PHC pile body with optical fiber sensing system

Abstract

The utility model 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, centrifugation and high-temperature curing, and at least one optical fiber is arranged. 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 of 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, meanwhile, the penetrating connection groove C is formed in the end plate to be communicated with the installation box, and therefore the optical fiber is prevented from being damaged. 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] This utility model relates to the field of PHC pile technology, specifically to a PHC pile with an optical fiber sensing system. Background Technology

[0002] PHC piles, or prestressed high-strength concrete piles, are a type of high-efficiency pile foundation material manufactured using prestressing technology and centrifugal molding. They are widely used in various building projects.

[0003] PHC piles are an important component of buildings, playing a vital role in ensuring building safety and improving building quality. Therefore, monitoring pile foundations during construction and use is crucial to understanding their working status in real time, promptly identifying potential safety hazards and anomalies, and preventing building safety accidents caused by pile foundation problems.

[0004] Currently, fiber optic sensing systems require grooves to be cut along the length of the formed pile body, the installed fiber optic cable and sensor to be embedded in the grooves, and then the grooves to be filled with sealing material. This method damages the integrity of the pile body to varying degrees, affecting its overall performance. If the fiber optic sensing system is directly pre-embedded in the concrete to form a PHC pile, difficulties in connecting the fiber optic cable during pile splicing will arise. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model provides a PHC pile body with an optical fiber sensing system. During pile body manufacturing, an installation box is installed at the notch on the sleeve, the optical fiber is inserted into the installation box, and then sealed with a cover plate. This ensures that the fiber end is not damaged during pile body forming. Simultaneously, a through-hole C is provided on the end plate to connect the installation box. During pile body construction, the optical fiber is connected and stored in the installation box for sealing before use. To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] A PHC pile body with an optical fiber sensing system includes a reinforcing cage, with sleeves and end plates fitted at both ends of the reinforcing cage. The reinforcing cage forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugal treatment, and high-temperature curing. It also includes...

[0007] An optical fiber is provided, at least one optical fiber is provided, the optical fiber is tied along the length of the reinforcing cage, and multiple sensors are connected in series on the optical fiber;

[0008] The mounting box is provided with a through-hole A and a through-hole B for inserting the optical fiber, and the sleeve is provided with a notch, and the mounting box is disposed in the notch;

[0009] The end plate is provided with a through groove C, which is connected to the through groove B to form a closed channel.

[0010] Furthermore, a matching cover plate is fixedly connected above the notch.

[0011] Furthermore, the number of mounting boxes corresponds one-to-one with the number of optical fibers.

[0012] Furthermore, the end plate is marked on the edge of the through groove C.

[0013] Furthermore, the sensor is a fiber optic grating thermometer or a fiber optic grating strain sensor.

[0014] Furthermore, the through-hole grooves A, B, and C are V-shaped grooves.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] This invention uses a mounting box fixed to the sleeve to store the fiber optic end. When the fiber optic end is connected to the tester for testing, the fiber optic end only needs to be passed through the mounting box along the through-slots B and C to allow the fiber optic end to pass through along the pile axis. When two piles are connected, the fiber optic ends of the two piles can be connected and stored in the mounting box for sealing, which can protect the integrity of the fiber optic end. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the pipe pile before concrete pouring.

[0018] Figure 2 This is a schematic diagram of the exploded structure at the end of the steel cage. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figure 1 , 2 As shown, a PHC pile body with a fiber optic sensing system includes a reinforcing cage 10, with sleeves 101 and end plates 40 fitted at both ends of the reinforcing cage 10. The reinforcing cage 10 forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugal treatment, and high-temperature curing. It also includes...

[0021] Optical fiber 20, at least one optical fiber 20 is provided, the optical fiber 20 is tied along the length direction of the steel cage 10, and multiple sensors 201 are installed on the optical fiber 20;

[0022] Mounting box 30, which is provided with a through-hole A 301 and a through-hole B 302 for inserting the optical fiber 20, and a notch (1011) is provided on the sleeve (101), and the mounting box (30) is disposed in the notch (1011);

[0023] The end plate 40 is provided with a through groove C401, which is connected to the through groove B302 to form a closed channel.

[0024] Specifically, by setting a notch 1011 in the sleeve 101 and setting an installation box 30 inside the notch 1011, the end of the optical fiber 20 can be inserted into the installation box 30 through the splice groove A 301 before pouring. The installation box 30 can be sealed with 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 of the optical fiber 20.

[0025] Furthermore, in order to better protect the mounting box 30, a matching cover plate 1012 is fixedly connected above the notch 1011.

[0026] Furthermore, the number of mounting boxes 30 corresponds one-to-one with the number of optical fibers 20.

[0027] Furthermore, in order to facilitate finding the location of the installation box 30 after pouring concrete, and also to make it easier to identify the installation position when the piles are connected, the end plate 40 is marked on the edge of the through groove C401.

[0028] Furthermore, the sensor 201 is a fiber optic grating thermometer or a fiber optic grating strain sensor.

[0029] A method for manufacturing a PHC pile with an optical fiber sensing system, the specific steps of which are as follows:

[0030] S1. Fabricate steel cage 10 and connect sensor 201 in series with optical fiber 20 according to design requirements;

[0031] S2, Wire 20 and sensor 201 are tied along the length of the main reinforcement of the steel cage 10, wherein the fiber 20 is arranged parallel to the main reinforcement of the steel cage 10.

[0032] S3, a through-slot C401 is made on the end plate 40, and a notch 1011 is made on the sleeve 101. The mounting box 30 is made with through-slots A301 and B302. After completion, the sleeve 101, the mounting box 30 and the end plate 40 are connected. The mounting box 30 is installed in the notch 1011. The sleeve 101 and the end plate 40 are fitted on both ends of the reinforcing cage 10, so that the through-slots C401 and B302 are connected to form a sealed channel. For ease of manufacturing, the through-slots A301, B302 and C401 are V-shaped grooves.

[0033] S4, pass the end of the optical fiber 20 through the splice slot A301 into the mounting box 30, store the end inside the mounting box 30, and seal it with removable filler material. The cover plate 1012 is placed on the notch 1011. The mounting box 30, the sleeve 101, and the end plate 40 are all welded together. The cover plate 1012 is fixed to the notch 1011 with screws. Foam adhesive can be used as the filler material.

[0034] S5, after the steel cage 10 is completed, it forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing.

[0035] After the pile body is completed, testing is required. The cover plate 1012 needs to be removed, the filling material cleaned, and the fiber optic cable 20 tested to confirm that the sensor 201 is working properly. Then, the filling material is used for sealing. The cover plate 1012 is connected to the sleeve 101 by screws to close the notch 1011.

[0036] During on-site construction, when splicing the piles, the cover plate 1012 is removed, the filling material is cleaned, and the fiber optic cable 20 is tested and connected. After the testing and connection of the fiber optic cable 20 is completed, the fiber optic cable 20 connector is processed, and the excess fiber optic cable 20 is stored in the installation box 30 and sealed with filling material.

Claims

1. A PHC pile body with an optical fiber sensing system, comprising a reinforcing cage (10), wherein the two ends of the reinforcing cage (10) are fitted with hoops (101) and end plates (40), and the reinforcing cage (10) forms a sealed protective structure pile body through tensioning, concrete pouring, centrifugation, and high-temperature curing, characterized in that, It also includes, An optical fiber (20) is provided, at least one optical fiber (20) is provided, the optical fiber (20) is tied along the length direction of the steel cage (10), and multiple sensors (201) are connected in series on the optical fiber (20). Mounting box (30), the mounting box (30) is provided with a through groove A (301) and a through groove B (302) for inserting the optical fiber (20), the sleeve (101) is provided with a notch (1011), and the mounting box (30) is disposed in the notch (1011); The end plate (40) is provided with a through groove C (401), and the through groove C (401) and the through groove B (302) are connected to form a closed channel.

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

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

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

5. A PHC pile body with an optical fiber sensing system according to claim 1, characterized in that, The sensor (201) is a fiber optic grating thermometer and a fiber optic grating strain sensor.

6. A PHC pile body with an optical fiber sensing system according to claim 1, characterized in that, The through-hole grooves A (301), B (302), and C (401) are V-shaped grooves.

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