CN212008418U - Drawable dynamic testing device for compactness of grouting body in steel bar sleeve - Google Patents
Drawable dynamic testing device for compactness of grouting body in steel bar sleeve Download PDFInfo
- Publication number
- CN212008418U CN212008418U CN202020272294.4U CN202020272294U CN212008418U CN 212008418 U CN212008418 U CN 212008418U CN 202020272294 U CN202020272294 U CN 202020272294U CN 212008418 U CN212008418 U CN 212008418U
- Authority
- CN
- China
- Prior art keywords
- transmission rod
- force transmission
- rigid
- steel bar
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 73
- 238000003825 pressing Methods 0.000 claims description 35
- 239000011440 grout Substances 0.000 claims description 26
- 230000001133 acceleration Effects 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 description 29
- 239000000306 component Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 16
- 238000001914 filtration Methods 0.000 description 14
- 239000002002 slurry Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000008358 core component Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/40—Detecting the response signal, e.g. electronic circuits specially adapted therefor by amplitude filtering, e.g. by applying a threshold or by gain control
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4427—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with stored values, e.g. threshold values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
Abstract
The utility model relates to a drawable dynamic testing device for the compactness of a grouting body in a steel bar sleeve, which comprises a prepressing component, a force transmission rod, a telescopic adjusting part, a vibration sensor and a data acquisition system; the force transmission rod is a rigid rod body and is arranged on the rigid prepressing component through a telescopic adjusting piece; the rigid prepressing component is used for fixing the force transfer rod on a wall body where the steel bar sleeve connecting structure is located, and the telescopic adjusting part is fixed on the rigid prepressing component and used for controlling the force transfer rod to move along the direction vertical to the wall body so that the end part of the force transfer rod is tightly supported on the surface of a steel bar in the steel bar sleeve to be detected; the vibration sensor is fixed on the force transmission rod, and the data acquisition system is used for acquiring sensing signals of the vibration sensor; and quantitatively analyzing the grouting compactness of the steel bar sleeve connection.
Description
Technical Field
The utility model belongs to the measurement field, concretely relates to can extract from compact degree dynamic test device of grout body in steel sleeve of formula among the building engineering.
Background
As a new green environment-friendly energy-saving building mode, the assembly type building structure has a plurality of advantages, gets wide attention of relevant people at home and abroad, and represents the direction of technical progress of the building industry. The quality control of the on-site connection of the prefabricated parts is vital to guarantee the safe and normal use of the fabricated building, but an effective detection means is still lacked in the current engineering, so that the research and development of a detection and evaluation method for the on-site connection quality of the fabricated structure are urgently needed to realize the quality control and quality detection in the construction process and after the construction is finished.
The on-site splicing of the prefabricated parts is usually performed by adopting the connection of steel bar sleeve joints, and once the connection structures have problems, great safety accidents occur, and the consequences are not imagined. For the connection of the nodes of the steel bar sleeves, the connection quality depends on whether grouting in the sleeves is full and compact. Therefore, a reasonable and reliable quantitative detection method for grouting compactness of the steel sleeve is needed to detect the connection quality of the key nodes of the fabricated building, so that safety accidents are avoided.
At present, the grouting compactness of the steel bar sleeve connection is tested, and from the prior literatures and patents, the resistance test method, the steel wire drawing method, the vibration sensor method with damping, the impact echo method and the ultrasonic wave method are mainly used. In the cited resistance test method, the steel wire drawing method and the vibration sensor method with damping, pre-embedding is needed, random detection cannot be carried out, and the pre-embedded component is damaged after pre-embedding, so that the test cannot be carried out. Secondly, because the test needs to be pre-buried, because of the requirement of cost, a large amount of tests can not be carried out, so the reliability needs to be examined.
In the testing of grouting compactness of the steel bar sleeve connection, a dynamic testing mode is the most potential, and the Impact Echo-Test (IET) accounts for most of the dynamic testing mode, and the ultrasonic method is used for the next testing mode. For the IET, the distance between the impact surface and the reflection surface is too short for the sleeve embedded in the structural member, so that the incident and reflected P waves are superimposed, and the final result is that the position and the degree of the defect cannot be directly identified, or the time domain wave band showing the defect is directly submerged.
In the ultrasonic method, continuous vibration with fixed frequency is applied to the wall surface outside the sleeve, and then the ultrasonic sensor receives the continuous vibration, and the analysis is performed based on incident waves and reflected waves (or transmitted waves).
Therefore, at present, no effective scheme capable of being implemented in engineering practice exists for detecting the compactness of the sleeve grouting body. It is against this background that a new method is proposed, in which a certain pre-stress is applied to the reinforcement by means of a force-transmitting rod on a special device, and then an impact force (possibly by hammering) is applied to the end of the force-transmitting rod. Because the force transmission rod applies certain pre-pressure, the vibration of the steel bar can be transmitted to the force transmission rod after the steel bar is impacted to generate vibration, and the vibration information from the horizontal vibration of the steel bar can be collected by means of the strain gauge arranged on the force transmission rod. The analysis of time domain signals and frequency domain signals is carried out on the collected vibration signals, and the grouting compactness of the steel bar sleeve connection can be obtained through analysis.
Disclosure of Invention
An object of the utility model is to solve the problem that exists among the prior art to a can extract from the interior closely knit degree dynamic testing arrangement of grout body of steel sleeve of formula is provided.
The utility model discloses the concrete technical scheme who adopts as follows:
a device for dynamically testing the compactness of a grouting body in a withdrawable reinforcing steel bar sleeve comprises a rigid prepressing component, a force transmission rod, a telescopic adjusting part, a vibration sensor and a data acquisition system; the force transmission rod is a rigid rod body and is arranged on the rigid prepressing component through a telescopic adjusting piece; the rigid prepressing component is used for fixing the force transmission rod on a wall body where the steel bar sleeve connecting structure is located; the telescopic adjusting piece comprises a pre-pressure applying plate and a locking piece; the force transmission rod is rigidly connected and fixed with the pre-pressure applying plate, the pre-pressure applying plate and the rigid pre-pressing member form locking with adjustable relative distance through at least one locking piece, and the distance adjusting direction is consistent with the axial direction of the force transmission rod; the telescopic adjusting piece is used for controlling the force transmission rod to move along the direction vertical to the wall body, so that the end part of the force transmission rod is tightly supported on the surface of a steel bar in the steel bar sleeve to be detected; the vibration sensor is fixed on the force transmission rod, and the data acquisition system is used for acquiring sensing signals of the vibration sensor.
Preferably, the rigid pre-pressing member is a cover-shaped hollow steel member, and the periphery of the bottom of the rigid pre-pressing member is fixed on a wall where the steel bar sleeve connecting structure to be detected is located.
Furthermore, a through hole is formed in the pre-pressure applying plate, a limit nut is fixed at the position of the through hole, a thread is externally tapped at the middle position of the rod body of the force transmission rod, the force transmission rod penetrates through the through hole in the pre-pressure applying plate and then is screwed into the limit nut, and the thread on the rod body and the limit nut form thread fit for driving the force transmission rod to axially move.
Preferably, the dynamic testing device further comprises a force measuring hammer or an automatic impactor, and the force measuring hammer or the automatic impactor is used for knocking the end part of the force transmission rod to generate impact force.
Preferably, in the reinforcing steel bar sleeve connecting structure, the grout overflow hole and the grouting hole in the outer wall of the sleeve are exposed out of the surface of the wall body; the end part of the force transmission rod penetrates through the grout overflow hole or the grout injection hole and then enters the sleeve, and the force transmission rod is supported on the surface of the steel bar.
Preferably, the vibration sensor is one or more of a strain gauge, a displacement sensor, an acceleration sensor and a speed sensor.
Preferably, the vibration sensor is a strain gauge, and the strain gauge is attached and fixed to the flat surface of the force transmission rod.
Preferably, the sensor fixing frame comprises a sensor tray and a nut which are in rigid connection, the sensor fixing frame is sleeved on the outer tapping thread section of the force transmission rod through the nut, and the sensor tray is used for mounting a displacement sensor, an acceleration sensor or a speed sensor.
Preferably, the locking piece is a lock catch consisting of a pair of bolts and nuts, the pre-pressure applying plate and the rigid pre-pressing member are both provided with screw holes matched with the bolts, the bolts are sequentially screwed into the pre-pressure applying plate and the screw holes of the rigid pre-pressing member to form threaded fit, and the nuts are screwed on the end parts of the bolts.
Furthermore, the locking pieces are two and are symmetrically arranged at two ends of the pre-pressure applying plate and the rigid pre-pressure member.
Compared with the prior art (for example, CN209460091U), the utility model has the following beneficial effects:
a) the cover-shaped hollow steel component of the original rigid prepressing component is integrated, and is converted into two parts of cover-shaped hollow steel and a prepressing applying plate of the rigid prepressing component, wherein the prepressing applying plate is responsible for fixing a force transmission rod, and the rigid prepressing component is responsible for being fixed on a wall body where a steel bar sleeve connecting structure to be detected is located, so that a plurality of rigid prepressing components can be manufactured and are installed on a plurality of measuring points in advance; after the detection of a certain measuring point is finished, the lock catch is unlocked to form the assembly of the removable part, the assembly of the removable part can be directly installed on the measuring point to be detected of the fixed rigid prepressing component, and the pre-pressure is applied through the lock catch, so that the bottom of the force transmission rod is tightly supported on a grouting entity of the steel bar sleeve connecting structure to be detected, and the detection efficiency is improved;
b) in the prior art, a pre-pressure is applied to a force transmission rod to prop against the surface of a steel bar in a steel bar sleeve through an adjusting piece in the middle of a rigid pre-pressing component, and because the pre-pressure needs to be controlled, a torque needs to be applied to the adjusting piece, the rigid pre-pressing component is easily fixed on a wall outside a to-be-measured object, and the rigid pre-pressing component is easily separated and needs to be fixed again because of poor fixation; the device in the prior art cannot pull out the core component and re-install and fix the core component at the next point to be tested, so that the testing efficiency is greatly reduced. In the utility model, the torque which can be adjusted by the locking pieces such as the lock catch is divided into two parts, so that the torque required to tighten the lock catch is reduced by half; in addition, the lock catch can be arranged at the edge of the whole device, so that the whole device can provide higher shearing resistance when torque is applied to the lock catch for screwing;
c) in the utility model, the rigid prepressing component and the prepressing applying plate are both provided with slotted holes; the force transmission rod is supported on the steel bar of the steel bar sleeve connecting structure to be detected, but the force transmission rod cannot touch the wall, otherwise, the detection precision is influenced; the slotted hole has the advantages that even if the deviation of the rigid pre-pressing member is large during installation, the position can be adjusted through the lock catch part, so that the problem that the rigid pre-pressing member needs to be disassembled again because the rigid pre-pressing member cannot be installed at any position is avoided, and the side edge of the force transmission rod can be prevented from colliding with the wall when the rigid pre-pressing member is installed again;
d) the utility model can utilize the lock catch to adjust the auxiliary distance, which is more favorable for accurately and conveniently controlling the pre-pressure applied by the force transmission rod;
e) in the prior art, a vibration sensor is actually a patch type sensor and is attached to a full-optical circular surface, and the diameter of a force transmission rod is very small (5-10 mm), so that the patch type sensor is easy to bend, and is finally either damaged or the measurement accuracy does not meet the requirement; in the utility model, the vibration sensor (here, strain gauge) can be attached to the flat surface of the force transmission rod, and the measurement precision can be increased;
f) compared with the force transmission rod in the prior art, the force transmission rod of the novel device can be provided with the hexagonal handle at the end part, and the position can use a socket wrench to apply torque to the force transmission rod so as to conveniently meet the adjustment requirement in detection;
g) for only one vibration sensor among the prior art the utility model discloses in, can further set up multiple vibration sensor such as acceleration sensor through the sensor mount, can integral acceleration value to speed or displacement to improve the accuracy that detects.
Drawings
Fig. 1 is a schematic view of a grouting body compactness detection device in an improved steel bar sleeve connection structure;
FIG. 2 is a schematic view of a rigid pre-compression member;
FIG. 3 is a schematic view of a pre-stress applying plate;
FIG. 4 is a schematic structural diagram of a strain gage;
FIG. 5 is a schematic structural view of a force transfer bar;
FIG. 6 is a schematic view of the latch;
FIG. 7 is a schematic structural view of a sensor holder;
FIG. 8 is an assembled view of the removable portion;
FIG. 9 is a schematic view of the structure after the removable portion is installed in the rigid pre-compression member;
FIG. 10 is a schematic structural view of the removable portion and the rigid pre-compression member after being locked by the latch;
fig. 11 is a schematic diagram of a detection state of a grouting body compactness detection device in an improved steel bar sleeve connection structure;
FIG. 12: the steel bar sleeve is in three connecting structure forms;
in the figure: the device comprises a slotted hole 1, a small hole 2, a force transmission rod through hole 3, a pre-pressure applying plate 4, a central hole 5, a rigid pre-pressing component 6, a sensor tray 7, a nut 8, an acceleration sensor 9, a sensor fixing frame 10, a strain gauge 11, an external tapping section 12, a hexagonal handle 13, a variable cross-section transition section 14, a thin rod section 15, a force transmission rod 16, a lock catch 17, a wing foot 18, a threaded hole 19, a steel bar 20, a slurry discharge joint 21, a slurry injection joint 22, concrete 23, a cover 24, a slurry injection body 25, a drill hole 26, a detection device 27, a small signal/low noise amplifier 28, a signal acquisition instrument 30, an upper computer 31, a matched data line 32 and an impact force 33.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and embodiments. The utility model provides a can extract closely knit degree dynamic test device of grout body in the steel sleeve of formula of leaving, the object to is steel sleeve connection structure. In a conventional steel bar sleeve connection structure, two steel bars 20 are connected through a connection sleeve, and concrete grouting is performed inside the sleeve for reinforcement. Because after the muffjoint structure slip casting, there is the closely knit not enough problem of slip casting probably in the sleeve to make tensile bearing capacity than the design value on the low side, influence muffjoint structure's safe normal use, consequently need provide a detection device and carry out quantitative determination to the closely knit degree of the body of pouring 25 in the steel bar muffjoint structure, eliminate engineering construction hidden danger. The form of the insufficient compactness of the grout body 25 is as follows: the grouting amount is insufficient or slurry leakage causes part of the reinforcing steel bars 20 to be exposed, or cavities appear in the grouting process to cause the grouting bodies 25 outside the reinforcing steel bars 20 to be hollow after solidification.
Although the device for testing grouting compactness of a sleeve connecting structure in a hammering prepressing mode and the detection device in the method (CN201811592823.2) can also be realized, in practical engineering, batch detection of compactness of grouting 25 in a plurality of steel bar sleeve connecting structures is usually required, and a rigid prepressing member of the detection device in the patent is directly fixed on a wall, which results in that a force transmission rod 16 with a strain gauge 11 cannot be quickly detached after detection is finished. Therefore, the utility model discloses in, designed a but grout body compactness dynamic test device in the steel sleeve of formula of drawing that more is applicable to on the engineering batch detection, its structure of following detailed description.
As shown in fig. 1, the device 27 for detecting the compactness of the grouting material 25 comprises a pre-pressure applying plate 4, a sensor fixing frame 10, a rigid pre-pressure member 6, a vibration sensor, a lock catch 17 and a force transmission rod 16. The utility model provides a vibration sensor can be for one or more combinations among foil gage 11, displacement sensor, acceleration sensor 9 and the speedtransmitter, uses foil gage 11(Strain Gauge) to explain its concrete implementation mode as an example earlier below.
As shown in fig. 2, the rigid pre-pressing member 6 is a hollow steel member in a cover shape, and can be formed by pressing a steel plate, and the bottom of the rigid pre-pressing member is turned outwards through a right angle to form a fixed plane, so that the rigid pre-pressing member can be attached to the surface of a wall body to be installed. The rigid prepressing component 6 is provided with a slotted hole 1, a small hole 2, a central hole 5 and a wing foot 18, and the two ends of the slotted hole 1 are respectively provided with one; two small holes 2 are respectively arranged at two ends; the force transmission rod through hole 3 is used for allowing the force transmission rod 16 to pass through. The rigid pre-pressing member 6 is connected and fixed with the wall body through fixing pieces such as adhesive or expansion bolts. The central hole 5 in the top cover is for the passage of a sensor holder 10 fixed to a force transmission rod 16. The slotted hole 1 of the top cover is used for enabling the lock catch 17 to pass through the slotted hole 1 of the pre-pressure exerting plate 4 to exert the pre-pressure effect on the force bar 16. The small holes 2 in the top cover are used for positioning or passing through the sensor data lines. The rigid pre-pressing member 6 can be fixed to the wall surface to be measured by nails or screws through the small holes 2 of the wing legs 18, or fixed to the wall surface to be measured by glue, or both.
Of course, the rigid pre-stressing element 6 may also take other forms, such as a straight cylinder, or may be a device for applying pressure to the force transfer rod 16 from the outside, as long as it provides one or more rigid support points for the force transfer rod 16.
As shown in fig. 5, the force transmission rod 16 is preferably designed in a multi-section structure, and is sequentially divided into an external tapping section 12, a hexagonal handle 13, a variable cross-section transition section 14 and a thin rod section 15, and the whole force transmission rod 16 is integrally formed by a steel material. Wherein the outside diameter of the thin rod section 15 should be smaller than the grout hole of the sleeve so as to be inserted into the sleeve and support the surface of the steel bar 20. The transition section 14 has a flat surface to which the strain gage 11 is attached. The external thread 12 is used for mounting engagement with the pre-pressure-exerting plate 4 and also for mounting the sensor holder 10, while the hexagonal shank 13 is used for screwing the force-transmitting rod 16.
In order to guarantee the utility model discloses a detect can go on smoothly, when steel bar sleeve connection structure pours, excessive thick liquid hole and the slip casting hole on the sleeve outer wall all should work as exposing in the wall body surface. During detection, the end part of the force transmission rod 16 can penetrate through the grout overflow hole or the grout injection hole and then enter the sleeve, and is supported on the surface of the steel bar 20. However, for accuracy of measurement, it is preferred that the force transfer bar 16 preferably pass through the grout hole and into the interior of the sleeve, bearing against the surface of the rebar 20.
As shown in fig. 3, the pre-pressure applying plate 4 is a rigid plate made of steel. The prepressing applying plate 4 is provided with a slotted hole 1, a small hole 2 and a force transmission rod through hole 3 which correspond to the rigid prepressing component 6. Transmission stick through-hole 3 is for can lead to transmission stick 16, the utility model discloses in, stop nut 8 of coaxial welding on passing transmission stick through-hole 3, the outer thread of attack section 12 of transmission stick 16 constitutes screw-thread fit with stop nut 8, through rotatory hexagonal handle 13, can adjust transmission stick 16 along self axial around flexible. Of course, the limiting nuts 8 may not be directly welded, but two limiting nuts 8 are respectively attached to the two side surfaces of the pre-pressure applying plate 4, so that the force transmission rod 16 passes through the two limiting nuts 8 to be fixed. In addition, the slots 1 in the pre-pressure application plate 4 and the slots 1 in the rigid pre-pressure member 6 need to be maintained in a one-to-one correspondence for mounting the locking catches 17. The small holes 2 on the pre-pressure applying plate 4 correspond to the small holes 2 on the rigid pre-pressure member 6 one by one, and can be used for passing through sensor data lines or positioning.
As shown in fig. 4, the strain gauge 11 is planar and can be directly attached to the flat surface of the transition section 14.
As shown in fig. 6, the catch 17 consists of a pair of bolts and nuts 8, the bolts being able to be screwed into corresponding slots 1 in the pre-pressure-applying plate 4 and in the rigid pre-pressure member 6, or into the small holes 2 of the pre-pressure-applying plate 4, and being in threaded engagement with the two slots 1, respectively, and the nuts 8 being screwed onto the ends of the bolts. Thus, the relative distance between the pre-pressure application plate 4 and the rigid pre-pressure component 6 can be adjusted by the bolts while the pre-pressure application plate and the rigid pre-pressure component are locked, and the distance adjusting direction is consistent with the axial direction of the force transmission rod 16. In this embodiment, in order to maintain the overall stress balance, the pre-pressure applying plate 4 and the rigid pre-pressure member 6 are respectively provided with a slotted hole 1 at both ends, and the distance between both sides is adjusted by a lock catch 17. Further, since the lock catches 17 are provided at the edge positions of the entire apparatus, the entire apparatus can provide a relatively greater shear resistance when the lock catches 17 are tightened by applying a torque thereto.
Of course, the vibration sensor of the present invention may also adopt other sensors capable of sensing vibration signals besides the strain gauge 11, and these sensors may be installed in an auxiliary manner through the sensor fixing frame 10. As shown in fig. 7, the sensor holder 10 is a rigid body composed of the sensor tray 7, the nut 8, and the small hole 2. The sensor fixing frame 10 is sleeved on the external tapping thread section 12 of the force transmission rod 16 through the nut 8. Through the sensor tray 7 on the left and right sides respectively have aperture 2, can install except acceleration sensor 9 (Accelerometer), speedtransmitter, or displacement sensor, sensor mount 10 can install or dismantle the sensor that attaches above, mountable is single, or two or more sensors. The strain gauge 11, the acceleration sensor 9, the speed sensor or the displacement sensor output electric signals, and the sensors need to be calibrated before use to obtain required physical quantities.
The utility model discloses in, the original signal of telecommunication that vibration sensor gathered is comparatively faint, consequently generally need be through enlargiing the processing, generally can adopt small signal low noise amplifier 28 (small signal amplifier or low noise amplifier, specifically select as required) to enlarge. The data acquisition device generally adopts a signal detection instrument matched with the sensor. In addition, there may be more disturbance and noise, so that it is necessary to remove disturbance noise and noise by a filter. The filtering and denoising include one or more of wiener filtering, Kalman filtering, band-stop filtering and low-pass filtering. The utility model discloses an among the preferred filtering method, the wave filter comprises wiener filtering, kalman filter, band elimination filter and low pass filter, and the signal of telecommunication after the amplification is earlier through wiener filtering, carries out the level and smooth through kalman filter again, then carries out digital filtering, and its process is that to input band elimination filter earlier with the signal and restrain the frequency of power frequency interference (establish to 40Hz ~ 60Hz in this embodiment), then is 3000Hz low pass filter filtering high frequency signal through cutoff frequency. After the filtering processing of the combined filter, the effective information in the electric signal collected by the strain gauge 11 can be embodied to the greatest extent, which is convenient for extracting the characteristic index. Of course, if the electrical signal collected by the strain gauge 11 itself has substantially no noise or disturbance, the filtering process can be removed, and if the original signal value is large enough, the amplifying process can be omitted. Or if the data acquisition device or the lower computer matched with the strain gauge is provided with amplification or filtering, the output electric signal can be directly used as the vibration sensing signal without additional amplification or filtering.
The pre-pressure-exerting plate 4, the sensor holder 10, the strain gauge 11 and the force-transmitting rod 16 are joined together to form an extractable part as shown in fig. 8, in which the rigid pre-pressure member 6 and the catch 17 have not yet been mounted. The removable part can then be inserted into the rigid pre-compression element 6, as shown in fig. 9, and the slots 1 at both ends are fixed by means of the locking catches 17, as shown in fig. 10. As shown in fig. 11, the data acquisition system may include a small signal/low noise amplifier 28 and an upper computer 31, and the vibration sensor is connected to the small signal/low noise amplifier 28 and the signal acquisition instrument 30 and then is in communication connection with the upper computer 31. The acquired original signal is an analog signal, which is amplified by a small signal/low noise amplifier 28 and then needs to be sampled and converted into a digital signal by an analog-to-digital converter and stored in a data acquisition device. Taking the acceleration sensor 9 mounted on the sensor fixing frame 10 as an example, the strain gauge 11 on the force bar 16 and the acceleration sensor 9 are correspondingly connected with the small signal/low noise amplifier 28 by using the corresponding matched data line 32, then the small signal/low noise amplifier is connected with the signal acquisition instrument 30, and finally the upper computer 31 is also connected to form a signal detection path. The signal acquisition instrument 30 of the vibration sensor is in communication connection with the upper computer 31 in a wired or wireless mode, and vibration sensing data are stored in the upper computer 31. The upper computer 31 is generally a computer. On the wall surface where the steel bar sleeve connecting structure to be detected is located, the wing feet 18 on the rigid prepressing component 6 are firmly fixed on the wall surface through AB glue or expansion bolts. The extractable part is then inserted through the central hole 5 of the rigid pre-stress element 6 and then locked by means of the catch 17, forming the complete detection device 27. During the in-service use, the accessible is rotated and is passed power stick 16 and realize its tip position and for the business turn over degree of depth adjustment of wall, is adapted to different wall body surface height, also cooperates the interval adjustment of hasp 17 simultaneously for 16 bottoms of power stick closely prop up in the reinforcing bar 20 surfaces in the reinforcing bar sleeve connection structure that awaits measuring.
Of course, the data acquisition system is not the key of the present invention, and the specific configuration should be based on the actually adopted vibration sensor, and the model and wiring mode recommended by the manufacturer can be selected.
It should be noted that the present embodiment can be applied to various forms of the steel bar sleeve connection structure of the detection device 27. As shown in fig. 12, the form is a half grouting connection steel bar sleeve (a) which comprises a threaded hole 19, a steel bar 20, a grout outlet joint 21 and a grouting joint 22; the second form is a preformed hole slurry anchor lap joint structure (b) of the grouting structure device, which comprises a reinforcing steel bar 20, a slurry discharge joint 21, a grouting joint 22 and concrete 23; the third form is full grouting connection steel bar sleeve (c), steel bar 20, slurry discharge joint 21, grouting joint 22 and cover 24. Here, the grout discharge joint 21 and the grout joint 22 are referred to as a grout discharge hole and a grout injection hole in fig. 11, and they have the same meaning. If the grout outlet joint 21 on the outer wall of the sleeve is not exposed on the surface of the wall body; and drilling a joint electric drill hole 26 from the surface of the wall to the outer wall of the sleeve, wherein the drill hole 26 penetrates through the grout outlet joint 21, and the end part of the power transmission rod 16 is supported on the reinforcing steel bar 20 of the sleeve after penetrating through the drill hole 26.
In the above detecting device 27, the rigid pre-pressing members 6 may be fixed on the wall surface of the connecting steel bar sleeve to be detected in batches, after the detection of one wall surface is completed, the locking may be released through the lock catch 17, and then the rigid pre-pressing members 6 are left on the wall surface, and the rest components are pulled away from the rigid pre-pressing members 6 to perform the test of the next measuring point, so as to improve the detection efficiency.
After the detection device 27 is installed, an impact force 33 can be applied to the end of the force rod 16, so as to obtain a vibration sensing signal. Here, a hammer or an automatic impact device may be used to apply an impact force 33 to the device 27. However, it is preferable to apply the impact force 33 using an automatic impact device, so that the impact force 33 of the same impact energy can be applied a plurality of times and signals will be collected simultaneously, thereby reducing errors.
Based on detection device 27 in this embodiment, the utility model discloses can provide a grout body 25 closely knit degree dynamic test method in the steel sleeve of preferred pull formula, its step is as follows:
And 3, positioning the wall surface of the connecting steel bar sleeve to be detected to match the two small holes 2 on the wing feet 18, and then drilling the positioned marks on the concrete 23 by using a percussion drill. A bore 26 is drilled from the wall surface towards the outer wall of the sleeve, the bore 26 penetrating the grout outlet 21, and the surface of the reinforcing steel 20 in the sleeve is inspected and determined to be exposed. Next, glue is applied to the wing feet 18 of the rigid pre-pressing member 6, and then expansion screws are fixed into the wall through the small holes 2 of the wing feet 18, so that the rigid pre-pressing member 6 can be firmly fixed on the wall where the connecting steel bar sleeve to be measured is located.
And 6, repeating the step 5 for multiple times, collecting vibration induction signals of multiple groups of strain gauges 11 and acceleration sensors 9, and storing the vibration induction signals in an upper computer 31. And then the data in the upper computer 31 can obtain a required signal through the programming and data processing of the upper computer 31, and the grouting compactness of the steel bar sleeve connection can be quantitatively determined through signal representation.
It should be noted that although the strain gauge 11 is described as a vibration sensor in the foregoing, the acceleration sensor 9, the velocity sensor, and the displacement sensor may be used to achieve the same function, and may be combined as necessary.
The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.
Claims (10)
1. A device for dynamically testing the compactness of a grouting body in a withdrawable reinforcing steel bar sleeve is characterized by comprising a rigid prepressing component, a force transmission rod, a telescopic adjusting part, a vibration sensor and a data acquisition system; the force transmission rod is a rigid rod body and is arranged on the rigid prepressing component through a telescopic adjusting piece; the rigid prepressing component is used for fixing the force transmission rod on a wall body where the steel bar sleeve connecting structure is located; the telescopic adjusting piece comprises a pre-pressure applying plate and a locking piece; the force transmission rod is rigidly connected and fixed with the pre-pressure applying plate, the pre-pressure applying plate and the rigid pre-pressing member form locking with adjustable relative distance through at least one locking piece, and the distance adjusting direction is consistent with the axial direction of the force transmission rod; the telescopic adjusting piece is used for controlling the force transmission rod to move along the direction vertical to the wall body, so that the end part of the force transmission rod is tightly supported on the surface of a steel bar in the steel bar sleeve to be detected; the vibration sensor is fixed on the force transmission rod, and the data acquisition system is used for acquiring sensing signals of the vibration sensor.
2. The apparatus for dynamically testing the compactness of a grouting material in an extractable steel reinforcement sleeve according to claim 1, wherein the rigid pre-pressing member is a cover-shaped hollow steel member, and the periphery of the bottom of the rigid pre-pressing member is fixed on a wall body where the steel reinforcement sleeve connection structure to be detected is located.
3. The device for dynamically testing the compactness of a grouting body in a detachable steel bar sleeve according to claim 2, wherein the pre-pressure applying plate is provided with a through hole, a limit nut is fixed at the position of the through hole, a thread is externally tapped at the middle part of the rod body of the force transmission rod, the force transmission rod passes through the through hole on the pre-pressure applying plate and then is screwed into the limit nut, and the thread on the rod body and the limit nut form a thread fit for driving the force transmission rod to axially move.
4. The apparatus for dynamically testing the compactness of a grouting material in a removable steel sleeve according to claim 1, further comprising a force measuring hammer or an automatic impactor for knocking the end of the force transmitting rod to generate an impact force.
5. The apparatus for dynamically testing the compactness of a grouting material in a removable steel reinforcement sleeve according to claim 1, wherein in the steel reinforcement sleeve connection structure, the grout outlet and the grout injection hole on the outer wall of the sleeve are exposed out of the surface of the wall; the end part of the force transmission rod penetrates through the grout overflow hole or the grout injection hole and then enters the sleeve, and the force transmission rod is supported on the surface of the steel bar.
6. The apparatus for dynamically testing the consistency of grouting material in a removable steel sleeve according to claim 1, wherein the vibration sensor is one or more of a strain gauge, a displacement sensor, an acceleration sensor and a speed sensor.
7. The apparatus of claim 1, wherein the vibration sensor is a strain gauge attached to a flat surface of the power transmission rod.
8. The device for dynamically testing the compactness of the grouting body in the removable steel bar sleeve according to claim 1, further comprising a sensor fixing frame, wherein the sensor fixing frame comprises a sensor tray and a nut which are rigidly connected, the sensor fixing frame is sleeved on the external tapping thread section of the force transmission rod through the nut, and the sensor tray is used for mounting a displacement sensor, an acceleration sensor or a speed sensor.
9. The apparatus of claim 1, wherein the locking member is a lock comprising a pair of bolts and nuts, the pre-pressure applying plate and the rigid pre-pressing member are both provided with screw holes matching the bolts, and the bolts are sequentially screwed into the pre-pressure applying plate and the screw holes of the rigid pre-pressing member to form a threaded engagement.
10. The apparatus for dynamically testing the consistency of grout inside a removable steel reinforcement sleeve according to claim 9, wherein the locking members are two or more and are symmetrically disposed at two ends of the pre-pressure applying plate and the rigid pre-pressure member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358644 | 2019-12-25 | ||
| CN2019113586447 | 2019-12-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212008418U true CN212008418U (en) | 2020-11-24 |
Family
ID=70997650
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010151655.4A Expired - Fee Related CN111272867B (en) | 2019-12-25 | 2020-03-06 | Method for detecting compactness of grouting body in steel bar sleeve connecting structure |
| CN202020274488.8U Expired - Fee Related CN212008443U (en) | 2019-12-25 | 2020-03-06 | Hammering device for applying impact force |
| CN202020272294.4U Expired - Fee Related CN212008418U (en) | 2019-12-25 | 2020-03-06 | Drawable dynamic testing device for compactness of grouting body in steel bar sleeve |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010151655.4A Expired - Fee Related CN111272867B (en) | 2019-12-25 | 2020-03-06 | Method for detecting compactness of grouting body in steel bar sleeve connecting structure |
| CN202020274488.8U Expired - Fee Related CN212008443U (en) | 2019-12-25 | 2020-03-06 | Hammering device for applying impact force |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN111272867B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960931A (en) * | 2022-06-10 | 2022-08-30 | 华济建设工程集团有限公司 | Concrete prefabricated wallboard and assembling method thereof |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112580192B (en) * | 2020-11-25 | 2022-06-17 | 福建工程学院 | Construction method of grouting material uniaxial stress-strain constitutive model special for sleeve |
| CN112229915B (en) * | 2020-12-11 | 2021-03-09 | 四川升拓检测技术股份有限公司 | Device and method for measuring grouting compactness of prestressed duct |
| CN112798471A (en) * | 2021-01-29 | 2021-05-14 | 广州市瀚源建设工程质量检测有限公司 | Concrete penetration resistance appearance calibration auxiliary device |
| CN112985999B (en) * | 2021-02-09 | 2022-06-07 | 中铁隧道局集团有限公司 | Grouting model test device and method used under coupling effect of multi-field environment |
| CN113324856A (en) * | 2021-07-13 | 2021-08-31 | 中南大学 | Device and method for testing impact toughness of concrete material |
| CN113899819A (en) * | 2021-10-29 | 2022-01-07 | 福建工程学院 | Device, system and method for measuring grouting compactness of prestressed duct |
| CN114018800B (en) * | 2021-10-29 | 2023-06-30 | 福建工程学院 | Device and method for measuring grouting compactness of prestressed duct |
| CN114235444A (en) * | 2021-12-22 | 2022-03-25 | 临沂东控自动化工程有限公司 | A multiple characteristic detection device for vehicle track |
| CN115419123B (en) * | 2022-09-19 | 2023-08-29 | 四川正大未来建筑科技有限公司 | Reflected wave method pile foundation detection device and excitation equipment thereof |
| CN116593588A (en) * | 2023-07-13 | 2023-08-15 | 广州市市政工程试验检测有限公司 | Device and method for detecting void defect of concrete filled steel tube column |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090173142A1 (en) * | 2007-07-24 | 2009-07-09 | Ps Systems Inc. | Controlling gas pressure in porosity storage reservoirs |
| AU2007221980A1 (en) * | 2007-10-12 | 2009-04-30 | Holcim (Australia) Pty Ltd | Jacking pipe |
| CN101615794A (en) * | 2009-08-05 | 2009-12-30 | 河海大学 | Electrical Power System Dynamic method for estimating state based on no mark transformation Kalman filter |
| US8882905B1 (en) * | 2010-05-20 | 2014-11-11 | Flashfill Services, Llc | Recycled compositions for construction, and methods of utilizing and producing the same |
| CN103020472B (en) * | 2012-12-27 | 2015-12-09 | 中国科学院深圳先进技术研究院 | Based on physiological signal quality evaluation method and the system of restrained split-flow |
| CN103115967B (en) * | 2013-01-21 | 2014-05-07 | 济南大学 | Acoustic emission sensor as well as preparation method and application thereof |
| CN103245732B (en) * | 2013-04-10 | 2015-07-08 | 湘潭大学 | Pipeline grouting mass stress wave detecting signal processing method based on wavelet extraction |
| CN103499320A (en) * | 2013-10-22 | 2014-01-08 | 中铁西北科学研究院有限公司深圳南方分院 | Anchoring engineering quality detector and analysis method |
| CN103777083B (en) * | 2014-01-24 | 2016-04-27 | 武汉大学 | Based on the capacitive equipment dielectric loss on-line monitoring method of Kalman's frequency-tracking |
| US20150338380A1 (en) * | 2014-05-21 | 2015-11-26 | University Of South Carolina | Assessing Corrosion Damage in Post-Tensioned Concrete Structures Using Acoustic Emission |
| US20160047758A1 (en) * | 2014-08-18 | 2016-02-18 | Lehigh University | Novel materials useful for radiographic imaging of construction materials and methods using same |
| CN105527013B (en) * | 2016-01-04 | 2018-08-21 | 济南大学 | A kind of implanted piezoelectric acceleration sensor and its preparation method and application for concrete structure health monitoring/detection |
| CN206876633U (en) * | 2017-06-27 | 2018-01-12 | 浙江大学 | A kind of structure of the external vibration-testing method detection telescopic splice of grouting behind shaft or drift lining |
| CN107389791B (en) * | 2017-06-27 | 2023-04-07 | 浙江大学 | Structure and method for detecting post-grouting sleeve type steel bar joint by external vibration test method |
| CN107505399A (en) * | 2017-10-09 | 2017-12-22 | 华润建筑有限公司 | A kind of intelligent reinforced bar sleeve grouting defect inspection method based on vocal print feature |
| CN108574291A (en) * | 2018-04-23 | 2018-09-25 | 河海大学 | One kind being based on Ensemble Kalman Filter generator dynamic state estimator method |
| CN108918660B (en) * | 2018-05-19 | 2020-12-25 | 徐光大 | Nondestructive detection method for sleeve grouting fullness of steel bar sleeve grouting connection joint |
| CN209167217U (en) * | 2018-10-11 | 2019-07-26 | 江苏华科建设工程质量检测有限公司 | Grouting material compactness detection device in straight screw sleeve connection part |
| KR101991203B1 (en) * | 2018-10-16 | 2019-06-19 | 장용진 | extensive grout material |
| JP6608024B1 (en) * | 2018-10-29 | 2019-11-20 | 強化土エンジニヤリング株式会社 | Ground injection material and ground improvement method |
| CN109406340A (en) * | 2018-12-25 | 2019-03-01 | 浙江大学 | Hammer the device and method of prepressing type test cartridge connection structure compactness of grouting |
| CN109765303B (en) * | 2019-01-18 | 2021-06-15 | 湘潭大学 | Detection method for void degree behind lining structure |
| CN109991244A (en) * | 2019-05-09 | 2019-07-09 | 福建工程学院 | Sleeve Grouted density detection device and method based on stress wave |
| CN110768666B (en) * | 2019-10-28 | 2023-07-11 | 南京工程学院 | Kalman filter-based phase-locked loop system and method for decoupling double synchronous coordinate systems |
-
2020
- 2020-03-06 CN CN202010151655.4A patent/CN111272867B/en not_active Expired - Fee Related
- 2020-03-06 CN CN202020274488.8U patent/CN212008443U/en not_active Expired - Fee Related
- 2020-03-06 CN CN202020272294.4U patent/CN212008418U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960931A (en) * | 2022-06-10 | 2022-08-30 | 华济建设工程集团有限公司 | Concrete prefabricated wallboard and assembling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111272867B (en) | 2021-01-26 |
| CN111272867A (en) | 2020-06-12 |
| CN212008443U (en) | 2020-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212008418U (en) | Drawable dynamic testing device for compactness of grouting body in steel bar sleeve | |
| US11835490B2 (en) | Device and method for detecting grout compactness of splice sleeve | |
| CN107389791B (en) | Structure and method for detecting post-grouting sleeve type steel bar joint by external vibration test method | |
| WO2007137466A1 (en) | A random, nondestructiv and dynamic testing apparatus and method of the stressed state of a roof bolt | |
| CN107882011B (en) | miniature probe with temperature compensation function | |
| CN107478719B (en) | Structure and method for detecting post-grouting sleeve type steel bar joint by built-in vibration test method | |
| CN107503386A (en) | Anchor rod body holds the detection means and detection method of load | |
| CN108918660A (en) | The lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing | |
| CN106989997B (en) | A kind of device of indirect measurement coarse structure face dynamic rate | |
| CN102175354B (en) | Method for measuring steel strut axial force by utilizing adhered steel sheet | |
| CN203349779U (en) | Strain-type displacement sensor and elevator brake having same | |
| CN107389472A (en) | A kind of mechanical cross plate shearing instrument and its application method | |
| CN206248252U (en) | A kind of anchor pole axial direction dynamometer | |
| CN108663265A (en) | Measure combined type torsion shear apparatus, the system and method for soil body shear wave velocity | |
| CN100414283C (en) | Method for testing compressive strength of pit sand concrete in high strength grade through rebound tester without damage | |
| CN103104272B (en) | Lossless dynamic detection device of anchor stock preload and detection method thereof | |
| d'Onofrio et al. | A new torsional shear device | |
| CN108333061A (en) | A kind of system and measurement method measuring stress relaxation | |
| CN210395465U (en) | Side surface excitation structure for detecting integrity of foundation pile by double-speed method and detection device | |
| CN209460091U (en) | A kind of device hammering prepressing type test cartridge connection structure compactness of grouting | |
| CN114111541B (en) | Bridge dynamic deflection test system and method based on stress rigidization effect | |
| CN211898294U (en) | Device for eliminating influence of dowel bar weight on accuracy of spiral plate load test | |
| Likins | Field measurements and the pile driving analyzer | |
| JP2673236B2 (en) | Concrete shear strength measuring method and measuring instrument | |
| CN109029338A (en) | A kind of embedded type concrete strain gauge means and its construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201124 |