CN205421039U - A anchor structure for reinforcing T roof beam FRP - Google Patents

Abstract

The utility model relates to an anchor structure especially relates to an anchor structure for reinforcing T roof beam FRP, and it includes that T roof beam beam rib bottom is equipped with blocking material FRP sheet, its FRP sheet lower extreme be equipped with the clamp plate, this clamp plate is gone up end band screwed U type screw rod by two at least and is held in the palm the hoop, just U type screw rod upper end equally divide and do not pass T roof beam pterygoid lamina and last along behind the roof, fasten by gasket and nut. The utility model discloses utilizing frictional resistance, adhesion stress to reach good anchoring effect, both having avoided the secondary damage by the reinforced structure, anchor structure itself can not take place fragility again to be destroyed in the twinkling of an eye, has in the construction simply, convenient, does not receive the characteristics that influence season, and the industrialization degree is higher, very easily uses widely.

Description

An Anchor Structure for Strengthening T-beam FRP

technical field

The utility model relates to an anchoring structure, in particular to an anchoring structure for strengthening T-beam FRP, which belongs to the fields of buildings and bridges.

Background technique

In order to make the reinforced FRP sheet work together with the reinforced beam and prevent the FRP sheet from peeling off from the bottom of the beam during work, anchoring measures are generally applied to the FRP sheet. As we all know, the main stress-bearing part of the T-beam is the beam rib, and the wing plate is the roadway slab, which is the non-main stress-bearing part. Under the long-term load, the T-beam beam ribs will have cracks and large deflection, and the bearing capacity will decrease. Therefore, it is necessary to strengthen the beam ribs. The following methods are usually adopted in the prior art:

The first method is to embed the screw rod and the narrow steel plate, as shown in Figure 1, and the second method is to anchor the U-shaped steel plate on the outside, as shown in Figure 2, the two methods are to embed the screw rod 4 into the rib 6 of the T-beam. Two forms: one is pre-embedding. The so-called pre-embedding means that the screw rod 4 is pre-embedded in the T-beam during the T-beam pouring construction. This form can only be realized in the laboratory, and it is impossible to consider it at the beginning of construction in actual engineering The problem of reinforcement in the future; the second is post-positioning. The so-called post-positioning is to drill holes in the reinforced T-beam beam rib 6, then place the screw 4 in the hole, and fix the screw 4 in the hole with glue or other fillers. Engineering reinforcement can only adopt this form, which requires drilling holes in the beam ribs. On the one hand, it will cause damage to the beam rib concrete, and on the other hand, the steel bars in the beam are densely distributed. Setting the screw causes secondary damage to the originally damaged beam rib. Especially for the second method, although the U-shaped steel plate 302 can be effectively anchored, no matter how the nuts are tightened, there is no compression effect on the FRP sheet 2 reinforced at the bottom of the beam. Therefore, the anchoring effect of the reinforcement material at the bottom of the beam mainly depends on the force of the epoxy resin glue 5 .

In addition, the above two methods not only have long construction period and complicated process, which will cause secondary damage to the reinforced beam, but also cause brittle failure of the reinforcement device, that is, if the screw filler does not fix the screw well, the anchor device may be damaged. It will be pulled out, resulting in peeling brittle failure together with the reinforcement material. And the screw needs to be deeply buried and multi-point anchored, because when the FRP is anchored, the nut is tightened and the stiffened screw will not be pulled out. The screw needs to be buried deeply. The deeper the screw is buried, the more serious the damage to the beam rib will be; The strip is narrow and the anchoring force is limited, so multi-point anchoring is required, and if the anchoring device is installed at multiple points, it will cause secondary damage to the reinforced beam in multiple places, thus forming a vicious circle.

Contents of the invention

The utility model aims at the defects or deficiencies in the above-mentioned prior art, and provides a structure with reasonable structure, no brittle failure of the anchoring structure, no damage to the reinforced T-beam, strong versatility, simple construction and high degree of industrialization. Anchoring structure for strengthening T-beam FRP.

The purpose of this utility model is achieved by the following technical solutions:

An anchoring structure for reinforcing T-beam FRP, comprising a reinforcing material FRP sheet at the bottom of the T-beam rib, wherein: the lower end of the FRP sheet is provided with a pressing plate; the pressing plate has at least two upper ends with threads The U-shaped screw hoop, and the upper ends of the U-shaped screw pass through the T beam wing plate and the upper edge top plate respectively, and are fastened by gaskets and nuts.

There is also an epoxy resin adhesive layer between the FRP sheet and the pressing plate.

The epoxy resin adhesive layer is a carbon fiber cloth impregnated adhesive layer.

The above-mentioned pressing plate is provided with an arc-shaped notch in a matching shape at the contact part with the U-shaped screw.

The gasket is a spring gasket.

Both the pressure plate and the upper edge top plate are made of high-quality carbon structural steel plates or other steel plates.

The U-shaped screw adopts R235 steel bar.

Due to the adoption of the above structure, the utility model has the following advantages and effects compared with the prior art:

Because the utility model adopts the rectangular pressing plate pasting and the U-shaped screw rod to compress the reinforced FRP sheet, the U-shaped screw rod passes through the arc-shaped gap of the rectangular pressing plate, and is fixed and hooped on the rib of the T-beam beam, and passes through the T-beam wing at the same time. The plate is pre-drilled and tightened with a nut to tighten the reinforced rectangular plate to anchor the FRP sheet. This anchoring method utilizes the frictional resistance between the rectangular bottom plate, the FRP sheet and the T-beam rib, and the filling ring between the three. The bonding force of epoxy resin, its anchoring effect is good, and the anchoring structure does not undergo brittle instant failure; the U-shaped screw is hooped on the T-beam beam rib, without drilling the beam rib and embedding the screw, and the main force-bearing part of the T-beam There is no secondary damage to the beam ribs; the above-mentioned top and bottom steel plates and screws set at suitable positions can be factory-processed, and the nuts and spring washers are standard parts, which effectively improves the work efficiency, so the industrialization of device accessories Higher; the accessories of the utility model are easy to assemble at the construction site, convenient for construction, not affected by seasons, simple in structure, and have good economic and social benefits.

Description of drawings

Fig. 1 is the structure schematic diagram of embedded screw rod and narrow strip steel plate of prior art;

Fig. 2 is a structural schematic diagram of an outer anchor U-shaped steel plate in the prior art;

Fig. 3 is a front structural schematic diagram of the anchoring structure of the present invention;

Fig. 4 is a schematic diagram of the left view of Fig. 3 of the anchoring structure of the utility model;

Fig. 5 is a top view structural schematic diagram of Fig. 3 of the anchoring structure of the utility model;

Fig. 6 is a structural schematic diagram of the pressing plate of the anchoring structure of the present invention.

The main components in the figure: T-beam wing plate 1, FRP sheet 2, narrow steel plate 301, U-shaped steel plate 302, screw rod 4, epoxy resin glue 5, T-beam beam rib 6, pressure plate 7, U-shaped screw rod 8, Upper edge top plate 9, epoxy resin adhesive layer 10.

detailed description

The utility model is further described in detail below in conjunction with specific embodiments, but the protection scope of the present utility model is not limited by the specific embodiments, and the claims shall prevail. In addition, under the premise of not violating the technical solution of the utility model Any modifications or changes made to the utility model that are easily realized by those skilled in the art can fall within the scope of the claims of the utility model.

Example 1

As shown in Figures 3, 4, 5, and 6, a kind of anchorage structure for reinforcing T-beam FRP of the present utility model includes a prestressed reinforcing material FRP sheet 2 at the bottom of T-beam beam rib 6, and the FRP The lower end of the sheet 2 is provided with a pressing plate 7; between the FRP sheet 2 and the pressing plate 7, there is also a carbon fiber cloth impregnated adhesive layer 10 belonging to A-grade epoxy resin glue, and the pressing plate 7 is composed of two U-shaped screws 8 with threads on the upper end. hoop, and the upper ends of the U-shaped screw 8 pass through the T beam wing plate 1 and the upper edge top plate 9 respectively, and are fastened by spring washers and nuts, and the contact parts of the pressure plate 7 and the U-shaped screw 8 are provided with matching shapes. arc notch. Both the pressure plate 7 and the upper edge top plate 9 are made of No. 45 steel plates, and the U-shaped screw 8 is made of R235 steel bars.

Example 2

The utility model is an anchoring structure for reinforcing T-beam FRP, which comprises the reinforcement material FRP sheet 2 pasted on the bottom of the T-beam rib 6, and the lower end of the FRP sheet 2 is provided with a pressing plate 7; the FRP sheet 2 and the pressing plate Also be provided with epoxy resin adhesive layer 10 between 7, be fastened by gasket and bolt, described pressure plate 7 and upper edge top plate 9 all adopt No. 20 steel plates. Others are the same as in Embodiment 1, and will not be repeated.

Example 3

The utility model is an anchoring structure for strengthening T-beam FRP, which comprises a reinforcing material FRP sheet 2 at the bottom of the T-beam rib 6, and both the pressure plate 7 and the upper edge top plate 9 are made of No. 20 steel plates. Others are the same as in Embodiment 1, and will not be repeated.

Example 4

The utility model is an anchoring structure for strengthening T-beam FRP, which comprises a prestressed reinforcing material FRP sheet 2 pasted on the bottom of the T-beam rib 6, and the pressure plate 7 and the upper edge top plate 9 are all made of 40Cr steel plates. Others are the same as in Embodiment 1, and will not be repeated.

When the utility model is specifically used: it is necessary to pre-coat the epoxy resin adhesive layer 10 on the reinforced material FRP2 and the upper surface of the pressure plate 7 of the rib bottom of the reinforced T beam, and set the pressure plate 7 with an arc-shaped gap horizontally on the bottom of the reinforced T beam. At the fitting position of the bottom of the reinforcement material FRP sheet, pass the U-shaped screw 8 through the pre-punched notch of the pressure plate 7, and at the same time hoop it on the rib of the T-beam, and continue to pass through the pre-drilled hole of the T-beam wing plate and the upper edge top plate upwards 9. Pre-punching holes; tighten the protruding U-shaped screw rod 8 on the upper edge top plate 9 with nuts and spring washers, so that it can be strengthened to support the rectangular pressure plate 7, thereby forming an upper edge top plate around the reinforced T beam rib 9. A closed structure of the pressure plate 7 and the left and right U-shaped screw 2 hoops, as the nuts and spring washers are tightened, the U-shaped screw 8 continues to rise and hold the pressure plate 7, so that the pressing force of the pressure plate 7 on the FRP sheet is continuously increased The frictional resistance increases continuously, and at the same time, the epoxy resin adhesive layer 10 is filled into the small gap between the rib bottom reinforcement material FRP2 of the T-beam and the pressure plate 7 to generate adhesive force, so that the whole structure can play a firm anchoring role.

The utility model utilizes frictional resistance and cohesive force to achieve a good anchoring effect, which not only avoids secondary damage to the reinforced structure, but also does not cause brittle instant damage to the anchoring structure itself, and is simple and convenient in construction, and is not affected by seasons. The characteristics of influence are very easy to promote and use.

Claims (7)

1. An anchoring structure for reinforcing T-beam FRP, comprising a reinforcing material FRP sheet (2) at the bottom of the T-beam rib (6), characterized in that: the lower end of the FRP sheet (2) is provided with Pressing plate (7); the pressing plate (7) is supported by at least two U-shaped screw rods (8) with threaded upper ends, and the upper ends of the U-shaped screw rods (8) respectively pass through the T-beam wing plate (1) And the top plate (9) on the upper edge, fastened by washers and nuts. 2. An anchoring structure for strengthening T-beam FRP according to claim 1, characterized in that there is an epoxy resin adhesive layer (10) between the FRP sheet (2) and the pressing plate (7) ). 3. An anchoring structure for strengthening T-beam FRP according to claim 2, characterized in that the epoxy resin adhesive layer (10) is a carbon fiber cloth impregnated adhesive layer. 4. An anchoring structure for strengthening T-beam FRP according to claim 1, characterized in that said pressure plate (7) is provided with a matching arc-shaped notch at the contact part with the U-shaped screw (8) . 5. An anchoring structure for reinforcing T-beam FRP according to claim 1, characterized in that said washer is a spring washer. 6. An anchoring structure for strengthening T-beam FRP according to claim 1, characterized in that both the pressure plate (7) and the upper edge top plate (9) are made of high-quality carbon structural steel plates or other steel plates. 7. An anchoring structure for strengthening T-beam FRP according to claim 1, characterized in that said U-shaped screw (8) adopts R235 steel bar.