CN112611553A - In-situ detection device and method for steel bar sleeve connecting piece - Google Patents
In-situ detection device and method for steel bar sleeve connecting piece Download PDFInfo
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- CN112611553A CN112611553A CN202011372913.8A CN202011372913A CN112611553A CN 112611553 A CN112611553 A CN 112611553A CN 202011372913 A CN202011372913 A CN 202011372913A CN 112611553 A CN112611553 A CN 112611553A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
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Abstract
The invention relates to an in-situ detection device and method for a steel bar sleeve connecting piece, which comprises an anchor and two pressing plates which are arranged up and down and the middle parts of the two pressing plates are connected through a supporting piece, wherein the two ends of the supporting piece are hinged with the adjacent pressing plates, one end of each pressing plate is provided with an opening, the two openings are positioned on the same side of the supporting piece, steel bars at the upper end and the lower end of the steel bar sleeve can be respectively accommodated in the openings, and the anchor can be fixed outside the steel bars at the upper end of the steel; the other end of the pressing plate is provided with an external force loading mechanism which can apply external force so that the two pressing plates can move in the direction away from each other at the end with the opening; the external force loading mechanism and the supporting piece are respectively provided with a pressure sensing assembly, and the pressure sensing assemblies can detect the magnitude of loaded external force and the magnitude of pressure applied to the supporting piece so as to convert the tension applied to the reinforcing steel bar.
Description
Technical Field
The invention belongs to the technical field of detection, and particularly relates to an in-situ detection device and method for a steel bar sleeve connecting piece.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the later 60 s of the 20 th century, the american scientist beheshu (dr. alfed a. yee) invented a steel bar sleeve connector, and then grouting technology was used, and was first applied to the prefabricated column connection of 38-storey prefabricated buildings, the alamoanara hotel, and opened the way for connecting steel bars in vertical concrete structures through the sleeve grouting technology. Over the next decades, sleeve grouted joints have been widely used in industrial construction in the european and american countries.
The technology is improved in Japan, the building height using the sleeve grouting connection technology reaches more than 200 meters at most, and other high-rise and ultra-high-rise fabricated concrete buildings adopting the technology withstand the great earthquake.
In 2011, the Wanke group adopts a sleeve grouting connection technology in the Shenyang Wanke spring river inner frame system apartment building project. In recent years, grouting sleeve products are developed by a plurality of enterprises in China, the sleeve grouting connection technology also becomes an important construction technology in the prefabricated building in China, and a steel bar sleeve grouting connection application technical regulation (JGJ355-2015) is compiled for the organization related to housing and urban and rural construction departments.
The steel bar sleeve connection is a common connection mode of the prefabricated vertical concrete components. The sleeve connection may have the following problems: firstly, the sleeve is unqualified; unqualified sleeve threading; thirdly, the steel bar mantle fiber is unqualified; fourthly, weakening the cross section when threading the reinforcing steel bar; the steel bar is unqualified; sixthly, the length of the inserted bar is not enough; seventhly, the sleeve is not full; eighthly, grouting the sleeve to be not compact; ninthly, bleeding of the grouting material; the grouting material in the red (r) is not qualified, etc. The unqualified steel bar sleeve connecting piece can bring great potential safety hazard to the engineering, even become the danger building.
The inventor knows that the integral performance test of the reinforcing steel bar sleeve connecting piece is not required in the existing specification, and part of research tests are that the reinforcing steel bar sleeve is completely taken out from the prefabricated wall body and is pulled on a testing machine for testing, so that the wall body is seriously damaged, greatly disturbed and difficult to recover, and the method cannot be used on a large scale, and is not representative.
Disclosure of Invention
The present invention is directed to an in-situ detection apparatus and method for a steel sleeve connector, which can solve at least one of the above problems.
In order to achieve the above object, a first aspect of the present invention provides an in-situ detection apparatus for a steel bar sleeve connector, including an anchor and two pressing plates which are arranged up and down and connected by a supporting member at the middle part, wherein two ends of the supporting member are hinged to adjacent pressing plates, one end of the pressing plate is provided with an opening, the two openings are located at the same side of the supporting member, steel bars at the upper and lower ends of the steel bar sleeve can be respectively accommodated in the opening, and the anchor can be fixed outside the steel bars at the upper end of the steel bar sleeve to realize the position limitation;
the other end of the pressing plate is provided with an external force loading mechanism which can apply external force so that the two pressing plates can move in the direction away from each other at the end with the opening;
the external force loading mechanism and the supporting piece are respectively provided with a pressure sensing assembly, and the pressure sensing assemblies can detect the magnitude of loaded external force and the magnitude of pressure applied to the supporting piece so as to convert the tension applied to the reinforcing steel bar.
As a further improvement, the end, far away from the opening, of the pressing plate is provided with a screw rod, one end of the screw rod is fixed at the end of the pressing plate below, the other end of the screw rod penetrates through the pressing plate above and extends upwards, a screw cap is installed at the upper end of the screw rod, a hollow jack is sleeved outside the screw rod, and the hollow jack is arranged between the screw cap and the pressing plate above.
As a further improvement, the length of the section of the pressure plate far away from the opening is larger than that of the section of the pressure plate near the opening by taking the supporting piece as a boundary.
The invention provides an in-situ detection method for a steel bar sleeve connecting piece, which comprises the following steps:
step 1, at the position where the wallboard is provided with the steel bar sleeve connecting piece, the measuring groove is upwards removed from the floor slab, the steel bar sleeve connecting piece in the wallboard is exposed, and the steel bar on the upper part of the steel bar sleeve connecting piece is cut off from the set height position of the top end of the sleeve.
and 3, applying pressure close to each other to one ends, far away from the opening, of the two pressing plates by using an external force loading mechanism, wherein the ends, with the opening, of the two pressing plates can draw the steel bar along the axial direction of the steel bar sleeve.
And 4, loading the external force loading mechanism to a damage state in a grading manner, and recording the damage reason and the critical drawing force of the pressure sensor assembly during damage.
And 5, heating the upper wall overhanging steel bars after the test, and then snapping the upper wall overhanging steel bars back to the original positions, and connecting the upper wall overhanging steel bars and the upper residual steel bars of the steel bar sleeve connecting piece again by adopting a method of binding and welding steel bars with the same diameter.
And 6, repairing the wall by adopting grouting material.
The beneficial effects of one or more of the above technical solutions are as follows:
the invention adopts two pressing plates, one end of each pressing plate is provided with an opening, so that the pressing plates can be conveniently stretched into the in-situ measuring groove of the wall body, the steel bars at the opening of the upper pressing plate are fixed by an anchorage device, and the lower pressing plate is free and applies drawing force and can be used as the basis for in-situ detection of the steel bar sleeve connecting piece.
The adoption uses support piece as the boundary, and the length of clamp plate at a section of keeping away from the opening is greater than the length of clamp plate at a section of being close to the opening, is convenient for utilize the clamp plate to enlarge the external force that external force loading mechanism applyed, obtains bigger pulling force.
In this embodiment, adopt the mode of seting up the measurement groove in situ, only need cut the reinforcing bar on reinforcing bar muffjoint spare upper portion, need not take out reinforcing bar muffjoint spare completely, destroy little, the disturbance is less, easily resumes, can directly know reinforcing bar muffjoint spare's mechanical properties, provides the basis for the reinforcement of prefabricated wall body.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic view of the overall structure in use in embodiment 1 of the present invention.
FIG. 2 is a schematic structural view of a first presser plate in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a second pressing plate in embodiment 1 of the present invention.
In the figure: 1. a screw; 2. a nut; 3. a first pressure sensor; 4. a hollow jack; 5. a first platen; 6. a boss; 7. a second platen; 701. a second plate member; 8. a floor slab; 9. a first plate member; 9A, opening; 10. floor slab reinforcing steel bars; 11. a sleeve; 12. a wallboard; 13. overhanging reinforcing steel bars; 14. residual reinforcing steel bars; 14A, an anchorage device; 15. a hinged support; 16. a support member; 17. a second pressure sensor; 18. and (6) measuring the groove.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
The embodiment provides an in-situ detection device for a steel bar sleeve connecting piece, which comprises an anchorage 14A and two pressing plates which are arranged up and down and connected through a supporting piece 16 in the middle, wherein two ends of the supporting piece 16 are hinged with adjacent pressing plates, one end of each pressing plate is provided with an opening 9A, the two openings 9A are positioned on the same side of the supporting piece 16, steel bars at the upper end and the lower end of the steel bar sleeve can be respectively accommodated in the openings 9A, and the anchorage 14A can be fixed outside the steel bars at the upper end of the steel bar sleeve to realize the limiting of the;
the other end of the pressing plate is provided with an external force loading mechanism which can apply external force so that the two pressing plates can move in the direction away from each other at the end with the opening 9A;
the external force loading mechanism and the support piece 16 are respectively provided with a pressure sensing assembly, and the pressure sensing assembly can detect the magnitude of loaded external force and the magnitude of pressure applied to the support piece 16 so as to convert the tension applied to the steel bar.
The central axes of the two pressure plates are in the same vertical plane, and the rotation direction of the pressure plate hinged with the support 16 is vertical to the vertical plane of the central axes of the pressure plates. The length of the pressure plate at the section far from the opening 9A is longer than that of the pressure plate at the section near the opening 9A by taking the supporting piece 16 as a boundary, so that the lever effect can be realized, and a larger drawing force can be obtained by a smaller external loading force. The lower pressing plate comprises a first plate 9 and a second plate 701 which are arranged in a stepped mode, and the first plate 9 is located below the second plate 701.
The embodiment provides a structural style of cavity jack 4 as outside loading system, the one end that opening 9A was kept away from to the clamp plate is equipped with screw rod 1, and the tip at the below clamp plate is fixed to screw rod 1's one end, and the other end runs through the top clamp plate and stretches out upwards, and nut 2 is installed to screw rod 1's upper end, and the outside cover of screw rod 1 is equipped with cavity jack 4, and cavity jack 4 sets up between nut 2 and top clamp plate.
It is understood that the hollow jack 4 is a jack with a through hole in the middle, and the prior art can be used, and the detailed description is omitted here. The hollow jack 4 can be replaced by an electric push rod or a hollow piston cylinder and the like, when the hollow piston cylinder is adopted, the hollow piston cylinder is directly sleeved outside the screw rod 1, and the installation of the hollow jack 4 can be referred to. When the electric push rod is adopted, the rod body end part and the piston rod end part of the electric push rod can be respectively pressed on the upper surfaces of the screw cap 2 and the first pressing plate 5.
Specifically, in this embodiment, the upper pressing plate is the first pressing plate 5 shown in the figure, the first pressing plate 5 is an integral flat plate structure, one end of the first pressing plate 5 is provided with a through hole for passing through the screw rod 1, and the other end is provided with the opening 9A. The lower pressing plate is the second pressing plate 7 shown in the drawing in the embodiment, the second pressing plate 7 comprises a whole flat plate structure, one end of the flat plate structure is provided with a raised bending plate, the raised bending plate can adopt the structural form of an L-shaped plate, one end of the L-shaped plate is vertically arranged and fixed with the end part of the flat plate structure, and the other end of the L-shaped plate horizontally extends towards the direction far away from the opening 9A. In this arrangement, the bending plates are in the stepped plate arrangement described above.
It can be understood that, in the present embodiment, in order to adjust the distance between the first pressing plate 5 and the second pressing plate 7 at the end far from the opening 9A by using the external force applied by the hollow jack 4, the lower end of the screw rod 1 and the second pressing plate 7 need to be fixed relatively in advance. Can set up an annular boss 6 at the lower extreme of screw rod 1 and be used for spacing, then pass the one end mounting nut of bent plate department through-hole downwards at screw rod 1, realize fixing through screwing up the nut.
Specifically, in this embodiment, the anchorage 14A may be fixed outside the participating reinforcing steel bars after the reinforcing steel bars on the upper portion of the reinforcing steel bar sleeve are broken, and in the process that the upper pressing plate (i.e., the first pressing plate 5) moves upward, the anchorage 14A may be pushed upward, so as to achieve upward drawing of the participating reinforcing steel bars relative to the reinforcing steel bar sleeve. Anchor 14A may be of conventional construction and will not be described in detail herein.
The pressure sensor assembly comprises a first pressure sensor 3 and a second pressure sensor 17, the first pressure sensor 3 is used for measuring the external force applied to the upper pressure plate by the jack, the second pressure sensor 17 is used for measuring the pressure applied to the supporting piece, and the difference value between the second pressure sensor 17 and the first pressure sensor 3 can represent the drawing force applied to the steel bar in the steel bar sleeve.
In this embodiment, the first pressure sensor 3 may be a hollow perforated pressure sensor with a ring structure, and the first pressure sensor 3 is disposed between the nut 2 and the hollow jack 4, and is sleeved outside the screw rod 1. The second pressure sensor 17 may be integrated in the support 16 as a pole section of the support 16.
In other embodiments, the upper end of the supporting member 16 is hinged to the middle of the upper pressing plate through a pin, and the pin is a pin sensor capable of measuring the pressure applied to the hinge point while providing the hinge. In this case, the pin sensor can be used as the second pressure sensor 17.
The upper end of the supporting piece is hinged with the middle part of the upper pressing plate, and the lower end of the supporting piece is hinged with the middle part of the lower pressing plate.
Example 2
The embodiment provides an in-situ detection method for a steel bar sleeve connecting piece, which comprises the following steps of:
step 1, at the position where the wall plate 12 has the reinforcing bar sleeve connector, the measuring groove 18 is cut upward from the floor slab 8 to expose the reinforcing bar sleeve connector in the wall plate 12, and in this embodiment, the size of the measuring groove 18 is 500mm × 100mm × 80 mm. And cutting off the upper steel bars of the steel bar sleeve connecting piece from the set height position at the top end of the sleeve 11 to obtain the overhanging steel bars 13 at the upper wall body and the residual steel bars 14 at the top end of the sleeve 11.
In this embodiment, the upper portion of the sleeve 11 is cut at a position 200mm from the top of the sleeve 11, and after the steel bar is cut, the overhanging steel bar 13 is bent to one side, so as to leave an installation space for the test.
And 2, extending one ends of the two pressing plates with the openings 9A into the measuring grooves 18, and clamping the steel bars at the upper part and the lower part of the steel bar sleeve connecting piece through the openings 9A by the two pressing plates respectively.
It can be understood that the first plate at the second pressing plate (i.e. the lower pressing plate) is in contact with the lower end of the measuring groove, and the second plate is suspended, in this case, the second plate cannot crush the floor outside the wallboard. The opening of second clamp plate department does not restrict the reinforcing bar, does not draw the reinforcing bar, only plays the effect of fulcrum, and the pulling force that the reinforcing bar received is provided by the top clamp plate (promptly first clamp plate).
Namely, the residual steel bars pass through the opening at the upper pressing plate, and the floor slab steel bars pass through the opening at the lower pressing plate.
And 3, applying mutually close pressure to the ends, far away from the opening 9A, of the two pressing plates by using an external force loading mechanism, wherein the upper pressing plate can draw the steel bar along the axial direction of the steel bar sleeve at the end with the opening 9A.
And 4, loading the external force loading mechanism to a damage state in a grading manner, wherein the damage state comprises steel bar breaking, steel bar anchoring part breaking, sleeve 11 breaking and steel bar pulling out from the sleeve 11. Recording the damage reason and the critical drawing force of the pressure sensor assembly during the damage; specifically, the pressure sensor assembly is capable of measuring the loading force F measured at the external force loading mechanism respectively1A loading force F at the support 162The steel bar sleeve connecting piece is subjected to drawing force F1And F2The difference of (a). In particular, the drawing force F to which the reinforcing steel bar at the sleeve is subjected3＝F2-F1。
And 5, heating the overhanging steel bars 13 after the test, then snapping the overhanging steel bars back to the original positions, and reconnecting the overhanging steel bars 13 and the residual steel bars 14 by adopting a method of binding and welding steel bars with the same diameter, wherein the binding and welding length is 10d, and d is the diameter of the steel bars.
And 6, repairing the wall by adopting grouting material.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. An in-situ detection device for a steel bar sleeve connecting piece is characterized by comprising an anchor and two pressing plates which are arranged up and down and connected through a supporting piece in the middle, wherein two ends of the supporting piece are hinged to the adjacent pressing plates;
the other end of the pressing plate is provided with an external force loading mechanism which can apply external force so that the two pressing plates can move in the direction away from each other at the end with the opening;
the external force loading mechanism and the supporting piece are respectively provided with a pressure sensing assembly, and the pressure sensing assemblies can detect the magnitude of loaded external force and the magnitude of pressure applied to the supporting piece so as to convert the tension applied to the reinforcing steel bar.
2. The in-situ detection device for the steel bar sleeve connecting piece according to claim 1, wherein a screw is provided at an end of the pressing plate away from the opening, one end of the screw is fixed at an end of the lower pressing plate, the other end of the screw penetrates through the upper pressing plate and extends upward, a nut is installed at an upper end of the screw, a hollow jack is sleeved outside the screw, and the hollow jack is arranged between the nut and the upper pressing plate.
3. The in-situ detection device for the steel bar sleeve connector as claimed in claim 1, wherein the pressure sensor assembly comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is used for measuring the external force applied to the upper pressure plate by the jack, the second pressure sensor is used for measuring the pressure applied to the supporting member, and the difference between the second pressure sensor and the first pressure sensor can represent the drawing force applied to the steel bar in the steel bar sleeve.
4. The in-situ detection device for the steel bar sleeve connecting piece according to claim 3, wherein the upper end of the supporting piece is hinged to the middle of the upper pressing plate through a pin shaft, the pin shaft is a pin shaft sensor, and the pin shaft sensor can measure the pressure applied to a hinge point while providing the hinge joint.
5. The in-situ detection device for the steel bar sleeve connector according to claim 3, wherein the supporting member comprises a supporting member, the second pressure sensor is disposed in the middle of the supporting member, the upper end of the supporting member is hinged to the middle of the upper pressing plate, and the lower end of the supporting member is hinged to the middle of the lower pressing plate.
6. The in-situ detection device for the steel bar sleeve connecting piece according to claim 1, wherein central axes of the two pressing plates are in the same vertical plane, and a rotation direction of the pressing plate hinged to the supporting member is perpendicular to the vertical plane in which the central axis of the pressing plate is located.
7. The in-situ test apparatus for a steel bar sleeve coupler according to claim 1, wherein the length of the pressing plate at a section far from the opening is greater than the length of the pressing plate at a section near the opening, with the supporting member as a boundary; the pressing plate located below comprises a first plate and a second plate which are arranged in a stepped mode, and the first plate is located below the second plate.
8. An in-situ detection method for a steel bar sleeve connecting piece is characterized by comprising the following steps:
at the position where the wallboard is provided with the steel bar sleeve connecting piece, a measuring groove is upwards removed from the floor slab, the steel bar sleeve connecting piece in the wallboard is exposed, and the steel bar on the upper part of the steel bar sleeve connecting piece is cut off from the set height position of the top end of the sleeve to obtain the overhanging steel bar at the upper wall body and the residual steel bar at the top end of the sleeve;
one end of each of the two pressing plates with an opening extends into the measuring groove, the two pressing plates are respectively clamped with the steel bars at the upper part and the lower part of the steel bar sleeve connecting piece through the openings, then anchorage devices are installed at the residual steel bars, and the upper pressing plate is positioned below the anchorage devices;
applying mutually close pressure to one ends of the two pressing plates far away from the opening by using an external force loading mechanism, wherein the upper pressing plate can draw the steel bar along the axial direction of the steel bar sleeve at the end with the opening;
the external force loading mechanism is loaded to a damage state in a grading way, and the damage reason and the critical drawing force measured by the pressure sensor assembly during damage are recorded;
after the test, the overhanging reinforcing steel bars are heated and then are broken back to the original position, and the overhanging reinforcing steel bars and the residual reinforcing steel bars are reconnected by adopting a method of binding and welding the reinforcing steel bars with the same diameter;
and (5) repairing the wall body by adopting grouting material.
9. The in-situ inspection method for reinforcing bar coupler sleeves according to claim 8, wherein the external reinforcing bars are bent to one side after the upper wall is cut, leaving an installation space for the test.
10. The in situ testing method for steel reinforced sleeve connectors as claimed in claim 8, wherein said pressure sensor assembly is capable of measuring a loading force F measured at said external force loading mechanism, respectively1A loading force F at the support2The steel bar sleeve connecting piece is subjected to drawing force F1And F2The difference of (a).
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| CN202011372913.8A CN112611553B (en) | 2020-11-30 | 2020-11-30 | In-situ detection device and method for steel bar sleeve connecting piece |
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| CN202011372913.8A CN112611553B (en) | 2020-11-30 | 2020-11-30 | In-situ detection device and method for steel bar sleeve connecting piece |
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