CN118225590A - Cement concrete pavement strength testing device - Google Patents

Abstract

The invention discloses a cement concrete pavement strength testing device, which relates to the technical field of road construction and comprises a base and concrete test blocks, wherein support rods I are fixedly arranged on two sides of the base, a pressing part is arranged at the top of the base, a pressing point adjusting part is arranged at the top of the pressing part, a limiting plate is fixedly arranged at the top of the support rods I, support rods II are fixedly arranged on two sides of the limiting plate, and clamping parts are arranged on the inner sides of the support rods II. The advantages are that: the position of the pressing point is confirmed without manually measuring marks on the concrete test block, the two supporting vertical plates can be combined to form a pressing point, the two pressing points and the pressing point are conveniently switched, the two sides of the concrete test block can be clamped, the position of the concrete test block is fixed rapidly, and the influence of gravity on test data of the concrete test block can be avoided.

Description

A cement concrete pavement strength testing device

Technical Field

The invention relates to the technical field of road construction, and in particular to a cement concrete pavement strength testing device.

Background technique

The position of the pressure point in the concrete flexural test has an important influence on the test results. The selection of the pressure point directly affects the response and stress distribution of the specimen, which in turn affects the measured flexural strength. Therefore, when conducting a concrete flexural test, it is necessary to reasonably select the position of the pressure point based on the size, shape and performance characteristics of the specimen to be tested to ensure the accuracy of the test results.

In the existing measurement method, the position of the pressure point is usually obtained by manual measurement, and the distance between the two pressure points and the two ends of the test block needs to be equal. After the measurement is completed, it is marked with a marker, and then the pressure-applying device is aligned with the mark to start the test. Due to manual measurement and manual alignment, this method is prone to errors in the position of the pressure points, resulting in inaccurate test results. Therefore, a new type of cement concrete pavement strength testing device can be used to solve the shortcomings of the existing technology.

Summary of the invention

The purpose of the present invention is to solve the problems existing in the prior art and to propose a cement concrete pavement strength testing device.

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

A cement concrete pavement strength testing device comprises a base and a concrete test block, wherein a first support rod is fixedly installed on both sides of the base, a pressure applying part is provided on the top of the base, a pressure point adjusting part is provided on the top of the pressure applying part, a limit plate is fixedly installed on the top of the first support rod, a second support rod is fixedly installed on both sides of the limit plate, and a clamping part is provided on the inner side of the second support rod;

The pressure point adjustment part includes two support vertical plates attached to the bottom of the concrete test block, and the interiors of the two support vertical plates are provided with splicing components, and racks are fixedly installed on one side of the two support vertical plates, and the two racks are arranged horizontally, and the sides of the two racks close to each other are meshed with gears, and the bottom ends of the gears are rotatably installed with the support plates, and one side of one of the racks is fixedly installed with an electric telescopic rod 1, and the electric telescopic rod 1 is slidably plugged and installed with the support plate, and the outer wall of the electric telescopic rod 1 is fixedly installed with a bracket, and a sliding block is fixedly installed on one side of the bracket, and the sliding block is slidably installed with the support rod 2;

The splicing component includes two movable plates, the two movable plates are slidably mounted on the tops of the two supporting vertical plates respectively, the two movable plates are arranged opposite to each other, a plurality of arc-shaped telescopic rods are fixedly mounted on one side of the two movable plates, the outer walls of the plurality of arc-shaped telescopic rods are sleeved with arc-shaped springs, and both ends of the plurality of arc-shaped springs are fixedly mounted on the movable plate and the supporting vertical plate respectively;

The clamping part includes a top plate, which is fixedly installed on the inner side of the top end of the second support rod, a linkage component is provided inside the top plate, a power component is provided on the top of the top plate, a cavity is opened in the top plate, a rectangular hole connected to the cavity is opened at the bottom of the top plate, and cross holes connected to the cavity are opened on both sides of the top plate, two sliding plates are slidably installed in the rectangular hole of the top plate, and support plates are fixedly installed at the bottom of the two sliding plates, and the bottoms of the two support plates are both fitted with the concrete test block, one of the support plates is fixedly installed with support blocks on both sides, and the other support plate is fixedly installed with a first clamping plate on one side, and a locking component is fixedly installed on one side of the support block, a rotating shaft is rotatably installed inside the support block, and a second clamping plate is fixedly installed on the outer wall of the rotating shaft, and the first clamping plate and the second clamping plate are respectively fitted on both sides of the concrete test block.

In the above-mentioned cement concrete pavement strength testing device, the sliding block is T-shaped, a T-shaped sliding groove is provided in the second support rod, and the sliding block is slidably installed with the second support rod through the T-shaped sliding groove.

In the above-mentioned cement concrete pavement strength testing device, the power component includes a protective frame, which is fixedly installed on the top of the top plate, and a mounting frame is fixedly installed on the top of the top plate and at the bottom of the protective frame, and an electric telescopic rod 2 is fixedly installed on the top of the mounting frame.

In the above-mentioned cement concrete pavement strength testing device, the linkage component includes two limit frames, which are respectively fixedly installed on the two ends of the electric telescopic rod, and the bottom ends of the two limit frames are rotatably installed with rotating rods. The rotating rods are located in the cavity of the top plate and are slidably installed with the top plate through the cross hole of the top plate. One end of the two rotating rods is respectively hinged to the two sliding plates.

In the above-mentioned cement concrete pavement strength testing device, the locking component includes a ratchet, which is fixedly mounted on one side of the support block, and the outer wall of the ratchet is engaged with an insertion rod, and a sliding column is fixedly mounted on one side of the insertion rod, and the sliding column is slidably plug-in mounted on the rotating shaft, and a straight spring is fixedly mounted on one side of the sliding column, and the other side of the straight spring is fixedly mounted on the inner wall of the rotating shaft.

In the above-mentioned cement concrete pavement strength testing device, a spline shaft is fixedly mounted on the outer wall of the sliding column, a spline groove is provided in the rotating shaft, and the spline shaft is slidably mounted with the rotating shaft through the spline groove.

In the above-mentioned cement concrete pavement strength testing device, the pressure-applying part includes a hydraulic cylinder, which is fixedly installed on the top of the base, a push plate is fixedly installed on the top of the hydraulic cylinder, a push rod is fixedly installed in the middle of the top of the push plate, and two limit sliding bars are fixedly installed on the top of the push plate. The two limit sliding bars and the top are fixedly installed on the support plate, and the push rod is fixedly installed on the bottom of the support plate.

In the above-mentioned cement concrete pavement strength testing device, a rectangular hole and two circular holes are opened in the limit plate, the limit plate is slidably installed with the push rod through the rectangular hole, and the limit plate is slidably installed with the two limit sliding rods through the two circular holes.

Compared with the prior art, the present invention has the following advantages:

1: The positions of the two support plates can be adjusted simultaneously by driving the electric telescopic rod, and the distances between the two support plates and the two ends of the concrete test block are always the same. There is no need to manually measure marks on the concrete test block to confirm the pressure point position. The two support plates can also be merged into one pressure point, which is convenient for switching between two pressure points and one pressure point.

2: Clamping both sides of the concrete test block while moving it upward can quickly fix the position of the concrete test block. At the same time, a locking component is provided to adjust the angle of the second clamping plate so that the concrete test block can be placed between the first and second clamping plates. The right angle of the first clamping plate is fitted at a right angle to the side of the concrete test block, and then clamping is performed to keep the concrete test block level.

3: In the existing concrete strength test, a pressure point is used to press down on the concrete test block placed on the two protrusions. At this time, the pressure on the concrete test block is the pressure plus the weight of the concrete test block itself. The concrete test block is pushed upward to make it buckle against the support plate. The upward push is used to perform the concrete test block strength test, which can avoid the concrete test block's own weight interfering with the test results.

To summarize, the present invention is driven by an electric telescopic rod, and the positions of the two supporting uprights can be adjusted simultaneously. The distances between the two supporting uprights and the two ends of the concrete test block are always the same, and there is no need to manually measure marks on the concrete test block to confirm the pressure point position. The two supporting uprights can also be merged into one pressure point, which is convenient for switching between two pressure points and one pressure point. The two sides of the concrete test block can be clamped, and the position of the concrete test block can be quickly fixed, which can prevent gravity from affecting the test data of the concrete test block.

BRIEF DESCRIPTION OF THE DRAWINGS

The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

FIG1 is a schematic structural diagram of a cement concrete pavement strength testing device proposed by the present invention;

FIG2 is a schematic diagram of the split structure of FIG1 ;

FIG3 is a schematic diagram of the structure of FIG1 without the clamping portion;

FIG4 is a schematic diagram of the structure of the pressure point adjustment unit;

FIG5 is a schematic diagram of the top view of the structure of FIG4;

Figure 6 is a schematic diagram of the supporting vertical plate structure;

Fig. 7 is a schematic diagram of the structure of the clamping part;

FIG8 is a schematic diagram of the structure after FIG7 is flipped;

Figure 9 is a schematic diagram of the top plate structure;

FIG10 is a schematic diagram of the structure of FIG7 with the top plate removed;

FIG11 is a schematic diagram of the electric push rod structure;

FIG12 is a schematic diagram of the structure of FIG10 without the rotating rod, the limiting frame, and the electric push rod;

FIG13 is a schematic diagram of the locking member structure;

FIG. 14 is a schematic diagram of the disassembled structure of the locking component.

In the figure: 1 base, 2 hydraulic cylinder, 3 push plate, 4 limit slide rod, 5 push rod, 6 support plate, 7 concrete test block, 8 limit plate, 9 top plate, 10 support rod 1, 11 support rod 2, 12 bracket, 13 electric telescopic rod 1, 14 support vertical plate, 15 sliding block, 16 rack, 17 gear, 18 movable plate, 19 arc telescopic rod, 20 arc spring, 21 electric telescopic rod 2, 22 splint 1, 23 support plate, 24 splint 2, 25 protective frame, 26 limit frame, 27 sliding plate, 28 rotating rod, 29 mounting frame, 30 support block, 31 rotating shaft, 32 ratchet, 33 plug rod, 34 sliding column.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Referring to Figures 1 to 3, a cement concrete pavement strength testing device comprises a base 1, a concrete test block 7, and a support rod 10. The support rod 10 is fixedly installed on both sides of the base 1. A hydraulic cylinder 2 is fixedly installed on the top of the base 1. The hydraulic cylinder 2 is a power source for pushing the concrete test block 7 to move upward and testing the strength of the concrete test block 7. A push plate 3 is fixedly installed on the top of the hydraulic cylinder 2. Limiting slide bars 4 are fixedly installed on both sides of the top of the push plate 3. A push rod 5 is fixedly installed in the middle of the top of the push plate 3. A limiting plate 8 is fixedly installed on the inner side of the top of the support rod 10. A rectangular hole and a circular hole are opened in the limiting plate 8. The limiting plate 8 is slidably installed with the push rod 5 through the rectangular hole. The limiting plate 8 is slidably installed with the limiting slide bar 4 through the circular hole. The limiting plate 8 plays a guiding role through the sliding cooperation of the limiting slide bar 4, the push rod 5 and the limiting plate 8. A support plate 6 is installed on the push rod 5 and the limiting plate 8.

The hydraulic cylinder 2 is started, pushing the push plate 3, the limit slide rod 4, and the push rod 5 to push the support plate 6 to move upward. The support plate 6 is placed with a concrete test block 7 through the support vertical plate 14. The concrete test block 7 on the support vertical plate 14 is pushed by the power of the hydraulic cylinder 2 to be buckled against the bottom of the support plate 23 to complete the test. The upward moving test can avoid errors in the test results caused by the gravity of the concrete test block 7 itself.

Referring to Figures 3 to 5, a sliding groove is provided in the support plate 6, and the support plate 6 is slidably installed with the two support vertical plates 14 through the sliding groove. A rack 16 is fixedly installed on the side close to the two support vertical plates 14. The two racks 16 are horizontally arranged. The two racks 16 are slidably installed with the support plate 6 through a sliding sleeve. The outer walls of the two racks 16 are meshed with a gear 17, and the gear 17 is rotatably installed on one side of the support plate 6. One end of one of the racks 16 is fixedly installed with the protruding end of the electric telescopic rod 13. The electric telescopic rod 13 drives one of the racks 16 to move in the sliding sleeve, and drives the other rack 16 to move through the gear 17, thereby controlling the two support vertical plates 14 to move closer to and away from each other, and the electric telescopic rod 13 The protruding end is slidably connected with the support plate 6, and a bracket 12 is fixedly installed on the outer wall of the electric telescopic rod 13. A sliding block 15 is fixedly installed on one side of the bracket 12. The shape of the sliding block 15 is specifically set to be T-shaped (the T-shape is not drawn in the figure), and support rods 11 are fixedly installed on both sides of the limit plate 8. A T-shaped slide groove matching the sliding block 15 is opened in the support rod 11. The T-shaped slide groove of the support rod 11 is slidably installed with the sliding block 15. The sliding block 15 cooperates with the support rod 11 to provide a limit for the electric telescopic rod 13 to prevent the protruding end of the electric telescopic rod 13 from pushing the body to move backward. Due to the T-shaped setting of the sliding block 15, the bracket 12 can always remain horizontal, and the concrete test block 7 is placed on the top of the supporting vertical plate 14.

The rack 16 is controlled to slide in the support plate 6 by an electric telescopic rod 13, thereby controlling the movement of the support vertical plate 14. The two racks 16 are made to slide simultaneously by a gear 17, thereby controlling the two support vertical plates 14 to move away from or close to each other. No manual measurement and adjustment is required, and at the same time, the distance between the pressure point of the device and the concrete test block 7 on both sides can be kept equal.

Referring to Figure 6, relative movable plates 18 are slidably installed on the top of the two supporting vertical plates 14, and an arc-shaped telescopic rod 19 is fixedly installed on one side of the two movable plates 18. The other end of the arc-shaped telescopic rod 19 is fixedly installed on the supporting vertical plate 14, and the outer wall of the arc-shaped telescopic rod 19 is sleeved with an arc-shaped spring 20, and the two ends of the arc-shaped spring 20 are fixedly installed on the movable plate 18 and the supporting vertical plate 14 respectively.

When the two support plates 14 are close to each other, the arc-shaped telescopic rod 19 contracts, so that the two support plates 14 are combined into a pressure point with an arc on the top, which can realize switching between two pressure points and one pressure point, thereby adapting to two different test modes.

With reference to Fig. 1, Fig. 2 and Fig. 7-12, a top plate 9 is fixedly installed on the inner side of the top of the support rod 11, a protective frame 25 is fixedly installed on the top of the top plate 9, a mounting frame 29 is fixedly installed on the top of the top plate 9 and at the bottom of the protective frame 25, an electric telescopic rod 21 is fixedly installed on the top of the mounting frame 29, the electric telescopic rod 21 is a two-way push rod that can be telescoped to both sides, both ends of the electric telescopic rod 21 are fixedly installed with limit frames 26, and a rotating rod 28 is rotatably installed at the bottom of the two limit frames 26. The limit frames 26 and the rotating rod 28 are driven by connecting rods. Compared with the traditional clamping structure using gears, racks and the like, it has the characteristic of being able to withstand greater pressure, so that the electric telescopic rod 21 can output greater power to the limit frames 26 and the rotating rod 28, so as to drive the clamping plate 24 to clamp the concrete test block 7 with greater force, thereby increasing the stability of the concrete test block 7, and the other ends of the two rotating rods 28 are hinged with sliding plates 27, and the bottoms of the two sliding plates 27 A support plate 23 is fixedly installed on the top, and support blocks 30 are fixedly installed on both sides of one of the support plates 23, and a clamping plate 22 is fixedly installed on one side of the other support plate 23. A rotating shaft 31 is rotatably installed in the support block 30, and a clamping plate 24 is fixedly installed on the outer wall of the rotating shaft 31. A cavity is opened inside the top plate 9, and a rectangular hole connected to the cavity is opened at the bottom of the top plate 9, and a cross hole connected to the cavity is opened on the side of the top plate 9. The sliding plate 27 is slidably installed with the top plate 9 through the rectangular hole, and the top plate 9 is located between the sliding plate 27 and the support plate 23 (see Figure 8 for details). The cross-shaped design of the sliding plate 27 can limit the sliding plate 27 from moving downward due to gravity. The rotating rod 28 is located in the cavity of the top plate 9, and the rotating rod 28 is slidably installed with the top plate 9 through the cross hole, and can partially protrude to the outside of the top plate 9 through the cross hole (see Figure 8 for details). The two rotating rods 28 are both inclinedly arranged in the top plate 9, and the two rotating rods 28 are horizontally arranged.

The cam 33 is provided with a plurality of cams 34, each of which is provided with a plurality of cams 34a and 34b, and the cam 33a is provided with a plurality of cams 34b.

When the concrete test block 7 is clamped, the two limit frames 26 are driven to move by the electric telescopic rod 21, and the rotating rod 28 is driven to change its angle, so that the rotating rod 28 pulls back the sliding plate 27, and at the same time pulls back the supporting block 30 and the second clamping plate 24 on the sliding plate 27, so that the second clamping plate 24 clamps both sides of the concrete test block 7, and the second clamping plate 24 fits with the side of the concrete test block 7 to prevent the concrete test block 7 from slipping during the test.

Before placing the concrete test block 7, the position of the second clamp plate 24 will block the placement of the concrete test block 7. At this time, the sliding column 34 is pulled out from the shaft 31 by pulling the insertion rod 33, so that the clamping column of the insertion rod 33 is disengaged from the ratchet 32, and the shaft 31 can be rotated. The rotation of the shaft 31 drives the second clamp plate 24 to rotate. After the second clamp plate 24 is rotated to make the second clamp plate 24 horizontal, the insertion rod 33 is loosened so that the straight spring drives the insertion rod 33 to rebound, and the clamping column of the insertion rod 33 is re-stuck between the ratchet teeth of the ratchet 32, thereby completing the rotation restriction of the second clamp plate 24. The second clamp plate 24 is horizontal to facilitate the placement of the concrete test block 7.

The specific operation steps of this device are as follows:

First, adjust the pressure point, and formulate a suitable test according to the qualified standards of concrete pavement. When the pressure point is in place, it is only necessary to drive the rack 16 forward through the electric telescopic rod 13 to drive the gear 17 to rotate, thereby driving the other rack 16 to move, and driving the support vertical plates 14 to gather together. After the support vertical plates 14 reach the appropriate position, the subsequent test can be started, or the two support vertical plates 14 can be gathered together to carry out a single pressure point test. After the two support vertical plates 14 are in place, the movable plate 18 retracts into the support vertical plate 14 and compresses the arc-shaped telescopic rod 19 and the arc-shaped spring 20.

The locking member on the second clamping plate 24 is then operated to pull out the insertion rod 33 so that the clamping column of the insertion rod 33 is disengaged from the ratchet teeth of the ratchet wheel 32. In this process, the straight spring will be stretched. After the clamping column is disengaged from the ratchet wheel 32, the shaft 31 can be rotated. By rotating the insertion rod 33, the spline groove on the sliding column 34 and the spline shaft in the shaft 31 are used to drive the shaft 31 to rotate (not shown in the figure). The rotation of the shaft 31 drives the second clamping plate 24 to rotate. After the second clamping plate 24 is level with the ground, the insertion rod 33 can be released, so that the straight spring drives the insertion rod 33 to rebound, and the clamping column of the insertion rod 33 is re-engaged between the ratchet teeth of the ratchet wheel 32. After the second clamping plate 24 is level, the concrete test block 7 can be conveniently placed from the side between the top of the supporting vertical plate 14 and the second clamping plate 24 and the first clamping plate 22.

After the concrete test block 7 is placed, the electric telescopic rod 21 is started to drive the limit frame 26 to expand outward, and then the rotating rod 28 is used to drive the sliding plate 27 to slide on the bottom wall of the mounting frame 29 and gather together, and at the same time, the second clamp 24 and the first clamp 22 are driven to approach each other. After the first clamp 22 and the second clamp 24 are attached to the two sides of the concrete test block 7, the fit between the concrete test block 7 and the second clamp 24 is observed, and the insertion rod 33 is pulled out again to adjust the angle of the second clamp 24 to ensure that its side is in contact with the concrete test block 7. The concrete test block 7 is quickly flattened by clamping the second clamp 24 and the first clamp 22, and the position of the concrete test block 7 is stabilized. The top of the concrete test block 7 is in contact with the support plate 23 to provide a top pressure point.

After the concrete test block 7 is clamped and laid flat, the hydraulic cylinder 2 can be started to drive the push plate 3, the limit slide rod 4, and the push rod 5 to push the support plate 6 to move upward, and the concrete test block 7 placed on the top of the support vertical plate 14 moves upward accordingly. After the top of the concrete test block 7 is fastened to the support plate 23, the test begins. At this time, the electric telescopic rod 21 is slightly retracted, so that the clamping plate 1 22 and the clamping plate 24 are separated from the two sides of the concrete test block 7, but the position is very close to the concrete test block 7, so as to avoid the friction of the clamping plate 1 22 and the clamping plate 24 affecting the test results. At the same time, the position of the concrete test block 7 can be protected during the test. The two support plates 23 and the two support vertical plates 14 are used as force application points to apply pressure to the concrete test block 7. When the force applied by the hydraulic cylinder 2 reaches the force of the pressure-bearing qualified standard, observe whether the concrete test block 7 has cracks or damage. If not, it is qualified.

When conducting a single pressure point test, the first and second clamps 22 and 24 must not be allowed to completely loosen the concrete test block 7. Clamps 1 22 and 24 must be kept in contact with each other to ensure that the concrete test block 7 remains balanced during the bottom single pressure point test. The concrete test block 7 is pushed to move on the inner side of clamps 1 22 and 24 by the hydraulic cylinder 2, so that the concrete test block 7 is completely buckled against the support plate 23. The hydraulic cylinder 2 is also used to continuously apply force. When the force reaches the pressure-bearing qualified standard, observe whether the concrete test block 7 has cracks or damage.

The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (8)

1. The cement concrete pavement strength testing device comprises a base (1) and a concrete test block (7), and is characterized in that support rods I (10) are fixedly arranged on two sides of the base (1), a pressing part is arranged at the top of the base (1), a pressing point adjusting part is arranged at the top of the pressing part, a limiting plate (8) is fixedly arranged at the top of the support rods I (10), support rods II (11) are fixedly arranged on two sides of the limiting plate (8), and clamping parts are arranged on the inner sides of the support rods II (11);

The pressure point adjusting part comprises two support vertical plates (14) attached to the bottom of a concrete test block (7), splicing members are arranged in the two support vertical plates (14), racks (16) are fixedly arranged on one sides of the two support vertical plates (14), the racks (16) are horizontally arranged, gears (17) are meshed with one sides, close to the racks (16), of the racks, the bottom end of each gear (17) is rotatably mounted with a support plate (6), one side of each rack (16) is fixedly provided with a first electric telescopic rod (13), the first electric telescopic rod (13) is slidably inserted and mounted with the support plate (6), a support (12) is fixedly mounted on the outer wall of the first electric telescopic rod (13), a sliding block (15) is fixedly mounted on one side of the support (12), and the sliding block (15) is slidably mounted with a second support rod (11);

The splicing member comprises two movable plates (18), wherein the two movable plates (18) are respectively and slidably arranged at the top ends of the two supporting vertical plates (14), the two movable plates (18) are oppositely arranged, one sides of the two movable plates (18) are fixedly provided with a plurality of arc-shaped telescopic rods (19), the outer walls of the arc-shaped telescopic rods (19) are sleeved with arc-shaped springs (20), and two ends of each arc-shaped spring (20) are respectively and fixedly arranged on the movable plates (18) and the supporting vertical plates (14);

The utility model provides a concrete test bed, including supporting rod (11) and concrete test bed, the clamping part includes roof (9), roof (9) fixed mounting is inboard in supporting rod two (11) top, roof (9) inside is equipped with the linkage component, roof (9) top is equipped with power component, the cavity has been seted up in roof (9), the rectangular hole that the cavity put through has been seted up to roof (9) bottom, the cross hole that put through with the cavity has been seted up to roof (9) both sides, the rectangular hole slidable mounting of roof (9) has two sliding plates (27), two sliding plate (27) bottom equal fixed mounting has extension board (23), two extension board (23) bottom all is the laminating setting with concrete test bed (7), one of them extension board (23) both sides fixed mounting has supporting shoe (30), another extension board (23) one side fixed mounting has splint one (22), supporting shoe (30) one side fixed mounting has locking component, pivot (31) are installed in the inside rotation of supporting shoe (30), pivot (31) outer wall fixed mounting has two (24), splint (24) two sides are laminated in concrete test bed (7) respectively.

2. The cement concrete pavement strength testing device according to claim 1, wherein the sliding block (15) is of a T shape, a T-shaped sliding groove is formed in the second supporting rod (11), and the sliding block (15) is slidably arranged with the second supporting rod (11) through the T-shaped sliding groove.

3. The cement concrete pavement strength testing device according to claim 2, wherein the power component comprises a protection frame (25), the protection frame (25) is fixedly installed on the top of the top plate (9), a mounting frame (29) is fixedly installed on the top of the top plate (9) and located at the bottom of the protection frame (25), and an electric telescopic rod II (21) is fixedly installed on the top of the mounting frame (29).

4. A cement concrete pavement strength testing device according to claim 3, wherein the linkage member comprises two limiting frames (26), the two limiting frames (26) are respectively and fixedly mounted at two ends of the electric telescopic rod II (21), the bottom ends of the two limiting frames (26) are respectively and rotatably provided with a rotating rod (28), the rotating rod (28) is located in a cavity of the top plate (9) and is in sliding mounting arrangement with the top plate (9) through a cross hole of the top plate (9), and one ends of the two rotating rods (28) are respectively and hingedly mounted with the two sliding plates (27).

5. The cement concrete pavement strength testing device according to claim 4, wherein the locking member comprises a ratchet wheel (32), the ratchet wheel (32) is fixedly installed on one side of the supporting block (30), an inserting rod (33) is clamped on the outer wall of the ratchet wheel (32), a sliding column (34) is fixedly installed on one side of the inserting rod (33), the sliding column (34) and the rotating shaft (31) are installed in a sliding insertion mode, a straight barrel spring is fixedly installed on one side of the sliding column (34), and the other side of the straight barrel spring is fixedly installed on the inner wall of the rotating shaft (31).

6. The cement concrete pavement strength testing device according to claim 5, wherein a spline shaft is fixedly arranged on the outer wall of the sliding column (34), spline grooves are formed in the rotating shaft (31), and the spline shaft is slidably arranged with the rotating shaft (31) through the spline grooves.

7. The cement concrete pavement strength testing device according to claim 1, wherein the pressing part comprises a hydraulic cylinder (2), the hydraulic cylinder (2) is fixedly installed at the top of the base (1), a pushing disc (3) is fixedly installed at the top of the hydraulic cylinder (2), a push rod (5) is fixedly installed in the middle of the top of the pushing disc (3), two limit sliding rods (4) are fixedly installed at the top of the pushing disc (3), and the two limit sliding rods (4) and the top are fixedly installed with a supporting plate (6), and the push rod (5) is fixedly installed at the bottom of the supporting plate (6).

8. The cement concrete pavement strength testing device according to claim 7, wherein a rectangular hole and two round holes are formed in the limiting plate (8), the limiting plate (8) is slidably mounted with the push rod (5) through the rectangular hole, and the limiting plate (8) is slidably mounted with the two limiting slide rods (4) through the two round holes.