Integral positioning construction method for arch foot embedded section of arch bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to an integral positioning construction method for an arch foot embedded section of an arch bridge, which realizes the adjustment of the number of supporting points in the positioning adjustment process by repeatedly connecting connecting plates in the positioning installation process and then timely releasing and recovering the connection of the connecting plates. Point positions playing a limiting role in the positioning and adjusting process are effectively reduced, so that the positioning and adjusting process of each rod piece and the whole truss structure is not excessively restrained, the positioning and mounting precision and efficiency can be improved, the stability of the whole positioning and mounting process of the arch bridge arch foot embedded section is ensured, and meanwhile, the positioning and mounting efficiency is improved. Through linkage of the measuring system, the regulation and control system and the adjusting mechanism, automatic adjustment of the adjusting mechanism is achieved, automatic positioning construction is achieved, the requirement for operators can be reduced, mutual interference and constraint in all the adjusting processes are further avoided, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to an overall positioning construction method for a pre-embedded section of an arch foot of an arch bridge. Background Art

[0002] The positioning accuracy of the embedded section of the arch foot of a steel truss arch bridge plays a key role in the installation accuracy of the entire bridge. At present, there are two main positioning methods for the embedded section of the arch foot of a steel truss arch bridge: single-rod positioning and overall truss positioning. Among them, the single-rod positioning method mainly adopts the method of independently positioning and installing the embedded sections of each chord of the arch rib to ensure the installation positioning coordinates of each embedded section of the chord; and the overall truss positioning method mainly adopts the method of connecting the embedded sections of each chord of the arch rib into an overall truss for positioning and installation. In addition to the installation positioning coordinates of each embedded section of the chord, this method can also ensure the positioning accuracy of the coordinate position relationship between the embedded sections of each chord.

[0003] However, the existing single-rod positioning method and overall truss positioning method both manually measure the installation coordinates, compare them with the positioning coordinates, and then manually adjust the positioning according to the coordinate deviation. The positioning construction process is cumbersome and requires high experience and coordination of the operators. Especially for the overall truss positioning, since the chords are connected as one, there are many supporting points and there are many constraints on the overall truss. When the coordinate of a certain point is adjusted, the coordinates of other points will also change accordingly, and even the supporting points will be constrained from each other, resulting in the situation that the coordinate adjustment measures of other positioning points or the support measures limit the displacement of the current point, resulting in greater difficulty in adjustment, cumbersome steps, and the adjustment effect does not achieve the expected goal. Therefore, it is often necessary to make adjustments repeatedly and multiple times, and the adjustment workload is large, cumbersome, and time-consuming, which affects the construction efficiency and positioning accuracy. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing overall truss positioning method in the prior art, which is labor-intensive, cumbersome and time-consuming to adjust, affecting construction efficiency and positioning accuracy, and to provide an overall positioning construction method for the embedded section of the arch foot of an arch bridge.

[0005] A method for integrally positioning and constructing a pre-embedded section of an arch foot of an arch bridge comprises the following steps: S1. Install a support mechanism, and set an adjustment mechanism on the support mechanism, wherein the support mechanism includes a pre-embedded section support frame and a node bracket; S2, cooperate with the adjustment mechanism to sequentially position and install the arch foot embedded section and the lower chord rod, and connect the lower chord rod and the arch foot embedded section; S3, using a connecting plate to connect the pre-embedded section of the arch foot and the pre-embedded section support frame, using a connecting plate to connect the lower chord and the node bracket, and releasing the contact between the adjustment mechanism and the pre-embedded section of the arch foot; S4. Assemble in a prescribed order to form the truss structure of the starting section of the arch rib; S5, releasing the connection of the connection plate in S3; S6. Cooperate with the measuring system, control system and regulating mechanism to automatically adjust the truss structure until the positioning coordinates meet the requirements, and then restore the connection plate to fix.

[0006] The present invention provides an overall positioning construction method for the embedded section of the arch foot of an arch bridge, which realizes the precise positioning and installation of the embedded section of the arch foot and the lower chord through the cooperation of various supporting mechanisms and adjusting mechanisms, and provides a stable structural foundation for the overall assembly of the truss structure through stable constraints through connecting plates, so that the assembly accuracy of the truss structure is relatively high, and then the number of supporting points is adjusted by disconnecting and releasing the connecting plates, effectively reducing the supporting points that play a limiting role in the overall positioning and adjustment process of the truss structure, so that the overall positioning and adjustment process of the truss structure has only four supporting points, will not be subject to excessive constraints, and can improve the overall positioning and installation accuracy and efficiency of the embedded section of the arch foot of the arch bridge. At the same time, the automatic adjustment of the adjusting mechanism can be realized through the linkage of the measuring system, the control system and the adjusting mechanism, which can reduce the requirements for operating personnel, further avoid mutual interference and constraints of various adjustment processes, and improve construction efficiency.

[0007] Preferably, in step S1, the embedded section support frame includes an upper chord front end support frame, an upper chord rear end support frame, a lower chord front end support frame and a lower chord rear end support frame; the upper chord rear end support frame at least supports the axial end face of the upper chord arch foot embedded section, the upper chord front end support frame and the upper chord rear end support frame are arranged side by side and arranged below the upper chord arch foot embedded section; the lower chord rear end support frame at least supports the axial end face of the lower chord arch foot embedded section, the lower chord front end support frame is arranged below the lower chord arch foot embedded section and is located on the side of the lower chord rear end support frame close to the arch rib center; the node support is supported at the lower chord node between the arch ribs; the node support, the upper chord rear end support frame, the upper chord front end support frame, the lower chord rear end support frame and the lower chord front end support frame are respectively provided with adjustment mechanisms. Multiple support points are formed for the truss structure, and the structural force during the arch rib assembly process acts vertically on the upper chord rear end support frame and the lower chord rear end support frame along the axial direction of the arch rib, ensuring the overall assembly process stability of the arch foot embedded section and the arch rib starting section.

[0008] Preferably, an upper chord front end support frame and an upper chord rear end support frame are arranged side by side on the first bottom plane of the reserved groove of the arch seat, and a lower chord rear end support frame is arranged on the second bottom plane of the reserved groove of the arch seat, and the first bottom plane is higher than the second bottom plane; a node bracket is arranged on the support plane outside the reserved groove of the arch seat.

[0009] Preferably, the adjustment mechanism includes a three-way jack and / or a plurality of one-way jacks.

[0010] Preferably, three-way jacks are respectively arranged on the node bracket and the front-end support bracket of the upper chord, and a number of one-way jacks are respectively arranged on the front-end support bracket of the lower chord, the rear-end support bracket of the upper chord, and the rear-end support bracket of the lower chord. According to the characteristics and stress conditions of the truss structure, arranging the three-way jacks at the front-end support bracket of the upper chord and the node bracket can achieve stable support of the truss structure during the overall positioning and adjustment of the truss structure.

[0011] Preferably, the front-end support bracket of the lower chord is provided with a number of cross-bridge one-way jacks and a number of elevation-direction one-way jacks; the rear-end support bracket of the upper chord and the rear-end support bracket of the lower chord are respectively provided with a number of cross-bridge one-way jacks, a number of mileage-direction one-way jacks, and a number of elevation-direction one-way jacks. To achieve stable and precise adjustment of multiple degrees of freedom of the arch-foot embedded section.

[0012] Preferably, in step S2, through a number of one-way jacks respectively arranged on the rear-end support bracket of the upper chord, the front-end support bracket of the lower chord, and the rear-end support bracket of the lower chord, and the three-way jack arranged on the front-end support bracket of the upper chord, assist in the synchronous positioning and installation of the arch-foot embedded sections on the upstream and downstream of the arch rib; then through the three-way jack arranged on the node bracket, assist in the synchronous positioning and installation of the lower chord members on the upstream and downstream of the arch rib. To respectively ensure the precise positioning and installation of the arch-foot embedded section and the lower chord member, and provide a stable and precise installation foundation for the subsequent assembly of the overall truss.

[0013] Preferably, in step S4, the specified order includes sequentially assembling in the order of the lower chord lateral bracing, the web members, the upper chord members, and the upper chord lateral bracing to form a truss structure. The structure assembled and fixed first provides support for the structure assembled and fixed later, so that the stability of the structure and a high positioning and installation accuracy can be guaranteed at each stage of the overall assembly process of the truss structure.

[0014] Preferably, in step S6, keep the one-way jacks disconnected from the truss structure, and perform the positioning and adjustment of the truss structure through the three-way jacks arranged on the node bracket and the front-end support bracket of the upper chord. To minimize the number of support points during the overall positioning and adjustment of the truss structure and avoid imposing constraints on the overall positioning and adjustment process of the truss structure.

[0015] Preferably, in step S6, the adjustment mechanism is connected to the pump station; the measurement system includes a coordinate measuring instrument; the control system includes a signal transmission device and a visualization operation interface, and the control system is respectively signal-connected to the pump station and the coordinate measuring instrument. The control system analyzes the deviation between the actual measurement value and the theoretical value of the coordinate parameters or the spatial position and shape obtained by the measurement system through algorithm software, determines the displacement adjustment amount of the adjustment mechanism, and then controls the jacks to cooperate in lifting and contracting operations through the pump station to achieve automatic positioning and adjustment, reduce the difficulty of positioning and adjustment, and further improve the adjustment efficiency and positioning quality.

[0016] Compared with the prior art, the beneficial effects of the present invention: 1. The present invention provides a construction method for the overall positioning of the embedded section at the arch foot of an arch bridge. Through the cooperation of each support mechanism and adjustment mechanism, the precise assembly of the embedded section at the arch foot and the lower chord is achieved. Then, through the stable constraint of the connecting plate, a stable structural foundation is provided for the assembly of the truss structure, enabling a relatively high assembly accuracy of the truss structure. 2. The present invention provides a construction method for the overall positioning of the embedded section at the arch foot of an arch bridge. By releasing and then restoring the connection of the connecting plate during the positioning and installation process, the adjustment of the number of support points is realized, effectively reducing the points that play a restrictive role during the overall positioning adjustment of the truss structure. The overall positioning adjustment process of the truss structure is carried out only under the support of four support points, without being overly restricted, which can improve the positioning and installation accuracy and efficiency, and ensure the stability of the overall positioning and installation process of the embedded section at the arch foot of the arch bridge. 3. The present invention provides a construction method for the overall positioning of the embedded section at the arch foot of an arch bridge. Through the linkage of the measurement system, regulation system, and adjustment mechanism, the automatic adjustment of the adjustment mechanism is realized, achieving the overall automatic positioning of the embedded section at the arch foot of the arch bridge. This can reduce the requirements for operators and avoid the mutual interference and constraint of each adjustment process, improving the construction adjustment accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic flow chart of a construction method for the overall positioning of the embedded section at the arch foot of an arch bridge according to the present invention; Figure 2 is a schematic structural diagram of the construction process of the overall positioning of the embedded section for a certain mid - supported steel truss arch bridge in Embodiment 1; Figure 3 is a schematic installation structure diagram of the front upper - chord support frame and the rear upper - chord support frame in Embodiment 1; Figure 4 is Figure 3 a schematic structural diagram of the A - A cross - section in Figure 5 is Figure 3 a schematic structural diagram of the B - B cross - section in Figure 6 is a schematic installation structure diagram of the front lower - chord support frame and the rear lower - chord support frame in Embodiment 1; Figure 7 is Figure 6 a schematic structural diagram of the C - C cross - section in Figure 8 is Figure 6 a schematic structural diagram of the D - D cross - section in Reference numerals in the drawings: 1 - joint support, 2 - front upper - chord support frame, 3 - rear upper - chord support frame, 4 - front lower - chord support frame, 5 - rear lower - chord support frame, 6 - adjustment mechanism, 61 - three - way jack, 62 - one - way jack, 7 - connecting plate; 81 - Arch foot embedded section, 82 - Lower chord, 83 - Web member, 84 - Upper chord; 9 - Arch seat reserved notch, 91 - First bottom plane, 92 - Second bottom plane, 93 - Inclined plane, 94 - Support plane. Specific implementation manner

[0018] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0019] In the description of the specific embodiments of the present invention without special instructions, the expression terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invention product / device / device is usually used. These terms of orientation or position relationship are only for facilitating the description of the present invention solution or simplifying the description in specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship. Therefore, it should not be construed as a limitation to the present invention.

[0020] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention solution.

[0021] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0022] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0023] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, when the terms "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they 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 connection means commonly used in the art such as welding, riveting, bolting, or threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0024] Embodiment 1 As Figures 1-8 shown, a construction method for the overall positioning of the embedded section at the arch foot of an arch bridge includes the following steps: S1. Install the support mechanism, and set the adjustment mechanism 6 on the support mechanism. The support mechanism includes the embedded section support frame and the node support 1.

[0025] In one or several embodiments, the arch foot embedded section 81 in this embodiment includes the arch foot embedded section 81 at the upper chord position and the arch foot embedded section 81 at the lower chord position. The embedded section support frame may include the front support frame 2 at the upper chord, the rear support frame 3 at the upper chord, the front support frame 4 at the lower chord, and the rear support frame 5 at the lower chord; the rear support frame 3 at the upper chord supports at least the axial end face of the arch foot embedded section 81 at the upper chord. The front support frame 2 at the upper chord is arranged side by side with the rear support frame 3 at the upper chord and is arranged below the arch foot embedded section 81 at the upper chord; the rear support frame 5 at the lower chord supports at least the axial end face of the arch foot embedded section 81 at the lower chord. The front support frame 4 at the lower chord is arranged below the arch foot embedded section 81 at the lower chord and is located on the side of the rear support frame 4 at the lower chord close to the center of the arch rib. The node support 1 supports at the lower chord node of the arch rib section.

[0026] In an optional embodiment, the embedded section support frame and the node support 1 are respectively arranged on the upstream and downstream of the arch rib, that is, a total of ten support points are formed as a whole. Through multi-point support, the stability of the overall assembly process of the arch foot embedded section 81 and the starting section of the arch rib is ensured.

[0027] In an optional embodiment, as Figure 2 shown, the front support frame 2 at the upper chord, the rear support frame 3 at the upper chord, the front support frame 4 at the lower chord, the rear support frame 5 at the lower chord, and the node support 1 are all independent steel truss structural members, and the adjustment mechanism 6 is respectively set on the front support frame 2 at the upper chord, the rear support frame 3 at the upper chord, the front support frame 4 at the lower chord, the rear support frame 5 at the lower chord, and the node support 1.

[0028] In an optional embodiment, as Figure 2As shown, the embedded section support frames are all arranged in the arch seat reserved notch 9. There can be two arch seat reserved notches 9, corresponding to the upper chord arch foot embedded section 81 and the lower chord arch foot embedded section 81 respectively. A first bottom plane 91 is arranged in the arch seat reserved notch 9 corresponding to the upper chord arch foot embedded section 81, and a second bottom plane 92 is arranged in the arch seat reserved notch 9 corresponding to the lower chord arch foot embedded section 81. The first bottom plane 91 and the second bottom plane 92 are horizontally arranged and have a height difference.

[0029] In an alternative embodiment, as Figures 2-7 shown, the upper chord front support frame 2 and the upper chord rear support frame 3 are arranged side by side on the first bottom plane 91, and the lower chord rear support frame 5 is arranged on the second bottom plane 92 and is located in the corner area formed by the arch seat reserved notch 9.

[0030] Further preferably, the arch seat reserved notch 9 corresponding to the upper chord arch foot embedded section 81 can be provided with an inclined surface 93 having the same inclination angle as the arch rib on the side close to the top of the arch rib, and the arch seat reserved notch 9 corresponding to the lower chord arch foot embedded section 81 can be provided with an inclined surface 93 having the same inclination angle as the arch rib on the side close to the bottom of the arch rib. The lower chord front support frame 4 is arranged between the inclined surface 93 of the arch seat reserved notch 9 and the lower chord 82 to ensure the stable setting of the upper and lower chord arch foot embedded sections 81 in the arch seat reserved notch 9, and enable the structural force during the assembly process to be smoothly transmitted to the arch seat through the corresponding support frames, providing a stable support foundation for the assembly process.

[0031] In an alternative embodiment, as Figures 2-7 shown, the upper chord rear support frame 3 can be a steel truss integral structural member with two triangular pyramid frame structures, so as to form a support surface parallel to the end face of the arch rib and a support surface parallel to the axial direction of the upper chord 84. Adjusting mechanisms 6 can be respectively arranged on different support surfaces. At the same time, the upper chord front support frame 2 can be a vertically assembled steel truss integral structural member to form a top table surface, and adjusting mechanisms 6 can be arranged on the top table surface to achieve multi-degree-of-freedom precise positioning adjustment of the upper chord 84.

[0032] In an alternative embodiment, as Figures 2-7 shown, the structure of the lower chord rear support frame 5 is similar to that of the upper chord rear support frame 3. Different from the upper chord front support frame 2, the structure of the lower chord front support frame 4 can be a simpler steel truss structural member. By arranging adjusting mechanisms 6 on the lower chord front support frame 4 and cooperating with the lower chord rear support frame 5 and the adjusting mechanisms 6 thereon, the structural force can be smoothly transmitted along the arch rib during the installation of the lower chord arch foot embedded section 81, and multi-degree-of-freedom precise positioning adjustment of the lower chord 82 can be achieved. In one or several embodiments, the node support 1 is arranged below the lower chord 82 and is located on the support plane 94 outside the arch seat reserved notch 9.

[0033] In an alternative embodiment, the node support 1 can be an integral steel truss structure assembled vertically. The node support 1 is supported at the lower chord node of the arch rib section, that is, at the lower chord node of the 1# section of the arch rib. The 1# section is the first section along the longitudinal direction of the arch rib close to the end of the arch rib. The lower chord node of the arch rib section is the theoretical intersection point of the chord and web members of the 1# section of the arch rib. By supporting the node with the node support 1, the overall support stability of the truss structure can be ensured.

[0034] In one or several embodiments, the adjusting mechanism 6 includes a three-way jack 61 and / or several one-way jacks 62.

[0035] In an alternative embodiment, three-way jacks 61 are respectively provided on the node support 1 and the front upper chord support 2, and several one-way jacks 62 are respectively provided on the front lower chord support 4, the rear upper chord support 3, and the rear lower chord support 5. The three-way jack 61 can be combined with a pump station and is only provided on the front upper chord support 2 and the node support 1. The pump station performs telescopic adjustment in the transverse bridge direction, longitudinal direction, and elevation direction through displacement sensors and oil pressure sensors, and is used to support the arch foot embedded section 81 during the initial assembly of the truss structure. After the truss structure is assembled, it performs overall coordinate positioning adjustment of the truss structure; the other one-way jacks 62 are installed on the corresponding supports and are used for preliminary positioning adjustment of a single member of the arch foot embedded section 81 during the assembly process of the truss structure and for cooperation with the three-way jack 61 on the node support 1 during the positioning and installation process of the lower chord member 82. After the truss structure is assembled, it is disconnected from the truss structure and does not participate in the overall coordinate positioning adjustment of the truss structure.

[0036] In an alternative embodiment, as Figures 2-7 shown, the front lower chord support 4 is provided with several transverse bridge direction one-way jacks 62 and several elevation direction one-way jacks 62; the rear upper chord support 3 and the rear lower chord support 5 are respectively provided with several transverse bridge direction one-way jacks 62, several mileage direction one-way jacks 62, and several elevation direction one-way jacks 62. To achieve stable and precise adjustment of multiple degrees of freedom of the arch foot embedded section 81.

[0037] S2. Sequentially position and install the arch foot embedded section 81 and the lower chord member 82 in cooperation with the adjusting mechanism 6, and connect the lower chord member 82 and the arch foot embedded section 81.

[0038] In one or several embodiments, several one-way jacks 62 respectively arranged on the front lower chord support frame 4, the rear upper chord support frame 3, and the rear lower chord support frame 5, and a three-way jack 61 arranged on the front upper chord support frame 2 can be used to assist in the synchronous positioning and installation of the arch foot embedded segments 81 on the upstream and downstream of the arch rib. After the upper chord arch foot embedded segment 81 and the lower chord arch foot embedded segment 81 are preliminarily positioned by each one-way jack 62 and the three-way jack 61 on the front upper chord support frame 2, the three-way jack 61 arranged on the node support 1 is used to assist in the synchronous positioning and installation of the lower chord members 82 on the upstream and downstream of the arch rib, and cooperate with other three-way jacks 61 and one-way jacks 62 to stably support the arch foot embedded segment 81. After the lower chord member 82 is preliminarily positioned by the three-way jack 61 on the node support 1, the connection between the lower chord member 82 and the corresponding arch foot embedded segment 81 is carried out.

[0039] S3. Connect the arch foot embedded segment 81 and the embedded segment support frame with the connecting plate 7, connect the lower chord member 82 and the node support 1 with the connecting plate 7, and release the contact between the adjusting mechanism 6 and the arch foot embedded segment 81.

[0040] In an optional embodiment, the connecting plates 7 are all steel plate-like structural members, and can realize the stable connection and fixation of the arch foot embedded segment 81 and the lower chord member 82 with the corresponding support frames through welding.

[0041] Specifically, during assembly, after the arch foot embedded segment 81 and the lower chord member 82 are successively preliminarily positioned, installed, and connected, the connecting plate 7 is welded on the corresponding support frame, and the arch foot embedded segment 81 and the lower chord member 82 are respectively fixed through the connecting plate 7, providing a stable and accurate installation foundation for the subsequent assembly of the overall truss, and avoiding displacement during the subsequent truss assembly process.

[0042] S4. Continue to assemble in a specified order to form the starting segment truss structure of the arch rib.

[0043] In one or several embodiments, the specified order includes successively assembling in the order of the lower chord horizontal bracing, the web member 83, the upper chord member 84, and the upper chord horizontal bracing to form a truss structure, so that the previously assembled and fixed structure provides support for the subsequently assembled and fixed structure, and the structural stability and relatively high positioning and installation accuracy can be ensured at each stage of the overall assembly process of the truss structure. Specifically, during assembly, on the basis of the structure in which the lower chord rod 82 and the lower chord arch foot embedded section 81 are limited and fixed by the connecting plate 7, the lower chord parallel joint is installed first, and the upstream and downstream lower chord rods 82 are connected into an integral frame to continue to form a stable structure as a stable structure supporting the web rod 83. Thereafter, the web rod 83 is installed, and the web rod 83, the upper chord arch foot embedded section 81, the upper chord front end support frame 2, and the upper chord rear end support frame 3 are used as support measures for the upper chord rod 84. The upper chord rod 84 and the upper chord parallel joint are installed. This ensures the overall stability of the assembly process and enables the truss structure to always remain a stable structure at any time during the assembly process.

[0044] S5. Release the connection of the connecting plate 7 in S3.

[0045] In an optional embodiment, after the truss structure is assembled as a whole, the truss structure can be tightened by the three-way jacks 61 respectively provided on the node bracket 1 and the upper chord front end support frame 2, and then the corresponding connecting plate 7 is removed, and the remaining one-way jacks 62 are kept in a state of being completely disengaged to avoid displacement of the truss structure during the removal of the connecting plate 7. After the connecting plate 7 is removed, the original ten support points of the truss structure are converted into four support points, reducing the external constraints of the truss structure during the overall coordinate adjustment process.

[0046] S6, coordinate with the measuring system, the control system and the adjusting mechanism 6 to automatically adjust the truss structure until the positioning coordinates meet the requirements, and then restore the connection plate 7 to fix it.

[0047] In one or more embodiments, in step S6, the one-way jack 62 is kept disconnected from the truss structure, and the positioning of the truss structure is adjusted by the three-way jack 61 provided on the node bracket 1 and the upper chord front end support frame 2. This can minimize the number of support points during the overall positioning and adjustment of the truss structure, and avoid constraints on the overall positioning and adjustment of the truss structure.

[0048] In one or more embodiments, in step S6, the regulating mechanism 6 is connected to the pump station; the measuring system includes a coordinate measuring instrument; the control system includes a signal transmission device and a visual operation interface, and the control system is respectively connected to the pump station and the coordinate measuring instrument by signal. The control system uses algorithm software to analyze the deviation between the actual measured value and the theoretical value of the coordinate parameters or spatial position form obtained by the measuring system, determines the displacement adjustment amount of the regulating mechanism 6, and then controls each jack to coordinate the lifting and retraction operations through the pump station, and cycles through multiple measurements and adjustments to achieve automatic positioning adjustment, reduce the difficulty of positioning adjustment, and further improve the adjustment efficiency and positioning quality.

[0049] In an alternative embodiment, the measurement system may adopt a total station and a prism combination. During use, a measuring prism is installed at the positioning point of the embedded section 81 at the springing of the arch, and the total station automatically tracks the prism to measure the coordinates of the positioning point.

[0050] In an alternative embodiment, the measurement system may adopt a combination of a scanner, a camera, etc. The spatial position and shape of the overall truss of the embedded section 81 at the springing of the arch are measured by the scanner, the camera, etc., and signals are transmitted to the control system to send the measured data to the control system for analysis and calculation.

[0051] In an alternative embodiment, the control system may include a signal transmission device, a visual operation interface, and algorithm software, and can transmit signals with the pump station of the adjusting mechanism 6 and the measurement system. After the coordinate parameters or spatial shape are measured by the measurement system, the algorithm software in the control system calculates and analyzes the deviation between the coordinate parameters or spatial position and shape and the theoretical values, and automatically analyzes and calculates the displacement adjustment amount required to adjust each jack point to the target position for the overall truss structure, so as to determine the strokes of the jacks to cooperate in lifting and contracting in different directions. Then, operation instructions are transmitted through the pump station to adjust the jacks to perform cooperative lifting and contracting operations, and the action processes of the jacks are overall planned, thus avoiding the situation where the truss structure cannot move due to the displacement of the truss structure being restricted by the jacks at other points when a certain point is lifted.

[0052] A construction method for the overall positioning of the embedded section at the arch foot of an arch bridge. Taking a mid - supported steel truss arch bridge as an example, the bridge is a bolt - connected steel truss arch. The positioning accuracy of its arch foot plays a key role in the installation accuracy of the whole bridge. To improve the installation accuracy and efficiency of the arch foot of the bridge, an embedded section support frame is set in the reserved notch 9 of the arch seat, a node support 1 is set on the support platform outside the reserved notch 9 of the arch seat, multiple single - acting jacks 62 are set on the rear support frame 3 of the upper chord, a three - acting jack 61 is set on the front support frame 2 of the upper chord, multiple single - acting jacks 62 are respectively set on the front support frame 4 and the rear support frame 5 of the lower chord, and a three - acting jack 61 is set on the node support 1 to form ten support points. Then, the embedded section 81 of the arch foot located in the arch seat is assisted in positioning and installation through the three - acting jack 61 and the single - acting jack 62 at the corresponding positions. After the preliminary positioning of the embedded section 81 of the arch foot, the preliminary positioning of the lower chord 82 is carried out in cooperation with the three - acting jack 61 on the node support 1. The preliminarily positioned lower chord 82 is connected to the embedded section 81 of the lower - chord arch foot, and then the fixed connection between the embedded section 81 of the arch foot at the corresponding position and the corresponding support frame is realized through the welded connecting plate 7. The lower chord 82 is fixedly connected to the node support 1 through the welded connecting plate 7, and the contact between the corresponding single - acting jack 62 and the embedded section 81 of the arch foot is released to realize the stable fixation of the embedded section 81 of the arch foot and the lower chord 82. After that, according to the set assembly sequence, the overall truss structure is assembled. Then, the three - acting jacks 61 on the node support 1 and the front support frame 2 of the upper chord are vertically jacked up to realize the tight connection between the lower chord 82 and the embedded section 81 of the upper - chord arch foot. After removing the connection of the connecting plate 7, the truss structure is vertically jacked up until it is slightly separated from other support frames, and the overall ten support points are converted into four support points to reduce the constraints on the overall truss structure. Finally, a measurement system is installed and combined with a control system. Through the control system, the measurement data is analyzed and judged, the positioning accuracy is judged, and adjustment instructions are made, so that the pump station controls the adjustment operations of each three - acting jack 61. The adjustment is repeated until the deviation of the overall positioning coordinates of the truss structure meets the requirements. Finally, the removed connecting plate 7 is reinstalled, the embedded section 81 of the upper - chord arch foot is connected and fixed to the support frames at its front and rear ends, and the lower chord 82 is connected and fixed to the node support 1. After removing each three - acting jack 61 and single - acting jack 62, the positioning installation of the embedded section 81 of the arch foot is completed.

[0053] A method for the overall positioning construction of the embedded section at the arch foot of an arch bridge. Through the cooperation of each support mechanism and the adjustment mechanism 6, the precise assembly of the embedded section 81 at the arch foot and the lower chord 82 is realized. Then, through the stable constraint of the connecting plate 7, a stable structural foundation is provided for the assembly of the truss structure, making the assembly accuracy of the truss structure relatively high. Then, by releasing the connection of the connecting plate 7 at the corresponding position, the adjustment of the number of support points is realized, effectively reducing the support points that play a restrictive role in the overall positioning adjustment process of the truss structure, so that the overall positioning adjustment process of the truss structure is carried out only under the support of four support points, without being overly restricted, which can improve the positioning and installation accuracy and efficiency, and ensure the stability of the overall positioning and installation process of the embedded section 81 at the arch foot of the arch bridge. At the same time, through the linkage of the measurement system, the control system and the adjustment mechanism 6 to realize the automatic adjustment of the adjustment mechanism 6, the requirements for operators can be reduced, and the mutual interference and restraint of each adjustment process can be further avoided, improving the construction efficiency.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for integral positioning construction of an arch bridge arch foot embedded section, characterized in that: The steps include: S1, installing a support mechanism, and setting an adjustment mechanism (6) on the support mechanism, wherein the support mechanism includes a pre-embedded section support frame and a node bracket (1); S2, cooperate with the adjustment mechanism (6) to sequentially position and install the arch foot embedded section (81) and the lower chord rod (82), and connect the lower chord rod (82) and the arch foot embedded section (81); S3, using a connecting plate (7) to connect the arch foot embedded section (81) and the embedded section support frame, using a connecting plate (7) to connect the lower chord (82) and the node bracket (1), and releasing the contact between the adjustment mechanism (6) and the arch foot embedded section (81); S4. Assemble in a prescribed order to form the truss structure of the starting section of the arch rib; S5, releasing the connection of the connecting plate (7) in S3; S6, coordinate with the measuring system, the control system and the regulating mechanism (6) to automatically adjust the truss structure until the positioning coordinates meet the requirements, and then restore the connection plate (7) to fix it.

2. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 1, characterized in that: In step S1, the embedded section support frame includes an upper chord front end support frame (2), an upper chord rear end support frame (3), a lower chord front end support frame (4) and a lower chord rear end support frame (5); The upper chord rear end support frame (3) at least supports the axial end surface of the upper chord arch foot embedded section (81); the upper chord front end support frame (2) and the upper chord rear end support frame (3) are arranged side by side and arranged below the upper chord arch foot embedded section (81); the lower chord rear end support frame (5) at least supports the axial end surface of the lower chord arch foot embedded section (81); the lower chord front end support frame (4) is arranged below the lower chord arch foot embedded section (81) and is located on the side of the lower chord rear end support frame (4) close to the center of the arch rib; The node bracket (1) is supported at the lower chord node between the arch ribs; The node bracket (1), the upper chord rear end support frame (3), the upper chord front end support frame (2), the lower chord rear end support frame (5) and the lower chord front end support frame (4) are respectively provided with an adjustment mechanism (6).

3. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 2, characterized in that: An upper chord front end support frame (2) and an upper chord rear end support frame (3) are arranged side by side on a first bottom plane (91) of a reserved notch (9) of the arch seat, and a lower chord rear end support frame (5) is arranged on a second bottom plane (92) of the reserved notch (9) of the arch seat, wherein the first bottom plane (91) is higher than the second bottom plane (92); A node bracket (1) is arranged on a supporting plane (94) outside the reserved notch (9) of the arch seat.

4. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 3, characterized in that: The adjustment mechanism (6) comprises a three-way jack (61) and / or a plurality of one-way jacks (62).

5. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 4, characterized in that: The node bracket (1) and the upper chord front end support frame (2) are respectively provided with three-way jacks (61), and the lower chord front end support frame (4), the upper chord rear end support frame (3) and the lower chord rear end support frame (5) are respectively provided with a plurality of one-way jacks (62).

6. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 5, characterized in that: The lower chord front end support frame (4) is provided with a plurality of one-way jacks (62) in the transverse direction and a plurality of one-way jacks (62) in the elevation direction; the upper chord rear end support frame (3) and the lower chord rear end support frame (5) are respectively provided with a plurality of one-way jacks (62) in the transverse direction, a plurality of one-way jacks (62) in the mileage direction and a plurality of one-way jacks (62) in the elevation direction.

7. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 6, characterized in that: In step S2, a plurality of one-way jacks (62) respectively arranged on the upper chord rear end support frame (3), the lower chord front end support frame (4) and the lower chord rear end support frame (5) and a three-way jack (61) arranged on the upper chord front end support frame (2) are used to assist the arch foot embedded sections (81) upstream and downstream of the arch rib to be synchronously positioned and installed; and then the three-way jacks (61) arranged on the node bracket (1) are used to assist the lower chord rods (82) upstream and downstream of the arch rib to be synchronously positioned and installed.

8. The method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to claim 7, characterized in that: In step S6, the one-way jack (62) is kept disconnected from the truss structure, and the positioning and adjustment of the truss structure are performed by means of the three-way jack (61) arranged on the node bracket (1) and the upper chord front end support frame (2).

9. A method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to any one of claims 1 to 8, characterized in that: In step S4, the prescribed sequence includes sequentially assembling the lower chord parallel connection, the web member (83), the upper chord member (84), and the upper chord parallel connection to form a truss structure.

10. A method for integrally positioning the pre-embedded section of an arch foot of an arch bridge according to any one of claims 1 to 8, characterized in that: In step S6, the regulating mechanism (6) is connected to the pump station; the measuring system includes a coordinate measuring instrument; The control system includes a signal transmission device and a visual operation interface, and the control system is respectively connected with the pump station and the coordinate measuring instrument signal.

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