CN113431379A

CN113431379A - Method for reinforcing beam plate by prestress and beam plate reinforcing auxiliary device

Info

Publication number: CN113431379A
Application number: CN202110844924.XA
Authority: CN
Inventors: 叶勇; 邱锦华; 张世恒
Original assignee: Huaqiao University
Current assignee: Huaqiao University
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-09-24

Abstract

The invention discloses a method for reinforcing a beam plate by prestress and a beam plate reinforcing auxiliary device. The auxiliary device comprises a steel carrier, two anchors, two clamps, a member and an FRP (fiber reinforced plastic) rib, wherein the member is arranged above the carrier, the two anchors are fixed at two ends of the carrier in the length direction, the two clamps are respectively fixed on the back surfaces of the two anchors, a slot extending along the length direction is formed in one side surface of the member back to the carrier, an adhesive is filled in the slot, the FRP rib is arranged in the slot and is fixed with the member through the adhesive, and two ends of the FRP rib penetrate through the anchors and are fixed by the clamps to enable the FPR rib to keep a prestressed tensioning state. It has the following advantages: the reinforcing effect of the beam plate is improved.

Description

Method for reinforcing beam plate by prestress and beam plate reinforcing auxiliary device

Technical Field

The invention relates to the field of beam reinforcement, in particular to a method for reinforcing a beam plate by prestress and a beam plate reinforcement auxiliary device.

Background

In order to improve the damage form of the flexural member of the structure and improve the stress performance of the beam slab under the action of normal use load and accidental load, researchers successively put forward different reinforcing technologies and carry out experimental and theoretical researches. The technology of the existing reinforced beam slab mainly comprises reinforcement mesh modified mortar reinforcement, surface layer embedded CFRP (carbon fiber reinforced plastic) ribs, external prestress reinforcement and the like, and the technology of prefabricating the reinforced beam slab of the CFRP ribs is to form a reinforced slab (the material of the member and the reinforced slab is the same as that of the reinforced beam slab) by embedding the CFRP ribs (without prestress) on the surface layer in the prefabricated member, and the reinforced slab is adhered to the pulled bottom surface of the beam so as to realize bending resistance reinforcement. However, the existing technology for reinforcing the beam by the CFRP rib reinforcing plate is still not ideal enough, the reinforcing strength of the beam needs to be further improved, and the reinforcing effect of the beam also has an improvement space.

Disclosure of Invention

The invention provides a method for reinforcing a beam plate by prestress and a beam plate reinforcing auxiliary device, which overcome the defects of the prior art in the background art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a method for reinforcing a beam slab by prestress is to fix a reinforcing plate with FRP ribs in a tension prestress state on the tension side of the beam slab to be reinforced.

In one embodiment: the FRP ribs are CFRP ribs.

In one embodiment: the method comprises the following steps:

step 1, grooving on the surface of a component along the length direction according to the design specification, wherein the width and the depth of the section of a groove opening are matched with the diameter of an FRP rib;

step 2, blowing off residual dust on the surfaces of the slot and the component and flushing for cleaning;

step 3, after the surface of the component is dried, injecting an adhesive into the slot;

step 4, putting the FRP ribs into the grooves until the FRP ribs are completely covered by the adhesive;

step 5, tensioning the FRP ribs along the length direction to enable the FRP ribs to store elastic potential energy to form a reinforced plate with prestress;

and 6, adhering one surface of the embedded rib of the reinforcing plate to the surface of the tension area of the beam plate to be reinforced, and standing until the adhesive is cured.

In one embodiment: the width and the depth of the cross section of the notch are two times of the diameter of the FRP rib.

The auxiliary device for reinforcing the prestressed beam slab comprises a steel carrier, two anchors, two clamps, a member and an FRP (fiber reinforced plastic) rib, wherein the member is arranged above the carrier, the two anchors are fixed at two ends of the carrier in the length direction, the two clamps are respectively fixed on the back surfaces of the two anchors, a slot extending along the length direction is formed in one side surface of the member, which is back to the carrier, the slot is filled with an adhesive, the FRP rib is arranged in the slot and is fixed with the member through the adhesive, and two ends of the FRP rib penetrate through the anchors and are fixed by the clamps to enable the FPR rib to keep a prestressed tensioning state.

In one embodiment: the FRP ribs are CFRP ribs.

In one embodiment: the width and the depth of the section of the slotted groove are two times of the diameter of the FRP rib.

In one embodiment: the clamp and the anchorage device are fixed by matching a bolt and a nut.

In one embodiment: the anchorage device and the carrier are welded and fixed.

In one embodiment: the carrier is an I-beam.

Compared with the background technology, the technical scheme has the following advantages:

1. the reinforcing plate with the FRP ribs in the tensioning prestress state is fixed on the tension side of the beam plate to be reinforced, the FRP ribs in the tensioning prestress state transmit the tensioning prestress to the beam plate through the reinforcing plate, and the beam plate is relatively in an inward contraction and contraction state after receiving the prestress action of the FPR ribs, so that the beam plate can bear larger load, and the anti-deformation capacity of the beam plate is improved.

2. The prestressed beam slab reinforcing auxiliary device can enable the FRP ribs to be kept in a tensioning prestressed state before the reinforcing plate is fixed on the beam slab, so that the reinforcing operation of the prestressed FRP rib reinforcing plate on the beam slab is assisted, batch production in a factory can be realized by the prestressed beam slab reinforcing auxiliary device, the production efficiency of the prestressed reinforcing plate is improved, and the field reinforcing operation efficiency of the beam slab is further improved.

Drawings

The invention is further illustrated by the following figures and examples.

Fig. 1 is a schematic perspective view of a prestressed beam slab reinforcement auxiliary device.

Figure 2 is a front view of the anchor.

FIG. 3 is a side view of the anchor.

FIG. 4 is a top view of the anchor.

Fig. 5 is a front view of the clamp.

Fig. 6 is a side view of the clamp.

Fig. 7 is a top view of the clamp.

Fig. 8 is a cross-sectional view of the carrier.

Detailed Description

Referring to fig. 1 to 8, an auxiliary device for reinforcing a prestressed beam slab includes a steel carrier 1, two anchors 2, two clamps 3, a member 4, and an FRP rib 5, wherein the member 4 is disposed above the carrier 1, the two anchors 2 are fixed at two ends of the carrier 1 in a length direction, the two clamps 3 are respectively fixed on back surfaces of the two anchors 2, a slot 41 extending in the length direction is formed on a side surface of the member 4 opposite to the carrier 1, the slot 41 is filled with an adhesive, the FRP rib 5 is disposed in the slot 41 and fixed to the member 4 by the adhesive, and two ends of the FRP rib 5 penetrate through the anchors 2 and are fixed by the clamps 3 to keep the FPR rib 5 in a prestressed tension state. Usually, the anchorage device 2 is provided with a channel, the clamp 3 is a grooved clamp, and both ends of the FRP bar 5 respectively pass through the channel on the anchorage device 2 and then fall into the groove of the clamp 3 for fixing.

In this embodiment, the FRP rib 5 is a CFRP rib. The width and depth of the cross section of the slot 41 are both twice of the diameter of the FRP rib. The clamp 3 and the anchorage device 2 are fixed by matching bolts and nuts. The anchorage device 2 and the carrier 1 are welded and fixed. The carrier 1 is an i-beam.

The specific manufacturing process of the prestressed beam slab reinforcement auxiliary device comprises the following steps:

step 11, stably placing the component on a carrier, fixing two anchors 2 at two ends of the carrier 1 in the length direction, and respectively fixing two clamps 3 on the back surfaces of the two anchors 2;

step 12, grooving 41 on the surface of the component 4 along the length direction according to the design specification, wherein the width and the depth of the section of the groove are matched with the diameter of the FRP rib 5; generally, the width and the depth of the cross section of the notch are two times of the diameter of the FRP rib 5;

step 13, blowing off residual dust on the surfaces of the open slot 41 and the component 4 and flushing for cleaning;

step 14, after the surface of the member 4 is dried, injecting adhesive into the groove 41 to form an adhesive layer, wherein the adhesive is injected to about 1/2 groove depth;

step 15, placing the FRP ribs 5 into the grooves until the adhesive completely covers the FRP ribs 5, and enabling the two ends of the FRP ribs 5 to pass through the anchorage devices 2 and then fall on the fixture 3;

and step 15, tensioning the FRP ribs 5 along the length direction to enable the FRP ribs 5 to store elastic potential energy, fixing the FRP ribs through the clamp 3, and enabling the FRP ribs 5 to keep tensioned loading, wherein at the moment, the component 4 and the FRP ribs 5 in the component 4 form a reinforced plate with prestress, and thus, the manufacturing of the prestressed beam slab reinforcement auxiliary device is completed.

A method for reinforcing a beam slab by prestressing, in which a reinforcing plate with FRP (fibre Reinforced plastics) ribs 5 in a tensioned prestressed state is fixed to the tension side of the beam slab to be Reinforced. The FRP tendon 5 is a CFRP (carbon Fiber Reinforced plastics) tendon.

The method for reinforcing the beam plate by the prestress comprises the following steps:

step 1, grooving 41 on the surface of a component 4 along the length direction according to the design specification, wherein the width and the depth of the section of the groove are matched with the diameter of an FRP rib 5; generally, the width and the depth of the cross section of the notch are two times of the diameter of the FRP rib 5;

step 2, blowing off residual dust on the surfaces of the open slot 41 and the component 4 and flushing for cleaning;

step 3, after the surface of the member 4 is dried, injecting an adhesive into the groove 41, wherein the adhesive is injected to the depth of about 1/2 grooves;

step 4, putting the FRP ribs 5 into the grooves until the FRP ribs 5 are completely covered by the adhesive;

step 5, tensioning the FRP ribs 5 along the length direction to enable the FRP ribs 5 to store elastic potential energy, and forming a reinforced plate with prestress by the members and the FRP ribs in the members;

The prestressed beam slab reinforcing auxiliary device can keep the FRP ribs 5 in a tensioning prestressed state before the reinforcing plate is fixed on the beam slab, so that reinforcing operation of the prestressed FRP rib 5 reinforcing plate on the beam slab is assisted, batch production in a factory can be realized, and steps 1 to 5 in the method for reinforcing the beam slab can be completed through the auxiliary device in the factory. When the beam plate needs to be reinforced through prestress, the auxiliary reinforcing device for the prestressed beam plate manufactured in a factory is brought to the site, the reinforcing plate with the rib embedding surface is coated with an adhesive, then the reinforcing plate is adhered to the surface of a tension area of the beam to be reinforced, the adhesive is kept still until the adhesive is cured, then the anchor device 5, the clamp 3 and the carrier 1 are dismounted, and the process that the prestress is transmitted to the reinforced beam from the reinforcing plate is completed (in the specific force transmission process, the tensile stress on the FRP ribs 5 is transmitted to the member 4, and the member 4 is transmitted to the beam plate, so that the beam plate forms the prestress which is contracted and tightened correspondingly to the tensile stress), the reinforcing plate has a better reinforcing effect on the beam, can bear larger load and improves the deformation resistance. In the device, the anchorage device 2, the clamp 3 and the carrier 1 are all arranged for tensioning the FRP rib 5 and keeping a preset prestress level, thereby completing the manufacture of the prestressed reinforced plate.

The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. A method for reinforcing a beam plate by prestress is characterized in that: and fixing the reinforcing plate with the FRP ribs in a tensioning prestress state on the tension side of the beam plate to be reinforced.

2. The method of pre-stressing a reinforcement beam panel in accordance with claim 1, wherein: the FRP ribs are CFRP ribs.

3. A method of pre-stressing a reinforcement beam panel according to claim 1 or 2, wherein: the method comprises the following steps:

4. A method of pre-stressing a reinforcement beam panel in accordance with claim 3, wherein: the width and the depth of the cross section of the notch are two times of the diameter of the FRP rib.

5. The utility model provides an auxiliary device is consolidated to prestressed beam slab which characterized in that: the steel-made carrier, two anchors, two clamps, a member and an FRP (fiber reinforced plastic) rib are included, the member is arranged above the carrier, the two anchors are fixed at two ends of the carrier in the length direction, the two clamps are respectively fixed on the back surfaces of the two anchors, a slot extending along the length direction is formed in one side surface of the member back to the carrier, the slot is filled with an adhesive, the FRP rib is arranged in the slot and is fixed with the member through the adhesive, and two ends of the FRP rib penetrate through the anchors and are fixed by the clamps to enable the FPR rib to keep a tensioning state with prestress.

6. The pre-stressed beam slab reinforcement auxiliary device according to claim 5, wherein: the FRP ribs are CFRP ribs.

7. The pre-stressed beam slab reinforcement auxiliary device according to claim 5, wherein: the width and the depth of the section of the slotted groove are two times of the diameter of the FRP rib.

8. The pre-stressed beam slab reinforcement auxiliary device according to claim 5, wherein: the clamp and the anchorage device are fixed by matching a bolt and a nut.

9. The pre-stressed beam slab reinforcement auxiliary device according to claim 5, wherein: the anchorage device and the carrier are welded and fixed.

10. The pre-stressed beam slab reinforcement auxiliary device according to claim 5, wherein: the carrier is an I-beam.