CN113863165B - Large-section wide-span rigid frame bridge swivel weighing system and method - Google Patents
Large-section wide-span rigid frame bridge swivel weighing system and method Download PDFInfo
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- CN113863165B CN113863165B CN202111094028.2A CN202111094028A CN113863165B CN 113863165 B CN113863165 B CN 113863165B CN 202111094028 A CN202111094028 A CN 202111094028A CN 113863165 B CN113863165 B CN 113863165B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
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Abstract
The invention discloses a large-section wide-span rigid frame bridge swivel weighing system and a method, wherein the weighing system is arranged on a swivel structure of a swivel beam Duan Xiafang, the swivel structure comprises an upper turntable, a lower turntable, a rotating spherical hinge, a slideway and a plurality of supporting feet, and the swivel weighing system comprises: the jacking device is arranged on the lower rotary table, and a pressure sensor is arranged between the jacking end of the jacking device and the upper rotary table; the displacement monitoring device is arranged at one side of the supporting foot far away from the rotary spherical hinge; the data acquisition device is respectively and electrically connected with the pressure sensor and the displacement monitoring device; the control device is respectively and electrically connected with the jacking device and the data acquisition device; the counterweight device comprises a fixed frame and a plurality of counterweights, wherein the fixed frame and the counterweights are fixedly arranged on the top surface of the swivel beam section. The invention has high weighing precision and degree efficiency and can ensure construction safety.
Description
Technical Field
The invention relates to the technical field of weighing equipment for bridge swivel construction. More particularly, the invention relates to a large-section wide-span rigid frame bridge swivel weighing system and method.
Background
The bridge swivel construction refers to a technology for dynamically rotating a bridge body by means of external force bearing axis equipment to realize the positioning and folding of the bridge. The technology has the greatest application advantage that normal traffic operation is not hindered, and the technology is suitable for urban arterial road construction with higher traffic concentration. In recent years, however, the length and the rotation angle of a cantilever of a swivel beam section are increased, and as the unbalanced moment is slightly rotated by a rotating spherical hinge, the vertical displacement caused at the cantilever beam end is amplified, and the unbalanced moment and the mass balance of a rotating system must be strictly controlled, so that the anti-overturning capability is improved, and therefore, the unbalanced moment needs to be tested before rotation, and reasonable counterweight is carried out. The existing swivel beam section is mainly used for weighing, the swivel ball hinge is used for testing unbalanced moment, but as the span and the width of the swivel beam section are increased, the eccentricity of the swivel beam section is more serious and the weighing is more complicated due to uneven concrete pouring and asymmetric prestress tensioning. On the premise of not affecting or damaging the existing concrete structure, a more accurate weighing system is needed to accurately solve unbalanced moment, eccentricity and counterweight scheme of the swivel beam section.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a large-section wide-span rigid frame bridge swivel weighing system provided on a swivel structure of a swivel beam Duan Xiafang, the swivel structure including an upper swivel plate, a lower swivel plate, and a rotating spherical hinge provided therebetween, the upper swivel plate and the lower swivel plate being rotatable with respect to each other, the upper swivel plate being fixedly provided on a swivel beam Duan Xiafang, the lower swivel plate being fixedly provided on a lower table; the lower turntable is provided with an annular slideway, a plurality of supporting feet are uniformly distributed on the bottom surface of the upper turntable corresponding to the slideway, and the rotating body weighing system comprises:
the jacking device is arranged on the lower turntable and used for providing a jacking force for the upper turntable, and a pressure sensor is arranged between the jacking end of the jacking device and the upper turntable;
the displacement monitoring device is arranged on one side of the supporting foot, which is far away from the rotary spherical hinge, and is used for measuring the displacement of the rotary spherical hinge;
the data acquisition device is respectively and electrically connected with the pressure sensor and the displacement monitoring device;
the control device is respectively and electrically connected with the jacking device and the data acquisition device and is used for controlling the jacking device to apply or unload a jacking force and receiving data acquired by the data acquisition device;
the counterweight device comprises a fixed frame and a plurality of counterweights, wherein the fixed frame and the counterweights are fixedly arranged on the top surface of the swivel beam section.
Preferably, the jacking device comprises a plurality of jacking jacks and a plurality of pump stations respectively connected with the jacking jacks, part of the jacking jacks are distributed at positions of four vertex angles of the upper turntable corresponding to the lower turntable, the rest of the jacking jacks are arranged at positions of two ends of a longitudinal axis of the upper turntable corresponding to the lower turntable, and a pressure sensor is arranged between a jacking end of each jacking jack and the bottom surface of the upper turntable.
Preferably, the displacement monitoring device comprises a plurality of dial gauges, and the dial gauges are respectively arranged on the corresponding supporting feet along the longitudinal axis and the transverse axis of the upper rotary disc.
Preferably, the fixing frame comprises a plurality of connecting plates and a plurality of connecting rods; the bottom of each connecting rod is fixed on the top surface of the swivel beam section; one end of each connecting plate is a convex connecting part, and the other end of each connecting plate is a concave connecting part; the connecting plates are connected end to end in sequence, and the convex connecting parts and the concave connecting parts of two adjacent connecting plates are clamped and sleeved on one connecting rod.
Preferably, the concave connecting part, the convex connecting part and the middle part of each connecting plate are all provided with through holes matched with the connecting rods; the connecting rod is a screw rod, and the connecting plate is sleeved on the connecting rod and then fixed through a nut.
The invention also aims to provide a large-section wide-span rigid frame bridge swivel weighing method, which comprises the following steps of:
step 1, arranging the jacking device, the displacement monitoring device and the data acquisition device on the swivel structure;
step 2, judging the balance state of the swivel beam section: when the friction moment of the rotary spherical hinge is larger than the unbalanced moment of the swivel beam section, turning to the step 3; when the friction moment of the rotary spherical hinge is smaller than the unbalanced moment of the swivel beam section, turning to the step 4;
step 3, sequentially controlling jacking jacks at two sides of the upper turntable by the control device to gradually apply jacking force to the upper turntable along the longitudinal axis direction of the swivel beam section, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the abrupt change of the displacement data, the jacking jack is controlled to stop jacking, and the friction moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 4, controlling a jacking jack at one side of the supporting leg group, which is in contact with the slideway, to gradually apply a jacking force to the upper turntable by the control device, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the sudden change of the displacement data, the jacking jack is controlled to fall back step by step, the data acquisition device acquires the displacement data measured by the displacement monitoring device after each falling back, when the control device receives the sudden change of the displacement data, the jacking jack is controlled to stop falling back, and the friction moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 5, calculating the static friction coefficient of the rotating spherical hinge and the eccentric distance of the rotating beam section according to the friction moment of the rotating spherical hinge and the unbalanced moment of the rotating beam section obtained in the step 3 or the step 4;
step 6, calculating a required counter weight, and placing the corresponding counter weight on the fixing frame through a lifting appliance;
and 7, repeating the step 2-5 for repeated weighing after the counterweight is completed, wherein the eccentricity of the swivel beam section after repeated weighing meets the design requirement, and the weighing is completed when the eccentricity of the swivel beam section does not meet the design requirement, and repeating the step 6.
Preferably, the fixing frame is fixedly arranged at the position 7.5m-17.5m away from the end faces of the two sides of the swivel beam section.
Preferably, the balancing weight is a ton bag with crushed stones in the inside, each ton bag is placed close to one connecting plate in the fixing frame, and the hanging strip of each ton bag is sleeved on the connecting rod connected with the connecting plate.
Preferably, when the ton bags are stacked in multiple layers, the hanging strips of all the ton bags in the next layer are sleeved on the connecting rod, and then the connecting plate in the upper layer is installed.
The invention at least comprises the following beneficial effects:
1. according to the large-section wide-span rigid frame bridge swivel weighing system provided by the invention, the jacking device is arranged between the lower turntable and the upper turntable, the jacking force is provided for the upper turntable, the displacement of the rotary spherical hinge is measured through the displacement monitoring device in the jacking process, the rotation critical state of the rotary spherical hinge is judged through the displacement change condition of the rotary spherical hinge, and the unbalanced moment and the eccentric distance of the swivel beam section are calculated according to the displacement critical state. In the weighing process, the data acquisition device is used for acquiring the lifting force and the displacement data, the control device is used for controlling the jacking device to continuously jack up step by step in the displacement rule change stage, and when the displacement data received by the control device are suddenly changed, the control device is used for controlling the jacking device to stop jacking. The device can replace manual equipment reading and calculation, the weighing precision of a weighing system is improved, the working efficiency of a weighing link is improved, and damage and safety risk caused by untimely judgment of manual work to the soil structure of the swivel beam Duan Hunning are reduced.
2. According to the large-section wide-span rigid frame bridge swivel weighing system, a counterweight scheme is implemented by adopting the counterweight device, and the required multiple counterweights are fixed through the fixing frame, so that the problems that the large-section wide-span swivel beam section is large in required counterweight, difficult to fix, and affects construction precision, construction safety and the like in a swivel construction process are solved, and the fixing frame is simple in structure and easy to install and detach.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a front view of a weighing system according to one embodiment of the invention;
FIG. 2 is a view in the A-A direction of FIG. 1;
FIG. 3 is a top view of the holder according to the above embodiment of the present invention;
FIG. 4 is a front view of the holder according to the above embodiment of the present invention;
FIG. 5 is a front view of the connecting plate according to the above embodiment of the present invention;
FIG. 6 is a schematic diagram of M in the above embodiment of the invention Z >M G When the rotating body beam section is in a stressed schematic view, one side of the rotating body beam section is stressed;
FIG. 7 shows M in the above embodiment of the invention Z >M G When the rotating body beam section is in a stressed schematic view, the other side of the rotating body beam section is stressed;
FIG. 8 is a schematic diagram of M in the above embodiment of the invention Z <M G And when the rotating body beam section is inclined, a stress schematic diagram is formed on one side of the rotating body beam section.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
As shown in fig. 1 to 5, the invention provides a large-section wide-span rigid frame bridge swivel weighing system, which is arranged on a swivel structure of a swivel beam Duan Xiafang, wherein the swivel structure comprises an upper turntable 9, a lower turntable 2 and a rotating spherical hinge 6 arranged between the upper turntable 9 and the lower turntable 2, the upper turntable 9 and the lower turntable 2 can rotate relatively, the upper turntable 9 is fixedly arranged on the swivel beam Duan Xiafang, and the lower turntable 2 is fixedly arranged on a lower bearing platform; the lower turntable 2 is provided with an annular slideway 4, a plurality of supporting feet 7 are uniformly distributed on the bottom surface of the upper turntable 9 corresponding to the slideway 4, and the swivel weighing system comprises:
the jacking device is arranged on the lower rotary table 2 and used for providing a jacking force for the upper rotary table 9, and a pressure sensor 10 is arranged between the jacking end of the jacking device and the upper rotary table;
the displacement monitoring device is arranged on one side of the supporting foot 7 away from the rotary spherical hinge 6 and is used for measuring the displacement of the rotary spherical hinge 6;
the data acquisition device is respectively and electrically connected with the pressure sensor 10 and the displacement monitoring device;
the control device is respectively and electrically connected with the jacking device and the data acquisition device and is used for controlling the jacking device to apply or unload a jacking force and receiving data acquired by the data acquisition device;
the counterweight device comprises a fixing frame 8 fixedly arranged on the top surface of the swivel beam section and a plurality of counterweight blocks.
In this technical solution, after the pouring and installation of the swivel structure is completed, the swivel beam section is positioned at the longitudinal axis of the bridgeIn the vertical plane, the mass distribution and rigidity of the cantilever beam sections of the swivel beam Duan Liangce are different due to the manufacturing error of the spherical hinge system, the influence of the box beam flat curve factors, the difference of the beam body mass distribution and the difference of prestress tensioning degree, so that unbalanced moment M is generated G . After the consolidation measure between the lower turntable 2 and the upper turntable 9 is released, the friction torque M of the spherical hinge 6 of the rotator Z And unbalanced moment M of the swivel beam section G Under the influence of (a), the whole swivel beam Duan Hui is in a statically determinate state. Then the jacking device provides a step-by-step jacking force for the upper turntable 9 through the control device, and the data acquisition device acquires tangential rotation displacement data of the rotary spherical hinge 6 measured by the displacement monitoring device after each jacking; when the control device receives the displacement data and suddenly changes, the static state of the swivel beam section is destroyed, the unbalanced moment of the swivel beam Duan Liangce is calculated and determined according to the jacking force and the displacement data collected at the moment, the weight of the counterweight and the counterweight arm are determined according to the calculation result and the on-site working condition, the counterweight block with the corresponding weight is hoisted to the fixing frame 8, and the position of the fixing frame 8 corresponds to the counterweight arm. The data acquisition device can be a comprehensive tester matched with the pressure sensor 10 or a conventional data acquisition device. The control device can adopt processor devices such as a singlechip, realizes control of the jacking device and calculates unbalanced moment and eccentric distance of the swivel beam section according to the received jacking force and displacement data by inputting corresponding control programs and algorithm programs into the singlechip, so as to calculate the needed balance weight and balance weight arm. In the weighing process, equipment reading and calculation do not need to be manually conducted, the data acquisition device and the control device can rapidly acquire calculation and timely send instructions to the jacking device, accurate control of the weighing process is achieved, working efficiency of a weighing link is improved, and damage and safety risk caused by untimely judgment of a rotating body beam Duan Hunning soil structure are reduced.
In another embodiment, the jacking device includes a plurality of jacking jacks 1 and a plurality of pump stations respectively connected with a plurality of jacking jacks 1, wherein a part of the jacking jacks 1 are distributed at positions where four top angles of the upper turntable 9 correspond to the lower turntable 2, the rest of the jacking jacks 1 are arranged at positions where two ends of a longitudinal axis of the upper turntable 9 correspond to the lower turntable 2, and a pressure sensor 10 is arranged between a jacking end of each jacking jack 1 and a bottom surface of the upper turntable.
In this technical solution, the jacking force of the jacking jack 1 needs to meet the jacking requirement, and the number of the jacking jacks needs to be according to the total weight G of the swivel beam section and the plane radius R of the rotating spherical hinge P Static friction coefficient mu, longitudinal lift arm L Z And a transverse jacking force arm L H Lifting weight G of single lifting jack P And (3) calculating:
the lifting force required by longitudinal weighing is F Z ＝μ*G*R P /L Z The number N of the lifting jacks required for longitudinal weighing Z ＝F Z /G P The method comprises the steps of carrying out a first treatment on the surface of the The jacking force required by transverse weighing is F H ＝μ*G*R P /L H The number N of the jacking jacks required for transverse weighing H ＝F H /G P ，N Z And N H The calculation needs to be rounded upwards.
And uniformly arranging the calculated number of the jack jacks at the positions corresponding to the lower turntable 2 at the four vertex angles of the upper turntable 9 and the two ends of the longitudinal axis of the upper turntable 9. According to the height difference between the distance between the upper turntable 9 and the lower turntable 2 and the height of the jacking jack 1 and the pressure sensor 10, a cushion block can be arranged below the jacking jack 1 so that all the jacking jacks 1 are in a set initial jacking state. The lifting jack 1 is connected with the pump station, and the control device sends a logic control signal to an electromagnetic reversing valve in the pump station to control the lifting jack 1.
In another embodiment, the displacement monitoring device comprises a plurality of dial gauges 5, and the dial gauges 5 are respectively arranged on the corresponding supporting feet 7 along the longitudinal axis and the transverse axis of the upper turntable.
In this technical scheme, the dial indicator 5 adopts a digital display dial indicator, and an output interface of the digital display dial indicator is connected with the data acquisition device. In this embodiment, four dial indicators 5 are respectively disposed along the longitudinal axis and the transverse axis of the upper turntable at the outer sides of the corresponding supporting feet 7, that is, at the side far away from the rotating spherical hinge 6.
In another embodiment, the fixing frame 8 includes a plurality of connection plates 82 and a plurality of connection rods 81; the bottom of each connecting rod 81 is fixed on the top surface of the swivel beam section; one end of each connecting plate 82 is a male connecting portion 821, and the other end is a female connecting portion 824; the plurality of connection plates 82 are connected end to end in sequence, and the male connection portion 821 and the female connection portion 824 of two adjacent connection plates 82 are engaged and then sleeved on one connection rod 81.
In this embodiment, the plurality of connection plates 82 are connected end to end in sequence to form a closed structure, and the closed structure may be configured as a quadrangle or a polygon according to the number of the balancing weights. When the weight is applied, the weight is placed inside the connecting plate 82. When the balancing weight forms a closed structure with the connecting plate 82, the fixing frame 8 may be further disposed in the inner space when the inner space is larger, that is, the balancing weight is sandwiched between the two fixing frames 8. The connecting plate 82 and the connecting rod 81 are of a detachable structure, and the counterweight is convenient to detach and reuse when the counterweight is unloaded.
In another embodiment, the concave connection part 824, the convex connection part 821 and the middle part of each connection plate 82 are all provided with through holes matched with the connection rods 81; the connecting rod 81 is a screw rod, and the connecting plate 82 is sleeved on the connecting rod 81 and then fixed by a nut.
In this technical scheme, both ends and the centre of connecting plate 82 all overlap and establish on connecting rod 81, strengthen the stability of connecting plate 82, when the balancing weight adopts ton bag, the suspender of ton bag can overlap and hang with connecting rod 81 of connecting plate 82 intermediate junction. When the balancing weights need to be stacked, multiple layers of connecting plates 82 can be correspondingly arranged, and the positions of the connecting plates 82 on the connecting plates 81 are fixed through nuts.
A weighing method using the large-section wide-width cross-rigid frame bridge swivel weighing system comprises the following steps:
step 1, arranging the jacking device, the displacement monitoring device and the data acquisition device on the swivel structure;
step 2, judging the balance state of the swivel beam section: when the friction moment of the rotary spherical hinge is larger than the unbalanced moment of the swivel beam section, turning to the step 3; when the friction moment of the rotary spherical hinge is smaller than the unbalanced moment of the swivel beam section, turning to the step 4;
step 3, sequentially controlling jacking jacks 1 on two sides of the upper turntable 9 to gradually apply jacking force to the upper turntable 9 through the control device along the longitudinal axis direction of the swivel beam section, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the abrupt change of the displacement data, the jacking jack 1 is controlled to stop jacking, and the friction moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 4, controlling the jacking jack 1 at the side, contacted with the slideway 4, of the supporting feet 7 to gradually apply a jacking force to the upper turntable 9 through the control device, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the sudden change of the displacement data, the jacking jack 1 is controlled to fall back step by step, the data acquisition device acquires the displacement data measured by the displacement monitoring device after each falling back, when the control device receives the sudden change of the displacement data, the jacking jack 1 is controlled to stop falling back, and the friction resistance moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 5, calculating the static friction coefficient of the rotary spherical hinge 6 and the eccentric distance of the rotary beam section according to the friction moment of the rotary spherical hinge and the unbalanced moment of the rotary beam section obtained in the step 3 or the step 4;
step 6, calculating a required counter weight, and placing the corresponding counter weight on the fixing frame through a lifting appliance;
and 7, repeating the step 2-5 for repeated weighing after the counterweight is completed, wherein the eccentricity of the swivel beam section after repeated weighing meets the design requirement, and the weighing is completed when the eccentricity of the swivel beam section does not meet the design requirement, and repeating the step 6.
In this technical scheme, in step 2, the balance state of the beam section of the rotating body is determined according to the states of the two ends of the rotating body after the consolidation measure between the upper rotating disk 9 and the lower rotating disk 2 is released: when the friction moment M of the rotary spherical hinge 6 Z An unbalanced moment M greater than the swivel beam section G When in use, the swivel beam section does not rotate around the rigid body of the rotating spherical hinge, and the whole balance is formed by M Z And M G Holding; when the friction moment M of the rotary spherical hinge Z An unbalanced moment M smaller than the swivel beam section G When the swivel beam section rotates around the rigid body of the rotary spherical hinge 6 until the supporting feet 7 at one side are contacted with the slideway 4, the whole balance is formed by M Z 、M G And the moment of the supporting feet 7 to the sphere center of the rotary spherical hinge 6 is maintained.
In step 3, as shown in fig. 6 and 7, when the pressure sensor 10 measures that the lifting force is applied to both sides of the upper turntable 9 respectively, so that the lifting force when the displacement value measured by the dial indicator 5 is suddenly changed is P1 and P2 respectively, and the moment arms corresponding to P1 and P2 are L1 and L2 respectively, then P 1 ·L 1 +M G ＝M Z 、P 2 ·L 2 ＝M G +M Z Can be obtained
The calculation process is completed by inputting a corresponding program into the control device and receiving data transmitted by the data acquisition device.
In step 4, as shown in FIG. 8, the support legs 7 on the side where the swivel beam sections are tilted are in contact with the slide 4, and the center of gravity of the swivel beam sections is deviated to the sideTherefore, a lifting force is applied to the upper turntable at the side, and the lifting force is gradually increased from the moment that the supporting feet 7 leave the slideway 4 until the rotating spherical hinge 6 rotates slightly, namely, when the displacement value measured by the dial indicator 5 changes suddenly, the lifting force is P3, and the corresponding force arms are L3 and P 3 ·L 3 ＝M G +M Z The method comprises the steps of carrying out a first treatment on the surface of the Then the lifting jack 1 is gradually fallen back until the rotary spherical hinge 6 is slightly rotated again in the falling back process, namely, when the displacement value measured by the dial indicator 5 is mutated again, the lifting force at the moment is P3', P 3 ′·L 3 ＝M G -M Z The method comprises the steps of carrying out a first treatment on the surface of the Is available in the form of
The calculation process is completed by inputting a corresponding program into the control device and receiving data transmitted by the data acquisition device.
In step 5, the coefficient of static friction resistance μz of the rotary spherical hinge 6 and the eccentricity e of the swivel beam section are calculated by the following formula,
wherein R is the spherical radius of the rotary table sliding surface of the rotary spherical hinge 6.
For the wide span swivel beam section, besides weighing along the two sides of the longitudinal axis, the transverse axis direction also needs to be weighed, and the weighing method is the same as that of the step 2-5, so that the eccentricity e is accurately calculated, and the counterweight position and the counterweight weight are determined.
In step 6, the counter weight is calculated according to the absolute balance weight scheme of the swivel beam section, that is, the swivel Liang Duanying slightly takes a balanced state in the beam axis direction in the swivel process, and the supporting feet 7 do not contact the slideway 4, so that the swivel beam section is stressed symmetrically in the swivel traction process, and the stability in the vertical plane is increased. The counterweight may be calculated as follows:
wherein L is a counterweight moment arm.
In the step 7, the eccentricity of the re-weighed swivel beam section meets the requirement of 5 < e < 15 cm.
In another embodiment, the fixing frame 8 is fixedly arranged at 7.5m-17.5m from the end faces of the two sides of the swivel beam section. The weight position, i.e. the position in which the holder 8 is mounted, is determined within this range.
In another embodiment, the balancing weights are ton bags containing crushed stones inside, each ton bag is placed close to one connecting plate 82 in the fixing frame 8, and the hanging strips of the ton bags are sleeved on the connecting rods 81 connected with the connecting plates 82.
In the technical scheme, the balancing weight can adopt a ton bag for weight used by the swivel beam section in pouring so as to save construction cost; support is provided to the side of ton bag through connecting plate 82, through end to end the connecting plate 82 will a plurality of ton bag gathers together and places, further prevents that it from taking place the side direction slope or sliding to when solving the counter weight volume great, adopt the difficult problem of tying up and fixing of reinforcing bar.
In another embodiment, when stacking the ton bags in multiple layers, the hanging strips of all the ton bags in the next layer are sleeved on the connecting rod 81, and then the connecting plate 82 in the upper layer is installed.
In the technical scheme, in order to accurately obtain the size of the counterweight arm, the occupied area of the counterweight should be reduced as much as possible, and the counterweight is gathered towards the set counterweight point, so that the ton bags can be stacked in multiple layers. Considering that crushed stones contained in the ton bags can cause irregular shapes of the ton bags, and the stacking is unstable. Therefore, the hanging strips of all ton bags in the next layer are sleeved on the connecting rod 81, then the connecting plate 82 of the upper layer is installed, and in order to further ensure that the ton bags in the upper layer do not slide off, a fixing frame 8 can be additionally arranged in the inner space formed by gathering the ton bags, and the ton bags are clamped between the inner fixing frame 8 and the outer fixing frame 8.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (5)
1. The large-section wide-span rigid frame bridge swivel weighing system is arranged on a swivel structure of a swivel beam Duan Xiafang, the swivel structure comprises an upper turntable, a lower turntable and a rotating spherical hinge arranged between the upper turntable and the lower turntable, the upper turntable and the lower turntable can rotate relatively, the upper turntable is fixedly arranged on the swivel beam Duan Xiafang, and the lower turntable is fixedly arranged on a lower bearing platform; be provided with annular slide on the lower carousel, the bottom surface of going up the carousel corresponds the position evenly distributed of slide has a plurality of spike, its characterized in that, the rotation weighing system includes:
the jacking device is arranged on the lower turntable and used for providing a jacking force for the upper turntable, and a pressure sensor is arranged between the jacking end of the jacking device and the upper turntable;
the displacement monitoring device is arranged on one side of the supporting foot, which is far away from the rotary spherical hinge, and is used for measuring the displacement of the rotary spherical hinge;
the data acquisition device is respectively and electrically connected with the pressure sensor and the displacement monitoring device;
the control device is respectively and electrically connected with the jacking device and the data acquisition device and is used for controlling the jacking device to apply or unload a jacking force and receiving data acquired by the data acquisition device;
the counterweight device comprises a fixed frame and a plurality of counterweight blocks, wherein the fixed frame and the counterweight blocks are fixedly arranged on the top surface of the swivel beam section;
the fixing frame comprises a plurality of connecting plates and a plurality of connecting rods; the bottom of each connecting rod is fixed on the top surface of the swivel beam section; one end of each connecting plate is a convex connecting part, and the other end of each connecting plate is a concave connecting part; the connecting plates are connected end to end in sequence, and the convex connecting parts and the concave connecting parts of two adjacent connecting plates are clamped and sleeved on one connecting rod; the connecting plates are sequentially connected end to form a closed structure, and the closed structure can be set to be quadrilateral or polygonal according to the number of the balancing weights; when the counterweight is carried out, the counterweight is placed on the inner side of the connecting plate; when the balancing weight forms a closed structure along with the connecting plate and the inner space is larger, a circle of fixing frames can be arranged in the balancing weight, namely the balancing weight is clamped between the two fixing frames; a detachable structure is arranged between the connecting plate and the connecting rod;
the fixing frame is fixedly arranged at the position 7.5m-17.5m away from the end surfaces of the two sides of the swivel beam section;
the balancing weight is a ton bag with crushed stones in the interior, each ton bag is placed close to one connecting plate in the fixing frame, and the hanging strip of each ton bag is sleeved on the connecting rod connected with the connecting plate; when the ton bags are required to be stacked in multiple layers, hanging strips of all the ton bags on the next layer are sleeved on the connecting rods, and then the connecting plates on the upper layer are installed.
2. The large-section wide-span rigid frame bridge swivel weighing system of claim 1, wherein the jacking device comprises a plurality of jacking jacks and a plurality of pump stations respectively connected with the jacking jacks, part of the jacking jacks are distributed at positions of four vertex angles of the upper turntable corresponding to the lower turntable, the rest of the jacking jacks are arranged at positions of two ends of a longitudinal axis of the upper turntable corresponding to the lower turntable, and the pressure sensor is arranged between a jacking end of each jacking jack and the bottom surface of the upper turntable.
3. The large-section wide-span rigid frame bridge swivel weighing system of claim 1, wherein the displacement monitoring device comprises a plurality of dial gauges respectively arranged on the corresponding supporting feet along the longitudinal axis and the transverse axis of the upper turntable.
4. The large-section wide-span rigid frame bridge swivel weighing system of claim 1, wherein the concave connecting part, the convex connecting part and the middle part of each connecting plate are all provided with through holes matched with the connecting rods; the connecting rod is a screw rod, and the connecting plate is sleeved on the connecting rod and then fixed through a nut.
5. A weighing method using the large-section wide-span rigid frame bridge swivel weighing system as claimed in any one of claims 1 to 4, characterized by comprising the steps of:
step 1, arranging the jacking device, the displacement monitoring device and the data acquisition device on the swivel structure;
step 2, judging the balance state of the swivel beam section: when the friction moment of the rotary spherical hinge is larger than the unbalanced moment of the swivel beam section, turning to the step 3; when the friction moment of the rotary spherical hinge is smaller than the unbalanced moment of the swivel beam section, turning to the step 4;
step 3, sequentially controlling jacking jacks at two sides of the upper turntable by the control device to gradually apply jacking force to the upper turntable along the longitudinal axis direction of the swivel beam section, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the abrupt change of the displacement data, the jacking jack is controlled to stop jacking, and the friction moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 4, controlling a jacking jack at one side of the supporting leg group, which is in contact with the slideway, to gradually apply a jacking force to the upper turntable by the control device, and acquiring displacement data measured by the displacement monitoring device after each jacking by the data acquisition device; when the control device receives the sudden change of the displacement data, the jacking jack is controlled to fall back step by step, the data acquisition device acquires the displacement data measured by the displacement monitoring device after each falling back, when the control device receives the sudden change of the displacement data, the jacking jack is controlled to stop falling back, and the friction moment of the rotary spherical hinge and the unbalanced moment of the swivel beam section are calculated according to the measured data;
step 5, calculating the static friction coefficient of the rotating spherical hinge and the eccentric distance of the rotating beam section according to the friction moment of the rotating spherical hinge and the unbalanced moment of the rotating beam section obtained in the step 3 or the step 4; the coefficient of static friction resistance mu z of the rotary spherical hinge and the eccentricity e of the swivel beam section are calculated by the following formula,
、/>
wherein R is the spherical radius of the sliding surface of the rotary spherical hinge turntable;
step 6, calculating a required counter weight, and placing the corresponding counter weight on the fixing frame through a lifting appliance; the counter weight is calculated according to an absolute balance weight scheme of the swivel beam section, the swivel Liang Duanying slightly takes a balanced state in the beam axis direction in the swivel process, and the supporting feet do not contact the slideway, so that the swivel beam section is stressed symmetrically in the swivel traction process; the weight is calculated as follows:
wherein L is a counterweight moment arm;
step 7, repeating the step 2-5 for repeated weighing after the balance weight is finished, wherein the eccentricity of the swivel beam section after repeated weighing meets the design requirement, the weighing is finished, and the step 6 is repeated if the eccentricity of the swivel beam section does not meet the design requirement; the eccentricity of the swivel beam section after re-weighing should meet the requirement that e is more than 5 and less than 15 cm.
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