A kind of optical fiber comprehensive measuring sensor for hole diameter and verticality in pile foundation drilling construction

Abstract

The application provides a kind of pile foundation drilling construction bore diameter and verticality optical fiber comprehensive measurement sensor, belongs to the field of measurement sensor.The sensor includes stainless steel main frame, n optical fiber measuring device, wireless gyroscope, optical fiber demodulator and wireless data receiver.The wireless gyroscope is installed at the bottom of the stainless steel main frame, n through holes are opened on the stainless steel main frame, and an optical fiber measuring device is installed in each through hole.The application solves the problems of low precision, high cost and complicated operation of the existing bore diameter and verticality detection equipment, realizes accurate measurement of bore diameter and verticality during pile foundation construction, and the equipment can be reused, is simple to operate, low in cost and widely applicable.

Description

Technical Field

[0001] The present invention relates to the field of measuring equipment, in particular to an optical fiber comprehensive measuring sensor for hole diameter and verticality in pile foundation drilling construction. Background Art

[0002] During the construction of pile foundation projects, the pile holes must be measured after construction is completed to check whether the pile hole diameter meets the construction requirements. However, it is impossible to manually go down to the bottom of the pile to measure, so many devices for measuring hole diameter and verticality have emerged.

[0003] For example, Chinese patent document CN202578672U discloses a "well diameter measuring device for measuring the diameter of a pile hole". The device achieves hole diameter measurement by reciprocating the measuring device up and down in the pile hole, but the device requires a motor for control, and on-site operation is cumbersome.

[0004] Chinese patent document CN212340134U discloses a "Simplified Device for Measuring the Diameter of Bored Pile and the Diameter of the Expanded Head." This device measures the pile diameter by adding the scale values ​​on the surfaces of two horizontal measuring rods placed in the pile hole to the lengths of the pile casing and the fixed tube. However, this device relies on manual readings, resulting in limited accuracy.

[0005] Chinese patent document CN113324460B discloses a "pile hole diameter detection device for supervision", which uses a diameter measuring component to extend into the pile hole to detect the diameter of the pile hole, but the device is large in size and inconvenient to set up and measure.

[0006] Chinese patent document CN113654522B discloses a method for measuring the verticality of rotary bored pile holes while drilling. This method uses a measurement while drilling device to collect and store the posture data of each measuring section of the pile hole. The host computer calculates the pile hole trajectory to obtain the verticality of the pile hole and the inclination angle of each measuring section of the pile hole. However, this device cannot measure the diameter of the pile hole.

[0007] Chinese patent document CN105927213A discloses a device and method for accurately measuring the verticality of bored pile holes. This device uses a laser transmitter and receiver that travel at a constant speed along a track, emitting a vertically downward laser signal and reflecting the laser signal vertically upward upon encountering the borehole boundary. However, the high cost of the laser in this device has hindered widespread adoption.

[0008] Chinese patent document CN220602395U discloses "A device for detecting the diameter, hole depth and sediment thickness of bored piles." This device sets a diameter measuring disk with an outer diameter that is the same as the hole diameter of the bored pile. The diameter measuring disk can be placed on the upper surface of the sediment layer for measurement. However, the device does not take into account the increase in hole diameter during the lowering process, which can easily cause measurement errors.

[0009] In summary, existing aperture and verticality detection equipment have problems such as low accuracy, high cost, and cumbersome operation. Based on this, the present invention designs an optical fiber comprehensive measurement sensor for aperture and verticality in pile foundation drilling construction. Summary of the Invention

[0010] The purpose of the present invention is to address the defects of the prior art, specifically, to achieve accurate measurement of hole diameter and hole verticality during pile foundation construction.

[0011] In order to achieve the above-mentioned purpose, the present invention intends to adopt the following technical solutions.

[0012] An optical fiber integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction, comprising a stainless steel main frame, n optical fiber measurement devices, n optical fibers, a wireless gyroscope, an optical fiber demodulator, and a wireless data receiver;

[0013] The stainless steel main frame is a cylinder, and the rotation axis of the wireless gyroscope is coaxial with the stainless steel main frame and fixed to the bottom of the stainless steel main frame; n through holes penetrating the cylinder are opened on the stainless steel main frame;

[0014] The optical fiber measuring device includes a protective sleeve, a fixing column, a limiting ring, a transfer column, a sleeve, a tail column, a spring and an optical fiber bracket. The optical fiber bracket is T-shaped and includes an optical fiber support and a top plate located on the top of the optical fiber support.

[0015] The protective sleeve, fixed column, limiting ring, transfer column, sleeve, and tail column are coaxial, wherein the protective sleeve, fixed column, limiting ring, and sleeve are all hollow cylinders with openings at both ends, the outer diameter and length of the fixed column are adapted to the through hole, the outer diameter of the protective sleeve is smaller than the outer diameter of the fixed column, the outer diameter of the limiting ring is larger than the outer diameter of the fixed column, and the inner diameter of the sleeve is adapted to the outer diameter of the transfer column;

[0016] One end of the fixing post is fixedly connected to the protective sleeve, and the other end is fixedly connected to the limiting ring. The optical fiber holder is located in the inner cavity of the limiting ring, and the bottom end face of the optical fiber pillar is fixedly connected to the tail end face of the fixing post. The pillar body extends to the middle part of the limiting ring along the axial direction of the limiting ring. The transfer post is partially located in the inner cavity of the limiting ring, one end of which is fixedly connected to the top plate of the optical fiber holder, and the other end extends out of the limiting ring and is inserted into the sleeve, and the other end of the sleeve is fixedly connected to the tail post; the spring is sleeved on the transfer post, and when working, one end presses against the top plate of the optical fiber holder, and the other end presses against the end face of the open end of the sleeve; after the optical fiber passes through the protective sleeve and the fixing post in sequence and enters the inner cavity of the limiting ring, it extends along the optical fiber pillar and is adhered to the optical fiber pillar;

[0017] Pass the optical fiber measuring device through the through hole from one end of the protective cover, and fix n optical fiber measuring devices on the stainless steel main frame by fixing the fixing column to the through hole;

[0018] The optical fiber demodulator is connected to the optical fiber;

[0019] The wireless data receiver receives data from the wireless gyroscope.

[0020] Preferably, the positions of the through holes are as follows: the spacing between adjacent through holes in the axial direction of the stainless steel main frame is 2.0 cm, and each through hole is ≥5.0 cm away from both ends of the stainless steel main frame.

[0021] Preferably, the fixing is welding.

[0022] Preferably, the n optical fibers are divided into N groups, and only one optical fiber in each group is connected to the optical fiber demodulator. This optical fiber is recorded as the reference optical fiber, and the other optical fibers are recorded as non-reference optical fibers. Specifically, one end of the reference optical fiber is connected to the optical fiber demodulator, and the other end passes through the protective cover of an optical fiber measuring device to enter the optical fiber measuring device, and a non-reference optical fiber is fused to the position before entering the protective cover. This non-reference optical fiber serves as the optical fiber entering the second optical fiber measuring device. This non-reference optical fiber passes through the protective cover of the second optical fiber measuring device to enter the second optical fiber measuring device, and another non-reference optical fiber is fused to the position before entering the protective cover. This non-reference optical fiber serves as the optical fiber entering the third optical fiber measuring device, and so on, to obtain optical fibers corresponding to all optical fiber measuring devices in the group.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention designs an optical fiber comprehensive measurement sensor for hole diameter and verticality in pile foundation drilling construction, which measures the pile hole diameter through sensing optical fiber and has high measurement accuracy.

[0025] (2) This device detects the verticality of the pile hole through a wireless gyroscope and adopts wireless data transmission, which makes data viewing convenient.

[0026] (3) The device only needs to place the sensor into the pile hole, and the pile hole diameter and verticality can be converted through the data of the optical fiber demodulator and the wireless data receiver. The equipment is reusable, simple to operate and low in cost.

[0027] (4) The length of the optical fiber measuring device can be freely selected according to the pile hole diameter. This device is suitable for measuring all pile diameters and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of an optical fiber comprehensive measurement sensor for aperture and verticality in pile foundation drilling construction.

[0029] Figure 2 This is a schematic diagram of the stainless steel main frame structure.

[0030] Figure 3 Schematic diagram of the optical fiber measurement device.

[0031] Figure 4 Schematic diagram of the internal structure of the limit ring.

[0032] Figure numerals: 1. stainless steel main frame; 2. optical fiber measuring device; 3. wireless gyroscope; 5. lifting ring; 6. through hole; 7. optical fiber support; 8. optical fiber; 9. connector; 10. protective cover; 11. fixing column; 12. limiting ring; 13. spring; 14. sleeve; 15. tail column; 16. roller bracket; 17. roller; 19. transfer column; 20. top plate; 21. optical fiber demodulator; 22. wireless data receiver. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 Schematic diagram of the structure of an optical fiber integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction. Figure 2 Schematic diagram of the stainless steel main frame structure, Figure 3 Schematic diagram of the optical fiber measurement device structure. Figure 4 Schematic diagram of the internal structure of the limit ring. Figures 1-4 It can be seen that the present invention provides a fiber optic comprehensive measurement sensor for aperture and verticality in pile foundation drilling construction, including a stainless steel main frame 1, n fiber optic measuring devices 2, n optical fibers 8, a wireless gyroscope 3, a fiber optic demodulator 21 and a wireless data receiver 22.

[0035] The stainless steel main frame 1 is a cylinder. The rotation axis of the wireless gyroscope 3 is coaxial with the stainless steel main frame 1 and is fixed to the bottom of the stainless steel main frame 1. The stainless steel main frame 1 is provided with n through holes 6 penetrating the cylinder.

[0036] In this embodiment, the positions of the through holes 6 are as follows: the spacing between adjacent through holes 6 in the axial direction of the stainless steel main frame 1 is 2.0 cm, and each through hole 6 is ≥5 cm away from both ends of the stainless steel main frame 1.

[0037] from Figure 1 It can be seen that in this embodiment, n=6, which is divided into two groups, each with three through holes 6 corresponding to six optical fiber measuring devices 2. In addition, a lifting ring 5 is provided on the top of the stainless steel main frame 1 to facilitate operation during construction.

[0038] The optical fiber measuring device 2 includes a protective cover 10, a fixing column 11, a limiting ring 12, a transfer column 19, a sleeve 14, a tail column 15, a spring 13 and an optical fiber bracket. The optical fiber bracket is T-shaped and includes an optical fiber support 7 and a top plate 20 located on the top of the optical fiber support 7.

[0039] The protective sleeve 10, the fixed column 11, the limiting ring 12, the transfer column 19, the sleeve 14, and the tail column 15 are coaxial, wherein the protective sleeve 10, the fixed column 11, the limiting ring 12, and the sleeve (14) are all hollow cylinders with openings at both ends. The outer diameter and length of the fixed column 11 are adapted to the through hole 6. The outer diameter of the protective sleeve 10 is smaller than the outer diameter of the fixed column 11, and the outer diameter of the limiting ring 12 is larger than the outer diameter of the fixed column 11. The inner diameter of the sleeve 14 is adapted to the outer diameter of the transfer column 19.

[0040] One end of the fixing post 11 is fixedly connected to the protective sleeve 10, and the other end is fixedly connected to the limiting ring 12. The optical fiber holder is located in the inner cavity of the limiting ring 12. The bottom end face of the optical fiber pillar 7 is fixedly connected to the tail end face of the fixing post 11. The pillar body extends along the axial direction of the limiting ring 12 to the middle part of the limiting ring 12. The transfer post 19 is partially located in the inner cavity of the limiting ring 12. One end of the transfer post 19 is fixedly connected to the top plate 20 of the optical fiber holder, and the other end extends out of the limiting ring 12 and is inserted into the sleeve 14. The other end of the sleeve 14 is fixedly connected to the tail post 15. The spring 13 is sleeved on the transfer post 19. During operation, one end of the spring 13 presses against the top plate 20 of the optical fiber holder, and the other end presses against the end face of the open end of the sleeve 14. The optical fiber 8 passes through the protective sleeve 10 and the fixing post 11 in sequence and enters the inner cavity of the limiting ring 12. It then extends along the optical fiber pillar 7 and is adhered to the optical fiber pillar 7.

[0041] The optical fiber measuring device 2 is passed through the through hole 6 from one end of the protective cover 10 , and the n optical fiber measuring devices 2 are fixed on the stainless steel main frame 1 by fixing the fixing column 11 to the through hole 6 .

[0042] The optical fiber demodulator 21 is connected to the optical fiber 8 , and the wireless data receiver 22 receives data from the wireless gyroscope 3 .

[0043] In this embodiment, the fixing column 11 is designed as a series of products with different lengths according to the diameter of the pile hole in actual production to meet the needs of different pile holes.

[0044] In this embodiment, the optical fiber measuring device 2 further includes a roller 17 , which is mounted on the tail of the tail post 15 via a roller bracket 16 .

[0045] In this embodiment, the fixing is welding.

[0046] In this embodiment, the n optical fibers are divided into N groups, and only one optical fiber 8 in each group is connected to the optical fiber demodulator 21. This optical fiber 8 is recorded as a reference optical fiber, and the other optical fibers 8 are recorded as non-reference optical fibers. Specifically, one end of the reference optical fiber is connected to the optical fiber demodulator 21, and the other end passes through the protective cover 10 of an optical fiber measuring device 2 to enter the optical fiber measuring device 2, and a non-reference optical fiber is fused at the position before entering the protective cover 10. This non-reference optical fiber serves as the optical fiber 8 entering the second optical fiber measuring device 2. This non-reference optical fiber passes through the protective cover 10 of the second optical fiber measuring device 2 to enter the second optical fiber measuring device 2, and another non-reference optical fiber is fused at the position before entering the protective cover 10. This non-reference optical fiber serves as the optical fiber 8 entering the third optical fiber measuring device 2, and so on. The optical fibers 8 corresponding to all the optical fiber measuring devices 2 in the group are obtained.

[0047] from Figure 1 It can be seen that in this embodiment, N=2, each group consists of 3 optical fibers, and the last 2 optical fibers are connected to the optical fiber demodulator 21. Figure 1 It can be seen that a connector 9 is placed at the fusion joint of the two optical fibers 8 to protect the fusion joint.

[0048] In this example, the GYTV1600 fiber Bragg grating interrogator from Guilin Guangyi Intelligent Technology Co., Ltd. was selected. This interrogator can be used with various fiber Bragg grating sensors to monitor aperture by detecting changes in the grating wavelength. The JTL-40FR wireless fiber optic gyroscope from Shanghai Changjili Geological Instrument Co., Ltd. was also selected. This gyroscope is a new inclinometer that uses a high-precision fiber optic gyroscope as a measuring element. It is a new high-precision digital borehole inclinometer specifically designed for measuring borehole inclination and azimuth in magnetic mining areas and iron casings. It is used for high-precision measurement of the verticality of various pile holes.

Claims

1. A fiber optic integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction, characterized in that: It comprises a stainless steel main frame (1), n ​​optical fiber measuring devices (2), n optical fibers (8), a wireless gyroscope (3), an optical fiber demodulator (21) and a wireless data receiver (22); The stainless steel main frame (1) is a cylinder, and the rotation axis of the wireless gyroscope (3) is coaxial with the stainless steel main frame (1) and fixed to the bottom of the stainless steel main frame (1); n through holes (6) are opened on the stainless steel main frame (1) and penetrate the cylinder; The optical fiber measuring device (2) comprises a protective cover (10), a fixing column (11), a limiting ring (12), a transmission column (19), a sleeve (14), a tail column (15), a spring (13) and an optical fiber support, wherein the optical fiber support is T-shaped and comprises an optical fiber support (7) and a top plate (20) located on the top of the optical fiber support (7); The protective sleeve (10), the fixed column (11), the limiting ring (12), the transmission column (19), the sleeve (14), and the tail column (15) are coaxial, wherein the protective sleeve (10), the fixed column (11), the limiting ring (12) and the sleeve (14) are both hollow cylinders with openings at both ends; the outer diameter and length of the fixing column (11) are adapted to the through hole (6); the outer diameter of the protective sleeve (10) is smaller than the outer diameter of the fixing column (11); the outer diameter of the limiting ring (12) is larger than the outer diameter of the fixing column (11); and the inner diameter of the sleeve (14) is adapted to the outer diameter of the transfer column (19); One end of the fixing column (11) is fixedly connected to the protective sleeve (10), and the other end is fixedly connected to the limiting ring (12). The optical fiber bracket is located in the inner cavity of the limiting ring (12). The bottom end face of the optical fiber pillar (7) is fixedly connected to the tail end face of the fixing column (11). The column body extends to the middle part of the limiting ring (12) along the axial direction of the limiting ring (12). The transmission column (19) is partially located in the inner cavity of the limiting ring (12). One end of the transmission column is fixedly connected to the top plate (20) of the optical fiber bracket, and the other end extends out of the limiting ring (12). The ring (12) is inserted into the sleeve (14), and the other end of the sleeve (14) is fixedly connected to the tail column (15); the spring (13) is sleeved on the transmission column (19), and when working, one end is pressed against the top plate (20) of the optical fiber bracket, and the other end is pressed against the end surface of the open end of the sleeve (14); the optical fiber (8) passes through the protective sleeve (10) and the fixing column (11) in sequence and enters the inner cavity of the limiting ring (12), then extends along the optical fiber pillar (7) and is adhered to the optical fiber pillar (7); Passing the optical fiber measuring device (2) through the through hole (6) from one end of the protective cover (10), and fixing the n optical fiber measuring devices (2) on the stainless steel main frame (1) by fixing the fixing column (11) to the through hole (6); The optical fiber demodulator (21) is connected to the optical fiber (8); The wireless data receiver (22) receives data from the wireless gyroscope (3).

2. The optical fiber integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction according to claim 1, characterized in that: The positions of the through holes (6) are as follows: the spacing between adjacent through holes (6) in the axial direction of the stainless steel main frame (1) is 2.0 cm, and each through hole (6) is ≥5 cm away from both ends of the stainless steel main frame (1).

3. The optical fiber integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction according to claim 1, characterized in that: The fixing is welding.

4. The optical fiber integrated measurement sensor for hole diameter and verticality in pile foundation drilling construction according to claim 1, characterized in that: The n optical fibers are divided into N groups, and only one optical fiber (8) in each group is connected to the optical fiber demodulator (21). The optical fiber (8) is recorded as a reference optical fiber, and the other optical fibers (8) are recorded as non-reference optical fibers. Specifically, one end of the reference optical fiber is connected to the optical fiber demodulator (21), and the other end passes through the protective cover (10) of an optical fiber measuring device (2) to enter the optical fiber measuring device (2), and a non-reference optical fiber is fused at a position before entering the protective cover (10). The non-reference optical fiber serves as the optical fiber (8) entering the second optical fiber measuring device (2). The non-reference optical fiber passes through the protective cover (10) of the second optical fiber measuring device (2) to enter the second optical fiber measuring device (2), and another non-reference optical fiber is fused at a position before entering the protective cover (10). The non-reference optical fiber serves as the optical fiber (8) entering the third optical fiber measuring device (2), and so on and so forth, to obtain the optical fibers (8) corresponding to all the optical fiber measuring devices (2) in the group.

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