Floating tunnel wave flow response experiment device considering influence of axial force of pipe body

Abstract

The utility model relates to the technical field of ocean engineering physical model experiments, in particular to a floating tunnel wave flow response experiment device considering the influence of pipe body axial force, which comprises an integral frame, a height adjusting device and a pipe body axial force adjusting device. According to the utility model, the tension and pressure of the floating tunnel pipe body can be flexibly adjusted so as to research the dynamic response of the structure under different tension or pressure conditions; according to the utility model, axial excitation can be applied to the end part of the pipe body of the floating tunnel, so as to research the dynamic response of the floating tunnel under the influence of time-varying axial force. According to the utility model, the height of the experiment system and the span length of the suspension tunnel pipe body can be flexibly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering physical model experiments, in particular to a suspended tunnel wave and flow response experimental device taking into account the influence of the axial force of a pipe body. Background Art

[0002] With the increasing demand for transportation across deep and large straits, floating tunnels have attracted more and more attention from scholars due to their significant advantages such as being less affected by weather, not affecting navigation, and being less affected by terrain, water depth and other conditions. Anchored cable floating tunnels are a typical representative of floating tunnels, which are fixed in the water by the balance of their own underwater buoyancy and anchor tension. Since the floating tunnel is below the water surface, it is directly affected by waves and water flow, and the dynamic response of the floating tunnel system under the action of wave and current loads is very complex. In the water flow environment, the corresponding axial force will be generated inside the floating tunnel pipe body, and assembly stress may also be generated during the installation of the pipe body. For a flexible and slender structure such as a floating tunnel, the axial force is different, the natural frequency and vibration mode of the structure will also be different, and its dynamic response under the action of wave and current loads will also be different. Therefore, in order to accurately obtain the dynamic response of the floating tunnel in the wave and current environment, it is necessary to accurately simulate the axial force of the pipe body.

[0003] Nowadays, many scholars have done a lot of research on the dynamic response of suspended tunnels under the action of waves and currents. However, the wave-flow response mechanism of suspended tunnels under the influence of the axial force of the tube body is still unclear, and there is no relevant experimental equipment and methods. Therefore, there is an urgent need for a set of suspended tunnel wave-flow response experimental equipment that can consider the influence of the axial force of the tube body to carry out relevant experiments. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a physical model test device for studying the dynamic response characteristics of a suspended tunnel under wave and current loads and capable of adjusting the axial force of the tube body.

[0005] The technical solution of this utility model:

[0006] A suspended tunnel wave-flow response experimental device taking into account the influence of the tube axial force comprises an overall frame, a height adjustment device and a tube axial force adjustment device.

[0007] The overall frame includes a crossbeam 201, a left guide rail 202, a right guide rail 203 and a bottom mounting platform 204; the bottom mounting platform 204 is provided with two parallel sliding grooves 207 that penetrate left and right, providing installation tracks for the left guide rail 202 and the right guide rail 203, and providing anchor points for the anchor cable 102 of the suspended tunnel to be tested; the left guide rail 202 and the right guide rail 203 are both composed of two profiles, and each guide rail has a groove that penetrates up and down on the front and rear surfaces; the left guide rail 202 and the right guide rail 203 are both composed of two profiles, and each guide rail has a groove that penetrates up and down on the front and rear surfaces; The guide rail 202 and the right guide rail 203 are arranged vertically, and the bottoms of the two are fixed in the slide groove 207 of the bottom mounting platform 204 through an L-shaped connector 206. The upper parts of the two are connected left and right through a crossbeam 201, and the connection is reinforced by a profile connector 205. When adjusting the spacing, according to the span length of the suspended tunnel body 101 to be tested, the spacing between the left guide rail 202 and the right guide rail 203 is adjusted to a suitable distance, and then the connector screw 208 on the L-shaped connector 206 is tightened to complete the spacing adjustment.

[0008] The height adjustment device is installed on the left guide rail 202 and the right guide rail 203, and includes a left slider 301 installed on the left guide rail 202, a right slider 302 installed on the right guide rail 203, and a slider fixing bolt 303, which is used to adjust the height of the suspended tunnel body 101 to be tested; the left slider 301 and the right slider 302 are both composed of two steel plates with corresponding holes at four corners, and the two steel plates are respectively located on the front and rear sides of the guide rails, and are fastened together by the slider fixing bolt 303. After the slider fixing bolt 303 is loosened, the positions of the left slider 301 and the right slider 302 on the left guide rail 202 and the right guide rail 203 are adjusted. When adjusting the height of the suspended tunnel body 101 and the anchor cable 102 in the suspended tunnel body system to be tested, the slider fixing bolt 303 needs to be loosened, and the slider fixing bolt 303 on the left slider 301 and the right slider 302 can be tightened after the system is adjusted to a predetermined height. The left slider 301 and the right slider 302 are arranged opposite to each other, and slideways are provided on the surfaces of the steel plates of the two that contact the left guide rail 202 and the right guide rail 203, which cooperate with the grooves on the left guide rail 202 and the right guide rail 203, so that the left slider 301 and the right slider 302 can slide along the left guide rail 202 and the right guide rail 203 respectively.

[0009] The pipe body axial force adjustment device is installed between the left guide rail 202 and the right guide rail 203, and is used to adjust the axial force of the suspended tunnel pipe body 101 to be tested; the pipe body axial force adjustment device includes a servo hydraulic cylinder 401, a tension and compression sensor 402, a left flange 403, a right flange 404, a connecting rod 409 and accessories; the accessories include a hydraulic cylinder assembly plate 410, a tension and compression sensor assembly plate 411, a flange assembly plate 412, a hydraulic cylinder mounting screw 413, an assembly plate fastening bolt 414, a flange screw 415 and a flange top screw 416; the hydraulic cylinder assembly plate 410 and the hydraulic cylinder mounting screw 413 with four corner openings at the left end of the servo hydraulic cylinder 401 are installed on the inner side of the left slider 301, and the right end is fixedly connected to one end of the tension and compression sensor 402 through another hydraulic cylinder assembly plate 410 and the tension and compression sensor assembly plate 411, and the hydraulic cylinder assembly plate 410 and the tension and compression sensor assembly plate 411 are respectively at Holes are opened at corresponding positions of the four corners, and the fastening bolts 414 of the fastening assembly plate are passed through the holes and tightened to complete the connection between the two; the other end of the tension and compression sensor 402 is also provided with a tension and compression sensor assembly plate 411, which is fixedly connected to one end of the flange assembly plate 412 through the assembly plate fastening bolts 414; the left flange 403 and the right flange 404 are respectively installed on the two ends of the suspension tunnel pipe body 101 through flange screws 415, and a connecting rod 409 is respectively provided on the outer side of the left flange 403 and the right flange 404, and the two ends of the connecting rod 409 are respectively connected to the left flange 403 and the right flange 404 through flange top screws 416; the other end of the right connecting rod 409 is fixedly connected to the inner side of the right slider 302, and the other end of the left connecting rod 409 is fixedly connected to the other end of the flange assembly plate 412; the suspension tunnel pipe body 101 is connected to the pipe body axial force adjustment device through the left flange 403 and the right flange 404. When adjusting the axial force of the floating tunnel body 101 , the top rod of the servo hydraulic cylinder 401 needs to be extended or retracted through the control system according to the reading of the tension and compression sensor 402 .

[0010] The utility model overcomes the shortcomings of the existing physical model experiment technology of dynamic response of suspended tunnels under wave and flow loads, and its main advantages are:

[0011] (1) The utility model can flexibly adjust the tension and pressure of the suspended tunnel tube to study the dynamic response of the structure under different tension or pressure conditions;

[0012] (2) The utility model can realize the application of axial excitation at the end of the suspended tunnel body to study the dynamic response of the suspended tunnel under the influence of time-varying axial force.

[0013] (3) The utility model can flexibly adjust the height of the experimental system and the span length of the suspended tunnel tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a suspended tunnel wave-flow response experimental device that takes into account the influence of the tube axial force;

[0015] Figure 2 It is a schematic diagram of the left slider and the height and tube body axial force adjustment device;

[0016] Figure 3 It is a schematic diagram of the connection between the right slider and the tube body;

[0017] Figure 4 It is a schematic diagram of the connection method between the guide rail and the bottom mounting platform.

[0018] In the figure: 101 suspended tunnel body; 102 anchor cable; 201 crossbeam; 202 left guide rail; 203 right guide rail; 204 bottom mounting platform; 205 profile connector; 206 L-shaped connector; 207 slideway; 208 connector screw; 209 connector gasket; 301 left slider; 302 right slider; 303 slider fixing bolt; 401 servo hydraulic cylinder; 402 tension and compression sensor; 403 left flange; 404 right flange; 405 hydraulic oil inlet pipe; 406 hydraulic oil outlet pipe; 407 hydraulic cylinder data transmission line; 408 tension and compression sensor data line; 409 connecting rod; 410 hydraulic cylinder assembly plate; 411 tension and compression sensor assembly plate; 412 flange assembly plate; 413 hydraulic cylinder mounting screw; 414 assembly plate fastening bolt; 415 flange screw; 416 flange top screw. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings and technical solutions.

[0020] like Figure 1 As shown, a floating tunnel wave-flow response experimental device considering the influence of the tube axial force of the utility model comprises an overall frame, a height adjustment device and a tube axial force adjustment device.

[0021] The overall framework of the device is as follows Figure 1 As shown, it is mainly used to install the anchor cable 102 of the suspended tunnel to be tested, and to provide a fixed position and guide rails for the left and right sliders (left slider 301, right slider 302). At the same time, the slide groove 207 opened on the bottom mounting platform provides a slide groove for the left and right guide rails to move left and right (such as Figure 4 As shown in the figure, the upper parts of the left guide rail 202 and the right guide rail 203 are fixedly connected by a crossbeam 201, and the lower parts are fixedly mounted on the bottom mounting platform 204 through an L-shaped connector; when adjusting the span length, it is only necessary to loosen the connector screws 208 and tighten them after the guide rail spacing is adjusted to a suitable position.

[0022] The height adjustment device is mainly used to adjust the submerged depth of the suspended tunnel body 101 to be tested. The left and right sliders (left slider 301 and right slider 302) are respectively installed in the middle of the two grooves of the left guide rail 202 and the right guide rail 203, and are fixed by the slider fixing bolts 303 on the sliders. When adjusting the height of the system, it is only necessary to loosen the screws of the slider fixing bolts, manually lift the experimental system to the target height, and then tighten the screws to fix it.

[0023] The pipe body axial force adjustment device is based on the system height adjustment device, and adds a servo hydraulic cylinder 401, a tension and compression sensor 402, a left flange 403, a right flange 404, a connecting rod 409 and other accessories. The pipe body axial force adjustment device can further adjust the axial force of the suspended tunnel pipe body 101 to be tested on the basis of the fixed experimental system. The structure of the pipe body axial force adjustment device is as follows Figure 2 and Figure 3 As shown, the two ends of the suspended tunnel tube body 101 are connected to the axial force adjustment device through the left flange 403 and the left flange 404, and the two ends of the servo hydraulic cylinder 401 are connected to the left slider 301 and the tension and compression sensor 402 through the hydraulic cylinder assembly plate 410; the other end of the tension and compression sensor 402 is fixedly connected to the flange assembly plate 412 through the tension and compression sensor assembly plate 411; and the assembly plates are fixed with fastening bolts. When adjusting the axial force of the tube body, it is only necessary to control the extension and retraction of the hydraulic cylinder top rod. The servo hydraulic cylinder 401 also includes a hydraulic oil inlet pipe 405, a hydraulic oil outlet pipe 406, and a hydraulic cylinder data transmission line 407. The tension and compression sensor 402 also includes a tension and compression sensor data line 408.

[0024] The above-mentioned floating tunnel wave flow response experimental device considering the influence of the tube axial force is used to conduct the experiment. The specific steps are as follows:

[0025] Step 1) Before the experiment, determine the submerged depth of the suspended tunnel experimental system, the span length of the suspended tunnel tube body 101, and the time-varying axial force and fixed axial force of the suspended tunnel tube body 101, and determine the time-varying duration curve of the axial force; calibrate the tension and compression sensor 402 in advance, and extend the top rod of the servo hydraulic cylinder 401 to a suitable position in advance, and record this position as the initial position of the hydraulic cylinder;

[0026] Step 2), the left hydraulic cylinder assembly plate 410 is fixedly connected to the left slider 301 through the hydraulic cylinder mounting screws 413, the right hydraulic cylinder assembly plate 410 is fixedly connected to the left tension and compression sensor assembly plate 411 through the assembly plate fastening bolts 414, the right tension and compression sensor assembly plate 411 is fixedly connected to the flange assembly plate 412 through the assembly plate fastening bolts 414, and at the same time, the flange top screw 416 is tightened to completely connect the left flange 403 and the right flange 404;

[0027] Step 3), on the basis of step 2), assemble the assembled height adjustment device and the pipe body axial force adjustment device to the left guide rail 202 and the right guide rail 203, and temporarily fix them by fastening bolts 303; then connect the suspended tunnel pipe body 101 to the left flange 403 and the right flange 404 by flange screws 415, tighten the connecting screws, and simply support the middle position of the pipe body with supports; and fix the left guide rail 202 and the right guide rail 203 on the bottom mounting platform 204;

[0028] Step 4), at this time, after the floating tunnel body 101 reaches the predetermined submerged depth position by lifting the left slider 301 and the right slider 302, the slider fixing bolts 303 on the left slider 301 and the right slider 302 are tightened to fix them; at the same time, the anchor cable 102 of the floating tunnel is installed;

[0029] Step 5), after the water is discharged to the predetermined position in the water tank, the pipe body support is removed, and the tension and compression sensor 402 is adjusted to zero. At this time, the control program for controlling the extension and retraction of the hydraulic cylinder is prepared in advance in the hydraulic cylinder control system according to the reading of the tension and compression sensor 402, and the reading of the tension and compression sensor is controlled to reach the predetermined value of the time-varying axial force of the pipe body; at the same time, for the fixed axial force, the servo hydraulic cylinder 401 is controlled to extend or contract through the controller to adjust the tension and pressure of the tunnel pipe body, and the tension and compression sensor data is read while the hydraulic cylinder is working, and the hydraulic cylinder is stopped and maintained after the axial force of the pipe body is adjusted to the predetermined data;

[0030] Step 6) After the adjustment is completed, the tension and compression sensor 402 is zeroed again. At this time, the wave maker or flow making system is turned on to wait for the wave field or flow field to stabilize. At the same time, the control system runs a pre-programmed program to control the servo hydraulic cylinder 401 to regularly extend and retract to achieve the application of time-varying excitation at both ends of the pipe body; or after controlling the hydraulic cylinder top rod to extend or retract to a specified position, the wave maker or flow making system can be turned on to carry out the wave and flow response experiment of the suspended tunnel under the fixed axial force of the pipe body.

Claims

1. A floating tunnel wave flow response experimental device considering the influence of the tube axial force, characterized in that: The experimental device comprises an overall frame, a height adjustment device and a tube body axial force adjustment device; The overall frame comprises a crossbeam (201), a left guide rail (202), a right guide rail (203) and a bottom mounting platform (204); the bottom mounting platform (204) is provided with two parallel sliding grooves (207) extending from left to right, which provide mounting tracks for the left guide rail (202) and the right guide rail (203) and can also provide anchor points for the anchor cables (102) of the suspended tunnel to be tested; the left guide rail (202) and the right guide rail (203) are both composed of two profiles, and each guide rail has a groove extending from top to bottom on its front and rear surfaces; the left guide rail (202) and the right guide rail (203) are both provided with ... The guide rail (202) and the right guide rail (203) are arranged vertically, and the bottoms of the two are fixed in the slide groove (207) of the bottom mounting platform (204) through an L-shaped connector (206), and the upper parts of the two are connected left and right through a crossbeam (201), and the connection is reinforced by a profile connector (205); when adjusting the spacing, according to the span length of the suspended tunnel tube body (101) to be tested, the spacing between the left guide rail (202) and the right guide rail (203) is adjusted to a suitable distance, and then the connector screw (208) on the L-shaped connector (206) is tightened to complete the spacing adjustment; The height adjustment device is installed on the left guide rail (202) and the right guide rail (203), and comprises a left slider (301) installed on the left guide rail (202), a right slider (302) installed on the right guide rail (203), and a slider fixing bolt (303), and is used to adjust the height of the suspended tunnel tube body (101) to be tested; the left slider (301) and the right slider (302) are both composed of two steel plates with corresponding openings at four corners, the two steel plates are respectively located on the front and rear sides of the guide rails, and are fastened together by the slider fixing bolt (303). After the slider fixing bolt (303) is loosened, the left slider (301) and the right slider (302) are adjusted to the left guide rail (202) and the right guide rail (203). 3) on the position; when adjusting the height of the suspended tunnel tube body (101) and the anchor cable (102) in the suspended tunnel tube body system to be tested, it is necessary to loosen the slider fixing bolts (303), and after adjusting the system to a predetermined height, tighten the slider fixing bolts (303) on the left slider (301) and the right slider (302); the left slider (301) and the right slider (302) are arranged opposite to each other, and the surfaces of the steel plates of the two that contact the left guide rail (202) and the right guide rail (203) are provided with slideways, which cooperate with the grooves on the left guide rail (202) and the right guide rail (203), so that the left slider (301) and the right slider (302) can slide along the left guide rail (202) and the right guide rail (203) respectively; The pipe body axial force adjustment device is installed between the left guide rail (202) and the right guide rail (203) and is used to adjust the axial force of the suspended tunnel pipe body (101) to be tested; the pipe body axial force adjustment device comprises a servo hydraulic cylinder (401), a tension and compression sensor (402), a left flange (403), a right flange (404), a connecting rod (409) and accessories; the accessories comprise a hydraulic cylinder assembly plate (410), a tension and compression sensor assembly plate (411), a flange assembly plate (412), a hydraulic cylinder mounting screw (413), and an assembly plate fastening bolt (41 4), flange screws (415) and flange top screws (416); the left end of the servo hydraulic cylinder (401) is installed on the inner side of the left slider (301) through the hydraulic cylinder assembly plate (410) with four corner openings and the hydraulic cylinder mounting screws (413), and the right end is fixedly connected to one end of the tension and compression sensor (402) through another hydraulic cylinder assembly plate (410) and a tension and compression sensor assembly plate (411). The hydraulic cylinder assembly plate (410) and the tension and compression sensor assembly plate (411) are respectively opened at the corresponding positions of the four corners, and the fastening bolts (414) of the fastening assembly plate are screwed through the openings. The connection between the two can be completed by tightening the screws; the other end of the tension and compression sensor (402) is also provided with a tension and compression sensor assembly plate (411), which is fixedly connected to one end of the flange assembly plate (412) through the assembly plate fastening bolts (414); the left flange (403) and the right flange (404) are respectively installed on the two ends of the suspension tunnel pipe body (101) through flange screws (415), and a connecting rod (409) is respectively provided on the outer side of the left flange (403) and the right flange (404), and the two ends of the connecting rod (409) are respectively connected to the left flange (403) and the right flange (404) through flange top screws (416). The flange (403) is connected to the right flange (404); the other end of the right connecting rod (409) is fixedly connected to the inner side of the right slider (302), and the other end of the left connecting rod (409) is fixedly connected to the other end of the flange assembly plate (412); the suspended tunnel pipe body (101) is connected to the pipe body axial force adjustment device through the left flange (403) and the right flange (404); when adjusting the axial force of the suspended tunnel pipe body (101), the control system of the servo hydraulic cylinder (401) is used to extend or retract the top rod according to the reading of the tension and compression sensor (402).

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