CN111044379A - Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing - Google Patents

Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing Download PDF

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Publication number
CN111044379A
CN111044379A CN201911291868.0A CN201911291868A CN111044379A CN 111044379 A CN111044379 A CN 111044379A CN 201911291868 A CN201911291868 A CN 201911291868A CN 111044379 A CN111044379 A CN 111044379A
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iron core
connecting rod
connecting piece
lvdt displacement
core connecting
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CN201911291868.0A
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Inventor
周继凯
李友军
盛慧敏
林成欢
叶能君
张伦超
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Hohai University HHU
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Hohai University HHU
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Priority to CN201911291868.0A priority Critical patent/CN111044379A/en
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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
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12—Pressure testing
    • 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
    • G01N3/06—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
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • 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
    • G01N2203/0298—Manufacturing or preparing 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • 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
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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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)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention discloses a grouting and void defect in-situ radial compression detection device for a steel bar connecting sleeve and a use method thereof, wherein the device comprises a detection part and a loading part, wherein in the detection part, an L-shaped support is fixed at the front end of a hydraulic jack, and the detection part and the loading part form a C-shaped clamp; the LVDT displacement sensor is fixed on the hydraulic jack by a clamp, an iron core connecting rod of the split type LVDT displacement sensor is connected with a piston rod of the hydraulic jack by an iron core connecting rod connecting piece, and the iron core connecting rod is also connected with an inner iron core of the LVDT displacement sensor; when the iron core connecting rod connecting piece is fixed by the rotary lock, the iron core connecting rod connecting piece and the piston rod slide relatively, and when the iron core connecting rod connecting piece is not fixed by the rotary lock, the movement of the iron core connecting rod connecting piece and the movement of the piston rod are kept consistent; the loading part comprises a data line, a leather hose, an LVDT displacement data display instrument, a pressure gauge and a manual pump. The technical scheme can quickly, simply and conveniently judge whether the grouting sleeve has the void defect on site and judge the size and the position of the void defect.

Description

Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing
Technical Field
The invention belongs to the field of assembly type buildings, and particularly relates to an in-situ radial compression detection device for a grouting and void defect of a steel bar connecting sleeve and a using method thereof.
Background
Compared with a cast-in-place reinforced concrete structure system, the prefabricated concrete structure system has many advantages. The prefabricated concrete structure is produced in a centralized way in a component factory, has the advantages of high industrialization degree, small site construction noise and pollution, high efficiency, short construction period, easy control of product quality, high utilization rate of building materials and the like, and the industrial production enables the control and the recycling of waste water and waste materials to be realized easily. In addition, the fabricated building can overcome seasonal limitation of building construction, and prefabricated parts can be continuously produced all year round and can also be installed in winter; the standard or universal shaped prefabricated part can be produced in large scale, and the construction cost is further reduced; the external wall cladding adopting the prefabricated parts can be embedded into heat-insulating materials more conveniently, thereby realizing energy conservation and environmental protection. The adoption of the prefabricated structure is beneficial to promoting the healthy and efficient development of the building industry, improving the quality and safety of building engineering, realizing the transformation and upgrading of the building industry and the modernization of the building industry and meeting the green development requirement of 'four sections and one environment protection' in China.
The key to the prefabricated building concrete structure is its connection technology, in which steel bar sleeve grouting connection is a popular way of application. The sleeve grouting joint is a combination assembled by a specially processed sleeve, matched grouting materials and reinforcing steel bars, and the reinforcing steel bars and the sleeve are connected by means of bonding and meshing action between materials through injecting quick-hardening and non-shrinkage grouting materials when the reinforcing steel bars are connected. The steel bar sleeve grouting connection has the advantages of convenience in construction, reliable performance, economy, durability and the like, can well solve the key technology of the fabricated concrete structure, and is a commonly adopted mode for longitudinal stressed steel bar connection in the current engineering.
The connection node of the prefabricated part is a theoretical weak link of an assembled concrete structure, so that the grouting connection quality of the steel bar sleeve directly influences the safety of the structure. Research shows that the grouting defect has great influence on the bearing capacity and the deformation performance of the steel bar sleeve grouting connection test piece. However, in the actual engineering, due to the problems of technology, management, worker responsibility and the like, the grouting quality of the steel bar sleeve is difficult to guarantee.
In conclusion, whether a grouting compactness detection method which is simple and effective and does not damage the sleeve can be formed becomes an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide an in-situ radial compression detection device for a grouting void of a steel bar connecting sleeve and a using method thereof, which can quickly, simply and conveniently judge whether the grouting sleeve has the void defect on site and judge the size and the position of the void defect.
In order to achieve the above purpose, the solution of the invention is:
a steel bar connecting sleeve grouting and void defect in-situ radial compression detection device comprises a detection part and a loading part, wherein the detection part comprises an L-shaped support, a hydraulic jack, a split type LVDT displacement sensor, a clamp, a data line, an iron core connecting rod connecting piece, a twist lock and a leather hose, the L-shaped support is fixed at the front end of the hydraulic jack, and the L-shaped support and the hydraulic jack form a C-shaped clamp; the LVDT displacement sensor is fixed on the hydraulic jack by a clamp, an iron core connecting rod of the split type LVDT displacement sensor is connected with a piston rod of the hydraulic jack by an iron core connecting rod connecting piece, the iron core connecting rod connecting piece and the iron core connecting rod are completely fixed, and the iron core connecting rod is also connected with an iron core inside the LVDT displacement sensor; the rotary lock is fixed at the front end of the jack and used for fixing the iron core connecting rod connecting piece, when the iron core connecting rod connecting piece is fixed by the rotary lock, the iron core connecting rod connecting piece and the piston rod slide relatively, and when the iron core connecting rod connecting piece is not fixed by the rotary lock, the movement of the iron core connecting rod connecting piece and the movement of the piston rod are kept consistent; the loading part comprises a data line, a leather hose, an LVDT displacement data display instrument, a pressure gauge and a manual pump, wherein the pressure gauge is fixed at the interface of the front end of the manual pump; the leather hose is connected with a manual pump and a hydraulic jack; and the data line is connected with the data display instrument and the LVDT displacement sensor.
The height of the body of the hydraulic jack is 100-200mm, and the outer diameter is 40-60 mm; the length of the L-shaped support is 100-150mm, the width is 50-100mm, the cross section width is 10-30mm, and the cross section height is 10-30 mm.
And cylindrical pressure heads are respectively arranged on the opposite surfaces of the L-shaped support and the piston rod of the hydraulic jack.
The clamp comprises a fixing ring and a clamping part, wherein the fixing ring is sleeved on the hydraulic jack, the clamping part is fixed on the fixing ring, and the clamping part is provided with a through hole for the LVDT displacement sensor to pass through and an adjusting part for adjusting the diameter of the through hole.
The use method of the in-situ radial compression detection device for the grouting and void defects of the steel bar connecting sleeve comprises the following steps:
step 1, checking whether the spin lock fixes the iron core connecting rod connecting piece at the top end part of the hydraulic jack, if not, rotating the spin lock to fix the iron core connecting rod connecting piece, and adjusting the position of an LVDT displacement sensor to enable an internal iron core to be located at a proper position;
step 2, shaking a handle of the manual pump, pushing a piston rod forwards by oil pressure, and stopping shaking the handle of the manual pump when the sleeve to be grouted is clamped by the L-shaped support and the piston rod of the hydraulic jack and is not easy to be separated;
and 3, releasing the fixation of the spin lock on the iron core connecting rod connecting piece, reading data displayed by the LVDT displacement data display instrument, and recording the data as U1；
Step 4, shaking the handle of the manual pump to continuously increase the load of the L-shaped support and the piston rod on the grouting sleeve, and stopping shaking the handle of the manual pump when the pressure on the pressure gauge reaches a specified value;
and 5, reading data displayed by the LVDT displacement data display instrument and recording the data as U2；
Step 6, after the detection is finished, rotating the unloading valve to enable oil to flow back until the indication number on the pressure gauge is zero, then returning the piston rod, and finally rotating the spin lock to fix the iron core connecting rod connecting piece;
and 7, marking the deformation amount of the grouting sleeve after the loading is finished as U, wherein the U is U2-U1。
In the step 3 and the step 5, after the indication of the LVDT displacement data display instrument is stable, reading is carried out.
After the scheme is adopted, the method applies certain transverse loads to different positions of the grouting sleeve by using an in-situ radial pressurization method, and judges the size and the position of the grouting and void defect of the sleeve by detecting the transverse deformation of the sleeve; the size of the transverse load is determined according to the indication number of a pressure gauge, and the size of the transverse deformation of the sleeve is measured by an LVDT displacement sensor. The method can quickly, simply and conveniently judge whether the grouting sleeve has the void defect on site and judge the size and the position of the void defect.
The invention has the beneficial effects that:
(1) the field detection is rapid and convenient, the operation steps are simple, and the operation is very easy to operate;
(2) the device has simple structure, the main parts are ready-made commodities, independent production is not needed, the production and the processing of other parts are easy, the final assembly is also very simple, and the popularization is easy;
(3) the device is suitable for detecting grouting sleeves of different sizes, and has good adaptability;
(4) the device has high detection precision and good detection effect.
Drawings
FIG. 1 is a three-dimensional view of the apparatus of the present invention;
FIG. 2 is a front view of the detection portion of the apparatus of the present invention;
FIG. 3 is a top view of the detection portion of the apparatus of the present invention;
FIG. 4 is a left side view of the detection portion of the apparatus of the present invention;
FIG. 5 is a cross-sectional view of the detection portion of the device of the present invention;
FIG. 6 is a three-dimensional view of the detection portion of the device of the present invention in an experimental state;
FIG. 7 is a front view of the detecting part of the device of the present invention in a test state;
FIG. 8 is a plan view of the detecting part of the device of the present invention in a test state.
Detailed Description
The device for detecting grouting void defect in-situ radial compression of a steel bar connecting sleeve and the method for using the same according to the present invention will be further described with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and can implement the same.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
As shown in fig. 1 to 8, the present invention provides an in-situ radial compression detection apparatus for grouting void defects of a steel bar connecting sleeve, which comprises a detection part a and a loading part B, wherein data reading is completed in the loading part B. The detection part A comprises an L-shaped support 1, a hydraulic jack 2, a split type LVDT displacement sensor 3, an LVDT displacement sensor clamp 4, a data line 5, an iron core connecting rod connecting piece 6, a spin lock 7 and a leather hose 8, wherein the L-shaped support 1 is fixed at the front end of the jack 2, and the L-shaped support and the leather hose form a C-shaped clamp; the LVDT displacement sensor 3 is fixed on the jack 2 by a clamp 4; the iron core connecting rod 301 is connected with the piston rod 201 through an iron core connecting rod connecting piece 6; the iron core connecting rod 301 is connected with an inner iron core 302 of the LVDT displacement sensor; the rotary lock 7 is fixed at the front end of the jack 2. The loading part B comprises a data line 5, a leather hose 8, an LVDT displacement data display instrument 9, a pressure gauge 10 and a manual pump 11, wherein the pressure gauge 10 is fixed at the interface at the front end of the manual pump 11; the leather hose 8 is connected with the manual pump 11 and the jack 2; the data line 5 is connected with the data display instrument 9 and the LVDT displacement sensor 3; the power supply of the data display 9 is not shown in the figure.
The height of the body of the hydraulic jack 2 is 100-200mm (preferably 145mm), and the outer diameter is 40-60mm (preferably 55 mm).
The L-shaped support 1 has a length of 100-150mm (preferably 124mm), a width of 50-100mm (preferably 82.5mm), a cross-sectional width of 10-30mm (preferably 20mm), and a cross-sectional height of 10-30mm (preferably 24 mm). The cylindrical ram 101 inside the L-shaped support 1 and the cylindrical ram 202 at the end of the piston rod 201 together apply a lateral load to the sleeve. The cross-sectional dimensions of the cylindrical indenters 101 and 202 are 3-5mm (preferably 4mm) in diameter and 3-5mm (preferably 4mm) in height.
The split LVDT displacement sensor 3 has a length of 50-200mm (preferably 80mm), a resolution of 0.1 μm and an accuracy of 0.1% F.S. The inner iron core of the LVDT displacement sensor 3 is fixed by the iron core connecting rod 301 and is not contacted with the inner wall of the LVDT displacement sensor 3.
The iron core connecting rod connecting piece 6 and the iron core connecting rod 301 are completely fixed, and the iron core connecting rod connecting piece 6 and the piston rod 201 are not completely fixed, so that slippage can occur.
The tightness of the clamping of the LVDT displacement sensor 3 by the clamp 4 is adjustable by a screw 401, before the start of the detection, the screw 401 is loosened, then the position of the LVDT displacement sensor 3 is adjusted to position the inner core 302 in the proper position, and finally the screw 401 is tightened.
When the iron core connecting rod connecting piece 6 is fixed by the rotary lock 7, the iron core connecting rod connecting piece 6 does not move along with the piston rod 201, and when the iron core connecting rod connecting piece 6 is not fixed by the rotary lock 7, the movement of the iron core connecting rod connecting piece 6 is consistent with that of the piston rod 201.
The invention also provides a using method of the grouting and void defect in-situ radial compression detection device for the steel bar connecting sleeve, which comprises the following steps of:
1) adjusting: checking whether the spin lock 7 fixes the iron core connecting rod connecting piece 6 at the end part of the jack 2, if not, rotating the spin lock 7 to fix the iron core connecting rod connecting piece 6, then unscrewing the screw 401, then adjusting the position of the LVDT displacement sensor 3 to enable the inner iron core 302 to be located at a proper position, avoiding exceeding the measuring range in the detection process, and finally screwing the screw 401;
2) clamping: the manual pump handle 1101 is shaken, oil pressure pushes the piston rod 201 forwards, and when the sleeve C to be grouted is clamped by the pressure head 101 and the pressure head 202 and is not easy to separate, the shaking of the handle 1101 is stopped;
3) reading: reversely rotating the rotary lock 7, releasing the fixation of the rotary lock 7 on the iron core connecting rod connecting piece 6, reading the data displayed by the LVDT displacement data display instrument 9, and recording the data as U1；
4) Loading: shaking the handle 1101 of the manual pump to increase the load of the pressure head 101 and the pressure head 202 on the grouting sleeve, and stopping shaking the handle 1101 when the pressure on the pressure gauge reaches a specified value;
5) reading: reading the data displayed by the LVDT displacement data display instrument 9 and recording the data as U2；
6) Unloading: after the detection is finished, the unloading valve 1102 is rotated to enable oil to flow back until the reading on the pressure gauge 10 is zero, then the piston rod 201 is reset, and finally the rotary lock 7 is rotated to fix the iron core connecting rod connecting piece 6;
7) and (3) calculating: the deformation amount of the grouting sleeve C after the loading is finished is marked as U, and the U is equal to U2-U1。
In step 2), the clamping force on the grouting sleeve C is not required to be too large, and the loading can be stopped as long as the pressing head 101 and the pressing head 202 contact the grouting sleeve C.
In step 3) and step 5), the reading should be performed after the reading of the data display 9 is stabilized.
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides a radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing which characterized in that: the device comprises a detection part and a loading part, wherein the detection part comprises an L-shaped support, a hydraulic jack, a split type LVDT displacement sensor, a clamp, a data line, an iron core connecting rod connecting piece, a twist lock and a rubber tube, wherein the L-shaped support is fixed at the front end of the hydraulic jack, and the L-shaped support and the hydraulic jack form a C-shaped clamp; the LVDT displacement sensor is fixed on the hydraulic jack by a clamp, an iron core connecting rod of the split type LVDT displacement sensor is connected with a piston rod of the hydraulic jack by an iron core connecting rod connecting piece, the iron core connecting rod connecting piece and the iron core connecting rod are completely fixed, and the iron core connecting rod is also connected with an iron core inside the LVDT displacement sensor; the rotary lock is fixed at the front end of the jack and used for fixing the iron core connecting rod connecting piece, when the iron core connecting rod connecting piece is fixed by the rotary lock, the iron core connecting rod connecting piece and the piston rod can slide relatively, and when the iron core connecting rod connecting piece is not fixed by the rotary lock, the movement of the iron core connecting rod connecting piece and the movement of the piston rod are kept consistent; the loading part comprises a data line, a leather hose, an LVDT displacement data display instrument, a pressure gauge and a manual pump, wherein the pressure gauge is fixed at the interface of the front end of the manual pump; the leather hose is connected with a manual pump and a hydraulic jack; and the data line is connected with the data display instrument and the LVDT displacement sensor.
2. The detection device of claim 1, wherein: the height of the body of the hydraulic jack is 100-200mm, and the outer diameter is 40-60 mm; the length of the L-shaped support is 100-150mm, the width is 50-100mm, the cross section width is 10-30mm, and the cross section height is 10-30 mm.
3. The detection device of claim 1, wherein: and cylindrical pressure heads are respectively arranged on the opposite surfaces of the L-shaped support and the piston rod of the hydraulic jack.
4. The detection device of claim 1, wherein: the clamp comprises a fixing ring and a clamping part, wherein the fixing ring is sleeved on the hydraulic jack, the clamping part is fixed on the fixing ring, and the clamping part is provided with a through hole for the LVDT displacement sensor to pass through and an adjusting part for adjusting the diameter of the through hole.
5. The use method of the grouting void defect in-situ radial compression detection device for the steel bar connection sleeve as claimed in claim 1, is characterized by comprising the following steps:
step 1, checking whether the spin lock fixes the iron core connecting rod connecting piece at the top end part of the hydraulic jack, if not, rotating the spin lock to fix the iron core connecting rod connecting piece, and adjusting the position of an LVDT displacement sensor to enable an internal iron core to be located at a proper position;
step 2, shaking a handle of the manual pump, pushing a piston rod forwards by oil pressure, and stopping shaking the handle of the manual pump when the sleeve to be grouted is clamped by the L-shaped support and the piston rod of the hydraulic jack and is not easy to be separated;
and 3, releasing the fixation of the spin lock on the iron core connecting rod connecting piece, reading data displayed by the LVDT displacement data display instrument, and recording the data as U1；
Step 4, shaking the handle of the manual pump to continuously increase the load of the L-shaped support and the piston rod on the grouting sleeve, and stopping shaking the handle of the manual pump when the pressure on the pressure gauge reaches a specified value;
and 5, reading data displayed by the LVDT displacement data display instrument and recording the data as U2；
Step 6, after the detection is finished, rotating the unloading valve to enable oil to flow back until the indication number on the pressure gauge is zero, then returning the piston rod, and finally rotating the spin lock to fix the iron core connecting rod connecting piece;
and 7, marking the deformation amount of the grouting sleeve after the loading is finished as U, wherein the U is U2-U1。
6. Use according to claim 5, characterized in that: and in the step 3, reading after the reading of the LVDT displacement data display instrument is stable.
7. Use according to claim 5, characterized in that: in the step 5, reading is carried out after the reading of the LVDT displacement data display instrument is stable.
CN201911291868.0A 2019-12-16 2019-12-16 Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing Pending CN111044379A (en)

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CN201911291868.0A CN111044379A (en) 2019-12-16 2019-12-16 Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing

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CN201911291868.0A CN111044379A (en) 2019-12-16 2019-12-16 Radial compression detection device of steel bar connection sleeve grout defect normal position that comes to nothing

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112611553A (en) * 2020-11-30 2021-04-06 山东省建筑科学研究院有限公司 In-situ detection device and method for steel bar sleeve connecting piece

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112611553A (en) * 2020-11-30 2021-04-06 山东省建筑科学研究院有限公司 In-situ detection device and method for steel bar sleeve connecting piece

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