Nondestructive testing device for compactness of collapsible loess roadbed

Abstract

The utility model relates to a collapsible loess roadbed compactness nondestructive testing device which comprises a supporting block, four air cavities are formed in the supporting block, a first through hole is formed in the lower end face of each air cavity, a first piston rod is arranged in each first through hole, and the lower end of each first piston rod is connected with a bearing plate through a ball corner. Four second through holes evenly distributed along the circumference are formed in the periphery of each first through hole, a second piston rod is arranged in each second through hole, a disc is arranged on the lower end face of each air cavity, a vertical hole is formed in the middle of each disc, and eight vertical holes penetrating through the upper end face and the lower end face are formed in each disc; according to the drop hammer deflectometer, a bearing plate of an existing drop hammer deflectometer is improved, so that after the bearing plate hammers the ground for the first time, all the second piston rods can downwards extend out and abut against the bearing plate under the action of air pressure, the supporting strength of the bearing plate is greatly improved, the stress of the universal joint structure is reduced, and the service life of the universal joint structure is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to road construction field, concretely is collapsible loess roadbed compactness nondestructive testing device. BACKGROUND

[0002] When the collapsible loess roadbed is detected, in order to not destroy the road surface, two methods of drop hammer type deflectometer and Rayleigh wave are mostly used to realize the nondestructive rapid detection of the collapsible loess compaction quality, wherein the drop hammer type deflectometer is most widely used, the full-automatic drop hammer type deflectometer disclosed in the prior art with the announcement number CN201152841Y greatly improves the compaction degree detection efficiency through the full-automatic drop hammer and measurement, and realizes the automatic leveling through the bottom load-bearing plate that can be automatically adjusted, but the metal plate of the scheme is connected with the transition plate through the universal joint, the impact force is borne by the universal joint in the drop hammer process, the supporting strength of the universal joint is limited, and the impact load is too large, which seriously affects the connecting strength and rotating reliability of the universal joint, and the connecting structure needs to be replaced regularly. CONTENT OF UTILITY MODEL

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model adopts the collapsible loess roadbed compactness nondestructive testing device, and solves the problem of stress concentration of the connecting structure of the existing drop hammer type deflectometer.

[0004] The technical scheme solved is that the collapsible loess roadbed compactness nondestructive testing device comprises a supporting block, four gas cavities are arranged inside the supporting block in front, back, left and right, a first through hole penetrating the lower end face of the supporting block is arranged on the lower end face of each gas cavity, a first piston rod capable of sliding up and down is arranged in each first through hole, the lower end face of each first piston rod extends out of the first through hole and is connected with a load-bearing plate through a ball angle, four second through holes uniformly distributed along the circumference are arranged on the periphery of each first through hole, the second through hole penetrates the gas cavity and the lower end face of the supporting block, a second piston rod capable of sliding up and down is arranged in each second through hole, and the lower end of the second piston rod extends out of the second through hole.

[0005] The lower end face of the gas cavity is provided with an annular groove, the disc is located in the annular groove, a driven gear is arranged on the outer edge face of the disc, a gear cavity is arranged in the middle of the supporting block, the gear cavity is in communication with the inner side end of each annular groove, a driving gear is arranged in the gear cavity, the driving gear is meshed with each driven gear through the communication position of the annular groove and the gear cavity, a rotating shaft is arranged in the middle of the driving gear, the lower end of the rotating shaft penetrates the lower end face of the supporting block and is fixedly connected with a handle.

[0006] The first piston rod lower end is provided with a shaft shoulder, and a compression spring is arranged between the shaft shoulder and the supporting block.

[0007] The bearing plate is a fan-shaped plate, and four bearing plates can form a complete circular surface.

[0008] Compared with the prior art, the present application has the following advantages:

[0009] 1. The bearing plate of the existing drop hammer type deflection instrument is improved, the supporting structure is improved to be a piston rod that can move up and down along the air cavity, i.e., a first piston rod, and an auxiliary supporting structure that can share the supporting force of the universal joint is arranged around the original universal joint connecting structure, i.e., a second piston rod, so that after the bearing plate is hit on the ground for the first time, all the second piston rods can extend downward under the action of air pressure and abut against the bearing plate, and then always maintain the supporting effect under the action of the one-way valve, thereby greatly improving the supporting strength of the bearing plate, reducing the stress of the universal joint structure, and prolonging the service life thereof.

[0010] 2. The rotation of the disc drives different vertical holes to communicate with the second through hole, so that the second piston rod is always affected by the one-way valve and cannot be reset during detection operation, and can be quickly reset after detection is completed, so that the device can be quickly applied to different inclination road surfaces and can be reused, thereby greatly improving the practicality. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a front view of the present application.

[0012] Figure 2 It is a front view of the present application.

[0013] Figure 3 It is a top view of the bearing plate of the present application.

[0014] Figure 4 It is a bottom view of the supporting block of the present application.

[0015] Figure 5 It is a top view of the disc and the driving gear of the present application. DETAILED DESCRIPTION

[0016] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0017] By Figures 1 to 5The utility model provides a kind of support block, support block 1 inside is equipped with four air cavities 2 before and after left and right, the lower end surface of each air cavity 2 is equipped with a first through-hole 3 penetrating support block 1 lower end surface, each first through-hole 3 is equipped with a first piston rod 4 that can slide up and down, the lower end surface of each first piston rod 4 extends first through-hole 3 and is connected with load plate 5 by ball angle;The periphery of each first through-hole 3 is equipped with four second through-holes 6 that are evenly distributed along circumference, second through-hole 6 penetrates air cavity 2 and support block 1 lower end surface, each second through-hole 6 is equipped with a second piston rod 7 that can slide up and down respectively, and second piston rod 7 lower end extends second through-hole 6;The lower end surface of each air cavity 2 is provided with a disc 8 that can rotate around axis respectively, and the lower end surface of disc 8 is attached with air cavity 2 lower end surface and middle part is equipped with the vertical hole 10 corresponding with first through-hole 3, disc 8 is equipped with eight vertical holes 10 penetrating upper and lower end surfaces, and all vertical holes 10 are evenly distributed along circumference, and four non-adjacent vertical holes 10 on each disc 8 are provided with check valve, and check valve makes gas only pass through vertical hole 10 from top to bottom.

[0018] The lower end surface of air cavity 2 is equipped with annular groove 11, disc 8 is in annular groove 11, and disc 8 outer edge surface is provided with driven gear 12, support block 1 middle part is equipped with gear cavity 13, gear cavity 13 is communicated with the inner side end of each annular groove 11 respectively, gear cavity 13 is provided with driving gear 14, and driving gear 14 is engaged with each driven gear 12 through the communication position of annular groove 11 and gear cavity 13 respectively, and driving gear 14 middle part is provided with rotating shaft 15, and rotating shaft 15 lower end penetrates support block 1 lower end surface and is fixedly connected with handle 16.

[0019] The lower end of the first piston rod 4 is provided with a shaft shoulder 17, and a compression spring is arranged between the shaft shoulder 17 and the support block 1.

[0020] The load plate 5 is a fan-shaped plate, and the four load plates 5 can form a complete circular surface on the ground.

[0021] The device is used to replace the bearing plate of the existing drop hammer type deflection meter, and the support block 1 is fixedly connected with the weight. When the weight falls, the bearing plate 5 impacts the ground. In use, first, the drop hammer type deflection meter is placed at a detection position, so that all the second piston rods 7 are located at the uppermost end and are arranged in a spaced manner with the bearing plate 5, all the second through holes 6 correspond to the vertical holes 10 containing the one-way valves, then the weight is dropped, when the weight is dropped for the first time, the bearing plate 5 first contacts the ground and makes all the bearing plates 5 adhere to the ground through the rotation of the ball corners, then the bearing plate 5 drives the first piston rod 4 to move upward along the first through hole 3, so that the gas in the air cavity 2 is compressed, the gas enters the second through hole 6 through the vertical hole 10 and pushes all the second piston rods 7 to move downward synchronously until all the second piston rods 7 contact the upper end surface of the bearing plate 5, at this time, the second piston rod 7 can share the support force of the ball corner on the bearing plate 5, because the one-way valve in the vertical hole 10 limits the gas in the second through hole 6 from flowing back, all the second piston rods 7 can always provide the support force on the bearing plate 5, then the ground is impacted through the mode of lifting and dropping the weight, and the ground vibration data is measured and recorded through the sensor, and every time the weight is dropped, the second piston rod 7 can share the support force of the first piston rod 4 on the bearing plate 5, so that the service life of the ball corner is greatly improved.

[0022] After the road surface detection work is completed, the operator can manually rotate the handle 16 at the lower side of the device, so that the rotating shaft 15 drives all the discs 8 to rotate through the driving gear 13 and the driven gear 12 until all the vertical holes 10 without the one-way valves are communicated with the second through holes 6, the first piston rod 4 can be reset downward under the elastic force of the compression spring, so that the air cavity 2 is negative pressure, all the second piston rods 7 can be reset upward and downward to the uppermost end along the second through hole 6, the automatic reset of the whole device is completed, and the device is convenient for use at the next detection point.

Claims

1. A non-destructive testing device for the compaction degree of collapsible loess subgrade, comprising a support block (1), characterized in that: The support block (1) is internally provided with four air cavities (2) in front, back, left and right, each air cavity (2) is provided with a first through hole (3) penetrating the lower end surface of the support block (1), each first through hole (3) is provided with a first piston rod (4) capable of sliding up and down, the lower end surface of each first piston rod (4) extends out of the first through hole (3) and is connected with a bearing plate (5) through a ball corner; the periphery of each first through hole (3) is provided with four second through holes (6) uniformly distributed along the circumference, the second through hole (6) penetrates the air cavity (2) and the lower end surface of the support block (1), each second through hole (6) is provided with a second piston rod (7) capable of sliding up and down, the lower end of the second piston rod (7) extends out of the second through hole (6); the lower end surface of each air cavity (2) is provided with a disc (8) capable of rotating around an axis, the lower end surface of the disc (8) is attached to the lower end surface of the air cavity (2) and is provided with a vertical hole (10) corresponding to the first through hole (3) in the middle, the disc (8) is provided with eight vertical holes (10) penetrating the upper and lower end surfaces, all the vertical holes (10) are uniformly distributed along the circumference, four non-adjacent vertical holes (10) on each disc (8) are provided with a one-way valve, the one-way valve allows gas to pass through the vertical hole (10) only from top to bottom.

2. The loess roadbed compaction nondestructive testing device according to claim 1, characterized in that, The lower end surface of the air cavity (2) is provided with an annular groove (11), the disc (8) is located in the annular groove (11), and the outer edge surface of the disc (8) is provided with a driven gear (12), the support block (1) is provided with a gear cavity (13) in the middle, the gear cavity (13) is in communication with the inner side end of each annular groove (11), the gear cavity (13) is provided with a driving gear (14), the driving gear (14) is engaged with each driven gear (12) through the communication position of the annular groove (11) and the gear cavity (13), the driving gear (14) is provided with a rotating shaft (15) in the middle, the rotating shaft (15) penetrates the lower end surface of the support block (1) and is fixedly connected with a handle (16).

3. The device for non-destructive testing of compaction degree of collapsible loess roadbed according to claim 1, characterized in that, The lower end of the first piston rod (4) is provided with a shaft shoulder (17), and the shaft shoulder (17) is provided between the support block (1).

4. The device for non-destructive testing of compaction degree of collapsible loess roadbed according to claim 1, characterized in that, The bearing plate (5) is a fan-shaped plate, and the four bearing plates (5) can form a complete circular surface on the ground.

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