PHC pile body with optical fiber sensing system and manufacturing method thereof

Abstract

The invention relates to the technical field of PHC pile bodies, in particular to a PHC pile body with an optical fiber sensing system, which comprises a reinforcement cage, a hoop and an end plate are sleeved at two ends of the reinforcement cage, the reinforcement cage forms a sealing protection structure pile body through tensioning, concrete pouring, centrifuging and high-temperature curing, and at least one optical fiber is arranged, and the optical fiber sensing system is arranged in the reinforcement cage. The optical fiber is bound along the length direction of the reinforcement cage, and a plurality of sensors are connected in series on the optical fiber; and the mounting box is provided with a penetrating groove A and a penetrating groove B which are used for inserting the optical fiber. When the pile body is manufactured, the installation box is installed at the notch in the hoop, the optical fiber penetrates into the installation box and then is sealed through the cover plate, it is ensured that the end of the optical fiber cannot be damaged when the pile body is formed, and meanwhile the penetrating connection groove C is formed in the end plate to communicate with the installation box; during construction of the pile body, optical fiber connection is carried out, and the pile body is stored in a mounting box for sealing treatment for use.

Description

Technical Field

[0001] The present invention relates to the technical field of PHC pile bodies, and particularly relates to a PHC pile body with an optical fiber sensing system and a manufacturing method thereof. Background Art

[0002] The PHC pile body, namely the prestressed high-strength concrete pile body, is an efficient pile foundation material manufactured by the pretensioning prestressing process and the centrifugal forming technology, and is widely used in various construction projects.

[0003] As an important part of a building, the PHC pile body plays an important role in ensuring building safety and improving building quality. Therefore, it is very important to monitor the pile foundation during construction and use, which can timely grasp the working state of the pile foundation, discover potential safety hazards and abnormal situations in time, and avoid building safety accidents caused by pile foundation problems.

[0004] At present, the optical fiber sensing system needs to groove the outer wall of the formed pile body along the length direction, bury the installed optical fiber and sensor into the groove, and then fill it with a sealing material. Such methods will damage the integrity of the pile body to varying degrees and affect the overall performance of the pile body. If the optical fiber sensing system is directly embedded in the concrete to make a PHC pile body, there will be a problem of difficult optical fiber connection during pile splicing. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a PHC pile body with an optical fiber sensing system. When manufacturing the pile body, an installation box is installed at the notch on the hoop, the optical fiber is inserted into the installation box and then sealed by a cover plate to ensure that the end of the optical fiber will not be damaged when the pile body is formed. At the same time, a through connection groove C is provided on the end plate to communicate with the installation box, and the optical fiber is connected during pile construction and stored in the installation box for sealing treatment before use.

[0006] To solve the above technical problems, a technical solution adopted by the present invention is: A PHC pile body with an optical fiber sensing system includes a steel reinforcement cage. Sleeve hoops and end plates are sleeved at both ends of the steel reinforcement cage. The steel reinforcement cage forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing. It also includes, An optical fiber, at least one optical fiber is provided, the optical fiber is tied along the length direction of the steel reinforcement cage, and a plurality of sensors are connected in series on the optical fiber; An installation box, the installation box is provided with a through connection groove A and a through connection groove B for inserting the optical fiber, a notch is provided on the sleeve hoop, and the installation box is arranged in the notch; Wherein, a through connection groove C is provided on the end plate, and the through connection groove C is communicated with the through connection groove B to form a closed channel.

[0007] Further, a cover plate matching the notch is fixedly connected above the notch.

[0008] Further, the number of the mounting boxes corresponds to the optical fibers one by one.

[0009] Further, an identifier is provided at the edge of the end plate located in the through slot C.

[0010] Further, the sensors are fiber Bragg grating thermometers and fiber Bragg grating strain sensors.

[0011] A manufacturing method of a PHC pile body with an optical fiber sensing system is as follows: S1. Manufacture a steel reinforcement cage, and connect the sensors in series to the optical fiber according to the design requirements. S2. Bind the optical fiber and the sensors along the length direction of the main steel bars of the steel reinforcement cage, wherein the optical fiber is arranged parallel to the main steel bars of the steel reinforcement cage. S3. Open a through slot C on the end plate, open a notch on the ferrule, manufacture a mounting box, open a through slot A and a through slot B on the mounting box. After completion, connect the ferrule, the mounting box and the end plate. The mounting box is installed in the notch. Sleeve the ferrule and the end plate at both ends of the steel reinforcement cage, and make the through slot C communicate with the through slot B to form a sealed channel.

[0012] S4. Pass the end of the optical fiber through the through slot A into the mounting box, store the end in the mounting box, and perform a sealing treatment with a removable filling material. The cover plate is covered on the notch. S5. The manufactured steel reinforcement cage forms a sealed protection structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing.

[0013] . Further, welding treatments are adopted between the mounting box, the ferrule and the end plate, and the cover plate and the notch are fixed by screws.

[0014] Further, the through slot A, the through slot B, and the through slot C are V-shaped slots.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, a mounting box is fixedly installed on the ferrule to store the end of the optical fiber. When connecting and testing the end of the optical fiber with a detector, the optical fiber only needs to pass out of the mounting box along the through slot B and the through slot C, so that the optical fiber can pass out along the axial direction of the pile body. When connecting two pile bodies, the optical fibers at the ends of the two pile bodies can be fiber-connected and stored in the mounting box for sealing treatment, which can protect the integrity of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram before the concrete pouring of the pipe pile of the present invention.

[0017] Figure 2 It is a schematic diagram of the explosive structure at the end of the steel reinforcement cage. Specific embodiments

[0018] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0019] As Figure 1 , 2 shown, a PHC pile body with an optical fiber sensing system includes a steel reinforcement cage 10. Sleeve hoops 101 and end plates 40 are sleeved at both ends of the steel reinforcement cage 10. The steel reinforcement cage 10 forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing. It also includes an optical fiber 20. At least one optical fiber 20 is provided. The optical fiber 20 is tied along the length direction of the steel reinforcement cage 10, and a plurality of sensors 201 are installed on the optical fiber 20; an installation box 30. A through slot A 301 and a through slot B 302 for inserting the optical fiber 20 are provided on the installation box 30. A notch 1011 is provided on the sleeve hoop 101, and the installation box 30 is arranged in the notch 1011; wherein, a through slot C 401 is provided on the end plate 40, and the through slot C 401 and the through slot B 302 are connected to form a closed channel.

[0020] Specifically, by providing a notch 1011 on the sleeve hoop 101 and arranging the installation box 30 in the notch 1011, the end of the optical fiber 20 can be inserted into the installation box 30 through the through slot A 301 for storage before pouring. The installation box 30 can be sealed with a filling material to prevent concrete from entering the installation box 30 during pouring, thereby better protecting the optical fiber 20 and facilitating subsequent monitoring and connection using the optical fiber 20.

[0021] Furthermore, in order to better protect the installation box 30, a cover plate 1012 matching the notch 1011 is fixedly connected above the notch 1011.

[0022] Furthermore, the number of the installation boxes 30 corresponds to the optical fibers 20 one by one.

[0023] Furthermore, in order to conveniently find the position of the installation box 30 after pouring concrete and also to more easily identify the installation position during the butt joint of the pile body, an identifier is provided at the edge of the through slot C 401 on the end plate 40.

[0024] Furthermore, the sensors 201 are optical fiber grating thermometers and optical fiber grating strain sensors.

[0025] A manufacturing method of PHC piles with an optical fiber sensing system is as follows: S1. Fabricate the steel reinforcement cage 10, and connect the sensors 201 in series along the optical fiber 20 according to the design requirements. S2. Bind the optical fiber 20 and the sensors 201 along the length direction of the main bars of the steel reinforcement cage 10, where the optical fiber 20 is arranged parallel to the main bars of the steel reinforcement cage 10. S3. Open a through slot C401 on the end plate 40, and open a notch 1011 on the sleeve hoop 101. Fabricate the installation box 30, and open a through slot A301 and a through slot B302 on the installation box 30. After completion, connect the sleeve hoop 101, the installation box 30 and the end plate 40. The installation box 30 is installed in the notch 1011. Sleeve the sleeve hoop 101 and the end plate 40 at both ends of the steel reinforcement cage 10, and make the through slot C401 communicate with the through slot B302 to form a sealed channel. For the convenience of fabrication, the through slot A301, the through slot B302 and the through slot C401 are V-shaped slots.

[0026] S4. Pass the end of the optical fiber 20 through the through slot A301 into the installation box 30, and store the end in the installation box 30. Perform a sealing treatment with a removable filling material, and cover the notch 1011 with the cover plate 1012. Welding treatment is adopted between the installation box 30, the sleeve hoop 101 and the end plate 40. The cover plate 1012 and the notch 1011 are fixed by screws. The filling material can be foam glue. S5. The fabricated steel reinforcement cage 10 forms a sealed protection structure pile through tensioning, concrete pouring, centrifugation and high-temperature curing.

[0027] After the pile is completed, a test is carried out. It is necessary to remove the cover plate 1012, clean the filling material and then test the optical fiber 20 to confirm that the sensor 201 works normally. Then, perform a sealing treatment with the filling material. The cover plate 1012 is connected to the sleeve hoop 101 by screws to close the notch 1011.

[0028] During on-site construction, when splicing the piles, remove the cover plate 1012, clean the filling material and then test and connect the optical fiber 20. After the test and connection of the optical fiber 20 are completed, process the optical fiber 20 joints. The redundant optical fiber 20 is stored in the installation box 30, and a sealing treatment is performed with the filling material.

Claims

1. A PHC pile with an optical fiber sensing system, comprising a steel reinforcement cage (10), wherein sleeve collars (101) and end plates (40) are sleeved at both ends of the steel reinforcement cage (10), and the steel reinforcement cage (10) forms a sealed protection structure pile through tensioning, concrete pouring, centrifugation, and high-temperature curing, characterized in that, It further includes an optical fiber (20), at least one optical fiber (20) is provided, the optical fiber (20) is tied along the length direction of the steel reinforcement cage (10), and a plurality of sensors (201) are connected in series on the optical fiber (20); a mounting box (30), the mounting box (30) is provided with a through slot A (301) and a through slot B (302) for the optical fiber (20) to be inserted, a notch (1011) is provided on the ferrule (101), and the mounting box (30) is arranged in the notch (1011); wherein, a through slot C (401) is provided on the end plate (40), and the through slot C (401) is communicated with the through slot B (302) to form a closed channel.

2. The PHC pile body with an optical fiber sensing system according to claim 1, wherein: A cover plate (1012) matching with the notch (1011) is fixedly connected above the notch (1011).

3. The PHC pile body with an optical fiber sensing system according to claim 1, characterized in that: The number of the mounting boxes (30) corresponds to the optical fibers (20) one by one.

4. A PHC pile body with an optical fiber sensing system according to claim 1, characterized in that: The end plate (40) is provided with a mark at the edge of the through slot C (401).

5. The PHC pile body with an optical fiber sensing system according to claim 1, characterized in that, The sensors (201) are optical fiber grating thermometers and optical fiber grating strain sensors.

6. A manufacturing method of PHC piles with an optical fiber sensing system, characterized in that: The specific steps for manufacturing the pile body as described in any one of claims 1 to 5 are as follows S1, manufacturing the steel reinforcement cage (10), connecting the sensors (201) in series to the optical fiber (20) according to the design requirements; S2, tying the optical fiber (20) and the sensors (201) along the length direction of the main steel bars of the steel reinforcement cage (10), wherein the optical fiber (20) is arranged parallel to the main steel bars of the steel reinforcement cage (10); S3, opening a through slot C (401) on the end plate (40), opening a notch (1011) on the ferrule (101), manufacturing the mounting box (30), opening a through slot A (301) and a through slot B (302) on the mounting box (30), after completion, connecting the ferrule (101), the mounting box (30) and the end plate (40), installing the mounting box (30) in the notch (1011), sleeving the ferrule (101) and the end plate (40) at both ends of the steel reinforcement cage (10), and making the through slot C (401) communicate with the through slot B (302) to form a sealed channel; S4, passing the end of the optical fiber (20) through the through slot A (301) into the mounting box (30), storing the end in the mounting box (30), performing a sealing treatment with a removable filling material, and covering the cover plate (1012) on the notch (1011); S5, the manufactured steel reinforcement cage (10) forms a sealed protection structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing.

7. The manufacturing method of a PHC pile body with an optical fiber sensing system according to claim 6, characterized in that: Welding treatment is adopted between the mounting box (30), the ferrule (101), and the end plate (40), and the cover plate (1012) and the notch (1011) are fixed by screws.

8. A manufacturing method of a PHC pile body with an optical fiber sensing system according to claim 7, characterized in that: The through slot A (301), the through slot B (302), and the through slot C (401) adopt V-shaped slots.

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