CN110823725A - Pin type penetrometer suitable for concrete strength detection - Google Patents
Pin type penetrometer suitable for concrete strength detection Download PDFInfo
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- CN110823725A CN110823725A CN201910952711.1A CN201910952711A CN110823725A CN 110823725 A CN110823725 A CN 110823725A CN 201910952711 A CN201910952711 A CN 201910952711A CN 110823725 A CN110823725 A CN 110823725A
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- needle
- adjusting
- concrete strength
- accommodating cavity
- pressing shaft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0035—Spring
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to a needle type penetrometer which comprises a body, a handle, a hook hanging arm, a measuring needle, a pressing shaft, an elastic part, an adjusting part and an adjusting nut. The body is internally provided with a containing cavity and a through hole. The pressing shaft penetrates through the through hole, and a limiting step is arranged at the top end of the pressing shaft. The elastic piece is arranged in the accommodating cavity and elastically abuts against the upper plane of the limiting step. The handle drives the hook hanging arm to swing circumferentially so as to control the axial displacement motion of the pressing shaft. The measuring pin is fixed at the lower end of the pressing shaft. The adjusting piece comprises a pressing plate and an adjusting rod. The pressing plate is arranged in the accommodating cavity and always abuts against the elastic piece. The adjusting rod penetrates through the top wall of the accommodating cavity, and an external thread matched with the adjusting nut is arranged on the side wall of the penetrating part of the adjusting rod. In this way, an operator can rotate the adjusting nut according to specific detection requirements, so that the compressed amount of the elastic piece is conveniently and quickly changed, and the lower punching amount of the measuring needle is indirectly controlled.
Description
Technical Field
The invention relates to the technical field of building detection, in particular to a needle type penetrometer suitable for concrete strength detection.
Background
The mortar injection method is a main method for detecting the compressive strength of the masonry mortar, and plays an important role in building site detection. The mortar injection method is to inject a rigid measuring pin into concrete by accurately controlling power, and mainly comprises the following two steps: measuring nail penetration and depth. And (3) measuring nail injection, namely injecting the measuring nail into the measured masonry component by using a needle type injection instrument, leaving a measuring point on the masonry component, pulling out the measuring nail and leaving a measuring hole, determining injection resistance according to the measured depth value, and evaluating the forming quality of the concrete according to the determined injection resistance. In the actual operation process, the transmitting end of the needle type penetrometer is pressed on the side surface of the quilt, and meanwhile, the measuring needle is transmitted by utilizing the elastic force of the load spring, so that the impact kinetic energy is favorably penetrated into the concrete.
At present, needle penetrometers of various types and specifications are developed aiming at different application scenes, but the problems that the impact force of a measuring needle cannot be adjusted or the adjustment process is complicated exist, for example, as shown in fig. 1, a needle penetrometer of one specification can know that the movement stroke of a loaded spring in the needle penetrometer is always kept unchanged in the process of exciting the needle penetrometer for multiple times. Aiming at different application scenes, the needle type penetrometer needs to be disassembled to replace load springs with different rigidity coefficients, so that the measuring needle has a proper impact force value. Therefore, the impact force adjusting process of the measuring needle is extremely complicated, and the application range of the needle type penetrometer is greatly limited. In addition, a single adjustment process consumes a large amount of operation time, thereby greatly reducing the detection speed. Thus, a skilled person is urgently needed to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a needle type penetrometer which is simple in structural design and convenient for adjusting the impact force value of a measuring needle and is suitable for concrete strength detection.
In order to solve the technical problem, the invention relates to a needle type penetrometer suitable for concrete strength detection, which comprises a body, a handle, a hook arm, a measuring needle, a pressing shaft and an elastic piece. The body is internally provided with a containing cavity and a through hole. The through hole is arranged right below the accommodating cavity and is communicated with the accommodating cavity. The pressing shaft penetrates through the through hole, and a limiting step is arranged at the top end of the pressing shaft. The elastic piece is arranged in the accommodating cavity and elastically abuts against the upper plane of the limiting step. The handle articulates on the lateral wall of body, and drives the hook and hang the arm and carry out circumference swing in order to realize carrying out the control of axial displacement motion to the last item. The measuring needle is fixed at the lower end of the pressing shaft and moves downwards under the driving of the elastic force of the elastic piece. In addition, the needle type penetrometer suitable for concrete strength detection further comprises an adjusting piece and an adjusting nut. The adjusting piece comprises a pressing plate and an adjusting rod vertically connected with the pressing plate. The pressing plate is arranged in the accommodating cavity and always abuts against the elastic piece. The adjusting rod penetrates through the top wall of the accommodating cavity, and an external thread matched with the adjusting nut is arranged on the side wall of the penetrating part of the adjusting rod.
As a further improvement of the technical scheme of the invention, the outer diameter of the pressure plate is matched with the inner diameter of the accommodating cavity.
As a further improvement of the technical scheme of the invention, a plurality of graphite inlaid annular grooves are formed around the outer side wall of the pressure plate and the adjusting rod and are uniformly distributed along the axial direction of the adjusting piece.
As a further improvement of the technical scheme of the invention, the measuring needle and the pressing shaft are detachably connected through a thread pair.
As a further improvement of the technical scheme of the invention, the diameter of the measuring needle is controlled to be 3.5-5mm, and the measuring needle is provided with a conical striking end.
As a further improvement of the technical scheme of the invention, the elastic piece is a cylindrical spring or an elastic rubber sleeve.
As a further improvement of the technical scheme of the invention, the needle type penetrometer suitable for detecting the concrete strength further comprises a propping sleeve which is detachably fixed at the lower end part of the body and is provided with a through hole for the free passing of the measuring needle.
As a further improvement of the technical scheme of the invention, the lower end surface of the abutting sleeve is provided with a titanium nitride wear-resistant coating, and the thickness is controlled to be 2-2.5 mu m.
Of course, as another modification of the above technical solution, the abutting sleeve may also be made of cemented carbide.
Through adopting above-mentioned technical scheme to set up, operating personnel require the rotating adjusting nut according to concrete detection to make the regulating part carry out the displacement along its axial, changed the volume of being compressed of elastic component promptly, and then indirectly controlled the size of the momentum under the probe. Therefore, compared with a needle type penetrometer with a traditional design structure, the impact force value of the measuring needle can be adjusted more conveniently and rapidly, the time consumed by concrete strength testing is effectively shortened, and the detection efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a needle penetrometer suitable for concrete strength testing in the prior art.
FIG. 2 is a schematic structural diagram of a first embodiment of a needle penetrometer suitable for concrete strength testing according to the invention.
FIG. 3 is a schematic structural diagram of a second embodiment of a needle penetrometer suitable for concrete strength testing according to the invention.
FIG. 4 is a schematic structural diagram of a third embodiment of a needle penetrometer suitable for concrete strength testing according to the invention.
FIG. 5 is a perspective view of an adjusting member of the needle penetrometer suitable for concrete strength testing according to the present invention.
1-body; 11-a containment cavity; 12-through holes; 2-a handle; 3-hooking an arm; 4-measuring the needle; 41-tapered striking end; 5-pressing the shaft; 51-a limit step; 6-a cylindrical spring; 7-an adjusting part; 71-a press plate; 711-graphite damascene annular grooves; 72-adjusting rod; 8-adjusting the nut; 9-locking the nut; 10-abutting sleeve.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The contents of the present invention will be further described in detail with reference to specific examples, and fig. 2 is a schematic structural diagram of a first embodiment of a needle penetrometer suitable for concrete strength detection according to the present invention, which mainly comprises a body 1, a handle 2, a hook arm 3, a stylus 4, a pressing shaft 5, a cylindrical spring 6, and the like. Wherein a receiving cavity 11 and a through hole 12 are arranged in the body 1. The through hole 12 is arranged directly below the accommodation cavity 11 and communicates therewith. The pressing shaft 5 is inserted into the through hole 12, and a limit step 51 is provided at the top end thereof. The handle 2 is hinged on the side wall of the body 1, and the driving hook hanging arm 3 swings circumferentially to realize the control of axial displacement motion of the pressing shaft 5. The measuring needle 4 is fixed at the lower end of the pressure shaft 5 and moves downwards under the driving of the elastic force of the cylindrical spring 6. In addition, it is important to note here that the needle penetrometer suitable for concrete strength testing is additionally provided with an adjusting element 7 and an adjusting nut 8. The adjusting member 7 is composed of two parts, a pressing plate 71 and an adjusting rod 72 vertically connected to the pressing plate 71. The pressing plate 71 is built in the receiving cavity 11. The cylindrical spring 6 is also disposed in the accommodating cavity 11, and two ends of the cylindrical spring elastically abut against the top wall of the accommodating cavity 11 and the upper plane of the limiting step 51, respectively. The adjusting rod 72 penetrates through the top wall of the accommodating cavity 11, and the side wall of the penetrating part of the adjusting rod is provided with an external thread matched with the adjusting nut 8. In the actual operation process, the staff rotates the adjusting nut 8 according to the detection requirement of concrete sampling, thereby driving the adjusting piece 7 to displace along the axial direction thereof, namely changing the compressed amount of the cylindrical spring 6, and further indirectly controlling the size of the lower momentum of the measuring needle 4. Therefore, compared with a needle type penetrometer with a traditional design structure, the impact force value of the measuring needle 4 can be adjusted more conveniently and rapidly, the time consumed by concrete strength testing is effectively shortened, and the detection efficiency is improved.
Here, the elastic member for driving the pressing shaft 5 to move downward may be an elastic member such as a gas spring, an elastic rubber sleeve, or the like, as the case may be, in addition to the above-described cylindrical spring 6.
As the further optimization of the structure of the needle type penetrometer suitable for concrete strength detection, the outer diameter of the pressing plate 71 is preferably matched with the inner diameter of the accommodating cavity 11, and the unilateral clearance is controlled within 0.5mm, so that the adjusting piece 7 can be always kept in a vertical state in the axial displacement process, and the phenomenon of bias voltage of the elastic piece is effectively prevented.
It is known that, during the reciprocating axial displacement of the adjusting member 7, the pressing plate 71 and the adjusting rod 72 thereof are inevitably worn by the relative friction force of the body 1, so as to affect the matching precision of the adjusting member 7, and further cause the reduction of the motion flexibility and precision thereof, for this reason, fig. 3 shows a structural schematic diagram of a second embodiment of the needle-type penetrometer suitable for concrete strength detection in the present invention, which is different from the first embodiment in that: a plurality of graphite-inlaid annular grooves 711 are formed around the outer side walls of the pressure plate 71 and the adjusting rod 72, are used for containing lubricating graphite, and are uniformly distributed along the axial direction of the adjusting member 7 (as shown in fig. 5). The lubricating graphite has excellent self-lubricating property, so that the relative friction coefficient between the regulating member 7 and the body 1 can be greatly reduced, and the abrasion rate of the regulating member is reduced.
Furthermore, as can be seen from fig. 3, a lock nut 9 can be further disposed right above the adjusting nut 8, and is used in a matched manner. After the axial displacement movement of the adjusting piece 7 is adjusted, the locking nut 9 is screwed in time to prevent the adjusting nut 8 from generating self-rotation movement in the later testing process.
Furthermore, the measuring needle 4 and the pressing shaft 5 are preferably detachably connected through a thread pair, so that when the measuring needle 4 is damaged or the service life is prolonged, the renewing operation can be conveniently and quickly completed, and the auxiliary working hours required by the test are reduced to a certain extent.
Generally, the diameter of the probe 4 is preferably controlled to be 3.5-5mm and it has a tapered striking end 41 in order to ensure smooth performance of the test process and accuracy of the test result.
It is known that, during the testing process, the needle-type penetrometer is required to be abutted against the concrete member, so that the bottom end surface of the needle-type penetrometer is easily abraded, and therefore, on one hand, the inclination phenomenon of the measuring needle 4 is easily caused, so that the penetration depth of the needle hole is influenced, and the accuracy of the measuring result is further influenced; on the other hand, the service life of the needle type penetrometer is influenced, and equipment purchasing cost is increased in a direction-changing manner. In order to solve the above technical problem, fig. 4 shows a schematic structural diagram of a third embodiment of a needle type penetrometer suitable for concrete strength detection in the present invention, which is different from the two embodiments in that: the additional top rest sleeve 10 is detachably fixed at the lower end of the body 1, and is provided with a through hole for the probe 4 to freely pass through, and the top rest sleeve 10 is required to have better abrasion resistance.
Generally, two ways of ensuring good wear resistance of the abutment sleeve 10 are recommended, in particular as follows: 1) a titanium nitride wear-resistant coating (not shown in the figure) is arranged on the lower end surface of the abutting sleeve 10, and the thickness is controlled to be 2-2.5 mu m; 2) the abutment sleeve 10 is made of cemented carbide.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A needle type penetrometer suitable for concrete strength detection comprises a body, a handle, a hook arm, a measuring needle, a pressing shaft and an elastic piece; an accommodating cavity and a through hole are formed in the body; the through hole is arranged right below the accommodating cavity and is communicated with the accommodating cavity; the pressing shaft penetrates through the through hole, and a limiting step is arranged at the top end of the pressing shaft; the elastic piece is arranged in the accommodating cavity and elastically abuts against the upper plane of the limiting step; the handle is hinged to the side wall of the body and drives the hook arm to circumferentially swing so as to control the axial displacement motion of the pressing shaft; the measuring probe is fixed at the lower end of the pressure shaft and moves downwards under the driving of the elastic force of the elastic part, and the measuring probe is characterized by further comprising an adjusting part and an adjusting nut; the adjusting piece comprises a pressing plate and an adjusting rod vertically connected with the pressing plate; the pressing plate is arranged in the accommodating cavity and is always abutted against the elastic piece; the adjusting rod penetrates through the top wall of the accommodating cavity, and an external thread matched with the adjusting nut is arranged on the side wall of the penetrating part of the adjusting rod.
2. The needle penetrometer suitable for concrete strength testing of claim 1, wherein an outer diameter of said pressure plate is adapted to an inner diameter of said receiving cavity.
3. The needle-type penetrometer applicable to concrete strength detection according to claim 2, wherein a plurality of graphite inlaid annular grooves are formed around the outer side walls of the pressure plate and the adjusting rod and are uniformly distributed along the axial direction of the adjusting piece.
4. The needle-type penetrometer suitable for concrete strength testing according to claim 1, wherein the probe and the pressing shaft are detachably coupled by a screw thread pair.
5. The needle type penetrometer suitable for concrete strength test according to claim 1, wherein the diameter of the measuring needle is controlled to be 3.5-5mm and it has a conical striking end.
6. The needle-type penetrometer suitable for concrete strength testing according to claim 1, wherein the elastic member is a cylindrical spring or an elastic rubber sleeve.
7. The needle-type penetrometer applicable to concrete strength detection according to any one of claims 1 to 6, further comprising a propping sleeve which is detachably fixed at the lower end of the body and is provided with a through hole for the probe to freely pass through.
8. The needle type penetrometer suitable for concrete strength detection according to claim 7, wherein a titanium nitride wear-resistant coating is provided on the lower end face of the abutting sleeve, and the thickness is controlled to be 2-2.5 μm.
9. The needle penetrometer adapted for concrete strength testing of claim 7, wherein said abutment sleeve is made of cemented carbide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952711.1A CN110823725A (en) | 2019-10-09 | 2019-10-09 | Pin type penetrometer suitable for concrete strength detection |
| PCT/CN2019/118059 WO2021068342A1 (en) | 2019-10-09 | 2019-11-13 | Needle-type penetrometer suitable for concrete strength measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952711.1A CN110823725A (en) | 2019-10-09 | 2019-10-09 | Pin type penetrometer suitable for concrete strength detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110823725A true CN110823725A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910952711.1A Pending CN110823725A (en) | 2019-10-09 | 2019-10-09 | Pin type penetrometer suitable for concrete strength detection |
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| Country | Link |
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| CN (1) | CN110823725A (en) |
| WO (1) | WO2021068342A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7511526B2 (en) | 2021-05-28 | 2024-07-05 | Ｊｆｅシビル株式会社 | How to measure the strength of concrete surfaces |
| CN113358504A (en) * | 2021-06-01 | 2021-09-07 | 中汽智达(洛阳)建设监理有限公司 | Concrete strength detection device and use method thereof |
| CN116337653B (en) * | 2023-03-27 | 2023-11-03 | 扬州华正建筑工程质量检测有限公司 | Concrete prefab intensity detection device for building engineering |
| CN116413143B (en) * | 2023-06-08 | 2023-09-15 | 烟台博馨工程技术有限公司 | Penetration type mortar strength detector |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2208702Y (en) * | 1994-08-19 | 1995-09-27 | 天津市建筑仪器试验机公司 | Penetration type test instrument for concrete strength |
| CN2648436Y (en) * | 2003-09-12 | 2004-10-13 | 遵化市东陵盛业设备仪器厂 | Strength measuring apparatus for needling injected high-strength concrete |
| KR101174794B1 (en) * | 2010-07-09 | 2012-08-17 | 한국유지관리 주식회사 | Elastic wave measurement device for nondestructive evaluation of concrete structure |
| CN204027952U (en) * | 2014-06-27 | 2014-12-17 | 尚廷东 | Mortar penetrometer calibrating installation |
| CN205719738U (en) * | 2016-05-07 | 2016-11-23 | 王庆表 | A kind of novel penetration type concrete strength inspection device |
| CN106769449B (en) * | 2016-11-28 | 2020-04-07 | 广州市建筑材料工业研究所有限公司 | Method for rapidly detecting strength of on-site autoclaved aerated concrete block |
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2019
- 2019-10-09 CN CN201910952711.1A patent/CN110823725A/en active Pending
- 2019-11-13 WO PCT/CN2019/118059 patent/WO2021068342A1/en active Application Filing
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| WO2021068342A1 (en) | 2021-04-15 |
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