Portable binding and fixing device for distributed optical fiber test

Abstract

The utility model provides a portable binding and fixing device for a distributed optical fiber test, and belongs to the technical field of optical fiber sensing. According to the device, by arranging the base pile casing mold with a round hole formed in the bottom, the connecting pile casing mold and the connecting buckle, optical fibers can be fixed in the pile casing mold, the mold can be disassembled after grouting condensation and hardening, the mold can be recycled, and the obtained pre-embedded optical fiber column can be used for distributed optical fiber monitoring tests. Compared with a method of binding and fixing the optical fiber by adhering the optical fiber to the outer side of a PVC (polyvinyl chloride) pipe, the device can not only effectively protect the integrity of the optical fiber, but also eliminate the discordance of deformation of the PVC pipe and the optical fiber and reduce the situation of data loss, and meanwhile, the use of the PVC pipe is reduced by adopting a recyclable and detachable pile casing mold.

Description

Technical Field

[0001] This utility model belongs to the field of optical fiber sensing technology, specifically a portable binding and fixing device for distributed optical fiber testing. Background Technology

[0002] When using distributed optical fibers to monitor deformation, temperature, and displacement in engineering projects, the usual method involves first drilling holes, then inserting PVC pipes with optical fibers attached to the outside, and finally grouting the gaps in the drilled holes. However, this existing technology suffers from several drawbacks in practice: it consumes PVC pipes, provides poor protection for the optical fibers, and the deformation of the PVC pipes and optical fibers are not synchronized, leading to abnormal monitoring data.

[0003] Therefore, existing fiber optic deployment technologies mostly involve two methods: first, binding the fiber optic cable to the outside of a PVC pipe; and second, sealing the borehole by grouting only, without grouting inside the PVC pipe. The existing technology of attaching the fiber optic cable to the outside of the PVC pipe has two drawbacks. First, the insertion of the PVC pipe into the borehole may cause misalignment or damage to the fiber optic cable, leading to failure. Second, the fiber optic cable is in an environment where one side is the PVC pipe and the other side is the solidified grout, meaning its deformation will be affected by both sides. The elastic modulus of the PVC pipe and the grout are inconsistent, which will lead to inaccurate fiber optic monitoring data. Summary of the Invention

[0004] The technical problem to be solved by this utility model is that the conventional optical fiber deployment structure involves binding the optical fiber to the outside of a PVC pipe without grouting inside the PVC pipe, and only grouting the drilled hole to seal it. As a result, the PVC pipe is consumed, the protection of the optical fiber is poor, and the deformation of the PVC pipe and the deformation of the optical fiber are not coordinated, which leads to abnormal monitoring data.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0006] A portable binding and fixing device for distributed optical fiber testing includes a base sleeve mold and a connecting sleeve mold joined end-to-end along the axial direction. The base sleeve mold includes two radially spliced ​​first half-shells, with a bottom sleeve mold base plate at the bottom end of each first half-shell, a bottom sleeve mold inflation hole on the side wall of each first half-shell, a bottom sleeve mold gasket on the first half-shell at its splicing joint, and a bottom sleeve mold base plate circular hole on the bottom sleeve mold base plate. The connecting sleeve mold includes two radially spliced ​​second half-shells, with a connecting sleeve mold inflation hole on the side wall of each second half-shell, and a connecting sleeve mold gasket on the second half-shell at its splicing joint. Connecting buckles are engaged on the outer walls of both the base sleeve mold and the connecting sleeve mold, and the connecting buckles are secured by pins. An optical fiber is fixed on the inner wall of the integral structure formed by the splicing.

[0007] Preferably, the bottom casing mold base plate is semi-circular, and the circular hole of the casing mold base plate includes two semi-circular holes, which are located on the two bottom casing mold base plates respectively.

[0008] Preferably, the optical fiber passes through the circular hole in the bottom plate of the bottom casing mold, and the optical fiber is fixed on the bottom casing mold gasket and the connecting casing mold gasket.

[0009] Preferably, grout is injected into the interior of the whole.

[0010] Preferably, the connecting buckle includes two radially joined semi-rings, with a pin fastened to the joint of the two semi-rings.

[0011] In the above technical solution, the base casing mold is divided into a left casing and a right casing, with a height designed to be one standard section length. At the bottom of the base casing mold, both are semi-circular. After the bottom surfaces of the left and right casings are joined, a semi-circular hole is left at a certain distance from the apex of the inner diameter of the bottom surface into the casing for optical fiber insertion. After the optical fiber is inserted and joined, it is sealed with sealant. Above the bottom circular hole, along the joining line of the left and right casings, two shims are set, one above the other. The optical fiber is fixed to the shims, and during subsequent grouting, the shims are raised to the height of the grout, acting as a protective layer for the optical fiber. On the sides of the left and right casing molds, two air holes are left, one above the other. When grout is injected into the casing mold, the holes are sealed with plugs. After solidification, the plugs are removed, and high-pressure air guns are used to pressurize and separate the left and right casing molds from the optical fiber column. Within a certain range at the top of the base casing mold, the inner diameter of the casing remains unchanged, while the outer diameter is reduced to the original outer diameter - 0.5 × casing wall thickness, achieving the splicing of the base casing mold and the upper connecting casing mold.

[0012] The connecting sleeve mold consists of a left sleeve and a right sleeve, with a height designed to be one standard section length. Two shims are installed along the joining line of the left and right sleeves. The optical fiber is fixed to the shims, and during subsequent grouting, the shims raise the grout level, acting as a protective layer for the optical fiber. Two air holes are provided on the sides of each sleeve mold. When grout is injected into the sleeve mold, the holes are sealed with plugs. After solidification, the plugs are removed, and high-pressure air is applied to achieve demolding and separation of the left and right sleeve molds from the optical fiber column. Within a certain range at the bottom of the connecting sleeve mold, the outer diameter of the sleeve remains unchanged, while the inner diameter increases to the original inner diameter + 0.5 × sleeve wall thickness; within a certain range at the top, the inner diameter of the sleeve remains unchanged, while the outer diameter decreases to the original outer diameter - 0.5 × sleeve wall thickness. This allows for the splicing of the base sleeve mold with the connecting sleeve mold, and the next connecting sleeve mold with the previous connecting sleeve mold.

[0013] After the optical fiber is bonded, the base casing mold and the connecting casing mold are assembled, they are reinforced with connecting buckles and pins to ensure the stability of the device during grouting.

[0014] This invention provides a portable binding and fixing device for distributed optical fiber testing. The device, consisting of a base sleeve mold with a circular hole at the bottom, a connecting sleeve mold, and a connecting buckle, allows for the fixing of the optical fiber inside the sleeve mold. After the grout has hardened and solidified, the mold can be removed and reused. The resulting pre-embedded optical fiber column can be used for distributed optical fiber monitoring tests. Compared to the method of binding and fixing optical fibers by pasting them onto the outside of PVC pipes, this invention effectively protects the integrity of the optical fiber, eliminates the inconsistency between the PVC pipe and the optical fiber deformation, reduces data inaccuracies, and uses a reusable sleeve mold, reducing the use of PVC pipes.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Traditional fiber optic cable laying methods involve binding the fiber optic cable to the outside of a PVC pipe, inserting it into the borehole, and then continuing grouting inside the hole. This new technology uses the same grouting material inside the casing mold as the material used in the later drilling. Considering the thinner PVC pipes used in the traditional method and the thinner wall of the casing mold used in this patent, the total grouting volume inside the borehole is essentially the same in both methods. Furthermore, the cost of the grouting material is borne by the construction unit, and both the casing mold and the grout mold can be reused. Therefore, fiber optic monitoring units can save on the cost of PVC pipes without increasing other material costs when using this technology.

[0017] 2. A portable binding and fixing device for distributed optical fiber testing, through innovative design, can effectively protect the integrity of optical fibers, reduce fiber damage and data inaccuracy compared with traditional methods, enhance the robustness of optical fiber monitoring deployment, reduce the labor and material costs of maintenance and repair, reduce the risk of monitoring failure due to optical fiber damage, and improve overall economic efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model patent;

[0019] Figure 2 This is a top view of the overall structure of this utility model patent;

[0020] Figure 3 This is a schematic diagram of the bottom protective sleeve mold for this utility model patent;

[0021] Figure 4 This is a top view of the bottom protective sleeve mold of this utility model patent;

[0022] Figure 5 This is a schematic diagram of the connecting sleeve mold for this utility model patent;

[0023] Figure 6 This is a top view of the connecting sleeve mold of this utility model patent;

[0024] Figure 7 This is a schematic diagram of the connecting buckle and pin of this utility model patent;

[0025] In the picture:

[0026] 1. Base sleeve mold; 2. Connecting sleeve mold; 3. Connecting buckle; 4. Pin; 5. Optical fiber; 6. Bottom sleeve mold base plate; 7. Bottom sleeve mold inflation hole; 8. Bottom sleeve mold gasket; 9. Bottom sleeve mold base plate round hole; 10. Connecting sleeve mold inflation hole; 11. Connecting sleeve mold gasket. Detailed Implementation

[0027] The specific embodiments of this utility model will be described in detail below. To avoid excessive and unnecessary details, well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments can be used for quantitative descriptions, indicating that a certain degree of variation in quantity is permissible without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this utility model pertains.

[0028] Example 1

[0029] Please see Figure 1-7 A portable binding and fixing device for distributed optical fiber testing includes a bottom protective sleeve mold 1, which is divided into left and right halves. Each half of the bottom protective sleeve mold 1 has a mold base plate 6 at its bottom, with a circular hole 9 near the top. The diameter of the circular hole 9 at the bottom of the bottom protective sleeve mold is approximately the diameter of the optical fiber 5 that can be inserted. Two bottom protective sleeve mold inflation holes 7 are distributed on each side of the left and right protective sleeves of the bottom protective sleeve mold 1. At the closure joint on one side of the circular hole 9, two bottom protective sleeve mold gaskets 8 are provided along the joint seam. The bottom protective sleeve mold 1 can be vertically spliced ​​with the connecting protective sleeve mold 2. The connecting sleeve mold 2 is divided into left and right halves. On the left and right sides of the connecting sleeve mold 2, there are two connecting sleeve mold inflation holes 10. At the closure joint that is aligned with the bottom sleeve mold round hole 9, the connecting sleeve mold 2 is provided with two connecting sleeve mold gaskets 11 along the splice seam. The connecting sleeve mold 2 can be spliced ​​with other connecting sleeve molds above it.

[0030] Within a certain range at the top of the base protective sleeve mold 1, the inner diameter of the protective sleeve remains unchanged, while the outer diameter is reduced to the original outer diameter - 0.5 × the wall thickness of the protective sleeve, thereby achieving the splicing of the base protective sleeve mold 1 and the upper connecting protective sleeve mold 2.

[0031] Within a certain range at the bottom of the connecting sleeve mold 2, the outer diameter of the sleeve remains unchanged, while the inner diameter increases to the original inner diameter + 0.5 × sleeve wall thickness; within a certain range at the top, the inner diameter of the sleeve remains unchanged, while the outer diameter decreases to the original outer diameter - 0.5 × sleeve wall thickness. This enables the splicing of the base sleeve mold 1 with the connecting sleeve mold 2, and the next connecting sleeve mold with the previous connecting sleeve mold.

[0032] Among them, the optical fiber 5 is bonded to the bottom protective sleeve mold gasket 8 and the connecting protective sleeve mold gasket 11 by an adhesive bonding method.

[0033] Among them, the base sleeve mold 1 is reinforced by connecting buckle 3 and pin 4 after alignment and closure.

[0034] Among them, after the connecting sleeve mold 2 is aligned and closed, the connecting buckle 3 and the pin 4 are used for reinforcement.

[0035] The method of using the device includes the following steps:

[0036] S1: Clean all parts of the mold and apply release agent;

[0037] S2: Insert the optical fiber through the round hole at the bottom of the base sleeve mold, straighten it, and glue it to the base sleeve mold pad with adhesive.

[0038] S3: The base sleeve mold is closed, the bottom round hole is sealed with sealant, the air hole on the side wall of the sleeve is sealed with plugs, and it is reinforced with connecting buckles and pins;

[0039] S4: The installation method for multi-section connecting casing molds is the same as steps S2 and S3;

[0040] S5: Grouting of voids inside the borehole;

[0041] S6: After solidification, remove the side plug, and remove the connecting buckle and pin;

[0042] S7: Pressurize the air inlet with a high-pressure air gun from top to bottom to demold;

[0043] S8: The processed fiber optic column is embedded in the borehole for monitoring.

[0044] Example 2

[0045] A portable binding and fixing device for distributed optical fiber testing, such as Figures 1 to 7As shown, the system includes a base sleeve mold 1 and a connecting sleeve mold 2 that are joined end-to-end along the axial direction. The base sleeve mold 1 includes two radially spliced ​​first half-shells. The bottom of the first half-shell has a bottom sleeve mold base plate 6. The side wall of the first half-shell has a bottom sleeve mold inflation hole 7. The first half-shell has a bottom sleeve mold gasket 8 located at its splicing joint. The bottom sleeve mold base plate 6 has a bottom sleeve mold base plate circular hole 9. The connecting sleeve mold 2 includes two radially spliced ​​second half-shells. The side wall of the second half-shell has a connecting sleeve mold inflation hole 10. The second half-shell has a connecting sleeve mold gasket 11 located at its splicing joint. Connecting buckles 3 are attached to the outer walls of both the base sleeve mold 1 and the connecting sleeve mold 2. The connecting buckles 3 are fastened by pins 4. An optical fiber 5 is fixed on the inner wall of the entire system formed by the joint.

[0046] Example 3

[0047] A portable binding and fixing device for distributed optical fiber testing, such as Figures 1 to 7 As shown, the system includes a base sleeve mold 1 and a connecting sleeve mold 2 that are joined end-to-end along the axial direction. The base sleeve mold 1 includes two radially spliced ​​first half-shells. The bottom of the first half-shell has a bottom sleeve mold base plate 6. The side wall of the first half-shell has a bottom sleeve mold inflation hole 7. The first half-shell has a bottom sleeve mold gasket 8 located at its splicing joint. The bottom sleeve mold base plate 6 has a bottom sleeve mold base plate circular hole 9. The connecting sleeve mold 2 includes two radially spliced ​​second half-shells. The side wall of the second half-shell has a connecting sleeve mold inflation hole 10. The second half-shell has a connecting sleeve mold gasket 11 located at its splicing joint. Connecting buckles 3 are attached to the outer walls of both the base sleeve mold 1 and the connecting sleeve mold 2. The connecting buckles 3 are fastened by pins 4. An optical fiber 5 is fixed on the inner wall of the entire system formed by the joint. The bottom casing mold base plate 6 is semi-circular, and the circular hole 9 on the bottom casing mold base plate includes two semi-circular holes, which are located on two separate bottom casing mold base plates 6. An optical fiber 5 passes through the circular hole 9 on the bottom casing mold base plate and is fixed to the bottom casing mold gasket 8 and the connecting casing mold gasket 11. Grout is injected into the interior of the entire assembly. The connecting buckle 3 includes two radially spliced ​​semi-rings, and a pin 4 is fastened to the splicing position of the two semi-rings.

[0048] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of this utility model application should be included within the protection scope of this utility model.

Claims

1. A portable binding and fixing device for distributed optical fiber testing, characterized in that, The system includes a base sleeve mold (1) and a connecting sleeve mold (2) that are joined end-to-end along the axial direction. The base sleeve mold (1) includes two first half shells that are spliced ​​together radially. The bottom end of the first half shell has a bottom sleeve mold base plate (6). The side wall of the first half shell has a bottom sleeve mold inflation hole (7). The first half shell has a bottom sleeve mold gasket (8) located at its splicing joint. The bottom sleeve mold base plate (6) has a bottom sleeve mold base plate round hole (9). The connecting sleeve mold (2) includes two second half shells that are spliced ​​together radially. The side wall of the second half shell has a connecting sleeve mold inflation hole (10). The second half shell has a connecting sleeve mold gasket (11) located at its splicing joint. Connecting buckles (3) are attached to the outer wall of the base sleeve mold (1) and the outer wall of the connecting sleeve mold (2). The connecting buckles (3) are fastened by pins (4). An optical fiber (5) is fixed on the inner wall of the system formed by the joint.

2. The portable binding and fixing device for distributed optical fiber testing according to claim 1, characterized in that, The bottom protective sleeve mold base plate (6) is semi-circular, and the round hole (9) of the bottom protective sleeve mold base plate includes two semi-circular holes, which are located on the two bottom protective sleeve mold base plates (6) respectively.

3. A portable binding and fixing device for distributed optical fiber testing according to claim 1, characterized in that, The optical fiber (5) passes through the round hole (9) on the bottom plate of the bottom protective mold and is fixed on the bottom protective mold pad (8) and the connecting protective mold pad (11).

4. A portable binding and fixing device for distributed optical fiber testing according to claim 1, characterized in that, Grouting material is injected into the interior of the entire structure.

5. A portable binding and fixing device for distributed optical fiber testing according to claim 1, characterized in that, The connecting buckle (3) includes two radially spliced ​​semi-rings, and the pin (4) is fastened to the splicing position of the two semi-rings.

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