CN211013579U - Portable concrete surface layer accurate grinding and sampling equipment - Google Patents
Portable concrete surface layer accurate grinding and sampling equipment Download PDFInfo
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- CN211013579U CN211013579U CN201921606651.XU CN201921606651U CN211013579U CN 211013579 U CN211013579 U CN 211013579U CN 201921606651 U CN201921606651 U CN 201921606651U CN 211013579 U CN211013579 U CN 211013579U
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Abstract
The utility model discloses a portable concrete surface layer accurate grinding and sampling device, which belongs to the field of concrete durability monitoring.A grinding head and a drill bit are sequentially arranged in a sampling mechanism from front to back, the grinding head and the drill bit are connected into an integral structure, and the drill bit is connected with a motor rotating shaft through a drill bit mounting seat; the threaded cylinder of the precise adjusting mechanism is arranged at the outer side part of the drill bit mounting seat, the inner wall of the fixed ruler is provided with an internal thread matched with the threaded cylinder, and the fixed ruler and the threaded cylinder relatively rotate to adjust the relative depth of the grinding head embedded into the sampling layer; the two ends of a sliding rail of the collecting mechanism are fixedly connected with the drill bit mounting seat, and the powder collecting tank is movably sleeved on the sliding rail and covers the grinding head therein. It has solved current concrete powder sampling equipment portable not, and sampling process operation is complicated, unable accurate control sample demand, and the sampling in-process dust pollutes the scheduling problem, has sample accuracy, easy operation, convenient to carry's characteristics. The sampling device can be used for outdoor in-situ sampling and can also be used for indoor sampling.
Description
Technical Field
The utility model belongs to the technical field of concrete sampling equipment, concretely relates to accurate crocus sampling equipment in portable concrete top layer.
Background
Since concrete is a porous, hydrophilic material, it is easily penetrated by moisture. Harmful substances in the external environment, such as chloride ions, sulfate and carbon dioxide, enter the concrete by taking water as a medium. Harmful substances in the external environment change the microenvironment in the concrete to influence the steel bar passive film or directly accelerate the corrosion of the steel bars, so that the durability of the concrete is reduced, and the service life of the concrete cannot reach the designed service life. At present, building structures at home and abroad face a serious durability problem, and huge economic loss is caused. From the end of the 20 th 70 s, the existing infrastructure in developed countries has gradually developed a phenomenon of premature deterioration. For example, the total concrete value is 6 trillion dollars in the 90 s of the united states, and the maintenance and reconstruction costs are as much as 3 billion dollars per year. According to statistics, the harbor project built in China before 90 years generally has serious steel bar corrosion after 10-20 years of use. In recent years, even if some newly constructed harbor wharfs are subjected to durability measures, severe corrosion of steel bars occurs in less than 10 years of service. The detection of the permeation condition of the external harmful substances on the concrete surface layer can effectively evaluate and predict the durability condition of the concrete, so that corresponding protective measures are taken. For existing buildings and structures, sensors cannot be embedded, and therefore durability testing of existing buildings and structures is typically a sampling test. The test modes and methods of chloride ions, sulfate and carbon dioxide are relatively mature, but basically require powder samples, and the general flow comprises the following steps: drilling and sampling on site, grinding test blocks and testing related components.
The conventional concrete powder sampling equipment is well designed in precision and operation, but the equipment is heavy and difficult to transport if more samples are available. For example, the patent < method and apparatus for obtaining a concrete deterioration detection layered sample > including a machine tool, a grinding tool, a jig, and a powder collecting apparatus, is not suitable for an outdoor environment work, and is strict in the size and shape of a test block.
The patent < a handheld high accuracy concrete bores whitewashed sampling device and sampling method > through its outdoor sampling of method, need to install supporting clamping device, to the sampling position that is not fit for installing the clamping tool, the device is inconvenient to use. And the device can not collect the powder, and the process of drilling is blown up, is harmful to operating personnel health. And is not suitable for outdoor environment operation with large wind power. Therefore, how to develop a portable concrete surface layer accurate grinding and sampling device has important practical significance.
SUMMERY OF THE UTILITY MODEL
To the technical problem that the equipment that exists is heavy and can't realize the accurate control sample volume demand among the prior art, the utility model aims to provide an accurate crocus sampling device in portable concrete top layer.
The utility model discloses the technical scheme who takes does:
a portable concrete surface layer accurate grinding and sampling device comprises a sampling mechanism, an accurate adjusting mechanism and a collecting mechanism,
the sampling mechanism is sequentially provided with a grinding head and a drill bit from front to back, the grinding head and the drill bit are connected into an integrated structure, and the drill bit is connected with a motor rotating shaft through a drill bit mounting seat;
the precise adjusting mechanism comprises a threaded cylinder and a fixed ruler, the threaded cylinder is arranged at the outer side part of the drill bit mounting seat, the inner wall of the fixed ruler is provided with an internal thread matched with the threaded cylinder, and the fixed ruler and the threaded cylinder relatively rotate to adjust the relative depth of the grinding head embedded into the sampling layer;
the collecting mechanism comprises a powder collecting tank and a slide rail, two ends of the slide rail are fixedly connected with the drill bit mounting seat, and the powder collecting tank is movably sleeved on the slide rail and covers the grinding head therein.
Further, a threaded cylinder and a fixed ruler are both arranged to be of a cylindrical cylinder structure, and the outer side wall of the threaded cylinder and the inner side wall of the fixed ruler are respectively provided with an external thread and an internal thread.
Further, the distance between the threads on the threaded cylinder and the fixed ruler is 0.5mm, the total length of the threaded cylinder and the fixed ruler is 30mm, the fixed ruler and the threaded cylinder rotate relatively, and the grinding head advances by 0.5mm every rotation.
The feeding amount of each grinding is controlled to be below 0.5mm, accurate data are provided for researching the concentration and gradient of corrosive media entering concrete, human errors caused by cutting of slices are avoided, and the problem of complex specific operation is solved.
The utility model discloses a screw thread section of thick bamboo and fixed ruler mutually cooperate accurate control concrete sampling depth, can realize the sample of high accuracy, and the error design is less than 10 mu m, knows the deep situation of sample through the scale precision system on the fixed ruler, and the accuracy is high; the top layer powder after the sample is in time collected through the powder collecting vat, can avoid the interference between the sample layer, and the repeatability is good.
Further, the bistrique sets up to fretwork diamond bistrique, and the bistrique sets up to interior annular grinding tooth and outer annular grinding tooth and is the structure of arranging formation with one heart, and the central point of bistrique puts and has formed the arc fretwork hole I of 2 symmetries through dumbbell type grindstone interval, and the outside protrusion in center of dumbbell type grindstone extends and is provided with the toper pointed end, and round fretwork hole II has been seted up to the outside edge of interior annular grinding tooth, and adjacent fretwork hole II is the equidistant setting of arranging. The cooperation of the hollow holes I and the hollow holes II is convenient for being pushed to the interior of the sampling layer, and the special structure of the conical tip can reduce the frictional resistance between the sampling layer and the hollow holes I and II, so that the drilling rate is greatly improved.
Furthermore, the inner annular grinding teeth and the outer annular grinding teeth are respectively provided with arc-shaped racks with narrow inner parts and wide outer parts, the adjacent arc-shaped racks are arranged at equal intervals, and the tooth space of the inner annular grinding teeth is smaller than that of the outer annular grinding teeth.
The arc-shaped rack-shaped structure can generate shearing force in the criss-cross direction, so that the contact area in unit area can be effectively increased; interior annular grinding tooth and outer annular grinding tooth structural style of mutually supporting are favorable to overcoming frictional resistance when deepening the sample layer, and the sample reaches the requirement of sample volume fast.
Further, the powder collecting groove is arranged to be a hollow cavity structure matched with the grinding head, the powder collecting groove is movably mounted on the sliding rail, the lower end of the housing is connected with the powder collecting box through a pipeline, the powder collecting box is connected with the turbine, and powder is collected through wind pressure generated by the turbine.
The powder collecting box is a box with a hollow collecting cavity, and a drawer is arranged at the bottom of the powder collecting box.
Further, the powder collecting groove comprises a housing and a powder collecting bag, a collecting opening matched with the grinding head is formed in the left side of the upper portion of the housing, a funnel structure is arranged on the lower portion of the housing, and the powder collecting bag is located below the funnel and communicated with the funnel.
Furthermore, the powder collecting bag is of a hollow spherical structure made of rubber materials. The powder collecting bag has certain elastic effect, and can promote the rapid collection of powder by using the change of air pressure through pinching.
Further, the powder collecting groove moves about along the slide rail, and the displacement of powder collecting groove receives the fixed ruler restraint. The distance that the powder collecting vat removed along the slide rail is unanimous each other with the distance that the bistrique deepened the sample layer, can guarantee that the powder of sample collects the powder collecting vat completely, and simultaneously, the fixed ruler forms certain limiting displacement to its maximum displacement, can guarantee the maximum degree of depth of accurate positioning and control sample.
Furthermore, the grinding head is arranged in a detachable structure and is used for grinding and sampling when being installed; when removed, for drilling.
Furthermore, the tail end of the electric drill body is provided with a handheld handle, and an electric drill switch is arranged on the handheld handle. The handle is convenient to hold, and the sampling operation is convenient and quick by pressing the switch of the electric drill.
The utility model has the advantages that:
the utility model provides a sampling mechanism adopts the fretwork diamond bistrique, and the wearability is good, and structural design is novel, and it can go deep into the sampling layer surface fast and take a sample, and the atress is even and big with the area of contact on sampling layer, overcomes frictional resistance, can satisfy the demand that the sample volume is big.
The screw thread section of thick bamboo and the solid fixed ruler relative rotation of accurate adjustment mechanism, but accurate control concrete bores powder sample depth, can realize that the high accuracy interval gets the powder, and the error is little, and the two simple structure, processing convenient and fast, sample repeatability is good.
The powder collecting tank of the collecting mechanism is novel in structure, has double technical effects of collecting powder and preventing dust, ensures quick collection of sampled powder, and improves the environmental protection of a sampling environment; the grinding head is matched with the sliding rail, so that the displacement of the grinding head is consistent, and the operation error is small.
The portable test device has the advantages of compact integral structure, convenience in operation, capability of meeting the field test requirements of different projects, convenience in carrying, good environmental friendliness in the operation process and wide market application prospect.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a front view of the present invention;
fig. 3 is a schematic front structural view of the present invention;
FIG. 4 is a schematic view of the connection between the powder collecting box and the turbine according to the present invention;
FIG. 5 is a schematic structural view of a powder collecting tank with a powder collecting bag according to the present invention;
FIG. 6 is a schematic structural view of the hollow diamond grinding head of the present invention;
FIG. 7 is a front view of the middle hollow diamond grinding head of the present invention;
in the figure, 1, a grinding head; 2. a powder collecting tank; 2-1, a funnel; 2-2, a housing; 3. a drill bit; 4. a threaded barrel; 5. fixing a ruler; 6. a slide rail; 7. a powder collection bag; 8. a handle; 9. grinding the teeth in an inner ring shape; 10. an outer annular grinding tooth; 11. hollowing out the hole I; 12. a hollow hole II; 13. a dumbbell-shaped grindstone; 14. a powder collection box; 15. a turbine.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 5, a portable concrete surface layer accurate grinding and sampling device comprises a sampling mechanism, an accurate adjusting mechanism and a collecting mechanism,
the electric drill is a common chargeable industrial electric drill, and the grinding head is arranged at the free end part of the drill;
the accurate adjusting mechanism comprises a threaded cylinder and a fixed ruler, the threaded cylinder is arranged at the outer side part of the drill bit mounting seat, an inner thread matched with the threaded cylinder is arranged on the inner wall of the fixed ruler, the threaded cylinder and the fixed ruler are both arranged in a cylindrical barrel structure, an outer side wall of the threaded cylinder and an inner side wall of the fixed ruler are respectively provided with an outer thread and an inner thread, the thread distance between the threaded cylinder and the fixed ruler is 0.5mm, the total length is 30mm, the fixed ruler and the threaded cylinder rotate relatively, the grinding head advances by 0.5mm when each circle of rotation, and the fixed ruler and the threaded cylinder rotate relatively to adjust the relative depth of the grinding head embedded into the sampling layer;
the collecting mechanism comprises a powder collecting tank and a sliding rail, the two ends of the sliding rail are fixedly connected with the drill bit mounting seat, the two ends of the sliding rail are connected with the drill bit mounting seat in a welding mode, the powder collecting tank is movably sleeved on the sliding rail, and a grinding head is covered in the sliding rail.
The powder collecting tank is arranged to be a hollow cavity structure matched with the grinding head and movably mounted on the sliding rail, the lower end of the housing is connected with the powder collecting box through a pipeline, the powder collecting box is connected with the turbine, and powder is collected through wind pressure generated by the turbine. The powder collecting box is a box with a hollow collecting cavity, and a drawer is arranged at the bottom of the powder collecting box.
The tail end of the electric drill body is provided with a handheld handle, and an electric drill switch is arranged on the handheld handle.
The specific test method is as follows:
the handle grips the handheld handle, selects the concrete sample face, aligns powder collecting vat and concrete face, transfers the fixed scale to the leftmost end simultaneously, and the diamond bistrique is hugged closely with the concrete sample face this moment. The fixed ruler is rotated to enable the fixed ruler to retreat for a certain distance, and then the diamond grinding head is allowed to advance for the same distance. Open the power, the electric drill switch on the handheld handle is opened, it is rotatory that the rotatory electric drill that drives of motor shaft, the electric drill drives the diamond bistrique rotatory, it advances to the sample layer to advance with the hand propulsion diamond bistrique in step, in this moment, the powder collecting vat moves right along the slide rail, the collection mouth of the housing of powder collecting vat is hugged closely each other with the sample face all the time, the turbine operation, the powder is collected to the wind pressure that produces through the turbine, the powder through the bistrique sample promptly gets into in the powder collecting box along the pipeline, when the powder is collected and is accomplished, open the drawer, the powder.
The utility model provides an accurate crocus sampling equipment in portable concrete top layer has solved current concrete powder sampling equipment and has not been portable, and sampling process operation is complicated, unable accurate control sample demand scheduling problem, the utility model relates to an accurate crocus sampling equipment in concrete top layer has sample accuracy, easy operation, convenient to carry's characteristics. The sampling device can be used for outdoor in-situ sampling and can also be used for indoor sampling.
Example 2
On the basis of embodiment 1, different from embodiment 1, as shown in fig. 6 and 7, the grinding head is a hollow diamond grinding head, the hollow diamond grinding head is a detachable grinding head, and a hollow hole I is formed in the center of the grinding head, more specifically: 2 symmetrical arc-shaped hollow holes I are formed in the center of the grinding head at intervals through the dumbbell-shaped grinding stone, the center of the dumbbell-shaped grinding stone protrudes outwards and extends to form a conical tip, a circle of hollow holes II is formed in the edge of the outer side of the inner annular grinding tooth, the center of the dumbbell-shaped grinding stone protrudes outwards and extends to form a conical tip, the hollow diamond grinding head is arranged in a structure formed by concentric arrangement of the inner annular grinding tooth and the outer annular grinding tooth, and the radius of the outer annular grinding tooth is 20-30 mm; the cooperation of the hollow holes I and the hollow holes II is convenient for being pushed to the interior of the sampling layer, and the special structure of the conical tip can reduce the frictional resistance between the sampling layer and the hollow holes I and II, so that the drilling rate is greatly improved.
The inner annular grinding teeth and the outer annular grinding teeth are arc-shaped racks with narrow inner parts and wide outer parts, adjacent arc-shaped racks are arranged at equal intervals, and the tooth space of the inner annular grinding teeth is smaller than that of the outer annular grinding teeth.
In the common grinding head in the prior art, the surface of the grinding head is of a sand surface structure, and the grinding head and a sampling layer are sampled through friction and cannot penetrate into the sampling layer, so that the requirement of sampling quantity cannot be met; during actual operation, need detect the infiltration condition on the concrete top layer to external harmful substance, then the sample volume of bistrique is crucial, and the fretwork diamond bistrique is great with the area of contact on sample layer when can guaranteeing that the bistrique gos deep into the sample layer in this application, and has effectively avoided the too big problem that can't go deep into inside of resistance to and the too fast problem of friction heating.
Example 3
On the basis of embodiment 1, unlike embodiment 1, as shown in fig. 4, the grinding head is provided in a detachable structure, and the grinding head is removed from the end of the apparatus for drilling.
A portable drilling device comprises a drilling mechanism, a precise adjusting mechanism and a collecting mechanism,
the drilling mechanism is sequentially provided with an electric drill body and a handheld handle from front to back, the electric drill body comprises a drill bit and a drill bit mounting seat, and the drill bit is connected with a motor rotating shaft through the drill bit mounting seat; the tail end of the electric drill body is provided with a handheld handle, and an electric drill switch is arranged on the handheld handle.
The accurate adjusting mechanism comprises a threaded cylinder and a fixed ruler, the threaded cylinder is arranged at the outer side part of the drill bit mounting seat, the inner wall of the fixed ruler is provided with an internal thread matched with the threaded cylinder, the threaded cylinder and the fixed ruler are both arranged into a cylindrical barrel structure, the outer side wall of the threaded cylinder and the inner side wall of the fixed ruler are respectively provided with an external thread and an internal thread, the thread distance between the threaded cylinder and the fixed ruler is 0.5mm, the total length is 30mm, the fixed ruler and the threaded cylinder rotate relatively, the drill bit advances by 0.5mm every rotation, and the fixed ruler and the threaded cylinder rotate relatively to adjust the relative depth of the drill bit embedded into the drill hole layer;
the collecting mechanism comprises a powder collecting groove and a sliding rail, two ends of the sliding rail are fixedly connected with the drill bit mounting seat, and the powder collecting groove is movably sleeved on the sliding rail and covers the drill bit.
The powder collecting groove comprises a housing and a powder collecting bag, the left side of the upper portion of the housing is provided with a collecting port matched with the grinding head, the lower portion of the housing is of a funnel structure, and the powder collecting bag is located below the funnel and communicated with the funnel.
The powder collecting bag is of a hollow spherical structure prepared from rubber materials, the powder collecting tank moves left and right along the sliding rail, and the moving distance of the powder collecting tank is restricted by the fixed ruler.
The specific drilling method comprises the following steps:
the handle grips the handheld handle, selects the concrete sample face, aligns powder collecting vat and concrete face, transfers the fixed scale to the leftmost end simultaneously, and the drill bit tip is hugged closely with the concrete sample face this moment. The fixed ruler is rotated to enable the fixed ruler to retreat for a certain distance, and then the drill bit is allowed to advance for the same distance. Open the power, the electric drill switch on the handheld handle is opened, and it is rotatory that the electric drill is driven in the rotation of motor shaft, and the electric drill drives the drill bit rotatory, advances with the hand propulsion drill bit in step, gos deep into to the wall that punches in, and in this moment, the powder collecting vat moves right along the slide rail, and the collection mouth of the housing of powder collecting vat is hugged closely each other with the sample face all the time, and the dust through drilling is covered by the housing, in collecting the bag along the funnel whereabouts to the powder, has guaranteed drilling environment's.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A portable concrete surface layer accurate grinding and sampling device is characterized by comprising a sampling mechanism, an accurate adjusting mechanism and a collecting mechanism,
the sampling mechanism is sequentially provided with a grinding head and a drill bit from front to back, the grinding head and the drill bit are connected into an integrated structure, and the drill bit is connected with a motor rotating shaft through a drill bit mounting seat;
the precise adjusting mechanism comprises a threaded cylinder and a fixed ruler, the threaded cylinder is arranged at the outer side part of the drill bit mounting seat, the inner wall of the fixed ruler is provided with an internal thread matched with the threaded cylinder, and the fixed ruler and the threaded cylinder relatively rotate to adjust the relative depth of the grinding head embedded into the sampling layer;
the collecting mechanism comprises a powder collecting tank and a slide rail, two ends of the slide rail are fixedly connected with the drill bit mounting seat, and the powder collecting tank is movably sleeved on the slide rail and covers the grinding head therein.
2. The portable concrete surface layer accurate grinding and sampling device according to claim 1, wherein the threaded cylinder and the fixed ruler are both arranged in a cylindrical cylinder structure, and the outer side wall of the threaded cylinder and the inner side wall of the fixed ruler are respectively provided with an external thread and an internal thread.
3. The portable concrete surface precise grinding and sampling device as claimed in claim 1 or 2, wherein the distance between the screw thread on the screw thread cylinder and the screw thread on the fixed ruler is 0.5mm, the total length is 30mm, and the fixed ruler and the screw thread cylinder rotate relatively, and the grinding head advances 0.5mm per rotation.
4. The portable concrete surface layer accurate grinding and sampling device according to claim 1, wherein the grinding head is a hollowed-out diamond grinding head, the grinding head is arranged in a structure that inner annular grinding teeth and outer annular grinding teeth are concentrically arranged, 2 symmetrical arc-shaped hollowed-out holes I are formed in the central position of the grinding head at intervals through a dumbbell-shaped grinding stone, a conical tip is arranged at the center of the dumbbell-shaped grinding stone in a protruding and extending mode, and a circle of hollowed-out holes II is formed in the outer edge of each inner annular grinding tooth.
5. The portable concrete surface precise grinding and sampling device as claimed in claim 4, wherein the inner annular grinding teeth and the outer annular grinding teeth are provided as arc-shaped racks with narrow inside and wide outside, the adjacent arc-shaped racks are arranged at equal intervals, and the tooth space of the inner annular grinding teeth is smaller than that of the outer annular grinding teeth.
6. The portable concrete surface precise grinding and sampling device as claimed in claim 1, wherein the powder collecting tank is provided as a hollow cavity structure matched with the grinding head and movably mounted on a slide rail, the lower end of the housing is connected with the powder collecting box through a pipeline, the powder collecting box is connected with the turbine, and powder is collected through wind pressure generated by the turbine.
7. The portable concrete surface layer accurate grinding and sampling equipment as claimed in claim 1, wherein the powder collecting tank comprises a cover shell and a powder collecting bag, the left side of the upper part of the cover shell is provided with a collecting port matched with the grinding head, the lower part of the cover shell is provided with a funnel structure, and the powder collecting bag is positioned below the funnel and communicated with the funnel; the powder collecting bag is of a hollow spherical structure made of rubber materials.
8. The portable concrete surface precise grinding and sampling device as claimed in claim 6 or 7, wherein the powder collecting groove moves left and right along the sliding rail, and the moving distance of the powder collecting groove is restricted by the fixed ruler.
9. The portable concrete surface precise grinding and sampling device as recited in claim 1, wherein the grinding head is detachably provided, and when installed, is used for grinding and sampling; when removed, for drilling.
10. The portable concrete surface layer accurate grinding and sampling equipment as claimed in claim 1, wherein the drill bit and the drill bit mounting seat form an electric drill body, a handheld handle is arranged at the tail end of the electric drill body, and an electric drill switch is arranged on the handheld handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921606651.XU CN211013579U (en) | 2019-09-25 | 2019-09-25 | Portable concrete surface layer accurate grinding and sampling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921606651.XU CN211013579U (en) | 2019-09-25 | 2019-09-25 | Portable concrete surface layer accurate grinding and sampling equipment |
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| Publication Number | Publication Date |
|---|---|
| CN211013579U true CN211013579U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921606651.XU Expired - Fee Related CN211013579U (en) | 2019-09-25 | 2019-09-25 | Portable concrete surface layer accurate grinding and sampling equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN211013579U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579373A (en) * | 2019-09-25 | 2019-12-17 | 青岛理工大学 | portable concrete surface layer accurate grinding and sampling equipment |
| CN112985884A (en) * | 2021-02-04 | 2021-06-18 | 河南鼎畅路桥工程有限公司 | Road and bridge strength detection device |
-
2019
- 2019-09-25 CN CN201921606651.XU patent/CN211013579U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579373A (en) * | 2019-09-25 | 2019-12-17 | 青岛理工大学 | portable concrete surface layer accurate grinding and sampling equipment |
| CN112985884A (en) * | 2021-02-04 | 2021-06-18 | 河南鼎畅路桥工程有限公司 | Road and bridge strength detection device |
| CN112985884B (en) * | 2021-02-04 | 2023-02-28 | 河南鼎畅路桥工程有限公司 | Road and bridge strength detection device |
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Granted publication date: 20200714 Termination date: 20210925 |