LU101876B1

LU101876B1 - Bridge pier testing device

Info

Publication number: LU101876B1
Application number: LU101876A
Authority: LU
Inventors: Jun Zhang; Chuan Wen; Fu Liu; Guisheng Jiang; Xiaotong Zhao; Yibin Li; Yaming Lu; Xinrong Zhang; Min Ye
Original assignee: Changan Univ
Priority date: 2018-11-19
Filing date: 2019-02-14
Publication date: 2020-10-26
Also published as: CN110331661A; CN110331661B; LU101876A1; WO2020103344A1

Abstract

The present invention provides a bridge pier testing device based on an electromagnetic spring technique, including an upper clamping mechanism, a lower clamping mechanism and a traction mechanism. The structure of the upper clamping mechanism is identical to the structure of the lower clamping mechanism. The upper clamping mechanism includes a housing, an upper clamping body and a lower clamping body. A ring top plate of the upper clamping body is fixedly mounted on a top fixed ring plate. The lower clamping body can axially move up and down inside the housing. The clamping electromagnet magnetically attracts the clamping iron block, so that the lower clamping body moves axially upward, and the wedge-shaped push head pushes the clamping support body to move radially inwards, so as to clamp the bridge pier. The traction electromagnet is energized to attract the traction iron block. The traction iron block pulls the traction rope so that the lower clamping mechanism moves axially relative to the upper clamping mechanism. The device of the present invention uses a powerful mechanical clamping mechanism to clamp the bridge pier, and the clamping mechanism can bear a large dead load without slipping during the testing process, which has good stability.

Description

lu101876

BRIDGE PIER TESTING DEVICE

TECHNICAL FIELD The present invention belongs to the field of bridge pier testing, and relates to a bridge pier testing device. Specifically, the present invention relates to a bridge pier testing device based on an electromagnetic spring technique.

BACKGROUND In recent years, transportation in China has been developed on a large scale. A viaduct built based on the bridge pier is critical to a high-speed railway or a bridge. Current tests available for testing bridge piers, however, are generally accomplished manually via a rebound hammer or radar with the aid of aerial work platforms or crane platforms, and people are hoisted for inspection. This testing method is costly and restricted by terrain conditions, is difficult to be applied to some areas such as mountain areas where cranes are inaccessible, cannot achieve the periodic safety inspection of the structure of the bridge pier, and cannot perform timely maintenance, which is difficult to ensure the safety of the bridge. It is, therefore, imperative to develop a bridge pier testing device. In the prior art, there are many applications of climbing devices in other fields, such as climbing devices with vertical ladders, climbing devices with a double- helix configuration, climbing devices with wheels, etc. These climbing devices, | however, have the following shortcomings when used in the testing of bridge piers. 1.

Traditional climbing devices have low applicability since different bridge piers bear different loads and have different diameters and specifications. 2. The traditional climbing devices are cumbersome and have complex climbing mechanisms, and are difficult to be made waterproof since the motor is contained in the power mechanism. However, the climbing device must be waterproof when testing the bridge pier underwater. 3. The traditional climbing mechanisms only play the climbing role, and can only bear a small load and thus cannot carry heavy equipment for testing. 4. The traditional climbing mechanisms and clamping mechanisms are difficult to achieve automatic control. 101876

SUMMARY In view of the above-mentioned shortcomings and deficiencies of the prior art, an objective of the present invention is to provide a bridge pier testing device based on an electromagnetic spring technique to solve the technical problem that the testing devices in the prior art are likely to slip when bearing a large force.

In order to solve the above-mentioned technical problems, the present invention is realized by adopting the following technical solutions: A bridge pier testing device based on an electromagnetic spring technique includes a bridge pier testing sensor, an upper clamping mechanism, a lower clamping mechanism and a traction mechanism. The structure of the upper clamping mechanism is identical to the structure of the lower clamping mechanism.

The upper clamping mechanism includes a housing, an upper clamping body and a lower clamping body. Each of the housing, the upper clamping body and the lower clamping body is divided into two symmetrical parts with respect to the axial plane where the diameter of the housing, the upper clamping body and the lower clamping body is located. The adjacent ends of the two symmetrical parts of the upper clamping body are connected by a hinge. The other adjacent ends of the two symmetrical parts of the upper clamping body are detachably connected by a connecting end plate.

The adjacent ends of the two symmetrical parts of the lower clamping body are connected by a hinge. The other adjacent ends of the two symmetrical parts of the lower clamping body are detachably connected by a connecting end plate.

| The two ends of the housing are open. The top of the housing is fixed to a top fixed | ring plate. The bottom end of the housing is fixed to a bottom limit ring plate. A ring top plate of the upper clamping body is fixedly mounted on the top fixed ring plate. The lower clamping body is sleeved between the upper clamping body and the bottom limit ring plate inside the housing. The lower clamping body can axially move up and down inside the housing.

The upper clamping body includes the ring top plate, an inner ring wall and an 101876 outer ring wall arranged coaxially. The top ends of the inner ring wall and the outer ring wall are fixed to the ring top plate. A clamping cavity with an open bottom is provided between the inner ring wall and the outer ring wall. An upper pier channel is formed between the ring top plate and the center of the inner ring wall.

“A plurality of clamping support body mounting holes are symmetrically formed on the inner ring wall. À clamping support body is mounted in each clamping support body mounting hole. The clamping support body includes a radial push rod matched with the clamping support body mounting hole. One end of the radial push rod extending into the upper pier channel is provided with a clamping push head matched with the bridge pier. The other end of the radial push rod located in the clamping cavity is provided with an upper slope.

The clamping cavity is provided with a plurality of clamping electromagnets fixed on the bottom surface of the ring top plate.

A plurality of mounting holes are symmetrically formed on the ring top plate.

The lower clamping body includes a ring bottom plate. À lower pier channel is formed in the center of the ring bottom plate. The lower pier channel and the upper pier channel are coaxially arranged and have the same inner diameter.

A plurality of wedge-shaped push heads matched with the clamping support body are symmetrically arranged on the top surface of the ring bottom plate. The wedge- shaped push head is provided with a lower slope matched with the upper slope.

A plurality of clamping iron blocks matched with the clamping electromagnet are symmetrically arranged on the top surface of the ring bottom plate. The clamping electromagnet magnetically attracts the clamping iron block, so that the lower clamping body moves axially upward, and the wedge-shaped push head pushes the clamping support body to move radially inwards, so as to clamp the bridge pier. | A plurality of spring through holes arranged coaxially with the mounting holes are symmetrically formed on the top surface of the ring bottom plate.

The traction mechanism includes a traction shaft mounted in the mounting hole of u101876 the upper clamping mechanism. A rope through hole is formed in the traction shaft along the axial direction. A traction electromagnet is mounted on the portion of the traction shaft extending from and adjacent to the ring top plate of the upper clamping mechanism. A traction iron block is sleeved on the traction shaft and can move along the traction shaft.

The end of the traction shaft extending into the clamping cavity is fixed to one end of an axial reset spring. The other end of the axial reset spring passes through the spring through hole of the upper clamping mechanism and is fixed to the mounting hole on the ring top plate of the lower clamping mechanism. One end of the traction rope is fixedly mounted on the traction iron block. The other end of the traction rope passes through the rope through hole and the axial reset spring, and is fixed on the mounting hole of the ring top plate of the lower clamping mechanism. The traction electromagnet is energized to attract the traction iron block. The traction iron block pulls the traction rope so that the lower clamping mechanism moves axially relative to the upper clamping mechanism.

The bridge pier testing sensor is mounted in the upper pier channel.

The present invention further has the following technical features: The inner wall of the housing is provided with a guide groove along the axial direction. The side wall of the lower clamping body is provided with a guide rail engaged with the guide groove.

A reset spring is mounted between the radial push rod and the inner ring wall.

A rubber layer is arranged on the clamping push head.

The radial push rod includes a mounting section and a telescopic section. The telescopic section is arranged in the mounting section and is locked by a fastening bolt, so that the length of the radial push rod can be adjusted. The telescopic section is connected to the clamping push head.

A rope receiving groove is formed at the end of the traction shaft extending from the ring top plate of the upper clamping mechanism. 101876 The traction iron block includes an inner iron block and an outer iron block. A sliding channel matched with the traction shaft is formed in the center of the inner iron block. The end of the inner iron block away from the traction electromagnet is provided with a limit flange. The outer iron block is sleeved on the inner iron block and is limited by the limit flange. The height of the inner iron block is greater than the height of the outer iron block.

The traction iron block has a multi-stage structure. Another outer iron block is also sleeved on the outer iron block and is limited by a limit flange. The height of the outer iron block is gradually reduced from inside to outside. The traction rope is fixed in a traction rope mounting hole of the outermost outer iron block.

Compared with the prior art, the present invention has the following advantages: (1) The device of the present invention uses a powerful mechanical clamping mechanism to clamp the bridge pier, and the clamping mechanism can bear a large dead load without slipping during the testing process, which has good stability.

(2) The present invention uses the electromagnet in conjunction with the spring to provide power, has a simple working process without non-waterproof materials such as a motor and thus can be made waterproof to realize the underwater testing of the bridge pier.

(3) The device of the present invention has applicability to handle the bridge piers with different diameters, the bridge piers of different diameter specifications can be clamped by adjusting the length of the clamping support body, which has a wide application range, simple operation, small size and is light in weight.

(4) The electromagnet only needs to control the on and off of the power to realize traction and clamping, and thus is easy to realize automation.

(5) The device of the present invention can replace manual testing to solve the problems of low efficiency of manual testing and the danger of working aloft or underwater.

BRIEF DESCRIPTION OF THE DRAWINGS u101876 FIG. 1 is a schematic diagram showing the overall structure of the present invention.

FIG. 2 is a top view of the present invention.

FIG. 3 is a schematic diagram showing the internal structure of the upper clamping mechanism.

FIG. 4 is a structural schematic diagram of the housing.

FIG. 5 is a structural schematic diagram of the upper clamping body.

FIG. 6 is a structural schematic diagram of the lower clamping body.

FIG. 7 is a structural schematic diagram of the clamping support body.

FIG. 8 is a schematic diagram showing the internal structure of the traction mechanism.

FIG. 9 is a schematic diagram showing the structure of the traction mechanism located outside the ring top plate.

FIG. 10 is a schematic diagram showing the internal structure of the traction mechanism located outside the ring top plate.

FIG. 11 is a structural schematic diagram of the traction iron block.

FIG. 12 is a schematic diagram showing the internal structure of the traction iron block.

The reference numerals in the figures: 1-upper clamping mechanism, 2-lower clamping mechanism, 3-traction mechanism, 4-bridge pier testing sensor; 101-housing, 102-upper clamping body, 103-lower clamping body, 104-hinge, 105-connecting end plate, 106-top fixed ring plate, 107-bottom limit ring plate, 108- guide groove, 109-guide rail; 10201-ring top plate, 10202-inner ring wall, 10203-outer ring wall, 10204- clamping cavity, 10205-upper pier channel, 10206-clamping support body mounting hole, 10207-clamping support body, 10208-upper slope, 10209-clamping electromagnet, 10210-mounting hole, 10211-reset spring; eee

1020701 -radial push rod, 1020702-clamping push head, 1020703-rubber layer; lu101876 102070101-mounting section, 102070102-telescopic section, 102070103- fastening bolt; 10301-ring bottom plate, 10302-lower pier channel, 10303-wedge-shaped push head, 10304-lower slope, 10305-clamping iron block, 10306-spring through hole; 301-traction shaft, 302-rope through hole, 303-traction electromagnet, 304- traction iron block, 305-axial reset spring, 306-traction rope, 307-rope receiving groove, 308-traction rope mounting hole; and 30401-inner iron block; 30402-outer iron block; 30403-sliding channel; 30404- limit flange.

The specific content of the present invention will be further illustrated in detail hereinafter with reference to the drawings and embodiments.

DETAILED DESCRIPTION OF THE EMBODIMENTS The specific embodiments of the present invention will be described hereinafter. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made based on the technical solutions of the present invention shall fall within the scope of protection of the present invention.

Embodiment 1 According to the above-mentioned technical solution, the present embodiment provides a bridge pier testing device based on an electromagnetic spring technique, as shown in FIGS. 1-12. The bridge pier testing device includes the bridge pier testing sensor, the upper clamping mechanism 1, the lower clamping mechanism 2 and the traction mechanism 3. The structure of the upper clamping mechanism 1 is identical to the structure of the lower clamping mechanism 2.

The upper clamping mechanism 1 includes the housing 101, the upper clamping body 102 and the lower clamping body 103. Each of the housing 101, the upper clamping body 102 and the lower clamping body 103 is divided into two symmetrical — ————————

parts with respect to the axial plane where the diameter of the housing 101, the upper lu101876 clamping body 102 and the lower clamping body 103 is located. The adjacent ends of the two symmetrical parts of the housing 101 are connected by the hinge 104. The other adjacent ends of the two symmetrical parts of the housing 101 are detachably connected by the connecting end plate 105. The adjacent ends of the two symmetrical parts of the lower clamping body 103 are connected by the hinge 104. The other adjacent ends of the two symmetrical parts of the lower clamping body 103 are detachably connected by the connecting end plate 105.

The two ends of the housing 101 are open. The top of the housing 101 is fixed to the top fixed ring plate 106. The bottom end of the housing 101 is fixed to the bottom limit ring plate 107. The ring top plate 10201 of the upper clamping body 102 is fixedly mounted on the top fixed ring plate 106. The lower clamping body 103 is sleeved between the upper clamping body 102 and the bottom limit ring plate 107 inside the housing 101. The lower clamping body 103 can axially move up and down inside the housing 101.

The upper clamping body 102 includes the ring top plate 10201, the inner ring wall 10202 and the outer ring wall 10203 arranged coaxially. The top ends of the inner ring wall 10202 and the outer ring wall 10203 are fixed to the ring top plate 10201. The clamping cavity 10204 with an open bottom is provided between the inner ring wall 10202 and the outer ring wall 10203. The upper pier channel 10205 is formed between the ring top plate 10201 and the center of the inner ring wall 10202.

A plurality of clamping support body mounting holes 10206 are symmetrically formed on the inner ring wall 10202. The clamping support body 10207 is mounted in each clamping support body mounting hole 10206. The clamping support body 10207 includes the radial push rod 1020701 matched with the clamping support body mounting hole 10206. One end of the radial push rod 1020701 extending into the upper pier channel 10205 is provided with the clamping push head 1020702 matched with the bridge pier. The other end of the radial push rod 1020701 located in the clamping cavity

10204 is provided with the upper slope 10208. 4101876 The clamping cavity 10204 is provided with a plurality of clamping electromagnets 10209 fixed on the bottom surface of the ring top plate 10201.

A plurality of mounting holes 10210 are symmetrically formed on the ring top plate 10201.

The lower clamping body 103 includes the ring bottom plate 10301. The lower pier channel 10302 is formed in the center of the ring bottom plate 10301. The lower | pier channel 10302 and the upper pier channel 10205 are coaxially arranged and have the same inner diameter.

A plurality of wedge-shaped push heads 10303 matched with the clamping support body are symmetrically arranged on the top surface of the ring bottom plate 10301. The wedge-shaped push head 10303 is provided with the lower slope 10304 matched with the upper slope.

A plurality of clamping iron blocks 10305 matched with the clamping electromagnet 10209 are symmetrically arranged on the top surface of the ring bottom plate 10301. The clamping electromagnet 10209 magnetically attracts the clamping iron block 10305, so that the lower clamping body 102 moves axially upward, and the wedge-shaped push head 10303 pushes the clamping support body 10207 to move radially inwards, so as to clamp the bridge pier.

A plurality of spring through holes 10306 arranged coaxially with the mounting holes 10210 are symmetrically formed on the top surface of the ring bottom plate 10301.

The traction mechanism 3 includes the traction shaft 301 mounted in the mounting hole 10210 of the upper clamping mechanism 1. The rope through hole 302 is formed in the traction shaft 301 along the axial direction. The traction electromagnet 303 is mounted on the portion of the traction shaft 301 extending from and adjacent to the ring top plate 10201 of the upper clamping mechanism 1. The traction iron block 304 is sleeved on the traction shaft 301 and can move along the traction shaft 301.

The end of the traction shaft 301 extending into the clamping cavity 10204 is fixed to one end of the axial reset spring 305. The other end of the axial reset spring 305 lu101876 passes through the spring through hole 10306 of the upper clamping mechanism 1 and is fixed to the mounting hole 10210 on the ring top plate 10201 of the lower clamping mechanism 2. One end of the traction rope 306 is fixedly mounted on the traction iron block 304. The other end of the traction rope 306 passes through the rope through hole 302 and the axial reset spring 305, and is fixed on the mounting hole 10210 of the ring top plate 10201 of the lower clamping mechanism 2. The traction electromagnet 10209 | is energized to attract the traction iron block 304. The traction iron block 304 pulls the traction rope 306 so that the lower clamping mechanism 2 moves axially relative to the upper clamping mechanism 1.

The bridge pier testing sensor 4 is mounted in the upper pier channel 10205.

As a preferred solution of the present embodiment, the bridge pier testing sensor 4 is mounted on the clamping push head 1020702 in the upper pier channel 10205 to be more adjacent to the bridge pier, so that the testing result is more accurate. The bridge pier testing sensor 4 can employ commonly used bridge pier testing sensors or data collectors as needed, such as sonar, probes, etc.

As a preferred solution of the present embodiment, the adjacent ends of the two symmetrical parts of the upper clamping body 102 are connected by the hinge 104. The other adjacent ends of the two symmetrical parts of the upper clamping body 102 are detachably connected by the connecting end plate 105. Through the hinge 104, the whole device can be handily divided into two halves and thus is convenient to be quickly mounted on or disassembled from the bridge pier. The connecting end plate 105 on the upper clamping body 102 and the connecting end plate 105 on the housing 201 can be stacked together and fixedly connected by a bolt.

As a preferred solution of the present embodiment, the inner wall of the housing 101 is provided with the guide groove 108 along the axial direction. The side wall of the lower clamping body 103 is provided with the guide rail 109 engaged with the guide groove 108. In this way, the lower clamping body 103 does not rotate along the circumferential direction during the repeated axial movement, thus ensuring accurate lu101876 alignment between the upper and lower components.

As a preferred solution of the present embodiment, the reset spring 10211 is mounted between the radial push rod 1020701 and the inner ring wall 10202. In this way, it is convenient to quickly reset the entire clamping support body 10207.

| As a preferred solution of the present embodiment, the rubber layer 1020703 is arranged on the clamping push head 1020702. The rubber layer 1020703 acts as a buffer, so that the clamping push head 1020702 and the bridge pier can be better fitted and fixed. The rubber layer 1020703 also plays a role in anti-sliding, so that the overall load-bearing capacity is increased.

As a preferred solution of the present embodiment, the radial push rod 1020701 includes the mounting section 102070101 and the telescopic section 102070102. The telescopic section 102070102 is arranged in the mounting section 102070101 and is locked by the fastening bolt 102070103, so that the length of the radial push rod 1020701 can be adjusted. The telescopic section 102070102 is connected to the clamping push head 1020702. In this way, the length of the radial push rod 1020701 can be telescopically adjusted to better fit various bridge piers.

As a preferred solution of the present embodiment, the rope receiving groove 307 is formed at the end of the traction shaft 301 extending from the ring top plate 10201 of the upper clamping mechanism 1 to better distribute the rope and evenly bear the force.

As a preferred solution of the present embodiment, the traction iron block includes the inner iron block 30401 and the outer iron block 30402. The sliding channel 30403 matched with the traction shaft 301 is formed in the center of the inner iron block 30401. The end of the inner iron block 30401 away from the traction electromagnet 303 is provided with the limit flange 30404. The outer iron block 30402 is sleeved on the inner iron block 30401 and is limited by the limit flange 30404. The height of the inner iron block 30401 is greater than the height of the outer iron block 30402. More preferably,

EE the traction iron block 304 has a multi-stage structure. Another outer iron block is also u101876 sleeved on the outer iron block 30402 and is limited by a limit flange. The height of the multi-stage outer iron block is gradually reduced from inside to outside. The traction rope 306 is fixed in the traction rope mounting hole 308 of the outermost outer iron block.

By adopting the multi-stage structure, the traction stroke of the traction rope 306 can be increased, and the traction electromagnet 10209 can magnetically attract the traction iron block 304 stage by stage, to ensure that the attraction capacity is not affected by a large distance between the traction electromagnet 10209 and the traction iron block 304.

The device of the present invention is installed by the following steps before use: Step 1, the upper clamping bodies 102 in the upper clamping mechanism 1 and the lower clamping mechanism 2 are mounted, the set bolt of the connecting end plate 105 in the upper clamping body 102 is unbolted, the upper clamping body 102 is mounted on the bridge pier, and the set bolt is further fastened.

Step 2, according to the diameter of the bridge pier, the fastening bolt 102070103 is adjusted to further adjust the relative position between the mounting section 102070101 and the telescopic section 102070102, to adjust the length of the clamping body 10207, so that the clamping push head 1020702 is at an appropriate clamping position from the surface of the bridge pier.

Step 3, installation of the lower clamping body 103, the set bolt of the connecting end plate 105 in the lower clamping body 103 is unbolted, the lower clamping body 103 is mounted on the bridge pier, and the set bolt is further fastened.

Step 4, the housing 101 is mounted, the top fixed ring plate 106 and the ring top plate 10201 on the upper clamping body 102 are connected by a fixing bolt, the engagement between the guide groove 108 and the guide rail 109 is checked to determine whether the guide rail 109 can slide up and down in the guide groove 108.

Step 5, the bridge pier testing sensor 4 is triggered to perform testing on the bridge pier. lu101876 The device of the present invention is operated by the following steps: Step 6, the clamping electromagnet 10209 of the upper clamping mechanism 1 is energized to electromagnetically attract the clamping iron block 10305 of the upper clamping mechanism 1 upward, at this time, the lower clamping body 103 moves upward, the wedge-shaped push head 10303 pushes the clamping support body 10207 into the upper pier channel 10205 through the upper slope 10208 and the lower slope 10304 matched with each other, the rubber layer 1020703 is fitted with the surface of the bridge pier, so that the upper clamping mechanism 1 is clamped on the bridge pier. At this time, the lower clamping mechanism 1 is not clamped on the bridge pier.

Step 7, the traction electromagnet 303 of the traction mechanism 3 is energized to electromagnetically attract the inner iron block 30401 downward, when the inner iron block 30401 contacts the traction electromagnet 303, the outer iron block 30402 continues to be attracted to move on the inner iron block 30401, the traction rope 306 connected to the outer iron block 30402 is driven to execute a traction movement to compress the axial reset spring 305 and concurrently drive the lower clamping mechanism 2 to ascend relative to the upper clamping mechanism 1.

Step 8, after the traction mechanism 3 completes the traction, the lower clamping mechanism 2 is energized in the same way as that in step 6 to clamp the upper clamping mechanism 1 on the bridge pier.

Step 9, the clamping electromagnet 10209 of the upper clamping mechanism 1 is de-energized, and the clamping support body 10207 returns to the initial position through the compressed reset spring 10211, meanwhile, the lower clamping body 103 is released and falls onto the bottom limit ring plate 107, and the upper clamping mechanism 1 is disengaged from the bridge pier and is in an unclamped state. The disengagement process between the lower clamping mechanism and the bridge pier is the same as the above process. At the same time, the rebound force of the compressed axial reset spring 305 pushes the upper clamping mechanism 1 upward to complete a creeping climbing process along the bridge pier. 4101876 Step 10, steps 6-9 are repeated to allow the electromagnet to be continuously energized and de-energized until the upper clamping mechanism 1 climbs to the limit position of the bridge pier and ceases to ascend.

| Step 11, after the test is completed, the whole device descends. During the descent process, the upper clamping mechanism 1 and the lower clamping mechanism 2 are clamped on and disengaged from the bridge pier in the same manner as the creeping climbing process. The difference thereof 1s as follows. The lower clamping mechanism 2 is clamped on the bridge pier first, and the upper clamping mechanism 1 is disengaged from the bridge pier first. Then, the traction mechanism 3 performs traction so that the upper clamping mechanism 1 moves downward relative to the lower clamping mechanism 2, and the axial reset spring 305 is compressed at the same time. Finally, the upper clamping mechanism 1 is clamped on the bridge pier, the lower clamping mechanism 2 is disengaged from the bridge pier, and the rebound force of the compressed axial reset spring 305 pushes the lower clamping mechanism 2 downward to complete a creeping descent process along the bridge pier.

Step 12, step 11 is repeated to allow the electromagnet to be continuously energized and de-energized until the lower clamping mechanism 2 descends to the bottom position of the bridge pier, to complete the working process of the bridge pier testing device based on the electromagnetic spring technique.

Claims

CLAIMS lu101876 WHAT IS CLAIMED IS:

1. A bridge pier testing device based on an electromagnetic spring technique, comprising: a bridge pier testing sensor (4), an upper clamping mechanism (1), a lower clamping mechanism (2) and a traction mechanism (3); characterized in that, a structure of the upper clamping mechanism (1) is identical to a structure of the lower clamping mechanism (2); the upper clamping mechanism (1) comprises a housing (101), an upper clamping body (102) and a lower clamping body (103); each of the housing (101), the upper clamping body (102) and the lower clamping body (103) is divided into two symmetrical parts with respect to an axial plane where a diameter of the housing (101), the upper clamping body (102) and the lower clamping body (103) is located; the adjacent ends of the two symmetrical parts of the upper clamping body (102) are connected by a hinge (104); the other adjacent ends of the two symmetrical parts of the upper clamping body (102) are detachably connected by a connecting end plate (105); the adjacent ends of the two symmetrical parts of the lower clamping body (103) are connected by a hinge (104); the other adjacent ends of the two symmetrical parts of the lower clamping body (103) are detachably connected by a connecting end plate (105); the two ends of the housing (101) are open; a top of the housing (101) is fixed to a top fixed ring plate (106); a bottom end of the housing (101) is fixed to a bottom limit ring plate (107); a ring top plate (10201) of the upper clamping body (102) is fixedly mounted on the top fixed ring plate (106); the lower clamping body (103) is sleeved between the upper clamping body (102) and the bottom limit ring plate (107) inside the housing (101); the lower clamping body (103) can axially move up and down inside the housing (101); the upper clamping body (102) comprises the ring top plate (10201), an inner ring wall (10202) and an outer ring wall (10203) arranged coaxially; the top ends of the inner ring wall (10202) and the outer ring wall (10203) are fixed to the ring top plate

(10201); a clamping cavity (10204) with an open bottom is provided between the inner 101876 ring wall (10202) and the outer ring wall (10203); an upper pier channel (10205) is formed between the ring top plate (10201) and a center of the inner ring wall (10202);

| a plurality of clamping support body mounting holes (10206) are symmetrically formed on the inner ring wall (10202); a clamping support body (10207) is mounted in each clamping support body mounting hole (10206); the clamping support body (10207) comprises a radial push rod (1020701) matched with the clamping support body mounting hole (10206); one end of the radial push rod (1020701) extending into the upper pier channel (10205) is provided with a clamping push head (1020702) matched with the bridge pier; the other end of the radial push rod (1020701) located in the clamping cavity (10204) is provided with an upper slope (10208);

the clamping cavity (10204) is provided with a plurality of clamping electromagnets (10209) fixed on the bottom surface of the ring top plate (10201);

a plurality of mounting holes (10210) are symmetrically formed on the ring top plate (10201);

the lower clamping body (103) comprises a ring bottom plate (10301); a lower pier channel (10302) is formed in the center of the ring bottom plate (10301); the lower pier channel (10302) and the upper pier channel (10205) are coaxially arranged and have the same inner diameter;

a plurality of wedge-shaped push heads (10303) matched with the clamping support body are symmetrically arranged on the top surface of the ring bottom plate (10301); the wedge-shaped push head (10303) is provided with a lower slope (10304) matched with the upper slope;

a plurality of clamping iron blocks (10305) matched with the clamping electromagnet (10209) are symmetrically arranged on the top surface of the ring bottom plate (10301); the clamping electromagnet (10209) magnetically attracts the clamping iron block (10305), so that the lower clamping body (102) moves axially upward, and the wedge-shaped push head (10303) pushes the clamping support body (10207) to

"7 mmm EEE move radially inwards, so as to clamp the bridge pier; lu101876 a plurality of spring through holes (10306) arranged coaxially with the mounting holes (10210) are symmetrically formed on the top surface of the ring bottom plate | (10301); the traction mechanism (3) comprises a traction shaft (301) mounted in the mounting hole (10210) of the upper clamping mechanism (1); a rope through hole (302) is formed in the traction shaft (301) along the axial direction; a traction electromagnet (303) is mounted on the portion of the traction shaft (301) extending from and adjacent to the ring top plate (10201) of the upper clamping mechanism (1); a traction iron block (304) is sleeved on the traction shaft (301) and can move along the traction shaft (301); the end of the traction shaft (301) extending into the clamping cavity (10204) is fixed to one end of an axial reset spring (305); the other end of the axial reset spring (305) passes through the spring through hole (10306) of the upper clamping mechanism (1) and is fixed to the mounting hole (10210) on the ring top plate (10201) of the lower clamping mechanism (2); one end of the traction rope (306) is fixedly mounted on the traction iron block (304); the other end of the traction rope (306) passes through the rope through hole (302) and the axial reset spring (305), and is fixed on the mounting hole (10210) of the ring top plate (10201) of the lower clamping mechanism (2); the traction electromagnet (10209) magnetically attracts the traction iron block (304); the traction iron block (304) pulls the traction rope (306) so that the lower clamping mechanism (2) moves axially relative to the upper clamping mechanism (1); and the bridge pier testing sensor (4) is mounted in the upper pier channel (10205).

2. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, the inner wall of the housing (101) is provided with a guide groove (108) along the axial direction; the side wall of the lower clamping body (103) is provided with a guide rail (109) engaged with the guide groove (108).

EEE lu101876

3. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, a reset spring (10211) is mounted between the radial push rod (1020701) and the inner ring wall (10202).

4. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, a rubber layer (1020703) is arranged on the clamping push head (1020702).

5. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, the radial push rod (1020701) comprises a mounting section (102070101) and a telescopic section (102070102); the telescopic section (102070102) is arranged in the mounting section (102070101) and is locked by a fastening bolt (102070103), so that the length of the radial push rod (1020701) can be adjusted; the telescopic section (102070102) is connected to the clamping push head (1020702).

6. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, a rope receiving groove (307) is formed at the end of the traction shaft (301) extending from the ring top plate (10201) of the upper clamping mechanism (1).

7. The bridge pier testing device based on the electromagnetic spring technique according to claim 1, characterized in that, the traction iron block comprises an inner iron block (30401) and an outer iron block (30402); a sliding channel (30403) matched with the traction shaft (301) is formed in the center of the inner iron block (30401); the end of the inner iron block (30401) away from the traction electromagnet (303) is provided with a limit flange (30404); the outer iron block (30402) is sleeved on the

EES inner iron block (30401) and is limited by the limit flange (30404); the height of the ~~ “101878 inner iron block (30401) is greater than the height of the outer iron block (30402).

8. The bridge pier testing device based on the electromagnetic spring technique according to claim 7, characterized in that, the traction iron block (304) has a multi- stage structure; another outer iron block is also sleeved on the outer iron block (30402) and is limited by a limit flange; the height of the multi-stage outer iron block is gradually reduced from inside to outside; the traction rope (306) is fixed in a traction rope mounting hole (308) of the outermost outer iron block. i a