, are increasing day by day. In order to avoid the influence of construction on the operation of the existing line, the application of swivel construction in bridge construction is increasing day by day. Many bridges have complex construction areas, and the bridge axis is often a flat curve with a large curvature. The swivel construction method is a construction method that firstly, a bridge girder is manufactured on a line position which does not influence the operation of the existing line by taking a pier as a center, and then the bridge girder is rotated to a preset bridge axis in the operation skylight period of the existing line. The rotating body has a simple structure, the manufacturing process is not influenced by the existing traffic, the rotating process time is short, and the operation is simple.
In a common linear bridge, swivel construction generally theoretically uses the center of a pier as a rotating shaft to rotate, and the center of gravity of the whole rotating body is required to coincide with the center of the rotating shaft. The curve bridge usually achieves theoretical coincidence through preset eccentricity, but in actual construction, due to the existence of construction errors, the straight bridge generally generates eccentricity in the longitudinal bridge direction, a balance weight needs to be determined through a weighing test, and the curve bridge may generate eccentricity in both the longitudinal bridge direction and the transverse bridge direction. The counterweight at the cantilever end of the longitudinal bridge of the curved bridge can also influence the eccentricity of the transverse bridge of the curved bridge, and the counterweight is difficult to be arranged when the width of the transverse bridge of the curved bridge is small, so that the situation is more prominent when the curvature radius is smaller.
In the related art, when a curve bridge is rotated for construction, the bottom of a bridge pier is only rotatably supported through the spherical hinge turnplates, and the problem that the overall attitude of the bridge is unstable easily due to the fact that the friction force between the spherical hinge parts matched with the upper turnplates and the lower turnplates is small and the curve bridge has bidirectional eccentricity is solved.
Disclosure of Invention
The invention aims to solve one of the technical problems in the related technology to a certain extent, and provides an improved curved bridge structure and a corresponding curved bridge turning construction method, so as to solve the problems that the overall attitude of the curved bridge is not easy to control and is unstable during turning construction.
Therefore, one objective of the present invention is to provide a curved bridge structure, which includes a bridge pier, a curved beam body is disposed at the top end of the bridge pier, a rotary bearing platform is disposed at the bottom end of the bridge pier, the rotary bearing platform includes an upper bearing platform, a lower bearing platform and a spherical hinge structure, the upper bearing platform is rotatably disposed on the lower bearing platform through the spherical hinge structure, a plurality of auxiliary supporting legs and a driving supporting leg are disposed at the bottom of the upper bearing platform, the auxiliary supporting legs and the driving supporting legs are uniformly distributed at the bottom of the upper bearing platform in an annular manner, the driving supporting legs are located on the inner arc side of the transverse axis of the curved beam body, and the driving supporting legs include a pressure sensor disposed at the bottom of the upper bearing platform and a slider connected to the bottom of the pressure sensor.
Preferably, the lower bearing platform is provided with an annular slideway for the auxiliary supporting leg and the active supporting leg to slide.
Preferably, the annular slideway is provided with a pair of wedge blocks for pre-clamping the driving supporting feet.
Preferably, the bottom end of the sliding block is embedded with a polytetrafluoroethylene block.
Preferably, the auxiliary supporting legs are seven, and the seven auxiliary supporting legs and the one driving supporting leg are annularly distributed at equal intervals at the bottom of the upper bearing platform.
The invention also aims to provide a curved bridge swivel construction method, which comprises the following steps:
s1: presetting an eccentricity according to the curve radius of the curve bridge; the curve bridge comprises a rotating bearing platform and a rotating body arranged on the rotating bearing platform, and the eccentricity is the distance of the gravity center of the rotating body deviating from the center of a spherical hinge on the rotating bearing platform;
s2: installing a rotary bearing platform and a rotary body according to a preset eccentricity parameter; the rotary bearing platform comprises an upper bearing platform, a lower bearing platform and a spherical hinge structure arranged between the upper bearing platform and the lower bearing platform, and the rotary body comprises a curved beam body and a pier;
s3: a plurality of auxiliary supporting legs and an active supporting leg are embedded at the bottom of the upper bearing platform; the auxiliary supporting legs and the active supporting legs are uniformly distributed in an annular shape, the active supporting legs are positioned on the inner arc side of the transverse axis of the curved beam body, and each active supporting leg comprises a pressure sensor and a sliding block which are connected;
s4: and the traction curve bridge and the bridge pier rotate to the target position around the spherical hinge structure.
Preferably, in step S2, when the rotary support platform is installed, an annular slide rail on which the auxiliary support leg and the active support leg slide is installed on the lower support platform.
Preferably, in step S2, seven auxiliary supporting legs and one active supporting leg are embedded in the bottom of the upper bearing platform, and the seven auxiliary supporting legs and the one active supporting leg are annularly distributed at equal intervals at the bottom of the upper bearing platform.
Preferably, before the swivel operation is performed in step S4, the method further includes the following preparation steps:
cleaning an annular slideway, respectively supporting two sides of three auxiliary supporting feet positioned on the longitudinal axis and the transverse axis of a curved bridge with a jack, vertically placing a dial indicator at the bottom of each auxiliary supporting foot, and arranging a wedge block on the annular slideway to clamp a sliding block of a driving supporting foot;
under the protection action of the jack, gradually releasing the temporary locking device of the rotor, measuring and reading the rotation condition of the rotor in real time through a dial indicator, and measuring and reading the supporting force of the driving supporting leg at the inward arc side of the transverse bridge in real time through a pressure sensor;
removing the wedge block beside the sliding block, enabling the rotor to carry out a weighing experiment by using a jack beside the auxiliary supporting leg on the longitudinal axis of the curved beam body under the common support of the spherical hinge structure and the driving supporting leg, measuring the friction coefficient at the spherical hinge, basically separating the auxiliary supporting leg from the annular slideway through the balance weight at the cantilever end of the curved beam body, and measuring and reading the supporting force at the pressure sensor in real time;
and (3) paving a polytetrafluoroethylene block on the annular slide way below the driving supporting leg, and removing all the jacks to enable the rotor to be in a preparation state before the rotor rotates.
Preferably, when the dial indicator is used for measuring that the rotating body rotates towards one side along the bridge, the fact that the rotating body is heavier towards one side along the bridge is indicated; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, a proper counterweight is arranged at the cantilever end of the curved bridge to increase the supporting force; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, the outer arc side of the curve bridge at the top of the bridge pier is properly weighted to reduce the supporting force.
The technical scheme has the following advantages or beneficial effects:
1. in the curved bridge structure, a pressure-measurable sliding block with a sensor is designed at the bottom of an upper bearing platform and is used as a driving supporting leg, the pressure-measurable sliding block is supported on an annular slide way of a lower bearing platform, and the construction of a curved bridge with large transverse eccentricity and supporting legs for supporting a rotating body can be actively controlled. The rotor of the curved bridge is prevented from being in an unstable state supported only by the spherical hinge when rotating, the stability of the rotor in the rotating process is improved, and the rotating process is more controllable, high in construction precision and better in stability.
2. The supporting leg with the pressure sensor and the sliding block is arranged on the inner arc side of the curved bridge, and the pressure sensor and the sliding block are installed before the temporary locking of the rotating body is released and are fixed through the wedge-shaped block. When the temporary locking is removed, the rotating body is stable in the transverse bridge direction of the curve bridge, unbalanced eccentric moment in the transverse bridge direction can be directly obtained through the pressure sensor, only the unbalanced weighing in the longitudinal bridge direction of the curve bridge needs to be carried out, and the problem that the bidirectional unbalanced weighing needs to be solved by the curve bridge is changed. The method changes the situation that the rotor needs to be accurately adjusted in the longitudinal and transverse directions after the rotation is finished into the situation that the rotor only needs to be accurately adjusted in the longitudinal and bridge directions, simplifies the construction process, increases the construction safety, improves the construction efficiency, and effectively reduces the safety risk of cross-line regional operation.
3. The curve bridge has torque towards the inner arc side of the bridge in a rotating state, and the larger the curvature radius is, the larger the torque is. In order to make the center of the swivel coincide with the center of the spherical hinge, the center of the spherical hinge needs to be moved inwards in the prior art. And this application allows to turn and keeps certain moment of turning to the inboard, just can reduce the amount of movement of the inward arc side of ball pivot center, has effectively reduced pier and cushion cap volume.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a swivel curvilinear bridge configuration of the present invention;
FIG. 2 is a schematic structural view of the upper deck of the present invention;
fig. 3 is a schematic structural view of the lower deck of the present invention.
The device comprises a bridge pier, a curved beam body, an upper bearing platform, a lower bearing platform, an auxiliary supporting foot, a driving supporting foot, a pressure sensor, a sliding block, a ring-shaped slideway, a wedge-shaped block, a prestressed traction rope and a connecting rod, wherein the bridge pier comprises 1, 2, a curved beam body, 3, an upper bearing platform, 4, a lower bearing platform, 5, the auxiliary supporting foot, 6, the driving supporting foot, 6a, the pressure sensor, 6b, the sliding block, 7, the ring-shaped slideway, 8, the wedge-shaped block, 9 and the prestressed traction rope.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The first embodiment is as follows:
as shown in fig. 1 to 3, the present invention discloses a turning curved bridge structure, which includes a bridge pier 1, a curved beam body 2 is disposed at the top end of the bridge pier 1, a rotary bearing platform is disposed at the bottom end of the bridge pier 1, and the rotary bearing platform includes an upper bearing platform 3, a lower bearing platform 4 and a spherical hinge structure. The upper bearing platform 3 is rotatably arranged on the lower bearing platform 4 through a spherical hinge structure, the bottom of the upper bearing platform 3 is provided with a plurality of auxiliary supporting feet 5 and a plurality of driving supporting feet 6, the auxiliary supporting feet 5 and the driving supporting feet 6 are annularly and uniformly distributed at the bottom of the upper bearing platform 3, the driving supporting feet 6 are positioned on the inner arc side of the transverse axis of the curved beam body 2, and the driving supporting feet 6 comprise a pressure sensor 6a arranged at the bottom of the upper bearing platform 3 and a sliding block 6b connected to the bottom of the pressure sensor 6 a. Wherein, supplementary supporting legs 5 can be for pressing close to a pair of steel core concrete column that sets up each other during actual construction, prevent overtum equipment when as curve bridge rotor rotation. A pair of prestressed traction ropes 9 is fixed on the outer wall of the upper bearing platform.
Preferably, the lower bearing platform 4 is provided with an annular slideway 7 for limiting the stable sliding of the auxiliary supporting feet 5 and the active supporting feet 6.
Preferably, the annular slideway 7 is provided with a pair of wedge blocks 8 for pre-clamping the driving supporting feet 6, and is used for controlling the rotor to be stable in the transverse bridge direction before the rotor.
Preferably, the bottom end of the sliding block 6b is embedded with a teflon block, which has a low friction coefficient and enables the sliding block 6b to freely slide on the surface of the annular slideway 7.
Preferably, the auxiliary supporting feet 5 are provided with seven, and the seven auxiliary supporting feet 5 and one active supporting foot 6 are distributed at the bottom of the upper bearing platform 3 at equal intervals in a ring shape.
Preferably, the joint of the top end of the pier 1 and the curved beam body 2 is as wide as the bottom surface of the curved beam body 2, the vertical surface of the pier 1 on the outer arc side of the curve is a vertical surface, and the vertical surface on the inner arc side is inclined. The center of the bottom surface of the pier 1 coincides with the center of a spherical hinge on a rotary bearing platform, and a certain eccentric distance is reserved between the center of gravity of the rotary body and the center of gravity of the rotary body, so that the center of gravity of the rotary body is more deviated to the inner arc side than the center of the spherical hinge. The purpose of adjusting the eccentricity of the curved bridge rotating body is achieved by utilizing the change of the upper narrow section and the lower wide section.
Example two:
the eccentric rotation construction method of the curve bridge comprises the following steps:
s1: presetting an eccentricity according to the curve radius of the curve bridge; the curve bridge comprises a rotary bearing platform and a rotary body arranged on the rotary bearing platform, and the eccentricity is the distance of the gravity center of the rotary body deviating from the center of a spherical hinge on the rotary bearing platform; on the principle that the traction force is increased by not more than 1.5 times of the traction force when the supporting feet are not supported theoretically, the proper preset eccentricity that the gravity center of the rotating body deviates to the outer side of the gravity center of the rotating disc is determined, so that the weight of the rotating body generates the preset moment rotating towards the direction of the inner arc side of the curve.
S2: installing a rotary bearing platform and a rotary body according to a preset eccentricity parameter; the rotary bearing platform comprises an upper bearing platform, a lower bearing platform and a spherical hinge structure arranged between the upper bearing platform and the lower bearing platform, and the rotator comprises a curved beam body and a pier;
s3: a plurality of auxiliary supporting legs and an active supporting leg are embedded at the bottom of the upper bearing platform; the auxiliary supporting legs and the active supporting legs are uniformly distributed in an annular shape, the active supporting legs are positioned on the inner arc side of the transverse axis of the curved beam body, and each active supporting leg comprises a pressure sensor and a sliding block which are connected;
s4: and the traction curve bridge and the bridge pier rotate to the target position around the spherical hinge structure.
Preferably, in step S2, when the rotary support platform is installed, an annular slide rail on which the auxiliary support leg and the active support leg slide is installed on the lower support platform. The annular slide is required to be smooth and is coated with lubricating oil when rotating.
Preferably, in step S2, seven auxiliary supporting legs and one active supporting leg are embedded in the bottom of the upper bearing platform, and the seven auxiliary supporting legs and the one active supporting leg are annularly distributed at equal intervals at the bottom of the upper bearing platform.
Preferably, before the swivel operation is performed in step S4, the method further includes the following preparation steps:
cleaning an annular slideway, respectively supporting two sides of three auxiliary supporting feet positioned on the longitudinal axis and the transverse axis of the curved bridge with a jack, vertically placing a dial indicator at the bottom of each auxiliary supporting foot, and arranging a wedge block on the annular slideway to clamp a sliding block of the driving supporting foot;
under the protection of the jack, gradually releasing the temporary locking device of the rotor, measuring and reading the rotation condition of the rotor in real time through a dial indicator, and measuring and reading the supporting force of the driving supporting leg at the inward arc side of the transverse bridge in real time through a pressure sensor;
removing the wedge block beside the sliding block, enabling the rotor to carry out a weighing experiment by using a jack beside the auxiliary supporting leg on the longitudinal axis of the curved beam body under the common support of the spherical hinge structure and the driving supporting leg, measuring the friction coefficient at the spherical hinge, basically separating the auxiliary supporting leg from the annular slideway through the balance weight at the cantilever end of the curved beam body, and measuring and reading the supporting force at the pressure sensor in real time;
and (3) paving a polytetrafluoroethylene block on the annular slide way below the driving supporting leg, and removing all the jacks to enable the rotor to be in a preparation state before the rotor rotates.
Preferably, when the rotator rotates towards one side of the forward bridge, which is measured by the dial indicator, the rotator is heavier towards one side of the forward bridge; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, a proper counterweight is arranged at the cantilever end of the curved bridge to increase the supporting force; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, the outer arc side of the curve bridge at the top of the pier is properly weighted to reduce the supporting force.
The following discloses a turning construction example of a curved bridge:
a1: the curve bridge is a curve T with the curve radius of 350m and the cantilever length of 50m at one side forms a rotor, the total weight W of the rotor is 77000kN, the rotating traction force F is calculated by the following formula,
wherein, R is the spherical hinge plane radius, R is 1.5m, the spherical hinge static friction coefficient is 0.1 μ during starting, the spherical hinge dynamic friction coefficient is 0.06 μ during rotation, D is the turntable diameter (i.e. the traction coupling arm), D is 12m, and F is 642kN during starting and F is 385kN during rotation;
a2: the traction force is increased by 50 percent when the supporting leg rotates according to the supporting force of the active support, and the coefficient of dynamic friction between the annular slideway and the sliding block is mu1Calculated as 0.05, the temple support force N is F/mu1＝385/0.05＝7700kN；
A3: referring to fig. 1, when the supporting force N of the supporting leg of the active support is 7700kN, the center of the spherical hinge deviates from the center of gravity e of the rotor by 0.15 m;
a4: referring to fig. 2 and 3, according to the eccentric value of the center of the spherical hinge deviating from the gravity center of the rotating body, completing the installation of the spherical hinge and the construction of an upper bearing platform and a lower bearing platform, completing the construction of a slideway, an auxiliary supporting leg and an active supporting leg, filling a sand cylinder between the upper bearing platform and the lower bearing platform, arranging temporary prestressed steel bars to connect the upper bearing platform and the lower bearing platform for temporary locking, and filling dry sand when the distance between the bottom of a common supporting leg and the slideway is 2 cm;
a5: constructing a pier and a beam body to form a rotating body;
a6: cleaning a slide way, respectively placing 1 jack on two sides of 3 auxiliary supporting feet at the longitudinal and transverse axis positions of a bridge rotator, vertically arranging 1 dial indicator on each common supporting foot, installing a pressure sensor and a sliding block below an active supporting foot, and wedging the sliding block by a wedge block;
a7: under the protection of a jack, a temporary locking device (a sand cylinder and a temporary locking prestressed steel bar) of a bridge rotor is gradually released, the rotation condition of the rotor is measured and read through a dial indicator, and the supporting force of the active supporting arm of the inward arc side of the transverse bridge is measured and read through a pressure sensor.
A8: the rotation of one side of the forward bridge is measured by a dial indicator, which shows that the rotor is unbalanced to the side along the bridge;
a9: because the pre-eccentricity 15cm towards the inward arc side of the transverse bridge is initially set, the pressure sensor can measure the supporting force in general, if the supporting force is smaller than a design value N which is 7700kN, the supporting force needs to be increased through a proper counterweight at the cantilever end, and if the supporting force is too large, the supporting force needs to be reduced through a proper counterweight at the top outer arc side of the bridge pier or the outer arc side of the bridge pier;
a10: and removing the wedge block below the sliding block, so that the curve bridge rotator is supported by the spherical hinge and the driving supporting leg together, performing a conventional weighing test by using a jack beside the auxiliary supporting leg on the longitudinal axis, measuring serial parameters such as friction coefficient and the like, basically separating the auxiliary supporting leg from the slide way by using the balance weight at the cantilever end, and monitoring the supporting force of the pressure sensor.
A11: and operating a pair of prestressed traction ropes on the outer wall of the upper bearing platform to enable the rotator to rotate to a target position.
It should be noted that, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not 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.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. 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 the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (10)
1. The utility model provides a turning curved bridge structure, includes pier (1), the top of pier (1) is equipped with the curved beam body (2), the bottom of pier (1) is equipped with rotates the cushion cap, rotate the cushion cap and include cushion cap (3), cushion cap (4) and ball hinge structure down, it sets up on cushion cap (4) down through ball hinge structure rotation to go up cushion cap (3), its characterized in that: the bottom of going up cushion cap (3) is equipped with a plurality of auxiliary supporting legs (5) and an initiative supporting legs (6), auxiliary supporting legs (5) and initiative supporting legs (6) are the bottom of annular equipartition at cushion cap (3), just initiative supporting legs (6) are located the inner arc side of the transverse axis of curve roof beam body (2), initiative supporting legs (6) are including setting up pressure sensor (6a) and the connection in cushion cap (3) bottom slider (6b) of pressure sensor (6a) bottom.
2. The swivel curvilinear bridge configuration of claim 1, wherein: and the lower bearing platform (4) is provided with an annular slideway (7) for the auxiliary supporting leg (5) and the active supporting leg (6) to slide.
3. The swivel curvilinear bridge configuration of claim 2, wherein: and the annular slideway (7) is provided with a pair of wedge blocks (8) for pre-clamping the driving supporting leg (6).
4. The swivel curvilinear bridge configuration of claim 2, wherein: the bottom end of the sliding block (6b) is embedded with a polytetrafluoroethylene block.
5. The swivel curvilinear bridge configuration of claim 1, wherein: the auxiliary supporting legs (5) are seven, and the seven auxiliary supporting legs (5) and the one driving supporting leg (6) are annularly distributed at equal intervals at the bottom of the upper bearing platform (3).
6. The eccentric rotation construction method of the curved bridge is characterized by comprising the following steps:
s1: presetting an eccentricity according to the curve radius of the curve bridge; the curve bridge comprises a rotating bearing platform and a rotating body arranged on the rotating bearing platform, and the eccentricity is the distance of the gravity center of the rotating body deviating from the center of a spherical hinge on the rotating bearing platform;
s2: installing a rotary bearing platform and a rotary body according to a preset eccentricity parameter; the rotary bearing platform comprises an upper bearing platform, a lower bearing platform and a spherical hinge structure arranged between the upper bearing platform and the lower bearing platform, and the rotary body comprises a curved beam body and a pier;
s3: a plurality of auxiliary supporting legs and an active supporting leg are embedded at the bottom of the upper bearing platform; the auxiliary supporting legs and the active supporting legs are uniformly distributed in an annular shape, the active supporting legs are positioned on the inner arc side of the transverse axis of the curved beam body, and each active supporting leg comprises a pressure sensor and a sliding block which are connected;
s4: and the traction curve bridge and the bridge pier rotate to the target position around the spherical hinge structure.
7. The eccentric swivel construction method of a curved bridge according to claim 6, wherein in step S2, when the rotary bearing platform is installed, an annular slide way for the auxiliary support leg and the active support leg to slide is installed on the lower bearing platform.
8. The curved bridge eccentric swivel construction method according to claim 7, wherein in step S2, seven auxiliary support legs and one active support leg are embedded in the bottom of the upper bearing platform, and the seven auxiliary support legs and the one active support leg are annularly and equidistantly distributed on the bottom of the upper bearing platform.
9. The eccentric swivel construction method of a curved bridge according to claim 8, further comprising the following preparatory steps before the swivel operation is performed at step S4:
cleaning an annular slideway, respectively supporting two sides of three auxiliary supporting feet positioned on the longitudinal axis and the transverse axis of a curved bridge with a jack, vertically placing a dial indicator at the bottom of each auxiliary supporting foot, and arranging a wedge block on the annular slideway to clamp a sliding block of a driving supporting foot;
under the protection action of the jack, gradually releasing the temporary locking device of the rotor, measuring and reading the rotation condition of the rotor in real time through a dial indicator, and measuring and reading the supporting force of the driving supporting leg at the inward arc side of the transverse bridge in real time through a pressure sensor;
removing the wedge block beside the sliding block, enabling the rotor to carry out a weighing experiment by using a jack beside the auxiliary supporting leg on the longitudinal axis of the curved beam body under the common support of the spherical hinge structure and the driving supporting leg, measuring the friction coefficient at the spherical hinge, basically separating the auxiliary supporting leg from the annular slideway through the balance weight at the cantilever end of the curved beam body, and measuring and reading the supporting force at the pressure sensor in real time;
and (3) paving a polytetrafluoroethylene block on the annular slide way below the driving supporting leg, and removing all the jacks to enable the rotor to be in a preparation state before the rotor rotates.
10. The curved bridge eccentric swivel construction method according to claim 9, wherein when the dial indicator is used to measure that the rotor is rotating towards one side along the bridge, the dial indicator indicates that the rotor is unbalanced towards one side along the bridge; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, a proper counterweight is arranged at the cantilever end of the curved bridge to increase the supporting force; when the supporting force measured by the pressure sensor is smaller than a preset threshold value, the outer arc side of the curve bridge at the top of the bridge pier is properly weighted to reduce the supporting force.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007138514A (en) * | 2005-11-17 | 2007-06-07 | Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd | Erection method of girder |
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