CN104264998B - For the machine drawing of FRP fixing quantity self-anchoring type prestressing force - Google Patents

Abstract

The invention discloses a self-anchored prestressed tensioner for FRP quantitative control. It is that the jack is horizontally set at the matching position at the bottom of the frame, and the two ends of the upper part of the frame are respectively equipped with turning rollers; the FRP sheet bypasses the turning rollers, and its two ends are respectively clamped in the corrugated plate clamps I and II; A pair of steering pulleys are arranged in parallel on the fixed plate at the fitting position at one end of the rack; a displacement gauge with a stylus facing upwards is set at the fitting position of the column at this end; a force measuring device is set at the fitting position at the bottom of the other end of the rack gauge; the dynamometer is connected to the end of the corrugated plate fixture II away from the FRP sheet, and the end of the corrugated plate fixture I away from the FRP sheet is provided with a pair of stretching pulleys; the force transmission steel wire rope goes around each stretching pulley and turning pulley, The two ends of the power transmission wire rope are respectively connected with the two pull rods of the jack. It effectively avoids secondary damage to the reinforced structure, and achieves real-time display of the deformation of the stretched FRP sheet, which is simple and versatile.

Description

Self-anchored prestressed tensioner for quantitative control of FRP

technical field

The invention relates to a prestressed FRP tensioning device, in particular to a self-anchored prestressed tensioning machine for FRP quantitative control.

Background technique

With the widespread use of FRP materials in the field of building reinforcement, especially in order to exert the high-strength properties of FRP, the commonly used method is to apply prestress to FRP.

Usually, the method of applying prestress to the FRP sheet mostly uses the reinforced building structure as a counter force device, and the reinforcement equipment is fixed on the reinforcement structure. This method will cause secondary damage to the reinforcement structure, and the reinforcement equipment cannot reuse. The applied prestress cannot be accurately controlled, and there is no quantitative control device for the machine tool. It is necessary to conduct tests to make an FRP tensile stress control sample table that can be used on site. It is common to produce tension tools with different parameters for different prestress forces. Insufficient sex. The measurement of the variables of the FRP sheet after the prestressing is not intuitive enough, and the deformation of the FRP cannot be directly displayed. It needs to be converted, and it is difficult to achieve a large tensile force. In addition, the current tensioning equipment is mostly used in the laboratory, and cannot be widely used in engineering practice. In engineering practice, most of them still adopt the solution of one case, one discussion, and there is no simple and feasible universal equipment.

Contents of the invention

The present invention aims at the above problems and provides a reasonable structure, which can accurately control the tension force applied during the stretching process of FRP sheets, and can apply high-level prestress, directly display the deformation of FRP sheets, and is simple to implement. , Universal self-anchored prestressed tensioner for FRP quantitative control.

The technical scheme that the present invention solves technical problem is:

It is used for quantitative control of FRP self-anchored prestressed tensioning machine, including frame, jack, corrugated plate fixture, displacement meter and dynamometer. Turning rollers are respectively provided; the FRP sheet bypasses the turning rollers, and its two ends are clamped in the corrugated plate clamps I and II respectively; a pair of turning pulleys are arranged in parallel on the fixed plate at the matching position at one end of the frame; A displacement gauge with a stylus facing upwards is provided at the fitting position of the column of the rack; a dynamometer is set at the fitting position at the bottom of the other end of the rack; The corrugated plate clamp I is provided with a pair of stretching pulleys at the end far away from the FRP sheet; the force transmission steel wire rope goes around each stretch pulley and steering pulley, and the two ends of the force transmission steel wire rope are respectively connected with the two pull rods of the jack .

The jack is a mechanical screw jack with a stroke range of 0-180mm and a horizontal thrust range of 0-160kN.

The corrugated plate fixtures I and II are both composed of two intermeshed corrugated tooth plates, which are connected as a whole by at least one bolt.

The frame is made of channel steel welded or bolted, and the four corners of the bottom are provided with leveling and moving wheels.

The moving wheel has a locking function.

Compared with the prior art, the present invention has the following advantages and effects:

The present invention uses the FRP sheet itself as a counter force device. This self-anchoring method effectively avoids secondary damage to the reinforced structure, making the stretching of the FRP sheet an independent process; the tension applied by the jack is used to , the size of the tension force can be used flexibly to generate a higher tension force; the use of the corrugated plate clamp can firmly clamp the FRP sheet without shear damage; the measuring device in the present invention can accurately control The numerical value of the tension force shows the deformation amount of the stretched FRP sheet in real time; the invention can be moved and used repeatedly, has a simple structure, strong versatility, and has good economic and social benefits.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is a left view enlarged structural schematic diagram of Fig. 1 of the present invention;

Fig. 3 is a schematic diagram of a right-view enlarged structure of Fig. 1 of the present invention;

Fig. 4 is a top view structure schematic diagram of the present invention with the FRP sheet removed.

Main parts in the figure: displacement meter 1, steering pulley 2, corrugated plate fixture Ⅰ3, steering roller 4, FRP sheet 5, frame 6, corrugated plate fixture Ⅱ7, dynamometer 8, moving wheel 9, jack 10, tie rod 11 , Power transmission wire rope 12, stretching pulley 13, jack lever 14.

detailed description

The present invention will be further described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited by the specific examples, and the claims shall prevail. In addition, on the premise of not violating the technical solution of the present invention, any modification or change made to the present invention that can be easily realized by those skilled in the art will fall within the scope of the claims of the present invention.

Example 1:

As shown in Figure 1-4, it is used for FRP quantitative control self-anchored prestressed tensioning machine, including displacement meter 1, steering pulley 2, corrugated plate clamp I 3, steering roller 4, FRP sheet 5, frame 6, waveform Plate clamp II 7, dynamometer 8, moving wheel 9, mechanical screw jack 10, pull rod 11, power transmission wire rope 12, stretching pulley 13, jack lever 14, and its mechanical screw jack 10 is horizontally arranged at the bottom of the frame 6 In the matching position, turning rollers 4 are provided at both ends of the upper part of the frame 6; A pair of steering pulleys 2 are arranged in parallel on the fixed plate of the adaptation position; a displacement gauge 2 with a stylus facing upward is arranged on the adaptation position of the column of the frame 4 at this end; Meter 8; the dynamometer 8 is connected with two connecting pulleys provided at the end of the corrugated plate fixture II7 away from the FRP sheet through bolts, and the end of the corrugated plate fixture I3 far away from the FRP sheet is provided with a pair of stretching pulleys 13 The power transmission wire rope 12 goes around each pulley 13 and each diverting pulley 2, and the two ends of the power transmission wire rope 12 are respectively connected with the two pull rods 11 of the jack 10. The stroke range of the mechanical screw jack is 0-180mm, and the horizontal thrust range is 0-160kN. The corrugated plate clamps I, II 3 and 7 are all composed of two intermeshed corrugated tooth plates, which are connected as a whole by at least one bolt. The frame 6 is welded by channel steel and connected by bolts, and the four corners of the bottom are provided with leveling and moving wheels 9 with locking functions.

When the present invention is specifically used: it is necessary to pull the jack 10 first to tighten the clamped FRP sheet 5, so that the dynamometer 8 displays a small fixed value, and then the displacement meter 1 is adjusted to zero, each time before tensioning. Use this fixed value as the initial value for zeroing of displacement meter 1. Slowly move the jack lever 11 during the stretching process, and observe the tension value displayed by the dynamometer from time to time until reaching the tension control value.

The jack 10 at the bottom of the frame 6 generates thrust to pull the power transmission wire rope 12 under the movement of the jack lever 11, and the power transmission wire rope 12 transmits the tension uniformly and centrally to the corrugated plate clamp I3 under the regulation of the stretch pulley 13. The corrugated plate clamp Ⅰ3 first clamps the FRP sheet to be stretched, and the two ends of the sheet respectively extend into the corrugated plate clamps Ⅰ, Ⅱ3, and 7 on both sides, and at the same time wrap the outer movable single-piece corrugated tooth plate for one week, and then tighten it. Fasten the bolts to clamp the FRP sheet to ensure that the FRP sheet 5 does not slip or be sheared during the stretching process. Since the corrugated plate fixture II7 is fixed, the clamped corrugated plate fixture I3 tightens the FRP sheet 5 under the pull of the force transmission wire rope 3. When moving down and pressing on the stylus of the displacement meter 1, the deformation amount can be read through the data acquisition system, that is, the tension acting on the FRP sheet 5 is displayed in real time.

The present invention generates tension through the jack, relies on self-anchoring, and can accurately control the tension system by applying prestress to the FRP sheet, which not only avoids secondary damage to the reinforced structure, but also can directly display the prestressed FRP tension in real time. Tensile force and deformation are simple and universal.

Claims (5)

1. Used for quantitative control of FRP self-anchored prestressed tensioning machine, including frame (6), jack (10), corrugated plate fixture, displacement meter (1) and dynamometer (8), characterized in that: jack (10) Horizontally set on the matching position at the bottom of the frame (6), and the upper ends of the frame (6) are respectively provided with turning rollers (4); the FRP sheet (5) bypasses the turning rollers (4) , the two ends of which are respectively clamped in the corrugated plate clamps Ⅰ, Ⅱ (3, 7); a pair of steering pulleys (2) are arranged in parallel on the fixed plate at the matching position at one end of the rack (6); the rack at this end (6) A displacement gauge (1) with a stylus facing upwards is provided at the fitting position of the column; a dynamometer (8) is set at the fitting position at the bottom of the other end of the frame (6); the dynamometer (8) is connected to the The corrugated plate fixture II (7) is connected to the end far away from the FRP sheet, and the corrugated plate fixture I (3) is provided with a pair of stretching pulleys (13) at the end far away from the FRP sheet; Stretching pulley (13) and diverting pulley (2), the two ends of the power transmission wire rope (12) are respectively connected with the two pull rods (11) of the jack (10). 2. The self-anchoring prestressed tensioning machine for FRP quantitative control according to claim 1, characterized in that the jack (10) is a mechanical screw jack, and the stroke range is between 0 and 180mm, horizontally The thrust range is 0~160kN. 3. The self-anchored prestressed tensioning machine for FRP quantitative control according to claim 1, characterized in that the corrugated plate clamps I and II (3, 7) are composed of two corrugated tooth plates meshing with each other constituted and connected as a whole by at least one bolt. 4. The self-anchored prestressed tensioning machine for FRP quantitative control according to claim 1, characterized in that the frame (6) is made of channel steel welded or bolted, and the four corners of the bottom are equipped with leveling And moving wheel (9). 5. The self-anchored prestressed tensioning machine for FRP quantitative control according to claim 4, characterized in that the moving wheel (9) has a locking function.