Bridge steel truss girder gusset plate structure and construction method thereof

Abstract

The invention relates to the technical field of bridge engineering, in particular to a bridge steel truss girder gusset plate structure and a construction method thereof. The bridge steel truss gusset plate structure comprises a pi-shaped gusset plate formed by a bottom plate and a vertical plate, a plurality of H-shaped steel bases are installed in the pi-shaped gusset plate, each H-shaped steel base is provided with an H-shaped web member through a high-strength bolt, and a monitoring assembly used for early warning of internal stress of the pi-shaped gusset plate is arranged in each H-shaped steel base. The monitoring assembly comprises a tension sensor used for monitoring stress between the H-shaped steel base and the H-shaped web member and a gear used for transmitting the stress, a steel rib is correspondingly arranged at the insertion end of the H-shaped web member, and a steel tooth part used for driving the gear to rotate is arranged on the steel rib. The tension sensor arranged in the gusset plate can obtain stress data of the connecting part in real time, the data can enable workers to take measures before the structure is seriously damaged or fails, and the early warning capacity of bridge potential safety hazards is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering node plate structures, and in particular to a bridge steel truss node plate structure and a construction method thereof. Background Art

[0002] The node plates of steel trusses of bridges are of various types, such as external attachment type, internal insertion type, integral type, etc. In large-span steel truss bridges, integral node plates are generally used to ensure reliability and connection strength. Since the nodes concentrate various structures of steel trusses and the force is relatively complex, the stress distribution between the node plates and the webs is uneven. In addition, since there is basically sliding contact between the node plates and the webs, the plate surfaces between the two are severely worn and stress is concentrated. Under repeated loads (such as vehicle loads and wind vibration), fatigue damage is prone to occur in the stress concentration area, and fatigue crack propagation may significantly reduce the safety performance of the node plates. However, it is difficult for monitoring personnel to know the hidden dangers of node plate damage in a timely manner, resulting in the inability to send emergency warnings after stress damage occurs between the node plates and the webs of the bridge.

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

[0004] In order to solve the above technical problems, the present invention provides a bridge steel truss node plate structure and a construction method thereof. The node plate structure can obtain stress data of the connection parts in real time, thereby improving the early warning capability of the bridge.

[0005] In order to achieve the above technical objectives, the present invention provides a bridge steel truss girder node plate structure, comprising a bottom plate, two symmetrically distributed vertical plates are fixedly welded on the bottom plate, and the bottom plate and the two vertical plates constitute a π-type node plate, a plurality of symmetrically distributed tension 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-type node plate, each H-shaped steel seat is installed with an H-shaped web member through a high-strength bolt, and a monitoring component for early warning of internal stress of the π-type node plate is provided in each H-shaped steel seat;

[0006] A filling steel plate is installed in the wing plate of the H-shaped steel seat, and 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 and a gear for transmitting stress. The gear is rotatably installed on the filling steel plate and connected to the tension sensor through the force transmission component; an H-shaped socket matching the H-shaped web is provided in the H-shaped steel seat, and steel balls are installed on both side walls of the flange plate position of the H-shaped socket, and steel bars in contact with the steel balls are fixedly installed on both side walls of the flange plate at the connection end of the H-shaped web and the H-shaped steel seat, and steel ribs are fixedly embedded in the outer plate wall of the flange plate where the H-shaped web is inserted into the H-shaped socket, and steel teeth for driving the gear to rotate are provided on the steel ribs, and the H-shaped web is inserted into the H-shaped socket of the corresponding H-shaped steel seat, and the steel bars on each side are in rolling contact with the steel balls on the corresponding side, and the steel teeth are meshed with the gears.

[0007] A better technical solution of the present invention is as follows: 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, and 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 passes around the annular groove for multiple turns and is fixedly connected to the connecting end of the tension sensor, and a central connecting plate elastically connected to the inner bottom wall of the waist cavity is fixedly installed at the bottom of the tension sensor.

[0008] The preferred technical solution of the present invention is as follows: each H-shaped steel seat is an H-shaped structure consisting of a web and wing plates fixedly connected to both ends of the web, the web is provided with a hollow A cavity, and the two wing plates are symmetrically provided with hollow B cavities, the hollow A cavity and the hollow B cavity constitute an H-shaped jack for inserting the connecting end of the H-shaped web rod; the two wing plates of each H-shaped steel seat are symmetrically provided with installation cavities for inserting the filling steel plates, one end of each installation cavity is connected to the corresponding hollow B cavity, and the filling steel plate is inserted into the corresponding installation cavity It is fixedly welded on the wing plate, and the filling steel plate is located at the end of the installation cavity that is not connected to the hollow B cavity, and the width of the filling steel plate is half of the width of the installation cavity; each H-shaped web is symmetrically provided with two steel ribs, and the two steel ribs are arranged in the middle of the flange plate of the H-shaped web, and the width of the steel ribs and steel teeth on each side is half of the installation cavity, and after the H-shaped web is inserted into the H-shaped socket of the corresponding H-shaped steel seat, the steel ribs and steel teeth on both sides are correspondingly inserted into the connecting end between the installation cavity and the hollow B cavity, and the steel teeth are meshed with the gears.

[0009] A more preferred technical solution of the present invention is as follows: a strong spring is fixedly installed on the lower disk surface of the central connecting disk, and the other end of the strong spring is fixedly connected to the 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 node plate and the installation angle of each H-shaped web member according to the bridge design drawings, weld the same number of H-shaped steel seats as the H-shaped web members in the node plate, and ensure that the installation angles of the welded H-shaped steel seats match those of the H-shaped web members; and before each H-shaped steel seat is welded to the node plate, install the filling steel plate and the monitoring assembly in the corresponding H-shaped steel seat, and the tension sensor of each monitoring assembly is connected to the control system of the bridge design monitoring room;

[0017] S4. After the H-shaped steel seat is welded in the node plate, the connecting end of the H-shaped web is inserted into the H-shaped socket opened in the H-shaped steel seat. During the insertion process, the steel ribs at the connecting end of the H-shaped web contact the monitoring component on the filling steel plate, and the steel teeth on the steel ribs mesh with the gears, and drive the gears to rotate and reel in the steel wire, so that the strong spring is stretched and the stable tension value detected by the tension sensor is the predetermined value. At the same time, the steel bar contacts the steel ball in the H-shaped socket to form a rolling connection;

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

[0019] The preferred technical solution of the present invention is as follows: a touch-type signal transmitter is installed on the filling steel plate of each H-shaped steel seat, and multiple touch-type signal transmitters are all connected to the control system in the bridge design monitoring room for communication. The predetermined value of each tension sensor 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; and the touch-type signal transmitters in each node plate are numbered in the control system of the bridge design monitoring room, so that when the touch-type signal transmitter transmits a signal, it can quickly determine which node plate has a problem.

[0020] A better technical solution of the present invention: 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 is installed, the filling steel plate fixed with the monitoring component is inserted into the corresponding installation cavity opened on the wing plate, and two sets of detection components are symmetrically installed on each H-shaped steel seat; in the step S4, the steel rib is inserted into the remaining chamber of the installation cavity, and the steel tooth portion on the steel rib is meshed with the gear on the corresponding filling steel plate, and the steel bar is inserted into the insertion groove and contacts with the built-in steel ball.

[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 is driven to have stress side sliding with the H-shaped steel seat due to the dynamic energy caused by vehicle load, wind vibration and earthquake, the tension sensor can obtain the stress data of the connection part in real time, so that the staff can take measures before the structure is seriously damaged or fails. If the steel wire is broken due to dynamic energy, the contact-type signal transmitter sends an emergency warning to the cloud analysis platform of the control terminal in the bridge design monitoring room, 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 lives and property of personnel;

[0023] 2. The present invention arranges steel balls in the H-shaped web and the node plate to convert the sliding friction between the H-shaped web and the node plate into rolling friction, which greatly reduces the friction coefficient and the friction force. This helps to transfer the force of the H-shaped web to the node plate more smoothly when the structure is subjected to stress, thereby reducing the energy loss and stress concentration caused by friction and improving the overall mechanical properties of the structure. Under the action of dynamic loads (such as vehicle loads, wind vibrations and earthquakes), the steel balls can play a certain energy dissipation and shock absorption role. They can absorb and dissipate a part of the seismic energy through rolling and slight displacement, reduce the vibration response between the H-shaped web and the node plate, and improve the seismic resistance of the node plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 for Figure 1 The schematic diagram of the installation structure of the H-shaped steel seat on the vertical plate is shown;

[0026] Figure 3 for Figure 2 The schematic diagram of the installation structure of the filling steel plate in the H-shaped steel seat is shown;

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

[0028] Figure 5 for Figure 4 The schematic diagram of the top view of the H-shaped steel seat shown;

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

[0030] Figure 7 for Figure 4 The second schematic diagram of the cross-sectional structure of the H-shaped steel seat wing plate shown;

[0031] Figure 8 for Figure 7The schematic diagram of the installation structure of the monitoring component on the filling steel plate is shown;

[0032] Fig. 9 for Figure 1 The structural schematic diagram of the H-shaped web is shown;

[0033] Fig.10 A schematic diagram of the structure of the connection between the node plate and the H-shaped web member in the node plate structure of the bridge steel truss provided by the present invention;

[0034] Fig.11 A schematic diagram of the planar structure of the connection between the bridge steel truss node plate structure and the H-shaped web member provided by the present invention.

[0035] Numbers in the figure: 1. bottom plate; 2. vertical plate; 1-2. tension plate; 3. H-shaped steel seat; 31. web plate; 31a. hollow A cavity; 31b. docking A hole; 32. wing plate; 32a. hollow B cavity; 32b. insertion groove; 32c. cylindrical side groove; 32d. installation cavity; 4. steel ball; 5. filling steel plate; 5a. waist cavity; 6. monitoring component; 61. gear; 61a. annular groove; 611. bracket; 62. steel wire; 63. center link plate; 64. tension sensor; 65. strong spring; 66. contact-type signal transmitter; 67. abutment column; 7. H-shaped web rod; 7a. docking B hole; 71. steel bar; 71a. arc cavity; 72. steel rib; 721. steel tooth; 8. rubber gasket. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0037] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0038] See also Figures 1 to 11A bridge steel truss node plate structure provided by an embodiment of the present invention comprises a bottom plate 1, on which two symmetrically distributed vertical plates 2 are fixedly welded, and the bottom plate 1 and the two vertical plates 2 form a π-type node 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, so as to increase the connection stability of the bottom plate 1 and the two vertical plates 2 and enhance the connection strength of the π-type node plate, and a plurality of H-shaped steel seats 3 are installed in the π-type node plate, and the H The steel seat 3 is used to connect the H-shaped web 7. The H-shaped steel seat 3 is provided with an H-shaped socket matching the H-shaped web 7. The H-shaped web 7 is inserted into the H-shaped socket corresponding to the H-shaped steel seat 3 and fixed by high-strength bolts. In this solution, the H-shaped web 7 is a straight H-shaped web and / or an oblique H-shaped web, and the multiple H-shaped steel seats 3 installed in the π-shaped node plate are used to connect the straight H-shaped web or the oblique H-shaped web. The installation angle of the H-shaped steel seat 3 matches the setting angle of the H-shaped web 7. In order to enhance the strength of the node plate, the H-shaped steel seat 3 is welded to the two vertical plates 2 in the π-shaped node plate.

[0039] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 and Fig. 9 As shown, the H-shaped steel seat 3 includes a web 31, and the two side wall plates of the web 31 are fixedly installed with wing plates 32, and the web 31 and the two wing plates 32 form an H-shaped structure, the web 31 is provided with a hollow A cavity 31a, and the wing plate 32 is provided with a hollow B cavity 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, and the web 31 is provided with a plurality of evenly distributed docking A holes 31b, and the web edge plate of the connecting end of the H-shaped web rod 7 is provided with a docking B hole 7a, and after the connecting end of the H-shaped web rod 7 is inserted into the H-shaped steel seat 3, it is fixedly connected by high-strength bolts passing through the docking A hole 31b and the docking B hole 7a.

[0040] It should be noted that: the H-shaped web member 7 is inserted into the H-shaped socket opened in the H-shaped steel seat 3 to achieve preliminary end docking, without the assistance of staff, reducing the complexity of docking, and subsequently fixed with high-strength bolts passing through the docking A hole 31b on the web 31 and the docking B hole 7a opened at the connecting end of the H-shaped web member 7. Since the H-shaped web member 7 and the node plate are docked at the web 31, the docking bolts and the bolt holes opened on the plate surface are reduced, thereby reducing the risk of high stress around the hole wall, which is especially beneficial to fatigue-sensitive areas (such as dynamic load action areas), and also avoids too many bolt holes from weakening the effective cross-section of the node plate, making the internal force transmission more direct.

[0041] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 The H-beam seat 3 is provided with a monitoring component 6 for early warning of the internal stress of the π-shaped node plate, and the monitoring component 6 is installed on the filling steel plate 5 provided in the H-beam seat 3. The monitoring component 6 includes a tension sensor 64 for monitoring the stress between the H-beam seat 3 and the H-shaped web 7, and a gear 61 for transmitting stress. The two wing plates 32 of each H-beam seat 3 are symmetrically provided with installation cavities 32d for inserting the filling steel plates 5. One end of each installation cavity 32b is connected to 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. 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. The width of the filling steel plate 5 is half the width of the installation cavity 32d. Figure 7 and Figure 8 As shown, a waist cavity 5a is provided on the filling steel plate 5, and a 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 through the annular groove 61a for multiple turns and is fixedly connected to the connecting end of the tension sensor 64, and a middle connecting disk 63 elastically connected to the inner bottom wall of the waist cavity 5a is fixedly installed on the bottom of the tension sensor 64, and a strong spring 65 is fixedly installed 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, and a contact-type signal transmitter 66 for transmitting an early warning signal is fixedly installed 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 installed on the lower disk surface of the middle connecting disk 63, and the contact-type signal transmitter 66 and the abutment column 67 are both located in the inner circle of the strong spring 65. As shown Fig. 9 As shown, two steel ribs 72 are symmetrically provided on each H-shaped web 7, and the two steel ribs 72 are both arranged in the middle of the flange plate of the H-shaped web 7, and a steel tooth portion 721 for driving the gear 61 to rotate is provided on each side of the steel rib 72, and the width of the steel rib 72 and the steel tooth portion 721 on each side is half of the installation cavity 32d; thus, after the H-shaped web 7 is inserted into the H-shaped socket of the corresponding H-shaped steel seat 3, the steel rib 72 and the steel tooth portion 721 can fill the remaining volume of the installation cavity 32d, and the steel tooth portion 721 and the gear 61 are meshed with each other.

[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 Fig. 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 main beam construction process, the lower chord node of the steel truss is positioned and installed, and the node plate of the steel truss is embedded in the main beam;

[0052] Step 2: After the concrete main beam is fully connected, the steel truss is used to weigh the entire bridge. After the entire bridge is linearly measured and the cable tension is adjusted, the center line of the steel truss diagonal web member is set out at the lower chord node. The node bolt holes are drilled on site according to the set out center line. After the drilling is completed, the steel truss web member, upper chord member, and flat joint are installed symmetrically on four working surfaces (as shown in the attached figure). Fig.10 And attached Fig.11 as shown).

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

[0054] S1. After the bottom plate 1 and the vertical plate 2 are welded to form a π-shaped node plate, a tension plate 1-2 is added to reinforce and form a node plate.

[0055] S2. Lay out the axis and elevation control points on the piers or temporary piers, set the settlement observation benchmark, use the total station to monitor the node plate positioning accuracy 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 with the 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.

[0056] S3. Determine the number of H-shaped webs 7 connected to each node plate and the installation angle of each H-shaped web 7 according to the bridge design drawings, weld the same number of H-shaped steel seats 3 as the H-shaped webs 7 in the node plate, and ensure that the installation angles of the welded H-shaped steel seats 3 match those of the H-shaped webs 7; each node plate 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 symmetrical up and down, and the oblique H-shaped web is used to connect two node plates adjacent to each other up and down; and before each H-shaped steel seat 3 is welded to the node plate, insert the filling steel plate 5 fixed with the monitoring component 6 into the corresponding installation cavity 32d opened on the wing plate 32, and symmetrically install two sets of detection components 6 on each H-shaped steel seat 3, and the tension sensor 64 and the contact-type signal transmitter 66 of each monitoring component 6 are both connected to the control system of the bridge design monitoring room for communication, and the tension sensor transmits the signal to the system through the optical cable or radio wave transmission signal between the system.

[0057] S4. After the H-shaped steel seat 3 is welded in the node plate, the connecting end of the H-shaped web 7 is inserted into the H-shaped socket opened in the H-shaped steel seat 3, and during the insertion process, 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 drives 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 is inserted into the insertion groove 32b and contacts with the built-in steel ball 4 to form a rolling connection; the predetermined value of each tension sensor 64 is input into the control system in the bridge design monitoring room, and 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.

[0058] 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.

[0059] S6. In the bridge design monitoring room, the contact-type signal transmitters 66 in each node plate are numbered so that when the contact-type signal transmitter 66 transmits a signal, it is possible to quickly know which section of the node plate has a problem, which is convenient for the staff to perform maintenance in a timely manner.

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

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also 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 1 to 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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