CN212513995U - FRP rib tension load-holding device - Google Patents

Abstract

The FRP rib tension load-holding device is characterized by comprising four FRP ribs, a connecting sleeve, a bonding sleeve, connecting rods, a twisted steel bar and steel plates, wherein two ends of the twisted steel bar respectively penetrate through the two steel plates, and a finish rolling nut is screwed on the inner side end of the twisted steel bar corresponding to the steel plates; two ends of the FRP rib are respectively fixedly connected with a bonding sleeve, and the two bonding sleeves are respectively connected with the connecting rod through connecting sleeves; the end parts of the two connecting rods are respectively fixed with a spherical hinge, and the two steel plates are respectively provided with a groove internally provided with a corresponding spherical hinge so as to facilitate the rotation of the spherical hinges. The steel sheet adopts the steel preparation of stainless steel, adopts the hand to twist finish rolling nut and applys the load, and slightly rotatory finish rolling nut realizes the fine setting to the load, and the adapter sleeve through pasting the foil gage is simultaneously load sensor and records load numerical value.

Description

FRP rib tension load-holding device

Technical Field

The utility model belongs to the technical field of civil engineering tests, concretely relates to FRP muscle is drawn and is held lotus device.

Background

The Fiber Reinforced Plastic (FRP) is a novel composite material prepared by taking continuous fibers as a reinforcement and polymer resin as a matrix through the processes of soaking, curing and the like. FRP consists of three parts: continuous fibers, resin matrix, and fiber/resin interface. Wherein, the continuous fibers are uniformly dispersed in the resin matrix, and the resin matrix is in linkage and synergistic stress. The FRP rib pultrusion process is that under the action of the pulling force of a tractor, continuous fiber yarn bundles are sequentially subjected to the steps of gum dipping, surface treatment, preforming, curing molding, cutting and the like to finally obtain an FRP product. The FRP has the advantages of light weight, high strength, fatigue resistance, corrosion resistance, designability, easy processing and the like, and can replace steel to reinforce a concrete structure.

The method for accurately measuring the basic mechanical property of the FRP rib, particularly the mechanical property of the FRP rib in an erosion environment, is a foundation for applying the FRP rib in the civil engineering construction field. At present, most of related researches on the durability of the FRP ribs are to directly perform mechanical property tests after the FRP ribs are placed in an erosion environment for a period of time. Therefore, development and application of the FRP rib test device based on durability have important practical value.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the research of FRP muscle tensile strength, provide a neotype hold lotus device, aim at realizing that the FRP muscle is holding lotus under the erosion service environment to record its durability after the erosion environment effect, mainly be the mechanical properties that is drawn.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

the FRP rib tension load-holding device is characterized by comprising four FRP ribs, a connecting sleeve, a bonding sleeve, connecting rods, a twisted steel bar and steel plates, wherein two ends of the twisted steel bar respectively penetrate through the two steel plates, and a finish rolling nut is screwed on the inner side end of the twisted steel bar corresponding to the steel plates; two ends of the FRP rib are respectively fixedly connected with a bonding sleeve, and the two bonding sleeves are respectively connected with the connecting rod through connecting sleeves; the end parts of the two connecting rods are respectively fixed with a spherical hinge, and the two steel plates are respectively provided with a groove internally provided with a corresponding spherical hinge so as to facilitate the rotation of the spherical hinges.

Furthermore, the FRP ribs and the bonding sleeves are connected through the internal filling structural adhesive.

Furthermore, the outer surface of one of the connecting sleeves is smooth and is adhered with a strain gauge, and the strain gauge is connected with the resistance strain gauge through a connecting lead.

Furthermore, the twisted steel is a prestressed finish-rolled twisted steel.

Furthermore, the steel plate is a variable cross-section steel plate, and a steel washer is arranged between the finish rolling nut and the variable cross-section steel plate.

Furthermore, a reinforcing circular steel tube is fixedly connected to the variable cross-section steel plate and is sleeved on the end portion of the corresponding connecting rod.

Furthermore, four rectangular stiffening rib steel plates are fixedly connected to the variable cross-section steel plates and are evenly distributed along the circumferential direction of the reinforced circular steel tube, and the reinforced circular steel tube and the variable cross-section steel plates are supported in four directions.

The steel sheet adopts the steel preparation of stainless steel, adopts the hand to twist finish rolling nut and applys the load, and slightly rotatory finish rolling nut realizes the fine setting to the load, and the adapter sleeve through pasting the foil gage is simultaneously load sensor and records load numerical value.

The beneficial effects of the utility model reside in that:

1. the utility model has simple structure and easy operation;

2. the nut is screwed manually to enable the steel plate to be pushed stably to apply tension to the FRP ribs, and the spherical hinges at the end parts can rotate when encountering eccentric force, so that adverse effects on tests caused by the eccentric tension are avoided, the FRP ribs are guaranteed to be applied with axial tension, and the long-term load holding aim is realized;

3. a continuous load can be applied to the test piece without using a reaction frame, and the connecting sleeve adhered with the strain gauge is also used as a load sensor, so that the space occupied by the loading device and the test cost are greatly reduced;

4. the material is made of corrosion-resistant material, so that the material is not easy to rust; after the test piece is kept loaded, the test piece is placed into an erosion environment simulation device (such as a freeze-thaw test box, a carbonization box, a chloride salt and sulfate erosion solution environment and the like) so that the test piece is in a state of coupling action of load and an erosion environment, and the service stress state of the erosion environment is simulated.

The utility model provides a more novel simple and convenient swift device realizes that the FRP muscle is being held the lotus. The whole device is placed in an erosion environment, the FRP ribs are in a load and erosion environment coupling action state, and the actual erosion environment service stress state is simulated. The method for sticking the resistance strain gauge on the connecting sleeve with the internal threads and the smooth outer surface enables the connecting sleeve to be used as a load sensor without adopting an independent load sensor, simplifies a test device, and reduces the cost problem that a large number of load sensors are occupied when the load is held for a long time. The sleeve load holding device is simple to operate and can effectively keep tension.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a steel washer;

FIG. 4 is a schematic view of a finish rolling nut;

in the figure: 1 is the FRP muscle, 2 is the bonding sleeve, and 3 is the connecting sleeve, and 4 are the connecting rod, and 5 are reinforcing circular steel tube, and 6 are rectangle stiffening rib steel sheet, and 7 are the ball pivot, and 8 are prestressing force finish rolling twisted steel, and 9 are the steel washer, and 10 are the finish rolling nut, and 11 are the foil gage, and 12 are resistance strain gauge, and 13 are connecting wire.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the FRP bar tensile load-holding device comprises an FRP bar 1, a bonding sleeve 2, a connecting sleeve 3, a connecting rod 4, a reinforced circular steel tube 5, a rectangular stiffening rib steel plate 6, a spherical hinge 7, a prestressed finish-rolled twisted steel bar 8, a steel washer 9, a finish-rolled nut 10, a strain gauge 11, a resistance strain gauge 12 and a connecting wire 13.

The utility model provides a sleeve divide into the bonding sleeve of outband screw thread and take internal thread's connecting sleeve, bonding sleeve 2 has two, fixes respectively at 1 both ends of FRP muscle through the encapsulating.

For the right half of the device, the connecting sleeve 3 is internally threaded and has a smooth outer surface, and the bonding sleeve 2 and the connecting rod 4 are connected together through the connecting sleeve 3; the connecting rod is made of steel and is integrated with the spherical hinge at the end part of the right half part.

As shown in fig. 2, the round reinforcing steel pipe 5 is fixed with the variable cross-section steel plate at the end of the spherical hinge 7, and is sleeved on the connecting rod 4 (the connecting rod has enough length for subsequent tests), and a certain distance is left between the connecting rod 4 and the round reinforcing steel pipe; the rectangular stiffening rib steel plate 6 is used for connecting the reinforcing circular steel tubes 5 in four directions, so that the positions of the spherical hinges 7 are reinforced (the groove positions of the spherical hinges of the steel plate are ensured not to be locally damaged), and the spherical hinge positions are prevented from being locally damaged; and the reinforcing circular steel tube and the connecting sleeve are separated by a certain distance, so that the connection can rotate freely (the spherical hinge 7 can rotate under the action of eccentric force).

The end part of the spherical hinge is a variable cross-section steel plate with four corners provided with round preformed holes, the variable cross-section steel plate is a part of the spherical hinge (the steel plate is provided with a groove at the contact part with the spherical hinge so as to facilitate the rotation of the spherical hinge), the four corners are provided with four preformed holes for the prestressed finish rolling threaded steel bars to pass through, and the variable cross-section steel plate is designed to be heavy for avoiding the larger thickness of the steel plate.

The left half of this device is identical to the right half of the device described above.

Four pre-stressed finish rolling twisted steel bars 8 respectively penetrate reserved holes at four corners of the left variable cross-section steel plate and the right variable cross-section steel plate; as shown in fig. 3, the steel washer 9 is circular and is arranged between the variable cross-section steel plate and the finish rolling nut 10, the inner diameter of the steel washer is slightly larger than the diameter of the prestressed finish rolling twisted steel 8, and the outer diameter of the steel washer is larger than the diameter of the circumscribed circle of the finish rolling nut 10; the finish rolling nut 10 connects the prestress finish rolling twisted steel 8 with the left and right variable cross-section steel plates, and the finish rolling nut 10 is a hexagon nut.

The two connecting rods 4 are respectively integrated with the spherical hinges 7 at the left end and the right end. A certain distance is reserved between the reinforcing circular steel tube 5 and the connecting sleeve 3. The preformed hole on the variable cross-section steel plate at the end part of the spherical hinge 7 is a circular through hole, and the diameter of the preformed hole is larger than that of the prestress finish rolling twisted steel 8.

And a strain gage 11 is pasted on the surface of the connecting sleeve 3 of the right half part of the device and is also used as a load sensor. The strain gauge 11 is connected with the resistance strain gauge 12 through the connecting wire 13, the connecting sleeve 3 is pulled when the load is held, the tensile strain can be displayed by the resistance strain gauge 12, the tensile strain is converted into the tensile force applied to the connecting sleeve 3 through calculation, and the tensile force applied to the connecting sleeve 3 is the continuous load applied to the FRP rib.

The device is made of corrosion-resistant stainless steel materials, and the durability of the device is not reduced under the action of an erosion environment.

The utility model discloses when normal use state, last load is realized through four inboard finish rolling nuts 10 of rotatory right-hand member variable cross section steel sheet simultaneously, applys outside power to the variable cross section steel sheet through rotatory finish rolling nut 10, drives connecting rod 4, connecting sleeve 3, bonding sleeve 2 atress in proper order, makes FRP muscle 1 pull, and left end variable cross section steel sheet has restricted the removal that the sleeve 2 was bonded in the left side simultaneously, and then the realization is to holding lotus of FRP muscle 1. The fine adjustment of the load is achieved by slightly rotating the finish rolling nut 10. During the test, the resistance strain gauge 12 values were observed until the designed holding value was reached. In the load holding process, the parallelism of the left variable cross-section steel plate surface and the right variable cross-section steel plate surface is ensured. Then, the FRP ribs are loaded and then placed into an erosion environment simulation device (such as a freeze-thaw test box, a carbonization box, a chloride salt and sulfate erosion solution environment and the like), and placed for a preset time.

Finally, the present invention is not limited to the above embodiments, and many variations can be made on the basis of the essential contents of the present invention, and all variations directly suggested by those skilled in the art on the basis of the contents of the present invention should be considered as the protection scope of the present invention.

Claims (6)

1. The FRP rib tension load-holding device is characterized by comprising four FRP ribs, a connecting sleeve, a bonding sleeve, connecting rods, a twisted steel bar and steel plates, wherein two ends of the twisted steel bar respectively penetrate through the two steel plates, and a finish rolling nut is screwed on the inner side end of the twisted steel bar corresponding to the steel plates; two ends of the FRP rib are respectively fixedly connected with a bonding sleeve, and the two bonding sleeves are respectively connected with the connecting rod through connecting sleeves; the end parts of the two connecting rods are respectively fixed with a spherical hinge, and the two steel plates are respectively provided with a groove internally provided with a corresponding spherical hinge so as to facilitate the rotation of the spherical hinges; the FRP ribs and the bonding sleeves are connected through the internal filling structural adhesive.
2. 2. The FRP rib tension load-holding device as claimed in claim 1, wherein the outer surface of one of the connection sleeves is smooth and is adhered with a strain gauge, and the strain gauge is connected with a resistance strain gauge through a connection wire.
3. 3. The FRP rib tension load-sustaining device as set forth in claim 1, wherein the deformed bars are pre-stressed finish-rolled deformed bars.
4. 4. The FRP rib tension load-holding device as claimed in claim 1, wherein the steel plate is a variable cross-section steel plate, and a steel washer is provided between the finish rolling nut and the variable cross-section steel plate.
5. 5. The FRP rib tensile loading device of claim 4, wherein the variable cross-section steel plate is fixedly connected with a round reinforcing steel pipe, and the round reinforcing steel pipe is sleeved on the end part of the corresponding connecting rod.
6. 6. The FRP rib tension loading device as claimed in claim 5, wherein four rectangular stiffening rib steel plates are fixedly connected to the variable cross-section steel plates, and are uniformly distributed along the circumferential direction of the round reinforced steel pipe for supporting the round reinforced steel pipe and the variable cross-section steel plates in four directions.

Images