Closing construction device and method for arch ribs in arch bridge

Abstract

The invention relates to the technical field of bridge erection, in particular to a closure construction device and method for arch ribs in an arch bridge, and the device comprises a laser ranging mechanism and a target mechanism. The laser ranging mechanism is used for being arranged at the end of a rib limb of an edge rib section erected at a theoretical position, the laser ranging mechanism comprises a laser range finder and a clinometer, and the clinometer is used for adjusting the angle of laser emitted by the laser range finder in a matched mode. The laser is parallel to a theoretical chord line formed by the theoretical position of the end part of the middle arch rib section and the theoretical position of the end part of the side rib section; the target mechanism is used for being arranged at the end of a rib limb of the middle arch rib section and corresponds to the laser distance measuring mechanism in position so as to receive laser emitted by the laser distance measuring instrument, and the position of the middle arch rib section can be adjusted to be within the construction allowable error range in a matched mode. The problems that in the prior art, constructors need to work aloft, firstly measure data and then operate construction equipment to adjust the matching relation of the closure gap, so that the construction efficiency is low, and meanwhile the safety risk of high-altitude construction work is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge erection, and in particular to a construction device and method for closure of arch ribs in an arch bridge. Background Art

[0002] To ensure the theoretical alignment of the main bridge and arch ribs, large-segment low-position support is generally used to erect arch rib segments on high-speed railways. These segments are generally divided into three sections: two side arch rib segments and the large-segment middle arch rib. The support construction method of beam-first and arch-later is adopted. After the main beam is assembled on the beam assembly support, the side arch rib assembly support and the large-segment middle arch rib low-position assembly support are set up on the main beam. The two side arch ribs and the large-segment middle arch rib are assembled in sequence. After the two side arch ribs are assembled, the large-segment middle arch rib is assembled at a low position. After the low-position assembly of the large-segment middle arch rib is completed, the lifting frame and sling are installed. At the same time, horizontal cables are installed at both ends of the large-segment middle arch rib for horizontal tensioning. The large-segment middle arch rib is then lifted to the closure position, and the small closure section is installed to close the closure in place. The Tuojiang Bridge on the high-speed railway has an arch rib in a large section, which is more than 170 meters long and weighs about 2,000 tons. The arch ribs in the large section account for more than half of the total length of the arch ribs. It is more than 170 meters long and weighs about 2,000 tons. Two closures and two 2-meter-long closure sections are set. The closure of the arch ribs in the large section weighing about 2,000 tons is difficult to construct, and there are great safety risks in construction and measurement. The closure requires that the distance between the end face of the closure on the arch rib side of the large section and the end face of the closure on the side of the arch rib be precisely matched, with an accuracy of millimeters.

[0003] In the related art, the closure of the arch ribs in large sections of traditional arch bridges is carried out by manual measurement and manual construction respectively. The measurement-construction-measurement-construction cycle is repeated, and the manual work is complicated. The closure measurement generally adopts the polar coordinate method of the total station with multiple station settings. There are two closure openings and four end faces between the two ends of the arch ribs and the top end faces of the two side arch ribs in the large section. Each arch rib includes four arch rib limbs. There are four pairs of arch rib limbs on both sides of each closure opening. It is necessary to set a measuring point on each of the 16 arch rib limb steel pipe openings on both sides of the two closure openings, for a total of 16 measuring points. Because the construction facilities and the 16 arch rib limb steel pipe openings block each other, it is necessary to set up total stations on the ground and the bridge deck for observation multiple times. The measurement work is complicated, the multiple station settings lead to large cumulative measurement errors, low closure measurement accuracy, and low work efficiency. In traditional arch bridges, arch rib closures in large sections are achieved using manually controlled mechanical jacks. Construction workers operate construction equipment to adjust the matching relationship of the closure mouths based on measurement data. Measurement and construction are not coordinated and the pace is inconsistent, making it difficult to accurately adjust the two closure mouths synchronously. This results in low work efficiency and high safety risks during high-altitude construction operations. Summary of the Invention

[0004] In response to the defects in the prior art, the purpose of the present invention is to provide a device and method for the construction of arch rib closure in an arch bridge, which can solve the problem in the prior art that construction personnel need to work at high altitude, first measure data, and then operate construction equipment to adjust the matching relationship of the closure mouth, resulting in low construction efficiency and high safety risks in high-altitude construction operations.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] In one aspect, the present invention provides a construction device for closure of an arch rib in an arch bridge, comprising:

[0007] A laser distance measuring mechanism is provided at the end of a side rib segment rib that has been erected at a theoretical position. The laser distance measuring mechanism includes a laser distance meter and an inclinometer. The inclinometer is used to coordinately adjust the angle of the laser emitted by the laser distance meter so that the laser is parallel to a theoretical chord formed by the theoretical positions of the ends of the middle arch rib segment and the side rib segment.

[0008] The target mechanism is arranged at the end of the rib limb of the middle arch rib segment and corresponds to the position of the laser ranging mechanism to receive the laser emitted by the laser rangefinder and cooperate to adjust the position of the middle arch rib segment to within the allowable construction error range.

[0009] In some optional solutions, the laser ranging mechanism further includes:

[0010] A first magnetic block, one side of which is used to mount the laser rangefinder, and the other side of which is used to be adsorbed on the outside of the rib limb of the side rib segment;

[0011] A magnetic gasket, which is provided between the first magnetic block and the rib limb of the side rib segment, and is used to adjust the distance between the laser rangefinder and the center of the rib limb of the side rib segment;

[0012] The adjustment component is used to adjust the tilt angle of the laser rangefinder.

[0013] In some optional embodiments, the target mechanism includes:

[0014] A second magnetic block is used to be attached to the outer side of the rib limb of the middle arch rib segment;

[0015] a laser target, which is used to receive the laser emitted by the laser rangefinder;

[0016] The connecting frame has two ends connected to the second magnetic block and the laser target respectively, and is used to adjust the placement angle of the laser target and the spacing between the centers of the rib limbs of the arch rib segments.

[0017] In some optional schemes, the connecting frame includes a first connecting plate and a second connecting plate, one end of the first connecting plate is connected to the second magnetic block and is provided with an oblong hole, one end of the second connecting plate is connected to the laser target and is provided with a through hole, and the first connecting plate and the second connecting plate are connected by fastening screws passing through the oblong hole and the through hole.

[0018] In some optional solutions, a level bubble for leveling is provided on the laser target.

[0019] In some optional solutions, the arch rib closure construction device in the arch bridge further includes:

[0020] A tensioning jack, which is used to be installed at the end of the middle arch rib segment to tension the two ends of the middle arch rib segment;

[0021] a lifting mechanism, which is used to lift and adjust the vertical position of the middle arch rib segment;

[0022] A central controller is connected to the tensioning jack and the lifting mechanism by signal connection, and is used to control the lifting mechanism to lift the height of the middle arch rib segment according to the distance between the end of the middle arch rib segment and the end of the side rib segment measured by the laser rangefinder, and to control the tensioning force applied by the tensioning jack to tension the two ends of the middle arch rib segment.

[0023] On the other hand, the present invention further provides a method for closure of an arch rib in an arch bridge, which is implemented using any of the above-mentioned devices for closure of an arch rib in an arch bridge, and comprises the following steps:

[0024] Adjust the angle of the laser emitted by the laser rangefinder installed at the end of the side rib segment at the theoretical position so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment and the theoretical position of the end of the side rib segment;

[0025] Tension the two ends of the middle arch rib segment to the theoretical tension, and lift the middle arch rib segment to the initial position;

[0026] The laser rangefinder is used to measure the distance between the end of the middle arch rib segment and the end of the side rib segment, and by adjusting the tension and height at both ends of the middle arch rib segment, the distance between the end of the middle arch rib segment and the end of the side rib segment meets the allowable construction error range.

[0027] In some optional solutions, adjusting the angle of laser light emitted by a laser rangefinder installed at the theoretical position of the side rib segment end so that the laser light is parallel to a theoretical chord formed by the theoretical position of the middle arch rib segment end and the theoretical position of the side rib segment end includes:

[0028] Obtain the inclination angle corresponding to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment and the theoretical position of the end of the side rib segment;

[0029] Adjust the angle of the laser emitted by the laser rangefinder installed at the end of the rib limb of the upper rib segment at the theoretical position, and read the detection data of the inclinometer until the angle of the laser corresponds to the inclination angle of the theoretical chord.

[0030] In some optional solutions, the step of tensioning both ends of the middle arch rib segment to a theoretical tension and lifting the middle arch rib segment to an initial position includes:

[0031] Installing tensioning jacks at the ends of the middle arch rib segment, and tensioning both ends of the middle arch rib segment to a theoretical tension;

[0032] A target mechanism is provided at the end of the rib limb of the middle arch rib segment;

[0033] A lifting jack is installed on the top surface of the lifting frame, and the lifting jack lifts the middle arch rib segment to a set height to an initial position through a sling.

[0034] In some optional solutions, the method of measuring the distance between the end of the middle arch rib segment and the end of the side rib segment using the laser rangefinder and adjusting the tension and height at both ends of the middle arch rib segment so that the distance between the end of the middle arch rib segment and the end of the side rib segment meets the allowable construction error range includes:

[0035] Using a laser rangefinder, measuring the actual distance between the target mechanism on the end of the middle arch rib segment and the end of the side rib segment;

[0036] Obtaining a longitudinal deviation between a theoretical distance and an actual distance between a target mechanism on an end portion of the middle arch rib segment and an end portion of the side rib segment;

[0037] When the longitudinal deviation exceeds the allowable longitudinal deviation and / or the vertical height difference exceeds the allowable vertical height difference, the tensioning force of the tensioning jack is adjusted and the height of the middle arch rib segment is adjusted by the lifting jack until the longitudinal deviation is less than the allowable longitudinal deviation and the vertical height difference meets the allowable vertical height difference.

[0038] Compared with existing technologies, the advantages of the present invention are: A laser distance measurement mechanism pre-installed in the side rib segments and a target mechanism installed at the end of the middle arch rib segment work together to simultaneously measure the matching relationship between the end faces of the side rib and middle arch rib closures, allowing for real-time adjustment of the closures for closure. This solves the problems of traditional manual measurement and closure construction, which is complex, poses significant safety risks, and exhibits low accuracy and work efficiency. The target mechanism and laser distance measurement mechanism cleverly replace the traditional polar coordinate measurement method that requires multiple station setups with a total station, directly measuring the distance between the end faces of the closure on the middle arch rib side of a large segment and the end faces of the closure on the side arch rib side, greatly improving the matching accuracy of the closure end faces. Furthermore, measurement and construction can be coordinated and synchronized, significantly improving closure efficiency and significantly reducing the safety risks of high-altitude measurement and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 Schematic diagram of the structure of the arch rib closure construction device in an arch bridge according to an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of the distance measuring mechanism in an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of the structure of the target mechanism in an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of the tensioning jack and the lifting mechanism in an embodiment of the present invention.

[0044] In the figure: 1. Distance measuring mechanism; 11. Laser rangefinder; 12. Inclinometer; 13. First magnetic block; 131. First magnetic switch; 14. Magnetic gasket; 15. Adjustment assembly; 2. Target mechanism; 21. Second magnetic block; 211. Second magnetic switch; 22. Connecting frame; 221. First connecting plate; 222. Second connecting plate; 223. Fastening screw; 23. Laser target; 24. Level bubble; 3. Side rib segment; 4. Middle arch rib segment; 5. Tensioning jack; 6. Lifting mechanism; 61. Lifting jack; 62. Lifting frame; 63. Sling. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0047] like Figure 1 As shown, on the one hand, the present invention provides an arch rib closure construction device for an arch bridge, comprising: a laser ranging mechanism 1 and a target mechanism 2.

[0048] Among them, the laser ranging mechanism 1 is used to be set at the end of the rib limb of the side rib segment 3 that has been erected at the theoretical position. The laser ranging mechanism 1 includes a laser rangefinder 11 and an inclinometer 12. The inclinometer 12 is used to cooperate with adjusting the angle of the laser emitted by the laser rangefinder 11 so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment 4 and the theoretical position of the end of the side rib segment 3; the target mechanism 2 is used to be set at the end of the rib limb of the middle arch rib segment 4, and corresponds to the position of the laser ranging mechanism 1, so as to receive the laser emitted by the laser rangefinder 11, and cooperate with adjusting the position of the middle arch rib segment 4 to within the allowable construction error range.

[0049] When using the arch rib closure construction device for the arch bridge, the laser distance measuring mechanism 1 is installed at the end of the rib limb of the side rib segment 3 that has been erected at the theoretical position, and the target mechanism 2 is installed at the end of the rib limb of the middle arch rib segment 4; the angle of the laser emitted by the laser distance measuring device 11 is adjusted so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment 4 and the theoretical position of the end of the side rib segment 3, the two ends of the middle arch rib segment 4 are tensioned to the theoretical tension, and the middle arch rib segment 4 is lifted to the initial position; the distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3 is measured using the laser distance measuring device 11, and by adjusting the tension and height of the two ends of the middle arch rib segment 4, the distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3 meets the construction allowable error range.

[0050] This solution utilizes the laser distance measuring mechanism 1 pre-installed on the side rib segment 3 and the target mechanism 2 installed on the end of the middle arch rib segment 4 to cooperate with each other, synchronously measure the matching relationship between the end faces of the joint mouth of the side rib segment 3 and the middle arch rib segment 4, and adjust the joint mouth in real time to close the joint, solving the problems of traditional manual measurement and joint construction one by one, which has complex procedures, high safety risks, low accuracy and low work efficiency; cleverly utilize the target mechanism 2 and the laser distance measuring mechanism 1 to replace the traditional total station polar coordinate measurement with multiple station settings, directly measure the distance between the end face of the joint mouth on the middle arch rib side of the large segment and the end face of the joint mouth on the side arch rib, greatly improving the matching accuracy of the end face of the joint mouth.

[0051] In addition, the target mechanism 2 and the laser rangefinder mechanism 1 are installed in advance, and the position of the target mechanism 2 is adjusted. The data detected by the laser rangefinder 11 are matched with the intelligently controllable middle arch rib segment tensioning mechanism and the middle arch rib segment lifting mechanism. The data detected by the laser rangefinder 11 can be received by the central controller, and control instructions for the tensioning mechanism and the lifting mechanism are issued according to the detection data, so as to realize the mutual coordination and synchronous operation of measurement and construction, significantly improve the efficiency of joint construction, and significantly reduce the safety risks of high-altitude measurement and construction.

[0052] In this example, if Figure 1As shown, the end centers of the side rib segments 3 at both ends of the arch rib are A1, B1, C1, D1 and A4, B4, C4, D4, respectively. Laser ranging mechanisms 1 are installed on the outer sides of the rib limbs corresponding to A1, B1, C1, D1 and A4, B4, C4, D4. The end centers of the middle rib segments 4 at both ends are A2, B2, C2, D2 and A3, B3, C3, D3, respectively. Target mechanisms 2 are installed on the outer sides of the rib limbs corresponding to A2, B2, C2, D2 and A3, B3, C3, D3. When the middle arch rib segment 4 is placed to the theoretical position, the chord lines A1 A2, B1 B2, C1 C2, D1D2 formed by A1, B1, C1, D1 and A2, B2, C2, D2, and the chord lines A3 A4, B3 B4, C3C4, D3D4 formed by A4, B4, C4, D4 and A3, B3, C3, D3 should be within the set range with the corresponding theoretical linear errors.

[0053] Before installing the laser ranging mechanism 1, the side rib segment 3 is installed in its theoretical design position and fixed. A laser ranging mechanism 1 is set at the end of each rib limb of the side rib segment 3, and the target mechanism 2 is installed at the end of the rib limb of the middle arch rib segment 4. The positions of the laser ranging mechanism 1 and the target mechanism 2 relative to the rib limbs of the side rib segment 3 and the rib limbs of the middle arch rib segment 4 are aligned. The distance from the point where the laser rangefinder 11 emits the laser to the center points A1, B1, C1, D1, A4, B4, C4, and D4 of the corresponding side rib segment 3 rib limbs is equal to the distance from the center of the target mechanism 2 to the center points A2, B2, C2, D2, A3, B3, C3, and D3 of the corresponding rib limbs of the middle arch rib segment 4. The laser light emitted by the laser rangefinder 11 is made parallel to the theoretical chord formed by the theoretical positions of the center points of the ends of the rib limbs of the middle arch rib segment 4 and the theoretical positions of the center points of the ends of the rib limbs of the side rib segments 3. When the middle arch rib segment 4 is lifted so that the center of the target mechanism 2 receives the laser light emitted by the laser rangefinder 11, the end of the middle arch rib segment 4 must be on the theoretical chord. At this time, it is only necessary to make the distance between the laser rangefinder 11 and the target mechanism 2, that is, the distance between the center points of the ends of the middle arch rib segment 4 and the center points of the ends of the side rib segments 3, meet the construction allowable error range, and then it can be considered that the middle arch rib segment 4 has moved to the set position.

[0054] like Figure 2 As shown, the laser distance measuring mechanism 1 preferably further includes: a first magnetic block 13, a magnetic washer 14, and an adjustment assembly 15. The first magnetic block 13 has one side for mounting the laser distance measuring device 11, and the other side for adsorption on the outer side of the rib of the side rib segment 3. The magnetic washer 14 is disposed between the first magnetic block 13 and the rib of the side rib segment 3 to adjust the distance between the laser distance measuring device 11 and the center of the rib of the side rib segment 3. The adjustment assembly 15 is used to adjust the tilt angle of the laser distance measuring device 11.

[0055] In this embodiment, the inclinometer 12 is provided above the laser rangefinder 11 and is used to detect the angle at which the laser rangefinder 11 emits a laser. The laser rangefinder 11 is installed on the first magnetic block 13, so that the laser rangefinder 11 can be conveniently installed on the rib of the side rib segment 3, and can be installed in place directly by magnetic attraction. A magnetic gasket 14 is also provided on the outside of the first magnetic block 13. By adjusting the thickness of the magnetic gasket 14, the distance between the laser rangefinder 11 and the center of the rib of the side rib segment 3 can be adjusted. In addition, an adjustment component 15 is provided between the first magnetic block 13 and the laser rangefinder 11 for adjusting the inclination angle of the laser rangefinder 11 so that the angle at which the laser rangefinder 11 emits a laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment 4 and the theoretical position of the end of the side rib segment 3.

[0056] In this example, the adjustment component 15 is a mechanism that can adjust the tilt angle of the laser rangefinder 11. Two support parts with adjustable support heights can be used to connect the first magnetic block 13 and the laser rangefinder 11. The two support parts with adjustable support heights are arranged at intervals along the direction of light emitted by the laser rangefinder 11. By adjusting the interval distance between the front and rear ends of the laser rangefinder 11 and the first magnetic block 13, the tilt angle of the laser rangefinder 11 can be adjusted.

[0057] The first magnetic block 13 is an electromagnetic attraction mechanism, and the first magnetic switch 131 can control the power on and off of the first magnetic block 13 to generate a magnetic attraction force so that the first magnetic block 13 can be adsorbed on the outside of the rib limb of the side rib segment 3, or eliminate the magnetic attraction force so that the first magnetic block 13 can be removed from the outside of the rib limb of the side rib segment 3.

[0058] like Figure 3 As shown, preferably, the target mechanism 2 includes: a second magnetic block 21, a laser target 23 and a connecting frame 22, the second magnetic block 21 is used to be adsorbed on the outside of the rib limb of the middle arch rib segment 4; the laser target 23 is used to receive the laser emitted by the laser rangefinder 11; the two ends of the connecting frame 22 are respectively connected to the second magnetic block 21 and the laser target 23, and are used to adjust the placement angle of the laser target 23 and the spacing between the centers of the rib limbs of the middle arch rib segment 4.

[0059] In this embodiment, the target mechanism 2 can be quickly installed and disassembled by the second magnetic block 21, and the placement angle of the laser target 23 and the spacing between the rib centers of the middle arch rib segment 4 can be adjusted by the connecting frame 22, so that the distance from the point where each laser rangefinder 11 emits the laser to the center point A1, B1, C1, D1, A4, B4, C4, D4 of the rib limb of the corresponding side rib segment 3 is equal to the distance from the center of each laser target 23 to the center point A2, B2, C2, D2, A3, B3, C3 and D3 of the rib limb of the corresponding middle arch rib segment 4.

[0060] The second magnetic block 21 is an electromagnetic attraction mechanism, and the second magnetic switch 211 can control the power on and off of the second magnetic block 21 to generate a magnetic attraction force so that the second magnetic block 21 can be adsorbed on the outside of the rib limb of the middle arch rib segment 4, or eliminate the magnetic attraction force so that the second magnetic block 21 can be removed from the outside of the rib limb of the middle arch rib segment 4.

[0061] Preferably, the connecting frame 22 includes a first connecting plate 221 and a second connecting plate 222, one end of the first connecting plate 221 is connected to the second magnetic block 21 and is provided with an oblong hole, one end of the second connecting plate 222 is connected to the laser target 23 and is provided with a through hole, and the first connecting plate 221 and the second connecting plate 222 are connected by fastening screws 223 passing through the oblong hole and the through hole.

[0062] In this example, when it is necessary to adjust the placement angle of the laser target 23, the placement angle of the laser target 23 can be adjusted by adjusting the relative angle between the first connecting plate 221 and the second connecting plate 222; in addition, when it is necessary to adjust the spacing between the centers of the rib limbs of the arch rib segment 4 in the interval of the laser target 23, the relative position between the first connecting plate 221 and the second connecting plate 222 can be adjusted by setting oblong holes and through holes on the first connecting plate 221 and the second connecting plate 222, thereby adjusting the spacing between the centers of the rib limbs of the arch rib segment 4 in the interval of the laser target 23.

[0063] In addition, in actual use, magnetic grooves that match the shape of the first magnetic block 13 and the second magnetic block 21 can be set on the outer side of the rib limbs of the side rib segment 3 and the middle arch rib segment 4 to ensure that the laser ranging mechanism 1 and the target mechanism 2 are located in the same relative positions in the side rib segment 3 and the middle arch rib segment 4.

[0064] Preferably, a level bubble 24 for leveling is provided on the laser target 23 .

[0065] When adjusting the spacing between the laser targets 23 and the rib centers of the middle arch rib segment 4, in order to ensure that the angles of each laser target 23 relative to the corresponding laser rangefinder 11 are consistent after the middle arch rib segment 4 is lifted, thereby reducing the impact of angle inconsistencies, when installing the target mechanism 2, the middle arch rib segment 4 is first laid flat and the laser targets 23 are leveled using the leveling bubble 24 installed on the laser targets 23. This ensures that all laser targets 23 have consistent angles, thereby reducing the impact of angle inconsistencies on subsequent measurement results.

[0066] like Figure 4As shown, in some optional embodiments, the arch bridge middle arch rib joint construction device also includes: a tensioning jack 5, a lifting mechanism 6 and a central controller (not shown in the figure); the tensioning jack 5 is used to be installed at the end of the middle arch rib segment 4 to tension the two ends of the middle arch rib segment 4; the lifting mechanism 6 is used to lift and adjust the vertical position of the middle arch rib segment 4; the central controller is connected to the tensioning jack 5 and the lifting mechanism 6 by signal, and is used to control the lifting mechanism 6 to lift the height of the middle arch rib segment 4 according to the distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3 measured by the laser rangefinder 11, and to control the tensioning force of the tensioning jack 5 on the two ends of the middle arch rib segment 4.

[0067] In this example, before lifting the middle arch rib segment 4 to its initial position, tensioning jacks 5 are used to tension both ends of the middle arch rib segment 4 to the theoretical tension. This reduces deformation of the middle arch rib segment 4 during lifting. Furthermore, when adjusting the longitudinal spacing between the ends of the middle arch rib segment 4 and the ends of the side rib segments 3, the tensioning force applied to the ends of the middle arch rib segment 4 can be adjusted to adjust the longitudinal position of the ends of the middle arch rib segment 4, ensuring that the ends of the middle arch rib segment 4 are in the theoretical position.

[0068] The lifting mechanism 6 includes two lifting units, which are arranged at intervals along the longitudinal direction of the middle arch rib segment 4. Each lifting unit includes a lifting jack 61 and a lifting frame 62. The lifting jack 61 is installed on the top surface of the lifting frame 62 and is connected to the middle arch rib segment 4 through a sling 63. The lifting jack 61 adjusts the position of the middle arch rib segment 4 by adjusting the length of the sling 63.

[0069] In addition, in this example, the lifting jack 61 is a CNC lifting jack, and the tensioning jack 5 is also a CNC tensioning jack; the data detected by the laser rangefinder 11 is received by the central controller, and based on the detection data, control instructions are issued to the lifting jack 61 and the tensioning jack 5, so as to achieve mutual coordination and synchronous operation of measurement and construction, significantly improve the efficiency of joint construction, and significantly reduce the safety risks of high-altitude measurement and construction.

[0070] On the other hand, the present invention further provides a method for closure of the arch ribs in an arch bridge, which is implemented using any of the above-mentioned devices for closure of the arch ribs in an arch bridge, and comprises the following steps:

[0071] S1: Adjust the angle of the laser emitted by the laser rangefinder 11 installed at the end of the side rib segment 3 at the theoretical position so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment 4 and the theoretical position of the end of the side rib segment 3.

[0072] In this embodiment, step S1 includes:

[0073] S11: Obtain an inclination angle corresponding to a theoretical chord formed by the theoretical position of the end of the middle arch rib segment 4 and the theoretical position of the end of the side rib segment 3.

[0074] In this example, the theoretical chord formed by the theoretical positions of the ends of the rib limbs of the central arch rib segment 4 and the theoretical positions of the ends of the rib limbs of the corresponding side rib segments 3 is the line connecting the theoretical positions of the ends of the rib limbs of the central arch rib segment 4 and the theoretical positions of the ends of the rib limbs of the corresponding side rib segments 3. Obviously, this theoretical chord has a certain inclination angle and can be determined based on the design parameters of the entire arch rib, specifically, based on the theoretical positions of the ends of the rib limbs of the central arch rib segment 4 and the theoretical positions of the ends of the rib limbs of the corresponding side rib segments 3.

[0075] S12: Adjust the angle of the laser emitted by the laser rangefinder 11 installed at the end of the rib limb of the upper rib segment 3 at the theoretical position, and read the detection data of the inclinometer 12 until the angle of the laser corresponds to the inclination angle of the theoretical chord.

[0076] In this embodiment, since the side rib segments 3 are located at both ends of the bridge, installation is facilitated. First, the side rib segments 3 are installed at the theoretical position. At this point, the rib ends of the side rib segments 3 are also at the theoretical position. A laser distance measuring mechanism 1 is installed on the outside of the ribs corresponding to the end centers A1, B1, C1, D1 and A4, B4, C4, D4 of the side rib segments 3 already installed at the theoretical position. Laser distance measuring devices 1 are installed on the outside of the ribs. Laser distance measuring devices 11 are installed using data from an inclinometer 12 installed above the laser distance measuring devices 11. The angle of the laser light emitted by the laser distance measuring devices 1 is adjusted until the angle of the laser light corresponds to the inclination angle of the theoretical chord. A laser distance measuring device 11 is installed on the outside of the rib ends of each side rib segment 3 and adjusted until the emitted laser light corresponds to the inclination angle of the theoretical chord.

[0077] When the middle arch rib segment 4 is lifted to the theoretical position, the chord lines A1 A2, B1B2, C1 C2, D1D2 formed by A1, B1, C1, D1 and A2, B2, C2, D2, and the chord lines A3 A4, B3 B4, C3 C4, D3D4 formed by A4, B4, C4, D4 and A3, B3, C3, D3 should be within the set range with the corresponding theoretical linear errors.

[0078] S2: tensioning the two ends of the middle arch rib segment 4 to the theoretical tension, and lifting the middle arch rib segment 4 to the initial position.

[0079] In some optional embodiments, step S2 includes:

[0080] S21: Install the tensioning jacks 5 at the ends of the middle arch rib segment 4, and tension the two ends of the middle arch rib segment 4 to the theoretical tension.

[0081] In this example, in order to prevent the middle arch rib segment 4 from being deformed when the middle arch rib segment 4 is lifted, a tensioning jack 5 is installed at the end of the middle arch rib segment 4 and tensioning is performed to tighten the middle arch rib segment 4 to the theoretical tension.

[0082] S21: A target mechanism 2 is set at the end of the rib limb of the middle arch rib segment 4.

[0083] In this example, when installing the target mechanism 2, the middle arch rib segment 4 is laid flat, and the placement angles of the laser targets 23 are adjusted so that the placement angles of the laser targets 23 on the same side are consistent.

[0084] In addition, the positions of the laser ranging mechanism 1 and the target mechanism 2 relative to the ribs of the side rib segment 3 and the ribs of the middle arch rib segment 4 correspond, and the distance from the point where the laser rangefinder 11 emits the laser to the center points A1, B1, C1, D1, A4, B4, C4, and D4 of the ribs of the corresponding side rib segment 3 is equal to the distance from the center of the target mechanism 2 to the center points A2, B2, C2, D2, A3, B3, C3, and D3 of the ribs of the corresponding middle arch rib segment 4.

[0085] The positions of the laser ranging mechanism 1 and the target mechanism 2 relative to the ribs of the side rib segment 3 and the ribs of the middle arch rib segment 4 correspond, which means that their radial positions relative to the ribs are the same.

[0086] When the middle arch rib segment 4 is lifted so that the center of the target mechanism 2 receives the laser light emitted by the laser rangefinder 11, the end of the middle arch rib segment 4 is necessarily on the theoretical chord line. At this time, it is only necessary to ensure that the distance (chord length) between the laser rangefinder 11 and the target mechanism 2, that is, the distance between the center point of the end of the middle arch rib segment 4 and the center point of the end of the side rib segment 3, meets the allowable construction error range, and the middle arch rib segment 4 can be considered to have moved to the set position.

[0087] S23: Install the lifting jack 61 on the top surface of the lifting frame 62, and the lifting jack 61 lifts the middle arch rib segment 4 to a set height to the initial position through the sling 63.

[0088] In this example, a lifting jack 61 is installed on the top surface of a lifting frame 62 , and the middle arch rib segment 4 is lifted by a sling 63 . In other embodiments, other methods may be used to lift the middle arch rib segment 4 .

[0089] Raising the middle arch rib segment 4 to the set height to the initial position refers to the height to which the middle arch rib segment 4 should be initially raised, calculated based on the theoretical position. Alternatively, the middle arch rib segment 4 may be raised until the laser targets 23 at both ends can receive the laser light emitted by the laser rangefinder 11, i.e., the ends of the middle arch rib segment 4 are approximately on the theoretical chord line.

[0090] S3: Use the laser rangefinder 11 to measure the distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3, and adjust the tension and height at both ends of the middle arch rib segment 4 so that the distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3 meets the allowable construction error range.

[0091] Preferably, step S3 includes:

[0092] S31: Using the laser rangefinder 11, measure the actual distance between the target mechanism 2 on the end of the middle arch rib segment 4 and the end of the side rib segment 3.

[0093] In this example, if the height of the middle arch rib segment 4 is raised to the initial position calculated based on the theoretical position, if the laser target 23 cannot receive the laser emitted by the laser rangefinder 11, the tension at both ends of the middle arch rib segment 4 is adjusted to change the horizontal position of the two ends of the middle arch rib segment 4, so that the laser target 23 can receive the laser emitted by the laser rangefinder 11.

[0094] Then, the laser rangefinder 11 is used to measure the actual distance between the target mechanism 2 on the end of the middle arch rib segment 4 and the end of the side rib segment 3 to correct the positions of the two ends of the middle arch rib segment 4 .

[0095] S32: Obtain the deviation between the theoretical distance and the actual distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3.

[0096] In this example, the theoretical distance is the length of the chord A1 A2, B1B2, C1 C2, D1D2 formed by the theoretical positions A1, B1, C1, D1 and A2, B2, C2, D2, and the length of the chord A3A4, B3B4, C3C4, D3D4 formed by the theoretical positions A4, B4, C4, D4 and A3, B3, C3, D3, which are determined based on the coordinates of the theoretical positions A1, B1, C1, D1 and A2, B2, C2, D2, and A4, B4, C4, D4 and A3, B3, C3, D3.

[0097] The actual distance measured by each laser rangefinder 11 is the distance between the laser target 23 at the end of the middle arch rib segment 4 and the laser emission point of the laser rangefinder 11 at the end of the side rib segment 3. The difference between the theoretical distance and the corresponding actual distance is the deviation between the theoretical distance and the actual distance between the end of the middle arch rib segment 4 and the end of the side rib segment 3.

[0098] S33: When the longitudinal deviation exceeds the allowable longitudinal deviation and / or the vertical height difference exceeds the allowable vertical height difference, adjust the tensioning force of the tensioning jack 5 and adjust the height of the middle arch rib segment 4 by lifting the jack 61 until the longitudinal deviation is less than the allowable longitudinal deviation and the vertical height difference meets the allowable vertical height difference.

[0099] According to the actual distance measured by the laser rangefinder 11 and the angle at which the laser rangefinder 11 emits the laser, the longitudinal deviation and the vertical height difference of the end of the middle arch rib segment 4 can be calculated.

[0100] In the specific adjustment, it is necessary to adjust the tensioning force of the tensioning jack 5 and adjust the height of the middle arch rib segment 4 by using the lifting jack 61 for coordinated adjustment.

[0101] For example, when the longitudinal deviation of the end of the middle arch rib segment 4 does not meet the allowable longitudinal deviation, the tensioning force of the tensioning jack 5 is first adjusted to make the longitudinal deviation of the end of the middle arch rib segment 4 meet the allowable longitudinal deviation; then the actual distance is obtained by the laser rangefinder 11, and the vertical height difference of the end of the middle arch rib segment 4 is calculated based on the actual distance to determine whether it meets the allowable vertical height difference. The height of the middle arch rib segment 4 is adjusted by the lifting jack 61 to adjust the vertical height difference. Alternatively, the vertical height difference can be adjusted until the longitudinal deviation is less than the allowable longitudinal deviation and the vertical height difference meets the allowable vertical height difference.

[0102] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0103] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0104] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A construction device for closure of arch ribs in an arch bridge, characterized in that: include: A laser distance measuring mechanism (1) is provided at the end of a rib limb of a side rib segment (3) that has been erected at a theoretical position. The laser distance measuring mechanism (1) comprises a laser distance meter (11) and an inclinometer (12). The inclinometer (12) is used to coordinately adjust the angle of laser light emitted by the laser distance meter (11) so that the laser light is parallel to a theoretical chord formed by the theoretical position of the end of the middle arch rib segment (4) and the theoretical position of the end of the side rib segment (3). A target mechanism (2) is provided at the end of the rib limb of the middle arch rib segment (4) and corresponds to the position of the laser distance measuring mechanism (1) to receive the laser emitted by the laser distance measuring instrument (11) and cooperate to adjust the position of the middle arch rib segment (4) to within the construction allowable error range.

2. The arch rib closure construction device for an arch bridge according to claim 1, characterized in that: The laser distance measuring mechanism (1) further comprises: A first magnetic block (13), one side of which is used to mount the laser rangefinder (11), and the other side of which is used to be adsorbed on the outer side of the rib limb of the side rib segment (3); A magnetic gasket (14) is provided between the first magnetic block (13) and the rib limb of the side rib segment (3) to adjust the distance between the laser rangefinder (11) and the center of the rib limb of the side rib segment (3); An adjustment component (15) is used to adjust the tilt angle of the laser rangefinder (11).

3. The arch rib closure construction device for an arch bridge according to claim 1, characterized in that: The target mechanism (2) comprises: A second magnetic block (21) is used for adsorbing on the outer side of the rib of the middle arch rib segment (4); a laser target (23) for receiving the laser light emitted by the laser rangefinder (11); A connecting frame (22) has two ends connected to the second magnetic block (21) and the laser target (23) respectively, and is used to adjust the placement angle of the laser target (23) and the spacing between the centers of the rib limbs of the four intermediate arch rib segments.

4. The arch rib closure construction device for an arch bridge according to claim 3, characterized in that: The connecting frame (22) comprises a first connecting plate (221) and a second connecting plate (222); one end of the first connecting plate (221) is connected to the second magnetic block (21) and is provided with an oblong hole; one end of the second connecting plate (222) is connected to the laser target (23) and is provided with a through hole; the first connecting plate (221) and the second connecting plate (222) are connected by a fastening screw (223) passing through the oblong hole and the through hole.

5. The arch rib closure construction device for an arch bridge according to claim 4, characterized in that: The laser target (23) is provided with a level bubble (24) for leveling.

6. The arch rib closure construction device for an arch bridge according to claim 1, characterized in that: Also includes: A tensioning jack (5) is used to be installed at the end of the middle arch rib segment (4) to tension the two ends of the middle arch rib segment (4); A lifting mechanism (6) for lifting and adjusting the vertical position of the middle arch rib segment (4); A central controller is connected to the tensioning jack (5) and the lifting mechanism (6) by signals, and is used to control the lifting mechanism (6) to lift the height of the middle arch rib segment (4) according to the distance between the end of the middle arch rib segment (4) and the end of the side rib segment (3) measured by the laser rangefinder (11), and to control the tensioning force of the tensioning jack (5) at both ends of the middle arch rib segment (4).

7. A construction method for closure of arch ribs in an arch bridge, characterized in that: The method is implemented using the arch rib closure construction device for an arch bridge according to any one of claims 1 to 6, comprising the following steps: Adjusting the angle of the laser emitted by the laser rangefinder (11) installed at the end of the side rib segment (3) at the theoretical position so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment (4) and the theoretical position of the end of the side rib segment (3); Tensing both ends of the middle arch rib segment (4) to a theoretical tension, and lifting the middle arch rib segment (4) to an initial position; The laser rangefinder (11) is used to measure the distance between the end of the middle arch rib segment (4) and the end of the side rib segment (3), and by adjusting the tensioning force and height at both ends of the middle arch rib segment (4), the distance between the end of the middle arch rib segment (4) and the end of the side rib segment (3) meets the construction allowable error range.

8. The method for closure of the arch ribs in an arch bridge according to claim 7, wherein: The adjustment of the angle of the laser emitted by the laser rangefinder (11) installed at the end of the side rib segment (3) at the theoretical position so that the laser is parallel to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment (4) and the theoretical position of the end of the side rib segment (3) includes: Obtaining the inclination angle corresponding to the theoretical chord formed by the theoretical position of the end of the middle arch rib segment (4) and the theoretical position of the end of the side rib segment (3); The angle of the laser emitted by the laser rangefinder (11) installed at the end of the rib limb of the upper rib segment (3) at the theoretical position is adjusted, and the detection data of the inclinometer (12) is read until the angle of the laser corresponds to the inclination angle of the theoretical chord.

9. The method for closure of the arch rib in an arch bridge according to claim 7, characterized in that: The method of tensioning the two ends of the middle arch rib segment (4) to a theoretical tension and lifting the middle arch rib segment (4) to an initial position includes: Installing a tensioning jack (5) at the end of the middle arch rib segment (4) to tension the two ends of the middle arch rib segment (4) to a theoretical tension; A target mechanism (2) is provided at the end of the rib limb of the middle arch rib segment (4); A lifting jack (61) is installed on the top surface of the lifting frame (62), and the lifting jack (61) lifts the middle arch rib segment (4) to a set height to an initial position through a sling (63).

10. The method for closure of the arch rib in an arch bridge according to claim 9, characterized in that: The method of measuring the distance between the end of the middle arch rib segment (4) and the end of the side rib segment (3) by using the laser rangefinder (11), and adjusting the tension and height at both ends of the middle arch rib segment (4) so ​​that the distance between the end of the middle arch rib segment (4) and the end of the side rib segment (3) meets the construction tolerance range includes: Using a laser rangefinder (11), the actual distance between the target mechanism (2) on the end of the middle arch rib segment (4) and the end of the side rib segment (3) is measured; Obtaining a longitudinal deviation between a theoretical distance and an actual distance between a target mechanism (2) at an end of the middle arch rib segment (4) and an end of the side rib segment (3); When the longitudinal deviation exceeds the allowable longitudinal deviation and / or the vertical height difference exceeds the allowable vertical height difference, the tensioning force of the tensioning jack (5) is adjusted and the height of the middle arch rib segment (4) is adjusted by the lifting jack (61) until the longitudinal deviation is less than the allowable longitudinal deviation and the vertical height difference meets the allowable vertical height difference.

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