阅读说明：本技术 T型构件的预应力frp加固结构及其施工方法 (Prestress FRP (fiber reinforced Plastic) reinforcing structure of T-shaped component and construction method thereof ) 是由 许国文 熊浩 白洁 亓立刚 黄青隆 冯俊 王彬楠 于 2021-09-07 设计创作，主要内容包括：本发明涉及一种T型构件的预应力FRP加固结构及其施工方法,T型构件包括支管以及垂直连接于支管的端部的主管,该加固结构包括：一端固定于支管的侧部的布带,该布带的另一端绕过主管并固定于支管对应的侧部,从而该布带呈U型并吊住主管,布带由FRP材料制成；固定于布带的端部且贴合于支管对应的侧部的锚板,布带的端部夹设于锚板和支管之间；以及对拉连接于相对的两块锚板的螺杆,以使得两块锚板固定连接并夹固于支管。本发明有效地解决了T型构件的焊缝处容易发生疲劳破坏的问题,通过预应力FRP布带对支管与主管之间的连接进行加固,以提升T型构件的抗拉承载力和疲劳强度,避免产生新的焊缝和焊接缺陷,保证施工质量,提升结构加固效果。(The invention relates to a prestressed FRP reinforced structure of T-shaped component and its construction method, T-shaped component includes the branch pipe and connects to the main pipe of the end of the branch pipe vertically, the reinforced structure includes: a cloth belt having one end fixed to a side portion of the branch pipe and the other end wound around the main pipe and fixed to a corresponding side portion of the branch pipe, so that the cloth belt is U-shaped and hangs the main pipe, the cloth belt being made of an FRP material; the anchor plate is fixed at the end part of the cloth belt and is attached to the side part corresponding to the branch pipe, and the end part of the cloth belt is clamped between the anchor plate and the branch pipe; and the screw rods are connected to the two opposite anchor plates in a counter-pulling mode, so that the two anchor plates are fixedly connected and clamped to the branch pipe. The invention effectively solves the problem that the welding seam of the T-shaped member is easy to generate fatigue damage, and the connection between the branch pipe and the main pipe is reinforced through the prestressed FRP cloth belt so as to improve the tensile bearing capacity and the fatigue strength of the T-shaped member, avoid generating new welding seams and welding defects, ensure the construction quality and improve the structure reinforcing effect.)

1. A prestressed FRP reinforcement structure of a T-shaped member including a branch pipe and a main pipe connected perpendicularly to an end of the branch pipe, characterized in that the reinforcement structure comprises:

a cloth belt having one end fixed to a side portion of the branch pipe and the other end wound around the main pipe and fixed to a corresponding side portion of the branch pipe, so that the cloth belt is U-shaped and hangs over the main pipe, the cloth belt being made of an FRP material;

the anchor plates are fixed at the end parts of the cloth belts and are attached to the corresponding side parts of the branch pipes, and the end parts of the cloth belts are clamped between the anchor plates and the branch pipes; and

and oppositely pulling the screw rods connected to the two opposite anchor plates so that the two anchor plates are fixedly connected and clamped to the branch pipe.

2. A prestressed FRP reinforcing structure of a T-shaped member as set forth in claim 1, wherein said anchor plates are parallel to said main pipe, and ends of said anchor plates protrude out of said branch pipes to form protrusions, said screw being connected between the protrusions of the opposite two anchor plates;

arrange in through the jacking piece protruding portion with be responsible for between, and the extension jacking piece is in order to push up protruding portion with be responsible for, make the anchor slab is followed the branch pipe is to keeping away from the direction of being responsible for removes, thereby stretch-draw the strap, and right the prestressing force is applyed to the strap, and then fixed connection the screw rod with protruding portion, so that the anchor slab clamping in the branch pipe.

3. The prestressed FRP reinforced structure of a T-shaped member as set forth in claim 2, further comprising nuts screwed to ends of said screw rods, by screwing said nuts so that said nuts abut against the corresponding said anchor plates, thereby fixing the positions of said anchor plates.

4. A prestressed FRP reinforcement structure for a T-shaped member as claimed in claim 3, further comprising a bead fixed to a side of said anchor plate remote from said branch pipe, said nut abutting against a side of said bead remote from said branch pipe.

5. A prestressed FRP reinforcement structure for T-shaped members as claimed in claim 4, characterized in that the length of said batten matches the length of said anchor plate.

6. A prestressed FRP reinforcement structure for T-shaped members as claimed in claim 3, characterized in that said battens and said anchor plates, said anchor plates and said tapes, and said tapes and said branch pipes are fixedly connected by structural adhesives.

7. A prestressed FRP reinforcing structure of a T-shaped member as set forth in claim 1, further comprising a filling layer filling a gap formed between said cloth tape and said branch pipe.

8. A prestressed FRP reinforcement structure of a T-shaped member as set forth in claim 7, characterized in that said filling layer is filled with epoxy mortar or structural adhesive.

9. A construction method of a prestressed FRP reinforced structure of a T-shaped member as set forth in claim 1, comprising the steps of:

providing the anchor plate and the cloth belt, and fixing the anchor plate on the end part of the cloth belt;

attaching one end of the cloth belt to the side part of the branch pipe, and attaching the other end of the cloth belt to the corresponding side part of the branch pipe by bypassing the main pipe, so that the cloth belt is U-shaped and hangs the main pipe, and is clamped between the anchor plate and the branch pipe;

and providing the screw rod, and connecting the screw rod drawknot between the two opposite anchor plates so that the two anchor plates are fixedly connected and clamped on the branch pipe.

10. A construction method of a prestressed FRP reinforced structure of a T-shaped member as set forth in claim 9, wherein said anchor plate is parallel to said main pipe, and an end of said anchor plate protrudes out of said branch pipe to form a protrusion;

providing a jacking piece, will the jacking piece is arranged in protruding portion with be responsible for between, the extension the jacking piece is supported in order to push up protruding portion with be responsible for, make the anchor slab is followed the branch pipe is to keeping away from the direction of being responsible for removes, thereby stretch-draw the strap, and then fixed connection the screw rod with the anchor slab, so that the anchor slab clamp in the branch pipe.

Technical Field

The invention relates to the field of structure processing, in particular to a prestress FRP (fiber reinforced Plastic) reinforcing structure of a T-shaped member and a construction method thereof.

Background

The T-shaped pipe structure is a common structural form and is widely applied to bridges and building structures, however, due to the problems of welding defects, stress concentration and the like, the fatigue performance of a welded pipe structure node is poor, and fatigue failure is easy to occur under the action of cyclic load. The traditional reinforcing method comprises the steps of welding a steel sleeve, welding a stiffening plate, arranging an external stiffening ring and the like, but new welding defects are inevitably introduced into new welding seams to form new fatigue weak points, the problem of easy fatigue failure still exists, and the construction quality and the structural strength cannot be ensured.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a prestress FRP (fiber reinforced Plastic) reinforcing structure of a T-shaped member and a construction method thereof, solves the problem that a connecting weld joint between a branch pipe and a main pipe of the T-shaped member is easy to generate fatigue damage, reinforces the connection between the branch pipe and the main pipe of the T-shaped member through an FRP (fiber reinforced Plastic) cloth belt so as to improve the tensile bearing capacity and the fatigue strength of the T-shaped member, avoids generating new weld joints and welding defects in the reinforcing process, ensures the construction quality and improves the structure reinforcing effect.

The technical scheme for realizing the purpose is as follows:

the invention provides a prestressed FRP reinforcement structure of a T-shaped component, the T-shaped component comprises a branch pipe and a main pipe vertically connected with the end part of the branch pipe, the reinforcement structure comprises:

a cloth belt having one end fixed to a side portion of the branch pipe and the other end wound around the main pipe and fixed to a corresponding side portion of the branch pipe, so that the cloth belt is U-shaped and hangs the main pipe, the cloth belt being made of an FRP material;

the anchor plate is fixed at the end part of the cloth belt and is attached to the side part corresponding to the branch pipe, and the end part of the cloth belt is clamped between the anchor plate and the branch pipe; and

and oppositely pulling the screw rods connected to the two opposite anchor plates so that the two anchor plates are fixedly connected and clamped to the branch pipe.

According to the prestress FRP reinforcing structure of the T-shaped member, one end of the cloth belt is fixed to the branch pipe, the other end of the cloth belt bypasses the main pipe and is fixed to the side part corresponding to the branch pipe, so that the cloth belt is used for hoisting the main pipe, the connecting part of the main pipe and the branch pipe is reinforced, in addition, the cloth belt and the branch pipe are clamped and fixed by the anchor plate, the cloth belt is prevented from falling off from the branch pipe, the problem that the connecting welding seam of the T-shaped member is easy to generate fatigue damage is solved, the connecting of the T-shaped member is reinforced by the FRP cloth belt, the strength of the weak point of the T-shaped member is improved, the generation of new welding seams and welding defects is avoided, the construction quality is ensured, and the structural strength is improved.

The prestressed FRP reinforcement structure of the T-shaped component is further improved in that the anchor plates are parallel to the main pipe, the end parts of the anchor plates protrude out of the branch pipes to form protruding parts, and the screw rods are connected between the protruding parts of the two opposite anchor plates;

place protruding portion in with be responsible for between through the jacking piece to the jacking piece is extended, is in order to push up protruding portion and be responsible for, makes the anchor slab move to the direction of keeping away from being responsible for along the branch pipe, thereby stretch-draw strap, and applys prestressing force to the strap, and then fixed connection screw rod and protruding portion, so that anchor slab clamping in the branch pipe.

The prestress FRP reinforcing structure of the T-shaped component is further improved in that the prestress FRP reinforcing structure further comprises a nut screwed at the end part of the screw rod, and the nut is screwed to abut against the corresponding anchor plate so as to fix the position of the anchor plate.

The prestress FRP reinforcing structure of the T-shaped component is further improved in that the prestress FRP reinforcing structure further comprises a pressing strip fixed on the side face, away from the branch pipe, of the anchor plate, and the nut abuts against the side face, away from the branch pipe, of the pressing strip.

The prestress FRP reinforcing structure of the T-shaped component is further improved in that the length of the pressing strip is matched with that of the anchor plate.

The prestress FRP reinforcing structure of the T-shaped component is further improved in that the pressing strip and the anchor plate, the anchor plate and the cloth belt, and the cloth belt and the branch pipe are fixedly connected through structural adhesive.

The prestressed FRP reinforcing structure of the T-shaped member of the invention is further improved in that the structure further comprises a filling layer for filling the gap formed between the cloth belt and the branch pipe.

The prestressed FRP reinforcing structure of the T-shaped component is further improved in that the filling layer is filled with epoxy mortar or structural adhesive.

The invention provides a construction method of a prestressed FRP (fiber reinforced Plastic) reinforcing structure of a T-shaped member, which comprises the following steps of:

providing an anchor plate and a cloth belt, and fixing the anchor plate on the end part of the cloth belt;

attaching one end of a cloth belt to the side part of the branch pipe, and attaching the other end of the cloth belt to the side part corresponding to the branch pipe by bypassing the main pipe, so that the cloth belt is U-shaped and suspends the main pipe, and is clamped between the anchor plate and the branch pipe;

and providing a screw rod, and connecting the screw rod drawknot between the two opposite anchor plates so that the two anchor plates are fixedly connected and clamped on the branch pipe.

The construction method of the prestressed FRP reinforcement structure of the T-shaped member is further improved in that the anchor plate is parallel to the main pipe, and the end part of the anchor plate protrudes out of the branch pipe to form a protruding part;

providing a jacking piece, arranging the jacking piece between the protruding part and the main pipe, extending the jacking piece to push against the protruding part and the main pipe, so that the anchor plate moves along the branch pipe to the direction far away from the main pipe, thereby stretching the cloth belt, and further fixedly connecting the screw rod and the anchor plate, so that the anchor plate is clamped on the branch pipe.

Drawings

Fig. 1 is a side view of a prestressed FRP reinforcement structure of a T-shaped member of the present invention.

Fig. 2 is a front view of the prestressed FRP reinforcement structure of the T-shaped member of the present invention.

Fig. 3 is a side view of the prestressed FRP reinforcing structure of the T-shaped member according to the present invention when prestressing is applied to the tapes.

Fig. 4 is a front view of the prestressed FRP reinforcing structure of the T-shaped member of the present invention when prestressing is applied to the cloth tapes.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1, the invention provides a prestressed FRP reinforcement structure of a T-shaped member and a construction method thereof, wherein one end of a cloth belt is fixed on a branch pipe, and the other end of the cloth belt bypasses a main pipe and is fixed on a side part corresponding to the branch pipe, so that the cloth belt is used for hanging the main pipe, thereby reinforcing the connection part of the main pipe and the branch pipe, and in addition, an anchor plate is used for clamping and fixing the cloth belt and the branch pipe, thereby preventing the cloth belt from falling off from the branch pipe, solving the problem that the welding seam of the T-shaped member is easy to generate fatigue damage, reinforcing the connection of the T-shaped member through the FRP cloth belt, enhancing the strength of the weak point of the T-shaped member, avoiding generating new welding seams and welding defects, ensuring the construction quality and enhancing the structural strength. The prestressed FRP reinforced structure of the T-shaped member according to the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a side view of a prestressed FRP reinforcement structure of a T-shaped member according to the present invention. The prestressed FRP reinforced structure of the T-shaped member of the present invention will be described with reference to fig. 1.

As shown in fig. 1 and 2, the prestressed FRP reinforcement structure of a T-shaped member of the present invention, which includes a branch pipe 22 and a main pipe 21 vertically connected to an end of the branch pipe 22, includes:

a cloth tape 11 having one end fixed to a side portion of the branch pipe 22, the other end of the cloth tape 11 passing around the main pipe 21 and being fixed to a corresponding side portion of the branch pipe 22, so that the cloth tape 11 is U-shaped and hangs the main pipe 21, the cloth tape 11 being made of FRP material;

the anchor plate 12 is fixed at the end part of the cloth belt 11 and is attached to the side part corresponding to the branch pipe 22, and the end part of the cloth belt 11 is clamped between the anchor plate 12 and the branch pipe 22; and

the threaded rods 13 connected to the opposite anchor plates 12 are pulled in opposite directions so that the anchor plates 12 are fixedly connected and clamped to the branch pipe 22.

Preferably, the cloth tape 11 is made of CFRP material.

Specifically, the cloth tape comprises a filling layer 15 which is filled in a gap formed between the cloth tape 11 and the branch pipe 22.

Preferably, the filling layer 15 is filled with epoxy mortar or structural adhesive.

As a preferred embodiment of the present invention, as shown in fig. 3 and 4, the anchor plate 12 is parallel to the main pipe 21, and the end of the anchor plate 12 protrudes out of the branch pipe 22 to form a protrusion, and the screw 13 is connected between the protrusions of the two opposite anchor plates 12;

the jacking member 31 is arranged between the protruding part and the main pipe 21, and the jacking member 31 is extended to push against the protruding part and the main pipe 21, so that the anchor plate 12 moves along the branch pipe 22 in the direction away from the main pipe 21, thereby tensioning the cloth tape 11 and applying prestress to the cloth tape 11, and further fixedly connecting the screw 13 and the protruding part, so that the anchor plate 12 is clamped on the branch pipe 22.

Specifically, a nut 131 is screwed to the end of the screw 13, and the position of the anchor plate 12 is fixed by screwing the nut 131 so that the nut 131 abuts against the corresponding anchor plate 12.

Preferably, the clamp also comprises a bead 14 fixed to the side of the anchor plate 12 remote from the branch pipe 22, and the nut 131 abuts against the side of the bead 14 remote from the branch pipe 22.

Preferably, the length of the bead 14 matches the length of the anchor plate 12.

Specifically, the batten 14 and the anchor plate 12, the anchor plate 12 and the cloth belt 11, and the cloth belt 11 and the branch pipe 22 are fixedly connected through structural adhesive.

The specific implementation method of the invention is as follows:

fixing anchor plates 12 at two ends of a cloth belt 11, winding the end parts of the cloth belt 11 on the anchor plates 12, treating the surfaces of the branch pipes 22 and the main pipe 21, removing paint at positions of the branch pipes 22 and the main pipe 21 to be in contact with the cloth belt 11, performing rough treatment, and removing dirt on the surfaces by acetone or alcohol;

adhering the anchor plate 12 at one end of the cloth belt 11 to the side surface of the branch pipe 22 by using structural adhesive, and adhering the corresponding anchor plate 12 to the corresponding side part of the branch pipe 22 by using the structural adhesive by bypassing the other end of the cloth belt 11 around the main pipe 21, wherein the structural adhesive is not coagulated;

fixing the pressing strips 14 at the side parts of the anchor plates 12 far away from the branch pipe 22, and penetrating the screw rods 13 between the protruding parts of the two opposite anchor plates 12, wherein the nuts 131 do not abut against the corresponding pressing strips 14, namely the anchor plates 12 are not clamped on the branch pipe 22;

placing a jacking piece 31 between the main pipe 21 and the protruding part of the anchor plate 12, placing a backing plate 32 at the bottom and the top of the jacking piece 31, extending the jacking piece 31 to enable the jacking piece 31 to abut against the anchor plate 12 and the main pipe 21, enabling the anchor plate 12 to move along the branch pipe 22 in a direction away from the main pipe 21, thereby tensioning the cloth belt 11, applying prestress to the cloth belt 11 and keeping the length of the jacking piece 31;

screwing the nut 131 to enable the nut 131 to abut against the corresponding pressing strip 14, so as to fixedly connect the two anchor plates 12, enable the two anchor plates 12 to be clamped on the branch pipe 22, shorten the jacking piece 31 after the structural adhesive is solidified and reaches the designed strength, and take out the jacking piece 31 and the backing plate 32;

epoxy plaster or structural adhesive is filled in the gaps between the cloth tapes 11 and the branch pipes 22 to form the filling layers 15 so as to provide protection for the cloth tapes 11, the cloth tapes 11 hang the main pipe 21, and the reinforced structure is connected with the T-shaped member without welding seams, so that new welding defects and fatigue weak points are not introduced, and the strength of the T-shaped member is strengthened.

The invention also provides a construction method of the prestress FRP reinforcing structure of the T-shaped component, which comprises the following steps:

providing an anchor plate 12 and a cloth belt 11, and fixing the anchor plate 12 at the end part of the cloth belt 11;

attaching one end of a cloth tape 11 to the side part of the branch pipe 22, and attaching the other end of the cloth tape 11 to the corresponding side part of the branch pipe 22 by passing the main pipe 21 around the cloth tape 11, so that the cloth tape 11 is U-shaped and hangs the main pipe 21, and the cloth tape 11 is clamped between the anchor plate 12 and the branch pipe 22;

a screw 13 is provided and the screw 13 is drawably connected between the two opposite anchor plates 12 so that the two anchor plates 12 are fixedly connected and clamped to the branch pipe 22.

Further, the anchor plate 12 is parallel to the main pipe 21, and the end of the anchor plate 12 protrudes out of the branch pipe 22 to form a protrusion;

providing a jacking member 31, placing the jacking member 31 between the protruding part and the main pipe 21, extending the jacking member 31 to abut against the protruding part and the main pipe 21, so that the anchor plate 12 moves along the branch pipe 22 in a direction away from the main pipe 21, thereby tensioning the cloth belts 11, and further fixedly connecting the screw rods 13 and the anchor plate 12, so that the anchor plate 12 is clamped on the branch pipe 22.

The operation mode of the practical implementation of the construction method provided by the invention is as follows:

fixing anchor plates 12 at two ends of a cloth belt 11, winding the end parts of the cloth belt 11 on the anchor plates 12, treating the surfaces of the branch pipes 22 and the main pipe 21, removing paint at positions of the branch pipes 22 and the main pipe 21 to be in contact with the cloth belt 11, performing rough treatment, and removing dirt on the surfaces by acetone or alcohol;

adhering the anchor plate 12 at one end of the cloth belt 11 to the side surface of the branch pipe 22 by using structural adhesive, and adhering the corresponding anchor plate 12 to the corresponding side part of the branch pipe 22 by using the structural adhesive by bypassing the other end of the cloth belt 11 around the main pipe 21, wherein the structural adhesive is not coagulated;

fixing the pressing strips 14 at the side parts of the anchor plates 12 far away from the branch pipe 22, and penetrating the screw rods 13 between the protruding parts of the two opposite anchor plates 12, wherein the nuts 131 do not abut against the corresponding pressing strips 14, namely the anchor plates 12 are not clamped on the branch pipe 22;

placing a jacking piece 31 between the main pipe 21 and the protruding part of the anchor plate 12, placing a backing plate 32 at the bottom and the top of the jacking piece 31, extending the jacking piece 31 to enable the jacking piece 31 to abut against the anchor plate 12 and the main pipe 21, enabling the anchor plate 12 to move along the branch pipe 22 in a direction away from the main pipe 21, thereby tensioning the cloth belt 11, applying prestress to the cloth belt 11 and keeping the length of the jacking piece 31;

screwing the nut 131 to enable the nut 131 to abut against the corresponding pressing strip 14, so as to fixedly connect the two anchor plates 12, enable the two anchor plates 12 to be clamped on the branch pipe 22, shorten the jacking piece 31 after the structural adhesive is solidified and reaches the designed strength, and take out the jacking piece 31 and the backing plate 32;

epoxy plaster or structural adhesive is filled in the gaps between the cloth tapes 11 and the branch pipes 22 to form the filling layers 15 so as to provide protection for the cloth tapes 11, the cloth tapes 11 hang the main pipe 21, and the reinforced structure is connected with the T-shaped member without welding seams, so that new welding defects and fatigue weak points are not introduced, and the strength of the T-shaped member is strengthened.

While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.