CN103822826A - 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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- CN103822826A CN103822826A CN201310307757.0A CN201310307757A CN103822826A CN 103822826 A CN103822826 A CN 103822826A CN 201310307757 A CN201310307757 A CN 201310307757A CN 103822826 A CN103822826 A CN 103822826A
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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 detection technique field, particularly a kind of method and instrument that detects concrete crushing strength.
Background technology
At present conventional concrete strength detection technique and method have Non-Destructive Testing and breakage to detect two kinds.Described Non-Destructive Testing is divided into rebound method, overall approach, ultrasonic method etc., and it is to utilize 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 damaged detection is divided into again core drilling method, rear-extraction method, penetration method, rear anchoring method, pulling out method etc., it is the test specimen mechanics parameter conversion concrete strength that utilizes regulation, damaged testing result precision is higher, but concrete is damaged large, and exist operation many, 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 are processed 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 because adopting epoxy resin will draw support mechanism and core bonding, affected greatly by temperature factor, running time is long, after need to being dried intensity to be generated, just can operate, therefore should there is slippage, also can produce environmental pollution simultaneously.
Summary of the invention
The object of this invention is to provide a kind of can Non-Destructive Testing concrete, there is the method that pulls that testing result precision is high and detect again method and the instrument of concrete crushing strength.
For achieving the above object, the present invention adopts following technical scheme: a kind of method that pulls method detection concrete crushing strength, it is characterized in that step is as follows: step 1, in detected concrete, select N position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, then with the instrument that pulls method detection concrete crushing strength, all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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 by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, this concrete crushing strength is called again concrete Conversion 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 1, can be first in detected concrete, to select a position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, detect the instrument of concrete crushing strength by the method that pulls this concrete core sample is carried out to pull-off test, record the stretching resistance peak value that this concrete core sample is pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of this concrete core sample according to concrete strength-measuring formula, it is the 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 concrete Conversion strength.
In described step 1, also can be first in detected concrete, to select N position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, and then detect the instrument of concrete crushing strength by the method that pulls all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, finally obtain N concrete Conversion strength.
A kind of method that pulls being applied in the above-mentioned method that pulls method detection concrete crushing strength detects the instrument of concrete crushing strength, by drawing rest device and data collector to form, describedly draw rest device to include 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, it is characterized in that:
Described boosting mechanism comprises reducer shell, be arranged in reducer shell and input end through reducer shell to the external worm screw of reducing gearbox, to be arranged in reducing gearbox external and drive with the input end of worm screw the reductor handle that is connected, be arranged on reducer shell and with the worm gear of worm mesh and be inserted in the spline of 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 that is fixed on reducer shell upper surface, is fixed on the swivel sleeve of pressure transducer upper end and takes the gland nut being placed on swivel sleeve, transmission rod on described spline is from bottom to top successively through after reducer shell, pressure transducer and swivel sleeve, and takes the gland nut being placed on swivel sleeve and is threaded;
The described support mechanism that draws comprises that upper end is from the bottom to top through reducer shell and be threaded in the lifting rod in the screw of spline, be threaded in the lift block of lifting rod bottom, be positioned at lifting rod below and be evenly equipped with the shaft collar of at least three group shaft collar connecting links, be positioned at below shaft collar and by arc clamping head and be located at least three lobe claws that the claw connecting link on arc clamping head lateral wall forms, and the linkage assembly that lift block, shaft collar and claw are linked together;
Described linkage assembly has three groups at least, every group of linkage assembly includes 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 and the upper end of lever arm of force are articulated and connected, 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 of balance stem is articulated and connected and is articulated and connected on claw connecting link at shaft collar connecting link upper and lower end.
Described reaction frame is at least three support bars that are connected on reducer shell lower surface.
Described boosting mechanism also can comprise the shaft block ring on the transmission rod that is enclosed within gland nut top.
Described pressure sensitive mechanism also can comprise the swivel sleeve gland bonnet that is threaded in swivel sleeve upper end.
The described support mechanism that draws also can comprise the slotted nut that is threaded in lifting rod lower end, and the upper surface of this slotted nut is pressed on the lower surface of lift block.
Describedly draw rest device also can comprise to be connected to the shell body on linkage assembly and to be connected to the shell fixed head between two adjacent shell bodies.
The lower end of described support bar can be provided with ball joint head, have one relatively the adjusting supporting leg of ball joint head universal rotational be 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 can Non-Destructive Testing concrete, there is the method that pulls that testing result precision is high and detect again the method and apparatus of concrete crushing strength.
A kind of method that detects normal concrete compressive strength when the described method that pulls method detection concrete crushing strength,, with special concrete pulling off apparatus, concrete core sample is axially applied to the pulling-out force perpendicular to pressure-bearing surface, make tension core pull vertically destruction, and according to the detection method that pulls tension and come establish concrete strength.
Describedly pull method to detect the method for concrete crushing strength very little to the damage of detected concrete, drilling depth in detected concrete is only millimeter rank (40mm～45mm), so be applicable to detecting the concrete of Reinforcing Bar with Dense Disposition, belong to concrete Non-Destructive Testing new technique.
Described pull method that method detects concrete crushing strength for be the detection of the internal intensity of detected concrete, its measuring accuracy is higher than classic method, easy to detect quick.
Described pull method detect concrete crushing strength method detect the length of time scope wide, all tensile test pieces that can drill moulding are all suitable for, the applicable age of concrete can be to 14 days, can be the stretch-draw of prestressed concrete and put and the early construction in the length of time of concrete provides technical data.
The described detection that pulls method and detect the method for concrete crushing strength and be applicable to the Structural Engineering concrete strength of C10-C100, has advantages of that operation is few, simple to operation, accurate quick, cost is low, applicability is strong.
The described method that pulls method detection concrete crushing strength is not particularly limited the shape of detected concrete, the restriction of test position is less, detected concrete does not need any processing processing (surface of on-the-spot test position is without processing, and the concrete core sample being drilled to does not need to process yet).
The described method that pulls method detection concrete crushing strength can detect concrete compressive strength, have substantial different from current existing other concrete strength detecting methods, there is good application value, can better improve and enrich concrete strength detection technique.
Described pull method detect the instrument of concrete crushing strength and have simply, fast, do not need to test specimen process,, the feature that can detect the concrete crushing strength in the different length of times little to structural damage.
(application publication number is CN102866056A for draw rest device and the straight pulling device of pull-type in the described instrument that pulls method detection concrete crushing strength, Shen Qing Publication day is the Chinese patent application of on 01 09th, 2013) compare, there is following some benefit: 1, the rotational plane of torque handle and the moving direction of lifting rod in the straight pulling device of pull-type are vertical, under the effect of moment of torsion, the concrete core sample being lifted can bear certain moment of torsion, so there is the danger being twisted off, and the direction that the rotational plane that the method that pulls detects the reductor handle in the instrument of concrete crushing strength moves with lifting rod is parallel, so concrete core sample is not produced the trend of moment of torsion, therefore the concrete core sample being lifted is stressed better, the danger not twisted off, 2, pull method and detect boosting mechanism in the instrument of concrete crushing strength and can control and draw support mechanism clamp or unclamp, and the speed that clamps or unclamp, and the straight pulling device of pull-type is not all right, 3, pulling the boosting mechanism that method detects in the instrument of concrete crushing strength uses more laborsaving, 4, pulling method, to detect the structure of instrument of concrete crushing strength compacter, more reasonable, more good-looking.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is that the master who pulls the instrument of method detection concrete crushing strength looks schematic diagram.
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 that the master of reductor handle looks schematic diagram.
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 method that pulls method detection concrete crushing strength, its step is as follows: step 1, in detected concrete, select N position to pull test specimen position as what drill concrete core sample (being core test specimen), drill columniform concrete core sample (in the present embodiment at the test specimen position that pulls of choosing, adopt internal diameter Φ 44mm, the hollow boring bit of external diameter Φ 54mm drills), then with the instrument that pulls method detection concrete crushing strength, all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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 by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, this concrete crushing strength is called again concrete Conversion strength, step 2, the N obtaining in above-mentioned steps concrete Conversion strength added up, then divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, the i.e. 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 1, can be first in detected concrete, to select a position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, detect the instrument of concrete crushing strength by the method that pulls this concrete core sample is carried out to pull-off test, record the stretching resistance peak value that this concrete core sample is pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of this concrete core sample according to concrete strength-measuring formula, it is the 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 concrete Conversion strength.
In described step 1, also can be first in detected concrete, to select N position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, and then detect the instrument of concrete crushing strength by the method that pulls all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, finally obtain N concrete Conversion strength.
The described test specimen position that pulls is evenly arranged in detected concrete, and adjacent two distances that pull between test specimen position are not less than 30mm, pulls test specimen position and is not less than 25mm apart from the end limit of detected concrete.The diameter of described concrete core sample is that in general 38mm～49mm(is 38mm, 44mm or 49mm), length is 40mm～45mm.Described concrete core sample is the concrete core sample linking together with detected concrete.
Shown in Fig. 1-3, the described instrument that pulls method detection concrete crushing strength, by drawing rest device and data collector to form, describedly draw rest device to include 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.
Referring to 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(being connected referring to Figure 13, Figure 14 with the input end of worm screw), be arranged on reducer shell and the worm gear 4 engaging with worm screw 2 and the spline 5 that is 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 gland nut 8 tops, 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.
Referring to Fig. 1-3, Fig. 4, Fig. 7, in the present embodiment, described pressure sensitive mechanism comprises the pressure transducer 6 that is fixed on reducer shell upper surface, is fixed on the swivel sleeve 7 of pressure transducer 6 upper ends and takes the gland nut 8 being placed on swivel sleeve 7, transmission rod 5.1 on described spline 5 is from bottom to top successively through after reducer shell 1, pressure transducer 6 and swivel sleeve 7, and takes the gland nut 8 being placed on swivel sleeve 7 and is threaded; In the present embodiment, pressure sensitive mechanism also comprises the swivel sleeve gland bonnet 10 that is threaded in swivel sleeve 7 upper ends.
Referring to Fig. 1-4, Fig. 7, in the present embodiment, the described support mechanism that draws comprises that upper end is from the bottom to top through reducer shell and be threaded in the lifting rod 11 in the screw 5.2 of spline 5, be threaded in the lift block 12(of lifting rod 11 bottoms referring to Figure 10), be positioned at lifting rod below, and be evenly equipped with the shaft collar 13(of at least three group shaft collar connecting links 13.1 referring to Figure 11), be positioned at shaft collar below, and by arc clamping head 14.1 and be located at least three lobe claw 14(that the claw connecting link 14.2 on arc clamping head lateral wall forms referring to 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 ends, and the upper surface of this slotted nut 18 is pressed on the lower surface of lift block 12.
Referring to Fig. 4, Fig. 7, in the present embodiment, described linkage assembly has three groups at least, every group of linkage assembly includes 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 upper end of the other end of force-guided stem 15 and lever arm of force 16 is articulated and connected, 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 of balance stem 17 is articulated and connected on shaft collar connecting link 13.1, lower end is articulated and connected on claw connecting link 14.2,
Referring to Fig. 1-4, Fig. 7, in the present embodiment, described reaction frame is at least three support bars 19 that are connected 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.
Referring to Fig. 4, Fig. 7, in the present embodiment, the lower end of support bar 19 is provided with ball joint head 19.1, have one relatively the adjusting supporting leg 20 of ball joint head universal rotational be connected on ball joint head by spring clip 21.The axis of the axial line that described adjusting supporting leg 20 is a kind of adjustable lifting rods and concrete core sample (core test specimen) is always the multi-axis foot of 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, drawing rest device also to comprise by Phillips head bolts 28 is connected to shell body 22 on linkage assembly and is connected to shell fixed head 23(between two adjacent shell bodies 22 referring to 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 is a kind of instrument that pulls of being furnished with digital acquisition device, it is a kind of universal portable push-pull effort testing tool, be on market, purchase available, have that volume is little, lightweight, portable, function is many, precision is high, can curve catch full test process, the feature such as simple to operate, multiple functional, be applicable to push-pull effort test, contact engaging and separating force test, destructive test of various products etc., and can form in conjunction with various tester tables and fixture the small-scale test machine of different purposes.
In other embodiments, the rest device that draws that the method that pulls described in detects in the instrument of concrete crushing strength also can replace to the straight pulling device of pull-type (application publication number is CN102866056A, Shen Qing Publication day to be the Chinese patent application of on 01 09th, 2013).
Employing pulls the instrument of method detection concrete crushing strength and tests: 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 zero clearing, the reductor handle 3(that turns clockwise is also afterburning handle), when lifting rod is mentioned, the arc clamping head of claw clamps concrete core sample, the instrument numeral of data collector is in the time being not more than 10N, adjust counter-force bar, it is fully contacted with detected concrete surface layer, and the axial bus of adjusting three lobe claws and concrete core sample is on same axis, continue rotation reductor handle 3, lifting rod continues to promote, utilize lever principle, move up by lifting rod, three force-guided stems that are connected with lifting rod, outwards promote lever arm of force, lever arm of force makes the lower end of lever arm of force inwardly rotate take the fulcrum of shaft collar as axle center, the lower end of lever arm of force promotes arc clamping head and inwardly shrinks together with balance stem, concrete core sample is implemented to clamping force, clamped concrete core sample stops lifting rod to move up, due to counter-force bar fixed reducer shell and claw between distance, the fastening force clamping after 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 a pulling-out force along axial (identical with lifting rod moving direction) of lifting rod simultaneously, now concrete core sample bears radial pressure, utilize concrete tensile strength to be less than the feature of compressive strength, finally make concrete core sample fracture (or cry pull).When concrete core sample fracture, pull the pulling force peak value of moment by data collector collection concrete core sample and detected concrete.
Owing to having adopted at least three lobe claws, the subtle change of the diameter of concrete core sample, can not affect experiment work.
Described pressure sensitive mechanism adopts special construction, wherein pressure transducer below, is connected with reducer shell, and swivel sleeve is housed above pressure transducer, can effectively pressure variation be passed to data collector.The described data collector being connected in pressure sensitive mechanism can automatic pressure acquisition peak value.
Described boosting mechanism has adopted turbine and worm device, screw on the lower surface of the spline of establishing in turbine is connected with lifting rod, transmission rod on the upper surface of spline is connected with pressure transducer together with swivel sleeve, in the time of 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 because claw is clamped after concrete core sample, can stop the movement of lifting rod, can form a pair of relative counter-force, and axially move because the spline in turbine allows spline, 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.Referring to Fig. 4, Fig. 6, Fig. 7, between swivel sleeve and gland nut, between the upper surface and reducer shell 1 of spline 5, be equipped with bearing washer and thrust bearing 24 between the lower surface of spline 5 and reducer shell 1.Between worm gear 4 and reducer shell, be equipped with deep groove ball bearing 25 between worm screw 2 and reducer shell.Between lifting rod 11 and reducer shell, be provided with linear bearing 26, the upper end of linear bearing 26 is also pressed with linear bearing fixing female 27.
Described pull method detect the method for concrete crushing strength and the key distinction of other detection methods as shown in table 1.
Described pull method detect the method for concrete crushing strength and the main difference of La Tuofa as shown in table 2.
Claims (10)
1. pull the method that method detects concrete crushing strength, it is characterized in that step is as follows:
Step 1, in detected concrete, select N position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, then with the instrument that pulls method detection concrete crushing strength, all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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 by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, this concrete crushing strength is called again concrete Conversion strength,
Step 2, the N obtaining in above-mentioned steps concrete Conversion strength added up, then divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, the i.e. typical value of concrete strength.
2. the method that pulls method detection concrete crushing strength according to claim 1, 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. the method that pulls method detection concrete crushing strength according to claim 1, it is characterized in that: in described step 1, first in detected concrete, select a position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, detect the instrument of concrete crushing strength by the method that pulls this concrete core sample is carried out to pull-off test, record the stretching resistance peak value that this concrete core sample is pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of this concrete core sample according to concrete strength-measuring formula, it is the 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 concrete Conversion strength.
4. the method that pulls method detection concrete crushing strength according to claim 1, it is characterized in that: in described step 1, first in detected concrete, select N position to pull test specimen position as what drill concrete core sample, drill columniform concrete core sample at the test specimen position that pulls of choosing, and then detect the instrument of concrete crushing strength by the method that pulls all concrete core samples are carried out to pull-off test, record the stretching resistance peak value that all concrete core samples are pulled off 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, by the concrete tensile strength substitution concrete strength-measuring formula obtaining, calculate the concrete crushing strength of all concrete core samples according to concrete strength-measuring formula, finally obtain N concrete Conversion strength.
5. one kind is applied in any one in the claims 1 to 4 and pulls the method that pulls in the method that method detects concrete crushing strength and detect the instrument of concrete crushing strength, by drawing rest device and data collector to form, describedly draw rest device to include 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, it is characterized in that:
Described boosting mechanism comprises reducer shell (1), be arranged in reducer shell (1) and input end through reducer shell to the external worm screw of reducing gearbox (2), to be arranged in reducing gearbox external and drive the reductor handle (3) that is connected, be arranged on reducer shell and the worm gear (4) engaging with worm screw (2) and the spline (5) that is inserted in worm gear (4) with the input end of worm screw, 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) that is 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) being placed on swivel sleeve (7), transmission rod (5.1) on described spline (5) is from bottom to top successively through after reducer shell (1), pressure transducer (6) and swivel sleeve (7), and takes the gland nut (8) being placed on swivel sleeve (7) and is threaded;
The described support mechanism that draws comprises that upper end is from the bottom to top through reducer shell and be threaded in the lifting rod (11) in the screw (5.2) of spline (5), be threaded in the lift block (12) of lifting rod (11) bottom, be positioned at lifting rod below, and be evenly equipped with the shaft collar (13) of at least three group shaft collar connecting links (13.1), be positioned at shaft collar below, and by arc clamping head (14.1) be located at least three lobe claws (14) that claw connecting link (14.2) on arc clamping head lateral wall forms, 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, every group of linkage assembly includes 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 upper end of the other end of force-guided stem (15) and lever arm of force (16) is articulated and connected, 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 of balance stem (17) is articulated and connected on shaft collar connecting link (13.1), lower end is articulated and connected on claw connecting link (14.2),
Described reaction frame is for being connected at least three support bars (19) on reducer shell (1) lower surface.
6. the instrument that pulls method detection concrete crushing strength according to claim 5, is characterized in that: described boosting mechanism also comprises the shaft block ring (9) on the transmission rod (5.1) that is enclosed within gland nut (8) top.
7. the method that pulls according to claim 5 detects the instrument of concrete crushing strength, it is characterized in that: described pressure sensitive mechanism also comprises the swivel sleeve gland bonnet (10) that is threaded in swivel sleeve (7) upper end.
8. the instrument that pulls method detection concrete crushing strength according to claim 5, 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).
9. the method that pulls according to claim 5 detects the instrument of concrete crushing strength, it is characterized in that: described in the shell body (22) that draws rest device also to comprise to be connected on linkage assembly and be connected to the shell fixed head (23) between adjacent two shell bodies (22).
10. the instrument that pulls method detection concrete crushing strength according to claim 5, it is characterized in that: the lower end of described support bar (19) is provided with ball joint head (19.1), have one relatively the adjusting supporting leg (20) of ball joint head universal rotational be 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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Cited By (8)
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| CN104165804A (en) * | 2014-09-02 | 2014-11-26 | 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 |
| CN110501227A (en) * | 2019-09-23 | 2019-11-26 | 朱跃武 | A kind of expanding wedge type draw-off gear and Hubbing method |
| CN110553901A (en) * | 2019-09-19 | 2019-12-10 | 湖南大学 | anchoring part complete device for detecting strength by post-installation pulling-out method and detection method |
| CN110954406A (en) * | 2019-12-19 | 2020-04-03 | 天台婉枫电子有限公司 | High alumina porcelain insulating material mechanical strength check out test set |
| WO2022165371A1 (en) * | 2021-02-01 | 2022-08-04 | Eliash Michael R | System, apparatus, and method for removing a portion of a structure |
| 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 |
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| CN110954406A (en) * | 2019-12-19 | 2020-04-03 | 天台婉枫电子有限公司 | High alumina porcelain insulating material mechanical strength check out test set |
| WO2022165371A1 (en) * | 2021-02-01 | 2022-08-04 | Eliash Michael R | System, apparatus, and method for removing a portion of a structure |
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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 |