A steel casing stress test device for deep water uneven bare rock area

Abstract

The present invention relates to the technical field of steel casing stress, and specifically discloses a steel casing stress test device in deep-water uneven bare rock area, including a test box, the bottom of the inner side of the test box is rotatably connected to a base plate, an angle adjustment device is installed in the test box, the angle adjustment device can adjust the inclination angle of the base plate, a vertically arranged steel casing is arranged above the base plate, a pad is used to fill the gap between the lower end of the steel casing and the base plate, a strain type pressure sensor is installed on one side of the pad, and a pressure device is arranged in the test box, the pressure device is used to generate lateral thrust to the steel casing, so as to test the stress of the pad under different thrusts on the steel casing and the stability of the steel casing itself. The present invention sprays high-pressure water toward the steel casing through a high-pressure nozzle, thereby generating thrust on the steel casing, and at the same time sprays high-pressure water to the steel casing from multiple directions, so that more groups of data can be collected to obtain the stress of the steel casing under different working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of steel casing stress, and in particular relates to a steel casing stress test device in a deep-water uneven bare rock area. Background Art

[0002] The traditional underwater pile foundation construction process mainly includes the steps of setting up steel casing, drilling, hole cleaning, steel cage installation, secondary hole cleaning and pile foundation concrete pouring. When setting up the steel casing, the steel casing is first sunk to the bottom of the water, and then the water in the steel casing is drained, so as to form an independent space in the steel casing, so that drilling, hole cleaning, steel cage installation and other construction can be carried out in the steel casing with confidence. It can be seen that the role of the steel casing is very important. Therefore, before construction, it is necessary to select a steel casing with suitable materials or suitable wall thickness or suitable pipe diameter according to the construction site environment. There is a theoretical calculation method in the prior art, which calculates and selects the steel casing according to the water flow velocity, the depth of the steel casing into the water and the geological conditions of the bottom of the water. When encountering deep water and uneven underwater areas, it is easy to produce deviations when calculating and selecting the steel casing by the calculation method in the prior art. At this time, it is necessary to conduct a simulation experiment on the steel casing, so as to cooperate with the calculation to obtain various parameters of the steel casing. After searching, there is no similar simulation test equipment in the prior art. Summary of the invention

[0003] The purpose of the present invention is to provide a steel casing stress test device for deep-water uneven bare rock areas to solve the problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A stress testing device for steel casing in deep-water uneven bare rock areas comprises a test box, the inner bottom of the test box is rotatably connected to a base plate, an angle adjustment device is installed in the test box, the angle adjustment device can adjust the inclination angle of the base plate, a vertically arranged steel casing is arranged above the base plate, a pad is used to fill the gap between the lower end of the steel casing and the base plate, a strain type pressure sensor is installed on one side of the pad, a pressure device is arranged in the test box, the pressure device is used to generate lateral thrust on the steel casing, so as to test the stress condition of the pad under different thrusts on the steel casing and the stability of the steel casing itself.

[0006] Preferably, a sleeve ring is rotatably connected to the outer side of the steel casing, a locking screw is mounted on the sleeve ring, a support rod is hinged to the outer side of the sleeve ring, and one end of the support rod is ball-hinged to the electromagnetic suction cup.

[0007] Preferably, the support rod includes a fixed rod, one end of which is provided with a sliding hole, in which the sliding rod is slidably connected, and the sliding rod is hinged to the ring through a hinge, and the other end of the fixed rod is provided with a threaded hole, in which the adjusting screw is threadedly connected, and the other end of the adjusting screw is fixedly connected to a transition plate, and the transition plate is connected to the electromagnetic suction cup through a ball hinge seat, and a pressure sensor is installed between the sliding rod and the bottom of the sliding hole.

[0008] Preferably, it also includes a bracket, which is fixedly connected to a suspension rod, and a pressure-applying device can slide back and forth up and down along the suspension rod. The pressure-applying device includes a circular ring, and a circular track is coaxially fixed on the upper side of the circular ring. A plurality of sliders are slidably connected to the circular track, and each slider is equipped with a traveling device, which can drive the slider to reciprocate along the circular track. Each slider is equipped with a high-pressure water spraying device, and the high-pressure water spraying device is used to spray high-pressure water toward the steel casing, thereby generating thrust on the steel casing.

[0009] Preferably, the high-pressure water spraying device includes a vertical plate, one side of the vertical plate is rotatably connected to a rotating shaft, one end of the rotating shaft is equipped with a high-pressure nozzle, the high-pressure nozzle is arranged toward the steel casing, and one side of the vertical plate is equipped with a driving device, which is used to drive the rotating shaft to rotate clockwise or counterclockwise.

[0010] Preferably, the bracket includes a base plate, the upper side of the base plate is fixedly connected to the column, the upper end of the column is fixedly connected to the top plate, the suspension rod is fixedly connected to the lower side of the top plate, the top plate is equipped with a motor, a screw rod is coaxially fixed on the main shaft of the motor, a screw nut is installed on the ring, and the screw rod is threadedly connected to the screw nut.

[0011] Preferably, a support plate is provided at the lower end of the suspension rod and the screw rod, and both support plates are fixed on the inner wall of the test box. The suspension rod is fixed to the support plate, and the lower end of the screw rod is rotatably connected to the support plate.

[0012] The technical effects and advantages of the present invention are as follows: a steel casing stress test device for deep-water uneven bare rock areas provided by the present invention sprays high-pressure water toward the steel casing through a high-pressure nozzle, thereby generating thrust on the steel casing. At the same time, high-pressure water is sprayed on the steel casing from multiple directions, so that more groups of data can be collected to obtain the stress conditions of the steel casing under different working conditions.

[0013] When spraying high-pressure water, the angle of the high-pressure nozzle can be adjusted, so that the direction of the water spray is constantly changing, thus simulating the force of the wave-shaped water flow on the steel casing. This can be repeated for many times to simulate the uneven state of the deep water bottom according to the different inclination angles of the substrate. The calculation method in the existing technology is used for double verification, and the parameters of the steel casing are selected more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a basic structural schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 A magnified image of point A;

[0016] Figure 3 It is a basic structural schematic diagram of the pressure-applying device;

[0017] Figure 4 It is a schematic diagram of the basic structure of the support rod. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides Figure 1-4 The device shown is a stress test device for steel casing in deep-water uneven bare rock areas, comprising a test box 2, the inner bottom of the test box 2 being rotatably connected to a base plate 21, the base plate 21 being made of carbon steel, and an angle adjustment device being installed in the test box 2, the angle adjustment device being capable of adjusting the inclination angle of the base plate 21, the angle adjustment device adopts existing technology, and how to install it is also existing technology, which will not be elaborated here.

[0020] A vertically arranged steel casing 9 is provided above the base plate 21, and the gap between the lower end of the steel casing 9 and the base plate 21 is filled with a cushion block 8, and a strain type pressure sensor 81 is installed on one side of the cushion block 8. A pressure device 4 is provided in the test box 2, and the pressure device 4 is used to generate a lateral thrust on the steel casing 9, so as to test the stress condition of the cushion block 8 under different thrusts on the steel casing 9 and the stability of the steel casing 9 itself. A steel casing stress test device for deep-water uneven bare rock areas of this embodiment also includes a bracket, and a suspension rod 3 is fixedly connected to the bracket. The bracket includes a bottom plate 1, and the upper side of the bottom plate 1 is fixedly connected to a column 11, and the upper end of the column 11 is fixedly connected to a top plate 12, and the suspension rod 3 is fixedly connected to the lower side of the top plate 12. A motor 32 is installed on the top plate 12, and a screw 31 is coaxially fixed on the main shaft of the motor 32. A screw nut is installed on the ring 41, and the screw 31 is threadedly connected inside the screw nut. A support plate 33 is provided at the lower end of the suspension rod 3 and the screw rod 31. Both support plates 33 are fixed on the inner wall of the test box 2. The suspension rod 3 is fixed to the support plate 33. The lower end of the screw rod 31 is rotatably connected to the support plate 33. The support plate 33 can stably support the screw rod 31 and the suspension rod 3. The pressure device 4 includes a ring 41. The ring 41 can slide back and forth along the suspension rod 3. A circular track 42 is coaxially fixed on the upper side of the ring 41. A plurality of sliders 43 are slidably connected to the circular track 42. Each slider 43 is equipped with a walking device. The walking device can drive the slider 43 to move back and forth along the circular track 42. The walking device is a prior art and will not be described in detail here. Each slider 43 is equipped with a high-pressure water spraying device. The high-pressure water spraying device is used to spray high-pressure water toward the steel casing 9, thereby generating thrust on the steel casing 9. The high-pressure water spraying device includes a vertical plate 44, one side of the vertical plate 44 is rotatably connected to a rotating shaft 45, one end of the rotating shaft 45 is equipped with a high-pressure nozzle 46, and the high-pressure nozzle 46 is set toward the steel casing 9. A driving device is installed on one side of the vertical plate 44, and the driving device is used to drive the rotating shaft 45 to rotate clockwise or counterclockwise, thereby changing the angle between the high-pressure nozzle 46 and the steel casing 9.

[0021] During use, first adjust the inclination angle of the substrate 21, then hoist the steel casing 9 above the substrate 21, and make the steel casing 9 in a vertical state, that is, perpendicular to the horizontal plane, and fill the gap between the lower end of the steel casing 9 and the substrate 21 with a pad 8, which is made according to the inclination angle of the substrate 21, and then drive the lead screw to rotate through the motor, so that the ring 41 moves downward and enters the test box 2, so that the high-pressure water flow can be sprayed toward the steel casing 9 through the high-pressure nozzle 46, thereby generating a thrust on the steel casing 9, and the ring 4 1 is set to be liftable in order to spray high-pressure water flow to the steel casing 9 from different positions, so as to facilitate the collection of multiple sets of data. In addition, in this embodiment, four high-pressure water spraying devices are used, and the four high-pressure water spraying devices are movable, so that the steel casing 9 can be tested by spraying high-pressure water flow from multiple directions, and more sets of data can be collected. Of course, the four high-pressure water spraying devices can also spray high-pressure water flow toward the steel casing 9 at the same time to obtain the stress of the steel casing 9 under different working conditions. After the steel casing 9 is subjected to thrust, the stress of the steel casing 9 can be obtained through the strain pressure sensor 81. When spraying high-pressure water flow, the angle of the high-pressure nozzle can be adjusted, so that the direction of the water flow spraying is constantly changing, so as to simulate the force of the wave-shaped water flow on the steel casing 9. In this way, multiple tests can be repeated to simulate the uneven state of the deep water bottom according to the different inclination angles of the substrate 21. Double verification is carried out in conjunction with the calculation method in the prior art, and the parameters of the steel casing 9 are selected more accurately.

[0022] As a preferred embodiment of the present invention, in order to further improve the accuracy of the test, the diagonal support of the steel casing 9 is simulated at the bottom of the steel casing 9. The specific setting is as follows: a connecting ring 91 is rotatably connected to the outside of the steel casing 9, and a locking screw is installed on the ring 91. The ring 91 is locked and fixed on the steel casing 9 by the locking screw. During the test, a suitable ring 91 is selected according to the diameter of the steel casing 9. The outer side of the ring 91 is hinged to the support rod 7, and one end of the support rod 7 is ball-hinged to the electromagnetic suction cup 92. After the electromagnetic suction cup 92 is adsorbed on the substrate 21, the support rod 7 is equivalent to the diagonal brace. The support rod 7 includes a fixed rod 71. One end of the fixed rod 71 is provided with a sliding hole. The sliding hole is slidably connected to the sliding rod 72. The sliding rod 72 is hinged to the ring 91 through a hinge. The other end of the fixed rod 71 is provided with a threaded hole 74. The threaded hole 74 is threadedly connected to the adjusting screw 73. The other end of the adjusting screw 73 is fixedly connected to the transition plate 75. The transition plate 75 is connected to the electromagnetic suction cup 92 through a ball hinge seat. A pressure sensor is installed between the sliding rod 72 and the bottom of the sliding hole. When the steel casing 9 is subjected to thrust, the steel casing 9 will also generate a pulling force or thrust on the support rod 7. In this way, the pressure on the support rod 7 can be measured by the pressure sensor, thereby further calculating the force parameters of the diagonal brace. In addition, the initial length of the support rod 7 can be adjusted by adjusting the screw 73, which is suitable for use with different inclination angles of the substrate.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel casing stress test device for deep water uneven bare rock area, characterized by: The test box (2) comprises a test box (2), wherein the bottom of the inner side of the test box (2) is rotatably connected to a base plate (21), an angle adjustment device is installed in the test box (2), and the angle adjustment device can adjust the inclination angle of the base plate (21), a vertically arranged steel casing (9) is arranged above the base plate (21), a spacer block (8) is used to fill the gap between the lower end of the steel casing (9) and the base plate (21), and a strain gauge pressure sensor (81) is installed on one side of the spacer block (8), and a pressure device (4) is arranged in the test box (2), and the pressure device (4) is used to generate a lateral thrust on the steel casing (9), so as to test the stress condition of the spacer block (8) under different thrusts on the steel casing (9) and the stability of the steel casing (9) itself; The outer side of the steel casing (9) is rotatably connected to a sleeve ring (91), a locking screw is mounted on the sleeve ring (91), the outer side of the sleeve ring (91) is hinged to a support rod (7), and one end of the support rod (7) is ball-hinged to an electromagnetic suction cup (92); The support rod (7) comprises a fixed rod (71), one end of the fixed rod (71) is provided with a sliding hole, the sliding hole is slidably connected to a sliding rod (72), the sliding rod (72) is hinged to the sleeve ring (91) through a hinge, the other end of the fixed rod (71) is provided with a threaded hole (74), the threaded hole (74) is internally threaded to connect an adjusting screw (73), the other end of the adjusting screw (73) is fixedly connected to a transition plate (75), the transition plate (75) is connected to an electromagnetic suction cup (92) through a ball hinge seat, and a pressure sensor is installed between the sliding rod (72) and the bottom of the sliding hole; It also includes a bracket, the bracket is fixedly connected to the suspension rod (3), the pressure device (4) can slide back and forth up and down along the suspension rod (3), the pressure device (4) includes a ring (41), a circular track (42) is coaxially fixed on the upper side of the ring (41), a plurality of sliders (43) are slidably connected to the circular track (42), each slider (43) is equipped with a walking device, the walking device can drive the slider (43) to move back and forth along the circular track (42), each slider (43) is equipped with a high-pressure water spraying device, the high-pressure water spraying device is used to spray high-pressure water flow toward the steel casing (9), thereby generating thrust on the steel casing (9); The high-pressure water spraying device comprises a vertical plate (44), one side of the vertical plate (44) is rotatably connected to a rotating shaft (45), one end of the rotating shaft (45) is provided with a high-pressure spray head (46), the high-pressure spray head (46) is arranged toward the steel casing (9), and one side of the vertical plate (44) is provided with a driving device, the driving device is used to drive the rotating shaft (45) to rotate clockwise or counterclockwise.

2. A steel casing stress test device for deepwater uneven bare rock areas according to claim 1, characterized in that: The bracket comprises a bottom plate (1), the upper side of the bottom plate (1) is fixedly connected to a column (11), the upper end of the column (11) is fixedly connected to a top plate (12), the suspension rod (3) is fixedly connected to the lower side of the top plate (12), a motor (32) is mounted on the top plate (12), a screw rod (31) is coaxially fixed on the main shaft of the motor (32), a screw rod nut is mounted on the circular ring (41), and the screw rod (31) is threadedly connected inside the screw rod nut.

3. A deepwater uneven bare rock area steel casing stress test device according to claim 2, characterized in that: A support plate (33) is provided at the lower end of each of the suspension rod (3) and the screw rod (31); both support plates (33) are fixed to the inner wall of the test box (2); the suspension rod (3) is fixed to the support plate (33); and the lower end of the screw rod (31) is rotatably connected to the support plate (33).

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