CN102680165B - Acting force measuring device for pile streaming test - Google Patents

Abstract

The invention discloses an action force measuring device used for a pile circumvention test, which mainly includes a bracket, a pile, a rotating mechanism, three limit mechanisms, and three tension and pressure sensors. Wherein, the first limit mechanism is used to make the upper connection and the lower connection of the first tension-compression sensor be located in the same liquid flow plane, and the connection line between the upper connection and the lower connection of the first tension-compression sensor is vertical Wire. The second limit mechanism is used to make the first connection point and the second connection point of the second tension-pressure sensor be located in the liquid flow direction plane, and the connection between the first connection point and the second connection point of the second tension-pressure sensor The line is horizontal. The third limit mechanism is used to make the third tension-compression sensor only receive force in the direction of the line connecting the first connection point and the second connection point of the third tension-compression sensor during the working process. The invention can be used to measure the flow resistance around the pile and the force along the axial direction of the pile that is vertical or oblique and protruding from the liquid surface under horizontal or oblique flow.

Description

Force Measuring Device for Pile Flow Test

technical field

The invention relates to an active force measuring device used for the flow test of piles protruding from the liquid surface.

Background technique

When liquid flow, such as water flow, bypasses objects such as various piers and piles protruding from the liquid surface orthogonally, the object will be subjected to flow resistance along the flow direction and lateral lift perpendicular to the flow direction. When the pile is inclined or when the liquid flow is oblique to the pile, the force acting on the pile is as follows: the force along the flow direction, the transverse force perpendicular to the axial direction of the pile and the flow direction, and the force along the direction of the pile axial force. According to this, it can be decomposed into the flow force around the pile: the flow resistance along the flow direction and perpendicular to the pile, the lateral lift perpendicular to the flow direction and the axial direction of the pile, and the force along the axial direction of the pile. Due to the complex characteristics of the flow around the pile, it is difficult to directly calculate and solve it theoretically. Most of the research on the flow around piles still relies on numerical simulation and physical model tests. Among them, the accurate measurement of the flow resistance, lift force and axial force on the piles when the piles are inclined or the liquid flow obliquely intersects the piles is very important for the outstanding The physical model test research on the pile flow around the liquid surface is particularly important.

When measuring the flow force around a pile protruding from the liquid surface, it is necessary to ensure that the measuring device cannot interfere with the fluid flow. At present, there are mainly three kinds of force measuring devices for the flow test of vertical piles protruding from the liquid surface: the first one is to connect the top of the pile with a floating body, and use the buoyancy of the floating body to leave a small gap between the pile and the bottom of the channel , and a force-transmitting rigid frame is installed on the pile to transmit the force of the flow around to the force-measuring equipment, and the force-measuring equipment measures the magnitude of the force. The floating body in this device tends to fluctuate under the condition of non-uniform flow and non-steady flow, and the test conditions are relatively strict, and only the flow resistance in the horizontal direction of the vertical pile can be measured, but the oblique flow resistance cannot be measured. The vertical force acting on the pile and the flow force of the unsteady fluid flow. The second is to leave a section of groove at the bottom of the canal, place the pile installation component in the groove, the pile installation panel is flush with the bottom of the groove, install the pile on the panel, the impact of the liquid flow on the pile The force is transmitted to the force-measuring equipment placed in front or behind the entire frame through the force-transmitting frame members above the liquid level. The device needs to reserve a groove at the bottom of the tank. There is friction resistance at the bottom of the tank when the panel is running, and the magnitude of the friction force changes with different flow rates and water depths. The impact of the friction force is difficult to quantify. The device is also unable to measure the vertical force on the pile and the flow around the unsteady fluid flow. The third is to install a pressure sensor symmetrically on the upstream and downstream sides of the pile to be tested to measure the flow resistance of the vertical pile along the flow direction, and install a tension-compression sensor on the top of the vertical pile. The sensor is used to measure the force in the vertical direction of the inclined fluid acting on the pile in the flow direction of the plane. The force signal measured by the sensor is amplified by the amplifier and then input to the recorder. Through the recorder, the dynamic change process of the force of the pile in the horizontal and vertical directions of the liquid flow in the plane can be obtained. This device can be used to measure the flow force of the vertical pile protruding from the liquid surface in the horizontal flow or the liquid flow obliquely intersecting the pile and the unsteady flow. Moreover, none of the above-mentioned three measuring devices can be used to measure the flow resistance and the axial force of the pile when the inclined pile flows down the pile in a horizontal or oblique direction.

However, for problems such as the effect of water flow on the diversion pier when the diversion pier is set on the overflow dam surface, the effect of the water flow on the hydraulic structure in the slope channel, and the force on the columns or pedestrians on the urban water-logged slope and steps, etc., The cylinder (or other object to be flowed) is not vertical but in an oblique state, and in the above cases, the liquid flow is often an unsteady flow. Object) in the horizontal or oblique to flow around the test force measurement is limited.

Contents of the invention

The technical problem to be solved by the present invention is to provide a force measuring device for the pile flow test, which can be used for vertical or oblique piles protruding from the liquid surface, flowing in the horizontal or oblique direction, Measure the flow resistance around the pile and the force along the axial direction of the pile.

The technical means adopted by the present invention to solve the technical problems are: the device includes a bracket, a pile, a rotating mechanism, a first limiting mechanism, a second limiting mechanism, a third limiting mechanism, a first tension and pressure sensor, a second A tension-pressure sensor and a third tension-pressure sensor; the rotating mechanism includes a first connecting shaft, a first bearing, a first bearing support, a second bearing and a second bearing support, and the pile is fixedly connected to the first connecting shaft, The first connecting shaft is arranged horizontally and perpendicular to the plane of the liquid flow. The first bearing support and the second bearing support are symmetrically arranged on both sides of the pile. The first bearing and the second bearing are respectively installed on the first In the bearing support and the second bearing support, the first connecting shaft passes through the first bearing and the second bearing respectively; the first limit mechanism is fixedly connected with the bracket, and the upper connection of the first tension and pressure sensor is connected with the first The limit mechanism is fixedly connected, and the lower connection of the first tension-compression sensor is fixedly connected with the first bearing support and the second bearing support respectively through the first connecting rod, and the first limit mechanism is used to make the first tension-compression sensor The upper connection of the sensor and the lower connection of the first tension-pressure sensor are located in the same liquid flow plane, and the connection line between the upper connection of the first tension-pressure sensor and the lower connection of the first tension-pressure sensor is a vertical line The second limit mechanism is fixedly connected to the bracket, the first connection of the second tension-compression sensor is fixedly connected to the second limit mechanism, and the second connection of the second tension-compression sensor is respectively connected to the first connection rod through the second connecting rod. A bearing support and a second bearing support are fixedly connected, and the second limit mechanism is used to make the first connection of the second tension-pressure sensor and the second connection of the second tension-pressure sensor both be located in the liquid flow In the flow plane, the connecting line between the first connection of the second tension-compression sensor and the second connection of the second tension-compression sensor is a horizontal line; the third limit mechanism is fixedly connected to the bracket, and the first connection of the third tension-compression sensor The two ends of the first connection and the second connection of the third tension-compression sensor are respectively fixedly connected with the third limit mechanism and the pile, wherein the second connection of the third tension-compression sensor is located above the first connection shaft, And the sum of the inclination angle of the first connection of the third tension-pressure sensor and the second connection of the third tension-pressure sensor relative to the horizontal plane and the inclination angle of the pile relative to the horizontal plane is 90°, the third The limit mechanism is used to make the third tension-compression sensor only receive force in the direction of the line connecting the first connection of the third tension-compression sensor and the second connection of the third tension-compression sensor during operation.

Further, the first limit mechanism of the present invention can be composed of a third bearing, a third bearing support and a third connecting shaft, the third bearing is installed in the third bearing support, and the upper connection of the first tension-pressure sensor It is fixedly connected with the third bearing support, the third connecting shaft passes through the third bearing and the third connecting shaft is fixedly connected with the bracket; in addition, the first limiting mechanism of the present invention can also be composed of the second slider and the second Composed of guide rails, the second slider is fixedly connected to the upper joint of the first tension-compression sensor, the second guide rail is fixedly connected to the bracket, and the second slider can slide reciprocally along the second guide rail.

Further, the second limit mechanism of the present invention can be composed of a fourth bearing, a fourth bearing support and a fourth connecting shaft, the first connection of the second tension and pressure sensor is fixedly connected with the fourth bearing support, and the second The four bearings are installed in the fourth bearing support, the fourth connecting shaft passes through the fourth bearing and the fourth connecting shaft is fixedly connected with the bracket; in addition, the second limiting mechanism of the present invention can also be composed of the third slider and the first Composed of three guide rails, the third slider is fixedly connected to the first joint of the second tension-compression sensor, the third guide rail is fixedly connected to the bracket, and the third slider can slide reciprocally along the third guide rail.

Further, the third limiting mechanism of the present invention may be composed of a fifth bearing, a fifth bearing support, a fifth connecting shaft, a sixth bearing, a sixth bearing support, a fifth connecting shaft and a sixth connecting shaft, The fifth bearing is installed in the fifth bearing support, the sixth bearing is installed in the sixth bearing support, the fifth connecting shaft passes through the fifth bearing, the sixth connecting shaft passes through the sixth bearing, the fifth bearing support and The sixth bearing support is fixedly connected through the third connecting rod, the sixth connecting shaft is fixedly connected with the bracket, and the fifth connecting shaft is fixedly connected with the first connection of the third tension-compression sensor through the fourth connecting rod; in addition, the present invention The third limit mechanism described above can also be composed of a fourth slide block and a fourth guide rail, the fourth slide block is fixedly connected to the first joint of the third tension-compression sensor, the fourth guide rail is fixedly connected to the bracket, and the fourth slide block can Slide back and forth along the fourth guide rail.

Further, the bracket of the present invention also includes a semicircular sliding guide rail and a first slider, the first slider can slide reciprocally along the semicircular sliding guide rail, the third limit mechanism is fixedly connected with the first slider, and the first The slide block is fixedly connected with the semicircular sliding guide rail by screws.

Further, the present invention also includes a display, and the input terminals of the display are respectively electrically connected to the output terminals of the first tension-compression sensor, the second tension-compression sensor and the third tension-compression sensor.

Further, in the present invention, the second tension-compression sensor is located on the upstream side of the pile, and the third tension-compression sensor is located on the downstream side of the pile.

Compared with the force measuring device of the existing pile flow test, the present invention has the following beneficial effects:

(1) The device of the present invention uses a limit mechanism and a rotating structure to make each tension-compression sensor only receive the force in the direction of the connection between the two joints of the tension-compression sensor, which can ensure the accuracy of the measurement result and the stability of the measurement process;

(2) In the flow test of the device of the present invention, the component forces of the liquid flow force on the vertical or oblique piles in three non-collinear directions are measured by three tension and pressure sensors respectively, thus The device of the present invention is applicable to the force measurement of the vertical or oblique pile liquid flow circumvention test;

(3) Further, the device of the present invention can adjust the inclination angle of the pile to be tested by adjusting the relative position of the first slider and the semicircular sliding guide rail, and fixing it with the screw on the first slider, and can be used for different inclinations The measurement of the flow force of the angled pile flow test;

(4) The device of the present invention is simple to manufacture, low in cost and easy to install.

Description of drawings

Fig. 1 is the schematic view of the use state of the first embodiment of the device of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the left view of Fig. 1;

Fig. 4 is a schematic diagram of the use state of the second embodiment of the device of the present invention;

Figure 5 is a top view of Figure 4;

Fig. 6 is the left view of Fig. 4;

Fig. 7 is the connection diagram of the third tension and pressure sensor and pile;

In the figure, 1. bracket, 2. pile, 3. rotating mechanism, 4. first limit mechanism, 5. second limit mechanism, 6. third limit mechanism, 7. first tension and pressure sensor, 8 .The second tension and pressure sensor, 9. The third tension and pressure sensor, 10. The first connecting shaft, 11. The first bearing, 12. The first bearing support, 13. The second bearing support, 14. The second bearing, 16. The fourth connecting shaft, 17. The fourth bearing, 18. The fourth bearing support, 19. The fifth connecting shaft, 20. The fifth bearing, 21. The fifth bearing support, 22. The sixth connecting shaft, 23 .The sixth bearing, 24. The sixth bearing support, 25. The third connecting shaft, 26. The third bearing, 27. The third bearing support, 28. The first connecting rod, 29. The second connecting rod, 30. Semicircular sliding guide rail, 31. screw, 32. first slider, 33. wire, 35. display, 36. canal bottom, 37. second guide rail, 38. second slider, 39. third slider, 40. The third guide rail, 41. The fourth slide block, 42. The fourth guide rail, 43. The third connecting rod, 44. The fourth connecting rod.

Detailed ways:

As shown in Figures 1 to 6, the force measuring device of the present invention mainly includes a bracket 1, a pile 2, a rotating mechanism 3, a first limiting mechanism 4, a second limiting mechanism 5, a third limiting mechanism 6, a A tension and pressure sensor 7 , a second tension and pressure sensor 8 and a third tension and pressure sensor 9 . Further, a display 35 may also be included. In the pile flow test, the pile 2 used is usually a long column. Wherein, the rotating mechanism 3 includes a first connecting shaft 10 , a first bearing 11 , a first bearing support 12 , a second bearing 14 and a second bearing support 13 . The pile 2 is fixedly connected with the first connecting shaft 10, and the first connecting shaft 10 is arranged horizontally and perpendicular to the plane of the liquid flow. It should be noted that, in the present invention, the plane of the liquid flow means that the pile 2 is placed Before entering the flow, the plane where the flow direction of the test liquid flow (that is, the flow direction of the liquid flow) is located. The first bearing support 12 and the second bearing support 13 are symmetrically arranged on both sides of the pile 2, the first bearing 11 is installed in the first bearing support 12, and the second bearing 14 is installed in the second bearing support 13 , the first connecting shaft 10 passes through the first bearing 11 and the second bearing 14 at the same time. It should be noted that, in the present invention, the connection point of the tension-compression sensor refers to the intersection point (or called "connection point") on the tension-compression sensor when it is connected with other components. Wherein, the upper connection of the first tension-pressure sensor 7 is fixedly connected with the first limit mechanism 4, and the lower connection of the first tension-pressure sensor 7 is respectively connected to the first bearing support 12 and the second bearing through the first connecting rod 28. The support 13 is fixedly connected, and the first limiting mechanism 4 is fixedly connected to the bracket 1 . Thus, the first limit mechanism 4 makes the connection of the upper connection end of the first tension-pressure sensor 7 and the lower connection of the first tension-pressure sensor 7 be located in the same liquid flow direction plane, and the connection of the first tension-pressure sensor 7 The connecting line between the upper connection and the lower connection of the first tension-pressure sensor 7 is a vertical line. The second limit mechanism 5 is fixedly connected with the support 1, the first connection of the second tension-compression sensor 8 is fixedly connected with the second limit mechanism 5, and the second connection of the second tension-compression sensor 8 is passed through the second connecting rod 29 are fixedly connected with the first bearing support 12 and the second bearing support 13 respectively. Thus, the second limit mechanism 5 makes the first connection point of the second tension-pressure sensor 8 and the second connection point of the second tension-pressure sensor 8 both be located in the liquid flow direction plane, and the second tension-pressure sensor 8 The connecting line connecting the first connection of the second tension-pressure sensor 8 and the second connection of the second tension-pressure sensor 8 is a horizontal line. In the present invention, the bracket 1, the rotating mechanism 3, the first limit mechanism 4, the second limit mechanism 5, the first connecting rod 28 and the second connecting rod 29 work together to prevent the pile 2 from being flat in the flow direction plane. so that the pile 2 can rotate around the first connection axis 10 in the flow direction plane. The third limit mechanism 6 is fixedly connected to the bracket 1, the first connection of the third tension-pressure sensor 9 is fixedly connected to the third limit mechanism 6, and the second connection of the third tension-pressure sensor 9 is fixedly connected to the pile 2 , wherein the second connection of the third tension-pressure sensor 9 to the pile 2 is located above the first connection axis 10 . The third limit mechanism 6 can make the third tension-compression sensor 9 only be subjected to the force in the line direction of the first connection of the third tension-compression sensor 9 and the second connection of the third tension-compression sensor 9 during the working process . As shown in Figure 7, the inclination angle of the connection line of the first joint A of the third tension-compression sensor 9 and the second joint B of the third tension-compression sensor 9 with respect to the horizontal plane is β , and the inclination angle of the pile 2 relative to the horizontal plane The angle of inclination is α, and α+ β =90°, thus, in the working process of the device of the present invention, the line of action of the force that the pile 2 transmits to the third tension-compression sensor 9 is the same as that of the third tension-compression sensor 9 The connecting line of the first connection A and the second connection B of the third tension-compression sensor 9 coincides, so that the joint action of the bracket 1 and the third limit mechanism 6 prevents the pile 2 from winding around the first connection axis in the flow direction plane 10 turns. The first tension-pressure sensor 7 , the second tension-pressure sensor 8 and the third tension-pressure sensor 9 can be S-type tension-pressure sensors.

Fig. 1, Fig. 2 and Fig. 3 are schematic views of the use state of the first embodiment of the device of the present invention. The first limiting mechanism 4 is composed of a third bearing 26 , a third bearing support 27 and a third connecting shaft 25 . Wherein, the third bearing 26 is installed in the third bearing support 27, the upper joint of the first tension-pressure sensor 7 is fixedly connected with the third bearing support 27, the third connecting shaft 25 passes through the third bearing 26 and the third The connecting shaft 25 is fixedly connected with the bracket 1 . The second limiting mechanism 5 is composed of a fourth bearing 17 , a fourth bearing support 18 and a fourth connecting shaft 16 . Wherein, the first joint of the second tension-pressure sensor 8 is fixedly connected with the fourth bearing support 18, the fourth bearing 17 is installed in the fourth bearing support 18, the fourth connecting shaft 16 passes through the fourth bearing 17 and the fourth The four connecting shafts 16 are fixedly connected with the bracket 1 . The third limit mechanism 6 is composed of a fifth bearing 20 , a fifth bearing support 21 , a fifth connecting shaft 19 , a sixth bearing 23 , a sixth bearing support 24 and a sixth connecting shaft 22 . The fifth bearing 20 is installed in the fifth bearing support 21, the sixth bearing 23 is installed in the sixth bearing support 24, the fifth connecting shaft 19 passes through the fifth bearing 20, and the sixth connecting shaft 22 passes through the sixth bearing 23. The fifth bearing support 21 and the sixth bearing support 24 are fixedly connected through the third connecting rod 43, the sixth connecting shaft 22 is fixedly connected with the bracket 1, and the fifth connecting shaft 19 is connected with the third pulley through the fourth connecting rod 44. The first connection of the pressure sensor 9 is fixedly connected.

Fig. 4, Fig. 5 and Fig. 6 are schematic views of the use state of the second embodiment of the device of the present invention. Wherein, the first limit mechanism 4 is composed of a second slide block 38 and a second guide rail 37, the upper joint of the second slide block 38 and the first tension-compression sensor 7 is fixedly connected, and the second guide rail 37 is fixedly connected with the bracket 1, The second slider 38 can slide back and forth along the second guide rail 37 . The second limit mechanism 5 is composed of a third slide block 39 and a third guide rail 40, the first joint of the third slide block 39 and the second tension-compression sensor 8 is fixedly connected, the third guide rail 40 is fixedly connected with the bracket 1, and the third guide rail 40 is fixedly connected with the support 1. The three sliders 39 can slide back and forth along the third guide rail 40 . The third limit mechanism 6 is composed of a fourth slide block 41 and a fourth guide rail 42, the first joint of the fourth slide block 41 and the third tension-compression sensor 9 is fixedly connected, the fourth guide rail 42 is fixedly connected with the bracket 1, and the fourth guide rail 42 is fixedly connected with the bracket 1. The four sliders 41 can slide back and forth along the fourth guide rail 42 .

As shown in Figures 1 to 6, as a preferred embodiment of the present invention, the bracket 1 can also include a semicircular sliding guide rail 30, a first slider 32 and a screw 31, wherein the first slider 32 can move along the semicircular The sliding guide rail 30 slides reciprocally, the first slider 32 is fixedly connected to the semicircular sliding guide rail 30 through screws 31 , and the third limiting mechanism 6 is fixedly connected to the first slider 32 . Thus, the inclination angle α of the pile 2 can be adjusted by moving the first sliding block 32 along the semicircular sliding guide rail 30 , and the first sliding block 32 can be fixed on the semicircular sliding guide rail 30 by using the screws 31 .

When the present invention works, the second tension and pressure sensor 8 is on the upstream side of the pile 2, and the third tension and pressure sensor 9 is on the backflow side of the pile 2. By measuring the pile 2 in the plane of the incoming flow, the first The force received by the first tension-compression sensor 7, the second tension-compression sensor 8 and the third tension-compression sensor 9 can obtain the pile 2 under the action of the horizontal incoming flow or the liquid flow obliquely intersecting the pile 2. Force size.

The input terminals of the display are electrically connected to the output terminals of the first tension-compression sensor 7 , the second tension-compression sensor 8 and the third tension-compression sensor 9 through wires 33 . The first tension-compression sensor 7 , the second tension-compression sensor 8 and the third tension-compression sensor 9 transmit measurement signals to different channels of the display 35 through wires 33 , thereby synchronously displaying the measured values of the forces on the tension-compression sensors. Decompose the resultant force of the first tension-pressure sensor 7, the second tension-pressure sensor 8, and the third tension-pressure sensor 9, wherein the component force along the flow direction of the liquid flow and perpendicular to the pile 2 is the force that the pile 2 receives The flow resistance, the component force along the axial direction of the pile 2 is the force acting on the pile 2 along the axial direction of the pile 2 . Therefore, the device of the present invention can be used for the force measurement of the vertical or oblique pile 2 in the flow test around the pile 2 under the action of the horizontal or oblique intersecting liquid flow.

When the device of the present invention is working, the pile 2 is under the action of an unsteady flow, and the flow around the pile 2 changes with time. The first tension-compression sensor 7, the second tension-compression sensor 8 and the third tension-compression sensor 9 can simultaneously measure the pile 2 The dynamic change process of the applied force, and the measurement data of each sensor are displayed synchronously and dynamically through the display 35. Therefore, the device of the present invention can not only be used for the measurement of the flow around the pile 2 under constant flow, but also can be used for the pile 2 under non-constant flow. The force measurement around the flow.

To sum up, the pile 2 is placed in the test fluid flow, so that the second tension-compression sensor 8 is on the upstream side of the pile 2 , and the third tension-compression sensor 9 is on the downstream side of the pile 2 . By changing the relative position of the first sliding block 32 of the device of the present invention on the semicircular sliding guide rail 30, the inclination angle α of the pile 2 can be adjusted. When the liquid flow bypasses the pile 2, the first tension-pressure sensor 7, the second tension-pressure sensor 8, and the third tension-pressure sensor 9 transmit the measurement signals to different channels of the display 35 through the wire 33, thereby synchronously displaying the The measured value of the pressure sensor. By decomposing the resultant force of the force on the first tension-compression sensor 7, the second tension-compression sensor 8 and the third tension-compression sensor 9, the flow resistance of the pile 2 and the edge of the pile 2 can be obtained respectively. Axial force of pile 2. Thus, by displaying the measurement data of each tension and pressure sensor on the display 35, the dynamic change process of the horizontal or oblique liquid flow force that the vertical or oblique pile 2 is subjected to can be obtained, which can be used for the vertical or oblique pile 2 Force measurements for liquid flow bypass tests under constant or unsteady flow.

The first limit mechanism, the second limit mechanism and the third limit mechanism of the above different structures can be used in any combination in the force measuring device of the present invention, and are not limited to the first embodiment and the second embodiment above. Combination method.

Claims (10)

1. an acting force measurement mechanism that streams test for pile, is characterized in that: comprise support (1), pile (2), rotating mechanism (3), the first position-limit mechanism (4), the second position-limit mechanism (5), the 3rd position-limit mechanism (5), the first tension-compression sensor (7), the second tension-compression sensor (8) and the 3rd tension-compression sensor (9), described rotating mechanism (3) comprises the first coupling shaft (10), clutch shaft bearing (11), clutch shaft bearing bearing (12), the second bearing (14) and the second bearing spider (13), pile (2) is fixedly connected with the first coupling shaft (10), the first coupling shaft (10) is horizontally disposed with and flows to plane perpendicular to liquid stream, be placed in the symmetrically both sides of pile (2) of clutch shaft bearing bearing (12) and the second bearing spider (13), clutch shaft bearing (11), the second bearing (14) is installed on respectively in clutch shaft bearing bearing (12) and the second bearing spider (13) accordingly, the first coupling shaft (10) is through clutch shaft bearing (11) and the second bearing (14), described the first position-limit mechanism (4) is fixedly connected with support (1), the upper junction of the first tension-compression sensor (7) is fixedly connected with the first position-limit mechanism (4), the lower junction of the first tension-compression sensor (7) is fixedly connected with the second bearing spider (13) with clutch shaft bearing bearing (12) respectively by head rod (28), described the first position-limit mechanism (4) is positioned at same liquid stream for the lower junction of the upper junction that makes the first tension-compression sensor (7) and the first tension-compression sensor (7) and flows to plane, the line of the lower junction of the upper junction of the first tension-compression sensor (7) and the first tension-compression sensor (7) is vertical curve, described the second position-limit mechanism (5) is fixedly connected with support (1), the first junction of the second tension-compression sensor (8) is fixedly connected with the second position-limit mechanism (5), the second junction of the second tension-compression sensor (8) is fixedly connected with the second bearing spider (13) with clutch shaft bearing bearing (12) respectively by the second connecting link (29), described the second position-limit mechanism (5) all is positioned at described liquid stream for the second junction of the first junction of making the second tension-compression sensor (8) and the second tension-compression sensor (8) and flows to plane, the line of the second junction of the first junction of the second tension-compression sensor (8) and the second tension-compression sensor (8) is horizontal line, the 3rd position-limit mechanism (6) is fixedly connected with support (1), the second junction of the first junction of described the 3rd tension-compression sensor (9) and the 3rd tension-compression sensor (9) is fixedly connected with pile (2) with the 3rd position-limit mechanism (6) respectively accordingly, wherein, the second junction of the 3rd tension-compression sensor (9) is positioned at the top of the first coupling shaft (10), and angle of inclination with respect to the horizontal plane of the line of the second junction of the first junction of the 3rd tension-compression sensor (9) and the 3rd tension-compression sensor (9) and pile (2) angle of inclination with respect to the horizontal plane and be 90 °, described the 3rd position-limit mechanism (6) is for making the 3rd tension-compression sensor (9) only be subject in the course of the work the acting force of line direction of the second junction of the first junction of the 3rd tension-compression sensor (9) and the 3rd tension-compression sensor (9).

2. acting force measurement mechanism according to claim 1, it is characterized in that: described the first position-limit mechanism (4) is comprised of the 3rd bearing (26), the 3rd bearing spider (27) and the 3rd coupling shaft (25), the 3rd bearing (26) is installed in the 3rd bearing spider (27), the upper junction of the first tension-compression sensor (7) is fixedly connected with the 3rd bearing spider (27), and the 3rd coupling shaft (25) is fixedly connected with support (1) through the 3rd bearing (26) and the 3rd coupling shaft (25).

3. acting force measurement mechanism according to claim 1, it is characterized in that: described the first position-limit mechanism (4) is comprised of the second slide block (38) and the second guide rail (37), the second slide block (38) is fixedly connected with the upper junction of the first tension-compression sensor (7), the second guide rail (37) is fixedly connected with support (1), and the second slide block (38) can reciprocatingly slide along the second guide rail (37).

4. acting force measurement mechanism according to claim 1, it is characterized in that: described the second position-limit mechanism (5) is comprised of the 4th bearing (17), the 4th bearing spider (18) and the 4th coupling shaft (16), the first junction of the second tension-compression sensor (8) is fixedly connected with the 4th bearing spider (18), the 4th bearing (17) is installed in the 4th bearing spider (18), and the 4th coupling shaft (16) is fixedly connected with support (1) through the 4th bearing (17) and the 4th coupling shaft (16).

5. acting force measurement mechanism according to claim 1, it is characterized in that: described the second position-limit mechanism (5) is comprised of the 3rd slide block (39) and the 3rd guide rail (40), the 3rd slide block (39) is fixedly connected with the first junction of the second tension-compression sensor (8), the 3rd guide rail (40) is fixedly connected with support (1), and the 3rd slide block (39) can reciprocatingly slide along the 3rd guide rail (40).

6. acting force measurement mechanism according to claim 1, it is characterized in that: described the 3rd position-limit mechanism (6) is by the 5th bearing (20), the 5th bearing spider (21), the 5th coupling shaft (19), the 6th bearing (23), the 6th bearing spider (24) and the 6th coupling shaft (22) form, the 5th bearing (20) is installed in the 5th bearing spider (21), the 6th bearing (23) is installed in the 6th bearing spider (24), the 5th coupling shaft (19) is through the 5th bearing (20), the 6th coupling shaft (22) is through the 6th bearing (23), the 5th bearing spider (21) is fixedly connected with by third connecting rod (43) with the 6th bearing spider (24), the 6th coupling shaft (22) is fixedly connected with support (1), the 5th coupling shaft (19) is fixedly connected with the first junction of the 3rd tension-compression sensor (9) by the 4th connecting rod (44).

7. acting force measurement mechanism according to claim 1, it is characterized in that: described the 3rd position-limit mechanism (6) is comprised of Four-slider (41) and the 4th guide rail (42), Four-slider (41) is fixedly connected with the first junction of the 3rd tension-compression sensor (9), the 4th guide rail (42) is fixedly connected with support (1), and Four-slider (41) can reciprocatingly slide along the 4th guide rail (42).

8. acting force measurement mechanism according to claim 1, it is characterized in that: described support (1) also comprises semicircle rail plate (30), the first slide block (32) and screw (31), the first slide block (32) can reciprocatingly slide along semicircle rail plate (30) (the first slide block (32) forms and is slidably matched with semicircle rail plate (30)), the 3rd position-limit mechanism (6) is fixedly connected with the first slide block (32), and the first slide block (32) is fixedly connected with by screw (31) with semicircle rail plate (30).

9. acting force measurement mechanism according to claim 1, it is characterized in that: also comprise display (35), the input end of described display is electrically connected to the output terminal of described the first tension-compression sensor (7), the second tension-compression sensor (8) and the 3rd tension-compression sensor (9) respectively.

10. acting force measurement mechanism according to claim 1 is characterized in that: described the second tension-compression sensor (8) is met stream one side in pile (2), and the back of the body of the 3rd tension-compression sensor (9) in pile (2) flows a side.

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