Pushing force measuring control device for rigid frame bridge

Abstract

The utility model belongs to bridge construction technical field discloses a kind of rigid frame bridge pushing force measurement control device, two groups of pushing force execution component are set in closure section, and along the center line symmetry of bridge extension direction is set, pressure sensor and displacement sensor are set on the jack of pushing force execution component, pressure sensor is configured to detect the pushing force output by jack, displacement sensor is configured to detect the pushing displacement of piston rod;Rigid frame bridge girder bottom and rigid frame bridge pier column are pasted with strain fiber network by fiber matrix, configured to measure the distributed strain of rigid frame bridge girder and rigid frame bridge pier column surface;Integrated control component is connected with pressure sensor, displacement sensor and strain fiber network communication, configured to receive pushing force data, displacement data and distributed stress data and control the start-stop of jack.The utility model can measure pushing force and monitor the stress distribution of girder and pier column, so as to regulate pushing force in process.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a device for measuring and controlling the thrust at the top of a rigid frame bridge. Background Technology

[0002] In the cantilever construction of prestressed concrete rigid frame bridges, the construction of the closure segment is a crucial step determining the quality and long-term performance of the completed bridge. To optimize the internal force state of the completed bridge, a jacking process is typically implemented before closure. This involves using jacking equipment to apply a pair of horizontal forces to the main beam structures on both sides of the closure segment, causing them to generate predetermined displacements and internal forces before closure. The core purpose of this process is to actively intervene to ensure that the closure segment remains under the expected compression state after the bridge is completed, thereby effectively improving the bridge's stress performance and enhancing its durability and ride comfort.

[0003] Currently, this technology mainly relies on the traditional jacking construction method in engineering practice. This method typically involves operators manually adjusting the pump station pressure based on their on-site experience and by observing the readings of the mechanical pressure gauges attached to the jacks, thereby achieving approximate control of the jacking force. The entire construction process involves unidirectional force application based on a preset jacking force value, and the recording of the jacking force largely depends on manual transcription.

[0004] However, this method, which relies on manual labor and experience, is highly subjective and lacks precision. Uneven or deviated thrust can easily lead to poor main beam alignment or unfavorable stress on piers. More importantly, because it is impossible to obtain the true strain distribution of key parts of the main beam and pier during construction, there is a dual risk: excessive thrust can cause localized crushing of the concrete in the piers or main beam, while insufficient thrust can result in substandard prestressing levels in the closure section, leading to long-term deflection of the main beam.

[0005] Therefore, there is an urgent need to develop a device for measuring and controlling the thrust at the top of a rigid frame bridge to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a device for measuring and controlling the jacking force of a rigid frame bridge. This device can not only measure the jacking force but also monitor the strain distribution of the main beam and piers of the rigid frame bridge, dynamically regulate the jacking force, avoid damage to the bridge structure due to improper jacking, and improve construction quality.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] The rigid frame bridge thrust measurement and control device includes:

[0009] Two sets of jacking force actuators are installed at the closure sections of two adjacent rigid frame bridge main beams and are symmetrically arranged along the centerline of the bridge extension direction. Each set of jacking force actuators includes a jack and a support frame. One end of the support frame abuts against one of the rigid frame bridge main beams, and the other end is connected to the jack. The piston rod of the jack can push the other rigid frame bridge main beam. The jack is equipped with a pressure sensor and a displacement sensor. The pressure sensor is configured to detect the jacking force output by the jack, and the displacement sensor is configured to detect the jacking displacement of the piston rod.

[0010] Four sets of fiber mesh strain measurement components are respectively installed at the bottom of the two main beams of the rigid frame bridge and on the two piers of the rigid frame bridge. Each set of fiber mesh strain measurement components includes a strain fiber mesh and a fiber matrix. The strain fiber mesh is attached to the surface of the main beam of the rigid frame bridge or the surface of the pier through the fiber matrix and is configured to measure the distributed strain on the surface of the main beam of the rigid frame bridge and the pier.

[0011] An integrated control component, which is communicatively connected to the pressure sensor, the displacement sensor, and the strain fiber mesh, is configured to receive jacking force data, displacement data, and distributed strain data, and to control the start and stop of the jack.

[0012] Preferably, the strain fiber mesh includes multiple parallel transverse strain fibers and multiple parallel longitudinal strain fibers, with the transverse strain fibers arranged orthogonally to the longitudinal strain fibers, and is bonded and fixed to the surface of the main beam of the rigid frame bridge or the pier column of the rigid frame bridge through the fiber matrix.

[0013] Preferably, the strain fiber mesh is a long strip structure with a width of 0.45m-0.6m, and the grid unit formed by the transverse strain fiber and the longitudinal strain fiber is square with a side length of 15cm-25cm.

[0014] Preferably, the fiber mesh strain measurement component disposed on the surface of the rigid frame bridge pier is 0.4m-0.6m away from the bottom surface of the main beam of the rigid frame bridge.

[0015] Preferably, the fiber mesh strain measurement component installed on the bottom of the main beam of the rigid frame bridge is 0.1m-0.12m away from the end of the main beam of the rigid frame bridge near the closure section.

[0016] Preferably, the support frame includes a support rod and two support plates, the two support plates being fixedly connected to both ends of the support rod, one end of the support plate abutting against the main beam of the rigid frame bridge, and the other end of the support plate being connected to the jack.

[0017] Preferably, the surface of the support plate that contacts the main beam of the rigid frame bridge is provided with anti-slip texture or is equipped with an anti-slip mat.

[0018] Preferably, the fiber matrix is ​​a flexible composite material with a thickness of 1mm-3mm.

[0019] The beneficial effects of this utility model are:

[0020] This invention proposes a thrust measurement and control device for rigid frame bridges. Two sets of thrust actuators symmetrically arranged along the centerline of the bridge's extension direction ensure balanced force distribution through structural layout. Furthermore, the pressure sensor equipped on the jacks can detect the output thrust in real time, while the displacement sensor synchronously captures the thrust displacement of the piston rod. Both thrust and piston rod displacement data are fed back to the integrated control components in real time. This not only eliminates subjective errors from manual observation but also obtains continuous and accurate thrust and displacement data, avoiding thrust deviations caused by adjusting pump station pressure based on experience. It also eliminates the need for manual data recording. This reduces data recording errors and delays. Furthermore, by installing fiber mesh strain measurement components at the bottom of the main beam and on the surface of the piers of the rigid frame bridge, the distributed strain on the structural surface can be measured via the strain fiber mesh. This data can reflect the stress state of the main beam and piers during the jacking process in real time. When the jacking force is too large, the strain of the main beam or pier will exceed the normal range; when the jacking force is insufficient, the strain will not reach the expected standard. This ensures that construction personnel can clearly understand the structural stress and effectively avoid problems such as localized concrete damage and insufficient prestressing caused by abnormal strain. In addition, the integrated control component can centrally receive jacking force, displacement, and distributed strain data. When data anomalies occur, such as the jacking force exceeding a preset threshold or strain data showing excessive structural stress, the integrated control component can promptly issue commands to stop the jacking, thus quickly responding to abnormal situations during construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the arrangement of the rigid frame bridge thrust measurement and control device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram showing the connection between the push force execution component and the signal transmitter according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the strain fiber mesh structure described in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection between the strain fiber mesh and the signal transmitter according to an embodiment of the present invention;

[0025] Figure 5This is a schematic diagram showing the connection between the signal transmitter and the controller described in an embodiment of this utility model.

[0026] In the picture:

[0027] 1. Top thrust actuator; 11. Jack; 12. Support frame; 121. Support rod; 122. Support plate;

[0028] 2. Fiber mesh strain measurement assembly; 21. Strain fiber mesh; 211. Transverse strain fiber; 212. Longitudinal strain fiber; 22. Fiber matrix;

[0029] 3. Integrated control components; 31. Signal transmitter; 32. Controller;

[0030] 100. Main beam of rigid frame bridge;

[0031] 200. Rigid frame bridge piers. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1-5 As shown, this utility model provides a thrust measurement and control device for rigid frame bridges, including a thrust execution component 1, a fiber mesh strain measurement component 2, and an integrated control component 3. Two sets of thrust execution components 1 are arranged at the closure sections of two adjacent main beams 100 of the rigid frame bridge, symmetrically arranged along the centerline of the bridge's extension direction. Each set of thrust execution components 1 includes a jack 11 and a support frame 12. One end of the support frame 12 abuts against one of the main beams 100 of the rigid frame bridge, and the other end is connected to the jack 11. The piston rod of the jack 11 can push the other main beam 100 of the rigid frame bridge. The jack 11 is equipped with a pressure sensor and a displacement sensor. The pressure sensor is configured to detect the thrust output by the jack 11, and the displacement sensor... The displacement sensor is configured to detect the jacking displacement of the piston rod; four sets of fiber mesh strain measurement components 2 are respectively installed at the bottom of the two main beams 100 of the rigid frame bridge and on the two piers 200 of the rigid frame bridge. Each set of fiber mesh strain measurement components 2 includes a strain fiber mesh 21 and a fiber matrix 22. The strain fiber mesh 21 is attached to the surface of the main beam 100 of the rigid frame bridge or the surface of the pier 200 of the rigid frame bridge through the fiber matrix 22. It is configured to measure the distributed strain on the surface of the main beam 100 of the rigid frame bridge and the pier 200 of the rigid frame bridge; the integrated control component 3 is communicatively connected to the pressure sensor, displacement sensor and strain fiber mesh 21. It is configured to receive jacking force data, displacement data and distributed strain data, and control the start and stop of the jack 11.

[0037] This invention utilizes two sets of jacking force execution components 1 symmetrically arranged along the centerline of the bridge's extension direction, ensuring force balance in its structural layout. Secondly, the pressure sensor equipped with the jack 11 can detect the output jacking force in real time, and the displacement sensor can simultaneously capture the jacking displacement of the piston rod, feeding back the jacking force data and piston rod displacement data to the integrated control component 3 in real time. This not only eliminates subjective errors from manual observation but also obtains continuous and accurate jacking force and displacement data, avoiding thrust deviations caused by adjusting pump station pressure based on experience. Furthermore, it eliminates the need for manual data recording, reducing errors and delays in data recording. Furthermore, by installing fiber mesh strain measurement components 2 at the bottom of the main beam 100 and on the surface of the pier 200 of the rigid frame bridge, the distributed strain on the structural surface can be measured through the strain fiber mesh 21. These data can reflect the stress state of the main beam 100 and the pier 200 of the rigid frame bridge in real time during the jacking process. When the jacking force is too large, the strain of the main beam 100 or the pier 200 will exceed the normal range; when the jacking force is insufficient, the strain will not reach the expected standard. This allows construction personnel to clearly understand the stress situation of the structure and effectively avoid problems such as local concrete pressure loss and substandard prestress caused by abnormal strain. In addition, the integrated control component 3 can centrally receive jacking force, displacement, and distributed strain data. When the data is abnormal, such as the jacking force exceeding the preset threshold or the strain data showing that the structure is under excessive stress, the integrated control component 3 can promptly issue a command to control the jack 11 to stop jacking, thereby quickly responding to abnormal situations during construction.

[0038] In this embodiment, as Figure 1 As shown, the main beam 100 of the rigid frame bridge is constructed using the cantilever segmental construction method and is in the maximum cantilever state. The bottom plate width of the main beam 100 is 7.5m and the length of the main beam 100 is 4.0m. The pier 200 of the rigid frame bridge adopts a rectangular section concrete structure with a pier height of 20m and a cross-sectional dimension of 2m×7.5m.

[0039] Specifically, such as Figure 3 As shown, the strain fiber mesh 21 includes multiple parallel transverse strain fibers 211 and multiple parallel longitudinal strain fibers 212, with the transverse strain fibers 211 and longitudinal strain fibers 212 arranged orthogonally. They are bonded and fixed to the surface of the main beam 100 or the pier column 200 of the rigid frame bridge via a fiber matrix 22. The separate fiber bundles are easier to transport and store, and can adapt to monitoring tasks of rigid frame bridges of different sizes and types. This eliminates the need to customize a specific overall mesh for each bridge, reducing repetitive investment costs. Furthermore, construction personnel can flexibly adjust the distribution density and coverage of the transverse strain fibers 211 and longitudinal strain fibers 212 according to actual on-site monitoring needs.

[0040] More specifically, the strain fiber mesh 21 is a long strip structure with a width of 0.45m-0.6m. The mesh units formed by the transverse strain fibers 211 and the longitudinal strain fibers 212 are square, and the side length of the mesh units is 15cm-25cm. This setup can effectively identify local stress concentration phenomena, avoid missing tiny strain anomalies due to excessively large meshes, and prevent data redundancy caused by excessively dense meshes.

[0041] More specifically, the length of the strain fiber mesh 21 set on the bottom plate of the main beam 100 of the rigid frame bridge is equal to the width of the bottom plate of the main beam 100 of the rigid frame bridge, and the length of the strain fiber mesh 21 set on the pier column 200 of the rigid frame bridge is equal to the cross-sectional length of the pier column 200 of the rigid frame bridge.

[0042] In this embodiment, the bottom plate width of the main beam 100 of the rigid frame bridge is 7.5m, the cross-sectional dimensions of the pier column 200 of the rigid frame bridge are 2m×7.5m, the total area of ​​the strain fiber mesh 21 is 0.5m×7.5m, and the mesh size is 20cm×20cm.

[0043] In other embodiments, the total area of ​​the strain fiber mesh 21 can also be 0.6m×6m. The length of the strain fiber mesh 21 is not specifically limited here, but can be flexibly adjusted according to the width of the bottom plate of the main beam 100 of the rigid frame bridge and the cross-sectional length of the pier column 200 of the rigid frame bridge in actual construction.

[0044] Specifically, the fiber matrix 22 is a flexible composite material with a thickness of 1mm-3mm. This 1mm-3mm thickness ensures strong adhesion during construction, preventing detachment. Furthermore, when disassembly is required after the monitoring task is completed, the construction personnel utilize the flexible matrix's inherent flexibility to peel it from the concrete surface, avoiding the brittle fracture that may occur with rigid or excessively thick matrices during disassembly.

[0045] Specifically, such as Figure 1 As shown, the fiber mesh strain measurement component 2, installed on the surface of the rigid frame bridge pier 200, is 0.4m-0.6m away from the bottom surface of the main beam 100 of the rigid frame bridge. The connection area between the main beam 100 and the rigid frame bridge pier 200 is subjected to huge bending moments and shear forces. Moving the measuring point downward can effectively avoid the direct node area where the shear force is most significant. Furthermore, moving it downward by 0.4m-0.6m makes the strain signal measured by the strain fiber mesh 21 closer to the pure bending strain caused by the jacking force.

[0046] Specifically, the fiber mesh strain measurement component 2, installed at the bottom of the main girder 100 of the rigid frame bridge, is located 0.1m-0.12m away from the end of the main girder 100 near the closure section. During the jacking process, the cantilever end of the main girder 100 is the direct area of ​​action of the axial jacking force, where the axial stress is the greatest. Setting the measuring point only 0.1m-0.12m away from the end allows for maximum proximity to this force inlet, thus enabling sensitive and accurate measurement of the axial strain of the main girder 100 generated by the jacking force.

[0047] Specifically, such as Figure 2 As shown, the support frame 12 includes a support rod 121 and two support plates 122. The two support plates 122 are fixedly connected to both ends of the support rod 121. One end of the support plate 122 abuts against the main beam 100 of the rigid frame bridge, and the other end of the support plate 122 is connected to the jack 11. The two support plates 122 can effectively diffuse the concentrated force. The support plate 122 abutting against the main beam 100 of the rigid frame bridge distributes the jacking force transmitted from the jack 11 from a smaller contact surface to a larger contact surface, reducing the local compressive stress at the contact point of the main beam and preventing pressure damage to the concrete surface. Similarly, the support plate 122 connecting the jack allows the reaction force of the jack 11 to be evenly transmitted through the support rod 121.

[0048] More specifically, the surface of the support plate 122 that contacts the main beam 100 of the rigid frame bridge is provided with anti-slip texture or is equipped with anti-slip mats. During the jacking process, the thrust applied by the jack 11 will act on the contact surface between the support plate 122 and the concrete of the main beam 100 of the rigid frame bridge through the support frame 12. The anti-slip texture or anti-slip mat can increase the roughness and interlocking ability of the contact surface, ensuring the positional stability and reliability of the entire jacking force execution component 1 during the force application process.

[0049] Specifically, such as Figure 4 and Figure 5 As shown, the integrated control component 3 includes a signal transmitter 31 and a controller 32. The signal transmitter 31 is used to receive data from the pressure sensor, displacement sensor and strain fiber mesh. The controller 32 is communicatively connected to the signal transmitter 31 to receive the above data, and can calculate based on the received data and compare it with the preset jacking control parameters, and then output control commands to the signal transmitter 31. The signal transmitter 31 can send the control commands to the jack 11 to control its start and stop.

[0050] In this embodiment, the controller 32 integrates a human-machine interface for displaying jacking force, displacement, distributed strain data, and the analysis results of the controller 32, and can also be used to input jacking control parameters.

[0051] It should be noted that, in this embodiment, the integrated control component 3 is a combination application of industrial control equipment commonly used in the field. Furthermore, the functional modules and program algorithms used to implement data reception, display, storage, transmission, and control command generation are all control methods that can be implemented using existing software programming techniques.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A device for measuring and controlling the thrust at the top of a rigid frame bridge, characterized in that, include: Two sets of jacking force execution components (1) are set at the closure section of two adjacent rigid frame bridge main beams (100) and are symmetrically arranged along the center line of the bridge extension direction. Each set of jacking force execution components (1) includes a jack (11) and a support frame (12). One end of the support frame (12) abuts against one of the rigid frame bridge main beams (100) and the other end is connected to the jack (11). The piston rod of the jack (11) can push the other rigid frame bridge main beam (100). The jack (11) is equipped with a pressure sensor and a displacement sensor. The pressure sensor is configured to detect the jacking force output by the jack (11), and the displacement sensor is configured to detect the jacking displacement of the piston rod. Four sets of fiber mesh strain measurement components (2) are respectively set at the bottom of the two main beams (100) of the rigid frame bridge and on the two piers (200) of the rigid frame bridge. Each set of fiber mesh strain measurement components (2) includes a strain fiber mesh (21) and a fiber matrix (22). The strain fiber mesh (21) is attached to the surface of the main beam (100) of the rigid frame bridge or the surface of the pier (200) of the rigid frame bridge through the fiber matrix (22) and is configured to measure the distributed strain on the surface of the main beam (100) of the rigid frame bridge and the pier (200). The integrated control component (3) is communicatively connected to the pressure sensor, the displacement sensor and the strain fiber mesh (21), and is configured to receive top thrust data, displacement data and distributed strain data, and control the start and stop of the jack (11).

2. The rigid frame bridge thrust measurement and control device according to claim 1, characterized in that, The strain fiber mesh (21) includes multiple parallel transverse strain fibers (211) and multiple parallel longitudinal strain fibers (212), and the transverse strain fibers (211) and the longitudinal strain fibers (212) are arranged orthogonally, and are bonded and fixed to the surface of the main beam (100) of the rigid frame bridge or the pier column (200) through the fiber matrix (22).

3. The rigid frame bridge thrust measurement and control device according to claim 2, characterized in that, The strain fiber mesh (21) is a long strip structure with a width of 0.45m-0.6m. The grid unit formed by the transverse strain fiber (211) and the longitudinal strain fiber (212) is square, and the side length of the grid unit is 15cm-25cm.

4. The rigid frame bridge thrust measurement and control device according to claim 1, characterized in that, The fiber mesh strain measurement component (2) installed on the surface of the rigid frame bridge pier (200) is 0.4m-0.6m away from the bottom surface of the main beam (100) of the rigid frame bridge.

5. The rigid frame bridge thrust measurement and control device according to claim 1, characterized in that, The fiber mesh strain measurement component (2) is located at the bottom of the main beam (100) of the rigid frame bridge at a distance of 0.1m-0.12m from one end of the main beam (100) of the rigid frame bridge near the closure section.

6. The rigid frame bridge thrust measurement and control device according to claim 1, characterized in that, The support frame (12) includes a support rod (121) and two support plates (122). The two support plates (122) are fixedly connected to both ends of the support rod (121). One end of the support plate (122) abuts against the main beam (100) of the rigid frame bridge, and the other end of the support plate (122) is connected to the jack (11).

7. The rigid frame bridge thrust measurement and control device according to claim 6, characterized in that, The surface of the support plate (122) that contacts the main beam (100) of the rigid frame bridge is provided with anti-slip texture or is equipped with anti-slip mat.

8. The rigid frame bridge thrust measurement and control device according to any one of claims 1-7, characterized in that, The fiber matrix (22) is a flexible composite material with a thickness of 1mm-3mm.

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