A reading system for static load testing

Abstract

The application discloses a kind of reading system for static load test applied to the field of foundation pile test, including laser transmitter fixedly installed in the edge of the top of test pile and reading assembly connected to the lower end of steel beam, reading assembly includes reading device, prism and telescopic rod with locking device, the light emitted by laser transmitter reaches the surface of prism, is received by reading device after being reflected by prism, the settlement (pulling amount) of test pile is converted into the offset distance of light spot on reading device by prism, direct, accurate quantification of displacement is realized, by adjusting telescopic rod, prism can be accurately located in the appropriate receiving position of laser transmitter side, can adapt to different test conditions and installation spacing, through the linkage design of telescopic sleeve, light / heavy plate, inelastic belt and single air pressure monitoring assembly, multiple stability problems such as structure connection loosening and telescopic rod locking failure can be simultaneously monitored in real time, improve the accuracy of test results.

Description

Technical Field

[0001] This invention relates to the field of pile foundation testing, and in particular to a measurement system for static load testing. Background Technology

[0002] The static load test of a single pile involves uniformly transferring a vertical load to the foundation pile of a building, measuring the settlement (uplift) of the pile top under different loads, obtaining the Q-s curve and auxiliary curves such as s-lg t from the static load test, and then deriving parameters such as the characteristic value of the vertical compressive (uplift) bearing capacity of the single pile based on the curves.

[0003] In static load tests, the load acting on the pile is generally provided by a reaction device. The ease of use of the reaction device directly affects the test process and results. Commonly used reaction devices include surcharge reaction devices and anchor pile reaction devices. A surcharge reaction device involves setting up a load-bearing platform on the top of the pile using a steel beam, placing a weight on it, and then gradually lifting the platform using jacks placed on the pile head, thereby applying force to the pile. The main beam of the reaction device can be made of structural steel or a self-fabricated box girder. The shape of the platform can be square or rectangular as needed. The weight used for surcharge can be sandbags, precast concrete blocks, etc.

[0004] Currently, the measurement of pile top displacement in static load tests mainly relies on equipment such as mechanical dial gauges, electronic displacement gauges, or displacement sensors based on laser ranging. Among them, mechanical dial gauges require the installation of a reference beam and a magnetic support, which is greatly limited by site conditions and is easily affected by factors such as vibration and temperature. Although electronic displacement gauges have high accuracy, their long-term stability is significantly affected by environmental temperature and humidity, and they still require a stable area to set up and maintain the measurement point, making it extremely difficult to provide and guarantee the testing site. Summary of the Invention

[0005] The core of this invention lies in converting the vertical displacement of the test pile into the horizontal offset distance of the light spot on the measuring device, thereby achieving direct, high-precision, and automated measurement of the displacement. This invention has a wide range of applications and high flexibility in on-site installation. Through the linkage mechanism of the telescopic sleeve, light / heavy plates, non-elastic band, and a single air pressure monitoring component, it solves the problems in existing technologies where relying on a reference pile to fix the measuring equipment leads to difficulties in accurate measurement due to numerous interference factors affecting multiple aspects of the measuring system, including the ground and reference pile, as well as various stability issues such as loose connections and failure of telescopic rod locking. This effectively ensures real-time monitoring.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A reading system for static load testing includes a laser emitter fixedly installed on the edge of the top of a test pile and a reading assembly connected to the lower end of a steel beam. The reading assembly includes a reading device, a prism, and a telescopic rod with a locking device. The upper end of the reading device and the telescopic rod are connected to the same mounting plate. The mounting plate is connected to the steel beam by at least one of a magnetic suction device or a fastening assembly. The prism is connected to the lower end of the telescopic rod and is located to the side of the laser emitter. The light emitted by the laser emitter reaches the surface of the prism and is received by the reading device after being reflected by the prism.

[0008] Furthermore, a telescopic sleeve is provided between the prism and the mounting plate, which is parallel to the telescopic rod. The telescopic sleeve includes multiple sleeves that are connected in an inner and outer sliding manner. The innermost sleeve closest to the prism is rotatably connected to a lower rotating shaft and an upper rotating shaft, with the upper rotating shaft located above the lower rotating shaft. Lightweight plates and heavy plates are fixedly connected to the cylindrical ends of both the lower and upper rotating shafts. A pressure monitoring component is provided between the lower and upper rotating shafts.

[0009] Furthermore, both the mounting plate and the prism are provided with a movable plate and a fixed plate between them and the telescopic rod. The two ends of the telescopic rod and the telescopic sleeve are respectively fixedly connected to a pair of fixed plates. The movable plate is located between the pair of fixed plates and is slidably sleeved on the outer end of the telescopic rod and the telescopic sleeve.

[0010] Furthermore, the prism includes a support and a mirror body fixedly connected to the side of the support. The moving plate, the fixed plate and the support, as well as the moving plate, the fixed plate and the mounting plate are all connected by the first bolt.

[0011] Furthermore, a groove is provided at one end of the fixed plate near the moving plate, and an end ball is placed inside the groove. The end ball in the lower groove is fixedly connected to the lightweight plate on the lower rotating shaft by an inelastic band, and the end ball in the upper groove is also fixedly connected to the heavyweight plate on the upper rotating shaft by an inelastic band. The weight of the lightweight plate is less than the weight of the heavyweight plate.

[0012] Furthermore, the lower end of the innermost sleeve and the upper end of the outermost sleeve are provided with perforations and rope channels, and the perforations are connected to the inside of the sleeve. A rubber plate is fixedly connected to the end face of the moving plate near the fixed plate. The non-elastic band passes through the perforations, rope channels and the gap between the rubber plate and the fixed plate in sequence.

[0013] Furthermore, the air pressure monitoring component includes a side platform fixedly connected to the inner wall of the sleeve. An air bladder and a flat plate are fixedly connected to the end of the side platform away from the sleeve, and the flat plate is located inside the air bladder. An inner cavity is opened inside the side platform. An air pressure sensor is fixedly connected to the inner wall of the inner cavity. An air hole is opened on the inner wall of the inner cavity for communicating with the air bladder and the inner cavity.

[0014] Furthermore, both ends of the lower and upper rotating shafts are movably connected through the sleeve and extend to the outside. The ends of the lower and upper rotating shafts that are far apart from each other are fixedly connected to handles. The other ends of the lower and upper rotating shafts are rotatably connected to outer cylinders, and the outer cylinders are connected to the outer ends of the sleeves. An annular groove is opened at the inner end of the outer cylinder. The outer ends of the lower and upper rotating shafts are fixedly connected to limiting rings that match the annular grooves.

[0015] Furthermore, each of the moving plate and the fixed plate has a side plate fixedly connected to a pair of side ends, and the upper and lower pair of side plates are connected by a second bolt.

[0016] Compared with the prior art, the advantages of this invention are: (1) This scheme converts the vertical displacement of the test pile into the offset distance of the light spot on the measuring device through the prism, realizing the direct and accurate quantification of the displacement. The measuring device and the prism are connected by the telescopic rod, so that the prism can be accurately located at a suitable receiving position on the side of the laser emitter. It can adapt to different test conditions and installation spacing, and has a wide range of applications.

[0017] (2) The telescopic rod, prism and mounting plate are made detachable, which makes it easy to replace prisms of different sizes or telescopic rods of different strokes as needed. It also makes it easy to replace the measuring device, which significantly improves the maintainability and versatility of the system.

[0018] (3) Through the linkage design of telescopic sleeve, light / heavy plate, non-elastic band and single air pressure monitoring component, it can simultaneously monitor three key stability issues affecting measurement accuracy in real time: loose connection between prism and telescopic rod, loose connection between mounting plate and telescopic rod, and unexpected elongation caused by failure of telescopic rod locking device. It can detect prism position deviation in time, effectively reduce measurement errors caused by structural instability, and improve the accuracy of test results. Attached Figure Description

[0019] Figure 1 For the use of the present invention Figure 1 ; Figure 2 For the use of the present invention Figure 2 ; Figure 3 The three-dimensional representation of the present invention Figure 1 ; Figure 4 The three-dimensional representation of the present invention Figure 2 ; Figure 5 This is a partial perspective view of the telescopic sleeve and its internal structure of the present invention; Figure 6 This is a perspective view of the air pressure monitoring component of the present invention; Figure 7 This is a partial perspective view of the invention during disassembly and assembly; Figure 8 This is a partial front view of the present invention after installation; Figure 9 This is a partial front view of the telescopic sleeve and its internal structure according to the present invention. Figure 10 This is a partial front view of the structure of the present invention when the first bolt between the prism and the telescopic rod becomes loose. Figure 11 This is a partial front view of the structure of the present invention when the first bolt between the mounting plate and the telescopic rod becomes loose. Figure 12 This is a partial front view of the telescopic rod self-locking device of the present invention when it becomes loose. Figure 13 This is a partial perspective view of the moving plate and the fixed plate of the present invention.

[0020] Explanation of the labels in the diagram: 1. Measuring device, 2. Telescopic rod, 3. Prism, 31. Mirror body, 32. Support, 4. Mounting plate, 5. Telescopic sleeve, 51. Sleeve, 5101. Rope threading channel, 52. Retaining ring, 6. Moving plate, 601. Rubber plate, 7. Fixed plate, 701. Groove, 8. Lower rotating shaft, 9. Upper rotating shaft, 10. Air pressure monitoring component, 1001. Side platform, 1002. Airbag, 1003. Flat plate, 1004. Inner cavity, 1005. Air pressure sensor, 1006. Air hole, 11. Lightweight plate, 12. Heavyweight plate, 13. Non-elastic band, 14. End ball, 15. Side plate, 16. Outer cylinder, 17. Limiting ring. Detailed Implementation

[0021] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0022] First implementation method: Please see Figures 1-3 A measurement system for static load testing is characterized by comprising a laser emitter fixedly installed on the edge of the top of a test pile and a measurement assembly connected to the lower end of a steel beam. The measurement assembly includes a measurement device 1, a prism 3, and a telescopic rod 2 with a locking device. The upper end of the measurement device 1 and the telescopic rod 2 are fixedly connected to the same mounting plate 4. The mounting plate 4 is connected to the steel beam by at least one of a magnetic attraction device (such as a magnet, not shown in the figure) or a fastening component (such as a bolt). The prism 3 is fixedly connected to the lower end of the telescopic rod 2 and is located to the side of the laser emitter. The light emitted by the laser emitter reaches the surface of the prism 3, is reflected by the prism 3, and is received by the measurement device 1, forming a clear and measurable light spot on the measurement device 1. The measurement device 1 converts the position information of the light spot into an electrical signal, processes the electrical signal, and calculates the coordinates of the light spot.

[0023] Please see Figures 1-2When the test pile sinks, the height of the space where the laser emitter is located decreases, and the landing point of the emitted light on the inclined surface of the prism 3 also decreases. As a result, the landing point of the light reflected to the measuring device 1 is horizontally offset from the initial landing point. In this invention, the angle between the inclined surface of the prism 3 used to receive the light and the horizontal plane can be set to 45°, so that the physical offset distance L2 of the light landing point on the measuring device 1 is the sinking height L1 of the test pile. Therefore, the sinking amount of the test pile can be obtained by obtaining the value of L2.

[0024] During installation, the telescopic rod 2 is adjusted in length and locked to ensure that the lower prism 3 is precisely positioned to the side of the laser emitter and in a suitable receiving position. This invention is applicable to various testing conditions and effectively improves the scope of application of the invention.

[0025] Second implementation method: This embodiment, based on the first embodiment, sets the fixed connection between the telescopic rod 2, the mounting plate 4, and the prism 3 to a detachable connection. This allows for monitoring of the connection stability between the telescopic rod 2 and the mounting plate 4, the prism 3, and the stability of the telescopic rod 2 itself. The specific structural setup is as follows: Please see Figures 4-5 Between the prism 3 and the mounting plate 4, there is also a telescopic sleeve 5 distributed parallel to the telescopic rod 2. The telescopic sleeve 5 includes multiple sleeves 51 that are connected in an inner and outer sliding manner. Except for the innermost layer, the inner walls of the other sleeves 51 are provided with sliding grooves. Except for the outermost layer, the outer walls of the other sleeves 51 are fixedly connected with sliders. The slider on one sleeve 51 is slidably connected to the sliding groove of the adjacent outer sleeve 51, so that the adjacent sleeves 51 are not easy to rotate or completely separate. The innermost sleeve 51 closest to the prism 3 is rotatably connected to a lower rotating shaft 8 and an upper rotating shaft 9, and the upper rotating shaft 9 is located above the lower rotating shaft 8. The cylindrical ends of the lower rotating shaft 8 and the upper rotating shaft 9 are fixedly connected to a lightweight plate 11 and a heavy plate 12. A pressure monitoring component 10 is provided between the lower rotating shaft 8 and the upper rotating shaft 9.

[0026] Please see Figure 4 and Figure 7 Both the mounting plate 4 and the prism 3 are provided with a movable plate 6 and a fixed plate 7 between them and the telescopic rod 2. The two ends of the telescopic rod 2 and the telescopic sleeve 5 are respectively fixedly connected to a pair of fixed plates 7. The movable plate 6 is located between the pair of fixed plates 7 and is slidably sleeved on the outer end of the telescopic rod 2 and the telescopic sleeve 5. The prism 3 includes a support 32 and a mirror body 31 fixedly connected to the side end of the support 32. The mirror body 31 serves to receive laser light. The support 32 serves to connect the telescopic rod 2 and the telescopic sleeve 5. The movable plate 6, the fixed plate 7 and the support 32, as well as the movable plate 6, the fixed plate 7 and the mounting plate 4, are all connected by the first bolt.

[0027] Please see Figures 7-9A groove 701 is provided at one end of the fixed plate 7 near the moving plate 6. An end ball 14 is placed inside the groove 701. The end ball 14 in the lower groove 701 is fixedly connected to the lightweight plate 11 on the lower rotating shaft 8 by an inelastic band 13. Similarly, the end ball 14 in the upper groove 701 is fixedly connected to the heavy plate 12 on the upper rotating shaft 9 by an inelastic band 13. The weight of the lightweight plate 11 is less than the weight of the heavy plate 12. The lightweight plate 11 can be made of plastic, and the heavy plate 12 can be made of metal. The innermost sleeve 51 and the outermost sleeve 51 are both provided with perforations and rope channels 5101, and the perforations are connected to the inside of the sleeve 51. A rubber plate 601 is fixedly connected to the end face of the moving plate 6 near the fixed plate 7. The non-elastic band 13 passes through the perforations, rope channels 5101 and the gap between the rubber plate 601 and the fixed plate 7 in sequence. The diameter of the end ball 14 is larger than the width of the perforation opening, so that the non-elastic band 13 is not easy to completely enter the inside of the sleeve 51 due to accident.

[0028] The monitoring principles for multiple stability parameters in this implementation method are as follows: Please see Figure 9 In the initial state, both the lightweight plate 11 and the heavy plate 12 are horizontal and symmetrical about the vertical plane containing the central axis of the lower rotating shaft 8. The inelastic band 13 is locally pressed between the rubber plate 601 and the end face of the fixed plate 7. The inelastic band 13 inside the sleeve 51 is nearly straight, while the inelastic band 13 inside the groove 701 is relaxed. Because the inelastic band 13 is pressed by the rubber plate 601, the weight of the heavy plate 12 cannot drive the lower rotating shaft 8 and the upper rotating shaft 9 to rotate. The lightweight plate 11 and the heavy plate 12 remain horizontal, and the air pressure monitoring component 10 is not squeezed by external force, so the air pressure data it monitors remains stable. Please see Figure 10 When the first bolt on the prism 3 loosens, the moving plate 6 and the fixed plate 7 gradually loosen and can no longer maintain a tight fit, giving the inelastic band 13 between them room to move. At this time, the heavier plate 12 will drive the lower rotating shaft 8 to rotate downward to a vertical position, so that the light plate 11 rotates upward to a vertical position. The inelastic band 13, which is in a movable state, can adapt to the rotation of the light plate 11. After the rotation, the light plate 11 squeezes the air pressure monitoring component 10, causing the air pressure data it monitors to change significantly. Please see Figure 11 Similarly, when the first bolt on the mounting plate 4 loosens, the moving plate 6 and the fixed plate 7 gradually loosen, and the heavier plate 12 will drive the lower rotating shaft 8 to rotate downward to a vertical state. The inelastic band 13, which is in a movable state, can adapt to the rotation of the heavy plate 12. After the rotation, the heavy plate 12 will squeeze the air pressure monitoring component 10, causing the air pressure data it monitors to change significantly. Please see Figure 12Since there is no locking device on the telescopic sleeve 5, its length will change synchronously with the extension and retraction of the telescopic rod 2. When the locking device on the telescopic rod 2 is loosened, the telescopic rod 2 will easily elongate to a certain extent due to the gravity of the suspended prism 3. When the telescopic rod 2 elongates, the length of the telescopic sleeve 5 elongates synchronously. At this time, the distance between the outermost upper sleeve 51 and the innermost lower sleeve 51 will increase accordingly. If the first bolt is not loosened, the non-elastic band 13 cannot move automatically. At this time, the extension operation of the telescopic sleeve 5 will overcome the gravity of the heavy plate 12, causing the heavy plate 12 on the upper rotating shaft 9 to rotate upward, so that the reserved non-elastic band 13 can adapt to the extension of the telescopic sleeve 5. At this time, the downward rotation of the light plate 11 on the upper rotating shaft 9 will squeeze the air pressure monitoring component 10, causing the air pressure data it monitors to change significantly. Therefore, this embodiment, through the above-described structural design, firstly achieves a detachable arrangement between the measuring device 1, the telescopic rod 2, and the prism 3. In actual use, the prism 3 of a suitable size and the telescopic rod 2 of a suitable telescopic stroke can be rotated for installation and use. At the same time, it facilitates the replacement of the measuring device 1, greatly improving the maintainability and applicability of the present invention. Secondly, a single air pressure monitoring component 10 can simultaneously monitor the connection stability between the telescopic rod 2 and the mounting plate 4, the connection stability between the telescopic rod 2 and the prism 3, and the stability of the telescopic rod 2 itself. This effectively reduces the situation where the positional displacement of the prism 3 is not detected in time due to poor structural stability, thereby effectively improving the accuracy of the test results of the present invention.

[0029] Please see Figure 6The air pressure monitoring component 10 includes a side platform 1001 fixedly connected to the inner wall of the sleeve 51. An air bladder 1002 and a flat plate 1003 are fixedly connected to the end of the side platform 1001 away from the sleeve 51, with the flat plate 1003 located inside the air bladder 1002. The air bladder 1002 is inflated with a gas filling degree of 70-80%, making it less prone to rupture under pressure. An inner cavity 1004 is formed inside the side platform 1001. A air pressure sensor 1005 is fixedly connected to the inner wall of the inner cavity 1004. An air hole 1006 is formed on the inner wall of the inner cavity 1004, connecting the air bladder 1002 and the inner cavity 1004. When the lightweight plate 11 or the heavy plate 12 faces... When the pressure monitoring component 10 rotates to a vertical position, the two components will compress the airbag 1002, causing a change in the air pressure inside the space composed of the airbag 1002, the air hole 1006, and the inner cavity 1004. At this time, the monitoring data of the pressure sensor 1005 will change significantly. The plate 1003 does not contact the inner wall of the airbag 1002 and does not affect the flow of gas inside the airbag 1002. The plate 1003 approaches contact with the vertically positioned lightweight plate 11 or heavy plate 12. Its function is to limit the rotation of the lightweight plate 11 or heavy plate 12, so that the instantaneous rotational inertia of the two will not easily cause excessive compression of the airbag 1002.

[0030] Please see Figure 13 Both ends of the lower rotating shaft 8 and the upper rotating shaft 9 are movably connected through the sleeve 51 and extend to the outside. The ends of the lower rotating shaft 8 and the upper rotating shaft 9 that are far apart from each other are fixedly connected to handles. The other ends of the lower rotating shaft 8 and the upper rotating shaft 9 are rotatably connected to an outer cylinder 16, and the outer cylinder 16 is connected to the outer end of the sleeve 51. An annular groove is opened at the inner end of the outer cylinder 16. The outer ends of the lower rotating shaft 8 and the upper rotating shaft 9 are fixedly connected to a limiting ring 17 that matches the annular groove. Through the cooperation of the limiting ring 17 and the annular groove, the corresponding lower rotating shaft 8 and the upper rotating shaft 9 are limited, so that the lower rotating shaft 8 and the upper rotating shaft 9 are not easy to move radially along the sleeve 51, thus realizing the stable rotation of the two.

[0031] A retaining ring 52 is fixedly connected to the outer end of the innermost sleeve 51 on the lower side. The retaining ring 52 is located on the upper side of the upper rotating shaft 9. When the telescopic sleeve 5 retracts, the retaining ring 52 limits the movement of the upper sleeve 51. That is, the part of the sleeve 51 below the retaining ring 52 cannot be retracted into the interior of the upper sleeve 51, so that the upper sleeve 51 is less likely to collide with the upper rotating shaft 9.

[0032] The third implementation method: Please see Figure 13 Both the moving plate 6 and the fixed plate 7 have a pair of side plates 15 fixedly connected to their respective sides, and the upper and lower pair of side plates 15 are connected by a second bolt.

[0033] This embodiment, through the provision of the side plate 15, facilitates the initial setting of the lightweight plate 11, the heavy plate 12, and the non-elastic band 13, as detailed below: Step 1: Before installing the first bolt (i.e., before connecting the telescopic rod 2 to the mounting plate 4 and the telescopic rod 2 to the prism 3), adjust the length of the telescopic rod 2 and lock it according to the distance between the laser emitter and the steel beam; Step 2: At this time, the length of the telescopic sleeve 5 is also fixed. Slide the moving plate 6 away from the fixed plate 7 to create enough space between them to facilitate the operation of the inelastic band 13. Then manually turn the handle on the lower rotating shaft 8 to make the light plate 11 and the heavy plate 12 horizontal. Keep this state still and pull the inelastic band 13 outward to loosen the excess inelastic band 13 and place it inside the groove 701. The inelastic band 13 inside the sleeve 51 will tend to be straight. Then slide the moving plate 6 downward to make it fit tightly against the fixed plate 7. At this time, the rubber plate 601 is pressed tightly against the inelastic band 13 on the end face of the fixed plate 7. Finally, connect and fix the side plate 15 on the moving plate 6 and the fixed plate 7 with the second bolt to keep the moving plate 6 and the fixed plate 7 in a fitted state. Step 3: Using the same operation as in Step 2, adjust the positions of the lightweight plate 11, heavy plate 12, and non-elastic band 13 at the other end of the telescopic sleeve 5, and connect and fix the moving plate 6 and the fixed plate 7. Step 4: Attach the fixed plate 7 at one end to the mounting plate 4, and fix the moving plate 6 and the fixed plate 7 to the mounting plate 4 with the first bolt. After the first bolt is tightened, remove the second bolt from the moving plate 6 and the fixed plate 7. The fixed plate 7 at the other end is attached to the support 32, and the movable plate 6 and the fixed plate 7 are fixed to the support 32 by the first bolt. After the first bolt is tightened, the second bolt on the movable plate 6 and the fixed plate 7 is removed.

[0034] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A measurement system for static load testing, characterized in that: The test pile includes a laser emitter fixedly installed on the top edge of the test pile and a reading assembly connected to the lower end of the steel beam. The reading assembly includes a reading device (1), a prism (3), and a telescopic rod (2) with a locking device. The upper end of the reading device (1) and the telescopic rod (2) are connected to the same mounting plate (4). The mounting plate (4) is connected to the steel beam by at least one of a magnetic suction device or a fastening assembly. The prism (3) is connected to the lower end of the telescopic rod (2) and is located to the side of the laser emitter. The light emitted by the laser emitter reaches the surface of the prism (3) and is received by the reading device (1) after being reflected by the prism (3).

2. The measurement system for static load testing according to claim 1, characterized in that: Between the prism (3) and the mounting plate (4), there is also a telescopic sleeve (5) distributed parallel to the telescopic rod (2). The telescopic sleeve (5) includes multiple sleeves (51) that are connected in an inner and outer sliding manner. The innermost sleeve (51) near the prism (3) is rotatably connected to a lower rotating shaft (8) and an upper rotating shaft (9). The upper rotating shaft (9) is located on the upper side of the lower rotating shaft (8). The cylindrical ends of the lower rotating shaft (8) and the upper rotating shaft (9) are fixedly connected to a light plate (11) and a heavy plate (12). A pressure monitoring component (10) is provided between the lower rotating shaft (8) and the upper rotating shaft (9).

3. The measurement system for static load testing according to claim 2, characterized in that: The mounting plate (4) and the prism (3) are both provided with a movable plate (6) and a fixed plate (7) between them and the telescopic rod (2). The two ends of the telescopic rod (2) and the telescopic sleeve (5) are respectively fixedly connected to a pair of fixed plates (7). The movable plate (6) is located between a pair of fixed plates (7) and is slidably sleeved on the outer end of the telescopic rod (2) and the telescopic sleeve (5).

4. The measurement system for static load testing according to claim 3, characterized in that: The prism (3) includes a support (32) and a mirror body (31) fixedly connected to the side of the support (32). The moving plate (6), the fixed plate (7) and the support (32) are all connected by a first bolt.

5. A measurement system for static load testing according to claim 3, characterized in that: The fixed plate (7) has a groove (701) at one end near the moving plate (6). An end ball (14) is placed inside the groove (701). The end ball (14) in the lower groove (701) is fixedly connected to the light plate (11) on the lower rotating shaft (8) by an inelastic band (13). The end ball (14) in the upper groove (701) is also fixedly connected to the heavy plate (12) on the upper rotating shaft (9) by an inelastic band (13). The weight of the light plate (11) is less than the weight of the heavy plate (12).

6. The measurement system for static load testing according to claim 5, characterized in that: The lower end of the innermost sleeve (51) and the upper end of the outermost sleeve (51) are provided with perforations and rope passages (5101), and the perforations are connected to the inside of the sleeve (51). A rubber plate (601) is fixedly connected to the end face of the moving plate (6) near the fixed plate (7). The non-elastic band (13) passes through the perforations, the rope passages (5101), and the gap between the rubber plate (601) and the fixed plate (7) in sequence.

7. A measurement system for static load testing according to claim 6, characterized in that: The air pressure monitoring component (10) includes a side platform (1001) fixedly connected to the inner wall of the sleeve (51). An airbag (1002) and a plate (1003) are fixedly connected to one end of the side platform (1001) away from the sleeve (51), and the plate (1003) is located inside the airbag (1002). An inner cavity (1004) is opened inside the side platform (1001). An air pressure sensor (1005) is fixedly connected to the inner wall of the inner cavity (1004). An air hole (1006) is opened on the inner wall of the inner cavity (1004). The air hole (1006) is used to connect the airbag (1002) and the inner cavity (1004).

8. A measurement system for static load testing according to claim 2, characterized in that: Both ends of the lower rotating shaft (8) and the upper rotating shaft (9) are movably connected through the sleeve (51) and extend to the outside. The ends of the lower rotating shaft (8) and the upper rotating shaft (9) that are far apart from each other are fixedly connected to handles. The other ends of the lower rotating shaft (8) and the upper rotating shaft (9) are rotatably connected to an outer cylinder (16), and the outer cylinder (16) is connected to the outer end of the sleeve (51). The inner end of the outer cylinder (16) is provided with an annular groove. The outer ends of the lower rotating shaft (8) and the upper rotating shaft (9) are fixedly connected to a limiting ring (17) that matches the annular groove.

9. A measurement system for static load testing according to claim 2, characterized in that: The moving plate (6) and the fixed plate (7) are each fixedly connected to a pair of side plates (15), and the upper and lower pairs of side plates (15) are connected by a second bolt.

Images