CN103822826B - Method and instrument for detecting concrete compression strength with pulling escape method - Google Patents
Method and instrument for detecting concrete compression strength with pulling escape method Download PDFInfo
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- CN103822826B CN103822826B CN201310307757.0A CN201310307757A CN103822826B CN 103822826 B CN103822826 B CN 103822826B CN 201310307757 A CN201310307757 A CN 201310307757A CN 103822826 B CN103822826 B CN 103822826B
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Abstract
The invention relates to a method and instrument for detecting concrete compression strength with a pulling escape method. The instrument for detecting the concrete compression strength with the pulling escape method is composed of a pulling-supporting device and a data acquisition device, wherein the pulling-supporting device comprises a stressing mechanism, a pressure sensing mechanism, a pulling-supporting mechanism and a reaction frame; the data acquisition device is connected with the pressure sensing mechanism in the pulling-supporting device through a data line; the stressing mechanism comprises a speed reducer shell, a worm, a speed reducer handle, a worm wheel and a spline inserted into the worm wheel; the pressure sensing mechanism comprises a pressure sensor, a converting sleeve and a compression nut put on the converting sleeve; the pulling-supporting mechanism comprises a draw bar, a lifting block, a fixed tray, at least three jaws and at least three sets of link mechanisms, and each set of link mechanism comprises a force guide bar, a lever arm of force and a balance bar. When the instrument for detecting the concrete compression strength with the pulling escape method is used, a concrete core specimen subjected to pulling escape cannot be twisted off, the clamping speed of the pulling-supporting mechanism can be controlled, and the labor is saved.
Description
Technical field
The present invention relates to concrete strength inspection technical field, particularly a kind of method and instrument detecting concrete crushing strength.
Background technology
Concrete strength inspection techniques and methods conventional at present has Non-Destructive Testing and damage testing two kinds.Described Non-Destructive Testing is divided into rebound method, overall approach, ultrasonic method etc., and it utilizes concrete surface hardness, carbonation depth and parameters,acoustic conversion concrete strength, and Non-Destructive Testing is easy to operate, but testing result error is larger.Described damage testing is divided into core drilling method again, pull-out post-insert method, penetration method, rear anchoring method, pulling out method etc., it is the test specimen mechanics parameter conversion concrete strength utilizing regulation, damage testing result precision is higher, but concrete is damaged large, and it is many to there is operation, the shortcomings such as operation inconvenience, as conventional core drilling method, its core test specimen drills through, cutting and the both ends of the surface depth of parallelism, end face and axis verticality process and test specimen production process, operating process etc. are all comparatively loaded down with trivial details, and although La Tuofa is little to structural damage, but support mechanism and core will be drawn to bond because adopting epoxy resin, therefore affect greatly by temperature factor, running time is long, just can operate after needing dry intensity to be generated, therefore slippage should be there is, also environmental pollution can be produced simultaneously.
Summary of the invention
The object of this invention is to provide a kind of not only can Non-Destructive Testing concrete, but also there is method and the instrument that the high Pulling escape of testing result precision detects concrete crushing strength.
For achieving the above object, the present invention adopts following technical scheme: a kind of Pulling escape detects the method for concrete crushing strength, it is characterized in that step is as follows: step one, detected concrete is selected N number of position pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, then with the instrument of Pulling escape detection concrete crushing strength, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, then by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, and then the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, this concrete crushing strength is also called concrete Conversion strength,
Step 2, to be added up by the N number of concrete Conversion strength obtained in above-mentioned steps, then divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, i.e. the typical value of concrete strength.
Described concrete strength-measuring formula can be
, in formula
represent the
the concrete Conversion strength of individual concrete core sample;
represent the
the concrete tensile strength of individual concrete core sample.
In described step one, can be in detected concrete, first select a position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, the instrument detecting concrete crushing strength with Pulling escape carries out pull-off test to this concrete core sample, record this concrete core sample and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of this concrete core sample, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of this concrete core sample is gone out according to concrete strength-measuring formulae discovery, the i.e. concrete Conversion strength of this concrete core sample, and then repeat said process N-1 time, obtain N-1 concrete Conversion strength, finally obtain N number of concrete Conversion strength.
In described step one, also can be in detected concrete, first select N number of position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, and then with the instrument of Pulling escape detection concrete crushing strength, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, finally obtain N number of concrete Conversion strength.
Pulling escape in a kind of method being applied in above-mentioned Pulling escape detection concrete crushing strength detects the instrument of concrete crushing strength, form by drawing rest device and data collector, the described rest device that draws includes boosting mechanism, pressure sensitive mechanism, draws support mechanism and reaction frame, described data collector is connected with drawing the pressure sensitive mechanism in rest device by data line, it is characterized in that:
Described boosting mechanism comprises reducer shell, be arranged on reducer shell in and input end through reducer shell to the external worm screw of reducing gearbox, be arranged in reducing gearbox external and with the input end of worm screw drive be connected reductor handle, be arranged on reducer shell and with the worm gear of worm mesh and the spline being inserted in worm gear, the upper surface of described spline is provided with transmission rod, and the lower surface of spline is provided with screw.
Described pressure sensitive mechanism comprises the pressure transducer be fixed on reducer shell upper surface, is fixed on the swivel sleeve of pressure transducer upper end and takes the gland nut be placed on swivel sleeve, transmission rod on described spline, from bottom to top successively through after reducer shell, pressure transducer and swivel sleeve, and is taken the gland nut be placed on swivel sleeve and is threaded;
The described support mechanism that draws comprises upper end from the bottom to top through reducer shell and the lifting rod be threaded in the screw of spline, be threaded in the lift block of lifting rod bottom, to be positioned at below lifting rod and to be evenly equipped with the shaft collar of at least three group shaft collar connecting links, be positioned at least three lobe claws formed below shaft collar and by arc clamping head and the claw connecting link be located on arc clamping head lateral wall, and by linkage assembly that lift block, shaft collar and claw link together;
Described linkage assembly has three groups at least, often organize linkage assembly and include force-guided stem, lever arm of force and balance stem, wherein one end of force-guided stem is articulated and connected on lift block, the other end of force-guided stem is connected with the upper end thereof of lever arm of force, the stage casing of lever arm of force is articulated and connected on shaft collar connecting link, the lower end of lever arm of force is articulated and connected on claw connecting link, described balance stem is positioned at inner side or the outside of lever arm of force, and the upper end thereof of balance stem is connected to shaft collar connecting link upper and lower end is articulated and connected on claw connecting link.
Described reaction frame is at least three support bars be connected on reducer shell lower surface.
Described boosting mechanism also can comprise the shaft block ring on the transmission rod that is enclosed within above gland nut.
Described pressure sensitive mechanism also can comprise the swivel sleeve gland bonnet being threaded in swivel sleeve upper end.
The described support mechanism that draws also can comprise the slotted nut being threaded in lifting rod lower end, and the upper surface of this slotted nut is pressed on the lower surface of lift block.
The described shell body drawing rest device also can comprise to be connected on linkage assembly and the shell fixed head be connected between two adjacent shell bodies.
The lower end of described support bar can be provided with ball joint head, has one can the adjustment supporting leg of ball joint head universal rotational be relatively connected on ball joint head by spring clip.
Compared with prior art the present invention has following characteristics and beneficial effect: the present invention be a kind of not only can Non-Destructive Testing concrete, but also there is the method and apparatus that the high Pulling escape of testing result precision detects concrete crushing strength.
A kind of method detecting normal concrete compressive strength when described Pulling escape detects the method for concrete crushing strength, to the axial pulling-out force applied perpendicular to pressure-bearing surface of concrete core sample with special concrete pulling off apparatus, tension core is made to pull destruction vertically, and according to pulling tension and come the detection method of establish concrete strength.
The method that described Pulling escape detects concrete crushing strength is very little to the damage of detected concrete, drilling depth in detected concrete is only a millimeter rank (40mm ~ 45mm), so be applicable to the concrete detecting Reinforcing Bar with Dense Disposition, belong to concrete nondestructive testing new technique.
The method that described Pulling escape detects concrete crushing strength for be the detection of the internal intensity of detected concrete, its measuring accuracy is higher than classic method, fast easy to detect.
The method detection scope in the length of time that described Pulling escape detects concrete crushing strength is wide, it is all that to drill shaping tensile test piece all applicable, the applicable age of concrete can to 14 days, can be the stretch-draw of prestressed concrete and to put and the construction in concrete early length of time provides technical data.
The method of described Pulling escape detection concrete crushing strength is applicable to the detection of the Structural Engineering concrete strength of C10-C100, has the advantage that operation is few, simple to operation, accurate quick, cost are low, applicability is strong.
The shape of method to detected concrete that described Pulling escape detects concrete crushing strength is not particularly limited, the restriction of test position is less, detected concrete does not need any processing process (without the need to process, the concrete core sample be drilled to does not need process yet on the surface of on-the-spot test position).
The method that described Pulling escape detects concrete crushing strength can detect concrete compressive strength, have substantial different from other concrete strength detecting methods existing at present, there is good application value, can better improve and enrich concrete strength inspection technology.
The instrument that described Pulling escape detects concrete crushing strength has simply, fast, do not need to process test specimen, the feature that can detect the concrete crushing strength of different larval instar little to structural damage.
(application publication number is CN102866056A for draw rest device and the straight pulling device of pull-type in the instrument of described Pulling escape detection concrete crushing strength, Shen Qing Publication day is the Chinese patent application of on 01 09th, 2013) compare, there is some benefit following: 1, the rotational plane of the torque handle in the straight pulling device of pull-type is vertical with the moving direction of lifting rod, under the effect of moment of torsion, certain moment of torsion can be born by the concrete core sample lifted, so have by the danger twisted off, and the rotational plane of the reductor handle that Pulling escape detects in the instrument of concrete crushing strength is parallel with the direction of lifting rod movement, so do not produce the trend of moment of torsion to concrete core sample, therefore better stressed by the concrete core sample lifted, not by the danger twisted off, 2, the Pulling escape boosting mechanism detected in the instrument of concrete crushing strength can control to draw support mechanism clamp or unclamp, and the speed clamping or unclamp, and the straight pulling device of pull-type is not all right, 3, the boosting mechanism that Pulling escape detects in the instrument of concrete crushing strength uses more laborsaving, 4, the structure of the instrument of Pulling escape detection concrete crushing strength is compacter, more rationally, more good-looking.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is the schematic front view that Pulling escape detects the instrument of concrete crushing strength.
Fig. 2 is that schematic diagram is looked on the right side of Fig. 1.
Fig. 3 is the schematic top plan view of Fig. 1.
Fig. 4 is the schematic diagram of A-A section in Fig. 1.
Fig. 5 is the schematic diagram of B-B section in Fig. 1.
Fig. 6 is the schematic diagram of C-C section in Fig. 2.
Fig. 7 is the schematic diagram of D-D section in Fig. 3.
Fig. 8 is the schematic diagram of spline.
Fig. 9 is the schematic top plan view of Fig. 8.
Figure 10 is the schematic diagram of lift block.
Figure 11 is the schematic diagram of shaft collar.
Figure 12 is the schematic diagram of claw.
Figure 13 is the schematic front view of reductor handle.
Figure 14 is the schematic top plan view of Figure 13.
Figure 15 is the schematic diagram of speed reduction unit upper cover.
Figure 16 is the schematic diagram of speed reduction unit lower cover.
Figure 17 is the schematic diagram of shell body.
Figure 18 is the schematic diagram of shell fixed head.
Reference numeral: 1-reducer shell, 1.1-speed reduction unit upper cover, 1.2-speed reduction unit lower cover, 2-worm screw, 3-reductor handle, 4-worm gear, 5-spline, 5.1-transmission rod, 5.2-screw;
6-pressure transducer, 7-swivel sleeve, 8-gland nut, 9-shaft block ring, 10-swivel sleeve gland bonnet;
11-lifting rod, 12-lift block, 13-shaft collar, 13.1-shaft collar connecting link, 14-claw, 14.1-arc clamping head, 14.2-claw connecting link, 15-force-guided stem, 16-lever arm of force, 17-balance stem, 18-slotted nut;
19-support bar, 19.1-ball joint head, 20-regulate supporting leg, 21-spring clip;
22-shell body, 23-shell fixed head;
24-bearing washer and thrust bearing, 25-deep groove ball bearing, 26-linear bearing, fixing female, the 28-Phillips head bolts of 27-linear bearing.
Embodiment
This Pulling escape detects the method for concrete crushing strength, its step is as follows: step one, detected concrete is selected N number of position pull test specimen position as what drill concrete core sample (i.e. core test specimen), columniform concrete core sample is drilled (in the present embodiment at the test specimen position that pulls chosen, adopt internal diameter Φ 44mm, the hollow boring bit of external diameter Φ 54mm drills), then with the instrument of Pulling escape detection concrete crushing strength, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, then by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, and then the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, this concrete crushing strength is also called concrete Conversion strength, step 2, to be added up by the N number of concrete Conversion strength obtained in above-mentioned steps, then divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, i.e. the typical value of concrete strength.
In the present embodiment, concrete strength-measuring formula is
, in formula
represent the
the concrete Conversion strength of individual concrete core sample;
represent the
the concrete tensile strength of individual concrete core sample.Certainly, along with the development of technology, this formula also may have some later and revise, or has new concrete strength-measuring formula appearance.
In described step one, can be in detected concrete, first select a position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, the instrument detecting concrete crushing strength with Pulling escape carries out pull-off test to this concrete core sample, record this concrete core sample and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of this concrete core sample, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of this concrete core sample is gone out according to concrete strength-measuring formulae discovery, the i.e. concrete Conversion strength of this concrete core sample, and then repeat said process N-1 time, obtain N-1 concrete Conversion strength, finally obtain N number of concrete Conversion strength.
In described step one, also can be in detected concrete, first select N number of position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, and then with the instrument of Pulling escape detection concrete crushing strength, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, finally obtain N number of concrete Conversion strength.
The described test specimen position that pulls is evenly arranged in detected concrete, and adjacent two distances pulled between test specimen position are not less than 30mm, and the end limit pulling test specimen position distance detected concrete is not less than 25mm.In general the diameter of described concrete core sample is 38mm ~ 49mm(is 38mm, 44mm or 49mm), length is 40mm ~ 45mm.Described concrete core sample is the concrete core sample linked together with detected concrete.
Shown in Fig. 1-3, described Pulling escape detects the instrument of concrete crushing strength, form by drawing rest device and data collector, the described rest device that draws includes boosting mechanism, pressure sensitive mechanism, draws support mechanism and reaction frame, and described data collector is connected with drawing the pressure sensitive mechanism in rest device by data line.
See Fig. 1-3, Fig. 4, Fig. 7-9, in the present embodiment, described boosting mechanism comprises reducer shell 1, be arranged in reducer shell 1 and input end through reducer shell to the external worm screw 2 of reducing gearbox, to be arranged in reducing gearbox external and drive the reductor handle 3(be connected see Figure 13, Figure 14 with the input end of worm screw), be arranged on reducer shell and the worm gear 4 engaged with worm screw 2 and the spline 5 being inserted in worm gear 4, the upper surface of described spline 5 is provided with transmission rod 5.1, and the lower surface of spline 5 is provided with screw 5.2; In the present embodiment, boosting mechanism also comprises the shaft block ring 9 on the transmission rod 5.1 that is enclosed within above gland nut 8, and described reducer shell 1 is formed by connecting by threaded fastener by speed reduction unit upper cover 1.1 and speed reduction unit lower cover 1.2.
See Fig. 1-3, Fig. 4, Fig. 7, in the present embodiment, described pressure sensitive mechanism comprises the pressure transducer 6 be fixed on reducer shell upper surface, is fixed on the swivel sleeve 7 of pressure transducer 6 upper end and takes the gland nut 8 be placed on swivel sleeve 7, transmission rod 5.1 on described spline 5, from bottom to top successively through after reducer shell 1, pressure transducer 6 and swivel sleeve 7, and is taken the gland nut 8 be placed on swivel sleeve 7 and is threaded; In the present embodiment, pressure sensitive mechanism also comprises the swivel sleeve gland bonnet 10 being threaded in swivel sleeve 7 upper end.
See Fig. 1-4, Fig. 7, in the present embodiment, the described support mechanism that draws comprises upper end from the bottom to top through reducer shell and the lifting rod 11 be threaded in the screw 5.2 of spline 5, be threaded in the lift block 12(of lifting rod 11 bottom see Figure 10), be positioned at below lifting rod, and be evenly equipped with the shaft collar 13(of at least three group shaft collar connecting links 13.1 see Figure 11), be positioned at below shaft collar, and at least three lobe claw 14(be made up of arc clamping head 14.1 and the claw connecting link 14.2 be located on arc clamping head lateral wall are see Figure 12), and by lift block 12, the linkage assembly that shaft collar 13 and claw 14 link together, in the present embodiment, draw support mechanism also to comprise to be threaded in the slotted nut 18 of lifting rod 11 lower end, and the upper surface of this slotted nut 18 is pressed on the lower surface of lift block 12.
See Fig. 4, Fig. 7, in the present embodiment, described linkage assembly has three groups at least, often organize linkage assembly and include force-guided stem 15, lever arm of force 16 and balance stem 17, wherein one end of force-guided stem 15 is articulated and connected on lift block 12, the other end of force-guided stem 15 is connected with the upper end thereof of lever arm of force 16, the stage casing of lever arm of force 16 is articulated and connected on shaft collar connecting link 13.1, the lower end of lever arm of force 16 is articulated and connected on claw connecting link 14.2, described balance stem 17 is positioned at inner side or the outside of lever arm of force 16, and the upper end thereof of balance stem 17 is connected on shaft collar connecting link 13.1, lower end is articulated and connected on claw connecting link 14.2,
See Fig. 1-4, Fig. 7, in the present embodiment, described reaction frame is be connected at least three support bars 19 on reducer shell 1 lower surface, and support bar 19 also can be called counter-force bar, and support bar 19 is bolted on reducer shell 1.
See Fig. 4, Fig. 7, in the present embodiment, the lower end of support bar 19 is provided with ball joint head 19.1, has one can the adjustment supporting leg 20 of ball joint head universal rotational be relatively connected on ball joint head by spring clip 21.Described adjustment supporting leg 20 is multi-axis foots that a kind of axial line of adjustable lifting rod and the axis of concrete core sample (core test specimen) are always parallel relation.Counter-force bar increases the multi-axis foot of fine setting, is convenient to the axis centering with concrete core sample.
In the present embodiment, draw rest device also to comprise and be connected to shell body 22 on linkage assembly by Phillips head bolts 28 and be connected to shell fixed head 23(between two adjacent shell bodies 22 see Figure 17, Figure 18 by Phillips head bolts 28), shell body 22 and shell fixed head 23 make to draw rest device more attractive in appearance, also can play certain protective action simultaneously.
In the present embodiment, data collector be a kind of be furnished with digital acquisition device pull instrument, it is a kind of universal portable push-pull effort testing tool, be commercially purchase available, have that volume is little, lightweight, portable, function is many, precision is high, full test process, the feature such as simple to operate, multiple functional can be caught by curve, be applicable to the push-pull effort test, contact engaging and separating force test, destructive test etc. of various product, and the small-scale test machine of different purposes can be formed in conjunction with various tester table and fixture.
In other embodiments, the rest device that draws that described Pulling escape detects in the instrument of concrete crushing strength also can replace to the straight pulling device of pull-type (Chinese patent application that application publication number is CN102866056A, Shen Qing Publication day is on 01 09th, 2013).
The instrument adopting Pulling escape to detect concrete crushing strength is tested: first entangle concrete core sample with three lobe claws, press the pushbutton switch of data collector, make it in manual peak value guard mode, after clearing, the reductor handle 3(that turns clockwise also is afterburning handle), while lifting rod is mentioned, concrete core sample clamps by the arc clamping head of claw, the instrument digital of data collector is when being not more than 10N, adjustment counter-force bar, it is made fully to contact with detected concrete surface layer, and the axial bus adjusting three lobe claws and concrete core sample on the same axis, continue to rotate reductor handle 3, lifting rod continues to promote, utilize lever principle, moved up by lifting rod, three force-guided stems be connected with lifting rod, outside promotion lever arm of force, lever arm of force with the fulcrum of shaft collar for axle center makes the lower end of lever arm of force inwardly rotate, the lower end of lever arm of force promotes arc clamping head and inwardly shrinks together with balance stem, clamping force is implemented to concrete core sample, the concrete core sample be clamped stops lifting rod to move up, due to counter-force bar secure reducer shell and claw spacing, fastening force after clamping concrete core sample does not allow claw to move up with lifting rod, lifting rod constantly promotes, clamping force continues to increase, also there is the pulling-out force of an axis along lifting rod (identical with lifting rod moving direction) simultaneously, now concrete core sample bears radial pressure, concrete tensile strength is utilized to be less than the feature of compressive strength, concrete core sample is finally made to rupture (or cry pull).During concrete core sample fracture, pull the pulling force peak value of moment with data collector collection concrete core sample and detected concrete.
Owing to have employed at least three lobe claws, the subtle change of the diameter of concrete core sample, experiment work can not be affected.
Described pressure sensitive mechanism adopts special construction, is wherein connected with reducer shell below pressure transducer, above pressure transducer, swivel sleeve is housed, and effectively pressure change can be passed to data collector.The described data collector be connected in pressure sensitive mechanism can automatic pressure acquisition peak value.
Described boosting mechanism have employed turbine and worm device, screw on the lower surface of the spline established in turbine is connected with lifting rod, transmission rod on the upper surface of spline is connected with pressure transducer together with swivel sleeve, when clockwise direction shake reductor handle, the rotation of turbine drives spline to rotate together, screw on the lower surface of spline is equivalent to a nut, lifting rod is moved up, again due to after claw clamps concrete core sample, the movement of lifting rod can be stoped, a pair relative counter-force can be defined, and due in turbine spline allow spline axially move, so this counter-force can be passed to pressure transducer by swivel sleeve.
In order to reduce friction force, the position of all rotations is equipped with bearing.See Fig. 4, Fig. 6, Fig. 7, between swivel sleeve and gland nut, between the upper surface of spline 5 and reducer shell 1, between the lower surface of spline 5 and reducer shell 1, be equipped with bearing washer and thrust bearing 24.Deep groove ball bearing 25 is equipped with between worm gear 4 and reducer shell, between worm screw 2 and reducer shell.Be provided with linear bearing 26 between lifting rod 11 and reducer shell, the upper end of linear bearing 26 is also pressed with linear bearing fixing female 27.
The method that described Pulling escape detects concrete crushing strength is as shown in table 1 with the key distinction of other detection methods.
The main difference that described Pulling escape detects the method for concrete crushing strength and La Tuofa is as shown in table 2.
Claims (8)
1. Pulling escape detects a method for concrete crushing strength, it is characterized in that step is as follows:
Step one, detected concrete is selected N number of position pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, the diameter of described concrete core sample is 38mm ~ 49mm, length is 40mm ~ 45mm, then the instrument clamping concrete core sample of concrete crushing strength is detected with Pulling escape, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, then by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, and then the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, this concrete crushing strength is also called concrete Conversion strength,
Described Pulling escape detects the instrument of concrete crushing strength, it forms by drawing rest device and data collector, the described rest device that draws includes boosting mechanism, pressure sensitive mechanism, draw support mechanism and reaction frame, described data collector is connected with drawing the pressure sensitive mechanism in rest device by data line, described boosting mechanism comprises reducer shell (1), to be arranged in reducer shell (1) and input end through reducer shell to the external worm screw (2) of reducing gearbox, be positioned at reducing gearbox external and drive with the input end of worm screw the reductor handle (3) be connected, to be arranged in reducer shell and the worm gear (4) engaged with worm screw (2), and the spline (5) be inserted in worm gear (4), the upper surface of described spline (5) is provided with transmission rod (5.1), the lower surface of spline (5) is provided with screw (5.2), described pressure sensitive mechanism comprises the pressure transducer (6) be fixed on reducer shell upper surface, is fixed on the swivel sleeve (7) of pressure transducer (6) upper end and takes the gland nut (8) be placed on swivel sleeve (7), transmission rod (5.1) on described spline (5), from bottom to top successively through after reducer shell (1), pressure transducer (6) and swivel sleeve (7), and is taken the gland nut (8) be placed on swivel sleeve (7) and is threaded, the described support mechanism that draws comprises upper end from the bottom to top through reducer shell and the lifting rod (11) be threaded in the screw (5.2) of spline (5), be threaded in the lift block (12) of lifting rod (11) bottom, be positioned at below lifting rod, and be evenly equipped with the shaft collar (13) of at least three group shaft collar connecting links (13.1), be positioned at below shaft collar, and at least three lobe claws (14) be made up of arc clamping head (14.1) and the claw connecting link (14.2) be located on arc clamping head lateral wall, and by lift block (12), the linkage assembly that shaft collar (13) and claw (14) link together, described linkage assembly has three groups at least, often organize linkage assembly and include force-guided stem (15), lever arm of force (16) and balance stem (17), wherein one end of force-guided stem (15) is articulated and connected on lift block (12), the other end of force-guided stem (15) is connected with the upper end thereof of lever arm of force (16), the stage casing of lever arm of force (16) is articulated and connected on shaft collar connecting link (13.1), the lower end of lever arm of force (16) is articulated and connected on claw connecting link (14.2), described balance stem (17) is positioned at inner side or the outside of lever arm of force (16), and the upper end thereof of balance stem (17) is connected on shaft collar connecting link (13.1), lower end is articulated and connected on claw connecting link (14.2), described reaction frame is at least three support bars (19) be connected on reducer shell (1) lower surface,
Step 2, to be added up by the N number of concrete Conversion strength obtained in step one, then divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, i.e. the typical value of concrete strength.
2. Pulling escape according to claim 1 detects the method for concrete crushing strength, it is characterized in that: described concrete strength-measuring formula is
, in formula
represent the
the concrete Conversion strength of individual concrete core sample;
represent the
the concrete tensile strength of individual concrete core sample.
3. Pulling escape according to claim 1 detects the method for concrete crushing strength, it is characterized in that: in described step one, step a, in detected concrete, first select a position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, the instrument detecting concrete crushing strength with Pulling escape carries out pull-off test to this concrete core sample, record this concrete core sample and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of this concrete core sample, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of this concrete core sample is gone out according to concrete strength-measuring formulae discovery, the i.e. concrete Conversion strength of this concrete core sample, step b, repetition step a N-1 time, obtain N-1 concrete Conversion strength, finally obtain N number of concrete Conversion strength.
4. Pulling escape according to claim 1 detects the method for concrete crushing strength, it is characterized in that: in described step one, in detected concrete, first select N number of position to pull test specimen position as what drill concrete core sample, columniform concrete core sample is drilled at the test specimen position that pulls chosen, and then with the instrument of Pulling escape detection concrete crushing strength, pull-off test is carried out to all concrete core samples, record all concrete core samples and pulled off the stretching resistance peak value of moment, by formula concrete tensile strength=F/S, calculate the concrete tensile strength of all concrete core samples, wherein F is stretching resistance peak value, S is the area of section of concrete core sample, the concrete tensile strength obtained is substituted into concrete strength-measuring formula, the concrete crushing strength of all concrete core samples is gone out according to concrete strength-measuring formulae discovery, finally obtain N number of concrete Conversion strength.
5. the instrument of a Pulling escape detection concrete crushing strength, form by drawing rest device and data collector, the described rest device that draws includes boosting mechanism, pressure sensitive mechanism, draws support mechanism and reaction frame, described data collector is connected with drawing the pressure sensitive mechanism in rest device by data line, it is characterized in that:
Described boosting mechanism comprises reducer shell (1), be arranged on reducer shell (1) in and input end through reducer shell to the external worm screw (2) of reducing gearbox, be arranged in reducing gearbox external and with the input end of worm screw drive be connected reductor handle (3), be arranged on reducer shell and the worm gear (4) engaged with worm screw (2) and the spline (5) being inserted in worm gear (4), the upper surface of described spline (5) is provided with transmission rod (5.1), and the lower surface of spline (5) is provided with screw (5.2);
Described pressure sensitive mechanism comprises the pressure transducer (6) be fixed on reducer shell upper surface, is fixed on the swivel sleeve (7) of pressure transducer (6) upper end and takes the gland nut (8) be placed on swivel sleeve (7), transmission rod (5.1) on described spline (5), from bottom to top successively through after reducer shell (1), pressure transducer (6) and swivel sleeve (7), and is taken the gland nut (8) be placed on swivel sleeve (7) and is threaded;
The described support mechanism that draws comprises upper end from the bottom to top through reducer shell and the lifting rod (11) be threaded in the screw (5.2) of spline (5), be threaded in the lift block (12) of lifting rod (11) bottom, be positioned at below lifting rod, and be evenly equipped with the shaft collar (13) of at least three group shaft collar connecting links (13.1), be positioned at below shaft collar, and at least three lobe claws (14) be made up of arc clamping head (14.1) and the claw connecting link (14.2) be located on arc clamping head lateral wall, and by lift block (12), the linkage assembly that shaft collar (13) and claw (14) link together,
Described linkage assembly has three groups at least, often organize linkage assembly and include force-guided stem (15), lever arm of force (16) and balance stem (17), wherein one end of force-guided stem (15) is articulated and connected on lift block (12), the other end of force-guided stem (15) is connected with the upper end thereof of lever arm of force (16), the stage casing of lever arm of force (16) is articulated and connected on shaft collar connecting link (13.1), the lower end of lever arm of force (16) is articulated and connected on claw connecting link (14.2), described balance stem (17) is positioned at inner side or the outside of lever arm of force (16), and the upper end thereof of balance stem (17) is connected on shaft collar connecting link (13.1), lower end is articulated and connected on claw connecting link (14.2),
Described reaction frame is at least three support bars (19) be connected on reducer shell (1) lower surface;
Described boosting mechanism also comprises the shaft block ring (9) on the transmission rod (5.1) being enclosed within gland nut (8) top;
Described pressure sensitive mechanism also comprises the swivel sleeve gland bonnet (10) being threaded in swivel sleeve (7) upper end.
6. Pulling escape according to claim 5 detects the instrument of concrete crushing strength, it is characterized in that: described in draw support mechanism also to comprise to be threaded in the slotted nut (18) of lifting rod (11) lower end, and the upper surface of this slotted nut (18) is pressed on the lower surface of lift block (12).
7. Pulling escape according to claim 5 detects the instrument of concrete crushing strength, it is characterized in that: described in the shell fixed head (23) that draws rest device also to comprise to be connected to the shell body (22) on linkage assembly and be connected between two adjacent shell bodies (22).
8. Pulling escape according to claim 5 detects the instrument of concrete crushing strength, it is characterized in that: the lower end of described support bar (19) is provided with ball joint head (19.1) having one can the adjustment supporting leg (20) of ball joint head universal rotational be relatively connected on ball joint head by spring clip (21).
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| CN201310307757.0A CN103822826B (en) | 2013-07-22 | 2013-07-22 | Method and instrument for detecting concrete compression strength with pulling escape method |
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| CN201310307757.0A CN103822826B (en) | 2013-07-22 | 2013-07-22 | Method and instrument for detecting concrete compression strength with pulling escape method |
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| CN103822826B true CN103822826B (en) | 2015-05-20 |
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| CN104165804B (en) * | 2014-09-02 | 2016-09-28 | 建研科技股份有限公司 | Concrete compressive strength detector |
| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN108181176A (en) * | 2018-03-06 | 2018-06-19 | 廊坊市阳光建设工程质量检测有限公司 | A kind of equipment and its detection method of Pulling escape detection concrete crushing strength |
| CN110553901B (en) * | 2019-09-19 | 2024-05-14 | 湖南大学 | Anchor assembly complete device for detecting strength by post-loading and pull-out method and detection method |
| CN110501227B (en) * | 2019-09-23 | 2024-09-06 | 水清木华结构设计事务所(深圳)有限公司 | Expansion wedge type drawing device and drawing method |
| CN110954406B (en) * | 2019-12-19 | 2020-08-18 | 浙江中星制针股份有限公司 | High alumina porcelain insulating material mechanical strength check out test set |
| US11065696B1 (en) * | 2021-02-01 | 2021-07-20 | Michael R Eliash | System, apparatus, and method for removing a portion of a structure |
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| CA934979A (en) * | 1969-12-19 | 1973-10-09 | Snamprogetti S.P.A. | Apparatus for determining the compression strength of spheroidal material made of uranium thorium and plutonium mixed oxides and the like |
| EP0555509A1 (en) * | 1992-02-14 | 1993-08-18 | Carl Schenck Ag | High-speed tensile testing machine |
| CN1424568A (en) * | 2002-12-30 | 2003-06-18 | 蒋元海 | Tubular pile centrifugal high strength concrete compression strength testing method by drill core |
| JP4620956B2 (en) * | 2004-03-01 | 2011-01-26 | 新日本製鐵株式会社 | High-precision tensile or compressive load measuring device for strain rate of high-speed deformation |
| CN101762421B (en) * | 2010-02-09 | 2011-05-25 | 邱平 | Direct pulling device and method for detecting compressive strength of concrete |
| CN203337463U (en) * | 2013-07-22 | 2013-12-11 | 建研科技股份有限公司 | Instrument for detecting concrete crushing strength by utilizing pulling and stripping method |
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Inventor after: Zhu Yuewu Inventor after: Qiu Ping Inventor after: Han Chunlei Inventor after: Zhang Zuodong Inventor after: He Jitao Inventor after: Zhang Xiaodong Inventor after: Zhu Liying Inventor after: Zhu Junfeng Inventor before: Zhu Yuewu Inventor before: Qiu Ping Inventor before: Zhu Liying Inventor before: Zhu Junfeng |
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Effective date of registration: 20160303 Address after: 100028 Beijing, North Third Ring Road, No. 30 East Road, Chaoyang District Patentee after: CABR Technology Co., Ltd. Patentee after: LANGFANG CITY SUNSHINE CONSTRUCTION QUALITY INSPECTION CO., LTD. Patentee after: Shenzhen Institute of China Academy of Building Research Construction Technology Co., Ltd. Address before: 100013 Chaoyang District, China, North Third Ring Road, No. 30, China Construction Research Institute, Beijing Patentee before: CABR Technology Co., Ltd. Patentee before: Shenzhen Institute of China Academy of Building Research Construction Technology Co., Ltd. |
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Effective date of registration: 20170112 Address after: 100013 Beijing, North Third Ring Road, No. 30 East Road, Chaoyang District Patentee after: CABR Technology Co., Ltd. Patentee after: LANGFANG CITY SUNSHINE CONSTRUCTION QUALITY INSPECTION CO., LTD. Address before: 100028 Beijing, North Third Ring Road, No. 30 East Road, Chaoyang District Patentee before: CABR Technology Co., Ltd. Patentee before: LANGFANG CITY SUNSHINE CONSTRUCTION QUALITY INSPECTION CO., LTD. Patentee before: In the Construction of Hospital Building Technology |