CN116929924A - Concrete bonding strength testing device and testing method thereof - Google Patents
Concrete bonding strength testing device and testing method thereof Download PDFInfo
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- CN116929924A CN116929924A CN202310809688.7A CN202310809688A CN116929924A CN 116929924 A CN116929924 A CN 116929924A CN 202310809688 A CN202310809688 A CN 202310809688A CN 116929924 A CN116929924 A CN 116929924A
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- 239000004567 concrete Substances 0.000 title claims abstract description 132
- 238000012360 testing method Methods 0.000 title claims abstract description 97
- 238000005553 drilling Methods 0.000 claims abstract description 128
- 239000011435 rock Substances 0.000 claims abstract description 24
- 230000008093 supporting effect Effects 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000004873 anchoring Methods 0.000 claims description 23
- 239000011378 shotcrete Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 11
- 238000007711 solidification Methods 0.000 abstract description 9
- 230000008023 solidification Effects 0.000 abstract description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract description 6
- 235000017491 Bambusa tulda Nutrition 0.000 abstract description 6
- 241001330002 Bambuseae Species 0.000 abstract description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract description 6
- 239000011425 bamboo Substances 0.000 abstract description 6
- 210000003205 muscle Anatomy 0.000 abstract 3
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000009527 percussion Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a concrete bonding strength testing device and a testing method thereof, belonging to the technical field of concrete bonding strength detection, wherein the testing device comprises a core barrel, a supporting seat, a fixed hack lever, a control switch and a drilling motor; the utility model discloses a concrete strength test device, including boring core section of thick bamboo, boring core section of thick bamboo's lower extreme opening part, hollow cylindric structure in inside and, a plurality of core pulling grooves have evenly been seted up on the same high position of boring core section of thick bamboo inboard circular arc wall, evenly set up a plurality of drills on the ring face of boring core section of thick bamboo lower extreme opening part, boring core section of thick bamboo's upper end is sealed, can be at the bonding strength to concrete and rock stratum without planting the muscle to the concrete, consequently just also need not wait for planting the solidification of muscle, effectively shorten test time and engineering construction time, need not use rig and impact drill again, the operation is more convenient, and direct test concrete's intensity, test object is direct, avoids through planting muscle indirect test intensity to this device is more accurate to the intensity test of concrete.
Description
Technical Field
The invention relates to the technical field of concrete bonding strength detection, in particular to a concrete bonding strength testing device and a testing method thereof.
Background
The sprayed concrete is widely applied to geotechnical engineering, tunnel engineering, municipal engineering, slope engineering and the like as a common form of engineering support. The sprayed concrete has the advantages of simple construction, rapid early strength improvement, good impermeability and the like, and particularly can fill gaps and surface recesses of rock mass, the separated stress surfaces are bonded together again, the sprayed layer and surrounding rock are adhered to form a common working surface, the resistance and supporting effect of a structural surface are improved, the stress concentration phenomenon of the sprayed structure is avoided or alleviated, and the stability and safety of the structure can be greatly improved. Therefore, the bond strength between the shotcrete and the surrounding rock is an important parameter for evaluating whether the shotcrete can sufficiently function.
The concrete strength after coagulation can be continuously constructed after detection, the current field detection method mainly uses a core drilling and drawing method, and the main operation steps of the current core drilling and drawing method are as follows: 1. selecting a test position, drilling by adopting a drilling machine perpendicular to the sprayed concrete layer and penetrating into surrounding rock by more than 20mm, and forming a cylindrical core sample with a sprayed concrete and surrounding rock bonding surface; 2. disassembling the drilling machine; 3. planting bars at the test position by using an impact drill, taking the bars as force transmission bars for a drawing test, waiting for solidification of binders for bar planting, solidifying after about 7-14 days, and then carrying out the drawing test; 4. installing a drawing instrument, and slowly applying a pulling force to the steel bar until the core sample is damaged along the joint surface of the sprayed concrete and the surrounding rock; 5. the bond strength of the shotcrete to the surrounding rock was calculated by the tensile force and the cross-sectional area of the fracture.
The method has more defects, the common core driller can only core, the gap formed after the core is cored is smaller, the core barrel is provided with no fixed core sample device and drawing equipment, and the drawing test can not be directly carried out after the core is cored, so that the test operation steps are increased, and the time and the labor are wasted; the existing detection method has low detection precision, the steel bar is not required to be planted in advance, the sprayed concrete is not directly subjected to drawing test, the steel bar planted also has certain strength and ductility, the steel bar planted is drawn, deviation of test data of the bonding strength of the concrete can be caused, the steel bar planted is difficult to position and is located at the center of a core sample, eccentric tension is often caused, the deviation of a detection result is large, and the steel bar planted is easy to loosen, so that the test fails; the operation is complex, the use equipment is more, the labor is more, the drilling machine, the impact drill, the drawing instrument and the like are involved, the equipment is not integrated, and the working efficiency is greatly reduced; the bar planting solidification needs to be waited, so that the time consumption is long, the preparation work is complex, the related equipment is repeatedly used, and the turnover time is wasted; and the test can be started only when the bonding material of the reinforcing bars is required to reach a certain strength, and when the reinforcing bars are used in the early stage, all projects need to wait for the bonding strength result of the concrete and the rock stratum and then carry out subsequent construction, so that the construction progress of the whole project is influenced. There is a need for a way to test the strength of concrete with higher accuracy, less time and simple construction.
Based on the above, the invention designs a concrete bonding strength testing device and a testing method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a concrete bonding strength testing device and a testing method thereof, which can test the bonding strength of concrete and rock stratum without planting bars on the concrete, so that the solidification of the bar planting is not needed, the testing time and the engineering construction time are effectively shortened, a drilling machine and a percussion drill are not needed, the operation is more convenient, the strength of the concrete is directly tested, and a test object is directly used for avoiding the indirect strength test through the bar planting, thereby the device is more accurate in strength test of the concrete.
The invention is realized in the following way: a concrete bond strength testing device, comprising:
the drilling device comprises a drilling core barrel, a supporting seat, a fixed hack lever, a control switch, an anchoring seat and a drilling motor;
the drill core barrel is of a cylindrical structure with an opening at the lower end and a hollow inside, a plurality of core pulling grooves are uniformly formed in the same height position of the circular arc wall at the inner side of the drill core barrel, a plurality of drill bits are uniformly arranged on the circular ring surface at the opening at the lower end of the drill core barrel, the upper end of the drill core barrel is closed, and a connecting block is fixedly arranged at the outer part of the upper end of the drill core barrel;
a core pulling fixture block is rotatably arranged in each core pulling groove, a positioning block is further arranged in each core pulling groove, the upper end of each positioning block is connected with an adjusting rod, the upper end of each adjusting rod extends out of the top of the core drilling barrel, each adjusting rod can be vertically arranged in the wall of the core drilling barrel, and each adjusting rod is locked with the core drilling barrel through an adjusting nut;
the positioning block is clamped between the bottom of the core pulling groove and the inner side surface of the core pulling clamping block, and the upper end of the core pulling clamping block and the positioning block can mutually extrude and retract to extend out of the hollow hole of the core drilling barrel;
the support seat is a stable frame, a dynamometer is stably erected in the support seat, a drilling motor is detachably locked and connected below the dynamometer, and the drilling motor is locked and connected and installed on the connecting block;
the anchoring seats are stably erected bases, the two anchoring seats can be locked on a concrete surface to be detected in a separated mode, one fixing rack rod is vertically erected at the top of each anchoring seat, one telescopic rod is vertically telescopic at the top of each fixing rack rod, a lifting frame is horizontally erected between the two telescopic rods on the two anchoring seats, the control switch is a controller of the two telescopic rods, and the supporting seats are fixedly arranged on the lifting frame;
the axis of the drill core barrel, the driving shaft of the drilling motor and the drawing direction of the dynamometer are overlapped, and the fixing rack rod and the axis of the drill core barrel are parallel on the same vertical plane.
Further, the adjusting nut is arranged outside the top end of the drill core barrel, the upper end of the adjusting rod is locked with the adjusting nut through threads, and the adjusting rod is locked and lifted in the wall of the drill core barrel through rotation of the adjusting nut;
the positioning block is a sphere, the core pulling clamping block is a wedge block, the tip end of the core pulling clamping block faces the upper end of the drill core barrel, the inner side surface of the core pulling clamping block is a cambered surface with a large upper part and a small lower part, the sum of the diameter of the positioning block and the thickness of the upper end of the core pulling clamping block is larger than the depth c of the core pulling groove, and the sum of the diameter of the positioning block and the thickness of the lower end of the core pulling clamping block is smaller than the depth c of the core pulling groove;
the core pulling groove is provided with a rotating pin, the rotating pin is perpendicular to the axis of the core drilling barrel in the same vertical plane, and the core pulling clamping block can be transversely overturned towards the inside of the core drilling barrel through the rotating pin and is arranged in the core pulling groove.
Further, the drill bit is obliquely arranged in the hollow hole of the drill core barrel, the drill bit stretches into the drill core barrel hole, the length of the drill bit stretching into the inner hole of the drill core barrel is d, and d is not more than 2cm;
the length of the core pulling clamping block extending into the inner wall of the core pulling groove is s, and the length d is smaller than s.
Further, a water inlet hole is formed in the closed end of the drill core barrel, and the water inlet hole is communicated between the outer part of the upper end of the drill core barrel and the hollow inner hole.
Further, the outer end of the connecting block is provided with a threaded hole, a driving rod is arranged on a driving shaft of the drilling motor, and the connecting block is in threaded locking connection with the driving rod.
Further, the dynamometer is an anchor rod drawing instrument, a drawing end of the dynamometer is connected with a drawing piece, the drawing piece is tightly locked with a drilling motor, and the pulling direction of the dynamometer, the drawing piece and a driving shaft of the drilling motor are in the same straight line.
Further, the fixed hack lever and the telescopic link constitute complete telescopic link, the both sides of crane are locked at the top of both sides telescopic link, two the telescopic link is parallel to each other, two the telescopic link is synchronous vertical flexible.
A concrete bonding strength test method, this preservation method needs to provide a concrete bonding strength test device, this method includes the following steps:
step 1, selecting a flat concrete surface to be subjected to strength test, and delineating a defect-free part of the concrete surface;
step 2, attaching the bottoms of the two anchor seats to a concrete surface, enabling the fixing rack rod to be perpendicular to the concrete surface, moving the positions of the anchor seats, enabling the opening ends of the drill core barrel to be opposite to the selected concrete test position, and locking the anchor seats on the concrete surface by using expansion screws after determining the fixing positions of the anchor seats;
step 3, adjusting the position of the adjusting rod to enable the lower ends of the positioning block and the core pulling clamping block to be abutted, so that the core pulling clamping block and the positioning block are not mutually extruded, and the core pulling clamping block is retracted into the core pulling groove;
step 4, starting a drilling motor, wherein the drilling motor drives a core drilling barrel to start rotating drilling, water is injected into a water inlet hole at the same time, water flows out from the opening end of the core drilling barrel, a control switch is started to control a telescopic rod to translate along a fixing rack rod towards a concrete surface to approach, and a drill bit at the opening end of the core drilling barrel starts drilling a core for the concrete surface to be tested;
step 5, after the core barrel drills to a preset depth, the drilling motor is turned off, the core barrel stops drilling, water is injected into the water inlet hole, and at the moment, concrete is annularly cut into a cylindrical core sample by the opening end face of the core barrel;
step 6, rotating an adjusting nut outside the top end of the core barrel, pulling the adjusting rod to translate towards the upper end by the adjusting nut, and enabling the positioning block to translate towards the upper end along with the adjusting rod until the positioning block and the upper end of the core pulling clamping block are mutually abutted, enabling the tip end part of the core pulling clamping block positioned above to be ejected into a hollow hole inside the core barrel by the positioning block, enabling the tip end of the core pulling clamping block to extend out of a side wall for clamping a core sample, and sequentially and symmetrically adjusting all the core pulling clamping blocks to clamp the core sample through a plurality of core pulling clamping blocks;
step 7, starting a dynamometer, wherein the dynamometer starts to apply drawing force to a drilling motor, the drilling motor directly transmits the drawing force to a core drilling barrel, the core drilling barrel draws a concrete core sample through a plurality of core drawing clamping blocks, and when the dynamometer detects that the drawing force is not increased any more, the maximum force value is recorded, and then the dynamometer is closed;
step 8, then knob adjusting nuts, loosening the core pulling clamping blocks through adjusting rods to enable the core drilling barrel to be loosened and separated from the concrete core sample, and then disassembling the anchoring seat to enable the anchoring seat to be separated from the concrete testing surface, so that the bonding strength test of the concrete and the rock stratum at a selected position is completed;
step 9, every 1000m 2 The sprayed concrete surface is at least tested for 6 adhesive strength, and sampling positions are randomly and uniformly distributed.
Further, the depth h of the core pulling clamping block clamped with the concrete core sample is smaller than the total thickness of the sprayed concrete layer by 10cm.
The beneficial effects of the invention are as follows: 1. according to the invention, the core sample is drilled on the concrete surface through the core drilling barrel, and then the core sample is directly drawn, so that drilling and bar planting on the tested concrete surface are not required, bar planting solidification is not required, the detection time is short, the detection operation is simple, the subsequent construction can be directly carried out after the test is finished, and the positive effect on shortening the construction period is realized;
2. the device does not need to use a percussion drill or a drilling machine for coring, is simpler and more convenient to operate, and improves the working efficiency in terms of the number of operators;
3. the device is used for directly testing the concrete core sample instead of carrying out the drawing test on the planted bars, so that the direct test on the bonding strength of the concrete and the rock stratum is realized, the test object is more direct, the test result is more accurate, the problem that whether the planted bars are positioned in the center of the core sample is not needed to be considered, the device is used for uniformly clamping the side wall of the core sample, the stress of the core sample is more uniform, and the problem that the planted bars are inclined and inclined due to the eccentric stress is avoided.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall assembly structure of the present invention;
FIG. 2 is a top view of the overall assembly of the present invention;
FIG. 3 is a schematic view of the internal structure of the drill core barrel of the present invention;
FIG. 4 is a schematic diagram showing the distribution of the core drawing grooves on the side wall of the core barrel;
FIG. 5 is a schematic view of the pull-out latch of the present invention retracted within the pull-out slot;
FIG. 6 is a schematic view showing the state that the core pulling clamping block extends out of the core pulling groove;
FIG. 7 is a schematic view of the drill bit distribution of the core barrel of the present invention;
fig. 8 is a schematic diagram of the front structure of the core pulling block in the core pulling groove of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
the drilling machine comprises a 1-drilling core barrel, a 11-core pulling groove, a 111-core pulling clamping block, a 112-adjusting nut, a 113-positioning block, a 114-adjusting rod, a 115-rotating pin, a 12-drill bit, a 13-connecting block, a 14-water inlet, a 2-supporting seat, a 21-pull-connecting piece, a 22-dynamometer, a 3-fixing rack bar, a 31-telescopic rod, a 32-control switch, a 33-anchoring seat, a 34-lifting frame, a 4-drilling motor and a 41-driving rod.
Detailed Description
Referring to fig. 1 to 8, the present invention provides a technical solution: a concrete bond strength testing device, comprising:
the drilling machine comprises a drilling core barrel 1, a supporting seat 2, a fixed hack lever 3, a control switch 32 and a drilling motor 4;
the lower end of the core barrel 1 is provided with an opening, a hollow cylindrical structure is arranged in the hollow cylindrical structure, a plurality of core pulling grooves 11 are uniformly formed in the same height position of the inner circular arc wall of the core barrel 1, a plurality of drill bits 12 are uniformly arranged on the circular ring surface at the opening of the lower end of the core barrel 1, the upper end of the core barrel 1 is closed, and a connecting block 13 is fixedly arranged outside the upper end of the core barrel 1;
a core pulling clamping block 111 is rotatably arranged in each core pulling groove 11, a positioning block 113 is further arranged in each core pulling groove 11, the upper end of each positioning block 113 is connected with an adjusting rod 114, the upper end of each adjusting rod 114 extends out of the top of the core barrel 1, the adjusting rods 114 are arranged in the barrel wall of the core barrel 1 in a vertically lifting manner, and the adjusting rods 114 are locked with the core barrel 1 through adjusting nuts 112;
the positioning block 113 is clamped between the bottom of the core pulling groove 11 and the inner side surface of the core pulling clamping block 111, and the upper end of the core pulling clamping block 111 and the positioning block 113 can mutually extrude and retract to extend out of the hollow hole of the core barrel 1;
the supporting seat 2 is a stable frame, a dynamometer 22 is stably erected in the supporting seat 2, a drilling motor 4 is detachably locked below the dynamometer 22, and the drilling motor 4 is locked and installed on the connecting block 13;
the anchoring seats 33 are stably erected bases, the two anchoring seats 33 can be locked on the surface of the concrete to be detected in a separated mode, two anchoring seats 33 are arranged, one fixing frame rod 3 is vertically erected at the top of each anchoring seat 33, one telescopic rod 31 is vertically telescopic at the top of each fixing frame rod 3, a lifting frame 34 is horizontally erected between the two telescopic rods 31 on the two anchoring seats 33, the control switch 32 is a controller of the two telescopic rods 31, the supporting seat 2 is fixedly arranged on the lifting frame 34, the telescopic rods 31 are driven to start and stop through the control switch 32, the supporting seat 2 is fixedly arranged on the lifting frame 34, and a drilling motor of the supporting seat 2 is downwards arranged;
the axis of the drill core barrel 1, the driving shaft of the drilling motor 4 and the drawing direction of the dynamometer 22 are coincident, the fixing rack rod 3 is parallel to the axis of the drill core barrel 1 on the same vertical plane, and the bonding strength of concrete and rock stratum can be tested without planting the reinforcement on the concrete, so that the solidification of the reinforcement is not required to be waited, the solidification time of the reinforcement is shortened, the test time and the engineering construction time are effectively shortened, a drilling machine and an impact drill are not required any more, the operation is more convenient, the strength of the concrete is directly tested, the test object is directly tested, the indirect test strength of the reinforcement is avoided, and the strength test of the concrete by the device is more accurate.
The adjusting nut 112 is arranged at the top of the upper end of the drill core barrel 1, the adjusting rod 114 is a screw rod, and the adjusting rod 114 rotates and rises in the barrel wall of the drill core barrel 1 through threads;
the positioning block 113 is a sphere, the core pulling clamping block 111 is a wedge block, the tip end of the core pulling clamping block 111 is arranged towards the upper end of the drill core barrel 1, the inner side surface of the core pulling clamping block 111 is a cambered surface with a large upper part and a small lower part, the sum of the diameter of the positioning block 113 and the thickness of the upper end of the core pulling clamping block 111 is larger than the depth c of the core pulling groove 11, and the sum of the diameter of the positioning block 113 and the thickness of the lower end of the core pulling clamping block 111 is smaller than the depth c of the core pulling groove 11;
the core pulling groove 11 is provided with a rotating pin 115, the rotating pin 115 and the axis of the core barrel 1 are mutually perpendicular in the same vertical plane, the core pulling clamping block 111 can be transversely overturned towards the inside of the core barrel 1 through the rotating pin 115 and is arranged in the core pulling groove 11, the nut 112 can be adjusted at the outer part of the core barrel 1 through the structure, and the adjusting rod 114 is pulled, so that the position relation between the positioning block 114 and the core pulling clamping block 111 is adjusted, and the core pulling clamping block 111 is adjusted to extend inwards into an inner hole of the core barrel 1, or the core pulling clamping block 111 is retracted into the core pulling groove 11;
the drill bit 12 is obliquely arranged towards the hollow hole of the drill core barrel 1, the drill bit 12 stretches into the hole of the drill core barrel 1, the length of the drill bit 12 stretching into the inner hole of the drill core barrel 1 is d, and d is not more than 2cm;
the length of the core pulling clamping block 111 extending into the inner wall of the core pulling groove 11 is s, and the length d is smaller than s, so that the interior of the core drilling barrel 1 is conveniently separated from a concrete core sample, the force of the concrete is conveniently measured, the core pulling clamping block 111 can clamp and pull the core sample, and the situation that the core sample is loose and cannot be clamped is avoided;
the closed end of the core barrel 1 is provided with a water inlet hole 14, the water inlet hole 14 is communicated between the outer part of the upper end of the core barrel 1 and the hollow inner hole, and not only can the temperature of the drill bit 12 at the lower end of the core barrel 1 be reduced through the water inlet hole 14, but also the excessive internal pressure of drilling can be avoided;
the outer end of the connecting block 13 is provided with a threaded hole, a driving rod 41 is arranged on the driving shaft of the drilling motor 4, and the connecting block 13 is in threaded locking connection with the driving rod 41, so that the connection and the driving of the drilling motor 4 are facilitated, and the drilling of the concrete surface is facilitated;
the force measuring instrument 22 is an anchor rod drawing instrument, the drawing end of the force measuring instrument 22 is connected with the pull-connecting piece 21, the pull-connecting piece 21 is tightly locked with the drilling motor 4, the pulling force direction of the force measuring instrument 22, the pull-connecting piece 21 and the driving shaft of the drilling motor 4 are on the same straight line, so that stable drawing test is facilitated, the force measuring is accurate, the numerical value can be recorded, the calculation of the bonding strength parameter of the required concrete and the rock stratum is facilitated, the axis is coincident, the pulling force direction is accurate, and the deflection is avoided;
the fixed hack lever 3 and the telescopic link 31 form complete telescopic link, can be electric telescopic link, also can be hydraulic telescopic link, can even be the lead screw elevating system commonly used, only need can accord with this device working strength and environmental requirement can, the crane 34 is erected on the fixed hack lever 3 through telescopic link 31 horizontally and is gone up and down, and telescopic link 31 is flexible of being convenient for, does not influence the lift of crane 34 again to with crane 34 drive lift.
A concrete bonding strength test method, this preservation method needs to provide a concrete bonding strength test device, this method includes the following steps: step 1, selecting a flat concrete surface to be subjected to strength test, and delineating a defect-free part of the concrete surface;
step 2, attaching the bottoms of the two anchor seats 33 to a concrete surface, enabling the fixing frame rod 3 to be perpendicular to the concrete surface, moving the position of the anchor seats 33, enabling the opening end of the core barrel 1 to be opposite to a selected bonding strength test part of concrete and rock stratum, determining the fixing position of the anchor seats 33, and locking the anchor seats 33 on the concrete surface by using expansion screws;
step 3, adjusting the position of the adjusting rod 114 to enable the lower ends of the positioning block 113 and the core pulling clamping block 111 to be abutted, so that the core pulling clamping block 111 and the positioning block 113 are not mutually extruded, and the core pulling clamping block 111 is retracted into the core pulling groove 11;
step 4, starting a drilling motor 4, wherein the drilling motor 4 drives a core drilling barrel 1 to start rotating drilling, simultaneously injecting water into a water inlet 14 to ensure water to flow out of the opening end of the core drilling barrel 1, starting a control switch 32 to control a telescopic rod 31 to translate along a fixed hack lever 3 towards a concrete surface to approach, and starting a drill bit 12 at the opening end of the core drilling barrel 1 to drill a core of the concrete surface to be tested;
step 5, after the core barrel 1 drills to a preset depth, the depth h of the core pulling clamping block 111 is smaller than the total thickness of the sprayed concrete by 10cm, namely the depth h of the core pulling clamping block 111 clamped with the concrete core sample is smaller than the total thickness of the sprayed concrete by 10cm, but the total depth of drilling is not lower than 2cm, the depth of the drill bit of the whole core barrel 1 drills into a rock wall is not less than 2cm, the drilling motor 4 is closed, the core barrel 1 stops drilling, water injection into the water inlet hole 14 is stopped, at the moment, the concrete is annularly cut into a cylindrical core sample by the opening end face of the core barrel 1, namely the deepest part of the core sample is a rock body, and the thickness of the rock body is not less than 2cm;
step 6, rotating an adjusting nut 112 outside the top end of the core barrel 1, wherein the adjusting rod 114 is pulled by the adjusting nut 112 to translate towards the upper end, the positioning block 113 follows the adjusting rod 114 to translate towards the upper end until the positioning block 113 and the upper end of the core pulling clamping block 111 are mutually abutted, the positioning block 113 ejects the tip part of the core pulling clamping block 111 above into a hollow hole inside the core barrel 1, the tip of the core pulling clamping block 111 extends out of the side wall for clamping a core sample, and sequentially and symmetrically adjusts all the core pulling clamping blocks 111 to clamp the core sample through a plurality of core pulling clamping blocks 111;
step 7, starting a force measuring instrument 22, wherein the force measuring instrument 22 starts to apply drawing force to a drilling motor 4, the drilling motor 4 directly transmits the drawing force to a core barrel 1, the core barrel 1 draws a concrete core sample through a plurality of core drawing clamping blocks 111, and when the force measuring instrument 22 detects that the drawing force is not increased any more, the maximum force value is recorded, and then the force measuring instrument 22 is closed;
step 8, then knob adjusting nut 112, loosening core pulling clamping block 111 through adjusting rod 114 to enable core drilling barrel 1 to be loosened and separated from the concrete core sample, then disassembling anchoring seat 33 to enable anchoring seat 33 to be separated from the concrete testing surface, and completing the bonding strength test of concrete and rock stratum at a selected position;
step 9, every 1000m 2 The sprayed concrete surface is at least tested for 6 adhesive strength, and sampling positions are randomly and uniformly distributed.
In one embodiment of the invention:
the embodiment of the invention provides a concrete bonding strength testing device, and the existing method for testing the bonding strength of concrete and rock stratum by drilling and drawing a drill core is to re-drill and core the solidified concrete, then to plant the bar, and to draw the bar after waiting 7-14 days for the bar planting and the concrete core sample to solidify and then to integrally carry out drawing: 1. the operations of drilling, coring and bar planting solidification are very complicated, and concrete is easy to break in the bar planting process, so that the secondary operation is required, and time and labor are wasted; 2. the test mode is long in time consumption, the firmness of the planted bars is difficult to find immediately, the planted bars are often found to be unqualified when the test is carried out finally, the operation is needed again, and the time consumption is long; 3. the drilling of the bar planting holes is performed by people, so that the drilling cannot be ensured to be accurate, the drilling deflection easily occurs, the deflected bar planting holes can be subjected to uneven stress during drawing, inaccurate drawing force can be directly caused, and larger deviation occurs; 4. the bar planting drawing is not directly carried out the holding drawing on the sprayed concrete core sample, the bar planting also has certain strength and ductility, and the drawing bar planting can lead to the deviation of test data of the concrete bonding strength.
The technical problems solved by the invention are as follows: the concrete surface is directly tested, the concrete surface is drilled through simple equipment, the steel bar planting is not needed, the operation is simpler, the test of the drawing force is immediate, the numerical value can be immediately known, and waiting is not needed.
The technical effects are realized as follows: 1. according to the invention, the core sample is drilled on the concrete surface through the core drilling barrel 1, and then the core sample is directly drawn, so that drilling and bar planting on the tested concrete surface are not required, bar planting solidification is not required, the detection time is short, the detection operation is simple, the subsequent construction can be directly carried out after the test is finished, and the positive effect on shortening the construction period is realized;
2. the device does not need to use a percussion drill or a drilling machine for coring, but uses the core barrel 1 to directly drill the concrete surface, so that the operation is simpler and more convenient, the number of operators is required, and the working efficiency is improved;
3. the device is free from carrying out drawing test on the planted bars, and directly tests the concrete core sample, so that the direct test of the bonding strength of the concrete and the rock stratum is realized, the test object is more direct, the test result is more accurate, the problem that whether the planted bars are positioned in the center of the core sample is not required to be considered, the device clamps the side wall of the core sample uniformly, the stress of the device is more uniform, and the problem that the planted bars are inclined and inclined due to the eccentric stress is avoided.
The technical scheme in the embodiment of the invention aims to solve the problems, and the overall thought is as follows:
in order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
When the invention is manufactured, firstly, the supporting seat 2 of the frame structure is manufactured, the lifting frame 34 is fixed on the supporting seat 2, the lifting frame 34 transversely extends out of two ends of the supporting seat 2, the dynamometer 22 is arranged in the supporting seat 2, the dynamometer 22 is an anchor rod puller, and the pulling end of the dynamometer 22 is also connected with a pull-connecting piece 21;
the anchor rod drawing instrument is a necessary field detection instrument for quality inspection units, is mainly used for detecting the anchoring force of anchoring bodies such as various anchor rods, reinforcing steel bars and the like, and is a necessary field detection instrument for quality inspection units. The anchor rod drawing instrument is mainly used for detecting the anchoring force of various anchoring bodies such as anchor rods, reinforcing steel bars and the like. The anchor rod drawing instrument consists of a manual pump, a hydraulic cylinder, an intelligent digital display pressure gauge, a high-pressure oil pipe with a quick connector, an anchorage device and a portable box, wherein the hydraulic cylinder is hollow and self-resetting, the intelligent digital pressure gauge can directly read the tension value of an anchor rod and has peak value holding, storing and inquiring functions, the anchor rod drawing instrument is particularly suitable for being used on site, the operation is simple, a drawn anchor rod of a dynamometer 22 of the device is a pull-in piece 21, one end of the pull-in piece 21 is locked with the dynamometer 22, the other end of the pull-in piece is sleeved and locked on a machine body of a drilling motor 4, a driving shaft of the drilling motor 4 is a driving rod 41, the driving end of the driving rod 41 is a screw rod, and the driving rod 41 is locked at the closed end of a drill core barrel 1;
the upper end of the device is the closed end of the core barrel 1 in fig. 1, and is also the end of the supporting seat 2, the supporting seat 2 is positioned above the core barrel 1, and the lower end of the device is the end of the drill bit 12, namely the end attached to the concrete surface for drilling.
The device is characterized in that two sets of anchor seats 33 for fixing the device are needed to be manufactured, each anchor seat 33 is a base of a flat plate structure, each anchor seat 33 can be locked on a concrete surface to be tested in a separated mode through expansion bolts, a fixing frame rod 3 is vertically and fixedly arranged on each anchor seat 33, namely, the fixing frame rod 3 needs to be perpendicular to the top plane of each anchor seat 33, the anchor seats 33 need to be attached to a testing surface of the concrete for anchoring and locking, the fixing frame rod 3 needs to be perpendicular to the plane of the anchor seat 33, namely, the fixing frame rod 3 needs to be perpendicular to the concrete surface to be tested, two anchor seats 33 are arranged, one fixing frame rod 3 is vertically erected on the top of each anchor seat 33, one telescopic rod 31 is vertically arranged on the top of each fixing frame rod 3, a lifting frame 34 is horizontally erected between the two telescopic rods 31 on each fixing frame rod 3, each control switch 32 is a controller of the two telescopic rods 31, the supporting seat 2 is fixedly arranged on the lifting frame 34, the lifting frame 34 needs to be perpendicular to the plane of the anchor seat 31, namely, the lifting frame 34 needs to be perpendicular to the fixing frame 31 is required to the plane, the fixing frame rod 31 needs to be perpendicular to the testing surface, the whole lifting frame 31 needs to be fixed to the lifting frame 31, the lifting frame is required to be parallel to the lifting frame 31, and the lifting frame 32 needs to be kept in parallel to the lifting frame 32, and the lifting frame needs to be kept in the lifting frame 32, and the lifting frame needs to be parallel to the fixing frame 31, and the lifting frame 31 needs to be kept to be fixed to be parallel to the lifting frame 31, and the lifting frame 34 is convenient to be kept to be fixed to the lifting frame and the lifting frame 34;
after the erection of the external support and lifting structure is completed, a drill core barrel 1 is manufactured, the drill core barrel 1 is of a cylindrical structure, the upper end of the drill core barrel 1 is closed, the lower end of the drill core barrel 1 is open, the drill core barrel 1 is of a hollow cylinder, a plurality of drill bits 12 are uniformly arranged on the annular surface at the opening of the lower end of the drill core barrel 1, the drill bits 12 are obliquely arranged towards the hollow holes of the drill core barrel 1, the drill bits 12 extend into the holes of the drill core barrel 1, the length of the drill bits 12 extending into the inner holes of the drill core barrel 1 is d, and d is not more than 2cm; the length of the core pulling clamping block 111 extending into the inner wall of the core pulling groove 11 is s, and the length d is smaller than s;
the drill bit 12 can be ensured to have a certain gap between the core sample which is drilled in and the inner wall of the drill core barrel 1 as long as the drill bit extends out of the inner hole of the drill core barrel 1, so that the core sample is prevented from being influenced by the drill core barrel 1 during drawing, and the drill bit 12 also needs some drill bits to extend out of the outer wall of the drill core barrel 1, so that the outer wall of the drill core barrel 1 is separated from a concrete layer, and the drill core barrel 1 is conveniently pulled out after the test is finished; the drill bit 12 also has a plurality of directions different, and also has a plurality of drill bits 12 to the outside slope of core barrel 1 section of thick bamboo wall, be convenient for through the concrete core of a plurality of different directions and the concrete wall or the ground of original injection pouring totally separate, form the fault to can not have the unnecessary core sample that connects that is used for the concrete test of interference to draw and test the drawing force, the data is more accurate.
The drill core barrel 1 is of a hollow cylindrical structure with an opening at the lower end, the inner diameter of the drill core barrel 1 can be 60-200 mm, the drill hole drawing depth is set, a plurality of core drawing grooves 11 are uniformly formed in the same height position on the hollow inner wall of the cylinder of the drill core barrel 1, the upper end of the drill core barrel 1 is closed, a connecting block 13 is fixedly arranged outside the upper end of the drill core barrel 1, a screw hole is formed in the center of the upper end of the connecting block 13, the connecting block 13 is locked with a driving rod 41, and the drill motor 4 is convenient for driving the drill core barrel 1 to drill holes;
the number of the core pulling grooves 11 is between 4 and 12, the optimal number of the core pulling grooves 11 is 6 or 8 based on the size of the core pulling grooves 11 and the diameter of the core drilling barrel 1, and the symmetrical arrangement ensures that the stress of the cut concrete cores is more uniform;
each core pulling groove 11 is internally provided with a rotating pin 115, the core pulling grooves 11 are provided with rotating pins 115, the rotating pins 115 are mutually perpendicular to the axis of the core barrel 1 in the same vertical plane, and the core pulling clamping blocks 111 can be transversely overturned towards the inside of the core barrel 1 through the rotating pins 115 and are arranged in the core pulling grooves 11
Each core pulling groove 11 is rotatably provided with a core pulling clamping block 111 through a rotating pin 115, the core pulling grooves 11 are internally provided with a positioning block 113, the upper end of the positioning block 113 is connected with an adjusting rod 114, the upper end of the adjusting rod 114 extends out of the top of the core barrel 1, the adjusting rod 114 can be vertically arranged in the barrel wall of the core barrel 1, the adjusting rod 114 is locked with the core barrel 1 through an adjusting nut 112, the adjusting rod 114 is a polished rod, one end of the adjusting rod 114 extending out of the top of the core barrel 1 is provided with threads, the threads at the upper end of the adjusting rod 114 are locked and adjusted with the adjusting nut 112, the adjusting rod 114 is pulled upwards through the rotating pulling of the adjusting nut 112, the upper ends of the positioning block 113 and the core pulling clamping blocks 111 are mutually propped against each other to be clamped, the adjusting rod 114 can be pushed downwards through the rotating and the adjusting nut 112 is released, and the core pulling clamping blocks 111 and the positioning block 113 are mutually released;
the positioning block 113 is clamped between the bottom of the core pulling groove 11 and the inner side surface of the core pulling clamping block 111, and the upper end of the core pulling clamping block 111 and the positioning block 113 can mutually extrude and retract to extend out of the hollow hole of the core barrel 1; the adjusting nut 112 is arranged at the top of the upper end of the drill core barrel 1, the adjusting rod 114 is a screw rod, and the adjusting rod 114 rotates and rises in the barrel wall of the drill core barrel 1 through threads;
in another installation mode of the adjusting rod 114, the adjusting rod 114 can be an entire screw rod, the adjusting rod 114 is installed in the drill core barrel 1 through threads, an adjusting nut 112 is fixedly welded outside the adjusting rod 114, the adjusting rod 114 is lifted in the drill core barrel 1 through rotating the adjusting nut 112 to rotate the adjusting rod 114, and the positioning block 113 is driven to lift; the adjusting rod 114 is made of a material with high rigidity, small deformation and insensitive temperature, and the steel bar has better rigidity and can not or seldom generate adverse actions such as deformation, bending and the like which influence the operation effect when pushing or pulling back the positioning ball.
The positioning block 113 is a sphere, the core pulling clamping block 111 is a wedge block, the tip end of the core pulling clamping block 111 is arranged towards the upper end of the drill core barrel 1, the inner side surface of the core pulling clamping block 111 is a cambered surface with a large upper part and a small lower part, the sum of the diameter of the positioning block 113 and the thickness of the upper end of the core pulling clamping block 111 is larger than the depth c of the core pulling groove 11, the sum of the diameter of the positioning block 113 and the thickness of the lower end of the core pulling clamping block 111 is smaller than the depth c of the core pulling groove 11, and the length d is smaller than s, so that the length s of the core pulling clamping block 111, which stretches out to clamp a concrete core, is larger than the gap d drilled by the drill bit 12, and the core pulling clamping block 111 can clamp the concrete core sample for drawing;
the closed end of the core barrel 1 is also provided with a water inlet hole 14, and the water inlet hole 14 is communicated between the outer part of the upper end of the core barrel 1 and the hollow inner hole, so that water can be conveniently injected into the core barrel 1 to cool the drill bit 12.
When the device is used, the vertical concrete wall can be detected, the horizontal ground can be detected, the anchor seat 33 is only required to be locked on the concrete surface to be tested through an expansion screw during operation, then the lifting frame 34 is ensured to be at the same height position of the fixed hack lever 3, then the control switch 32 is controlled to drive the telescopic rod 31, the drill bit 12 is attached to the concrete surface, then the drilling motor 4 is started, the drilling motor 4 drives the drilling core barrel 1, the most concrete surface of the drilling core barrel 1 is drilled, the inner hole of the drilling core barrel 1 is a drilled concrete core sample, then the control switch 32 is continuously operated to control the telescopic rod 31, the lifting frame 34 is lowered towards the concrete surface, the distance between the selected core pulling clamping block 111 and the top of the drilling core barrel 1 is determined according to the design thickness of sprayed concrete, for example, the design thickness of sprayed concrete is 30cm, and the distance between the selected core pulling clamping block 111 and the top of the inner cavity of the drilling core barrel 1 is 20cm; if the design thickness of the sprayed concrete layer is 50cm, the distance between the core pulling clamping block 111 and the top 40cm of the core barrel 1 is selected, the drilling depth is required to be larger than the thickness of the concrete layer, namely, the drawing depth is smaller than the set thickness of the sprayed concrete layer by 10cm, the drilling depth is required to be ensured, the thickness of the sprayed concrete layer is preset and fixed before pouring, and the depths of the core pulling clamping block 111 and the end face of the drill bit 12 of the core barrel 1 are also fixed, and only the drilling depth is required to be ensured.
Then all adjusting nuts 112 are rotated, the connecting block 13 is lifted, the connecting block 13 and the upper end of the core pulling clamping block 111 are pressed and abutted by a camera, the wedge-shaped tip of the core pulling clamping block 111 is ejected, the wedge-shaped tip of the core pulling clamping block 111 is abutted against the side wall of a concrete core sample drilled by the core drilling barrel 1, then the dynamometer 22 is started, the dynamometer 22 is an anchor rod puller, a hydraulic jacking device is arranged in the dynamometer 22, the core drilling barrel 1 and the drilling motor 4 are pulled by the dynamometer 22, the drilled concrete core sample is pulled by continuously applying force, and when the tensile force is not increased any more, the dynamometer 22 is closed; the maximum force value is recorded, the adjusting rod 114 is rotated, the positioning block 113 and the core pulling clamping block 111 are mutually loosened and do not abut against each other, and at the moment, the core pulling clamping block 111 is retracted into the core pulling groove 11, so that the device can be disassembled, and the test is completed.
Because the device is designed for the bond strength test of sprayed concrete, the strength of the used fixing hack lever 3 and the anchor rod drawing instrument are based on the bond strength of the concrete and the rock stratum, so that the device is only suitable for the bond strength test of the concrete and the rock stratum, the device is also developed for the technical problems encountered in the concrete test, and the mode including the drawing test is also a conventional test mode for the bond strength test of the concrete in the field.
In addition, in the description of the present invention, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. are presented, the indicated orientation or positional relationship is based on that shown in the drawings, only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (9)
1. A concrete bond strength testing device, comprising: the drilling device comprises a drilling core barrel (1), a supporting seat (2), a fixing rack rod (3), a control switch (32), an anchoring seat (33) and a drilling motor (4);
the drilling machine comprises a drilling core barrel (1), wherein the lower end of the drilling core barrel (1) is provided with an opening, a hollow cylindrical structure is arranged in the drilling core barrel, a plurality of core pulling grooves (11) are uniformly formed in the same height position of the inner circular arc wall of the drilling core barrel (1), a plurality of drill bits (12) are uniformly arranged on the circular ring surface at the opening of the lower end of the drilling core barrel (1), the upper end of the drilling core barrel (1) is closed, and a connecting block (13) is fixedly arranged outside the upper end of the drilling core barrel (1);
a core pulling clamping block (111) is rotatably arranged in each core pulling groove (11), a positioning block (113) is further arranged in each core pulling groove (11), the upper end of each positioning block (113) is connected with an adjusting rod (114), the upper end of each adjusting rod (114) extends out of the top of the core drilling barrel (1), the adjusting rods (114) can be vertically arranged in the barrel wall of the core drilling barrel (1), and the adjusting rods (114) are locked with the core drilling barrel (1) through adjusting nuts (112);
the positioning block (113) is clamped between the bottom of the core pulling groove (11) and the inner side surface of the core pulling clamping block (111), and the upper end of the core pulling clamping block (111) and the positioning block (113) can mutually extrude and retract to extend out of a hollow hole of the core barrel (1);
the support seat (2) is a stable frame, a dynamometer (22) is stably erected in the support seat (2), a drilling motor (4) is detachably locked below the dynamometer (22), and the drilling motor (4) is locked and installed on the connecting block (13);
the device comprises an anchor seat (33), two control switches (32), a lifting frame (34) and a supporting seat (2), wherein the anchor seat (33) is a base which is stably erected, the anchor seat (33) can be detachably locked on a concrete surface to be detected, two anchor seats (33) are arranged, a fixing frame rod (3) is vertically erected at the top of each anchor seat (33), a telescopic rod (31) is vertically telescopic at the top of each fixing frame rod (3), the lifting frame (34) is horizontally erected between the two telescopic rods (31) on the two anchor seats (33), and the control switches (32) are controllers of the two telescopic rods (31), and the supporting seat (2) is fixedly arranged on the lifting frame (34);
the axis of the core barrel (1), the driving shaft of the drilling motor (4) and the drawing direction of the dynamometer (22) are overlapped, and the fixing rack rod (3) and the axis of the core barrel (1) are parallel on the same vertical plane.
2. The concrete bonding strength testing device according to claim 1, wherein: the adjusting nut (112) is arranged outside the top end of the drill core barrel (1), the upper end of the adjusting rod (114) is locked with the adjusting nut (112) through threads, and the adjusting rod (114) is locked and lifted in the wall of the drill core barrel (1) through rotation of the adjusting nut (112);
the positioning block (113) is a sphere, the core pulling clamping block (111) is a wedge block, the tip end of the core pulling clamping block (111) is arranged towards the upper end of the drill core barrel (1), the inner side surface of the core pulling clamping block (111) is a cambered surface with a large upper part and a small lower part, the sum of the diameter of the positioning block (113) and the thickness of the upper end of the core pulling clamping block (111) is larger than the depth c of the core pulling groove (11), and the sum of the diameter of the positioning block (113) and the thickness of the lower end of the core pulling clamping block (111) is smaller than the depth c of the core pulling groove (11);
the core pulling groove (11) is provided with a rotating pin (115), the rotating pin (115) and the axis of the core drilling barrel (1) are mutually perpendicular in the same vertical plane, and the core pulling clamping block (111) can be transversely overturned towards the inside of the core drilling barrel (1) through the rotating pin (115) and is arranged in the core pulling groove (11).
3. The concrete bonding strength testing device according to claim 1, wherein: the drill bit (12) is obliquely arranged towards the inside of the hollow hole of the drill core barrel (1), the drill bit (12) stretches into the hole of the drill core barrel (1), the length of the drill bit (12) stretching into the inner hole of the drill core barrel (1) is d, and d is not more than 2cm;
the length of the core pulling clamping block (111) extending into the inner wall of the core pulling groove (11) is s, and the length d is smaller than s.
4. The concrete bonding strength testing device according to claim 1, wherein: the closed end of the core barrel (1) is provided with a water inlet hole (14), and the water inlet hole (14) is communicated between the outer part of the upper end of the core barrel (1) and the hollow inner hole.
5. The concrete bonding strength testing device according to claim 1, wherein: the outer end of the connecting block (13) is provided with a threaded hole, a driving rod (41) is arranged on a driving shaft of the drilling motor (4), and the connecting block (13) is in threaded locking connection with the driving rod (41).
6. The concrete bonding strength testing device according to claim 1, wherein: the dynamometer (22) is an anchor rod drawing instrument, a drawing end of the dynamometer (22) is connected with a drawing piece (21), the drawing piece (21) is tightly locked with the drilling motor (4), and a pulling force direction of the dynamometer (22), the drawing piece (21) and a driving shaft of the drilling motor (4) are on the same straight line.
7. The concrete bonding strength testing device according to claim 1, wherein: the fixed hack lever (3) and telescopic link (31) constitute complete telescopic link, the both sides of crane (34) are locked at the top of both sides telescopic link (31), two telescopic link (31) are parallel to each other, two telescopic link (31) are vertical flexible in step.
8. A concrete bonding strength testing method is characterized in that: the method for testing the bonding strength of concrete needs to provide a device for testing the bonding strength of concrete according to claims 1-7, which comprises the following steps:
step 1, selecting a flat concrete surface to be subjected to strength test, and delineating a defect-free part of the concrete surface;
step 2, attaching the bottoms of the two anchor seats (33) to a concrete surface, enabling the fixing frame rod (3) to be perpendicular to the concrete surface, moving the position of the anchor seats (33), enabling the opening end of the core barrel (1) to be opposite to a selected concrete test position, determining the fixing position of the anchor seats (33), and locking the anchor seats (33) on the concrete surface by using expansion screws;
step 3, adjusting the position of the adjusting rod (114) to enable the positioning block (113) to be abutted against the lower end of the core pulling clamping block (111), enabling the core pulling clamping block (111) and the positioning block (113) not to be mutually extruded, and enabling the core pulling clamping block (111) to retract into the core pulling groove (11);
step 4, starting a drilling motor (4), wherein the drilling motor (4) drives a core drilling barrel (1) to start rotating drilling, simultaneously injecting water into a water inlet hole (14) to ensure that water flows out of the opening end of the core drilling barrel (1), starting a control switch (32) to control a telescopic rod (31) to translate along a fixed hack lever (3) towards a concrete surface to approach, and starting the core drilling of a concrete surface to be tested by a drill bit (12) at the opening end of the core drilling barrel (1);
step 5, after the core barrel (1) drills to a preset depth, the drilling motor (4) is turned off, the core barrel (1) stops drilling, water is injected into the water inlet hole (14), and at the moment, concrete is annularly cut into a cylindrical core sample by the opening end face of the core barrel (1);
step 6, an adjusting nut (112) outside the top end of the core barrel (1) is rotated, an adjusting rod (114) is pulled by the adjusting nut (112) to translate towards the upper end, a positioning block (113) follows the adjusting rod (114) to translate towards the upper end until the positioning block (113) and the upper end of a core pulling clamping block (111) are mutually abutted, the positioning block (113) ejects the tip end part of the core pulling clamping block (111) above into a hollow hole inside the core barrel (1), the tip end of the core pulling clamping block (111) stretches out of the side wall of the core sample, all the core pulling clamping blocks (111) are sequentially and symmetrically adjusted, and the core sample is clamped through a plurality of core pulling clamping blocks (111);
step 7, starting a force measuring instrument (22), wherein the force measuring instrument (22) starts to apply drawing force to a pull-out piece (21), the pull-out piece (21) transmits the drawing force to a core barrel (1) through a drilling motor (4), the core barrel (1) pulls out a concrete core sample through a plurality of core pulling clamping blocks (111), and when the force measuring instrument (22) detects that the pulling force is not increased any more, the maximum force value is recorded, and then the force measuring instrument (22) is closed;
step 8, then the knob adjusting nut (112) is used for loosening the core pulling clamping block (111) through the adjusting rod (114), so that the core drilling barrel (1) is loosened and separated from the concrete core sample, then the anchoring seat (33) is disassembled, the anchoring seat (33) is separated from the concrete testing surface, and the bonding strength test of the concrete and the rock stratum at a selected position is completed;
step 9, every 1000m 2 The sprayed concrete surface is at least tested for 6 adhesive strength, and sampling positions are randomly and uniformly distributed.
9. The method for testing the bonding strength of concrete according to claim 8, wherein the method comprises the following steps: the depth h of the core pulling clamping block (111) clamped with the concrete core sample is smaller than the total thickness of the sprayed concrete layer by 10cm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022113564420 | 2022-11-01 | ||
| CN202211356442.0A CN115791597A (en) | 2022-11-01 | 2022-11-01 | Concrete bonding strength testing device and testing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116929924A true CN116929924A (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211356442.0A Withdrawn CN115791597A (en) | 2022-11-01 | 2022-11-01 | Concrete bonding strength testing device and testing method thereof |
| CN202310809688.7A Pending CN116929924A (en) | 2022-11-01 | 2023-07-04 | Concrete bonding strength testing device and testing method thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211356442.0A Withdrawn CN115791597A (en) | 2022-11-01 | 2022-11-01 | Concrete bonding strength testing device and testing method thereof |
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| CN (2) | CN115791597A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116539357B (en) * | 2023-06-27 | 2024-01-05 | 湖南省建筑科学研究院有限责任公司 | Full-automatic core drilling and direct pulling integrated machine and detection method thereof |
-
2022
- 2022-11-01 CN CN202211356442.0A patent/CN115791597A/en not_active Withdrawn
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2023
- 2023-07-04 CN CN202310809688.7A patent/CN116929924A/en active Pending
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| CN115791597A (en) | 2023-03-14 |
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