阅读说明：本技术 预制砼结构光纤传感监测网布设装备和方法 (Prefabricated concrete structure optical fiber sensing monitoring net laying equipment and method ) 是由 董长松 李震 富志鹏 赵力国 刘智 李博融 于 2021-06-04 设计创作，主要内容包括：本发明涉及预制砼结构光纤传感监测网布设装备和方法,以锰钢加密弹簧软轴作为穿线导索,在预制砼结构构件预留的结构预留穿线孔内进行应变温补联合监测光纤的牵引布设；锰钢加密弹簧软轴由大型疏通机从预制砼结构构件的结构预留穿线孔的起始孔口泵送至终止孔口；锰钢加密弹簧软轴的末端与光纤连接,始端与收盘器连接,通过收盘器卷收锰钢加密弹簧软轴,从而将光纤牵引至结构预留穿线孔中。本发明利用弹簧软轴作为穿线导索实现预制砼结构大范围、长距离传感光纤布设,可以解决光纤分步布设存在的光纤易折断、光纤熔接断点多等问题,形成预制砼结构光纤监测网,实现结构安全状态的广域、实时监测。(The invention relates to a prefabricated concrete structure optical fiber sensing monitoring net layout device and a method, wherein a manganese steel encrypted spring flexible shaft is used as a threading guide cable, and strain temperature compensation combined monitoring optical fiber traction layout is carried out in a structure reserved threading hole reserved in a prefabricated concrete structure member; the manganese steel encrypted spring flexible shaft is pumped from a starting orifice of a structure reserved threading hole of the prefabricated concrete structural member to a terminating orifice by a large dredging machine; the tail end of the manganese steel encryption spring flexible shaft is connected with the optical fiber, the starting end of the manganese steel encryption spring flexible shaft is connected with the disc collecting device, and the manganese steel encryption spring flexible shaft is rolled up by the disc collecting device, so that the optical fiber is pulled into the structure reserved threading hole. The invention realizes the large-range and long-distance arrangement of the sensing optical fibers of the precast concrete structure by using the spring flexible shaft as the threading guide cable, can solve the problems of easy breakage of the optical fibers, more welding breakpoints of the optical fibers and the like in the step-by-step arrangement of the optical fibers, forms the optical fiber monitoring network of the precast concrete structure and realizes the wide-range and real-time monitoring of the structure safety state.)

1. Prefabricated concrete structure optical fiber sensing monitoring net lays and equips its characterized in that:

the equipment comprises a manganese steel encrypted spring flexible shaft (5), a large-scale dredging machine (8) and a motor spring flexible shaft disc collecting device (11);

the manganese steel encrypted spring flexible shaft (5) is pumped from a starting orifice of a structure reserved threading hole of the precast concrete structural member (1) to a terminating orifice by a large-scale dredging machine (8);

the tail end of the manganese steel encrypted spring flexible shaft (5) is connected with the strain temperature compensation combined monitoring optical fiber (9), the starting end of the manganese steel encrypted spring flexible shaft is connected with the motor spring flexible shaft coiling device (11), and the manganese steel encrypted spring flexible shaft (5) is coiled by the motor spring flexible shaft coiling device (11), so that the strain temperature compensation combined monitoring optical fiber (9) is pulled to a structure reserved threading hole.

2. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 1, wherein:

in the pumping process, a threading punch head (23) is arranged at the initial end of the manganese steel encrypted spring flexible shaft (5).

3. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 2, wherein:

after pumping is finished, the tail end of the manganese steel encrypted spring flexible shaft (5) is connected with the strain temperature compensation combined monitoring optical fiber (9) through the spring flexible shaft and an optical fiber connecting end (10), and the starting end of the manganese steel encrypted spring flexible shaft (5) is connected with a motor spring flexible shaft coiling device (11) through a spring flexible shaft front end (6).

4. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 3, wherein:

when the length of the manganese steel encrypted spring flexible shaft (5) is not enough, the manganese steel encrypted spring flexible shaft is lengthened through a spring flexible shaft extension end (7).

5. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 4, wherein:

after strain temperature compensation joint monitoring optical fiber (9) is pulled into a structure reserved threading hole, an initial end is clamped and fastened through an optical fiber anchoring clamp (12), a tail end penetrates into an anchoring end pre-embedded rubber sleeve (17), the optical fiber anchoring clamp (12), a micro jack (14) and an optical fiber anchor (13) in sequence, after the optical fiber is tensioned through the micro jack (14) to reach design tension, the optical fiber anchoring clamp (12) clamps the tail end of the strain temperature compensation joint monitoring optical fiber (9) and fastens, and the micro jack (14) and the optical fiber anchor (13) are removed.

6. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 5, wherein:

the side face of the structure reserved threading hole is provided with a pre-buried PVC grouting hole (19) and a pre-buried PVC inspection hole (20), the pre-buried PVC grouting hole is located at two ends of the precast concrete structural member (1), the pre-buried PVC grouting hole (19) is connected with high-pressure grouting equipment (21), and after grouting, whether grout emits out and is blocked in the pre-buried PVC inspection hole (20) is observed.

7. The prefabricated concrete structure optical fiber sensing monitoring net laying equipment as claimed in claim 6, wherein:

the micro jack (14) is connected into the operation pressure rod (16) through the sealed oil pipe (15), the operation pressure rod (16) enables the micro jack (14) to apply load through the sealed oil pipe (15), and the load numerical value of the micro jack (14) on the operation pressure rod (16) is observed to confirm that the design tension value is reached.

8. The method for laying the optical fiber sensing monitoring network of the precast concrete structure based on the equipment implementation of claim 7 is characterized in that:

the manganese steel encrypted spring flexible shaft (5) is used as a threading guide cable, and the traction arrangement of the strain temperature compensation combined monitoring optical fiber is carried out in a structure reserved threading hole reserved in the prefabricated concrete structural member (1).

9. The method for laying the optical fiber sensing monitoring net of the precast concrete structure according to claim 8, characterized by comprising the following steps of:

the method specifically comprises the following steps:

the method comprises the following steps: pumping a spring flexible shaft:

erecting a large-scale dredging machine (8) at the starting end of the structure after the prefabricated concrete structural members (1) are spliced; a manganese steel encrypted spring flexible shaft (5) penetrates into a pumping channel of a large-scale dredging machine (8), and a front end head (6) of the spring flexible shaft is connected with a threading punch (23) and then penetrates into a starting orifice of a longitudinally reserved threading hole (3) or a transversely reserved threading hole (4) of the structure; starting a large dredging machine (8) to pump a manganese steel encrypted spring flexible shaft (5) to a tail end orifice in the structure splicing direction, and lengthening the manganese steel encrypted spring flexible shaft (5) through a spring flexible shaft splicing end (7) when the length of the manganese steel encrypted spring flexible shaft is insufficient;

step two: coiling the spring flexible shaft to pull the optical fiber:

after the end of the manganese steel encrypted spring flexible shaft (5) penetrates out of the tail end orifice of the threading hole, a threading punch (23) connected with the front end (6) of the spring flexible shaft is taken down, and the front end (6) of the spring flexible shaft is fixedly connected with a motor spring flexible shaft disc collecting device (11); penetrating the strain temperature compensation combined monitoring optical fiber (9) into a rubber cushion layer (25) at the connecting end (10) of the manganese steel encrypted spring flexible shaft (5) and the strain temperature compensation combined monitoring optical fiber (9) to screw a fastening nut (24), starting a motor spring flexible shaft coiling device (11), and slowly pulling the manganese steel encrypted spring flexible shaft (5) to enable the strain temperature compensation combined monitoring optical fiber (9) to penetrate out of an orifice at the tail end of a threading hole;

step three: tensioning the optical fiber:

the initial end of the strain temperature compensation combined monitoring optical fiber (9) sequentially penetrates into an anchoring end pre-buried rubber sleeve (17) and an optical fiber anchoring clamp (12), the anchoring end pre-buried rubber sleeve (17) and the optical fiber anchoring clamp (12) are tightly sleeved and penetrated into a threading hole initial orifice, the optical fiber anchoring clamp (12) is clamped at the threading hole initial orifice, and a screw of the optical fiber anchoring clamp (12) is screwed to clamp and fix the initial end of the strain temperature compensation combined monitoring optical fiber (9); sequentially penetrating an embedded rubber sleeve (17) of an anchoring end, an optical fiber anchoring clamp (12), a micro jack (14) and an optical fiber anchor (13) into the tail end of the strain temperature compensation combined monitoring optical fiber (9), clamping the optical fiber anchoring clamp (12) in an orifice at the tail end of a threading hole, tightening a screw of the optical fiber anchor (13) to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber (9), applying a pre-tensioning force to the micro jack (14) through a pressure rod (16) through a sealed oil pipe (15), observing a load numerical value of the micro jack on the pressure rod (16) of a valve gauge, tightening the optical fiber anchoring clamp (12) to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber (9) after the pre-tensioning force reaches a design value and the design tension is stabilized for 5 min;

step four: high-pressure grouting and hole sealing:

grouting and plugging are carried out immediately after the strain temperature compensation combined monitoring optical fiber (9) is tensioned, a grouting nozzle of high-pressure grouting equipment (21) is connected into a pre-buried PVC grouting hole (19) to start slow and uniform grouting, the grouting is not interrupted midway, thick slurry is discharged from a pre-buried PVC inspection hole (20) at the other end of the structure, the inspection hole is sealed, the grouting compactness inspection of the residual segment structure is circularly completed until the initial segment of the structure is reached, and the grouting hole is sealed after proper pressurization is continued; and when the slurry reaches 75% of the designed strength, removing the optical fiber anchoring clamp at the initial end of the initial optical fiber.

Technical Field

The invention relates to the technical field of safety monitoring of prefabricated assembled structures, in particular to prefabricated concrete structure optical fiber sensing monitoring net laying equipment and a method.

Background

Large-scale prefabricated structure equipment of assembling, because receive the effect of external force at long-term service in-process such as shield tunnel, utility tunnel, prefabricated concrete pipe culvert, have structural potential safety hazard, because this type of facility has the characteristics that the disguise is high, the distance is long, distribution area is big, hardly carries out full-time, all-round monitoring to it. The traditional structural engineering monitoring technology and the performance of the sensor are difficult to meet the requirements of wide area, long-term duration and durability, continuous strain and temperature measurement in space can be realized through distributed Brillouin optical fiber sensing, a large-scale monitoring network can be formed, and the method is particularly suitable for safety monitoring of large-scale infrastructure, large-scale structural equipment and the like. However, the main problems faced by laying optical fibers in a prefabricated structure are that a large number of welding breakpoints and optical loss exist in the process of splicing the pre-buried optical fibers in the structure to a site and then welding the pre-buried optical fibers, or the problems that the optical fibers are poor in structural deformation coupling, poor in durability and the like exist in laying methods such as surface sticking and slotting after segment splicing, and the problems that the main structure does not allow slotting to be damaged or the optical fibers are easy to damage when auxiliary facilities are erected in the later period exist. Aiming at the application problems, the optical fiber monitoring net is laid by reserving threading holes in the prefabricated section concrete structure and performing optical fiber perforation fixing after the structure is assembled, so that the optical fiber monitoring net has the advantages of less welding breakpoints and less optical loss, the optical fiber and the structure can be fused by grouting fixing, and the coupling property and the durability are ensured. Finally, by laying the multi-channel optical fibers, the large-range and long-distance monitoring of the structure can be realized, namely, the distributed optical fibers are used for intensive single-point strain measurement (the minimum spatial resolution can reach 2cm at most, and the sampling resolution is 1 cm), and the whole safety state of the structure can be effectively mastered within a reasonable cost control range.

At present, the measurement of the structural stress and strain state by adopting a single-point steel bar meter and a single-point grating optical fiber is a traditional conventional monitoring means, more engineering examples are provided for structural monitoring through a distributed optical fiber, monitoring and research of a prefabricated assembled structure are mostly focused on a surface grooving or sticking mode, and the sensor integration and wide-area monitoring technology for the prefabricated assembled structure is still in an exploration stage.

Disclosure of Invention

The invention aims to provide a prefabricated concrete structure optical fiber sensing monitoring network arrangement device and a method, a wide-area, automatic and low-cost prefabricated structure strain monitoring scheme based on distributed optical fibers is formed, and data support can be provided for stability and safety evaluation of structural engineering.

The technical scheme adopted by the invention is as follows:

prefabricated concrete structure optical fiber sensing monitoring net lays and equips its characterized in that:

the equipment comprises a manganese steel encrypted spring flexible shaft, a large-scale dredger and a motor spring flexible shaft disc collecting device;

the manganese steel encrypted spring flexible shaft is pumped from a starting orifice of a structure reserved threading hole of the prefabricated concrete structural member to a terminating orifice by a large dredging machine;

the tail end of the manganese steel encrypted spring flexible shaft is connected with the strain temperature compensation combined monitoring optical fiber, the starting end of the manganese steel encrypted spring flexible shaft is connected with the motor spring flexible shaft coiler, and the manganese steel encrypted spring flexible shaft is coiled by the motor spring flexible shaft coiler, so that the strain temperature compensation combined monitoring optical fiber is pulled to a structure reserved threading hole.

In the pumping process, a threading punch is arranged at the starting end of the manganese steel encrypted spring flexible shaft.

After the pumping is finished, the tail end of the manganese steel encryption spring flexible shaft is connected with the strain temperature compensation joint monitoring optical fiber through the spring flexible shaft and an optical fiber connecting end, and the starting end of the manganese steel encryption spring flexible shaft is connected with a motor spring flexible shaft coiler through the spring flexible shaft front end.

When the length of the manganese steel encryption spring flexible shaft is insufficient, the manganese steel encryption spring flexible shaft is lengthened through the spring flexible shaft extension end.

After the strain temperature compensation combined monitoring optical fiber is drawn into a structure reserved threading hole, the initial end is clamped and fastened through an optical fiber anchoring clamp, the tail end sequentially penetrates through an anchoring end pre-embedded rubber sleeve, the optical fiber anchoring clamp, a micro jack and an optical fiber anchor, after the optical fiber is tensioned through the micro jack and reaches the design tension, the optical fiber anchoring clamp clamps the tail end of the strain temperature compensation combined monitoring optical fiber and fastens the strain temperature compensation combined monitoring optical fiber, and the micro jack and the optical fiber anchor are removed.

The side face of the structure reserved threading hole is provided with a pre-buried PVC grouting hole and a pre-buried PVC inspection hole which are located at two ends of the prefabricated concrete structural member, the pre-buried PVC grouting hole is connected with high-pressure grouting equipment, and after grouting, whether grout overflows and is blocked in the pre-buried PVC inspection hole is observed.

The miniature jack is connected into the operation pressure rod through the sealing oil pipe, the operation pressure rod enables the miniature jack to apply load through the sealing oil pipe, and the load numerical value of the miniature jack on the operation pressure rod is observed to confirm that the design tension value is reached.

The prefabricated concrete structure optical fiber sensing monitoring network layout method implemented based on the equipment is characterized in that:

and taking the manganese steel encrypted spring flexible shaft as a threading guide cable, and carrying out traction arrangement of the strain temperature compensation combined monitoring optical fiber in a structure reserved threading hole reserved in the prefabricated concrete structural member.

The method specifically comprises the following steps:

the method comprises the following steps: pumping a spring flexible shaft:

erecting a large dredging machine at the starting end of the structure after splicing the prefabricated concrete structural members; the manganese steel encrypted spring flexible shaft penetrates into a pumping channel of the large-scale dredging machine, and the front end of the spring flexible shaft is connected with a threading punch and then penetrates into a structure longitudinally reserved threading hole or a structure transversely reserved threading hole starting orifice; starting the large dredging machine to pump the manganese steel encrypted spring flexible shaft to the end orifice in the structure splicing direction, and lengthening the manganese steel encrypted spring flexible shaft through the spring flexible shaft splicing end when the length of the manganese steel encrypted spring flexible shaft is insufficient;

step two: coiling the spring flexible shaft to pull the optical fiber:

after the end head of the manganese steel encrypted spring flexible shaft penetrates out of the tail end orifice of the threading hole, a threading punch connected with the front end head of the spring flexible shaft is taken down, and the front end head of the spring flexible shaft is fixedly connected with a motor spring flexible shaft coiler; penetrating the strain temperature compensation combined monitoring optical fiber into a rubber cushion layer at the connecting end of the manganese steel encrypted spring flexible shaft and the strain temperature compensation combined monitoring optical fiber to tighten a fastening nut, starting a motor spring flexible shaft coiling device, and slowly pulling the manganese steel encrypted spring flexible shaft to enable the strain temperature compensation combined monitoring optical fiber to penetrate out of an orifice at the tail end of a threading hole;

step three: tensioning the optical fiber:

the strain temperature compensation combined monitoring optical fiber starting end sequentially penetrates into an anchoring end pre-buried rubber sleeve and an optical fiber anchoring clamp, the anchoring end pre-buried rubber sleeve and the optical fiber anchoring clamp are tightly sleeved and penetrate into a threading hole starting orifice, the optical fiber anchoring clamp is clamped in the threading hole starting orifice, and a screw of the optical fiber anchoring clamp is screwed to clamp and fix the strain temperature compensation combined monitoring optical fiber starting end; sequentially penetrating the tail end of the strain temperature compensation combined monitoring optical fiber into an anchoring end pre-buried rubber sleeve, an optical fiber anchoring clamp, a micro-jack and an optical fiber anchor, clamping the optical fiber anchoring clamp in an orifice at the tail end of a threading hole, tightening a screw of the optical fiber anchor to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber, applying a pre-tensioning force to the micro-jack through a compression bar and a sealed oil pipe, observing the load numerical value of the micro-jack on the compression bar of the valve gauge, tightening the optical fiber anchoring clamp to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber after the pre-tensioning force reaches a designed value and stabilizing the design tension for 5 min;

step four: high-pressure grouting and hole sealing:

grouting and plugging are carried out immediately after strain temperature compensation combined monitoring optical fiber tensioning is finished, a grouting nozzle of high-pressure grouting equipment is connected into a pre-buried PVC grouting hole to start slow and uniform grouting, the grouting is not interrupted midway, thick slurry is discharged from the pre-buried PVC inspection hole at the other end of the structure, the inspection hole is sealed, the grouting compactness inspection of the residual segment structure is circularly finished until the initial segment of the structure, proper pressurization is continued, and then the grouting hole is sealed; and when the slurry reaches 75% of the designed strength, removing the optical fiber anchoring clamp at the initial end of the initial optical fiber.

The invention has the following advantages:

(1) the invention can quickly, simply and conveniently lay the optical fiber monitoring net of the prefabricated assembly structure, thereby effectively monitoring the strain state of the large-range and long-distance prefabricated concrete structure.

(2) The invention takes the spring flexible shaft as the traction guide cable to pass through the optical fiber, can realize one-time and integrated whole laying of the optical fiber, and avoids excessive melting points when the optical fiber is laid across the splicing seam.

(3) According to the invention, the special anchoring fixture is used for applying pretension to the optical fiber and then grouting and bonding the optical fiber with the structure, so that the optical fiber and the structure are coupled and a certain sensitization effect is achieved on the optical fiber measurement.

(4) The optical fiber arrangement method provided by the invention can improve the survival rate of the strain temperature compensation combined monitoring optical fiber under a severe construction environment, and can improve the durability of the temperature compensation combined monitoring optical fiber corresponding to the temperature compensation combined monitoring optical fiber grouting packaging protection.

(5) The optical fiber laying method and system provided by the invention enrich the optical fiber laying process and method of the prefabricated concrete structure.

(6) All the systems of the invention are convenient to install, simple to operate, small in equipment volume, easy to carry out work on engineering sites and can be mastered in a short time.

Drawings

FIG. 1 is a schematic diagram of the operation of a spring flexible shaft dredging system;

FIG. 2 is a schematic diagram of the operation of the linkage tandem traction system;

FIG. 3 is a schematic view of the micro fiber anchor system;

FIG. 4 is a schematic view of a spring flexible shaft splicing end;

FIG. 5 is a schematic view showing the connection between the leading end of the spring flexible shaft and the threading punch;

FIG. 6 is a schematic view of a connection end of a spring flexible shaft and an optical fiber;

FIG. 7 is a cross-sectional view of the fiber anchoring clamp;

FIG. 8 is a longitudinal cross-sectional view of the fiber anchor clamp;

FIG. 9 is a cross-sectional view of a fiber optic anchor;

FIG. 10 is a longitudinal cross-sectional view of the fiber anchor;

in the drawing, 1-precast concrete structural member, 2-structural splicing seam, 3-structural longitudinal reserved threading hole, 4-structural transverse reserved threading hole, 5-manganese steel encrypted spring flexible shaft, 6-spring flexible shaft preposed end, 7-spring flexible shaft splicing end, 8-large dredging machine, 9-strain temperature compensation combined monitoring optical fiber, 10-spring flexible shaft and optical fiber connecting end, 11-motor spring flexible shaft coiling device, 12-optical fiber anchoring clamp, 13-optical fiber anchoring device, 14-micro jack, 15-sealing oil pipe, 16-pressure rod, 17-anchoring end embedded rubber sleeve, 18-precast anchoring groove, 19-embedded PVC grouting hole, 20-embedded PVC inspection hole, 21-high-pressure grouting equipment, 22-standard joint, 23-penetrating punch, 24-fastening nut and 25-rubber cushion layer are arranged.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

The invention relates to a prefabricated concrete structure optical fiber sensing monitoring net arrangement device, which comprises a manganese steel encrypted spring flexible shaft 5, a large-scale dredging machine 8 and a motor spring flexible shaft disc collecting device 11; the manganese steel encrypted spring flexible shaft 5 is pumped from a starting orifice of a structure reserved threading hole of the precast concrete structural member 1 to a stopping orifice by a large dredging machine 8; the tail end of the manganese steel encrypted spring flexible shaft 5 is connected with the strain temperature compensation combined monitoring optical fiber 9, the starting end of the manganese steel encrypted spring flexible shaft is connected with the motor spring flexible shaft coiling device 11, and the manganese steel encrypted spring flexible shaft 5 is coiled by the motor spring flexible shaft coiling device 11, so that the strain temperature compensation combined monitoring optical fiber 9 is pulled to a structure reserved threading hole.

In the pumping process, a threading punch 23 is arranged at the starting end of the manganese steel encrypted spring flexible shaft 5 and is connected through a standard joint 22. After the pumping is finished, the tail end of the manganese steel encrypted spring flexible shaft 5 is connected with the strain temperature compensation joint monitoring optical fiber 9 through the spring flexible shaft and an optical fiber connection end 10 (comprising a standard joint 22, a fastening nut 24 and a rubber cushion layer 25), and the starting end of the manganese steel encrypted spring flexible shaft 5 is connected with the motor spring flexible shaft coiling device 11 through the standard joint 22. When the length of the manganese steel encrypted spring flexible shaft 5 is not enough, the spring flexible shaft extension end 7 (a standard joint 22) is used for extension.

After the strain temperature compensation combined monitoring optical fiber 9 is pulled into a structure reserved threading hole, the initial end is clamped and fastened through the optical fiber anchoring clamp 12, the tail end sequentially penetrates through the anchoring end pre-embedded rubber sleeve 17, the optical fiber anchoring clamp 12, the micro jack 14 and the optical fiber anchoring device 13, after the optical fiber is tensioned through the micro jack 14 to reach the design tension, the optical fiber anchoring clamp 12 clamps and fastens the tail end of the strain temperature compensation combined monitoring optical fiber 9, and the micro jack 14 and the optical fiber anchoring device 13 are removed.

The side face of the structure reserved threading hole is provided with a pre-buried PVC grouting hole 19 and a pre-buried PVC inspection hole 20 which are positioned at two ends of the precast concrete structural member 1, the pre-buried PVC grouting hole 19 is connected with a high-pressure grouting device 21, and after grouting, whether grout overflows and is blocked in the pre-buried PVC inspection hole 20 is observed.

The micro jack 14 is connected to an operation pressure rod 16 through a sealing oil pipe 15, the operation pressure rod 16 enables the micro jack 14 to apply load through the sealing oil pipe 15, and the load numerical value of the micro jack 14 on the operation pressure rod 16 is observed to confirm that the design tension value is reached.

The method for laying the optical fiber sensing monitoring network of the precast concrete structure based on the equipment comprises the steps of taking the manganese steel encrypted spring flexible shaft 5 as a threading guide cable, and carrying out traction laying of strain temperature compensation combined monitoring optical fibers in a structure reserved threading hole reserved in the precast concrete structural member 1. The method specifically comprises the following steps:

the method comprises the following steps: pumping a spring flexible shaft:

erecting a large dredging machine 8 at the starting end of the structure after splicing the prefabricated concrete structural members 1; the manganese steel encrypted spring flexible shaft 5 penetrates into a pumping channel of a large-scale dredging machine 8, and a front end 6 of the spring flexible shaft is connected with a threading punch 23 and then penetrates into a starting orifice of a longitudinally reserved threading hole 3 or a transversely reserved threading hole 4 of the structure; starting the large dredging machine 8 to pump the manganese steel encrypted spring flexible shaft 5 to the end orifice in the structure splicing direction, and lengthening the manganese steel encrypted spring flexible shaft 5 through the spring flexible shaft splicing end 7 when the length of the manganese steel encrypted spring flexible shaft is insufficient;

step two: coiling the spring flexible shaft to pull the optical fiber:

after the end of the manganese steel encrypted spring flexible shaft 5 penetrates out of the tail end orifice of the threading hole, a threading punch 23 connected with the front end 6 of the spring flexible shaft is taken down, and the front end 6 of the spring flexible shaft is fixedly connected with a motor spring flexible shaft disc collecting device 11; the strain temperature compensation joint monitoring optical fiber 9 penetrates through a rubber cushion layer 25 at the connecting end 10 of the manganese steel encrypted spring flexible shaft 5 and the strain temperature compensation joint monitoring optical fiber 9 to be screwed with a fastening nut 24, a motor spring flexible shaft coiling device 11 is started, and the manganese steel encrypted spring flexible shaft 5 is slowly pulled to enable the strain temperature compensation joint monitoring optical fiber 9 to penetrate out of an orifice at the tail end of a threading hole;

step three: tensioning the optical fiber:

the initial end of the strain temperature compensation combined monitoring optical fiber 9 sequentially penetrates into an anchoring end embedded rubber sleeve 17 and an optical fiber anchoring clamp 12, the anchoring end embedded rubber sleeve 17 and the optical fiber anchoring clamp 12 are tightly sleeved and penetrate into a threading hole initial orifice, the optical fiber anchoring clamp 12 is clamped at the threading hole initial orifice, and a screw of the optical fiber anchoring clamp 12 is screwed to clamp and fix the initial end of the strain temperature compensation combined monitoring optical fiber 9; sequentially penetrating an anchoring end pre-embedded rubber sleeve 17, an optical fiber anchoring clamp 12, a micro jack 14 and an optical fiber anchor 13 into the tail end of the strain temperature compensation combined monitoring optical fiber 9, clamping the optical fiber anchoring clamp 12 in an orifice at the tail end of a threading hole, tightening a screw of the optical fiber anchor 13 to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber 9, applying a pre-tensioning force to the micro jack 14 through a compression bar 16 via a sealing oil pipe 15, observing a load numerical value of the micro jack on the compression bar 16 of a valve gauge, tightening the optical fiber anchoring clamp 12 to clamp and fix the tail end of the strain temperature compensation combined monitoring optical fiber 9 after the pre-tensioning force reaches a designed value and the design tension is stabilized for 5 min;

step four: high-pressure grouting and hole sealing:

grouting and plugging are carried out immediately after the strain temperature compensation combined monitoring optical fiber 9 is tensioned, a grouting nozzle of high-pressure grouting equipment 21 is connected into a pre-buried PVC grouting hole 19 to start slow and uniform grouting, the grouting is not interrupted midway, thick slurry is discharged from a pre-buried PVC inspection hole 20 at the other end of the structure, the inspection hole is sealed, the grouting compactness inspection of the residual segment structure is circularly completed until the initial segment of the structure, and the grouting hole is sealed after proper pressurization is continued; and when the slurry reaches 75% of the designed strength, removing the optical fiber anchoring clamp at the initial end of the initial optical fiber.

And continuously and circularly arranging the monitoring optical cable of the next assembling section through the four steps, so that the ultra-long distance assembling structure monitoring optical cable arrangement is realized.

The invention is explained in further detail with reference to the drawings in which:

the invention realizes the layout of the optical fiber monitoring net with the precast concrete structure through a spring flexible shaft dredging system, a linkage series traction system, a micro optical fiber anchor system and a high-pressure grouting system. The method comprises the following steps that (1) a prefabricated concrete structural member 1 is prefabricated in a factory, and according to the structural monitoring requirement, a threading hole 3 and a threading hole 4 (the aperture is 25 mm-30 mm) are reserved in the prefabricated concrete structure in the transverse direction; after the prefabricated concrete structural member 1 is hoisted, spliced and molded on a construction site, a 65 manganese steel encrypted spring flexible shaft 5 penetrates through an initial orifice of a longitudinal reserved threading hole 3 (or a transverse reserved threading hole 4) of the structure, and is pumped to the longitudinal reserved threading hole 3 (or the transverse reserved threading hole 4) of the structure by a 1200-type large-scale dredging machine 8 to stop the orifice to penetrate out; the strain temperature compensation combined monitoring optical fiber 9 is clamped at the tail end of the 65 manganese steel encrypted spring flexible shaft 5 through the spring flexible shaft and an optical fiber connecting end 10, the end of the 65 manganese steel encrypted spring flexible shaft 5 is connected with a motor spring flexible shaft coiling device 11, and the 65 manganese steel encrypted spring flexible shaft 5 is slowly coiled through a stepping motor until the strain temperature compensation combined monitoring optical fiber 9 penetrates out of a stop orifice of a structure longitudinal reserved threading hole 3 (or a structure transverse reserved threading hole 4).

The initial end of the strain temperature compensation combined monitoring optical fiber 9 is clamped and fastened through an optical fiber anchoring clamp 12, the tail end of the strain temperature compensation combined monitoring optical fiber 9 penetrates through an anchoring end pre-buried rubber sleeve 17, the optical fiber anchoring clamp 12, a micro jack 14 and an optical fiber anchoring device 13 in sequence, the optical fiber anchoring device 13 clamps and fastens the tail end of the strain temperature compensation combined monitoring optical fiber 9, after the optical fiber is tensioned through the micro jack 14 and reaches a design tension, the optical fiber anchoring clamp 12 clamps and fastens the tail end of the strain temperature compensation combined monitoring optical fiber 9, and the micro jack 14 and the optical fiber anchoring device 13 are removed.

And (3) after a grouting nozzle of the high-pressure grouting equipment 21 is in butt joint with a pre-buried 20mm PVC grouting hole 19 arranged near the termination orifice of the longitudinal reserved threading hole 3 (or the transverse reserved threading hole 4) of the structure, performing high-pressure grouting and joint filling on the longitudinal reserved threading hole 3 (or the transverse reserved threading hole 4) of the structure, observing whether grout is emitted from a pre-buried 13mm PVC inspection hole 20 arranged at the other end of the precast concrete structural member 1, and plugging the pre-buried 13mm PVC inspection hole 20. And when the slurry reaches 75% of the designed strength, removing the optical fiber anchoring clamp 12 at the initial end and the tail end, and coiling the redundant optical fibers in the prefabricated anchoring groove 18 to facilitate the arrangement of the monitoring optical cable at the next splicing section.

The method is realized by the joint work of the following four systems:

1. the spring flexible shaft dredging system comprises:

the spring flexible shaft dredging system comprises a 65 manganese steel encrypted spring flexible shaft 5, a spring flexible shaft preposed end 6, a spring flexible shaft splicing end 7 and a 1200-type large-scale dredging machine 8. The 65 manganese steel encrypted spring flexible shaft 5 is used as a strain temperature compensation combined monitoring optical fiber threading guide cable, the diameter of the guide cable is 16mm, the guide cable is made by coiling 65 manganese steel with the diameter of 2.5mm, the coiling density is 1mm, the length of a single section is 5 m-10 m, and the customized spring flexible shaft front end 6 and the customized spring flexible shaft continuous end 7 are convenient for the external threading punch 23 and the continuous length of the spring flexible shaft. The 1200-type large dredging machine 8 is used for pumping the 65 manganese steel encrypted spring flexible shaft 5, and has the working power of 4000W, the rotating speed of 700R and the dredging distance of 50-70 m. The one-time traction length of the 65 manganese steel encrypted spring flexible shaft 5 is preferably controlled within 50 m.

2. Linkage series traction system:

the linkage series traction system comprises a spring flexible shaft and optical fiber connection end 10 and a motor spring flexible shaft coiling device 11, wherein the spring flexible shaft and optical fiber connection end 10 consists of a fastening nut 24 and an internal rubber cushion layer 25, one end of the end is clamped with a strain temperature compensation joint monitoring optical fiber 9 starting end, and the other end is connected with the spring flexible shaft. The motor spring flexible shaft coiling device 11 consists of a spring flexible shaft coiling plate and a stepping motor, the control speed of the stepping motor is 1 cm/s-2 cm/s when the spring flexible shaft 5 is coiled 65 manganese steel, and the inner wall of a longitudinally reserved threading hole 3 (or a transversely reserved threading hole 4) of the structure is prevented from being worn and connected with the strain temperature compensation combined monitoring optical fiber 9.

3. Miniature optic fibre anchor system:

the micro optical fiber anchor system comprises an optical fiber anchor clamp 12, an optical fiber anchor 13, a micro jack 14, a sealing oil pipe 15, a pressure rod 16, an anchor end pre-embedded rubber sleeve 17 and a prefabricated anchor groove 18. Performing strain temperature compensation joint monitoring on the tension anchor of the optical fiber in a prefabricated anchor groove 18, designing a customized optical fiber anchor clamp 12, combining two concentric stainless steel circular discs with equal thickness, wherein the diameter of a large disc is 40mm, the diameter of a small disc is 20mm, a rubber gasket with the thickness of 8mm is sleeved outside the small disc, and an optical fiber clamping hole is reserved in the centroid; the optical fiber anchor 13 and the hydraulic cylinder hoop of the micro-jack 14 exert initial pretension on the optical fiber, and the clamping design of the optical fiber at the tail end of the optical fiber anchor 13 is the same as that of the optical fiber anchoring clamp 12. The stroke of a hydraulic cylinder of the micro-jack 14 is 50mm, the load measurement range is 0-10 kN, the load resolution is 0.001kN, and the compression rod 16 is operated to apply load to the micro-jack 14 through the sealing oil pipe 15; the pre-buried rubber sleeve 17 of the anchoring end head is tightly sleeved on the strain temperature compensation joint monitoring optical fiber 9 to protect the same, so that the optical fiber is prevented from being tightly attached to the inner wall of the longitudinal reserved threading hole 3 (or the transverse reserved threading hole 4) when a load is applied.

4. High-pressure slip casting system:

the grouting and plugging of the pore channel can effectively bond the optical fiber and the prefabricated concrete structure, and the grouting is carried out immediately through high-pressure grouting equipment 21 after the optical fiber is pretensioned. The strength of the grouting cement of the ordinary Portland cement with the mark number not less than 425 should meet the design requirements, and should not be less than 20N/mm²The water-cement ratio of the cement paste is controlled to be 0.4-0.45, and the fluidity is controlled to be 120-170 mm. 0.05 to 0.1 percent of aluminum powder or 0.25 percent of calcium lignosulfonate water reducing agent can be added into the mixture.

The working mechanism of the invention is as follows:

the 65 manganese steel encrypted spring flexible shaft is used as a threading guide cable to carry out strain temperature compensation combined monitoring optical fiber layout in a threading hole reserved in a concrete prefabricated structure, namely, a 65 manganese steel encrypted spring flexible shaft is used as a carrier, and a connecting end is additionally arranged at the head end and the tail end of the spring flexible shaft, so that the extension of the spring flexible shaft and the connection of the spring flexible shaft and a strain temperature compensation combined monitoring optical fiber are facilitated, the 65 manganese steel encrypted spring flexible shaft is conveyed from the starting point to the end point of the threading hole opening through a large dredging machine, strain temperature compensation combined monitoring optical fiber is filled in the threading hole, the strain temperature compensation combined monitoring optical fiber is subjected to initial pretension force through the micro tensiometer, the optical fiber is straightened and tightened in the threading hole to increase the sensitivity of optical fiber monitoring, and finally the threading hole is plugged through high-pressure grouting, so that the coupling linkage between the strain temperature compensation combined monitoring optical fiber and a structure to be detected is ensured, the strain temperature compensation combined monitoring optical fiber is protected, and the service durability of the strain temperature compensation combined monitoring optical fiber is improved. Laying optical fibers in a multi-channel threading hole to realize laying of a prefabricated concrete structure optical fiber monitoring sensor network, realizing large-range, long-distance and long-holding structural strain state monitoring based on distributed optical fibers, avoiding the problem that the traditional single-point sensing quantity is sharply increased during large-range monitoring, effectively solving the problems of low optical fiber survival rate, more optical fiber welding breakpoints, easy damage of surface-adhered optical fibers, poor structural deformation coupling and the like when the prefabricated concrete structure is laid with the optical fibers, and being suitable for complex construction environments, convenient and rapid to install and capable of being simply and rapidly mastered.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.