Construction road compressive strength detection device

Abstract

The invention 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, and two pressing heads arranged up and down are arranged above the rack; the lower pressing head is fixed to the workbench, and the upper pressing head is arranged on the machine frame in an up-down moving mode through a hydraulic cylinder. A core sample is placed between the two pressure heads; a pressing column is arranged on the side, close to the pressing head, of the sleeve. A medium cavity is defined by the pressing column, the sleeve and the core sample; and the medium cavity is filled with a liquid pressure transmission medium. When the sealing mechanism is immersed into the pressure transmitting medium, the sealing mechanism seals a gap between the pressing column and the sleeve, so that the medium cavity is in a sealed state; the phenomenon that air exists between the pressure column and the pressure transmitting medium, and consequently the end face of the pressure transmitting medium is uneven is avoided, the medium is replaced with the liquid pressure transmitting medium, and the phenomenon that the upper end face and the lower end face of the core sample are uneven, and consequently pressure borne by the core sample is uneven is avoided.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to a construction road compressive strength detection device. Background Art

[0002] The road surface is a layered structure paved on the roadbed with various materials for vehicles to travel. The road surface is the main component of the highway, and its quality will directly affect the driving speed, safety and transportation cost. The pavement structure layer is generally composed of the surface layer, the base layer and the cushion layer. The roadbed base layer includes crushed stone, gravel and stabilized soil. The roadbed material needs to be screened, tested and processed before the roadbed base can be laid normally. The existing roadbed and pavement material strength detection system is to take the sample core through the sampling equipment, and then perform a pressure test on the core sample to see if the core sample can bear the corresponding pressure. Since the upper and lower end surfaces of the core sample after sampling may be uneven or inclined. Therefore, before the press is put on, it is necessary to use a cutting device to cut the two ends of the core sample, which is time-consuming and labor-intensive.

[0003] In the prior art, for example, the Chinese patent with the announcement number CN111220466B, entitled A road compressive strength testing device and testing method, states in the public technical solution that the upper pressure head of the press transmits pressure to the upper end face of the core sample through the upper sand, and the lower pressure head of the press transmits pressure to the lower end face of the core sample through the lower sand, so that the core sample can be subjected to the compression test without cutting. However, due to the large flow resistance between the sand particles, the fluidity of the sand is affected, and due to the unevenness of the upper and lower end faces of the core sample, the thickness of the sand between the pressure head and the end face of the core sample is different, which may cause the pressure applied by the pressure head to different positions on the end face of the core sample to be different, thereby affecting the detection effect. Summary of the invention

[0004] The present invention provides a construction road compressive strength detection device to solve the above problems.

[0005] A construction road compressive strength detection device of the present invention adopts the following technical scheme: a construction road compressive strength detection device comprises a frame, a sleeve and a sealing mechanism.

[0006] A workbench is fixed on the frame; two pressing heads are arranged up and down above the frame; the lower pressing head is fixed on the workbench, and the upper pressing head is arranged on the frame to move up and down through a hydraulic cylinder; the core sample is placed between the two pressing heads.

[0007] There are two sleeves, which are distributed at both ends of the core sample up and down; the axis of the sleeve is vertically arranged between the core sample and the pressure head; the end of the sleeve close to the core sample is sleeved on the end of the core sample; the inner wall of the sleeve and the outer wall of the core sample are sealed and connected by glue; a pressure column is provided on the side of the sleeve close to the pressure head; the pressure column and the sleeve are coaxial; the end of the pressure column close to the pressure head is connected to the pressure head through a quick release structure, and the end close 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 liquid pressure transmission medium.

[0009] The sealing mechanism is arranged 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 drive the pressure column to move downward and insert 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, and when the sealing mechanism is immersed in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column and the sleeve to make the medium cavity in a sealed state; avoid the existence of air between the pressure column and the pressure transmission medium, which makes the end face of the pressure transmission medium uneven, and replace the medium with a liquid pressure transmission medium to prevent uneven pressure on the core sample due to the uneven upper and lower end faces of the core sample; and after the pressure transmission medium is filled in the medium cavity and the sealing mechanism is immersed in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column and the sleeve to avoid sealing the gap between the pressure column and the sleeve without the pressure column contacting the pressure transmission medium, thereby avoiding the pressure exerted by the pressure column on the core sample through the sleeve and concentrating on the peripheral wall of the core sample, thereby reducing the influence of the sleeve on the compressive strength test result of the core sample.

[0010] Furthermore, the sealing mechanism includes a sealing sheet and an adjusting device; a plurality of sealing sheets are provided and distributed along the circumference of the pressure column; the sealing sheet is in the shape of an arc with the center falling on the axis of the pressure column; the sealing sheet is arranged at an angle; the end of the sealing sheet close to 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 close to the pressure column is fixedly connected to the pressure column; a seepage gap is arranged between the end of the sealing sheet close to the pressure column and the inner wall of the sleeve.

[0011] A plurality of sealing sheets are enclosed in a ring shape; one end of the sealing sheet along the circumference of the pressure column presses against the upper end surface of the corresponding adjacent sealing sheet, and the other end along the circumference of the pressure column presses against the lower end of the corresponding adjacent sealing sheet; because one end of the sealing sheet along the circumference of the pressure column presses against the upper end surface of the corresponding adjacent sealing sheet, and the other end along the circumference of the pressure column presses against the lower end of the corresponding adjacent sealing sheet, when one end of one of the sealing sheets away from the pressure column rotates in a direction away from the core sample, the sealing sheet can drive the end of the adjacent sealing sheet away from the pressure column to rotate synchronously in a direction away from the core sample. The adjusting device is used to pull the end of the sealing sheet close to the pressure column in a direction away from the core sample when the sealing sheet is immersed in the pressure transmission medium, so that the seepage gap is reduced to the point where the end of the sealing sheet 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 close to the pressure column.

[0013] Furthermore, the adjustment device includes a slide slot, a mounting hole, and an adjustment structure; There are multiple slide grooves distributed along the circumference of the pressure column; the slide groove is opened along the radial direction of the pressure column at the end of the pressure column away from the core sample, and is located on the side of the sealing sheet away from the core sample; The mounting hole is opened at the end of the pressure column away from the core sample and is connected to the slide groove; the mounting hole and the pressure column are coaxial; a center column is provided in the mounting hole so as to move up and down; a connecting rod is fixed on the center column; the connecting rod is arranged radially along the pressure column, one end of which is fixedly connected to the pressure column, and the other end is hinged to the end of the sealing plate close to the pressure column; the adjustment structure is used to drive the center column to move away from the core sample through the connecting rod, so as to pull the end of the sealing plate close to the pressure column in the direction away from the core sample, so that the seepage gap is reduced to the point where the end of the sealing plate close to the pressure column abuts against and seals the inner wall of the sleeve.

[0014] Furthermore, the adjustment structure includes an adjustment tooth and an adjustment hole; the adjustment tooth is annular and coaxial with the center column; a plurality of adjustment teeth are distributed along the axis of the center column; the adjustment tooth is fixed on the peripheral wall of the center column; the adjustment hole is horizontally arranged on the side wall of the pressure column and is located on one side of the mounting hole; the adjustment hole is connected to the side wall of the mounting hole; an adjustment column is rotatably installed in the adjustment hole; the adjustment column and the adjustment tooth are meshed, driving the adjustment column to rotate, thereby driving the center column to move up and down.

[0015] Furthermore, the adjusting device also includes a driving structure; the driving structure is used to drive the adjusting column to rotate.

[0016] Furthermore, the driving structure includes a driving hole and a driving column; the driving hole is arranged on the end surface of the adjusting column; the driving hole is hexagonal; the driving column is a hexagonal column; the driving column is slidably inserted into the driving hole along the axis of the adjusting column. The adjusting column is driven to rotate by rotating the driving column with a wrench or pliers.

[0017] Furthermore, a limiting structure is provided between the pressure column and the driving column; the limiting structure is used to limit the movement of the center column in the pressure column when the center column is driven away from the core sample and the sealing sheet is close to one end of the pressure column and abuts and seals against the inner wall of the sleeve.

[0018] Furthermore, the limiting structure includes a limiting cylinder and a limiting block; the limiting block is fixed at one end of the driving column; the limiting block is in the shape of a cube; 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 provided on the side wall of the limiting cylinder; the limiting hole is rectangular; the limiting hole and the adjustment hole are coaxial. Clamp the limiting block with pliers, insert the driving column into the driving hole, twist the limiting block to drive the adjustment column to rotate, and the adjustment column drives the center column to move away from the core sample. When the sealing sheet is close to one end of the pressure column and abuts against and seals the inner wall of the sleeve, insert the limiting block into the limiting hole with pliers. When the adjustment column needs to be rotated again, clamp the limiting block with pliers and pull out the limiting hole, and then rotate the limiting block with pliers.

[0019] Furthermore, avoidance grooves are provided at both ends of the sealing sheet along the circumference of the pressure column; one avoidance groove is provided on the upper end surface of the sealing sheet, and the other is provided on the lower end surface of the sealing sheet, and the two avoidance grooves on the sealing sheet enable adjacent sealing sheets to be in the same plane.

[0020] The beneficial effects of the present invention are as follows: after the pressure transmission medium is filled into the medium cavity, the hydraulic cylinder drives the pressure head to drive the pressure column to move downward and insert 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, and 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; it is avoided that there is air between the pressure column and the pressure transmission medium, which makes the end face of the pressure transmission medium uneven, and the medium is replaced with a liquid pressure transmission medium to prevent uneven pressure on the core sample due to the uneven upper and lower end faces of the core sample; and after the pressure transmission medium is filled in the medium cavity and the sealing mechanism is immersed in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column and the sleeve, so as to avoid sealing the gap between the pressure column and the sleeve without the pressure column contacting the pressure transmission medium, thereby avoiding the pressure applied by the pressure column to the core sample through the sleeve and concentrating on the peripheral wall of the core sample, thereby reducing the influence of the sleeve on the compressive strength test result of the core sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a construction road compressive strength detection device of the present invention; Figure 2 A side view of an embodiment of a construction road compressive strength detection device of the present invention; Figure 3 for Figure 2 Sectional view at AA in the middle; Figure 4 for Figure 3 Enlarged view of point C in the middle; Figure 5 This is a state diagram of a sealing sheet sealing a medium cavity in an embodiment of a construction road compressive strength detection device of the present invention; Figure 6 for Figure 5 The enlarged view of point D in the middle; Figure 7 A schematic diagram of a sealing mechanism and a compression column of an embodiment of a construction road compressive strength detection device of the present invention; Figure 8 A side view of a sealing mechanism and a compression column of an embodiment of a construction road compressive strength detection device of the present invention; Fig. 9 A top view of a sealing mechanism and a compression column of an embodiment of a construction road compressive strength detection device of the present invention; Fig.10 for Fig. 9 Sectional view at the middle BB; Fig.11 An exploded view of a sealing mechanism and a compression column of an embodiment of a construction road compressive strength detection device of the present invention; Fig.12 It is a schematic diagram of a driving column and a limit block of an embodiment of a construction road compressive strength detection device of the present invention.

[0023] In the figure: 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, driving hole; 352, driving column; 361, limiting cylinder; 362, limiting hole; 363, limiting block. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] An embodiment of a construction road compressive strength detection device of the present invention is as follows Figures 1 to 12 As shown, it includes a frame 200, a sleeve 240, and a sealing mechanism.

[0026] A workbench is fixed on the frame 200; two pressing heads 210 are arranged vertically above the frame 200; the lower pressing head 210 is fixed on the workbench, and the upper pressing head 210 is arranged on the frame 200 to be moved up and down by a hydraulic cylinder; the core sample 100 is placed between the two pressing heads 210.

[0027] There are two sleeves 240, which are distributed at both ends of the core sample 100 in the upper and lower parts; the axis of the sleeve 240 is vertically arranged between the core sample 100 and the pressure head 210; the end of the sleeve 240 close to the core sample 100 is sleeved on 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 by glue; a pressure column 220 is arranged on the side of the sleeve 240 close to the pressure head 210; the pressure column 220 and the sleeve 240 are coaxial; the end of the pressure column 220 close to the pressure head 210 and the pressure head 210 are connected by a quick The quick-release structure is connected, and the end close to the sleeve 240 is inserted into the sleeve 240; the quick-release structure includes a quick-release groove and a quick-release rod; the quick-release groove is provided on the end face of the pressure head 210 close to the core sample 100; the vertical section of the quick-release groove is T-shaped; the quick-release groove is an arc shape coaxial with the pressure column 220; an insertion groove is provided at one end of the quick-release groove; the maximum width of the insertion groove and the quick-release groove is the same; 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 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, and the rotation of the pressure column 220 drives the quick-release rod to rotate, and the quick-release rod slides into the quick-release groove, thereby connecting the pressure column 220 to the pressure head 210.

[0028] The pressure column 220 , the sleeve 240 , and the core sample 100 form a medium cavity 230 ; the medium cavity 230 is filled with a liquid pressure transmission medium.

[0029] The sealing mechanism is arranged between the side wall of the pressure column 220 and the inner wall of the sleeve 240; after the pressure medium is filled into the medium cavity 230, the hydraulic cylinder drives the pressure head 210 to drive the pressure column 220 to move downward and insert into the pressure medium, and squeeze the pressure medium, so that the pressure medium enters between the side wall of the pressure column 220 and the inner wall of the sleeve 240, and when the sealing mechanism is immersed in the pressure medium, the sealing mechanism seals the gap between the pressure column 220 and the sleeve 240, so that the medium cavity 230 is in a sealed state; avoid the existence of air between the pressure column 220 and the pressure medium, which makes the end surface of the pressure medium uneven, and replace the medium with liquid The body-shaped pressure transmission medium prevents uneven pressure on the core sample 100 due to the unevenness of the upper and lower end surfaces of the core sample 100; and after the pressure transmission medium is filled in the medium cavity 230 and the sealing mechanism is immersed in the pressure transmission medium, the sealing mechanism seals the gap between the pressure column 220 and the sleeve 240, avoiding the pressure column 220 and the sleeve 240 from sealing the gap between the pressure column 220 and the sleeve 240 without contacting the pressure transmission medium, thereby avoiding the pressure column 220 applying pressure to the core sample 100 through the sleeve 240 and concentrating it on the surrounding wall of the core sample 100, reducing the influence of the sleeve 240 on the compressive strength test result of the core sample 100.

[0030] In this embodiment, the sealing mechanism includes a sealing sheet 250 and an adjusting device; a plurality of sealing sheets 250 are provided and distributed along the circumference of the pressure column 220; the sealing sheet 250 is in the shape of an arc with the center of the circle falling on the axis of the pressure column 220; the sealing sheet 250 is arranged obliquely; the end of the sealing sheet 250 close to the pressure column 220 is far away from the core sample 100, and the end away from the pressure column 220 is close to the core sample 100; the sealing sheet 250 is an elastic sheet, and the end close to 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 close to the pressure column 220 and the inner side wall of the sleeve 240. A rubber layer 251 is fixed to the end of the sealing sheet 250 close to the pressure column 220.

[0031] A plurality of sealing sheets 250 are enclosed in a ring shape; one end of the sealing sheet 250 along the circumference of the pressure column 220 is pressed against the upper end surface of the corresponding adjacent sealing sheet 250, and the other end along the circumference of the pressure column 220 is pressed against the lower end of the corresponding adjacent sealing sheet 250; because one end of the sealing sheet 250 along the circumference of the pressure column 220 is pressed against the upper end surface of the corresponding adjacent sealing sheet 250, and the other end along the circumference of the pressure column 220 is pressed against the lower end of the corresponding adjacent sealing sheet 250, when one end of one of the sealing sheets 250 away from the pressure column 220 rotates in a direction away from the core sample 100, the sealing sheet 250 can drive the end of the adjacent sealing sheet 250 away from the pressure column 220 to rotate synchronously in a direction away from the core sample 100. The adjusting device is used to pull the end of the sealing sheet 250 close to the pressure column 220 away from the core sample 100 when the sealing sheet 250 is immersed in the pressure transmission medium, so that the seepage gap is reduced until the end of the sealing sheet 250 close to the pressure column 220 abuts and seals against the inner wall of the sleeve 240. The sealing sheet 250 is provided with avoidance grooves at both ends along the circumference of the pressure column 220; one avoidance groove is provided on the upper end surface of the sealing sheet 250, and the other is provided on the lower end surface of the sealing sheet 250. The two avoidance grooves on the sealing sheet 250 make the adjacent sealing sheets 250 in the same plane.

[0032] The adjusting device includes a slide slot 310, a mounting hole, an adjusting structure, and a driving structure.

[0033] There are multiple slide grooves 310 distributed along the circumference of the pressure column 220; the slide grooves 310 are opened along the radial direction of the pressure column 220 at the end of the pressure column 220 away from the core sample 100, and are located on the side of the sealing sheet 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 is connected to the slide groove 310; the mounting hole and the pressure column 220 are coaxial; a center column 320 is provided in the mounting hole so as to move up and down; a connecting rod 330 is fixed on the center column 320; the ... The rod 330 is arranged radially along the pressure column 220, one end of which is fixedly connected to the pressure column 220, and the other end is hinged to the end of the sealing sheet 250 close to 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 sheet 250 close to the pressure column 220 away from the core sample 100, so that the seepage gap is reduced to the end of the sealing sheet 250 close to the pressure column 220 abutting and sealing against the inner wall of the sleeve 240.

[0034] The adjustment structure includes an adjustment tooth 341 and an adjustment hole 343; the adjustment tooth 341 is annular and coaxial with the center column 320; a plurality of adjustment teeth 341 are distributed along the axis of the center column 320; the adjustment tooth 341 is fixed on the peripheral wall of the center column 320; the adjustment hole 343 is horizontally arranged on the side wall of the pressure column 220 and is located on one side of the mounting hole; the adjustment hole 343 is connected to the side wall of the mounting hole; an adjustment column 342 is rotatably installed in the adjustment hole 343; the adjustment column 342 is meshed with the adjustment tooth 341. The adjustment column 342 is driven to rotate, thereby driving the center column 320 to move up and down.

[0035] 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 provided 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. The adjusting column 342 is driven to rotate by rotating the driving column 352 with a wrench or pliers. A limiting structure is provided between the pressure column 220 and the driving column 352; the limiting structure is used to limit the movement of the central column 320 in the pressure column 220 when the central column 320 is driven away from the core sample 100 and the end of the sealing sheet 250 close to the pressure column 220 abuts against and seals the inner wall of the sleeve 240.

[0036] The limiting structure includes a limiting cylinder 361 and a limiting block 363; the limiting block 363 is fixed at one end of the driving column 352; the limiting block 363 is in a cubic 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 provided on the side wall of the limiting cylinder 361; the limiting hole 362 is rectangular; the limiting hole 362 and the adjustment hole 343 are coaxial. Clamp the limiting block 363 with pliers, insert the driving column 352 into the driving hole 351, twist the limiting block 363 to drive the adjustment column 342 to rotate, and the adjustment column 342 drives the center column 320 to move away from the core sample 100. When the end of the sealing sheet 250 close to the pressure column 220 abuts against and seals the inner wall of the sleeve 240, insert the limiting block 363 into the limiting hole 362 with pliers. When the adjusting column 342 needs to be rotated again, the limiting block 363 is clamped with pliers and the limiting hole 362 is pulled out, and then the limiting block 363 is rotated with pliers.

[0037] In combination with the above embodiments, the use principle and working process of the present invention are as follows: when 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 through a quick-release structure; the hydraulic cylinder drives the upper pressure head 210 to drive the pressure column 220 to move downward, and insert the pressure column 220 into the sleeve 240 above the core sample 100, and the pressure column 220, the sleeve 240, and the core sample 100 form a medium cavity 230; a pressure transmission medium, such as water or other liquids, is added to the medium cavity 230 of the upper sleeve 240 to allow the pressure transmission medium to enter between the side wall of the pressure column 220 and the inner wall of the sleeve 240, and when the sealing sheet 250 is immersed in the pressure transmission medium, the limit block 363 is clamped by pliers, the drive column 352 is inserted into the drive hole 351, and the limit block 363 is twisted to drive the adjustment column 342 to rotate, and the adjustment column 342 drives the center column 320 to move away from the core sample 100. Since one end of the sealing sheet 250 along the circumference of the pressure column 220 presses against the upper end surface of the corresponding adjacent sealing sheet 250, and the other end along the circumference of the pressure column 220 presses against the lower end of the corresponding adjacent sealing sheet 250, when one end of one sealing sheet 250 away from the pressure column 220 rotates in a direction away from the core sample 100, the sealing sheet 250 can drive the end of the adjacent sealing sheet 250 away from the pressure column 220 to rotate synchronously in a direction away from the core sample 100. When the end of the sealing sheet 250 close to the pressure column 220 abuts against the inner wall of the sleeve 240 and seals, the limit block 363 is inserted into the limit hole 362 with pliers.

[0038] The sealing sheet 250 seals the gap between the pressure column 220 and the sleeve 240 to make the medium cavity 230 sealed; avoids the presence of air between the pressure column 220 and the pressure-transmitting medium, which would make the end surface of the pressure-transmitting medium uneven, and replaces the medium with a liquid pressure-transmitting medium to prevent uneven pressure on the core sample 100 due to the uneven upper and lower end surfaces of the core sample 100; and after the pressure-transmitting medium is filled in the medium cavity 230 and the sealing mechanism is immersed in the pressure-transmitting medium, the sealing mechanism seals the gap between the pressure column 220 and the sleeve 240 to avoid sealing the gap between the pressure column 220 and the sleeve 240 without the pressure column 220 contacting the pressure-transmitting medium, thereby avoiding the pressure column 220 applying pressure to the core sample 100 through the sleeve 240 and concentrating it on the peripheral wall of the core sample 100, thereby reducing the influence of the sleeve 240 on the compressive strength test result of the core sample 100. When the sealing sheet 250 in the sleeve 240 at one end of the core sample 100 seals the gap between the pressure column 220 and the sleeve 240, so that the medium cavity 230 is in a sealed state, remove the pressure column 220 from the pressure head 210 above, turn the upper and lower ends of the core sample 100 upside down, and turn the unsealed sleeve 240 upwards, and repeat the above process so that the medium cavities 230 at both ends of the core sample 100 are in a sealed state.

[0039] Finally, the hydraulic cylinder is started to drive the upper pressure head 210 to drive the upper pressure column 220 to press down, and the liquid pressure medium is used to provide uniform pressure to the core sample 100 for compressive strength testing.

[0040] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction road compressive strength testing device, characterized in that: It includes a frame, a sleeve, and a sealing mechanism; A workbench is fixed on the frame; two pressure heads are arranged above the frame; the lower pressure head is fixed on the workbench, and the upper pressure head is arranged on the frame to move up and down through a hydraulic cylinder; the core sample is placed between the two pressure heads; There are two sleeves, which are distributed at both ends of the core sample in the upper and lower parts; the sleeve axis is vertically arranged between the core sample and the pressure head; the end of the sleeve close to the core sample is sleeved on the end of the core sample; the inner wall of the sleeve and the outer wall of the core sample are sealed and connected by glue; a pressure column is arranged on the side of the sleeve close to the pressure head; the pressure column and the sleeve are coaxial; the end of the pressure column close to the pressure head is connected to the pressure head through a quick release structure, and the end close 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 liquid pressure transmission medium; The sealing mechanism is arranged 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 drive the pressure column to move downward and insert into the pressure transmission medium, and squeeze 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, and 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.

2. A construction road compressive strength detection device according to claim 1, characterized in that: The sealing mechanism includes a sealing sheet and an adjusting device; There are multiple sealing sheets, which are distributed along the circumference of the pressure column; the sealing sheets are in the shape of an arc with the center of the circle falling on the axis of the pressure column; the sealing sheets are arranged obliquely; the end of the sealing sheet close to the pressure column is far 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 close to the pressure column is fixedly connected to the pressure column; a seepage gap is arranged between the end of the sealing sheet close to the pressure column and the inner wall of the sleeve; A plurality of sealing sheets are enclosed in a ring shape; one end of the sealing sheet along the circumference of the pressure column is pressed against the upper end surface of the corresponding adjacent sealing sheet, and the other end along the circumference of the pressure column is pressed against the lower end of the corresponding adjacent sealing sheet; the adjusting device is used to pull the end of the sealing sheet close to the pressure column away from the core sample when the sealing sheet is immersed in the pressure transmitting medium, so that the seepage gap is reduced until the end of the sealing sheet close to the pressure column abuts and seals against the inner wall of the sleeve.

3. A construction road compressive strength detection device according to claim 2, characterized in that: A rubber layer is fixed to one end of the sealing sheet close to the pressure column.

4. A construction road compressive strength testing device according to claim 3, characterized in that: The adjusting device comprises a slide groove, a mounting hole and an adjusting structure; a plurality of slide grooves are distributed along the circumference of the pressure column; the slide groove is opened along the radial direction of the pressure column at an end of the pressure column away from the core sample and is located on the side of the sealing sheet away from the core sample; The mounting hole is provided at the end of the pressure column away from the core sample and is connected to the slide groove; the mounting hole and the pressure column are coaxial; a center column is provided in the mounting hole so as to move up and down; a connecting rod is fixed on the center column; the connecting rod is arranged radially along the pressure column, one end of the connecting rod is fixedly connected to the pressure column, and the other end is hinged to the end of the sealing plate close to the pressure column; the adjustment structure is used to drive the center column to move away from the core sample through the connecting rod, so as to pull the end of the sealing plate close to the pressure column in the direction away from the core sample.

5. A construction road compressive strength testing device according to claim 4, characterized in that: The adjustment structure includes an adjustment tooth and an adjustment hole; the adjustment tooth is annular and coaxial with the center column; a plurality of adjustment teeth are distributed along the axis of the center column; the adjustment tooth is fixed on the peripheral wall of the center column; the adjustment hole is horizontally arranged on the side wall of the pressure column and is located on one side of the mounting hole; the adjustment hole is connected to the side wall of the mounting hole; an adjustment column is rotatably installed in the adjustment hole; the adjustment column and the adjustment tooth are meshed.

6. A construction road compressive strength testing device according to claim 5, characterized in that: The adjusting device also includes a driving structure; the driving structure is used for driving the adjusting column to rotate.

7. A construction road compressive strength testing device according to claim 6, characterized in that: The driving structure comprises a driving hole and a driving column; the driving hole is arranged on the end surface of the adjusting column; the driving hole is hexagonal; the driving column is a hexagonal column; the driving column is slidably inserted into the driving hole along the axis of the adjusting column.

8. A construction road compressive strength testing device according to claim 7, characterized in that: A limiting structure is provided between the pressure column and the driving column; the limiting structure is used to limit the movement of the center column in the pressure column when the center column is driven away from the core sample and the end of the sealing sheet close to the pressure column abuts and seals against the inner wall of the sleeve.

9. A construction road compressive strength testing device according to claim 8, characterized in that: The limiting structure includes a limiting cylinder and a limiting block; the limiting block is fixed at one end of the driving column; the limiting block is in a cubic shape; the limiting cylinder is sleeved at 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.

10. A construction road compressive strength testing device according to claim 2, characterized in that: Both ends of the sealing sheet along the circumference of the pressure column are provided with avoidance grooves; one avoidance groove is provided on the upper end surface of the sealing sheet, and the other is provided on the lower end surface of the sealing sheet.

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