阅读说明：本技术 一种表面式光纤光栅智能frp锚杆及其制备方法 (Surface type fiber bragg grating intelligent FRP (fiber reinforced plastic) anchor rod and preparation method thereof ) 是由 白石 黄金 席晓卿 欧进萍 于 2019-12-13 设计创作，主要内容包括：本发明公开了一种表面式光纤光栅智能FRP锚杆及其制备方法,包括：FRP锚杆、光纤光栅传感器、粘结剂、热缩套管、端部保护装置、跳线测试头,FRP锚杆表面开有小槽,光纤光栅传感器通过粘结剂粘贴于FRP锚杆表面的小槽内,热缩套管包裹在开槽部位,端部保护装置安装于智能FRP锚杆的端部,跳线测试头从智能FRP锚杆的端部引出,本发明结构简单,具有稳定性好、生产方便且经济性好的特点,可用于岩土工程边坡、水利水电工程大规模地下洞室、隧道等基础设施中的锚杆应力监测。(The invention discloses a surface type fiber grating intelligent FRP anchor rod and a preparation method thereof, wherein the method comprises the following steps: the intelligent fiber bragg grating anchor rod stress monitoring device comprises an FRP anchor rod, a fiber bragg grating sensor, a binder, a heat-shrinkable sleeve, an end part protection device and a jumper wire testing head, wherein a small groove is formed in the surface of the FRP anchor rod, the fiber bragg grating sensor is stuck in the small groove in the surface of the FRP anchor rod through the binder, the heat-shrinkable sleeve is wrapped at the grooved part, the end part protection device is installed at the end part of the intelligent FRP anchor rod, and the jumper wire testing head is led out from the end part of the intelligent FRP anchor rod.)

1. The utility model provides a surperficial formula fiber grating intelligence FRP stock which characterized in that: the fiber bragg grating test device comprises an FRP anchor rod (1), a fiber bragg grating sensor (2), a binder (3), a heat-shrinkable sleeve (4), an end part protection device (5) and a jumper test head (6), wherein a small groove is formed in the surface of the FRP anchor rod (1), the fiber bragg grating sensor (2) is stuck in the small groove in the surface of the FRP anchor rod (1) through the binder (3), the heat-shrinkable sleeve (4) is wrapped at the groove forming part of the FRP anchor rod (1), the end part protection device (5) is installed at the end part of the FRP anchor rod (1), and the jumper test head (6) is connected with the fiber bragg grating sensor (2) and is led out from the end part of the FRP anchor rod (1).

2. A surface type fiber grating intelligent FRP anchor rod as claimed in claim 1, which is characterized in that: the width and the depth of the small groove on the surface of the FRP anchor rod (1) are both 1-1.5 mm.

3. A surface type fiber grating intelligent FRP anchor rod as claimed in claim 1, which is characterized in that: the fiber grating sensor (2) is a single mode fiber written with one or more fiber gratings.

4. A surface type fiber grating intelligent FRP anchor rod as claimed in claim 1 or 3, wherein: the fiber grating sensor (2) is a plurality of single-mode fibers which are arranged in parallel and are written with one or more fiber gratings.

5. The preparation method of the surface type fiber bragg grating intelligent FRP anchor rod as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following steps:

the method comprises the following steps: preparing materials: preparing an FRP anchor rod (1), a fiber bragg grating sensor (2), a bonding agent (3), a heat-shrinkable sleeve (4), an end part protection device (5) and a jumper test head (6) in advance;

step two: grooving: grooving the FRP anchor rod (1) by adopting a special tool and cleaning the groove;

step three: laying sensors and protecting: the fiber grating sensor (2) is arranged in the groove opening by adopting an adhesive (3), and the outside is wrapped by adopting a heat-shrinkable sleeve (4);

step four: manufacturing a test jumper: and a jumper wire testing head (6) is welded at one end of the fiber bragg grating sensor (2), and an end part protection device (5) is installed.

Technical Field

The invention relates to the technical field of reinforcement monitoring materials for geotechnical slope tunnel engineering, in particular to a surface type fiber bragg grating intelligent FRP (fiber reinforced plastic) anchor rod and a preparation method thereof.

Background

Structural reinforcement and safety monitoring are the core development directions of civil engineering. At present, the common FRP anchor rod is widely researched and successfully applied to major infrastructure such as geotechnical engineering high slopes, large-scale underground caverns of hydraulic and hydroelectric engineering, large-scale underground plants, flood discharging tunnels and the like.

The common FRP anchor rod is made of materials such as glass fiber, resin and the like through pultrusion equipment. The ordinary FRP anchor rod is anchored into the rock body through the hole of the weak structural plane of the rock body, and the sliding body is connected with the stable rock stratum together, so that the stress state of the slope rock body is changed, and the integrity and the strength of the unstable rock body of the slope are improved.

In order to combine monitoring with reinforcement, an intelligent fiber bragg grating sensor is embedded in a common FRP anchor rod in an effective mode, so that the intelligent FRP anchor rod can be formed, and the stress of an anchoring structure can be effectively monitored. However, due to the special manufacturing method of the embedded intelligent fiber grating sensor, the manufacturing process is complex, once the embedded intelligent fiber grating sensor is manufactured and tested without signals, the whole intelligent anchor rod is wasted, the manufacturing cost is high, and the economic performance is poor, so that an improved technology is urgently needed to solve the problem in the prior art.

Disclosure of Invention

The invention aims to provide a surface type fiber bragg grating intelligent FRP anchor rod and a preparation method thereof, which have the characteristics of simple structure, good stability, convenience in manufacturing and good economy, and can be used for monitoring the stress of the anchor rod in infrastructures such as geotechnical engineering slopes, large-scale underground caverns and tunnels of hydraulic and hydroelectric engineering and the like so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a surface type fiber grating intelligent FRP anchor rod comprises an FRP anchor rod, a fiber grating sensor, a binder, a heat-shrinkable tube, an end part protection device and a jumper test head, wherein a small groove is formed in the surface of the FRP anchor rod, the fiber grating sensor is stuck in the small groove in the surface of the FRP anchor rod through the binder, the process is simple, the fiber grating sensor and the anchor rod are integrated into a whole and have cooperative deformation performance, the heat-shrinkable tube is wrapped at the grooved part of the FRP anchor rod to protect the grooved part and the fiber grating sensor from being damaged, the end part protection device is installed at the end part of the FRP anchor rod to ensure the stability and safety of an outgoing line of the FRP anchor rod, and the jumper test head is connected with the fiber grating sensor and is led out from the end part of the FRP.

Preferably, the width and the depth of the small groove on the surface of the FRP anchor rod are 1-1.5 mm, and the bare fiber grating sensor and the bonding agent can be placed in the small groove without influencing the mechanical property of the member.

Preferably, the fiber grating sensor is a single-mode fiber written with one or more fiber gratings, has a simple structure, and meets different engineering monitoring requirements.

Preferably, the fiber grating sensor is a plurality of single-mode fibers which are arranged in parallel and written with one or more fiber gratings, the structure is simple, and different engineering monitoring requirements are met.

Preferably, the method comprises the following steps:

the method comprises the following steps: preparing materials: preparing an FRP anchor rod, an optical fiber grating sensor, a binder, a heat-shrinkable sleeve, an end part protection device and a jumper test head in advance;

step two: grooving: grooving the FRP anchor rod by adopting a special tool and cleaning the groove;

step three: laying sensors and protecting: arranging the fiber grating sensor in the groove by using an adhesive, and wrapping the fiber grating sensor outside by using a heat-shrinkable sleeve;

step four: manufacturing a test jumper: and a jumper wire testing head is welded at one end of the fiber grating sensor, and an end part protection device is installed.

The manufacturing process is simple, the stability is good, the production is convenient and the economical efficiency is good.

Compared with the prior art, the invention has the beneficial effects that:

(1) the anchor rod stress monitoring device has the characteristics of simple structure, good stability, convenience in manufacturing and good economy, and can be used for monitoring the anchor rod stress in infrastructures such as geotechnical engineering slopes, large-scale underground caverns and tunnels of hydraulic and hydroelectric engineering.

(2) The surface of the FRP anchor rod is provided with the small groove, the processing is convenient, the bare fiber grating sensor can be placed in the small groove, the width and the depth of the small groove are 1-1.5 mm, the bare fiber grating sensor and the bonding agent can be placed in the small groove, and the mechanical property of the member is not influenced.

(3) The fiber grating sensor is adhered to the small groove on the surface of the FRP anchor rod through the adhesive, the process is simple, the fiber grating sensor and the anchor rod are integrated, and the fiber grating sensor and the anchor rod have cooperative deformation performance.

(4) The fiber grating sensor is one or more single-mode fibers written with one or more fiber gratings, and can meet different engineering monitoring requirements.

(5) The heat-shrinkable sleeve wraps the slotted position, so that the slotted position and the fiber bragg grating sensor can be protected from being damaged, the end protection device is arranged at the end of the intelligent FRP anchor rod, and the stability and the safety of the outgoing line of the FRP anchor rod are ensured.

(6) The jumper wire test head is led out from the end part of the intelligent FRP anchor rod, so that the test is convenient.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic cross-sectional view of the present invention.

In the figure: the fiber bragg grating (FRP) anchor rod comprises an FRP anchor rod 1, a fiber bragg grating sensor 2, a binder 3, a heat-shrinkable sleeve 4, an end part protection device 5 and a jumper wire test head 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a surface formula fiber grating intelligence FRP stock, including FRP stock 1, fiber grating sensor 2, binder 3, heat shrinkage bush 4, tip protection device 5 and wire jumper test head 6, FRP stock 1 surface is opened there is the slot, fiber grating sensor 2 pastes in the slot on FRP stock 1 surface through binder 3, simple process, make fiber grating sensor and stock become a whole, have deformation performance in coordination, heat shrinkage bush 4 parcel is at FRP stock 1 fluting position, can protect fluting position and fiber grating sensor not destroyed, tip protection device 5 is installed in FRP stock 1's tip, ensure FRP stock stability and security of being qualified for the next round of competitions, wire jumper test head 6 links to each other with fiber grating sensor 2 and draws forth from FRP stock 1's tip, convenient test.

The surface of the FRP anchor rod 1 is provided with the small groove, the processing is convenient, the bare fiber grating sensor 2 can be placed in, the width and the depth of the small groove on the surface of the FRP anchor rod 1 are 1-1.5 mm, the bare fiber grating sensor 2 and the binder 3 can be placed in, the mechanical property of the component is not influenced, the fiber grating sensor 2 is one or more single-mode fibers in which one or more fiber gratings are written, and different engineering monitoring requirements can be met.

A preparation method of a surface type fiber grating intelligent FRP anchor rod is used for preparing the surface type fiber grating intelligent FRP anchor rod and specifically comprises the following steps:

firstly, preparing materials: preparing an FRP anchor rod 1, an optical fiber grating sensor 2, a binder 3, a heat-shrinkable sleeve 4, an end part protection device 5 and a jumper wire test head 6 in advance;

secondly, grooving: grooving the FRP anchor rod 1 by adopting a special tool and cleaning the groove;

thirdly, arranging sensors and protecting: the fiber grating sensor 2 is arranged in the groove by adopting an adhesive 3, and the outside of the fiber grating sensor is wrapped by a heat-shrinkable sleeve 4;

and fourthly, manufacturing a testing jumper, welding a jumper testing head 6 at one end of the fiber bragg grating sensor, and installing an end part protection device 5.

The manufacturing process is simple, the FRP anchor rod 1, the fiber bragg grating sensor 2 and the binder 3 are organically consolidated into a whole, can cooperatively deform, and can be used for monitoring the stress of the anchor rod in infrastructures such as geotechnical engineering slopes, large-scale underground caverns and tunnels of hydraulic and hydroelectric engineering.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.