A concrete strength testing device for civil engineering quality testing

Abstract

The present invention relates to the technical field of concrete strength detection, and discloses a concrete strength detection device for civil engineering quality detection, comprising a gas chamber, a hammer, a recoil piece and a distance measuring mechanism, wherein the gas chamber is provided with an exhaust pipe, the inner end of the exhaust pipe is provided with an opening and closing piece, the opening and closing piece can open or close the exhaust pipe, the gas chamber is provided with a pressurizing mechanism, the pressurizing mechanism can increase the internal pressure of the gas chamber; the hammer is slidably mounted on the exhaust pipe, the hammer is used to impact the pre-detected concrete piece, so as to characterize the strength of the pre-detected concrete piece by the impact force when crushing; the recoil piece is convexly arranged at the impact end of the hammer, and slides with the hammer along the axial direction of the hammer; the distance measuring mechanism is used to detect the relative displacement between the recoil piece and the hammer, so as to characterize the impact force of the hammer. The device can solve the problem that the strength limit of the sample cannot be accurately detected when the strength of the concrete sample is detected by impact.

Description

Technical Field

[0001] The invention relates to the technical field of concrete strength detection, and in particular to a concrete strength detection device for civil engineering quality detection. Background Art

[0002] In order to avoid structural strength problems after the concrete building is completed, it is necessary to prepare concrete samples in advance before construction, and then test the strength of the samples to ensure that the strength of the samples meets the requirements.

[0003] There are two common existing testing methods. One is to apply pressure to the sample by extrusion to test the strength limit of the sample; the other is to apply pressure to the sample by impact to test the strength limit of the sample.

[0004] In the field of construction engineering, concrete structures are generally plate-like structures with a certain thickness. Therefore, in order to fully simulate the actual situation, concrete specimens are generally prepared as plate-like specimens with a certain surface area.

[0005] For the above-mentioned types of specimens, due to their plate-like structural features and large surface area, applying pressure by extrusion requires a matching large-area pressure plate. Due to the internal unevenness of the specimen and the local differences in the external shape, the stress conditions at various positions of the pressure plate are different, which causes the pressure plate to gradually deform or bend, affecting the accuracy of subsequent test results. Therefore, the impact method is more suitable.

[0006] At present, the problem faced by using impact method for testing is that it is impossible to accurately quantify and transform the relationship between the impact force and the strength of the sample, and thus it is impossible to accurately detect the strength limit of the sample. Summary of the invention

[0007] The purpose of the present invention is to provide a concrete strength testing device for civil engineering quality testing, so as to solve the problem that the strength limit of a concrete sample cannot be accurately detected when the concrete sample strength is tested by impact.

[0008] The present invention is achieved through the following technical solutions:

[0009] A concrete strength testing device for quality inspection of civil engineering projects comprises: an air bin, wherein the air bin is provided with an exhaust pipe, wherein the inner end of the exhaust pipe is provided with an opening and closing member, wherein the opening and closing member can open or close the exhaust pipe, wherein the air bin is provided with a pressurizing mechanism, wherein the pressurizing mechanism can increase the internal pressure of the air bin; a hammer bullet, wherein the hammer bullet is slidably mounted on the exhaust pipe, wherein the hammer bullet is used to impact a pre-inspected concrete member, so as to characterize the strength of the pre-inspected concrete member through the impact force during crushing; a recoil member, wherein the recoil member is convexly arranged at the impact end of the hammer bullet, and is slidably matched with the hammer bullet along the axial direction of the hammer bullet; and a distance measuring mechanism, wherein the distance measuring mechanism is used to detect the relative displacement between the recoil member and the hammer bullet, so as to characterize the impact force of the hammer bullet.

[0010] Optionally, the boosting mechanism includes a boosting piston and a boosting cylinder, and the boosting piston is slidably and tightly arranged in the air bin; the boosting cylinder is fixed to the air bin, and the push rod of the boosting cylinder is connected to the boosting piston; the inner wall of the air bin on one side connected to the exhaust pipe is paved with a buffer layer, and the buffer layer is used to contact and squeeze the boosting piston.

[0011] Optionally, the exhaust pipe is a hard pipe; the outer end of the exhaust pipe extends radially inward to form a limiting edge, and the inner surface of the limiting edge is paved with a buffer ring; the outer diameter of the hammer bullet matches the inner diameter of the limiting edge, and the tail end of the hammer bullet extends outward to form a limiting disk, and the outer diameter of the limiting disk matches the inner diameter of the exhaust pipe; the hammer bullet is hollow to form a recoil slide, and the diameter of the recoil slide matches the diameter of the recoil member; a plurality of air holes are opened on the side wall of the tail of the hammer bullet, and the air holes are all connected to the recoil slide; when the limiting disk is flush with the inner end of the exhaust pipe, all the air holes are located inside the exhaust pipe; when the limiting disk is in contact with the buffer ring, all the air holes are located outside the exhaust pipe.

[0012] Optionally, the ranging mechanism includes a slider pointer and a sealing plate; a sliding hole is axially opened on the side wall of the impact end of the hammer bullet, the inner side of the sliding hole is connected to the recoil slideway, and the sliding hole is provided with ranging scale lines along the length direction; the slider pointer is connected to the side wall of the recoil component and is located in the middle of the recoil component, the slider pointer is slidably matched with the sliding hole, and the slider pointer can point to the ranging scale lines; the sealing plate is connected to the slider pointer, and the sealing plate is used to close the portion of the sliding hole located between the slider pointer and one end of the sliding hole away from the impact end of the hammer bullet.

[0013] Optionally, a plate groove is formed on the hole wall in the width direction of the sliding hole, the plate groove extends in the direction toward the tail end of the hammer bullet and is connected with at least one of the air holes; the sealing plate is slidably matched with the plate groove; when the slider pointer is located at the end of the sliding hole close to the impact end of the hammer bullet, the sealing plate completely closes the sliding hole; when the slider pointer is located at the end of the sliding hole away from the impact end of the hammer bullet, the sliding hole is completely open.

[0014] Optionally, a support positioning plate is provided on one side of the gas bin where the exhaust pipe is provided, the support positioning plate is used to contact and squeeze the surface of the pre-detection concrete member, the support positioning plate is arranged perpendicular to the axial direction of the exhaust pipe, a through hole is opened in the middle of the support positioning plate, the through hole is arranged coaxially with the exhaust pipe, and the aperture of the through hole is larger than the outer diameter of the hammer bullet; an elastic layer is laid on the side of the support positioning plate away from the gas bin; when the limit plate contacts the buffer ring, the impact end of the hammer bullet passes over the elastic layer and impacts the surface of the pre-detection concrete member.

[0015] Optionally, it also includes a frame, which includes a workbench, multiple columns and a top plate; the top surface of the workbench is horizontal and is used to place and support pre-inspected concrete members, and the columns are vertically arranged on the top surface of the workbench; the top plate is horizontally arranged and slidably cooperates with all the columns, and is provided with a first fixing member, the first fixing member is used to fix the top plate relative to the columns; the top plate is horizontally slidably connected to a cross beam, and the sliding direction is parallel to the width direction of the cross beam, and is provided with a second fixing member, the second fixing member is used to fix the cross beam relative to the top plate; the cross beam is slidably connected to a slider along the length direction, and is provided with a third fixing member, the third fixing member is used to fix the slider relative to the cross beam; the gas chamber is fixedly connected to the slider so that the exhaust pipe is vertically downward; the top plate is provided with horizontal scale lines for determining the displacement of the cross beam; the cross beam is provided with longitudinal scale lines for determining the displacement of the slider.

[0016] Optionally, it also includes a pressing frame, which is horizontally arranged between the top plate and the workbench and slidably cooperates with all the columns; the part of the column located between the workbench and the pressing frame is provided with a first spring; the part of the column located between the pressing frame and the top plate is provided with a second spring; when the first spring and the second spring are both in a natural state, the pressing frame and the top plate are both suspended in the air; when the top plate is pressed down until the elastic layer contacts and squeezes the surface of the pre-detection concrete piece, the pressing frame also contacts and squeezes the surface of the pre-detection concrete piece.

[0017] Optionally, the pressing frame is a rectangular frame; a pair of transverse pressing bars and a pair of longitudinal pressing bars are provided in the pressing frame, the transverse pressing bars are parallel to the cross beam, and the longitudinal pressing bars are perpendicular to the cross beam; the transverse pressing bars are fixedly connected to the inner wall of the pressing frame; the longitudinal pressing bars are slidably connected to the inner wall of the pressing frame through a cylinder.

[0018] Optionally, the bottom surfaces of the transverse pressure strip and the longitudinal pressure strip are provided with a leveling mechanism, and the leveling mechanism includes multiple hinged seats, multiple pressure heads and multiple support rods; two of the hinged seats are fixedly provided at both ends of the bottom surfaces of the transverse pressure strip and the longitudinal pressure strip, and the other hinged seats are slidably arranged on the transverse pressure strip or the longitudinal pressure strip along the length direction; one pressure head is provided between two adjacent hinged seats, and the two hinged seats are respectively hinged to the corresponding pressure head axis through one support rod; the pressure head is used to contact and squeeze the top surface of the pre-inspected concrete member.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] The present invention provides a concrete strength testing device for quality inspection of civil construction projects. The device provides a gas bin and a pressurizing mechanism, and an exhaust pipe is provided in the gas bin, and an opening and closing member is provided in the exhaust pipe. The opening and closing member is used to first close the exhaust pipe to make the gas bin airtight, and then the internal pressure of the gas bin is increased by the pressurizing mechanism. When the internal pressure reaches a preset value, the exhaust pipe is opened by the opening and closing member, so that the high-pressure gas in the gas bin quickly penetrates into the exhaust pipe, thereby increasing the air pressure in the exhaust pipe instantly. On this basis, a hammer bullet is slidably provided in the exhaust pipe. When the air pressure in the exhaust pipe increases instantly, the hammer bullet will be quickly pushed to slide along the exhaust pipe, thereby colliding with the pre-detected concrete member, so as to achieve the purpose of conducting concrete sample strength inspection by collision. On this basis, a recoil member is provided. Before the hammer bullet is about to collide with the pre-detected concrete member, the recoil member first contacts with the pre-detected concrete member. Then, under the impact of the hammer, according to the reaction force, the recoil piece will recoil along the axial direction of the hammer and away from the pre-detected concrete piece; on this basis, by setting a distance measuring mechanism, the relative displacement of the recoil piece and the hammer is detected, and the recoil distance of the recoil piece can be obtained; since the recoil distance is related to the impact force of the hammer, and the impact force of the hammer can be related to the strength of the pre-detected concrete piece, the relative displacement accurately collected by the distance measuring mechanism is used for fitting, and the functional relationship between the impact force of the hammer and the strength of the pre-detected concrete piece can be obtained, so that the strength limit of the pre-detected concrete piece can be accurately obtained; through the mutual cooperation of the above-mentioned features, the concrete strength detection equipment for civil engineering quality detection can effectively solve the problem that the strength limit of the sample cannot be accurately detected when the strength of the concrete sample is detected by impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0022] Figure 1 A partial schematic diagram of the gas chamber of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0023] Figure 2 A partial cross-sectional view of the air chamber of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a hammer bullet of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0025] Figure 4 A cross-sectional view of a hammer bullet of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the use of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0028] Figure 7 A partial cross-sectional view of a crossbeam of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0029] Figure 8 A schematic top view of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0030] Fig. 9 A schematic top view of a material pressing frame of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention;

[0031] Fig.10 A partially enlarged schematic diagram of a leveling mechanism of a concrete strength testing device for civil engineering quality testing provided by an embodiment of the present invention.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] 10-air chamber; 101-buffer layer; 11-exhaust pipe; 111-limit edge; 112-buffer ring; 12-opening and closing member; 13-boosting piston; 14-boosting cylinder; 15-support positioning plate; 151-through hole; 152-elastic layer; 20-hammer; 21-limit plate; 22-recoil slideway; 23-air hole; 24-slide hole; 241-plate groove; 25-distance scale line; 30-recoil member; 40-slider pointer; 41 -sealing plate; 50-working table; 51-upright column; 511-first spring; 512-second spring; 52-top plate; 521-first fixing piece; 522-transverse scale line; 53-crossbeam; 531-second fixing piece; 532-longitudinal scale line; 54-slider; 541-third fixing piece; 60-pressing frame; 61-transverse pressure strip; 62-longitudinal pressure strip; 63-cylinder; 64-hinged seat; 65-pressing head; 66-support rod. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0035] Please refer to Figures 1 to 4 The embodiment of the present invention provides a concrete strength testing device for quality inspection of civil engineering projects, comprising: a gas chamber 10, wherein the gas chamber 10 is provided with an exhaust pipe 11, wherein the inner end of the exhaust pipe 11 is provided with an opening and closing member 12, wherein the opening and closing member 12 can open or close the exhaust pipe 11, wherein the gas chamber 10 is provided with a pressurizing mechanism, wherein the pressurizing mechanism can increase the internal pressure of the gas chamber 10; a second part comprising a hammer bullet 20, wherein the hammer bullet 20 is slidably mounted on the exhaust pipe 11, wherein the hammer bullet 20 is used to impact a pre-detected concrete member, so as to characterize the strength of the pre-detected concrete member by the impact force during crushing; a third part comprising a recoil member 30, wherein the recoil member 30 is convexly arranged at the impact end of the hammer bullet 20, and is slidably matched with the hammer bullet 20 along the axial direction of the hammer bullet 20; and a fourth part comprising a distance measuring mechanism, wherein the distance measuring mechanism is used to detect the relative displacement between the recoil member 30 and the hammer bullet 20, so as to characterize the impact force of the hammer bullet 20.

[0036] The present invention provides a concrete strength testing device for quality inspection of civil construction projects. The device comprises a gas chamber 10 and a pressurizing mechanism, an exhaust pipe 11 is arranged in the gas chamber 10, an opening and closing member 12 is arranged in the exhaust pipe 11, the exhaust pipe 11 is first closed by the opening and closing member 12 to make the gas chamber 10 airtight, and then the internal pressure of the gas chamber 10 is increased by the pressurizing mechanism. When the internal pressure reaches a preset value, the exhaust pipe 11 is opened by the opening and closing member 12 to make the high-pressure gas in the gas chamber 10 quickly penetrate into the exhaust pipe 11, thereby increasing the air pressure in the exhaust pipe 11 instantly. On this basis, a hammer bullet 20 is slidably arranged in the exhaust pipe 11. When the air pressure in the exhaust pipe 11 increases instantly, the hammer bullet 20 is quickly pushed to slide along the exhaust pipe 11, thereby colliding with the pre-detected concrete member, so as to achieve the purpose of performing concrete sample strength inspection by means of impact. On this basis, a recoil member 30 is arranged. Before the hammer bullet 20 is about to collide with the pre-detected concrete member, the recoil member 30 first contacts the pre-detected concrete piece, and then under the impact of the hammer bullet 20, according to the reaction force, the recoil piece 30 will recoil along the axial direction of the hammer bullet 20 and move away from the pre-detected concrete piece; on this basis, by setting a distance measuring mechanism, the recoil piece 30 and the hammer bullet 20 are detected by the distance measuring mechanism, and the recoil distance of the recoil piece 30 can be obtained; since the recoil distance is related to the impact force of the hammer bullet 20, and the impact force of the hammer bullet 20 can be related to the strength of the pre-detected concrete piece, therefore, the relative displacement accurately collected by the distance measuring mechanism is used for fitting, and the functional relationship between the impact force of the hammer bullet 20 and the strength of the pre-detected concrete piece can be obtained, so that the strength limit of the pre-detected concrete piece can be accurately obtained; through the mutual cooperation of the above-mentioned features, the concrete strength detection equipment for civil engineering quality detection can effectively solve the problem that the strength limit of the sample cannot be accurately detected when the strength of the concrete sample is detected by impact.

[0037] It should be noted that the gas chamber 10 is provided with a pressure gauge for real-time monitoring of its internal pressure.

[0038] It should be noted that the above-mentioned opening and closing member 12 can adopt any structure in the prior art that can switch between open and closed, such as any valve, such as a pressure valve, such as an iris structure, such as a baffle (moving laterally along the plane where the baffle is located), as long as the exhaust pipe 11 can be quickly switched between open and closed.

[0039] Please refer to further Figure 2In order to further explain the specific structure of the boosting mechanism, the boosting mechanism includes a boosting piston 13 and a boosting cylinder 14, and the boosting piston 13 is slidably and tightly arranged in the gas bin 10; the boosting cylinder 14 is fixed to the gas bin 10, and the push rod of the boosting cylinder 14 is connected to the boosting piston 13; the inner wall of the gas bin 10 on one side connected to the exhaust pipe 11 is paved with a buffer layer 101, and the buffer layer 101 is used to contact and squeeze the boosting piston 13.

[0040] It should be noted that an air inlet hole is provided on a side of the air chamber 10 away from the exhaust pipe 11 to ensure that the booster piston 13 can move normally.

[0041] Please refer to further Figures 2 to 4 In order to further explain the specific connection relationship between the hammer bullet 20 and the exhaust pipe 11, the exhaust pipe 11 is a hard pipe; the outer end of the exhaust pipe 11 extends radially inward to form a limit edge 111, and the inner surface of the limit edge 111 is paved with a buffer ring 112; the outer diameter of the hammer bullet 20 matches the inner diameter of the limit edge 111, and the tail end of the hammer bullet 20 extends outward to form a limit plate 21, and the outer diameter of the limit plate 21 matches the inner diameter of the exhaust pipe 11; The bullet 20 is hollow to form a recoil slide 22, and the diameter of the recoil slide 22 matches the diameter of the recoil member 30; a plurality of air holes 23 are opened on the side wall of the tail of the hammer bullet 20, and the air holes 23 are all connected to the recoil slide 22; when the limit plate 21 is flush with the inner end of the exhaust pipe 11, all the air holes 23 are located inside the exhaust pipe 11; when the limit plate 21 is in contact with the buffer ring 112, all the air holes 23 are located outside the exhaust pipe 11.

[0042] Through the above arrangement, on the one hand, by setting the limit edge 111, the buffer ring 112 and the limit plate 21, the hammer bullet 20 will not completely leave the exhaust pipe 11; on the other hand, by setting the recoil slide 22 and the air hole 23, when the opening and closing member 12 is opened, the high-pressure gas flows into the exhaust pipe 11, but the exhaust pipe 11 is closed by the hammer bullet 20 at this time, so the air flow will rush into the recoil slide 22 through the air hole 23, thereby forcing the recoil member 30 to move to the impact end of the hammer bullet 20 to achieve recoil. The member 30 is reset to ensure that it is located at the initial position before the impact, so as to ensure the accuracy of the distance measurement mechanism; by further limiting the position of the air holes 23, when the limit plate 21 contacts the buffer ring 112, all the air holes 23 are located outside the exhaust pipe 11, so as to avoid that when the recoil member 30 recoils, the internal pressure of the hammer bullet 20 increases due to the recoil of the recoil member 30, and the excess high-pressure gas will be quickly discharged to the external environment through the air holes 23 first, which will not cause a significant impact on the recoil of the recoil member 30.

[0043] Please refer to further Figure 3 and Figure 4 In order to further explain the specific structure of the distance measuring mechanism, the distance measuring mechanism includes a slider pointer 40 and a sealing plate 41; a sliding hole 24 is axially opened on the side wall of the impact end of the hammer bullet 20, the inner side of the sliding hole 24 is connected to the recoil slideway 22, and the sliding hole 24 is provided with a distance measuring scale line 25 along the length direction; the slider pointer 40 is connected to the side wall of the recoil member 30 and is located in the middle of the recoil member 30, the slider pointer 40 is slidably matched with the sliding hole 24, and the slider pointer 40 can point to the distance measuring scale line 25; the sealing plate 41 is connected to the slider pointer 40, and the sealing plate 41 is used to close the portion of the sliding hole 24 located between the slider pointer 40 and one end of the sliding hole 24 away from the impact end of the hammer bullet 20.

[0044] Through the above arrangement, when the recoil member 30 recoils, it pushes the slider pointer 40 to move along the slide hole 24, and at the same time, the slider pointer 40 drives the sealing plate 41 to move synchronously, so that the part of the slide hole 24 located between the slider pointer 40 and the end of the slide hole 24 away from the impact end of the hammer bullet 20 is always in a closed state, and cooperates with the sealing effect of the hammer bullet 20, so that the gas in the exhaust pipe 11 will not be discharged outward through the slide hole 24, so as to ensure the pushing effect of the high pressure on the hammer bullet 20.

[0045] Please refer to further Figure 3 and Figure 4 In order to further improve the sealing effect of the sealing plate 41, a plate groove 241 is opened on the hole wall in the width direction of the sliding hole 24, and the plate groove 241 extends in the direction toward the tail end of the hammer bullet 20 and is connected with at least one of the air holes 23; the sealing plate 41 is slidably matched with the plate groove 241; when the slider pointer 40 is located at the end of the sliding hole 24 close to the impact end of the hammer bullet 20, the sealing plate 41 completely closes the sliding hole 24; when the slider pointer 40 is located at the end of the sliding hole 24 away from the impact end of the hammer bullet 20, the sliding hole 24 is completely open.

[0046] Through the above arrangement, the sealing effect is further improved by utilizing the cooperation between the plate groove 241 and the sealing plate 41 ; and the plate groove 241 is arranged to be in communication with at least one air hole 23 to prevent the internal pressure in the plate groove 241 from increasing.

[0047] Please refer to further Figure 1In order to ensure that the stroke of the hammer 20 is the same each time it strikes, a support and positioning plate 15 is provided on one side of the gas chamber 10 provided with the exhaust pipe 11. The support and positioning plate 15 is used to contact and squeeze the surface of the pre-detected concrete member. The support and positioning plate 15 is arranged perpendicular to the axial direction of the exhaust pipe 11. A through hole 151 is opened in the middle of the support and positioning plate 15. The through hole 151 is coaxially arranged with the exhaust pipe 11, and the aperture of the through hole 151 is larger than the outer diameter of the hammer 20. An elastic layer 152 is laid on the side of the support and positioning plate 15 away from the gas chamber 10. When the limit plate 21 contacts the buffer ring 112, the impact end of the hammer 20 passes over the elastic layer 152 and strikes the surface of the pre-detected concrete member.

[0048] Please refer to Figures 5 to 9 In order to further improve the practicality, the concrete strength testing equipment for civil engineering quality inspection also includes a frame, which includes a workbench 50, a plurality of columns 51 and a top plate 52; the top surface of the workbench 50 is horizontal, and is used to place and support the pre-inspected concrete pieces, and the columns 51 are vertically arranged on the top surface of the workbench 50; the top plate 52 is horizontally arranged, and is slidably matched with all the columns 51, and is provided with a first fixing member 521, and the first fixing member 521 is used to fix the top plate 52 relative to the columns 51; the top plate 52 is horizontally slidably connected to a crossbeam 53, and the sliding direction is the same as that of the crossbeam 53 The cross beam 53 is parallel to the width direction and is provided with a second fixing member 531, which is used to fix the cross beam 53 relatively to the top plate 52; the cross beam 53 is slidably connected with a slider 54 along the length direction and is provided with a third fixing member 541, which is used to fix the slider 54 relatively to the cross beam 53; the gas chamber 10 is fixedly connected to the slider 54 so that the exhaust pipe 11 is vertically downward; the top plate 52 is provided with horizontal scale lines 522 for determining the displacement of the cross beam 53; the cross beam 53 is provided with vertical scale lines 532 for determining the displacement of the slider 54.

[0049] Through the above arrangement, the air chamber 10 can be displaced in the horizontal, longitudinal and vertical directions relative to the pre-detected concrete member, so that it can detect any point of the pre-detected concrete member.

[0050] Please refer to further Figures 5 to 9In order to fix the pre-test concrete parts and prevent them from unnecessary displacement or shaking during the testing process, the concrete strength testing equipment for civil engineering quality testing also includes a pressing frame 60, which is horizontally arranged between the top plate 52 and the workbench 50, and slidably cooperates with all the columns 51; the part of the column 51 located between the workbench 50 and the pressing frame 60 is provided with a first spring 511; the part of the column 51 located between the pressing frame 60 and the top plate 52 is provided with a second spring 512; when the first spring 511 and the second spring 512 are both in a natural state, the pressing frame 60 and the top plate 52 are both suspended; when the top plate 52 is pressed down until the elastic layer 152 contacts and squeezes the surface of the pre-test concrete part, the pressing frame 60 also contacts and squeezes the surface of the pre-test concrete part.

[0051] With the above arrangement, when in use, the horizontal, transverse and longitudinal positions of the air bin 10 are adjusted and fixed, and then the top plate 52 is pressed down until the elastic layer 152 contacts and squeezes the surface of the pre-inspected concrete member. During the process, the top plate 52 squeezes the second spring 512, and then the second spring 512 squeezes the pressing frame 60, and the pressing frame 60 squeezes the first spring 511 and contacts and squeezes the surface of the pre-inspected concrete member, thereby squeezing and fixing the pre-inspected concrete member through the pressing frame 60; after the inspection is completed, the first fixing member 521 is opened, and the top plate 52 and the pressing frame 60 can be reset under the rebound action of the first spring 511 and the second spring 512.

[0052] Please refer to further Figures 5 to 9 In order to make the pressing frame 60 adapt to pre-inspected concrete pieces of different widths, the pressing frame 60 is a rectangular frame; a pair of transverse pressure bars 61 and a pair of longitudinal pressure bars 62 are provided in the pressing frame 60, the transverse pressure bars 61 are parallel to the cross beam 53, and the longitudinal pressure bars 62 are perpendicular to the cross beam 53; the transverse pressure bars 61 are fixedly connected to the inner wall of the pressing frame 60; the longitudinal pressure bars 62 are slidably connected to the inner wall of the pressing frame 60 through a cylinder 63.

[0053] Through the above arrangement, the distance between the longitudinal pressing strips 62 can be adjusted to adapt to the width of the pre-tested concrete member.

[0054] Please refer to further Figures 5 to 10Since the surface of the pre-detection concrete member is generally not flat, the pre-detection concrete member is directly squeezed by the transverse pressure strip 61 and the longitudinal pressure strip 62. The stress conditions of the various parts of the transverse pressure strip 61 and the longitudinal pressure strip 62 are different, which may easily cause the two to bend or deform, and it is difficult to keep the two always level. The bottom surfaces of the transverse pressure strip 61 and the longitudinal pressure strip 62 are provided with a leveling mechanism, and the leveling mechanism includes a plurality of hinged seats 64, a plurality of pressure heads 65 and a plurality of support rods 66; two hinged seats 64 are fixedly provided at both ends of the bottom surfaces of the transverse pressure strip 61 and the longitudinal pressure strip 62, and the other hinged seats 64 are slidably arranged on the transverse pressure strip 61 or the longitudinal pressure strip 62 along the length direction; a pressure head 65 is provided between two adjacent hinged seats 64, and the two hinged seats 64 are respectively hinged with the corresponding pressure head 65 through a support rod 66; the pressure head 65 is used to contact and squeeze the top surface of the pre-detection concrete member.

[0055] By setting up a leveling mechanism, when pressing down, the pressure head 65 first contacts and squeezes the surface of the pre-detected concrete member. Since the surface of the pre-detected concrete member is uneven, the height of the pressure head 65 is different, so the hinge seat 64 is driven to slide through the linkage between the support rods 66 until it reaches the optimal position, which can ensure that the horizontal pressure strip 61 and the vertical pressure strip 62 are in a horizontal state.

[0056] It should be noted that, in this embodiment, the first fixing member 521 , the second fixing member 531 , and the third fixing member 541 are all screws with knobs.

[0057] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A concrete strength testing device for civil engineering quality testing, characterized in that: include: An air bin (10), the air bin (10) being provided with an exhaust pipe (11), an opening and closing member (12) being provided at the inner end of the exhaust pipe (11), the opening and closing member (12) being capable of opening or closing the exhaust pipe (11), the air bin (10) being provided with a pressurizing mechanism, the pressurizing mechanism being capable of increasing the internal pressure of the air bin (10); A hammer bullet (20), the hammer bullet (20) being slidably mounted on the exhaust pipe (11), the hammer bullet (20) being used to impact the pre-test concrete piece, so as to characterize the strength of the pre-test concrete piece through the impact force when it is crushed; A recoil member (30), the recoil member (30) being protruding from the impact end of the hammer bullet (20) and being slidably matched with the hammer bullet (20) along the axial direction of the hammer bullet (20); A distance measuring mechanism, the distance measuring mechanism being used to detect the relative displacement between the recoil member (30) and the hammer bullet (20) so as to characterize the impact force of the hammer bullet (20); The exhaust pipe (11) is a hard pipe; The outer end of the exhaust pipe (11) extends radially inward to form a limiting edge (111), and a buffer ring (112) is provided on the inner surface of the limiting edge (111); The outer diameter of the hammer bullet (20) matches the inner diameter of the limiting edge (111); the tail end of the hammer bullet (20) extends outward to form a limiting plate (21); and the outer diameter of the limiting plate (21) matches the inner diameter of the exhaust pipe (11); The hammer bullet (20) is hollow to form a recoil slideway (22), and the diameter of the recoil slideway (22) matches the diameter of the recoil member (30); A plurality of air holes (23) are formed on the side wall of the tail of the hammer bullet (20), and the air holes (23) are all connected to the recoil slideway (22); When the limiting plate (21) is flush with the inner end of the exhaust pipe (11), all of the air holes (23) are located inside the exhaust pipe (11); When the limiting plate (21) is in contact with the buffer ring (112), all of the air holes (23) are located outside the exhaust pipe (11).

2. The concrete strength testing equipment for civil engineering quality testing according to claim 1 is characterized in that: The boosting mechanism comprises a boosting piston (13) and a boosting oil cylinder (14); the boosting piston (13) is slidably and hermetically arranged in the gas bin (10); the boosting oil cylinder (14) is fixed to the gas bin (10), and a push rod of the boosting oil cylinder (14) is connected to the boosting piston (13); A buffer layer (101) is provided on the inner wall of the gas chamber (10) on the side connected to the exhaust pipe (11), and the buffer layer (101) is used to contact and squeeze the booster piston (13).

3. The concrete strength testing equipment for civil engineering quality testing according to claim 1 is characterized in that: The distance measuring mechanism comprises a slider pointer (40) and a sealing plate (41); A sliding hole (24) is formed in the axial direction on the side wall of the impact end of the hammer bullet (20); the inner side of the sliding hole (24) is connected to the recoil slideway (22); and the sliding hole (24) is provided with distance measuring scale lines (25) along the length direction; The slider pointer (40) is connected to the side wall of the recoil component (30) and is located in the middle of the recoil component (30). The slider pointer (40) is slidably matched with the slide hole (24). The slider pointer (40) can point to the distance measuring scale line (25). The sealing plate (41) is connected to the slider pointer (40), and the sealing plate (41) is used to seal the portion of the sliding hole (24) located between the slider pointer (40) and an end of the sliding hole (24) away from the impact end of the hammer bullet (20).

4. The concrete strength testing equipment for civil engineering quality testing according to claim 3 is characterized in that: A plate groove (241) is formed on the hole wall in the width direction of the sliding hole (24), wherein the plate groove (241) extends in a direction toward the tail end of the hammer bullet (20) and is in communication with at least one of the air holes (23); The sealing plate (41) is slidably matched with the plate groove (241); When the slider pointer (40) is located at an end of the slide hole (24) close to the impact end of the hammer bullet (20), the sealing plate (41) completely closes the slide hole (24); When the slider pointer (40) is located at an end of the slide hole (24) away from the impact end of the hammer bullet (20), the slide hole (24) is completely open.

5. The concrete strength testing equipment for civil engineering quality testing according to claim 3 or 4, characterized in that: A support and positioning plate (15) is provided on one side of the gas chamber (10) on which the exhaust pipe (11) is provided. The support and positioning plate (15) is used to contact and press the surface of the pre-detected concrete member. The support and positioning plate (15) is arranged perpendicular to the axial direction of the exhaust pipe (11). A through hole (151) is formed in the middle of the support and positioning plate (15). The through hole (151) is coaxially arranged with the exhaust pipe (11). The diameter of the through hole (151) is larger than the outer diameter of the hammer bullet (20); An elastic layer (152) is provided on a side of the supporting and positioning plate (15) away from the gas chamber (10); When the limiting plate (21) contacts the buffer ring (112), the impact end of the hammer bullet (20) passes over the elastic layer (152) and impacts the surface of the pre-detected concrete piece.

6. The concrete strength testing equipment for civil engineering quality testing according to claim 5 is characterized in that: It also includes a frame, the frame including a workbench (50), a plurality of columns (51) and a top plate (52); The top surface of the workbench (50) is horizontal and is used to place and support pre-tested concrete pieces, and the upright column (51) is vertically arranged on the top surface of the workbench (50); The top plate (52) is arranged horizontally and slidably cooperates with all the upright posts (51), and is provided with a first fixing member (521), wherein the first fixing member (521) is used to relatively fix the top plate (52) and the upright posts (51); The top plate (52) is horizontally slidably connected to a cross beam (53), and the sliding direction is parallel to the width direction of the cross beam (53), and is provided with a second fixing member (531), wherein the second fixing member (531) is used to relatively fix the cross beam (53) and the top plate (52); The crossbeam (53) is slidably connected to a slider (54) along the length direction and is provided with a third fixing member (541), wherein the third fixing member (541) is used to relatively fix the slider (54) and the crossbeam (53); The gas chamber (10) is fixedly connected to the slider (54) so ​​that the exhaust pipe (11) is vertically downward; The top plate (52) is provided with transverse scale lines (522) for determining the displacement of the crossbeam (53); the crossbeam (53) is provided with longitudinal scale lines (532) for determining the displacement of the slider (54).

7. The concrete strength testing equipment for civil engineering quality testing according to claim 6 is characterized in that: It also includes a material pressing frame (60), which is horizontally arranged between the top plate (52) and the workbench (50) and slidably cooperates with all the columns (51); A portion of the column (51) located between the workbench (50) and the press frame (60) is sleeved with a first spring (511); A second spring (512) is sleeved on a portion of the upright column (51) located between the pressing frame (60) and the top plate (52); When the first spring (511) and the second spring (512) are both in a natural state, the pressing frame (60) and the top plate (52) are both suspended in the air; When the top plate (52) is pressed down until the elastic layer (152) contacts and presses the surface of the pre-detected concrete piece, the pressing frame (60) also contacts and presses the surface of the pre-detected concrete piece.

8. The concrete strength testing equipment for civil engineering and construction quality testing according to claim 7 is characterized in that: The pressing frame (60) is a rectangular frame; A pair of transverse pressing strips (61) and a pair of longitudinal pressing strips (62) are provided in the pressing frame (60), wherein the transverse pressing strips (61) are parallel to the crossbeam (53), and the longitudinal pressing strips (62) are perpendicular to the crossbeam (53); The transverse pressing strip (61) is fixedly connected to the inner wall of the pressing frame (60); The longitudinal pressing strip (62) is slidably connected to the inner wall of the pressing frame (60) via a cylinder (63).

9. The concrete strength testing equipment for civil engineering and construction quality testing according to claim 8 is characterized in that: The bottom surfaces of the transverse pressure strip (61) and the longitudinal pressure strip (62) are both provided with a leveling mechanism, the leveling mechanism comprising a plurality of hinged seats (64), a plurality of pressure heads (65) and a plurality of support rods (66); Two hinge seats (64) are fixedly provided at both ends of the bottom surface of the transverse pressure strip (61) and the longitudinal pressure strip (62), respectively, and the other hinge seats (64) are slidably provided on the transverse pressure strip (61) or the longitudinal pressure strip (62) along the length direction; A pressure head (65) is provided between two adjacent hinged seats (64), and the two hinged seats (64) are respectively hinged to the corresponding pressure head (65) via a support rod (66); The pressure head (65) is used to contact and press the top surface of the pre-tested concrete member.

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