Arch rib closure positioning device and using method

Abstract

The invention discloses an arch rib closure positioning device and a using method, the arch rib closure positioning device comprises positioning pieces arranged near four corners of an arch rib, the positioning pieces are provided with positioning holes used for closure positioning, and reinforcing pieces used for preventing the positioning pieces from buckling deformation when the arch rib is closed are arranged between the arch rib and the positioning pieces; according to the arch rib closure positioning device and the using method, the external arch rib closure positioning device is adopted to be assembled in a processing plant, the positioning holes are calibrated through the prisms, danger caused by high-altitude welding is avoided, the construction period is shortened, positioning and alignment can be rapidly conducted through the positioning pieces and the positioning holes in the positioning pieces, and the positioning accuracy of the arch rib closure positioning device is improved. The construction efficiency is effectively improved, long-time night construction is avoided, materials needed by the device are few, the using amount of steel can be saved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of arch bridge closure, and in particular to an arch rib closure positioning device and a use method thereof. Background Art

[0002] With the continuous innovation of construction technology and the continuous improvement of environmental protection requirements, large-span bridges across large reservoirs, navigable rivers, steep canyons, etc. are constantly being used, and steel tube concrete arch bridges are one of the suitable bridge types; in the installation process of steel tube arch bridges with cantilever assembly without brackets, complex structures, and super-heavy construction segments, especially the arch crown joint section structure, joint line shape and stress control are definitely the key to the completion of the steel tube arch bridge.

[0003] In the prior art, the common closure device for steel tube concrete arch bridges first reserves bolt holes on the splicing plates, and after the main arch rib closure section is hoisted, the splicing plates on both sides are positioned and spliced, and punches are driven in and positioning welding is performed using positioning steel plates. However, due to the large amount of welding and long closure time in the traditional closure device, the arch rib is greatly affected by temperature during the construction process, and a long welding time will cause the closure to fail due to linear changes. In addition, the arch rib closure is usually carried out at night. Long-term night construction has a high risk factor, and the construction quality is difficult to guarantee. In addition, the bolts have low precision and are prone to getting stuck.

[0004] Therefore, there is an urgent need to develop an arch rib joint positioning device and a method of use, which can be assembled in advance, avoid high-altitude welding, shorten the construction period, save costs, and at the same time avoid the overall buckling and deformation of the arch rib during jointing. The joint positioning is accurate, which effectively improves the construction efficiency. It can also reduce the construction time during night construction and improve the safety of construction. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an arch rib joint positioning device and a method of use, which can be assembled in advance, avoid high-altitude welding, shorten the construction period, save costs, and at the same time avoid the overall buckling and deformation of the arch rib during jointing. The joint positioning is accurate, effectively improving the construction efficiency, and can also reduce the construction time during night construction and improve the safety of construction.

[0006] The arch rib closure positioning device of the present invention comprises positioning pieces arranged near the four corners of the arch rib, the positioning pieces are provided with positioning holes for closure positioning, and reinforcement pieces are arranged between the arch rib and the positioning pieces to prevent the positioning pieces from buckling and deforming when the arch rib is closed.

[0007] Furthermore, a positioning prism is provided on the positioning hole, and the positioning prism is used to measure the deviation value between the local coordinates of the positioning hole and its design coordinates.

[0008] Furthermore, the arch rib includes a chord tube, a web tube and a cross-connecting tube, and the positioning member is coplanar with the end surface of the chord tube opening and is connected to the chord tube.

[0009] Furthermore, the positioning member is in the shape of an isosceles trapezoid, and an arc groove is formed on one side of the short bottom side of the positioning member. The positioning member is connected to the chord tube via the arc groove, and the oblique edges on both sides of the positioning member extend toward the two nearest chord tubes.

[0010] Furthermore, the reinforcement member includes a plurality of stiffening plates I and II, wherein the stiffening plate I is perpendicular to the positioning member and is arranged on the belly tube and the cross-connecting tube, and the stiffening plate II is perpendicular to the positioning member and is arranged on the chord tube.

[0011] Furthermore, the stiffening plate I is in an isosceles trapezoidal shape and has a semicircular groove on one side of the long bottom side that matches the cross-connecting tube and / or the belly tube. The short bottom side of the stiffening plate I is vertically connected to the positioning piece.

[0012] Furthermore, the stiffening plate II is in the shape of a right-angled trapezoid, one side of the long bottom side of the stiffening plate II is vertically connected to the positioning piece and a quarter-circular groove is opened at the right angle.

[0013] Furthermore, a drainage hole is formed between the quarter-circular groove on the stiffening plate II and the chord tube and the positioning member to prevent water accumulation.

[0014] Furthermore, at least one horizontal support tube is arranged between the web tubes in the arch rib, a rectangular grid is formed between the horizontal support tube and the cross-connecting tube, and an oblique support tube for forming a triangular cross partition is arranged in the rectangular grid.

[0015] The present invention also discloses a method for using the arch rib closure positioning device, which is characterized by comprising the following steps:

[0016] S1. Pre-join the closure sections of the arch ribs in the factory to ensure that the closure device of the processed arch ribs can be accurately aligned. A prism is set on each positioning hole, and the global coordinates of the prism corresponding to each positioning hole are measured by the total station.

[0017] S2. There are multiple chord tube openings on the same end face of the arch rib joint section. The three prism coordinates P corresponding to each chord tube opening are measured multiple times using the total station through the prism corresponding to each positioning hole. oi,j (x ij ,y ij , z ij ) and use the space center fitting algorithm to calculate the center coordinates of multiple chord tube openings O i (x oi ,y oi , z oi ), where symbol i is the chord tube orifice number, and j is the chord tube orifice prism number;

[0018] S3, using multiple chord tube orifice center coordinates O on the same end face i (x oi ,y oi , z oi ) find the common centroid coordinates O0(x o ,y o , z o );

[0019] S4, O0(x o ,y o , z o ) as the coordinate origin, establish a local coordinate system with the plane of the chord tube orifice as the reference plane, and the center coordinates of the multiple chord tube orifices O i (x oi ,y oi , z oi ), any two adjacent sides can obtain a plane normal vector with the common centroid coordinates O0(x o ,y o , z o ) is taken as the origin, and the obtained plane normal vector is used to provide a reference system for the calibration transformation of the locating hole.

[0020] S5. Each positioning hole is accurately laid out and adjusted and fixed according to the designed position, and then the axial distance deviation after the positioning hole calibration conversion is verified. If the axial distance deviation is within the error range, the next step of hoisting and closure is carried out. Otherwise, the spatial position of the positioning hole of the closure device is adjusted;

[0021] S6. After the axial distance deviation of the positioning hole is within the error range, the arch rib line shape on both sides is adjusted before lifting and closure, and the influence of temperature on the line shape is continuously observed with a total station to find the optimal closure temperature;

[0022] S7. When the best closure temperature is reached, the closure section is hoisted to the designated position, and the linear shapes of the arch ribs on both sides are measured again and adjusted. After the adjustment is completed, the closure is ready;

[0023] S8, positioning the positioning pieces in the arch rib closure device on each arch rib relative to each other until the positioning pieces on the multiple chord tubes on both sides are aligned at the same time and the positioning is completed;

[0024] S9. After positioning is completed, use a rotatable instantaneous connecting rod to connect immediately, complete the joint and use a total station to re-measure the arch rib line shape to ensure construction accuracy.

[0025] The beneficial effects of the present invention: the arch rib joint positioning device and the use method of the present invention adopt an external arch rib joint positioning device to be assembled in a processing plant and use a prism to calibrate the positioning holes, thereby avoiding the danger brought by high-altitude welding and shortening the construction period. The positioning and alignment can be quickly performed through the positioning parts and the positioning holes on the positioning parts, effectively improving the construction efficiency and avoiding long-term night construction. The device requires less materials, can save the use of steel and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the elevation structure of the present invention;

[0030] Figure 3 It is a schematic diagram of a positioning member of the present invention;

[0031] Figure 4 It is a schematic diagram of the stiffening plate I of the present invention;

[0032] Figure 5 It is a schematic diagram of the stiffening plate II of the present invention;

[0033] Figure 6 This is a schematic diagram of the installation of the positioning prism of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection of the positioning plate of the present invention;

[0035] Figure 8 It is a coordinate point schematic diagram of the present invention;

[0036] Fig. 9 It is a schematic diagram of the use process of the present invention.

[0037] Numbers in the figure: 1, chord tube; 2, belly tube; 3, cross-connecting tube; 4, positioning piece; 401, arc groove; 5, positioning hole; 501, bolt; 6, stiffening plate I; 601, semicircular groove; 7, stiffening plate II; 701, quarter-circular groove; 8, positioning prism; 9, positioning rod; 10, horizontal support tube; 11, oblique support tube DETAILED DESCRIPTION

[0038] Figure 1 is a schematic diagram of the cross-sectional structure of the present invention, Figure 2 It is a schematic diagram of the elevation structure of the present invention. Figure 3 is a schematic diagram of a positioning member of the present invention, Figure 4 It is a schematic diagram of the stiffening plate I of the present invention; Figure 5is a schematic diagram of the stiffening plate II of the present invention, Figure 6 is a schematic diagram of the prism installation of the present invention, Figure 7 This is a schematic diagram of the connection of the positioning plate of the present invention. Figure 8 is a coordinate point schematic diagram of the present invention, Fig. 9 The present invention is a schematic diagram of the use process of the present invention, as shown in the figure: the arch rib joint positioning device of this embodiment includes positioning members 4 arranged near the four corners of the arch rib, and the positioning members 4 are provided with positioning holes 5 for joint positioning, and reinforcement members are provided between the arch rib and the positioning members 4 to prevent the positioning members 4 from buckling and deforming when the arch rib is jointed; arch rib jointing is an important stage in the construction of arch bridges, which refers to the precise docking and fixing of the two ends of the arch ribs of the arch bridge to form a complete arch structure. This process usually involves high-precision measurement and adjustment to ensure the precise docking of the arch ribs and the stability of the structure; buckling deformation refers to a sudden and rapid deformation of a structure or material under a specific load, causing it to lose its original stability and bearing capacity.

[0039] In this embodiment, a positioning prism 8 is provided on the positioning hole 5, and the positioning prism 8 is used to measure the deviation between the local coordinates of the positioning hole 5 and its design coordinates; the positioning prism 8 is usually used in conjunction with a total station during measurement, and the total station is a measuring device that integrates angle measurement and distance measurement, and can directly measure the three-dimensional coordinates of the target point. During the measurement process, the positioning prism 8 is placed on the point to be measured as a reflective target, and the total station determines the position of the positioning prism 8 by transmitting and receiving signals, thereby obtaining the coordinates of the point to be measured. The measurement process of the positioning prism 8 is described in detail in the following method of use.

[0040] In this embodiment, the arch rib includes a chord tube 1, a belly tube 2 and a cross-connecting tube 3. The positioning member 4 is coplanar with the end face of the tube mouth of the chord tube 1 and is connected to the chord tube 1. The arch rib is the main load-bearing structure of the arch bridge. Its design needs to meet the strength and stability requirements in the lifting stage, and also meet the strength requirements under the load at each stage in the assembly process. The arch rib usually includes a chord tube 1, a belly tube 2 and a cross-connecting tube 3. The chord tube 1 is the main longitudinal load-bearing member in the arch rib, and usually adopts a steel tube concrete structure with high strength and rigidity. The steel tube concrete chord 1 is a thin-walled circular steel tube filled with concrete. The stability of the steel tube wall is enhanced by the inner filling concrete. At the same time, the steel tube uses the hooping effect on the core concrete to make the core concrete in a three-way compression state, so that it has higher compressive strength and deformation resistance. The belly tube 2 is a transverse connecting member in the arch rib. It connects the chord 1 to enhance the overall stability and lateral stiffness of the arch rib. The belly tube 2 is usually also made of steel tubes, and together with the chord 1, it constitutes the spatial truss structure of the arch rib. The cross-connecting tube 3 is a transverse member connecting the chord 1 on both sides of the arch rib. They are usually arranged perpendicular to the chord 1 to enhance the lateral stiffness and out-of-plane stability of the arch rib. The cross-connecting tube 3 is connected to the chord 1 by welding or bolting to form a strong transverse connection; such as Figure 7 As shown, the positioning member 4 is coplanar with the end surface of the tube opening of the chord tube 1, which can ensure that the positioning members 4 can face each other when the arch rib is closed.

[0041] In this embodiment, the positioning member 4 is in an isosceles trapezoidal shape, and an arc groove 401 is formed on one side of the short bottom side of the positioning member 4. The positioning member 4 is connected to the chord tube 1 through the arc groove 401, and the oblique sides of the positioning member 4 extend toward the two nearest chord tubes 1. The curvature of the arc groove 401 is consistent with the curvature of the outer surface of the chord tube 1. The arc groove 401 and the chord tube 1 can be connected by welding, or other connection methods can be used, which will not be repeated here.

[0042] In this embodiment, the reinforcement member includes a plurality of stiffening plates I6 and stiffening plates II7, wherein the stiffening plates I6 are perpendicular to the positioning members 4 and are arranged on the belly tube 2 and the cross-connecting tube 3, and the stiffening plates II7 are perpendicular to the positioning members 4 and are arranged on the chord tube 1; Figure 1 As shown, the number of stiffening plates I6 and II7 is determined according to the overall size of the positioning plate and the arch rib.

[0043] In this embodiment, the isosceles trapezoid is in the shape of an isosceles trapezoid and has a semicircular groove 601 on one side of the long bottom side that matches the cross-connecting tube 3 or / and the belly tube 2. The short bottom side of the stiffening plate Ⅰ6 is vertically connected to the positioning member 4. The stiffening plate Ⅰ6 is in the shape of an isosceles trapezoid. Due to its cross-sectional characteristics, it can effectively improve the torsional rigidity of the structure and enhance the moment of inertia of the section, thereby enhancing the overall stability and the overall average failure stress of the structure. The isosceles trapezoid stiffening plate Ⅰ6 can also improve the stress distribution of the overall structure, increase the bending rigidity of the overall structure, and provide sufficient strength and rigidity without adding too much weight, thereby reducing the use of materials and achieving economy.

[0044] In this embodiment, the stiffening plate II 7 is in the shape of a right-angled trapezoid, one side of the long bottom side of the stiffening plate II 7 is vertically connected to the positioning member 4 and a quarter-circular groove 701 is opened at the right angle; the quarter-circular groove 701 on the stiffening plate II 7 forms a drainage hole between the chord tube 1 and the positioning member 4 to prevent water accumulation; the beneficial effects of the stiffening plate II 7 in the shape of a right-angled trapezoid are the same as those of the stiffening plate I 6 in the middle waist trapezoid mentioned above, which will not be repeated here; the main function of the drainage hole is to drain the accumulated water and prevent water from accumulating on the surface or inside the structure, thereby avoiding structural damage caused by water accumulation, reducing the erosion of the material by corrosive liquids, and extending the service life of the structure.

[0045] In this embodiment, a positioning rod 9 is also included. After the positioning member 4 is positioned and aligned with the arch rib, the positioning rod 9 is inserted into the positioning hole 5 on the positioning member 4 to complete the closure of the arch rib; Figure 7 As shown, after the positioning rod 9 is inserted into the positioning hole 5, it can be fixed by a bolt 502, or other mechanical fixing methods can be used, which will not be described in detail here.

[0046] In this embodiment, at least one horizontal support tube 10 is arranged between the web tubes 2 in the arch rib, and a rectangular grid is formed between the horizontal support tube 10 and the cross-connecting tube 3, and an oblique support tube 11 for forming a triangular cross partition is arranged in the rectangular grid; the rectangular grid structure formed by the horizontal support tube 10 and the cross-connecting tube 3 increases the lateral stiffness and stability of the arch rib, which is particularly important for bearing lateral loads and wind loads. The triangular cross partition formed by the oblique support tube 11 increases the overall stiffness of the structure, making the arch rib more stable when bearing loads and reducing deformation. The triangular cross partition can more effectively disperse the load to the entire arch rib structure, reduce local stress concentration, and improve the uniform stress performance of the structure. By adding the oblique support tube 11, the safety reserve of the structure can be increased without adding too much weight, and the performance of the structure under extreme loads can be enhanced. The stable structure formed by the oblique support tube 11 and the cross-connecting tube 3 helps to reduce vibrations caused by wind vibration or traffic loads, improve driving comfort and structural durability, and the design of the rectangular grid and the triangular cross partition makes assembly and welding during construction more convenient, which helps to improve construction efficiency and quality.

[0047] The present invention also discloses a method for using the arch rib closure positioning device, which is characterized by comprising the following steps:

[0048] S1. Pre-join the closure sections of the arch ribs in the factory to ensure that the closure device of the arch ribs after processing can be accurately aligned. A positioning prism 8 is set on each positioning hole 5, and the global coordinates of the positioning prism 8 corresponding to each positioning hole 5 are measured by a total station.

[0049] S2. There are multiple chord tube 1 openings on the same end face of the arch rib joint section. The three prism coordinates P corresponding to each chord tube 1 opening are measured multiple times by using the positioning prism 8 corresponding to each positioning hole 5 using the total station. oi,j (x ij ,y ij , z ij ) and use the space center fitting algorithm to calculate the center coordinates of multiple chord tubes 1 i (x oi ,y oi , z oi ), where symbol i is the tube opening number of string tube 1, and j is the prism number of the tube opening of string tube 1;

[0050] S3, using multiple chord tubes 1 on the same end face. i (x oi ,y oi , z oi ) Find the common centroid coordinates O0(x o ,y o , z o );

[0051] S4, O0(x o ,y o , z o ) as the coordinate origin, establish a local coordinate system with the plane of the chord tube 1 nozzle as the reference plane, and the center coordinates of the multiple chord tube 1 nozzles O i (x oi ,y oi , z oi ), any two adjacent sides can obtain a plane normal vector with the common centroid coordinates O0(x o ,y o , z o ) is taken as the origin, and the obtained plane normal vector is used to provide a reference system for the calibration transformation of the positioning hole 5.

[0052] S5, accurately lay out and adjust and fix each positioning hole 5 according to the designed position, then verify the axial distance deviation of the positioning hole 5 after calibration conversion, if the axial distance deviation is within the error range, proceed to the next step of hoisting and closure, otherwise adjust the spatial position of the closure device positioning hole 5;

[0053] S6. After the axial distance deviation of the positioning hole 5 is within the error range, the arch rib line shape on both sides is adjusted before lifting and closing, and the influence of temperature on the line shape is continuously observed with a total station to find the optimal closing temperature;

[0054] S7. When the best closure temperature is reached, the closure section is hoisted to the designated position, and the linear shapes of the arch ribs on both sides are measured again and adjusted. After the adjustment is completed, the closure is ready;

[0055] S8, positioning the positioning members 4 in the arch rib joint positioning device on each arch rib, until the positioning members 4 on the multiple chord tubes 1 on both sides are aligned at the same time and the positioning is completed;

[0056] S9. After positioning is completed, the rotatable instantaneous positioning rod 9 is used to connect immediately, the joint is completed and the arch rib linear shape is re-measured using a total station to ensure construction accuracy.

[0057] In this embodiment, the detailed local coordinate measurement process of the positioning hole 5 is as follows:

[0058] S1. Pre-join the closure sections of the arch ribs in the factory to ensure that the closure devices of the arch ribs can be accurately aligned after processing;

[0059] S2. Measure the three prism coordinates P corresponding to the opening of each chord tube 1 in the joint section. oi,j (x ij ,y ij , z ij ) to obtain the center coordinates O of the nozzle i (x oi ,y oi , z oi ), where symbol i is the tube opening number of chord tube 1, and j is the prism number of the tube opening of chord tube 1.

[0060] S3, the three prism coordinates P corresponding to the mouth of string tube 1 oi,1 , P oi,2 , P oi,3 Substitute into formula I and use the space circle center fitting algorithm to calculate the center of the pipe mouth O i Coordinate (x oi ,y oi , z oi ), Formula I is as follows:

[0061]

[0062] Among them, x ij ,y ij 、z ij represents the x, y, and z coordinates of the center of the jth prism on the mouth of the i-th chord tube 1, R irepresents the sum of the radius of the i-th chord tube 1 opening and the center height of the prism. For each chord tube 1 opening, the least square method is used to solve Formula I to calculate the coordinates of the opening center (x oi ,y oi , z oi ).

[0063] S4. A positioning prism 8 is set on each of the positioning holes, with four at each end, which are respectively denoted as P1 (x1, y1, z1), P2 (x2, y2, z2), P3 (x3, y3, z3), and P4 (x4, y4, z4).

[0064] S5. Any three of the coordinates of the center of the four chord tubes 1 at the same end can determine a plane

[0065] Select any three center coordinates O of the nozzles at the same end i Determine the prism plane and set the coordinates of any three circle centers selected i Substitute it into formula II to calculate the prism plane. Formula II is as follows:

[0066] a1x+b1y+c1z+d1=0

[0067] in:

[0068] a1=(y o2 -y o1 )(z o3 -z o1 )-(y o3 -y o1 )(z o2 -z o1 )

[0069] b1=(z o2 -z o1 )(x o3 -x o1 )-(z o3 -z o1 )(x o2 -x o1 )

[0070] c1=(x 02 -x 01 )(y 03 -y 01 )-(x 03 -x 01 )(y 02 -y 01 )

[0071] d1=-(ax o1 +by o1 +cz o1 )

[0072] Similarly, using any other three center points, we can get the corresponding plane equation coefficients, such as (x O1 ,y O1 ,z O1 )、(x O2 ,y O2 ,z O2 )、(x O4 ,y O4 ,z O4 ) to obtain a2, b2, c2, d2; substitute into (x O2 ,y O2 ,z O2 )、(x O3 ,y O3 ,z O3 )、(x O4 ,y O4 ,z O4 ) to obtain a3, b3, c3, d3; substitute into (x O1 ,y O1 ,z O1 )、(x O3 ,y O3 ,z O3 )、(x O4 ,y O4 ,z O4 ) to get a4, b4, c4, d4

[0073] In order to eliminate errors, the average value of the above coefficients is taken as the final representative value of the coefficient:

[0074]

[0075]

[0076]

[0077]

[0078] Finally, the prism plane of the joint closing device is calculated:

[0079] ax+by+cz+d=0

[0080] Find the coordinates of the common centroid O0 of the four nozzle circles (x o ,y o , z o )

[0081]

[0082] Next, with O0(x o ,y o , z o) is the origin of the coordinate system, and a local coordinate system with the port plane as the reference plane is established. According to any two adjacent sides of the quadrilateral O1O2O3O4, an end face normal vector can be obtained. In order to eliminate the manufacturing error, the average vector of the four normal vectors is obtained using formula III As the nominal normal vector of the end face, that is, the X-axis direction vector of the local coordinate system, Formula III is as follows:

[0083]

[0084] Y-axis direction vector of the local coordinate system pass and The average vector is obtained by and Cross product Right now:

[0085]

[0086] Therefore, taking the common centroid O0 of the four nozzle circles as the origin, the vector is the X-axis, vector is the Y axis, vector Establish the local coordinate system of the port plane for the Z axis, providing a reference system for the calibration transformation of the positioning holes

[0087] Furthermore, in order to align the positioning holes on the positioning parts between the segments one by one, each positioning hole must be accurately laid out and adjusted and fixed according to the designed position. Then the axial distance deviation ΔLk is verified. If it is within the error range, the next step of hoisting and closure is carried out; otherwise, the spatial position of the closure device positioning hole is adjusted according to the following steps:

[0088] Before adjusting the position of the joint closing device, the global coordinates of the positioning hole positioning prism 8 are determined according to the measured positioning hole, and its local coordinates are obtained using formula IV, and the spatial position deviation ΔX of the kth positioning hole is calculated. k , ΔY k , ΔZ k , Formula IV is as follows:

[0089]

[0090] Where k is the L prism number, X, Y, Z are local coordinates, and x, y, z are measured global coordinates. The coordinate transformation matrix T is calculated using formula V, which is as follows:

[0091]

[0092] Where k is the L prism number, is the direction vector of the local coordinate system axis, (X O1 ,Y O1 ,ZO1 ) is the global coordinate of the center O1.

[0093]

[0094] X k , Y k , Z k are the measured values ​​of the local coordinates of the kth positioning hole from the segment end surface; X 0k , Y 0k , Z 0k are the design values ​​of the local coordinates of the kth positioning hole from the segment end face, and then the spatial position deviation ΔX is verified. k , ΔY k , ΔZ k If they are all within the allowable range, the installation is completed; otherwise, the corresponding jointing device is readjusted.

[0095] The arch rib joint positioning device and use method of the present invention adopts an external arch rib joint positioning device to be assembled in a processing plant and uses a prism to calibrate the positioning hole 5, thereby avoiding the danger brought by high-altitude welding and shortening the construction period. The positioning member 4 and the positioning hole 5 on the positioning member 4 can be quickly positioned and aligned, effectively improving the construction efficiency and avoiding long-term night construction. The device requires less materials, can save the use of steel, and reduce costs.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An arch rib closure positioning device, characterized in that: It comprises positioning pieces arranged near the four corners of the arch rib, the positioning pieces are provided with positioning holes for closure positioning, and reinforcing pieces are arranged between the arch rib and the positioning pieces to prevent the positioning pieces from buckling and deforming when the arch rib is closed.

2. The arch rib closure positioning device according to claim 1, characterized in that: A positioning prism is provided on the positioning hole, and the positioning prism is used to measure the deviation value between the local coordinates of the positioning hole and the design coordinates thereof.

3. The arch rib closure positioning device according to claim 1, characterized in that: The arch rib comprises a chord tube, a belly tube and a cross-connecting tube, and the positioning member is coplanar with the end surface of the chord tube opening and is connected to the chord tube.

4. The arch rib closure positioning device according to claim 3, characterized in that: The positioning piece is in an isosceles trapezoidal shape, and an arc groove is formed on one side of the short bottom side of the positioning piece. The positioning piece is connected to the chord tube through the arc groove, and the oblique sides of the positioning piece extend toward the two nearest chord tubes.

5. The arch rib closure positioning device according to claim 1, characterized in that: The reinforcement member includes a plurality of stiffening plates I and II. The stiffening plates I are perpendicular to the positioning members and are arranged on the belly tube and the cross-connecting tube, and the stiffening plates II are perpendicular to the positioning members and are arranged on the chord tube.

6. The arch rib closure positioning device according to claim 5, characterized in that: The stiffening plate I is in an isosceles trapezoidal shape and has a semicircular groove on one side of the long bottom side that matches the cross-connecting tube and / or the belly tube. One side of the short bottom side of the stiffening plate I is vertically connected to the positioning piece.

7. The arch rib closure positioning device according to claim 5, characterized in that: The stiffening plate II is in the shape of a right-angled trapezoid, one side of the long bottom side of the stiffening plate II is vertically connected to the positioning piece and a quarter-circular groove is opened at the right angle, and a drainage hole is formed between the quarter-circular groove on the stiffening plate II and the chord tube and the positioning piece to prevent water accumulation.

8. The arch rib closure positioning device according to claim 1, characterized in that: It also includes a positioning rod. After the positioning piece is positioned and aligned with the arch rib, the positioning rod is inserted into the positioning hole on the positioning piece to complete the closure of the arch rib.

9. The arch rib closure positioning device according to claim 3, characterized in that: At least one horizontal support tube is arranged between the web tubes in the arch rib, a rectangular grid is formed between the horizontal support tube and the cross-connecting tube, and an oblique support tube for forming a triangular cross partition is arranged in the rectangular grid.

10. A method for using the arch rib closure positioning device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Pre-join the closure sections of the arch ribs in the factory to ensure that the closure device of the processed arch ribs can be accurately aligned. A prism is set on each positioning hole, and the global coordinates of the prism corresponding to each positioning hole are measured by the total station. S2. There are multiple chord tube openings on the same end face of the arch rib joint section. The three prism coordinates P corresponding to each chord tube opening are measured multiple times using the total station through the prism corresponding to each positioning hole. oi,j (x ij ,y ij , z ij ) and use the space center fitting algorithm to calculate the center coordinates of multiple chord tube openings O i (x oi ,y oi , z oi ), where symbol i is the chord tube orifice number, and j is the chord tube orifice prism number; S3, using multiple chord tube orifice center coordinates O on the same end face i (x oi ,y oi , z oi ) find the common centroid coordinates O0(x o ,y o , z o ); S4, O0(x o ,y o , z o ) as the coordinate origin, establish a local coordinate system with the plane of the chord tube orifice as the reference plane, and the center coordinates of the multiple chord tube orifices O i (x oi ,y oi , z oi ), any two adjacent sides can obtain a plane normal vector with the common centroid coordinates O0(x o ,y o , z o ) is taken as the origin, and the obtained plane normal vector is used to provide a reference system for the calibration transformation of the locating hole. S5. Each positioning hole is accurately laid out and adjusted and fixed according to the designed position, and then the axial distance deviation after the positioning hole calibration conversion is verified. If the axial distance deviation is within the error range, the next step of hoisting and closure is carried out. Otherwise, the spatial position of the positioning hole of the closure device is adjusted; S6. After the axial distance deviation of the positioning hole is within the error range, the arch rib line shape on both sides is adjusted before lifting and closure, and the influence of temperature on the line shape is continuously observed with a total station to find the optimal closure temperature; S7. When the best closure temperature is reached, the closure section is hoisted to the designated position, and the linear shapes of the arch ribs on both sides are measured again and adjusted. After the adjustment is completed, the closure is ready; S8, positioning the positioning pieces in the arch rib joint positioning device on each arch rib relative to each other until the positioning pieces on the multiple chord tubes on both sides are aligned at the same time and the positioning is completed; S9. After positioning is completed, use a rotatable instantaneous connecting rod to connect immediately, complete the joint and use a total station to re-measure the arch rib line shape to ensure construction accuracy.

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