A construction road compressive strength detection device

Abstract

The application relates to the technical field of detection, in particular to a construction road compressive strength detection device which comprises a rack, a sleeve and a sealing mechanism, two pressure heads arranged in an up-down mode are arranged on the top of the rack; the lower pressure head is fixed on a workbench, and the upper pressure head is movably arranged on the rack through a hydraulic cylinder; a core sample is arranged between the two pressure heads; one side of the sleeve close to the pressure head is provided with a pressure column; the pressure column, the sleeve and the core sample form a medium cavity; the medium cavity is filled with liquid pressure transmission medium. When the sealing mechanism is immersed in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column and the sleeve, so that the medium cavity is in a sealed state; air is avoided between the pressure column and the pressure transmission medium, the end surface of the pressure transmission medium is not uneven, the medium is replaced into liquid pressure transmission medium, and uneven pressure on the core sample caused by uneven upper and lower end surfaces of the core sample is prevented.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and specifically to a device for testing the compressive strength of construction roads. Background Technology

[0002] Road surface is a layered structure built on top of the roadbed using various materials, providing a platform for vehicles to travel on. It is a major component of highways, and its quality directly affects driving speed, safety, and transportation costs. The road surface structure generally consists of a surface layer, a base layer, and a subbase layer. The base layer includes materials such as crushed stone, gravel, and stabilized soil. Roadbed materials need to be screened, tested, and processed before being laid on the base layer. Current roadbed and pavement material strength testing systems involve taking core samples using sampling equipment and then performing pressure tests on the core samples to see if they can withstand the corresponding pressure. Since the upper and lower surfaces of the core samples may be uneven or tilted, cutting equipment is needed to cut both ends of the core sample before it is placed on the pressure machine, which is time-consuming and labor-intensive.

[0003] In the prior art, such as the Chinese patent with publication number CN111220466B entitled "A Road Compressive Strength Testing Device and Method," the disclosed technical solution describes that the upper pressure head of the press transmits pressure to the upper end face of the core sample through upper sand, and the lower pressure head of the press transmits pressure to the lower end face of the core sample through lower sand, allowing the core sample to be tested for compressive strength without cutting. However, due to the large flow resistance between sand particles, the flowability of the sand is affected. Furthermore, due to the unevenness of the upper and lower end faces of the core sample, the sand thickness between the pressure head and the end face of the core sample is different, which may lead to differences in the pressure applied by the pressure head to different positions on the end face of the core sample, thus affecting the test results. Summary of the Invention

[0004] This invention provides a device for testing the compressive strength of construction roads to solve the above-mentioned problems.

[0005] The present invention provides a construction road compressive strength testing device, which adopts the following technical solution: a construction road compressive strength testing device, comprising a frame, a sleeve, and a sealing mechanism.

[0006] A worktable is fixed on the frame; two pressure heads are set above the frame, one above the other; the lower pressure head is fixed on the worktable, and the upper pressure head is moved up and down on the frame by a hydraulic cylinder; the core sample is placed between the two pressure heads.

[0007] Two sleeves are provided, one above the other at both ends of the core sample; the sleeve axis is vertically positioned between the core sample and the pressure head; the end of the sleeve closer to the core sample is fitted onto the end of the core sample; the inner wall of the sleeve and the outer wall of the core sample are sealed together with glue; a pressure column is provided on the side of the sleeve closer to the pressure head; the pressure column and the sleeve are coaxial; the end of the pressure column closer to the pressure head is connected to the pressure head through a quick-release structure, and the end closer to the sleeve is inserted into the sleeve.

[0008] The pressure column, sleeve, and core sample form a medium cavity; the medium cavity is filled with a liquid pressure-transmitting medium.

[0009] The sealing mechanism is located between the side wall of the pressure column and the inner wall of the sleeve. After the pressure-transmitting medium is filled into the medium cavity, the hydraulic cylinder drives the pressure head to move the pressure column downward and insert it into the pressure-transmitting medium, squeezing the medium so that it enters the space between the side wall of the pressure column and the inner wall of the sleeve. When the sealing mechanism is submerged in the pressure-transmitting medium, it seals the gap between the pressure column and the sleeve, making the medium cavity sealed. This prevents air from existing between the pressure column and the pressure-transmitting medium, which could cause unevenness on the end face of the pressure-transmitting medium. Furthermore, by replacing the medium with a liquid pressure-transmitting medium, it prevents uneven pressure on the core sample caused by unevenness of the upper and lower end faces. After the pressure-transmitting medium is filled into the medium cavity and the sealing mechanism is submerged in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column and the sleeve. This prevents the pressure applied by the pressure column to the core sample from being concentrated on the peripheral wall of the core sample through the sleeve, thus reducing the influence of the sleeve on the compressive strength test results of the core sample.

[0010] Furthermore, the sealing mechanism includes a sealing sheet and an adjusting device; multiple sealing sheets are provided and distributed along the circumference of the pressure column; the sealing sheet is in the shape of an arc with its center falling on the axis of the pressure column; the sealing sheet is inclined; the end of the sealing sheet near the pressure column is away from the core sample, and the end away from the pressure column is close to the core sample; the sealing sheet is an elastic sheet, and the end near the pressure column is fixedly connected to the pressure column; an exudation gap is provided between the end of the sealing sheet near the pressure column and the inner wall of the sleeve.

[0011] Multiple sealing discs are arranged in a ring. One end of the sealing disc along the circumference of the pressure column presses against the upper surface of the corresponding adjacent sealing disc, and the other end along the circumference of the pressure column presses against the lower surface of the corresponding adjacent sealing disc. Because one end of the sealing disc along the circumference of the pressure column presses against the upper surface of the corresponding adjacent sealing disc, and the other end along the circumference of the pressure column presses against the lower surface of the corresponding adjacent sealing disc, when one of the sealing discs rotates away from the pressure column in a direction away from the core sample, it can drive the adjacent sealing discs to rotate synchronously away from the pressure column in a direction away from the core sample. The adjusting device is used to pull the end of the sealing disc closer to the pressure column in a direction away from the core sample when the sealing disc is immersed in the pressure transmitting medium, so that the leakage gap is reduced until the end of the sealing disc close to the pressure column abuts against and seals the inner wall of the sleeve.

[0012] Furthermore, a rubber layer is fixed to one end of the sealing sheet near the pressure column.

[0013] Furthermore, the adjusting device includes a slide, a mounting hole, and an adjusting structure;

[0014] Multiple grooves are distributed along the circumference of the pressure column; the grooves are opened radially along the pressure column at the end of the pressure column away from the core sample, and are located on the side of the sealing sheet away from the core sample.

[0015] The mounting hole is located at the end of the pressure column away from the core sample and is connected to the sliding groove; the mounting hole and the pressure column are coaxial; a central column is installed inside the mounting hole, moving up and down; a connecting rod is fixed on the central column; the connecting rod is arranged radially along the pressure column, with one end fixedly connected to the pressure column and the other end hinged to the end of the sealing plate near the pressure column; the adjusting structure is used to drive the central column to move away from the core sample through the connecting rod, so as to pull the end of the sealing plate near the pressure column in the direction away from the core sample, so as to reduce the seepage gap until the end of the sealing plate near the pressure column abuts against and seals the inner side wall of the sleeve.

[0016] Furthermore, the adjustment structure includes adjustment teeth and adjustment holes; the adjustment teeth are annular and coaxial with the central column; multiple adjustment teeth are distributed along the axis of the central column; the adjustment teeth are fixed on the peripheral wall of the central column; the adjustment hole is horizontally located on the side wall of the pressure column and is on the same side as the mounting hole; the side wall of the adjustment hole and the mounting hole are connected; an adjustment column is rotatably installed in the adjustment hole; the adjustment column and the adjustment teeth mesh. This drives the adjustment column to rotate, thereby driving the central column to move up and down.

[0017] Furthermore, the adjusting device also includes a drive structure; the drive structure is used to drive the adjusting column to rotate.

[0018] Furthermore, the drive structure includes a drive hole and a drive post; the drive hole is located on the end face of the adjusting post; the drive hole is hexagonal; the drive post is a hexagonal post; the drive post is slidably inserted into the drive hole along the axis of the adjusting post. Rotating the drive post with a wrench or pliers causes the adjusting post to rotate.

[0019] Furthermore, a limiting structure is provided between the pressure column and the drive column; the limiting structure is used to restrict the movement of the central column within the pressure column when the central column is driven away from the core sample so that the sealing plate abuts against and seals one end of the pressure column and the inner wall of the sleeve.

[0020] Furthermore, the defined structure includes a limiting cylinder and a limiting block; the limiting block is fixed to one end of the drive column; the limiting block is cubic in shape; the limiting cylinder is sleeved on the end of the pressure column away from the core sample; the limiting cylinder and the pressure column are fixedly connected; a limiting hole is formed on the side wall of the limiting cylinder; the limiting hole is rectangular; the limiting hole and the adjusting hole are coaxial. By clamping the limiting block with pliers, inserting the drive column into the drive hole, and twisting the limiting block, the adjusting column is driven to rotate, causing the central column to move away from the core sample. When the sealing plate abuts and seals against the inner wall of the sleeve at the end near the pressure column, the limiting block is inserted into the limiting hole with pliers. When it is necessary to rotate the adjusting column again, the limiting block is clamped with pliers and pulled out of the limiting hole, then the limiting block is rotated with pliers.

[0021] Furthermore, the sealing sheet has clearance grooves at both ends along the circumference of the pressure column; one clearance groove is located on the upper end face of the sealing sheet, and the other is located on the lower end face of the sealing sheet. The two clearance grooves on the sealing sheet make adjacent sealing sheets lie on the same plane.

[0022] The beneficial effects of this invention are as follows: After the pressure-transmitting medium is filled into the medium cavity, the hydraulic cylinder drives the pressure head to move the pressure column downward and insert it into the pressure-transmitting medium, and squeezes the pressure-transmitting medium so that it enters between the side wall of the pressure column and the inner side wall of the sleeve. When the sealing mechanism is submerged in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column and the sleeve, so that the medium cavity is in a sealed state. This avoids the presence of air between the pressure column and the pressure-transmitting medium, which would cause unevenness of the end face of the pressure-transmitting medium. Furthermore, by replacing the medium with a liquid pressure-transmitting medium, uneven pressure on the core sample due to unevenness of the upper and lower end faces of the core sample is prevented. After the pressure-transmitting medium is filled into the medium cavity and the sealing mechanism is submerged in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column and the sleeve, preventing the pressure column from sealing the gap between the pressure column and the sleeve before contacting the pressure-transmitting medium. This avoids the pressure applied by the pressure column to the core sample being concentrated on the peripheral wall of the core sample through the sleeve, reducing the influence of the sleeve on the core sample's compressive strength test results. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an embodiment of a road construction compressive strength testing device according to the present invention;

[0025] Figure 2 This is a side view of an embodiment of a construction road compressive strength testing device according to the present invention;

[0026] Figure 3for Figure 2 Sectional view at point AA;

[0027] Figure 4 for Figure 3 Enlarged view of point C in the middle;

[0028] Figure 5 This is a diagram showing the state of the sealing plate sealing the medium cavity in an embodiment of a construction road compressive strength testing device of the present invention;

[0029] Figure 6 for Figure 5 Enlarged view at point D;

[0030] Figure 7 This is a schematic diagram of the sealing mechanism and pressure column of an embodiment of a construction road compressive strength testing device of the present invention;

[0031] Figure 8 This is a side view of the sealing mechanism and pressure column of an embodiment of a construction road compressive strength testing device of the present invention;

[0032] Figure 9 This is a top view of the sealing mechanism and pressure column of an embodiment of a road construction compressive strength testing device according to the present invention;

[0033] Figure 10 for Figure 9 Sectional view at point BB;

[0034] Figure 11 This is an exploded view of the sealing mechanism and pressure column of an embodiment of a construction road compressive strength testing device of the present invention;

[0035] Figure 12 This is a schematic diagram of the drive column and limit block of an embodiment of a road construction compressive strength testing device of the present invention.

[0036] In the diagram: 100, core sample; 200, frame; 210, pressure head; 220, pressure column; 230, medium chamber; 240, sleeve; 250, sealing sheet; 251, rubber layer; 310, slide groove; 320, center column; 330, connecting rod; 341, adjusting tooth; 342, adjusting column; 343, adjusting hole; 351, drive hole; 352, drive column; 361, limiting cylinder; 362, limiting hole; 363, limiting block. Detailed Implementation

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] An embodiment of the compressive strength testing device for construction roads according to the present invention, such as... Figures 1 to 12 As shown, it includes a frame 200, a sleeve 240, and a sealing mechanism.

[0039] A worktable is fixed on the frame 200; two pressure heads 210 are arranged vertically on the top of the frame 200; the lower pressure head 210 is fixed on the worktable, and the upper pressure head 210 is moved vertically on the frame 200 by a hydraulic cylinder; the core sample 100 is placed between the two pressure heads 210.

[0040] Two sleeves 240 are provided, one above the other at both ends of the core sample 100; the axis of the sleeve 240 is vertically positioned between the core sample 100 and the pressure head 210; the end of the sleeve 240 near the core sample 100 is fitted onto the end of the core sample 100; the inner wall of the sleeve 240 and the outer wall of the core sample 100 are sealed together with adhesive; a pressure post 220 is provided on the side of the sleeve 240 near the pressure head 210; the pressure post 220 and the sleeve 240 are coaxial; the end of the pressure post 220 near the pressure head 210 is connected to the pressure head 210 by a quick... The quick-release structure is connected by inserting the end near the sleeve 240 into the sleeve 240. The quick-release structure includes a quick-release groove and a quick-release rod. The quick-release groove is located on the end face of the pressure head 210 near the core sample 100. The vertical cross-section of the quick-release groove is T-shaped. The quick-release groove is an arc shape coaxial with the pressure column 220. One end of the quick-release groove has an insertion groove. The width of the insertion groove is the same as the maximum width of the quick-release groove. The insertion groove and the quick-release groove are connected. The quick-release rod is fixed to the end of the pressure column 220 away from the core sample 100. The vertical cross-section of the quick-release rod is T-shaped. When installing the pressure column 220, the quick-release rod is inserted into the insertion groove. Rotating the pressure column 220 causes the quick-release rod to rotate, and the quick-release rod slides into the quick-release groove, thus connecting the pressure column 220 to the pressure head 210.

[0041] The pressure column 220, sleeve 240, and core sample 100 form a medium cavity 230; the medium cavity 230 is filled with a liquid pressure-transmitting medium.

[0042] The sealing mechanism is located between the side wall of the pressure column 220 and the inner wall of the sleeve 240. After the pressure-transmitting medium is filled into the medium cavity 230, the hydraulic cylinder drives the pressure head 210 to move the pressure column 220 downward and insert it into the pressure-transmitting medium, squeezing the medium so that it enters between the side wall of the pressure column 220 and the inner wall of the sleeve 240. When the sealing mechanism is submerged in the pressure-transmitting medium, it seals the gap between the pressure column 220 and the sleeve 240, making the medium cavity 230 sealed. This prevents air from existing between the pressure column 220 and the pressure-transmitting medium, which would cause unevenness on the end face of the pressure-transmitting medium. Furthermore, it replaces the medium with liquid... The pressure-transmitting medium is in the form of a solid shape to prevent uneven pressure on the core sample 100 due to unevenness of the upper and lower end faces. After the pressure-transmitting medium is filled in the medium cavity 230 and the sealing mechanism is submerged in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column 220 and the sleeve 240. This prevents the pressure column 220 from sealing the gap between the pressure column 220 and the sleeve 240 before it comes into contact with the pressure-transmitting medium, thereby preventing the pressure applied by the pressure column 220 to the core sample 100 from being concentrated on the peripheral wall of the core sample 100 through the sleeve 240 and reducing the influence of the sleeve 240 on the compressive strength test results of the core sample 100.

[0043] In this embodiment, the sealing mechanism includes a sealing sheet 250 and an adjusting device. Multiple sealing sheets 250 are provided and distributed circumferentially along the pressure column 220. Each sealing sheet 250 is an arc-shaped disc with its center falling on the axis of the pressure column 220. The sealing sheet 250 is inclined. One end of the sealing sheet 250 near the pressure column 220 is away from the core sample 100, and the other end is near the core sample 100. The sealing sheet 250 is an elastic sheet, and its end near the pressure column 220 is fixedly connected to the pressure column 220. A seepage gap is provided between the end of the sealing sheet 250 near the pressure column 220 and the inner wall of the sleeve 240. A rubber layer 251 is fixed to the end of the sealing sheet 250 near the pressure column 220.

[0044] Multiple sealing discs 250 are arranged in a ring shape; one end of the sealing disc 250 along the circumference of the pressure post 220 presses against the upper surface of the corresponding adjacent sealing disc 250, and the other end along the circumference of the pressure post 220 presses against the lower surface of the corresponding adjacent sealing disc 250; since one end of the sealing disc 250 along the circumference of the pressure post 220 presses against the upper surface of the corresponding adjacent sealing disc 250, and the other end along the circumference of the pressure post 220 presses against the lower surface of the corresponding adjacent sealing disc 250, when one of the sealing discs 250 rotates away from the pressure post 220 in a direction away from the core sample 100, the sealing disc 250 can drive the adjacent sealing discs 250 to rotate synchronously away from the pressure post 220 in a direction away from the core sample 100. The adjusting device is used to pull the end of the sealing plate 250 near the pressure column 220 away from the core sample 100 when the sealing plate 250 is submerged in the pressure transmitting medium, so that the leakage gap is reduced until the end of the sealing plate 250 near the pressure column 220 abuts against and seals the inner wall of the sleeve 240. Both ends of the sealing plate 250 along the circumference of the pressure column 220 are provided with clearance grooves; one clearance groove is located on the upper end face of the sealing plate 250, and the other is located on the lower end face of the sealing plate 250. The two clearance grooves on the sealing plate 250 ensure that adjacent sealing plates 250 are on the same plane.

[0045] The adjustment device includes a slide 310, a mounting hole, an adjustment structure, and a drive structure.

[0046] Multiple grooves 310 are distributed circumferentially along the pressure column 220; the grooves 310 are radially opened at the end of the pressure column 220 away from the core sample 100, and are located on the side of the sealing plate 250 away from the core sample 100; the mounting hole is opened at the end of the pressure column 220 away from the core sample 100, and communicates with the grooves 310; the mounting hole is coaxial with the pressure column 220; a central column 320 is movably installed inside the mounting hole; a connecting rod 330 is fixed on the central column 320; connection The rod 330 is arranged radially along the pressure column 220, with one end fixedly connected to the pressure column 220 and the other end hinged to the end of the sealing plate 250 near the pressure column 220; the adjustment structure is used to drive the central column 320 to move away from the core sample 100 through the connecting rod 330, so as to pull the end of the sealing plate 250 near the pressure column 220 in the direction away from the core sample 100, so that the seepage gap is reduced to the point that the end of the sealing plate 250 near the pressure column 220 abuts against and seals the inner wall of the sleeve 240.

[0047] The adjustment structure includes adjusting teeth 341 and adjusting holes 343. The adjusting teeth 341 are annular and coaxial with the central column 320. Multiple adjusting teeth 341 are distributed along the axis of the central column 320. The adjusting teeth 341 are fixed to the peripheral wall of the central column 320. The adjusting hole 343 is horizontally disposed on the side wall of the pressure column 220, located on the side of the mounting hole. The adjusting hole 343 communicates with the side wall of the mounting hole. An adjusting column 342 is rotatably installed within the adjusting hole 343. The adjusting column 342 meshes with the adjusting teeth 341. Driving the adjusting column 342 to rotate, thereby driving the central column 320 to move up and down.

[0048] The driving structure is used to drive the adjusting column 342 to rotate. The driving structure includes a driving hole 351 and a driving column 352; the driving hole 351 is located on the end face of the adjusting column 342; the driving hole 351 is hexagonal; the driving column 352 is a hexagonal column; the driving column 352 is slidably inserted into the driving hole 351 along the axis of the adjusting column 342. Rotating the driving column 352 with a wrench or pliers drives the adjusting column 342 to rotate. A limiting structure is provided between the pressure column 220 and the driving column 352; the limiting structure is used to restrict the movement of the central column 320 within the pressure column 220 when the central column 320 is driven away from the core sample 100 and the sealing plate 250 approaches the end of the pressure column 220 and abuts against and seals the inner wall of the sleeve 240.

[0049] The limiting structure includes a limiting cylinder 361 and a limiting block 363; the limiting block 363 is fixed to one end of the drive column 352; the limiting block 363 is cubic in shape; the limiting cylinder 361 is sleeved on the end of the pressure column 220 away from the core sample 100; the limiting cylinder 361 and the pressure column 220 are fixedly connected; a limiting hole 362 is opened on the side wall of the limiting cylinder 361; the limiting hole 362 is rectangular; the limiting hole 362 and the adjusting hole 343 are coaxial. By clamping the limiting block 363 with pliers, the drive column 352 is inserted into the drive hole 351, and the limiting block 363 is twisted to drive the adjusting column 342 to rotate, and the adjusting column 342 drives the center column 320 to move away from the core sample 100. When the sealing plate 250 abuts against and seals the inner side wall of the sleeve 240 near the end of the pressure column 220, the limiting block 363 is inserted into the limiting hole 362 with pliers. When it is necessary to rotate the adjusting column 342 again, clamp the limiting block 363 with pliers and pull out the limiting hole 362, then rotate the limiting block 363 with pliers.

[0050] Based on the above embodiments, the working principle and process of the present invention are as follows: In use, first put the sleeve 240 on both ends of the core sample 100 and seal the connection with glue. The pressure column 220 is installed on the upper pressure head 210 via a quick-release structure; the hydraulic cylinder drives the upper pressure head 210 to move the pressure column 220 downward and insert the pressure column 220 into the sleeve 240 above the core sample 100. The pressure column 220, sleeve 240, and core sample 100 form a medium cavity 230; a pressure-transmitting medium, such as water, is added to the medium cavity 230 of the upper sleeve 240, so that the pressure-transmitting medium enters between the side wall of the pressure column 220 and the inner side wall of the sleeve 240. When the sealing plate 250 is submerged in the pressure-transmitting medium, the limit block 363 is clamped with pliers, and the drive column 352 is inserted into the drive hole 351. The limit block 363 is twisted to drive the adjusting column 342 to rotate. The adjusting column 342 drives the center column 320 to move away from the core sample 100. Because one end of the sealing plate 250 along the circumference of the pressure post 220 presses against the upper surface of the corresponding adjacent sealing plate 250, and the other end along the circumference of the pressure post 220 presses against the lower end of the corresponding adjacent sealing plate 250, when one of the sealing plates 250 rotates away from the pressure post 220 in a direction away from the core sample 100, that sealing plate 250 can drive the adjacent sealing plates 250 to rotate synchronously away from the pressure post 220 in a direction away from the core sample 100. When the end of the sealing plate 250 close to the pressure post 220 abuts against and seals the inner wall of the sleeve 240, the limiting block 363 is inserted into the limiting hole 362 with pliers.

[0051] The sealing plate 250 seals the gap between the pressure column 220 and the sleeve 240, making the medium cavity 230 sealed. This prevents air from existing between the pressure column 220 and the pressure-transmitting medium, which would cause unevenness on the end face of the pressure-transmitting medium. Furthermore, by replacing the medium with a liquid pressure-transmitting medium, uneven pressure on the core sample 100 due to unevenness on the upper and lower end faces is prevented. After the pressure-transmitting medium is filled into the medium cavity 230 and the sealing mechanism is submerged in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column 220 and the sleeve 240. This prevents the pressure column 220 from sealing the gap between the pressure column 220 and the sleeve 240 before it comes into contact with the pressure-transmitting medium, thereby preventing the pressure applied by the pressure column 220 to the core sample 100 from being concentrated on the peripheral wall of the core sample 100 through the sleeve 240, and reducing the influence of the sleeve 240 on the compressive strength test results of the core sample 100. When the sealing plate 250 inside the sleeve 240 at one end of the core sample 100 seals the gap between the pressure column 220 and the sleeve 240, making the medium cavity 230 sealed, the pressure column 220 is removed from the pressure head 210 above, the upper and lower ends of the core sample 100 are reversed, and the unsealed sleeve 240 is facing upwards. The above process is repeated so that the medium cavities 230 at both ends of the core sample 100 are in a sealed state.

[0052] Finally, the hydraulic cylinder is activated to drive the upper pressure head 210 to push down the upper pressure column 220, providing uniform pressure to the core sample 100 through the liquid pressure transmission medium for compressive strength testing.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the compressive strength of construction roads, characterized in that: Includes frame, sleeve, and sealing mechanism; A worktable is fixed on the frame; two pressure heads are set above the frame, one above the other; the lower pressure head is fixed on the worktable, and the upper pressure head is moved up and down on the frame by a hydraulic cylinder; the core sample is placed between the two pressure heads. Two sleeves are provided, one above the other at both ends of the core sample; the sleeve axis is vertically positioned between the core sample and the pressure head; the end of the sleeve closer to the core sample is fitted onto the end of the core sample; the inner wall of the sleeve and the outer wall of the core sample are sealed together with glue; a pressure column is provided on the side of the sleeve closer to the pressure head; the pressure column and the sleeve are coaxial; the end of the pressure column closer to the pressure head is connected to the pressure head via a quick-release structure, and the end closer to the sleeve is inserted into the sleeve; The pressure column, sleeve, and core sample form a medium cavity; the medium cavity is filled with a liquid pressure-transmitting medium. The sealing mechanism is located between the side wall of the pressure column and the inner wall of the sleeve. After the pressure transmission medium is filled into the medium cavity, the hydraulic cylinder drives the pressure head to move the pressure column down and insert it into the pressure transmission medium, and squeezes the pressure transmission medium so that the pressure transmission medium enters between the side wall of the pressure column and the inner wall of the sleeve. When the sealing mechanism is submerged in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column and the sleeve, so that the medium cavity is in a sealed state. The sealing mechanism includes a sealing plate and an adjusting device; Multiple sealing plates are provided and distributed along the circumference of the pressure column; the sealing plates are arc-shaped with their centers falling on the axis of the pressure column; the sealing plates are inclined; the end of the sealing plate near the pressure column is away from the core sample, and the end away from the pressure column is close to the core sample; the sealing plate is an elastic plate, and the end near the pressure column is fixedly connected to the pressure column; an exudation gap is provided between the end of the sealing plate near the pressure column and the inner wall of the sleeve. Multiple sealing discs are arranged in a ring; one end of the sealing disc along the circumference of the pressure column presses against the upper surface of the corresponding adjacent sealing disc, and the other end along the circumference of the pressure column presses against the lower end of the corresponding adjacent sealing disc, so that when one of the sealing discs rotates away from the pressure column in the direction away from the core sample, the sealing disc can drive the adjacent sealing discs to rotate synchronously away from the pressure column in the direction away from the core sample; the adjusting device is used to pull the end of the sealing disc close to the pressure column in the direction away from the core sample when the sealing disc is immersed in the pressure transmitting medium, so that the leakage gap is reduced to the point that the end of the sealing disc close to the pressure column abuts against and seals the inner wall of the sleeve; The adjustment device includes a slide groove, a mounting hole, and an adjustment structure; multiple slide grooves are distributed circumferentially along the pressure column; the slide groove is opened radially along the pressure column at the end of the pressure column away from the core sample, and is located on the side of the sealing plate away from the core sample; The mounting hole is located at the end of the pressure column away from the core sample and is connected to the sliding groove; the mounting hole and the pressure column are coaxial; a central column is provided in the mounting hole that moves up and down; a connecting rod is fixed on the central column; the connecting rod is arranged radially along the pressure column, with one end fixedly connected to the pressure column and the other end hinged to the end of the sealing plate near the pressure column; the adjusting structure is used to drive the central column to move away from the core sample through the connecting rod, so as to pull the sealing plate near the end of the pressure column in the direction away from the core sample.

2. The device for testing the compressive strength of construction roads according to claim 1, characterized in that: A rubber layer is fixed to one end of the sealing strip near the pressure column.

3. The device for testing the compressive strength of construction roads according to claim 2, characterized in that: The adjustment structure includes adjustment teeth and adjustment holes; the adjustment teeth are annular and coaxial with the central column; multiple adjustment teeth are distributed along the axis of the central column; the adjustment teeth are fixed on the peripheral wall of the central column; the adjustment holes are horizontally set on the side wall of the pressure column and are located on the same side as the mounting hole; the side walls of the adjustment holes and the mounting holes are connected; an adjustment column is rotatably installed in the adjustment holes; the adjustment column and the adjustment teeth mesh.

4. The device for testing the compressive strength of construction roads according to claim 3, characterized in that: The adjusting device also includes a drive structure; the drive structure is used to drive the adjusting column to rotate.

5. The device for testing the compressive strength of construction roads according to claim 4, characterized in that: The drive structure includes a drive hole and a drive post; the drive hole is located on the end face of the adjustment post; the drive hole is hexagonal; the drive post is a hexagonal post; the drive post is slidably inserted into the drive hole along the axis of the adjustment post.

6. The device for testing the compressive strength of construction roads according to claim 5, characterized in that: A limiting structure is provided between the pressure column and the drive column; the limiting structure is used to restrict the movement of the central column relative to the pressure column when the central column is driven away from the core sample so that the sealing plate is close to one end of the pressure column and abuts against and seals the inner side wall of the sleeve.

7. The device for testing the compressive strength of construction roads according to claim 6, characterized in that: The limiting structure includes a limiting cylinder and a limiting block; the limiting block is fixed to one end of the drive column; the limiting block is cubic in shape; the limiting cylinder is sleeved on the end of the pressure column away from the core sample; the limiting cylinder and the pressure column are fixedly connected; a limiting hole is opened on the side wall of the limiting cylinder; the limiting hole is rectangular; the limiting hole and the adjustment hole are coaxial.

8. The device for testing the compressive strength of construction roads according to claim 1, characterized in that: The sealing strip has clearance grooves at both ends along the circumference of the pressure column; one clearance groove is located on the upper end face of the sealing strip, and the other is located on the lower end face of the sealing strip.

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