Prestressed fiber reinforced composite material grid reinforcing device with sliding rails

Abstract

The utility model discloses a prestress fiber reinforced composite material grid reinforcing device with a sliding rail. The prestress fiber reinforced composite material grid reinforcing device comprises an FRP grid, an anchorage device, a supporting plate, a counter-force plate, a jack and a tensioning screw. The anchorage device comprises a cover plate, a lining plate is arranged below the cover plate, and the FRP grid is located between the cover plate and the lining plate. First threaded holes for fixing the FRP grids are formed in the cover plate and the lining plate; anchoring blocks are arranged on the two sides of the cover plate, and second threaded holes for installing tensioning screws are formed in the two sides of the anchoring blocks and the two sides of the supporting plate. The counter-force plate is inserted into one end of the tensioning screw rod; the bottom of the lining plate is connected with a sliding block; a groove for placing an anchorage device is formed in the middle of the supporting plate; a through groove is formed in the bottom of the supporting plate, and sliding rails are arranged on the two sides of the through groove. The sliding block penetrates through the through groove and is clamped into the sliding rail. A sliding groove is formed in the sliding rail. The anchorage device and the supporting plate are connected through the sliding rails, the maximum stress of the FRP grid during reinforcement is limited to be the maximum static friction force between the anchorage device and the supporting plate, and secondary damage to the structure caused by damage of the FRP grid is avoided.

Description

Technical Field

[0001] The utility model relates to a reinforcement device for controlling reinforcement strength and avoiding fracture of a fiber reinforced composite material FRP grid in the technical field of beam and slab repair and reinforcement, in particular to a prestressed fiber reinforced composite material grid reinforcement device with a slide rail. Background Art

[0002] The current design benchmark service life of buildings is 50 years. With the continuous increase in new buildings, the number of old buildings to be reinforced and renovated is also increasing. At the same time, aging caused by chemical and physical factors is also increasing, and the adjustment of building functions also requires the reinforcement of the original building structure. It is becoming increasingly important to choose a safe and fast reinforcement method to reinforce the original building structure to meet people's needs for building safety, durability, and adaptability.

[0003] Common reinforcement methods include external steel plates, FRP plates, carbon fiber cloth, etc. Although their material properties are superior, whether they are effective in external reinforcement depends on the performance of the epoxy resin itself as a binder. The construction and use environment conditions have a great impact on the performance of epoxy resin.

[0004] By combining FRP mesh with inorganic bonding materials, the light weight and high strength of FRP materials and the permeability of the mesh structure's pores to the inorganic bonding materials on both sides can improve the integrity of the structure. Prestressing the FRP mesh can effectively limit the development of cracks and repair existing cracks, but there is a lack of effective methods for applying prestress to the FRP mesh, the anchoring efficiency is low, and because the FRP mesh is brittle when it fails, it is easy to cause secondary damage to the structure.

[0005] In order to increase the safety reserve space of FRP grid prestress, avoid the damage of FRP grid, and ensure the ductility of the structure to ensure the predictability of damage, it is necessary to propose a better reinforcement system for prestressed FRP grid. Utility Model Content

[0006] Purpose of the utility model: The utility model aims to provide a prestressed fiber reinforced composite material FRP grid reinforcement device with a slide rail, so as to achieve the effect of controlling the reinforcement strength and avoiding the fracture of the FRP grid, solve the problem of low anchoring efficiency of the existing FRP grid prestressed anchor, and provide more sufficient safety reserve space for the structure; at the same time, the bolts on the slide rail are used to slide when the axial force of the FRP grid reaches the maximum static friction force of the bolt, thereby reducing the deformation of the FRP grid, thereby reducing the force on the FRP grid, and continuously maintaining the reinforcement effect of the maximum static friction force, and avoiding the influence of FRP grid damage on the structure.

[0007] Technical solution: The utility model of the prestressed fiber reinforced composite mesh reinforcement device with a slide rail comprises an FRP mesh, an anchor, a support plate, a reaction plate, a jack and a tensioning screw;

[0008] The anchor comprises a cover plate, a lining plate is arranged below the cover plate, and the FRP mesh is located between the cover plate and the lining plate; a first threaded hole for fixing the FRP mesh is provided on the cover plate and the lining plate;

[0009] Anchor blocks are provided on both sides of the cover plate, and second threaded holes for installing tensioning screws are provided on both sides of the anchor blocks and the support plate; the reaction plate is inserted through one end of the tensioning screw; and the jack is located between the reaction plate and the support plate;

[0010] The bottom of the lining plate is connected with a sliding block, and a third threaded hole is opened on the sliding block;

[0011] A groove for placing an anchor is provided in the middle of the support plate; a through groove is provided at the bottom of the support plate, and slide rails are provided on both sides of the through groove; the slide block passes through the through groove and is inserted into the slide rail;

[0012] A slide groove is provided on the slide rail; pre-tightening bolts are installed in the slide groove and the third threaded hole;

[0013] The two wings of the support plate are provided with fourth threaded holes for fixing the support plate.

[0014] The groove in the middle of the supporting plate is a U-shaped groove.

[0015] The FRP grid is a grid structure composed of multiple groups of cross-limbs and longitudinal limbs.

[0016] The spacing between the horizontal and vertical limbs is a fixed size.

[0017] The slide rail is composed of two plates with slide grooves, that is, the slide grooves are provided on the plates.

[0018] The ends of the cover and liner are flush.

[0019] The thickness of the anchor block is less than the total thickness of the cover plate, FRP grid and liner.

[0020] The anchor is located at one end of the groove of the support plate.

[0021] The two wing surfaces of the support plate are flush with the top of the cover plate.

[0022] The cross section of the slide groove is a rectangle with rounded corners, and the width of the slide groove is the same as the size of the third threaded hole on the slider.

[0023] Working principle: The tensioning end of the FRP grid of the prestressed fiber reinforced composite grid reinforcement device with slide rails of the utility model is anchored by an anchor, and the first row of cross limbs is cut off; the anchor is composed of a cover plate and a liner, a slider is provided at the bottom of the liner, and a screw hole for placing pre-tightening bolts is provided on the slider. The middle part of the support plate is a U-shaped groove for placing the anchor, and a slide rail for inserting the slider at the bottom is provided, and the connection between the slider and the slide rail is controlled by the pre-tightening bolts. The jack is placed between the reaction plate and the support plate, and the tensioning screw rods are inserted on both sides of the reaction plate, the support plate, and the anchor plate to tension the FRP grid.

[0024] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0025] (1) The utility model utilizes bolts on the slide rails to fix the anchors through friction. During the reinforcement stage, when the axial force of the FRP grid reaches the maximum static friction force of the bolts, the FRP grid slides instead of being destroyed. The deformation of the FRP grid is reduced by shortening the displacement, so as to reduce the stress on the FRP grid. When the stress is reduced, the sliding stops, and the reinforcement effect of the maximum static friction force is continuously maintained. The influence of the FRP grid destruction on the structure is avoided, so as to achieve the effect of controlling the reinforcement strength and avoiding FRP fracture.

[0026] (2) During the processing of the prestressed fiber reinforced composite material FRP grid reinforcement device with slide rails of the utility model, the longitudinal limbs slip at the anchoring end, and the first row of transverse limbs cannot slide synchronously due to the anchoring, causing the longitudinal limbs to be subjected to bidirectional tension, which is not conducive to the application of prestress. During installation, the first row of transverse limbs are cut off, which improves the prestressed anchoring efficiency of the FRP grid, provides more sufficient safety reserve space for the structure, and at the same time ensures the ductility of the structure to ensure the predictability of damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the prestressed fiber reinforced composite material grid reinforcement device with a slide rail of the utility model;

[0028] Figure 2 It is a schematic diagram of the utility model grid without cutting;

[0029] Figure 3 It is a schematic diagram of grid cutting of the utility model;

[0030] Figure 4 It is a schematic diagram of the structure of the anchor of the utility model;

[0031] Figure 5 This is a schematic diagram of the slide rail on the support plate of the utility model;

[0032] Figure 6 It is a side view of the support plate of the utility model;

[0033] Figure 7It is a bottom schematic diagram of the beam and slab reinforcement of the utility model;

[0034] Figure 8 It is a bottom schematic diagram after the beam and slab reinforcement of the utility model is completed. DETAILED DESCRIPTION

[0035] Example:

[0036] like Figures 1 to 5 As shown, the prestressed fiber reinforced composite material FRP grid reinforcement device with a slide rail of the utility model comprises an FRP grid 1, an anchor 2, a support plate 3, a reaction plate 4, a jack 5 and a tensioning screw 13.

[0037] The FRP grid 1 is a two-dimensional grid-shaped FRP product formed by high-performance continuous fibers of carbon fiber, basalt fiber, glass fiber or polyamide fiber impregnated in a resin with good corrosion resistance and cured. In this embodiment, the FRP grid 1 adopts an orthogonal bidirectional form, and is composed of multiple groups of horizontal limbs and vertical limbs arranged crosswise, and the spacing between each horizontal limb and the vertical limb is a fixed size. In the utility model, the first row of horizontal limbs 6 of the FRP grid 1 in the anchor 2 is cut off, and the first row of horizontal limbs 6 is the first row of horizontal limbs 6 in the anchor 2 that is biased towards the fixed end.

[0038] The anchor 2 includes a cover plate 7 and a lining plate 8. In this embodiment, the cover plate 7 and the lining plate 8 are square plates with the same length and width. The cover plate 7 and the lining plate 8 are provided with first threaded holes on the upper and lower parts, and the FRP mesh 1 is anchored by countersunk bolts 14. The FRP mesh 1 is located between the cover plate 7 and the lining plate 8. The cover plate 7 is located above the FRP mesh 1, and the lining plate 8 is located below the FRP mesh 1. The front and rear ends of the cover plate 7 and the lining plate 8 are flush. The position of the first threaded hole ensures that all FRP meshes 1 are clamped by double-row countersunk bolts 14, that is, countersunk bolts 14 are clamped on both sides of any FRP mesh 1.

[0039] Anchor blocks 12 are welded on both sides of the cover plate 7, and the thickness of the anchor blocks 12 is less than the total thickness of the cover plate 7, the FRP mesh 1 and the lining plate 8. A second threaded hole for installing a tensioning screw 13 is provided in the anchor block 12. The tensioning screw 13 is longer than the reaction plate 4 to the end of the anchor 2. A slider 9 is provided on the lower side of the lining plate 8, and a third threaded hole is provided on the slider 9.

[0040] The anchor 2 of the anchored FRP mesh 1 is placed in the groove of the support plate 3. The length of the groove is greater than the length of the cover plate 7, the width of the groove is equal to the width of the cover plate 7, and the depth is equal to the thickness of the cover plate 7, the FRP mesh 1 and the lining plate 8 after superposition. The anchor 2 is located at the end of the groove of the support plate 3, and there is a pre-tensioned displacement space with the groove back plate. The bottom of the lining plate 8 is attached to the bottom surface of the groove of the support plate 3, the FRP mesh 1 is located on the top surface of the lining plate 8 and the bottom surface of the cover plate 7, and the height of the two wings of the support plate 3 is flush with the top height of the cover plate 7. A through groove is opened at the bottom of the support plate 3, and the length of the through groove is the length of the groove, that is, the distance from the front end of the support plate 3 to the end of the groove of the support plate 3.

[0041] Slide rails 11 are provided on both sides of the through groove at the bottom of the support plate 3. The slide rails 11 are composed of two full-length steel plates. A slide groove is provided on the steel plate. The slide groove is a rounded rectangle. The width of the slide groove is the same as the size of the third threaded hole on the slider 9. The length of the slide groove leaves sliding space for the pre-tightening bolt. The slider 9 is connected to the lining plate 8, and the slide rails 11 are connected to the support plate 3. The slider 9 is located between the two slide rails 11. The slider 9 and the slide rails 11 are connected by pre-tightening bolts 10. At this time, the pre-tightening bolts 10 are in an untightened state, and the slider 9 slides on the slide rails 11.

[0042] The two wings of the support plate 3 are provided with fourth threaded holes, and the support plate 3 is fixed to the bottom of the beam plate in the area to be reinforced by pre-tightening bolts 15. The two sides of the groove back plate of the support plate 3 are provided with second threaded holes for installing tensioning screws 13.

[0043] The tensioning screw 13 is inserted on both sides of the support plate 3 and the anchor 2. One side of the tensioning screw 13 is fixed by the second threaded hole of the anchor block 12 on both sides of the cover plate 7, and the other end of the tensioning screw 13 is inserted through the reaction plate 4. The jack 5 is placed between the reaction plate 4 and the back of the support plate 3. The position of the reaction plate 4 and the jack 5 is fixed by the nut 16 and the gasket 17. The jack 5 is used to push the reaction plate 4 to drive the tensioning screw 13 and the anchor 2. The FRP mesh 1 is tensioned by the clamping force of the cover plate 7 and the lining plate 8 on the FRP mesh 1 in the anchor 2, and the slider 9 on the lining plate 8 also moves in the slide rail 11. When the FRP mesh 1 reaches the expected prestressed position, the pre-tightening bolt 10 is tightened, and the slider 9 is fixed on the slide rail 11 by the pre-tightening bolt 10. The pre-tightening prestress is borne by the maximum static friction force generated by the pre-tightening bolt 10 and the slide rail 11. The grade and number of the pre-tightening bolts 10 are determined by the required reinforcement force. The reinforcement force is the sum of the prestress and the structural force. The maximum static friction force generated by all the pre-tightening bolts 10 is the maximum tension that the reinforcement system can withstand. Remove the jack 5 and the reaction plate 4, and cut off the redundant tensioning screws 13. When the beam and slab deform, the FRP grid 1 increases its deformation, resulting in an increase in the load at both ends of the anchor 2. When the load of the anchor 2 is greater than the maximum static friction force generated by the pre-tightening bolts 10, the slider 9 slides, and the static friction turns into sliding friction. The deformation of the FRP grid 1 becomes smaller, and the internal load of the FRP grid 1 also decreases. When the load of the anchor 2 is lower than the sliding load of the pre-tightening bolts 10, the sliding stops, and the tensioning effect of the maximum static friction continues to be maintained.

Claims

1. A prestressed fiber reinforced composite mesh reinforcement device with a slide rail, characterized in that: It comprises an FRP grid (1), an anchor (2), a support plate (3), a reaction plate (4), a jack (5) and a tensioning screw (13); The anchor (2) comprises a cover plate (7), a lining plate (8) is provided below the cover plate (7), and the FRP grid (1) is located between the cover plate (7) and the lining plate (8); a first threaded hole for fixing the FRP grid (1) is provided on the cover plate (7) and the lining plate (8); Anchor blocks (12) are provided on both sides of the cover plate (7); second threaded holes for installing tensioning screws (13) are provided on both sides of the anchor blocks (12) and the support plate (3); the reaction plate (4) is inserted through one end of the tensioning screw (13); and the jack (5) is located between the reaction plate (4) and the support plate (3); The bottom of the lining plate (8) is connected to a slider (9), and the slider (9) is provided with a third threaded hole; A groove for placing the anchor (2) is provided in the middle of the support plate (3); a through groove is provided at the bottom of the support plate (3), and slide rails (11) are provided on both sides of the through groove; the slide block (9) passes through the through groove and is inserted into the slide rail (11); The slide rail (11) is provided with a slide groove; the slide groove and the third threaded hole are provided with pre-tightening bolts; The two wings of the support plate (3) are provided with fourth threaded holes for fixing the support plate (3).

2. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The groove in the middle of the support plate (3) is a U-shaped groove.

3. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The FRP grid (1) is a grid structure composed of a plurality of groups of cross-limbs and cross-limbs.

4. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 3, characterized in that: The distance between the horizontal limbs and the vertical limbs is a fixed size.

5. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The slide rail (11) is composed of two plates with slide grooves.

6. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The two ends of the cover plate (7) and the lining plate (8) are flush.

7. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The thickness of the anchor block (12) is less than the total thickness of the cover plate (7), the FRP grid (1) and the lining plate (8).

8. The prestressed fiber reinforced composite mesh reinforcement device with a slide rail according to claim 1, characterized in that: The anchor (2) is located at one end portion in the groove of the support plate (3).

9. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The two wing surfaces of the support plate (3) are flush with the top of the cover plate (7).

10. The prestressed fiber reinforced composite material grid reinforcement device with a slide rail according to claim 1, characterized in that: The cross section of the slide groove is a rectangle with rounded corners.

Images