A bridge steel truss girder gusset plate structure and its construction method

Abstract

The present invention relates to the technical field of bridge engineering, and particularly relates to a joint plate structure of a bridge steel truss beam and a construction method thereof. The joint plate structure of the bridge steel truss beam includes a π-shaped joint plate composed of a bottom plate and a vertical plate. A plurality of H-shaped steel seats are installed in the π-shaped joint plate. Each H-shaped steel seat is installed with an H-shaped web member through high-strength bolts. A monitoring component for warning of the internal stress of the π-shaped joint plate is provided in each H-shaped steel seat. The monitoring component includes a tension sensor for monitoring the stress between the H-shaped steel seat and the H-shaped web member and a gear for transmitting the stress. A steel rib is correspondingly provided at the insertion end of the H-shaped web member, and a steel tooth portion for driving the gear to rotate is provided on the steel rib. The tension sensor provided in the joint plate of the present invention can obtain the stress data of the connection part in real time, and this data enables the staff to take measures before the structure is severely damaged or fails, greatly improving the early warning ability of bridge safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering gusset plate structures, and particularly relates to a bridge steel truss girder gusset plate structure and a construction method thereof. Background Art

[0002] The forms of gusset plates of bridge steel truss girders include externally attached type, inserted type, integral type, etc. In long-span steel truss girder bridges, in order to ensure reliability and connection strength, integral gusset plates are generally used. Since the nodes concentrate various structures of the steel truss girder and the stress is relatively complex, the stress distribution between the gusset plate and the web member is uneven. And because the contact between the gusset plate and the web member is basically sliding contact, the wear of the plate surface between the two is serious and stress concentration occurs. Moreover, under the action of repeated loads (such as vehicle loads, wind vibrations), fatigue damage is likely to occur in the stress concentration area, and the fatigue crack propagation may significantly reduce the safety performance of the gusset plate. However, it is difficult for the monitoring personnel to know the hidden danger of the damaged gusset plate in time, resulting in the inability to send an emergency warning after the stress damage between the bridge gusset plate and the web member.

[0003] Therefore, it is necessary to provide a new bridge steel truss girder gusset plate structure and a construction method thereof to solve the above technical problems. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a bridge steel truss girder gusset plate structure and a construction method thereof. The gusset plate structure can obtain the stress data of the connection part in real time and can improve the bridge warning ability.

[0005] To achieve the above technical purpose, the present invention provides a bridge steel truss girder gusset plate structure, including a bottom plate. Two symmetrically distributed vertical plates are fixedly welded on the bottom plate, and the bottom plate and the two vertical plates form a π-shaped gusset plate. A plurality of symmetrically distributed tie plates are fixedly installed between the bottom plate and the two vertical plates. A plurality of H-shaped steel seats are installed in the π-shaped gusset plate. Each H-shaped steel seat is installed with an H-shaped web member through high-strength bolts. A monitoring component for warning the internal stress of the π-shaped gusset plate is provided in each H-shaped steel seat;

[0006] A filling steel plate is installed inside the flange of the H-shaped steel seat. The monitoring component is installed on the filling steel plate. The monitoring component includes a tension sensor for monitoring the stress between the H-shaped steel seat and the H-shaped web member, and a gear for transmitting stress. The gear is rotatably installed on the filling steel plate and is connected to the tension sensor through a force transmission component. An H-shaped jack matching the H-shaped web member is provided inside the H-shaped steel seat. Steel balls are installed on both side walls at the flange plate position of the H-shaped jack. Steel bars in contact with the steel balls are fixedly installed on both side walls of the flange of the connection end of the H-shaped web member and the H-shaped steel seat. A steel rib is fixedly embedded in the outer plate wall of the flange of the part where the H-shaped web member is inserted into the H-shaped jack. A steel tooth part for driving the gear to rotate is arranged on the steel rib. The H-shaped web member is inserted into the H-shaped jack of the corresponding H-shaped steel seat. The steel bars on each side are in rolling contact with the corresponding steel balls on each side, and the steel tooth part is meshed with the gear.

[0007] A preferred technical solution of the present invention: A waist cavity is opened on the filling steel plate. The gear is rotatably installed on the inner top wall of the waist cavity through a bracket. An annular groove is opened in the middle of the gear. A steel wire is fixedly embedded in the annular groove. The other end of the steel wire bypasses the annular groove for multiple circles and is fixedly connected to the connection end of the tension sensor. The bottom of the tension sensor is fixedly installed with a middle connection plate elastically connected to the inner bottom wall of the waist cavity.

[0008] A preferred technical solution of the present invention: Each H-shaped steel seat is an H-shaped structure composed of a web and flanges fixedly connected to both ends of the web. A hollow cavity A is opened on the web, and hollow cavities B are symmetrically opened on both flanges. The hollow cavity A and the hollow cavity B form an H-shaped jack for inserting the connection end of the H-shaped web member. Installation cavities for inserting the filling steel plate are symmetrically opened on both flanges of each H-shaped steel seat. One end of each installation cavity is communicated with the corresponding hollow cavity B. The filling steel plate is inserted into the corresponding installation cavity and fixedly welded to the flange. The filling steel plate is located at the end of the installation cavity that is not communicated with the hollow cavity B. The width of the filling steel plate is half of the width of the installation cavity. Two steel ribs are symmetrically arranged on each H-shaped web member, and both steel ribs are arranged in the middle of the flange of the H-shaped web member. The width of each side of the steel rib and the steel tooth part is half of the width of the installation cavity. After the H-shaped web member is inserted into the H-shaped jack of the corresponding H-shaped steel seat, the steel ribs on both sides of it and the steel tooth part are correspondingly inserted into the connection end of the installation cavity and the hollow cavity B, and the steel tooth part is meshed with the gear.

[0009] A preferred technical solution of the present invention: A strong spring is fixedly installed on the lower disk surface of the middle connection plate, and the other end of the strong spring is fixedly connected to the inner bottom wall of the waist cavity.

[0010] A better technical solution of the present invention: the inner walls on both sides of each hollow B cavity of the H-shaped steel seat are provided with insertion grooves for inserting steel bars, and the groove walls on both sides of the insertion grooves are provided with cylindrical side grooves, each of the cylindrical side grooves stores a number of evenly distributed steel balls, and one-third of the sphere of the steel ball extends into the insertion groove; the two side walls of the steel bar on each side of the H-shaped web rod are provided with arc-shaped cavities, and when the H-shaped web rod is inserted into the corresponding H-shaped steel seat, the arc-shaped cavities on both sides of the steel bar respectively roll in contact with the extended parts of the steel balls at the corresponding positions.

[0011] A better technical solution of the present invention: a plurality of evenly distributed docking A holes are provided on the web of each H-shaped steel seat, and rubber gaskets with through holes are fixedly embedded on both side walls of the hollow A cavity provided on the web; a plurality of docking B holes are correspondingly provided on the web edge plate of the H-shaped web rod connecting end, and after the H-shaped web rod connecting end is inserted into the H-shaped steel seat, it is fixedly connected by high-strength bolts passing through the docking A holes and the docking B holes.

[0012] A better technical solution of the present invention: a contact-type signal transmitter for transmitting early warning signals is fixedly installed on the inner bottom wall of the waist cavity, and an abutment column for starting the contact-type signal transmitter is fixedly installed on the lower disk surface of the central connecting disk, and the contact-type signal transmitter and the abutment column are both located in the inner circle of the strong spring; the tension sensor and the contact-type signal transmitter of each monitoring component are communicatively connected to the control system of the bridge design monitoring room.

[0013] In order to achieve the above technical purpose, the present invention also provides a construction method of the above bridge steel truss node plate structure, which specifically includes the following steps:

[0014] S1. After the bottom plate and the vertical plate are welded to form a π-shaped node plate, a tension plate is added to reinforce and form a node plate;

[0015] S2. Place the axis and elevation control points on the pier or temporary pier, set the settlement observation benchmark, use the total station to monitor the positioning accuracy of the node plate in real time, ensure that the plane deviation is ≤3mm, check the spacing and diagonal deviation of adjacent node plates, and fine-tune the position by jack to ensure that the diagonal deviation is ≤L / 1500 and ≤10mm, where L is the spacing between adjacent node plates; the diagonal deviation is the deviation spacing between the straight line between the center points of two adjacent node plates and the bridge axis;

[0016] S3. Determine the number of H-shaped web members connected to each gusset plate and the installation angle of each H-shaped web member according to the bridge design drawings. Weld H-shaped steel seats equal in number to the H-shaped web members within the gusset plate, while ensuring that the welded H-shaped steel seats match the installation angles of the H-shaped web members. Before each H-shaped steel seat is welded to the gusset plate, install the filler steel plates and monitoring components within the corresponding H-shaped steel seats. The tension sensors of each monitoring component are communicatively connected to the control system of the bridge design monitoring room.

[0017] S4. After the H-shaped steel seats are welded within the gusset plate, insert the connecting ends of the H-shaped web members into the H-shaped jacks opened in the H-shaped steel seats. During the insertion process, the steel ribs at the connecting ends of the H-shaped web members contact the monitoring components on the filler steel plates, and the steel teeth on the steel ribs engage with the gears, driving the gears to rotate and wind up the steel wires. As a result, the strong spring stretches and the stable tension value detected by the tension sensor is the predetermined value. At the same time, the steel bars contact the steel balls within the H-shaped jacks to form a rolling connection.

[0018] S5. After the H-shaped web members on the gusset plate are inserted and connected, use high-strength bolts to fix the H-shaped web members to the gusset plate.

[0019] A preferred technical solution of the present invention: Touch-type signal transmitters are installed on the filler steel plates of each H-shaped steel seat. Multiple touch-type signal transmitters are communicatively connected to the control system within the bridge design monitoring room. Input the predetermined value of each tension sensor in step S4 into the control system within the bridge design monitoring room. Through the control system within the bridge design monitoring room, real-time monitoring is performed on the tension sensors within each gusset plate, and the real-time monitoring values are compared with the input predetermined values. When the real-time monitored tension value is equal to or greater than the predetermined value, a warning signal is issued. And number the touch-type signal transmitters in each gusset plate in the control system of the bridge design monitoring room. When the touch-type signal transmitter emits a signal, it can quickly determine which gusset plate has a problem.

[0020] A preferred technical solution of the present invention: In step S3, in the bridge design, vertical H-shaped web members and diagonal H-shaped web members are connected to each gusset plate. The vertical H-shaped web members are used to connect two symmetric gusset plates above and below, and the diagonal H-shaped web members are used to connect two adjacent gusset plates above and below. Before installing the H-shaped steel seats, insert the filler steel plates fixed with monitoring components into the corresponding installation cavities opened on the wing plates. Two sets of detection components are symmetrically installed on each H-shaped steel seat. In step S4, the steel ribs are inserted into the remaining cavities of the installation cavities, and the steel teeth on the steel ribs engage with the gears on the corresponding filler steel plates. The steel bars are inserted into the insertion grooves and contact the built-in steel balls.

[0021] Compared with the related art, the present invention has the following beneficial effects:

[0022] 1. In the present invention, when the H-shaped web member undergoes stress side-slip with the H-shaped steel seat due to the dynamic energy induced by vehicle loads, wind vibrations, and earthquakes, the tension sensor can obtain the stress data of the connection part in real time, enabling the staff to take measures before the structure suffers serious damage or failure. If the driving wire breaks due to dynamic energy, the chip-type signal transmitter will send an emergency warning to the cloud analysis platform of the control terminal in the bridge design monitoring room, greatly enhancing the early warning ability for potential bridge safety hazards and avoiding major safety accidents such as bridge collapses, thus ensuring the safety of personnel's lives and property.

[0023] 2. In the present invention, steel balls are arranged between the H-shaped web member and the gusset plate to convert the sliding friction between the H-shaped web member and the gusset plate into rolling friction, greatly reducing the friction coefficient and the frictional force. This helps to more smoothly transfer the force of the H-shaped web member to the gusset plate when the structure is stressed, reducing the energy loss and stress concentration caused by friction and improving the overall mechanical properties of the structure. Under dynamic loads (such as vehicle loads, wind vibrations, and earthquakes), the steel balls can play a certain role in energy dissipation and shock absorption. They can absorb and dissipate a part of the seismic energy through rolling and small displacements, reducing the vibration response between the H-shaped web member and the gusset plate and enhancing the seismic resistance of the gusset plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a preferred embodiment of the bridge steel truss gusset plate structure provided by the present invention;

[0025] Figure 2 For Figure 1 the installation structural diagram of the H-shaped steel seat shown on the vertical plate;

[0026] Figure 3 For Figure 2 the installation structural diagram of the steel plate filled in the H-shaped steel seat shown;

[0027] Figure 4 For Figure 3 the structural diagram of the H-shaped steel seat shown;

[0028] Figure 5 For Figure 4 the top view structural diagram of the H-shaped steel seat shown;

[0029] Figure 6 For Figure 4 one of the cross-sectional structural diagrams of the wing plate of the H-shaped steel seat shown;

[0030] Figure 7 For Figure 4 the other cross-sectional structural diagram of the wing plate of the H-shaped steel seat shown;

[0031] Figure 8 For Figure 7Schematic diagram of the installation structure of the monitoring component on the filled steel plate shown;

[0032] Figure 9 For Figure 1 Schematic diagram of the structure of the H-shaped web member shown;

[0033] Figure 10 Schematic diagram of the connection structure between the gusset plate and the H-shaped web member in the gusset plate structure of the bridge steel truss beam provided by the present invention;

[0034] Figure 11 Schematic plan view of the connection between the gusset plate structure of the bridge steel truss beam provided by the present invention and the H-shaped web member.

[0035] Reference numerals in the figure: 1, bottom plate; 2, vertical plate; 1-2, tie plate; 3, H-shaped steel seat; 31, web; 31a, hollow cavity A; 31b, docking hole A; 32, flange; 32a, hollow cavity B; 32b, insertion groove; 32c, cylindrical side groove; 32d, installation cavity; 4, steel ball; 5, filled steel plate; 5a, waist cavity; 6, monitoring component; 61, gear; 61a, annular groove; 611, bracket; 62, steel wire; 63, intermediate coupling plate; 64, tension sensor; 65, strong spring; 66, contact type signal transmitter; 67, abutting column; 7, H-shaped web member; 7a, docking hole B; 71, steel bar; 71a, arc cavity; 72, steel rib; 721, steel tooth part; 8, rubber gasket. Specific embodiments

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0037] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0038] Please refer to Figures 1 to 11, a bridge steel truss girder gusset plate structure provided by an embodiment of the present invention includes a bottom plate 1. Two symmetrically distributed vertical plates 2 are fixedly welded on the bottom plate 1, and the bottom plate 1 and the two vertical plates 2 form a π-shaped gusset plate. A plurality of symmetrically distributed tie plates 1-2 are fixedly installed between the bottom plate 1 and the two vertical plates 2 to increase the connection stability between the bottom plate 1 and the two vertical plates 2 and enhance the connection strength of the π-shaped gusset plate. A plurality of H-shaped steel seats 3 are installed in the π-shaped gusset plate. The H-shaped steel seats 3 are used to connect H-shaped web members 7. An H-shaped jack matching the H-shaped web member 7 is provided in the H-shaped steel seat 3. The H-shaped web member 7 is inserted into the H-shaped jack of the corresponding H-shaped steel seat 3 and fixed by high-strength bolts. In this solution, the H-shaped web member 7 is a straight H-shaped web member and / or an inclined H-shaped web member, and the plurality of H-shaped steel seats 3 installed in the π-shaped gusset plate are used to butt against the straight H-shaped web member or the inclined H-shaped web member. The installation angle of the H-shaped steel seat 3 matches the setting angle of the H-shaped web member 7. To enhance the strength of the gusset plate, the H-shaped steel seat 3 is welded to the two vertical plates 2 in the π-shaped gusset plate.

[0039] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 9 As shown, the H-shaped steel seat 3 includes a web 31. Wing plates 32 are fixedly installed on both side walls of the web 31, and the web 31 and the two wing plates 32 form an H-shaped structure. A hollow cavity A 31a is opened on the web 31, and a hollow cavity B 32a is opened on the wing plate 32. The hollow cavity A 31a and the hollow cavity B 32a form an H-shaped jack for inserting the connection end of the H-shaped web member 7. A plurality of uniformly distributed butt-joint holes A 31b are opened on the web 31. A butt-joint hole B 7a is opened on the web flange of the connection end of the H-shaped web member 7. After the connection end of the H-shaped web member 7 is inserted into the H-shaped steel seat 3, it is fixedly connected by high-strength bolts passing through the butt-joint holes A 31b and the butt-joint holes B 7a.

[0040] It should be noted that: inserting the H-shaped web member 7 into the H-shaped jack opened in the H-shaped steel seat 3 realizes preliminary end butt-joint without the assistance of staff, reducing the cumbersome degree of butt-joint. Subsequently, high-strength bolts are used to pass through the butt-joint holes A 31b on the web 31 and the butt-joint holes B 7a opened at the connection end of the H-shaped web member 7 for fixation. Since the H-shaped web member 7 is butt-jointed with the gusset plate at the web 31, the number of butt-joint bolts and the bolt holes opened on the plate surface are reduced, thus reducing the high-stress risk around the hole walls, which is particularly beneficial to fatigue-sensitive areas (such as parts under dynamic load), and also avoiding excessive bolt holes from weakening the effective cross-section of the gusset plate and making the internal force transmission more direct.

[0041] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 ,Figure 8 And Figure 9 , a monitoring component 6 for warning the internal stress of the π-shaped gusset plate is provided in the H-shaped steel seat 3, and the monitoring component 6 is installed on the filling steel plate 5 provided in the H-shaped steel seat 3. The monitoring component 6 includes a tension sensor 64 for monitoring the stress between the H-shaped steel seat 3 and the H-shaped web member 7 and a gear 61 for transmitting stress. Installation cavities 32d for inserting the filling steel plate 5 are symmetrically formed on the two wing plates 32 of each H-shaped steel seat 3. One end of each installation cavity 32b communicates with the corresponding hollow B cavity 32a. The filling steel plate 5 is inserted into the corresponding installation cavity 32d and fixedly welded to the wing plate 32. And the filling steel plate 5 is located at the end of the installation cavity 32b that does not communicate with the hollow B cavity 32a. The width of the filling steel plate 5 is half of the width of the installation cavity 32d. As Figure 7 And Figure 8 shown, a waist cavity 5a is formed on the filling steel plate 5. The gear 61 is rotatably installed on the inner top wall of the waist cavity 5a through a bracket 611. An annular groove 61a is formed in the middle of the gear 61. A steel wire 62 is fixedly fitted in the annular groove 61a. The other end of the steel wire 62 bypasses the annular groove 61a for multiple turns and is fixedly connected to the connection end of the tension sensor 64. The bottom of the tension sensor 64 is fixedly installed with a middle connection plate 63 elastically connected to the inner bottom wall of the waist cavity 5a. A strong spring 65 is fixedly installed on the lower disc surface of the middle connection plate 63. And the other end of the strong spring 65 is fixedly connected to the inner bottom wall of the waist cavity 5a. A contact type signal transmitter 66 for transmitting a warning signal is fixedly installed on the inner bottom wall of the waist cavity 5a. And a contact column 67 for activating the contact type signal transmitter 66 is fixedly installed on the lower disc surface of the middle connection plate 63. The contact type signal transmitter 66 and the contact column 67 are both located in the inner ring of the strong spring 65. As Figure 9 shown, two steel ribs 72 are symmetrically provided on each H-shaped web member 7. And the two steel ribs 72 are both arranged in the middle of the flange plate of the H-shaped web member 7. A steel tooth part 721 for driving the gear 61 to rotate is arranged on each side of the steel rib 72. And the width of each side of the steel rib 72 and the steel tooth part 721 is half of the width of the installation cavity 32d. Thus, after the H-shaped web member 7 is inserted into the H-shaped jack of the corresponding H-shaped steel seat 3, the steel ribs 72 and the steel tooth parts 721 can fill the remaining cavity of the installation cavity 32d, and the steel tooth part 721 meshes with the gear 61.

[0042] It should be noted that: when the H-shaped web member 7 is inserted into the H-shaped socket opened in the H-shaped steel seat 3, the steel tooth portion 721 on the steel rib 72 drives the gear 61 to rotate, so that the steel wire 62 on the gear 61 is wound around the annular groove 61a and stretches the strong spring 65. When the node plate and the H-shaped web member 7 remain stable in the bridge installation area, the tension sensor 64 maintains a stable tension value and records the predetermined value range in the bridge design monitoring room. The web member, as the main load-bearing component of the truss, bears axial tension or pressure. The axial force is transmitted to the node plate through the connecting bolts and the steel tooth portion 721 and the gear 61, causing the node plate to generate axial tensile stress or compressive stress in the connection area.

[0043] When the H-shaped web 7 is driven by the dynamic energy caused by vehicle load, wind vibration and earthquake to cause stress side sliding with the H-shaped steel seat 3, the stress at the contact point between the steel tooth portion 721 on the H-shaped web 7 and the gear 61 is axial tensile stress or compressive stress. Since the contact surface between the steel tooth portion 721 and the gear 61 is small, and an annular groove 61a is provided in the gear 61, when the dynamic energy exceeds the predetermined value range, the gear 61 tooth will break in advance. Therefore, the elastic force of the strong spring 65 drives the value of the tension sensor 64 to exceed the predetermined value range line. After the cloud analysis platform of the control terminal in the bridge design monitoring room detects the change in the value of the tension sensor 64 in the node plate, it can be immediately inspected and repaired. In addition, the tension sensor 64 enables the staff to obtain the stress data of the connection part in real time, and can issue an early warning in time, allowing the staff to take measures before the structure is seriously damaged or fails.

[0044] If the stress generated between the H-shaped web member 7 and the node plate drives the steel wire 62 to break, the strong spring 65 drives the abutment column 67 on the lower plate of the central connecting plate 63 to abut against the contact-type signal transmitter 66, so that the contact-type signal transmitter 66 sends an emergency warning to the cloud analysis platform of the control terminal in the bridge design monitoring room. Therefore, the staff can immediately detect and repair it to avoid the steel truss from destroying the stability of the web member and the node plate due to stress, which greatly improves the early warning capability of bridge safety hazards, avoids the occurrence of major safety accidents such as bridge collapse, and protects the safety of life and property.

[0045] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 9, steel balls 4 are installed on both side walls of the H-shaped socket flange plate position of the H-shaped steel seat 3; specifically, insertion grooves 32b for inserting steel bars 71 are opened on the wing plates 32 on both sides of the hollow B cavity 32a, and cylindrical side grooves 32c are opened on both side groove walls of the insertion groove 32b, and a number of evenly distributed steel balls 4 are stored in each cylindrical side groove 32c, and one-third of the sphere of the steel ball 4 extends into the insertion groove 32b, and steel bars 71 in contact with the steel balls 4 are fixedly installed on both side walls of the flange plate at the connecting end of the H-shaped web 7, and arc cavities 71a are opened on both side walls of the steel bar 71, and the arc cavities 71a on both sides of the steel bar 71 are in rolling contact with the extended parts of the steel balls 4 at the corresponding positions respectively.

[0046] It should be noted that the steel bars 71 on the H-shaped web member 7 and the steel balls 4 built into the H-shaped steel seat 3 are in contact with each other, so that when the stress between the H-shaped steel seat 3 and the H-shaped web member 7 is transmitted to each other, it can be dispersed to the steel balls 4. The steel balls 4 can convert the sliding friction between the H-shaped web member 7 and the node plate into rolling friction, greatly reducing the friction coefficient and reducing the friction force. This helps to make the force of the H-shaped web member 7 more smoothly transmitted to the node plate when the structure is subjected to stress, reduce the energy loss and stress concentration caused by friction, and improve the overall mechanical properties of the structure. When the structure is under load, the steel balls 4 can play a certain buffering and regulating role between the node plate and the H-shaped web member 7, making the force distribution more uniform and avoiding excessive local stress. Especially in complex stress conditions, such as dynamic loads or multi-directional loads, the steel balls 4 can better adapt to changes in force and enhance the stability of the structure.

[0047] In the present embodiment, under the action of dynamic loads (such as vehicle loads, wind vibrations, and earthquakes), the steel ball 4 can play a certain role in energy dissipation and shock absorption. It can absorb and dissipate part of the seismic energy through rolling and slight displacement, reduce the vibration response between the H-shaped web member 7 and the node plate, and improve the seismic resistance of the node plate structure.

[0048] Furthermore, rubber gaskets 8 are fixedly embedded on both side walls of the hollow A cavity 31a opened on the web 31. The damping characteristics of the rubber gaskets 8 can absorb dynamic energy caused by vehicle loads, wind vibrations and earthquakes, reduce the vibration transmission rate between the node plate and the web, and weaken the loosening of high-strength bolts or fatigue cracking of welds caused by high-frequency vibrations.

[0049] In this embodiment, a fiber grating sensor (FBG) is embedded in the node plate to monitor strain, temperature and crack initiation in real time, and the data is wirelessly transmitted to a cloud analysis platform.

[0050] It is worth noting that the installation of the steel truss beam in the embodiment of the present invention is divided into two steps for construction:

[0051] Step 1: During the construction of the main girder, position and install the lower chord nodes of the steel truss girder, and embed the steel truss girder gusset plate into the main girder.

[0052] Step 2: After the concrete main girder is fully closed, use the steel truss girder for the full-bridge ballast. After the full-bridge linearity is measured and the cable forces are adjusted, loft the center line of the inclined web members of the steel truss girder on the lower chord nodes. After the field drilling of the node bolt holes is carried out according to the lofted center line, the web members, upper chord members, and lateral bracings of the steel truss girder are symmetrically installed on 4 working faces (as shown in the appendix Figure 10 and the appendix Figure 11 ).

[0053] A construction method for the structure of the steel truss girder node plate provided in the embodiment includes the following steps:

[0054] S1: After welding the bottom plate 1 and the vertical plate 2 to form a π-shaped gusset plate, add a tie plate 1-2 for reinforcement to form the gusset plate.

[0055] S2: Release the axis and elevation control points on the pier or temporary pier, set the settlement observation benchmark, use a total station to monitor the in-place accuracy of the gusset plate in real time, ensure that the plane deviation ≤ 3 mm, check the distance between adjacent gusset plates and the diagonal deviation, and fine-tune the position through a jack to ensure that the diagonal deviation ≤ L / 1500 and ≤ 10 mm, where L is the distance between adjacent gusset plates; the diagonal deviation is the deviation distance between the straight line between the center points of two adjacent gusset plates and the bridge axis.

[0056] S3: Determine the number of H-shaped web members 7 connected to each gusset plate according to the bridge design drawings, as well as the installation angle of each H-shaped web member 7. Weld the same number of H-shaped steel seats 3 as the number of H-shaped web members 7 in the gusset plate, and at the same time ensure that the welded H-shaped steel seats 3 match the installation angles of the H-shaped web members 7; there are vertical H-shaped web members and inclined H-shaped web members connected to each gusset plate. The vertical H-shaped web members are used to connect two symmetrically arranged upper and lower gusset plates, and the inclined H-shaped web members are used to connect two adjacent upper and lower gusset plates; and before each H-shaped steel seat 3 is welded to the gusset plate, insert the filling steel plate 5 fixed with the monitoring component 6 into the installation cavity 32d opened on the wing plate 32 correspondingly. Two sets of detection components 6 are symmetrically installed on each H-shaped steel seat 3. The tension sensor 64 and the contact type signal transmitter 66 of each monitoring component 6 are both in communication connection with the control system of the bridge design monitoring room. The tension sensor transmits signals to the system through the optical cable or radio wave between the system.

[0057] S4. After the H-shaped steel seat 3 is welded in the gusset plate, insert the connecting end of the H-shaped web member 7 into the H-shaped jack formed in the H-shaped steel seat 3. During the insertion process, insert the steel ribs 72 into the remaining chambers of the installation cavity 32d, and the steel teeth 721 on the steel ribs 72 engage with the gears 61 on the corresponding filling steel plates 5, driving the gears 61 to rotate and wind up the steel wires 62, so that the strong spring 65 stretches and the stable tensile force value detected by the tensile force sensor 64 is the predetermined value. At the same time, the steel bars 71 are inserted into the insertion grooves 32b and contact the built-in steel balls 4 to form a rolling connection. Input the predetermined value of each tensile force sensor 64 into the control system in the bridge design monitoring room. The control system in the bridge design monitoring room monitors each tensile force sensor in the gusset plate in real time, and compares the real-time monitoring value with the input predetermined value. When the real-time monitored tensile force value is equal to or greater than the predetermined value, a warning signal is issued.

[0058] S5. After the insertion of the H-shaped web member 7 on the gusset plate is completed, fix the H-shaped web member 7 to the gusset plate with high-strength bolts.

[0059] S6. Number the contact type signal transmitters 66 in each gusset plate in the bridge design monitoring room, so that when the contact type signal transmitter 66 emits a signal, it can be quickly known which section of the gusset plate has problems, facilitating timely maintenance by the staff.

[0060] The circuits and controls involved in the present invention are all prior arts and will not be elaborated here.

[0061] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A bridge steel truss gusset plate structure, comprising a bottom plate (1), two symmetrically distributed vertical plates (2) are fixedly welded to the bottom plate (1), and the bottom plate (1) and the two vertical plates (2) form a π-shaped gusset plate, and a plurality of symmetrically distributed tension plates (1-2) are fixedly installed between the bottom plate (1) and the two vertical plates (2), characterized in that: A plurality of H-shaped steel seats (3) are installed in the π-shaped gusset plate, each H-shaped steel seat (3) is installed with an H-shaped web member (7) via high-strength bolts, and a monitoring component (6) for early warning of internal stress of the π-shaped gusset plate is provided in each H-shaped steel seat (3); A filling steel plate (5) is installed in the wing plate of the H-shaped steel seat (3), the monitoring assembly (6) is installed on the filling steel plate (5), and the monitoring assembly (6) comprises a tension sensor (64) for monitoring the stress between the H-shaped steel seat (3) and the H-shaped web (7) and a gear (61) for transmitting the stress, the gear (61) being rotatably installed on the filling steel plate (5) and connected to the tension sensor (64) via the force transmission assembly; The H-shaped steel seat (3) is provided with an H-shaped socket matching the H-shaped web (7), and steel balls (4) are installed on both side walls of the flange plate position of the H-shaped socket. Steel bars (71) in contact with the steel balls (4) are fixedly installed on both side walls of the flange plate at the connection end of the H-shaped web (7) and the H-shaped steel seat (3). The outer plate wall of the flange plate where the H-shaped web (7) is inserted into the H-shaped socket is fixedly engaged with a steel rib (72), and the steel rib (72) is provided with a steel tooth portion (721) for driving the gear (61) to rotate. The H-shaped web (7) is inserted into the H-shaped socket of the corresponding H-shaped steel seat (3), and the steel bar (71) on each side thereof rolls in contact with the steel ball (4) on the corresponding side, and the steel tooth portion (721) and the gear (61) are meshed with each other.

2. A bridge steel truss gusset plate structure according to claim 1, characterized in that: A waist cavity (5a) is provided on the filling steel plate (5), and the gear (61) is rotatably mounted on the inner top wall of the waist cavity (5a) through a bracket (611), and an annular groove (61a) is provided in the middle of the gear (61), and a steel wire (62) is fixedly embedded in the annular groove (61a), and the other end of the steel wire (62) passes around the annular groove (61a) for multiple turns and is fixedly connected to the connecting end of the tension sensor (64), and a central connecting plate (63) elastically connected to the inner bottom wall of the waist cavity (5a) is fixedly installed at the bottom of the tension sensor (64).

3. A bridge steel truss gusset plate structure according to claim 1 or 2, characterized in that: Each H-shaped steel seat (3) is an H-shaped structure consisting of a web (31) and wing plates (32) fixedly connected to both ends of the web (31); the web (31) is provided with a hollow A cavity (31a); the two wing plates (32) are symmetrically provided with hollow B cavities (32a); the hollow A cavity (31a) and the hollow B cavity (32a) constitute an H-shaped socket for inserting the connecting end of the H-shaped web rod (7); the two wing plates (32) of each H-shaped steel seat (3) are symmetrically provided with mounting cavities (32d) for inserting the filling steel plate (5); one end of each mounting cavity (32b) is connected to the corresponding hollow B cavity (32a); the filling steel plate (5) is inserted into the corresponding mounting cavity (32d) and fixedly welded to the wing plate (32). 32), and the filling steel plate (5) is located at the end of the installation cavity (32b) that is not connected to the hollow B cavity (32a), and the width of the filling steel plate (5) is half the width of the installation cavity (32d); two steel ribs (72) are symmetrically arranged on each H-shaped web member (7), and the two steel ribs (72) are arranged in the middle of the flange plate of the H-shaped web member (7), and the width of the steel rib (72) and the steel tooth portion (721) on each side is half the width of the installation cavity (32d), and after the H-shaped web member (7) is inserted into the H-shaped socket of the corresponding H-shaped steel seat (3), the steel ribs (72) and the steel tooth portion (721) on both sides are correspondingly inserted into the connecting end between the installation cavity (32d) and the hollow B cavity (32a), and the steel tooth portion (721) is meshed with the gear (61).

4. A bridge steel truss gusset plate structure according to claim 2, characterized in that: A strong spring (65) is fixedly mounted on the lower disk surface of the middle connecting disk (63), and the other end of the strong spring (65) is fixedly connected to the inner bottom wall of the waist cavity (5a).

5. The bridge steel truss gusset plate structure according to claim 3, characterized in that: Insertion grooves (32b) for inserting steel bars (71) are provided on both inner walls of each hollow B cavity (32a) of the H-shaped steel seat (3), and columnar side grooves (32c) are provided on both inner walls of the insertion grooves (32b). A plurality of evenly distributed steel balls (4) are stored in each columnar side groove (32c), and one third of the sphere of the steel ball (4) extends into the insertion groove (32b). Arc-shaped cavities (71a) are provided on both inner walls of the steel bars (71) on each side of the H-shaped web rod (7). When the H-shaped web rod (7) is inserted into the corresponding H-shaped steel seat (3), the arc-shaped cavities (71a) on both sides of the steel bars (71) respectively roll in contact with the extended portions of the steel balls (4) at the corresponding positions.

6. The bridge steel truss gusset plate structure according to claim 3, characterized in that: A plurality of evenly distributed butt joint A holes (31b) are provided on the web (31) of each H-shaped steel seat (3), and rubber gaskets (8) with through holes are fixedly embedded on both side walls of the hollow A cavity (31a) provided on the web (31); a plurality of butt joint B holes (7a) are correspondingly provided on the web edge plate of the connecting end of the H-shaped web bar (7), and the connecting end of the H-shaped web bar (7) is inserted into the H-shaped steel seat (3) and fixedly connected by high-strength bolts passing through the butt joint A holes (31b) and the butt joint B holes (7a).

7. The bridge steel truss gusset plate structure according to claim 4, characterized in that: A contact-type signal transmitter (66) for transmitting an early warning signal is fixedly mounted on the inner bottom wall of the waist cavity (5a), and an abutment column (67) for starting the contact-type signal transmitter (66) is fixedly mounted on the lower disk surface of the central coupling disk (63), wherein the contact-type signal transmitter (66) and the abutment column (67) are both located in the inner circle of the strong spring (65); the tension sensor (64) and the contact-type signal transmitter (66) of each monitoring component (6) are both communicatively connected to the control system of the bridge design monitoring room.

8. A construction method for a bridge steel truss gusset plate structure according to any one of claims 4 and 7, characterized in that: The specific steps include: S1, after welding the bottom plate (1) and the vertical plate (2) to form a π-shaped node plate, a tension plate (1-2) is added to reinforce and form the node plate; S2. Place the axis and elevation control points on the pier or temporary pier, set the settlement observation benchmark, use the total station to monitor the positioning accuracy of the node plate in real time, ensure that the plane deviation is ≤3mm, check the spacing and diagonal deviation of adjacent node plates, and fine-tune the position by jack to ensure that the diagonal deviation is ≤L / 1500 and ≤10mm, where L is the spacing between adjacent node plates; the diagonal deviation is the deviation spacing between the straight line between the center points of two adjacent node plates and the bridge axis; S3. Determine the number of H-shaped web members (7) connected to each node plate and the installation angle of each H-shaped web member (7) according to the bridge design drawings, weld the same number of H-shaped steel seats (3) as the number of H-shaped web members (7) in the node plate, and ensure that the installation angles of the welded H-shaped steel seats (3) and the H-shaped web members (7) match each other; and before each H-shaped steel seat (3) is welded to the node plate, install the filling steel plate (5) and the monitoring component (6) in the corresponding H-shaped steel seat (3), and the tension sensor (64) of each monitoring component (6) is connected to the control system of the bridge design monitoring room; S4. After the H-shaped steel seat (3) is welded in the node plate, the connecting end of the H-shaped web member (7) is inserted into the H-shaped socket provided in the H-shaped steel seat (3). During the insertion process, the steel rib (72) at the connecting end of the H-shaped web member (7) contacts the monitoring component (6) on the filling steel plate (5), and the steel teeth (721) on the steel rib (72) mesh with the gear (61), and drive the gear (61) to rotate and reel in the steel wire (62), so that the strong spring (65) is stretched and the stable tension value detected by the tension sensor (64) is the predetermined value. At the same time, the steel bar (71) contacts the steel ball (4) in the H-shaped socket to form a rolling connection; S5. After the H-shaped web member (7) on the node plate is inserted and connected, the H-shaped web member (7) and the node plate are fixed with high-strength bolts.

9. The construction method of a bridge steel truss gusset plate structure according to claim 8, characterized in that: A contact-type signal transmitter (66) is installed on the filling steel plate (5) of each H-shaped steel seat (3), and the plurality of contact-type signal transmitters (66) are all connected to the control system in the bridge design monitoring room. The predetermined value of each tension sensor (64) in step S4 is input into the control system in the bridge design monitoring room. The tension sensor in each node plate is monitored in real time by the control system in the bridge design monitoring room, and the real-time monitoring value is compared with the input predetermined value. When the real-time monitored tension value is equal to or greater than the predetermined value, an early warning signal is issued. The contact-type signal transmitters (66) in each node plate are numbered in the control system of the bridge design monitoring room. When the contact-type signal transmitter (66) transmits a signal, it can be quickly determined which node plate has a problem.

10. The construction method of a bridge steel truss gusset plate structure according to claim 8, characterized in that: In the step S3, each node plate in the bridge design is connected with a vertical H-shaped web and an oblique H-shaped web, the vertical H-shaped web is used to connect two node plates that are symmetrical up and down, and the oblique H-shaped web is used to connect two node plates that are adjacent to each other up and down; and before the H-shaped steel seat (3) is installed, the filling steel plate (5) fixed with the monitoring component (6) is inserted into the corresponding installation cavity (32d) opened on the wing plate (32), and two sets of detection components (6) are symmetrically installed on each H-shaped steel seat (3); in the step S4, the steel rib (72) is inserted into the remaining cavity of the installation cavity (32d), and the steel tooth portion (721) on the steel rib (72) is meshed with the gear (61) on the corresponding filling steel plate (5), and the steel bar (71) is inserted into the insertion groove (32b) and contacts with the built-in steel ball (4).

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