A splicing base structure at the joint of a bridge steel truss and its construction method

Abstract

This invention relates to a splicing base structure and construction method for a steel truss girder joint of a bridge. The base structure includes a base frame and a tie rod mechanism. Two sets of symmetrically distributed node plates are installed on the base frame, and tie plates are installed at both ends of the two sets of node plates. The tie plates, the base frame, and the two sets of node plates form a splice plate base. The tie rod mechanism includes threaded rods and two sets of tie rod assemblies. A U-shaped frame is threaded onto the threaded rod, a support shaft is installed on the U-shaped frame, and a concave steel seat is installed on the support shaft. An H-shaped web member is installed in the concave steel seat using high-strength bolts. The monitoring component is used to monitor the inclination deformation of the H-shaped web member. The monitoring component includes a rack plate, a transverse base plate, and a metering component. An incomplete gear meshing with the rack plate is installed at the bottom end of each concave steel seat. This invention facilitates the overall splicing and installation of the bridge and improves installation accuracy. After installation, it enables monitoring of the connection angle of the H-shaped web member, improving the early warning capability for bridge safety hazards.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering node structure technology, and in particular to a splicing base structure at the node of a bridge steel truss and its construction method. Background Technology

[0002] The node plate base of a bridge steel truss is a key component that connects the various members of the truss (such as the upper chord, lower chord, web members, etc.), and is responsible for transmitting the internal forces between the members to ensure the integrity and stability of the structure.

[0003] In long-span steel truss bridges, integral gusset plates are generally used to ensure reliability and connection strength. When using integral gusset plates, the connection of the lower chord nodes requires the use of a base with a gusset plate. Here, the gusset plate for the lower chord connection is pre-embedded in the concrete box girder via shear keys. Because the gusset plate base is pre-embedded in the concrete box girder, and because there are errors caused by misalignment in the installation of the lower chord nodes, deviations in the control of the concrete beam surface elevation, and incomplete shrinkage and creep of the main beam concrete, the traditional integral gusset plate base faces difficulties in installation and connection with the web members. It requires on-site drilling and enlargement of the drilled holes to eliminate errors, making the installation operation very cumbersome and difficult to guarantee the connection accuracy, causing great trouble for later connection installations. Moreover, the existing gusset plate base installation and subsequent use lack monitoring of the deformation and tilt of the connection between the web members and the lower nodes of the integral steel truss.

[0004] Therefore, it is necessary to provide a new splicing base structure and construction method for bridge steel truss girder nodes to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a splicing base structure and construction method for bridge steel truss girder nodes. This structure can eliminate installation errors through a tie rod mechanism, facilitating the overall docking and installation of the bridge and improving installation accuracy. Furthermore, after installation, it can monitor the connection angle of the H-shaped web members, enhancing the early warning capability for bridge safety hazards.

[0006] To achieve the above technical objectives, the present invention provides a splicing base structure at the node of a bridge steel truss, the base structure including a bottom frame, a tie rod mechanism and a monitoring component; two sets of symmetrically distributed node plates are installed on the bottom frame, and tie plates are installed at both ends of the two sets of node plates and connected by two tie plates, the tie plates, the bottom frame and the two sets of node plates forming a splicing base;

[0007] The tie rod mechanism includes threaded rods and two sets of tie rod assemblies. The threaded rods are rotatably mounted on the base frame and distributed laterally. Each set of tie rod assemblies includes a U-shaped frame and a concave steel seat. The U-shaped frame is threaded onto the threaded rod, and a support shaft is mounted on the U-shaped frame. The concave steel seat is mounted on the support shaft with its concave opening facing upwards. An H-shaped web member is installed in the concave steel seat of each set of tie rod assemblies by high-strength bolts. A monitoring component for monitoring the tilt angle deformation of the H-shaped web member is installed on the U-shaped frame of each set of tie rod assemblies.

[0008] The monitoring component includes a rack plate, which is slidably installed in the middle of the concave surface of the U-shaped frame, and a horizontal base plate is fixedly installed at one end of the rack plate. A metering component for detecting the inclination deformation of the H-shaped web member is installed on the horizontal base plate. An incomplete gear for transmitting the inclination of the H-shaped web member is installed at the bottom end of each concave steel seat, and the incomplete gear meshes with the rack plate of the corresponding monitoring component.

[0009] A preferred technical solution of the present invention: two sets of metering components are respectively arranged on the outer side of the corresponding pull rod components, and two sets of horizontal base plates are respectively arranged at the non-adjacent ends of the two rack plates; the metering component includes a mounting base, the mounting base is fixedly installed on the corresponding horizontal base plate, and a sleeve is fixedly installed at the top of the mounting base. A lifting rod is slidably installed inside the sleeve. A bridge connecting rod is fixedly installed at the top of the lifting rod. Two connecting pieces are symmetrically hinged to the end of the bridge connecting rod away from the lifting rod. The two connecting pieces are fixedly connected to the belly of the H-shaped web rod; a spring seat is threadedly installed at the bottom of the mounting base. A piezoelectric sensor is embedded in the spring seat. A sliding plate is fixedly installed at the detection end of the piezoelectric sensor. A transmission spring is installed between the sliding plate and the bottom of the lifting rod.

[0010] The preferred technical solution of the present invention is as follows: the inner sidewalls of the two sets of node plates are each equipped with a side support plate, and the side support plate is provided with a groove that slides with the support shaft.

[0011] The preferred technical solution of the present invention is as follows: the pull plate is welded to the bottom of both ends of the two sets of node plates; multiple rows of first mounting holes of different heights are symmetrically provided on the plate surfaces of the two sets of node plates; second mounting holes are provided on the bottom frame, and the spacing of the second mounting holes matches that of the first mounting holes; multiple sets of third mounting holes for mounting concave steel seats are provided on the upper part of the two sets of node plates, each set of third mounting holes including multiple rows of mounting holes; multiple fourth mounting holes are provided on the concave steel seats; the web plate of the H-shaped web member is provided with a pre-positioning hole for connecting with the concave steel seat; and the side plate of the H-shaped web member and the concave steel seat are provided with a through-hole for drilling.

[0012] A further technical solution of the present invention: the base structure further includes a correction component for aligning the H-shaped web members during installation. The correction component is mounted on the upper center of the section plate base. The correction component includes a support frame, which is mounted on the middle of the two sets of node plates. Two sets of support rods that engage with the inner groove of the H-shaped web members are installed on the middle crossbar of the support frame. The two sets of support rods are symmetrically distributed based on the center of the two node plates and are slidably sleeved on the middle crossbar of the support frame. A driving component is installed on the support rod to drive the two sets of support rods to move closer to each other.

[0013] A preferred technical solution of the present invention is as follows: the piezoelectric sensor is electrically connected to a microcontroller, the microcontroller is embedded in the mounting base, and is communicatively connected to a host computer.

[0014] The preferred technical solution of the present invention is as follows: one end of the transmission spring is fixedly connected to the slide plate, and the other end of the transmission spring is fixedly installed with an I-beam chuck. The bottom end of the lifting rod is provided with a T-shaped groove for insertion into the I-beam chuck. A limit sleeve is installed at the top end of the sleeve, and a steel ball that fits against the outer wall of the lifting rod is installed on the inner side of the limit sleeve.

[0015] A preferred technical solution of the present invention: the driving component includes a bidirectional screw, the middle crossbar of the support frame has a through hole, and a horizontal sliding groove communicating with the through hole is provided on the middle crossbar of the support frame. The bidirectional screw is rotatably installed in the through hole of the middle crossbar of the support frame. Two sets of transmission plates are symmetrically threaded on the two sections of the bidirectional screw with different directions. The top of each set of transmission plates extends out of the sliding groove of the middle crossbar of the support frame and is fixedly installed with a ring push plate by screws. The ring push plate is slidably connected to the middle crossbar of the support frame and is located on the outside of the corresponding support rod.

[0016] This invention also provides a construction method for a splicing base structure at a bridge steel truss node, specifically including the following steps:

[0017] S1. Weld the tie plates to both ends of the two sets of node plates to form the outer frame of the segment plate base. Then, mark the axis and elevation control points on the pier or temporary support, set the settlement observation benchmark, and use a total station to monitor the positioning accuracy of the segment plate base outer frame in real time to ensure that the plane deviation is ≤3mm. Check that the distance and diagonal deviation between adjacent segment plate base outer frames are ≤L / 1500 and ≤10mm. According to the designed distribution points, connect the segment plate base outer frame to the PC box girder using PBL shear keys, and control its embedment depth in the beam to be ≥70cm to complete the pre-embedded pouring.

[0018] S2. After the pre-embedded pouring is completed, the bottom frame with the tie rod mechanism is fixed between the two sets of node plates with high-strength bolts to form the node plate base. When the bottom frame is installed, the positioning accuracy of the bottom frame is monitored in real time again using a total station to ensure that its plane difference is ≤3mm, which is used to eliminate the error in the elevation direction caused by settlement due to bridge deck pouring deformation and settlement.

[0019] S3. Use a total station to monitor the positioning accuracy of the H-shaped web member in real time. Drive the U-shaped frame by rotating the threaded rod to move the support shaft and concave steel seat horizontally, thereby adjusting the installation position of the H-shaped web member on the section plate base to eliminate mileage direction error. After eliminating mileage error, insert the H-shaped web member into the concave steel seat and fix it to the concave steel seat with high-strength bolts.

[0020] After connecting the S4 and H-type web members to the concave steel seats after eliminating mileage errors, install them one by one with the adjacent upper chord nodes according to the connection angle designed between the H-type web members and the upper chord nodes. After installation, fix the concave steel seats and H-type web members to the two sets of node plates with high-strength bolts to complete the installation of one set of base structures and two adjacent H-type web members.

[0021] S5. Repeat S1 to S4 to install the base structure and H-shaped web members at all nodes of all bridge steel trusses. After installation, the angle of the H-shaped web member connection is monitored by the metering component of the monitoring component at each node to avoid large inclination changes in the connection between the H-shaped web member and the section plate base and the upper chord node, which would cause the H-shaped web member to be deformed under stress.

[0022] S6. In the bridge design monitoring room, the metering components at all nodes of the entire bridge are numbered and located for monitoring via a host computer.

[0023] The preferred technical solution of this invention: The splicing base structure at the bridge steel truss girder node further includes a correction component. Each metering component includes a mounting base, sleeve, lifting rod, bridge connecting rod, connecting piece, spring seat, piezoelectric sensor, sliding piece, and transmission spring. The piezoelectric sensor is electrically connected to a microcontroller, and the microcontroller is communicatively connected to the host computer in the bridge design monitoring room. The construction steps also include the following steps:

[0024] In step S2, after the bottom frame is installed on the two sets of node plates, the side support plates used to provide auxiliary support for the support shaft are welded to the inside of the node plates.

[0025] In step S3, when the H-shaped web members are inserted, the correction assembly is used to center the two H-shaped web members that are connected on the section plate base to eliminate the offset displacement.

[0026] In step S5, after the entire steel truss bridge is assembled, the initial position of the sliding plate and the lifting rod is adjusted by rotating the spring seat. When the inclination angle remains unchanged after the H-shaped web members are installed, the piezoelectric sensor monitors and corrects the position. The host computer in the bridge design monitoring room numbers and positions the microcontrollers on the base of each node. Based on their position on the bridge, a reasonable safe fluctuation range value is designed for the piezoelectric sensor monitoring. When the corresponding node exceeds the safe fluctuation range value, the host computer issues an early warning, which facilitates timely inspection and maintenance of the warning node.

[0027] Compared with related technologies, the bridge steel truss girder splicing base structure and its construction method provided by the present invention have the following beneficial effects:

[0028] (1) By installing the bottom frame on two node plates during the installation of the lower chord node, the H-shaped web members are connected by the tie rod mechanism. In this way, the installation error can be eliminated by the tie rod mechanism when the entire steel truss girder node is connected, which facilitates the connection and installation of the entire bridge and improves the installation accuracy.

[0029] (2) This invention sets up a monitoring component, which utilizes a combination of a rack plate, a transverse base plate, a metering component, a mounting base, a sleeve, a limit sleeve, steel balls, a lifting rod, a bridge connecting rod, a connecting piece, a spring seat, a piezoelectric sensor, a sliding piece, a transmission spring, an I-beam chuck a, a microcontroller, an incomplete gear, and a T-slot to monitor the connection angle of the H-shaped web members after the nodes are connected and installed. Thus, when the bridge is subjected to forces (load, wind vibration, etc.) that exceed the bearing limit of the H-shaped web members and the H-shaped web members bend and deform, the metering component can monitor the amount of inclination deformation of the H-shaped web member connection and issue an early warning when it exceeds the safe range. This facilitates timely information transmission to the host computer when the H-shaped web members undergo large bending deformation, greatly improving the early warning capability for bridge safety hazards. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a preferred embodiment of the splicing base structure at the node of a bridge steel truss provided by the present invention.

[0031] Figure 2 A schematic diagram of a structure in which a tie rod mechanism and a monitoring component are mounted on a plate base provided by the present invention;

[0032] Figure 3 Another structural schematic diagram of the section plate base provided by the present invention, which is equipped with a tie rod mechanism and a monitoring component;

[0033] Figure 4 A schematic diagram of a tie rod mechanism mounted on the bottom frame provided by the present invention;

[0034] Figure 5A schematic diagram of a node plate with a correction component installed for the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the H-shaped web member provided by the present invention;

[0036] Figure 7 A schematic diagram of the axial cross-section of the metering component provided by the present invention;

[0037] Figure 8 A schematic diagram of a U-shaped frame with a rack plate installed on it, provided by the present invention;

[0038] Figure 9 This is a schematic diagram showing the connection of the splicing base structure at adjacent nodes.

[0039] Figure labels: 1. Base frame; 11. Second mounting hole; 2. Node plate; 21. Side support plate; 201. Groove; 22. First mounting hole; 23. Third mounting hole; 3. Pull plate; 4. Pull rod mechanism; 41. Threaded rod; 42. U-shaped frame; 43. Support shaft; 44. Concave steel seat; 45. Fourth mounting hole; 5. H-shaped web member; 51. Pre-positioning hole; 52. Drilling hole; 6. Monitoring component; 61. Rack plate; 62. Horizontal base plate; 63. Metering component; 631. Mounting base; 63 2. Sleeve; 6321. Limiting sleeve; 6322. Steel ball; 633. Lifting rod; 634. Bridge connecting rod; 635. Connecting piece; 636. Spring seat; 637. Piezoelectric sensor; 638. Sliding plate; 639. Transmission spring; 6391. I-beam chuck; 63a. Microcontroller; 64. Incomplete gear; 601. T-slot; 7. Correction assembly; 71. Support frame; 72. Support rod; 73. Driving component; 731. Bidirectional screw; 732. Transmission plate; 733. Ring pusher plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0042] Example 1:

[0043] This embodiment provides a splicing base structure at the joint of a bridge steel truss girder, such as Figures 1 to 9As shown, the splicing base structure includes a base frame 1, a tie rod mechanism 4, and a monitoring component 6. Two sets of symmetrically distributed node plates 2 are installed on the base frame 1. Tie plates 3 are installed at both ends of the two sets of node plates 2 and connected by two tie plates 3. The two sets of node plates 2, tie plates 3, and base frame 1 form a segment plate base. The tie rod mechanism 4 is installed inside the segment plate base. The tie plates 3 are welded to the bottom ends of the two sets of node plates 2. Multiple rows of first mounting holes 22 at different heights are symmetrically arranged on the surfaces of the two sets of node plates 2. Second mounting holes 11 are provided on the base frame 1. The first mounting holes 22 are used to fix the segment plate base inside the box girder and to install the base frame 1. The second mounting holes 11 and the first mounting holes 22 of the base frame 1 are connected by high-strength bolts. By selecting different heights of the first mounting holes 22, the installation height of the base frame 1 can be adjusted. The upper part of the two sets of node plates 2 is provided with multiple sets of third mounting holes 23. Each set of third mounting holes 23 includes multiple rows of mounting holes. The third mounting holes 23 are used to install the tie rod mechanism 4 and the H-shaped web rod 5.

[0044] In the embodiments, such as Figure 4 As shown, the tie rod mechanism 4 includes a threaded rod 41 and two sets of tie rod assemblies. The threaded rod 41 is rotatably mounted on the base frame 1 and distributed laterally. Each set of tie rod assemblies includes a U-shaped frame 42 and a concave steel seat 44. The U-shaped frame 42 is threaded onto the threaded rod 41, and a support shaft 43 is mounted on the U-shaped frame 42. The concave steel seat 44 is mounted on the support shaft 43 with its concave opening facing upwards. An H-shaped web member 5 is installed in the concave steel seat 44 of each set of tie rod assemblies by high-strength bolts, and a monitoring component 6 for monitoring the tilt angle deformation of the H-shaped web member 5 is installed on the U-shaped frame 42 of each set of tie rod assemblies. The concave steel seat 44 is provided with multiple fourth mounting holes 45, which correspond to the third mounting holes 23.

[0045] In the embodiments, such as Figure 4 , Figure 7 and Figure 8 As shown, the monitoring component 6 includes a rack plate 61, which is slidably mounted on the middle of the concave surface of the U-shaped frame 42. A horizontal base plate 62 is fixedly mounted on one end of the rack plate 61. A metering component 63 for detecting the tilt angle deformation of the H-shaped web member 5 is mounted on the horizontal base plate 62. An incomplete gear 64 for transmitting the tilt of the H-shaped web member 5 is mounted on the bottom end of the concave steel seat 44, and the incomplete gear 64 meshes with the rack plate 61. Two sets of metering components 63 are respectively located on the outer side of the corresponding tie rod components, and two sets of horizontal base plates 62 are respectively located at the non-adjacent ends of the two rack plates 61.

[0046] The metering component 63 includes a mounting base 631, which is fixedly mounted on the horizontal base plate 62. A sleeve 632 is fixedly mounted on the top of the mounting base 631. A lifting rod 633 is slidably mounted inside the sleeve 632. A bridge connecting rod 634 is fixedly mounted on the top of the lifting rod 633. Two connecting pieces 635 are symmetrically hinged to the end of the bridge connecting rod 634 away from the lifting rod 633. The two connecting pieces 635 are fixedly connected to the belly of the corresponding H-shaped web member 5. A spring seat 636 is threadedly mounted on the bottom of the mounting base 631. A piezoelectric sensor 637 is embedded in the spring seat 636. A slider 638 is fixedly mounted on the detection end of the piezoelectric sensor 637. A transmission spring 639 is installed between the slider 638 and the bottom of the lifting rod 633.

[0047] It should be noted that during use, after the outer frame of the segment plate base, consisting of the node plate 2 and the tie plate 3, is pre-embedded and fixed in the box girder according to the design distribution, the height of the outer frame of the segment plate base at each pre-embedded node is measured with high accuracy using a total station. Then, based on the height difference, the bottom frame 1 is installed on the outer frame of the segment plate base. By adjusting its position height up and down, the elevation error of the base is eliminated. Then, based on the mileage error between two adjacent nodes, the threaded rod 41 is rotated. The threaded rod 41 drives the U-shaped frame 42 of the two sets of tie rod assemblies to slide along the bottom frame 1 simultaneously, thereby adjusting the distance between the concave steel seats 44 on the two adjacent sets of segment plate bases. Since the segment plate base is pre-installed on the box girder according to the designed node distribution, the installation position of the H-shaped web member 5 needs to be eliminated by eliminating the front and rear mileage based on the pre-installed position deviation. The H-shaped web member 5 is installed on the concave steel seat 44, and the concave steel seat 44 is installed on the U-shaped frame 42. By moving the U-shaped frame 42 back and forth, the front and rear distance mileage error can be eliminated. To reduce the load when rotating the threaded rod 41, the mileage difference can generally be adjusted. After adjustment, the H-shaped web member 5 is inserted into the concave steel seat 44, and high-strength bolts are used to fix the H-shaped web member 5 to the concave steel seat 44. As the concave steel seat 44 moves, the position of the H-shaped web member 5 will be adjusted to eliminate the mileage error between the front and rear distances. After elimination, when the H-shaped web member 5 is connected to the upper chord node, the connection angle is manually adjusted. This is mainly achieved by rotating the connection with the support shaft 43 to adjust the docking angle to the design angle. Since the connection angle of the upper chord node is fixed, after the H-shaped web member 5 is installed on the concave steel seat 44, it can be rotated to the angle to dock with the upper chord node for docking installation. During the installation process, the angle monitoring component is set to a non-working state, so the angle monitoring component does not work during the adjustment process.

[0048] After the overall bridge connection is completed, the connection inclination angle of the H-shaped web member 5 is monitored using the monitoring component 6. During monitoring, when the H-shaped web member 5 is subjected to load and undergoes bending deformation, causing a change in its connection angle, the concave steel seat 44 is driven to rotate synchronously around the support shaft 43. When the concave steel seat 44 rotates, it drives the incomplete gear 64 to rotate synchronously. During rotation, the incomplete gear 64 meshes with the rack plate 61, thereby pulling the rack plate 61 to slide along the U-shaped frame 42. The metering component 63 is then used to monitor the connection angle of the H-shaped web member 5. The bending angle is monitored and measured (when the H-shaped web member 5 bends outward, the lifting rod 633 is pressed down along the sleeve 632 by the connecting piece 635 and the bridge connecting rod 634, thereby driving the sliding piece 638 to squeeze the piezoelectric sensor 637 through the transmission spring 639. The change in the piezoelectric sensor 637 is used, and then equal calculation is performed (specifically, after the piezoelectric sensor 637 detects the vertical displacement, combined with the original design connection angle, the angle offset is calculated according to the displacement using trigonometric functions. This calculation can be automatically achieved through programming design) to measure the bending deformation of the H-shaped web member 5 (the change in the inclination angle of the connection with the node). At the same time as the pressure is applied, the concave steel seat 44 flips outward toward the section plate base, and the rack plate 61 retracts inward toward the section plate base, thereby pulling the mounting seat 631 to move closer to the H-shaped web member 5. When it moves closer, the bridge connecting rod 634 further drives the lifting rod 633 to press down the transmission spring 639, thereby amplifying the bending deformation of the H-shaped web member 5 and improving the monitoring accuracy; when When the H-shaped web member 5 bends inward, the bridge connecting rod 634 further drives the lifting rod 633 to pull the transmission spring 639 upward. The concave steel seat 44 flips inward toward the section plate base, and the rack plate 61 extends outward toward the section plate base. When it extends, the mounting seat 631 moves away from the H-shaped web member 5, thereby further causing the lifting rod 633 to extend away from the sleeve 632, thus increasing the amount of deformation. Similarly, the change in the piezoelectric sensor 637 is used to measure the amount of tilt deformation, thereby realizing real-time monitoring of the H-shaped web member 5 after installation.

[0049] In Example 1, as Figure 4 As shown, the bottom frame 1 is also provided with a sliding groove corresponding to the horizontal bottom plate 62, which facilitates its movement along the bottom frame 1. Knobs are provided at both ends of the threaded rod 41, and each knob has a hexagonal countersunk hole, allowing a tool to be inserted into the countersunk hole to drive the threaded rod 41 to rotate, thereby adjusting and eliminating distance and mileage errors. In this invention, the threaded rod can be rotated manually by inserting a torque-enhancing wrench into the hexagonal countersunk hole of the threaded rod knob, or by using other existing rotating tools.

[0050] In the embodiments, such as Figure 8As shown, the piezoelectric sensor 637 is electrically connected to a microcontroller 63a, which is embedded in the mounting base 631 and is communicatively connected to a host computer. The host computer assigns a number and location to the microcontroller 63a and sets a safe range for numerical fluctuations. When the microcontroller 63a receives data from the electrically connected piezoelectric sensor 637, and the data detected by the piezoelectric sensor 637 exceeds the set value, it promptly feeds back to the host computer and issues an early warning. Then, through numbering and location, rapid detection and repair are performed, improving the early warning capability for bridge safety hazards.

[0051] Furthermore, such as Figure 7 As shown, in order to improve the moving stability of the lifting rod 633, a limiting sleeve 6321 is installed at the top of the sleeve 632. A steel ball 6322 that fits against the outer wall of the lifting rod 633 is installed on the inner side of the limiting sleeve 6321. In this way, when the bridge connecting rod 634 rotates with the H-shaped web member 5, it applies a non-vertical downward pressure to the lifting rod 633. Through the blocking of the steel ball 6322, the lifting rod 633 can move smoothly downward along the sleeve 632, thereby facilitating the conversion of the tilting and bending of the H-shaped web member 5 into the vertical movement of the lifting rod 633.

[0052] In this embodiment: one end of the transmission spring 639 is fixedly connected to the slide plate 638, and the other end of the transmission spring 639 is fixedly installed with an I-beam chuck 6391. The bottom end of the lifting rod 633 is provided with a T-slot 601 that is inserted into the I-beam chuck 6391. After the whole assembly is installed, in order to facilitate calibration and zeroing, the position of the piezoelectric sensor 637 extending into the sleeve 632 is adjusted by rotating the spring seat 636 (at this time, the transmission spring 639 rotates in the T-slot 601 through the I-beam chuck 6391) for setting the zero.

[0053] In this embodiment, please refer to Figure 1 , Figure 3 and Figure 4 Both sets of node plates 2 have side support plates 21 installed on their inner sidewalls. The side support plates 21 have grooves 201 that slide with the support shaft 43. In this way, after the support shaft 43 is connected to the concave steel seat 44, the side support plates 21 are used to strengthen the tension of the support shaft 43 and improve the tensile strength of the concave steel seat 44.

[0054] In this embodiment, please refer to Figure 1 and Figure 6The web of the H-shaped web member 5 is provided with a pre-positioning hole 51 for connecting with the concave steel seat 44, and the side plate of the H-shaped web member 5 and the concave steel seat 44 are provided with a drilled hole 52. In this way, when the H-shaped web member 5 and the concave steel seat 44 are connected, they are fixedly connected by the pre-positioning hole 51 and high-strength bolts. After eliminating various mileage errors, the node plate 2 is drilled from the inside to the outside through the drilled hole 52. Then, the concave steel seat 44 and the H-shaped web member 5 are fixed to the node plate 2 as a whole by high-strength bolts, thereby improving the overall connection strength.

[0055] Example 2:

[0056] Example 2, based on Example 1, further includes a correction assembly 7 for aligning the H-shaped web member 5 during installation, such as... Figures 1 to 5 As shown, the correction assembly 7 is mounted in the middle of the section plate base. The correction assembly 7 includes a support frame 71, which is mounted in the middle of the top of the two sets of node plates 2. The support frame 71 includes two support plates and a central crossbar. The two support plates are respectively connected to the two sets of node plates 2. Two sets of support rods 72 are installed on the central crossbar of the support frame 71 and engage with the inner groove of the H-shaped web rod 5. The two sets of support rods 72 are symmetrically distributed based on the center of the two node plates 2 and are slidably sleeved on the central crossbar of the support frame 71. A driving component 73 is installed on the support rod 72 to drive the two sets of support rods 72 to move closer to each other. The moving part 73 includes a bidirectional screw 731, which is rotatably installed in a through hole in the middle crossbar of the support frame 71. Two sets of transmission plates 732 are symmetrically threaded on the bidirectional screw 731. The two sets of transmission plates 732 are respectively threaded to two different threads of the bidirectional screw 731. A sliding groove is provided on the middle crossbar of the support frame 71. The top ends of the two sets of transmission plates 732 pass through the sliding groove on the middle crossbar of the support frame 71 and are fixedly installed with a ring push plate 733 by screws. The ring push plate 733 is slidably connected to the middle crossbar of the support frame 71 and is located on the outside of the corresponding support rod 72.

[0057] In Embodiment 2, during the installation of the H-shaped web members 5, when the two H-shaped web members 5 are inserted into the corresponding concave steel seats 44, the support rods 72 are pushed into the belly of the H-shaped web members 5. After being pushed in, by rotating the bidirectional screw 731, the bidirectional screw 731 drives the symmetrically distributed transmission plates 732 to move closer to each other. When they move closer to each other, the ring push plate 733 drives the two sets of support rods 72 to move closer to each other along the crossbar of the support frame 71, so that the two H-shaped web members 5 can be installed in the center on the section plate base, avoiding the twisting and deformation of the section plate base caused by traction.

[0058] Example 3:

[0059] Example 3 provides a construction method for the splicing base structure at the bridge steel truss girder node as described in Example 2, including the following steps:

[0060] S1. Weld the tie plate 3 to both ends of the two sets of node plates 2 to form the outer frame of the segment plate base. Then, mark the axis and elevation control points on the pier or temporary support, set the settlement observation benchmark, and use a total station to monitor the positioning accuracy of the segment plate base outer frame in real time to ensure that the plane deviation is ≤3mm. Check the spacing and diagonal deviation of the adjacent segment plate base outer frames (≤L / 1500 and ≤10mm). According to the designed distribution points, connect the segment plate base outer frame to the PC box girder using PBL shear keys, control its embedment depth in the beam to be ≥70cm, and complete the pre-embedded pouring.

[0061] S2. After the pre-embedded pouring is completed, the bottom frame 1 with the tie rod mechanism 4 is fixed between the two sets of node plates 2 with high-strength bolts to form the node plate base. When the bottom frame is installed, the positioning accuracy of the bottom frame is monitored in real time again using a total station to ensure that its plane difference is ≤3mm, which is used to eliminate the error in the elevation direction caused by settlement due to bridge deck pouring deformation and settlement. After the bottom frame 1 is installed on the two sets of node plates 2, the side support plate used to assist the support shaft is welded to the inner side of the node plate 2.

[0062] S3. Using a total station to monitor the positioning accuracy of the H-shaped web member 5 in real time, the U-shaped frame 42 is driven by rotating the threaded rod 41 to move the support shaft 43 and the concave steel seat 44 horizontally, thereby adjusting the installation position of the H-shaped web member 5 on the section plate base to eliminate mileage direction error. After eliminating the mileage error, the H-shaped web member 5 is inserted into the concave steel seat 44, and then high-strength bolts are inserted into the pre-positioned holes 51 to fix it to the concave steel seat 44. When the H-shaped web member 5 is inserted, the correction component 7 is used to center the two H-shaped web members 5 on the section plate base to eliminate the offset displacement.

[0063] S4. After the H-shaped web members are inserted into the concave steel seats and the mileage error is eliminated, they are connected to the adjacent upper chord nodes one by one according to the designed connection angle between the H-shaped web members and the upper chord nodes. After the connection is completed, holes are drilled from the inside to the outside of the two sets of node plates using the drill holes. The concave steel seats and H-shaped web members are then fixed to the two sets of node plates using high-strength bolts to complete the final installation. After installation, the metering component of the monitoring assembly is used to monitor the connection angle to avoid large changes in the tilt angle between the H-shaped web members and the section plate base and the upper chord node, which would cause the H-shaped web members to be deformed under stress. After the entire steel truss bridge is assembled, the metering component adjusts the initial position of the sliding plate and the lifting rod by rotating the spring seat so that the piezoelectric sensor monitors and corrects the tilt angle when it has not changed after the H-shaped web members are connected and installed.

[0064] S5. In the bridge design monitoring room, the microcontrollers on the node bases of the entire bridge are numbered and located by the host computer. Based on their location on the bridge, the piezoelectric sensors are monitored to design a reasonable safety fluctuation range. When the corresponding node exceeds the safety fluctuation range, the host computer issues an early warning, which facilitates timely inspection and maintenance of the warning node.

[0065] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0066] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A splicing base structure at the joint of a bridge steel truss girder, characterized in that: The base structure includes a base frame (1), a tie rod mechanism (4), and a monitoring component (6); two sets of symmetrically distributed node plates (2) are installed on the base frame (1), and tie plates (3) are installed at both ends of the two sets of node plates (2) and connected by the two tie plates (3). The tie plates (3), the base frame (1), and the two sets of node plates (2) form a node plate base. The tie rod mechanism (4) includes a threaded rod (41) and two sets of tie rod assemblies. The threaded rod (41) is rotatably mounted on the bottom frame (1) and distributed laterally. Each set of tie rod assemblies includes a U-shaped frame (42) and a concave steel seat (44). The U-shaped frame (42) is threaded onto the threaded rod (41). A support shaft (43) is mounted on the U-shaped frame (42). The concave steel seat (44) is mounted on the support shaft (43) with its concave opening facing upward. An H-shaped web member (5) is installed in the concave steel seat (44) of each set of tie rod assemblies by high-strength bolts. A monitoring component (6) for monitoring the tilt angle deformation of the H-shaped web member (5) is installed on the U-shaped frame (42) of each set of tie rod assemblies. The monitoring component (6) includes a rack plate (61), which is slidably installed in the middle of the concave surface of the U-shaped frame (42), and a horizontal base plate (62) is fixedly installed at one end of the rack plate (61). A metering component (63) for detecting the tilt angle deformation of the H-shaped web member (5) is installed on the horizontal base plate (62). An incomplete gear (64) for transmitting the tilt of the H-shaped web member (5) is installed at the bottom end of each concave steel seat (44), and the incomplete gear (64) meshes with the rack plate (61) of the corresponding monitoring component (6). Two sets of metering components (63) are respectively set on the outer side of the corresponding tie rod components, and two sets of horizontal base plates (62) are respectively set at the non-adjacent ends of the two rack plates (61). The metering component (63) includes a mounting base (631), which is fixedly installed on the U-shaped frame (42). On the corresponding horizontal base plate (62), and the top of the mounting base (631) is fixedly installed with a sleeve (632), a lifting rod (633) is slidably installed inside the sleeve (632), a bridge connecting rod (634) is fixedly installed at the top of the lifting rod (633), and two connecting pieces (635) are symmetrically hinged to the end of the bridge connecting rod (634) away from the lifting rod (633). The two connecting pieces (635) are fixedly connected to the belly of the H-shaped web rod (5). A spring seat (636) is threadedly installed at the bottom of the mounting base (631), a piezoelectric sensor (637) is embedded in the spring seat (636), a slider (638) is fixedly installed at the detection end of the piezoelectric sensor (637), and a transmission spring (639) is installed between the slider (638) and the bottom of the lifting rod (633).

2. The splicing base structure at the node of a bridge steel truss girder according to claim 1, characterized in that: The inner walls of the two sets of node plates (2) are each equipped with a side support plate (21), and the side support plate (21) has a groove (201) that slides with the support shaft (43).

3. The splicing base structure at the node of a bridge steel truss girder according to claim 1, characterized in that: The pull plate (3) is welded to the bottom of both ends of the two sets of node plates (2). Multiple rows of first mounting holes (22) of different heights are symmetrically provided on the plate surfaces of the two sets of node plates (2). Second mounting holes (11) are provided on the bottom frame (1). The spacing of the second mounting holes (11) matches that of the first mounting holes (22). Multiple sets of third mounting holes (23) for installing concave steel seats (44) are provided on the upper part of the two sets of node plates (2). Each set of third mounting holes (23) includes multiple rows of mounting holes. Multiple fourth mounting holes (45) are provided on the concave steel seat (44). The web plate of the H-shaped web member (5) is provided with a pre-positioning hole (51) for connecting with the concave steel seat (44). The side plate of the H-shaped web member (5) and the concave steel seat (44) are provided with a drilled hole (52).

4. The splicing base structure at the node of a bridge steel truss girder according to claim 1, characterized in that: The base structure also includes a correction component (7) for aligning the H-shaped web member (5) during installation. The correction component (7) is mounted on the upper center of the section plate base. The correction component (7) includes a support frame (71) which is mounted on the middle of the two sets of node plates (2). The middle crossbar of the support frame (71) is equipped with two sets of support rods (72) that engage with the inner groove of the H-shaped web member (5). The two sets of support rods (72) are symmetrically distributed based on the center of the two node plates (2) and are slidably sleeved on the middle crossbar of the support frame (71). The support rods (72) are equipped with a driving component (73) that drives the two sets of support rods (72) to move closer to each other.

5. The splicing base structure at the node of a bridge steel truss girder according to claim 1, characterized in that: The piezoelectric sensor (637) is electrically connected to a microcontroller (63a), which is embedded in the mounting base (631) and is communicatively connected to a host computer.

6. The splicing base structure at the node of a bridge steel truss girder according to claim 1, characterized in that: One end of the transmission spring (639) is fixedly connected to the slide plate (638), and the other end of the transmission spring (639) is fixedly installed with an I-beam chuck (6391). The bottom end of the lifting rod (633) is provided with a T-slot (601) for insertion into the I-beam chuck (6391). The top end of the sleeve (632) is equipped with a limiting sleeve (6321), and the inner side of the limiting sleeve (6321) is equipped with a steel ball (6322) that fits against the outer wall of the lifting rod (633).

7. The bridge steel truss girder joint splicing base structure according to claim 4, characterized in that: The driving component (73) includes a bidirectional screw (731). The middle crossbar of the support frame (71) has a through hole, and a horizontal groove communicating with the through hole is provided on the middle crossbar of the support frame (71). The bidirectional screw (731) is rotatably installed in the through hole of the middle crossbar of the support frame (71). Two sets of transmission plates (732) are symmetrically threaded on the two different threads of the bidirectional screw (731). The top of each set of transmission plates (732) extends out of the groove of the middle crossbar of the support frame (71), and a ring push plate (733) is fixedly installed by screws. The ring push plate (733) is slidably connected to the middle crossbar of the support frame (71) and is located on the outside of the corresponding support rod (72).

8. A construction method for a bridge steel truss girder joint splicing base structure as described in any one of claims 1 to 7, characterized in that, Specifically, the following steps are included: S1. Weld the tie plates to both ends of the two sets of node plates to form the outer frame of the segment plate base. Then, mark the axis and elevation control points on the pier or temporary support, set the settlement observation benchmark, and use a total station to monitor the positioning accuracy of the segment plate base outer frame in real time to ensure that the plane deviation is ≤3mm. Check that the distance and diagonal deviation between adjacent segment plate base outer frames are ≤L / 1500 and ≤10mm. According to the designed distribution points, connect the segment plate base outer frame to the PC box girder using PBL shear keys, and control its embedment depth in the beam to be ≥70cm to complete the pre-embedded pouring. S2. After the pre-embedded pouring is completed, the bottom frame with the tie rod mechanism is fixed between the two sets of node plates with high-strength bolts to form the node plate base. When the bottom frame is installed, the positioning accuracy of the bottom frame is monitored in real time again using a total station to ensure that its plane difference is ≤3mm, which is used to eliminate the error in the elevation direction caused by the deformation and settlement of the bridge deck pouring. S3. Use a total station to monitor the positioning accuracy of the H-shaped web member in real time. Drive the U-shaped frame by rotating the threaded rod to move the support shaft and concave steel seat horizontally, thereby adjusting the installation position of the H-shaped web member on the section plate base to eliminate mileage direction error. After eliminating mileage error, insert the H-shaped web member into the concave steel seat and fix it to the concave steel seat with high-strength bolts. After connecting the S4 and H-type web members to the concave steel seats after eliminating mileage errors, install them one by one with the adjacent upper chord nodes according to the connection angle designed between the H-type web members and the upper chord nodes. After installation, fix the concave steel seats and H-type web members to the two sets of node plates with high-strength bolts to complete the installation of one set of base structures and two adjacent H-type web members. S5. Repeat S1 to S4 to install the base structure and H-shaped web members at all nodes of all bridge steel trusses. After installation, the angle of the H-shaped web member connection is monitored by the metering component of the monitoring component at each node to avoid large inclination changes in the connection between the H-shaped web member and the section plate base and the upper chord node, which would cause the H-shaped web member to be deformed under stress. S6. In the bridge design monitoring room, the metering components at all nodes of the entire bridge are numbered and located for monitoring via a host computer.

9. The construction method of the splicing base structure at the joint of a bridge steel truss girder according to claim 8, characterized in that: The splicing base structure at the bridge steel truss node also includes a correction assembly. Each metering assembly includes a mounting base, sleeve, lifting rod, bridge connecting rod, connecting plate, spring seat, piezoelectric sensor, sliding plate, and transmission spring. The piezoelectric sensor is electrically connected to a microcontroller, which is communicatively connected to the host computer in the bridge design monitoring room. The construction steps also include the following: In step S2, after the bottom frame is installed on the two sets of node plates, the side support plates used to provide auxiliary support for the support shaft are welded to the inside of the node plates. In step S3, when the H-shaped web members are inserted, the correction assembly is used to center the two H-shaped web members that are connected on the section plate base to eliminate the offset displacement. In step S5, after the entire steel truss bridge is assembled, the initial position of the sliding plate and the lifting rod is adjusted by rotating the spring seat. When the inclination angle remains unchanged after the H-shaped web members are installed, the piezoelectric sensor monitors and corrects the position. The host computer in the bridge design monitoring room numbers and positions the microcontrollers on the base of each node. Based on their position on the bridge, a reasonable safe fluctuation range value is designed for the piezoelectric sensor monitoring. When the corresponding node exceeds the safe fluctuation range value, the host computer issues an early warning, which facilitates timely inspection and maintenance of the warning node.

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