CN113216207A - Underground diaphragm wall afterloading optical fiber monitoring device and construction method - Google Patents
Underground diaphragm wall afterloading optical fiber monitoring device and construction method Download PDFInfo
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- CN113216207A CN113216207A CN202110530376.3A CN202110530376A CN113216207A CN 113216207 A CN113216207 A CN 113216207A CN 202110530376 A CN202110530376 A CN 202110530376A CN 113216207 A CN113216207 A CN 113216207A
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- optical fiber
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention discloses an optical fiber monitoring device for after-loading of an underground diaphragm wall, which comprises a main rib and a winding device on the ground, wherein the outer side of the main rib is fixedly connected with a stirrup, the outer side of the stirrup is fixedly provided with a sleeve, the upper end of the sleeve is provided with a pipe cover, the inner part of the sleeve is fixedly connected with an optical fiber fixer, the inner part of the optical fiber fixer is connected with a rope in a sliding manner, one end of the rope is fixedly connected with a joint, one end of the joint is fixedly connected with an optical fiber sensor, the collecting device comprises a winding box, the upper end of the winding box is fixedly connected with a transverse plate, the lower end of the transverse plate is fixedly connected with a supporting frame, and the inner part of the supporting frame is rotatably connected with a winding roller. The invention relates to an underground diaphragm wall afterloading optical fiber monitoring device and a construction method, which have the characteristics of small influence by environmental factors, high durability and sensitivity, corrosion resistance, good long-term stability, convenient installation and labor saving.
Description
Technical Field
The invention belongs to the technical field of underground continuous walls, and particularly relates to a device for monitoring rear-mounted optical fibers of an underground continuous wall and a construction method.
Background
Along with the massive construction of high-rise buildings and underground infrastructure, the number of foundation pits is continuously increased, the scale is continuously enlarged, the depth of the foundation pits is also continuously increased, the underground continuous wall is one of the most common supporting modes of the deep foundation pits, in order to ensure the safety of the foundation pit construction, the common means is to carry out safety monitoring during the construction, the traditional manpower and electronic means such as an inclinometer, a total station and a steel bar stress meter are mainly adopted for the foundation pit monitoring at present, the optical fiber monitoring which is established in recent years is gradually applied to the foundation pit monitoring, and the distributed monitoring function of the foundation pits is realized. However, there are some problems with current fiber monitoring: 1. the labor consumption is large, so that the labor cost is too high, the monitoring efficiency is low, and the human error is large; 2. real-time monitoring cannot be achieved, data processing mainly depends on manual processing in the later period, information feedback is not timely enough, and the requirements of intelligent monitoring and information construction are difficult to achieve; 3. the arrangement of the measuring points is complicated, the survival rate of the measuring points is low, and the monitoring progress is often influenced; 4. the precision of the instrument is not high, and local slight change of a monitored object is difficult to reflect; 5. the monitoring instrument is easy to be damaged in construction, and the survival rate of the instrument is low. Therefore, it is desirable to design a fiber optic monitoring device for after-loading underground diaphragm walls.
The invention content is as follows:
the invention aims to solve the problems in the prior art and provide a device for monitoring the rear installation of an optical fiber on an underground diaphragm wall and a construction method thereof.
In order to solve the problems, the invention provides a device for monitoring the rear-mounted optical fiber of an underground diaphragm wall and a construction method, and the technical scheme comprises the following steps:
the rear-mounted optical fiber monitoring device for the underground diaphragm wall comprises a main rib and an underground winding device, wherein the outer side of the main rib is fixedly connected with a stirrup, the outer side of the stirrup is fixedly provided with a sleeve, the upper end of the sleeve is provided with a pipe cover, the inner part of the sleeve is fixedly connected with an optical fiber fixer, the inner part of the optical fiber fixer is slidably connected with a rope, one end of the rope is fixedly connected with a joint, one end of the joint is fixedly connected with an optical fiber sensor, the collecting device comprises a winding box, the upper end of the winding box is fixedly connected with a transverse plate, the lower end of the transverse plate is fixedly connected with a supporting frame, the supporting frame is rotatably connected with a winding roller, the winding roller is in winding connection with the rope, the optical fiber fixer is multiple in number, and the optical fiber fixers are uniformly distributed in the sleeve.
Preferably, a servo motor is fixedly connected to the outer side of the support frame, an output shaft of the servo motor is connected with the wind-up roll through a bolt, a moving plate is slidably connected to the interior of the wind-up box, four wheel carriers which are uniformly distributed are fixedly connected to the lower end of the moving plate, wheels are rotatably connected to the interior of the wheel carriers, four limit rods which are uniformly distributed are fixedly connected to the interior of the wind-up box, a bearing is fixedly sleeved on the interior of the wind-up box, a threaded cylinder is fixedly sleeved on the interior of the bearing, a bevel gear I is fixedly connected to the outer side of the threaded cylinder, a threaded rod is connected to the interior of the threaded cylinder through a thread, the threaded rod is fixedly connected with the moving plate, a forward and reverse motor is fixedly connected to the interior of the wind-up box, and a bevel gear II is fixedly connected to the tail end of an output shaft of the forward and reverse motor, the second bevel gear is meshed with the first bevel gear, a weight box is fixedly sleeved on the outer side of the winding box, a water inlet pipe is fixedly connected to the upper end of the weight box, a water drain pipe is fixedly sleeved inside the weight box, and a valve is arranged on the water drain pipe.
Preferably, a pulley is rotatably connected to the inside of the sleeve, and the outside of the pulley is slidably connected to the outside of the rope.
Preferably, the shape of the sleeve is U-shaped, and the main rib and the stirrup are perpendicular to each other.
Preferably, the optical fiber fixer is provided with a pouring hole, and the optical fiber fixer is provided with a through hole.
Preferably, the number of the perfusion holes is two, and the two perfusion holes are symmetrically distributed on the optical fiber fixer.
Preferably, a fixing ring is mounted on the outer side of the sleeve, and the fixing ring is fixed on the sleeve through a bolt and a nut.
A construction method for installing an optical fiber monitoring device behind an underground diaphragm wall comprises the following steps:
step one, fixing a main reinforcement and a stirrup into a reinforcement cage, fixing a sleeve outside the reinforcement cage, hoisting and lowering the reinforcement cage after the fixation is finished, covering a pipe cover when the reinforcement cage is lowered to a specified elevation, and pouring concrete of the underground continuous wall;
step two, when the concrete of the underground continuous wall meets the strength requirement, a pipe cover on the sleeve is opened, the optical fiber sensor is connected with a rope through a joint at one end of the sleeve, then the winding box is moved to the other end of the sleeve through wheels, a forward and reverse motor is started, the forward and reverse motor drives a bevel gear II to rotate, the bevel gear II drives a threaded cylinder to rotate through the bevel gear, the threaded cylinder drives a threaded rod to move upwards through thread matching with the threaded rod while rotating, the threaded rod drives a movable plate to move upwards while moving upwards, the movable plate can accommodate four wheels into the winding box, so that the winding box can be stably placed on the ground, then water is added into the weight box through a water inlet pipe, the gravity center of the whole device can be reduced, and the device is more stable when in use, after the fixation is finished, the rope is fastened on the outer side of the winding roller, then a servo motor is started, the servo motor drives the winding roller to rotate, the rope in the sleeve is pulled out through the rotation of the winding roller, the optical fiber sensor is moved into the sleeve to replace the rope, the optical fiber sensors with certain lengths are reserved at the two ends of the sleeve, and certain prestress is applied to the two ends of the optical fiber sensor;
placing guide pipes at two ends of the top of the sleeve, pouring micro-expansion concrete with the same strength as the underground continuous wall into the top of the sleeve, and continuously vibrating in the pouring process to enable the micro-expansion concrete to completely fill the sleeve;
and step four, when the concrete of the sleeve pipe reaches the standard strength requirement, connecting two ends of the optical fiber sensor to a distributed optical fiber demodulator, reading initial data, and reading data according to the construction process of the foundation pit to monitor the stress deformation state of the underground continuous wall under different working conditions.
The invention has the beneficial effects that: the invention relates to an underground diaphragm wall afterloading optical fiber monitoring device and a construction method, which have the characteristics of small influence by environmental factors, monitoring technology with high durability, high sensitivity, corrosion resistance and good long-term stability, convenience for installation and labor saving, and compared with the underground diaphragm wall afterloading optical fiber monitoring device and the construction method, the underground diaphragm wall afterloading optical fiber monitoring device and the construction method have the following two beneficial effects in specific use:
firstly, by additionally arranging structures such as a sleeve and a pipe cover inside the reinforcement cage, the outer side of the sleeve can be filled firstly when the reinforcement cage is filled, one sleeve is a detection position point, the problem of complicated point distribution can be avoided, and the optical fiber sensor can be effectively prevented from being damaged by arranging the optical fiber sensor inside the sleeve;
secondly, through adding in sheathed tube inside and establishing the optic fibre fixer, structures such as pulley and rope, when installing optical fiber sensor, can bring optical fiber sensor into sheathed tube inside through the rope, it is more convenient to make the installation, and pour into the concrete to sheathed tube inside again after the installation, make optical fiber sensor's survival rate obtain improving, when detecting, can carry out real-time supervision through optic fibre demodulation appearance, when carrying the pull rope, can pull it out through the receipts roll box, thereby can use manpower sparingly and improve work efficiency, and can make the device put more stably through withdrawing the wheel and adding and establishing structures such as weight box.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a concrete casting diagram of the underground diaphragm wall according to the present invention;
FIG. 2 is a view of the fiber optic sensor installation of the present invention;
FIG. 3 is a diagram of the casing concrete pour of the present invention;
FIG. 4 is a graph of data measurements according to the present invention;
FIG. 5 is a side view of the bushing of the present invention;
fig. 6 is a cross-sectional view of a cannula of the present invention.
FIG. 7 is a cross-sectional view of the roll-up bin of FIG. 2 of the present invention;
FIG. 8 is a left side view of FIG. 7 of the present invention;
fig. 9 is an enlarged view of the structure of part a of fig. 7 according to the present invention.
In the figure: 1. a main rib; 2. hooping; 3. a sleeve; 4. a tube cover; 5. an optical fiber holder; 6. a rope; 7. a pulley; 9. a joint; 10. an optical fiber sensor; 100. a winding device; 11. a rolling box; 12. a fixing ring; 13. a perfusion hole; 14. a through hole; 15. a servo motor; 16. moving the plate; 17. a wheel carrier; 18. a wheel; 19. a limiting rod; 20. a bearing; 21. a threaded barrel; 22. a first bevel gear; 23. a positive and negative rotation motor; 24. a second bevel gear; 25. a threaded rod; 26. a weight box; 27. a water inlet pipe; 28. a drain pipe; 29. a transverse plate; 30. a support frame; 31. and (7) winding the roller.
The specific implementation mode is as follows:
as shown in fig. 1 to 9, the following technical solutions are adopted in the present embodiment:
example (b):
an optical fiber monitoring device for after-loading of an underground diaphragm wall comprises a main rib 1 and a winding device 100 on the ground, wherein the outer side of the main rib 1 is fixedly connected with a stirrup 2, the outer side of the stirrup 2 is fixedly provided with a sleeve 3, the upper end of the sleeve 3 is provided with a tube cover 4, the inner part of the sleeve 3 is fixedly connected with an optical fiber fixer 5, the inner part of the optical fiber fixer 5 is slidably connected with a rope 6, one end of the rope 6 is fixedly connected with a joint 9, one end of the joint 9 is fixedly connected with an optical fiber sensor 10, the winding device 100 comprises a winding box 11, the upper end of the winding box 11 is fixedly connected with a transverse plate 29, the lower end of the transverse plate 29 is fixedly connected with a support frame 30, the inner part of the support frame 30 is rotatably connected with a winding roller 31, the winding roller 31 is wound with the rope 6, and the number of the optical fiber fixer 5 is multiple, a plurality of the optical fiber holders 5 are uniformly distributed inside the sleeve 3, and the optical fiber holders 5 can fix the optical fiber sensor 10.
Wherein, the outside of the supporting frame 30 is fixedly connected with a servo motor 15, the output shaft of the servo motor 15 is connected with the wind-up roll 31 through a bolt, the inside of the winding box 11 is slidably connected with a moving plate 16, the lower end of the moving plate 16 is fixedly connected with four wheel carriers 17 which are uniformly distributed, the inside of the wheel carriers 17 is rotatably connected with a wheel 18, the inside of the winding box 11 is fixedly connected with four limiting rods 19 which are uniformly distributed, the limiting rods 19 are slidably connected with the moving plate 16, the inside of the winding box 11 is fixedly sleeved with a bearing 20, the inside of the bearing 20 is fixedly sleeved with a threaded cylinder 21, the outside of the threaded cylinder 21 is fixedly connected with a bevel gear I22, the inside of the threaded cylinder 21 is connected with a threaded rod 25 through a thread, the threaded rod 25 is fixedly connected with the moving plate 16, the inside of the winding box 11 is fixedly connected with a forward and reverse motor 23, the tail end of an output shaft of the forward and reverse rotating motor 23 is fixedly connected with a bevel gear II 24, the bevel gear II 24 is meshed with the bevel gear I22, a weight box 26 is fixedly sleeved on the outer side of the winding box 11, the upper end of the weight box 26 is fixedly connected with a water inlet pipe 27, a water outlet pipe 28 is fixedly sleeved inside the weight box 26, and a valve is arranged on the water outlet pipe 28 and can discharge water inside the weight box 26.
Wherein, the inside of sleeve 3 rotates and is connected with pulley 7, the outside of pulley 7 with the outside sliding connection of rope 6, pulley 7 can reduce the frictional force between rope 6 and sleeve 3.
The sleeve 3 is U-shaped, the main reinforcement 1 is perpendicular to the stirrup 2, and the main reinforcement 1 and the stirrup 2 are combined to form a reinforcement cage, which belongs to the prior art.
Wherein, the optical fiber fixer 5 is provided with a pouring hole 13, the optical fiber fixer 5 is provided with a through hole 14, and the through hole 14 is used for the movement of the rope 6.
The number of the pouring holes 13 is two, the two pouring holes 13 are symmetrically distributed on the optical fiber fixer 5, and the two pouring holes 13 can accelerate the entering speed of concrete.
Wherein, the fixed ring 12 is installed to the outside of sleeve pipe 3, fixed ring 12 passes through the bolt and the nut is fixed on sleeve pipe 3, and fixed ring 12 is used for sleeve pipe 3's fixed.
A construction method for installing an optical fiber monitoring device behind an underground diaphragm wall comprises the following steps:
step one, fixing a main reinforcement 1 and a stirrup 2 into a reinforcement cage, fixing a sleeve 3 on the outer side of the reinforcement cage, hoisting and lowering the reinforcement cage after the fixation is finished, covering a pipe cover 4 when the reinforcement cage is lowered to a specified elevation, and pouring concrete of the underground continuous wall;
step two, when the concrete of the underground continuous wall meets the strength requirement, opening the tube cover 4 on the sleeve 3, connecting the optical fiber sensor 10 with the rope 6 at one end of the sleeve 3 through the joint 9, then moving the winding box 11 to the other end of the sleeve 3 through the wheel 18, starting the forward and reverse motor 23, the forward and reverse motor 23 driving the bevel gear II 24 to rotate, the bevel gear II 24 driving the thread cylinder 21 to rotate through the bevel gear I22, the thread cylinder 21 driving the thread rod 25 to move upwards through the thread fit between the thread cylinder 21 and the thread rod 25 while rotating, the thread rod 25 driving the moving plate 16 to move upwards while moving upwards, the moving plate 16 can store the four wheels 18 into the winding box 11, so that the winding box 11 can be stably placed on the ground, then adding water into the weight box 26 through the water inlet tube 27, thereby lowering the center of gravity of the whole device, the optical fiber sensor fixing device is more stable in use, the rope 6 is fastened to the outer side of the winding roller 31 after the fixing is finished, then the servo motor 15 is started, the servo motor 15 drives the winding roller 31 to rotate, the rope 6 in the sleeve 3 is pulled out through the rotation of the winding roller 31, the optical fiber sensor 10 is moved into the sleeve 3 to replace the rope 6, the optical fiber sensors 10 with certain lengths are reserved at the two ends of the sleeve 3, and certain prestress is applied to the two ends of the optical fiber sensor 10;
placing guide pipes at two ends of the top of the sleeve 3, pouring micro-expansion concrete with the same strength as the underground continuous wall into the top of the sleeve 3, and continuously vibrating in the pouring process to enable the micro-expansion concrete to completely fill the sleeve 3;
and step four, when the concrete of the sleeve 3 reaches the standard strength requirement, connecting two ends of the optical fiber sensor 10 into the distributed optical fiber demodulator, reading initial data, and reading the data according to the construction process of the foundation pit to monitor the stress deformation state of the underground continuous wall under different working conditions.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. An underground continuous wall afterloading optical fiber monitoring device comprises a main rib (1) and a winding device (100) on the ground, and is characterized in that: the outer side of the main reinforcement (1) is fixedly connected with a stirrup (2), the outer side of the stirrup (2) is fixedly provided with a sleeve (3), the upper end of the sleeve (3) is provided with a pipe cover (4), the inner part of the sleeve (3) is fixedly connected with an optical fiber fixer (5), the inner part of the optical fiber fixer (5) is connected with a rope (6) in a sliding manner, one end of the rope (6) is fixedly connected with a joint (9), one end of the joint (9) is fixedly connected with an optical fiber sensor (10), the winding device (100) comprises a winding box (11), the upper end of the winding box (11) is fixedly connected with a transverse plate (29), the lower end of the transverse plate (29) is fixedly connected with a support frame (30), the inner part of the support frame (30) is rotatably connected with a winding roller (31), and the winding roller (31) is wound with the rope (6), the number of the optical fiber holders (5) is multiple, and the optical fiber holders (5) are uniformly distributed in the sleeve (3).
2. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 1, wherein: the outer side of the supporting frame (30) is fixedly connected with a servo motor (15), an output shaft of the servo motor (15) is connected with the winding roller (31) through a bolt, the inner portion of the winding box (11) is connected with a moving plate (16) in a sliding manner, the lower end of the moving plate (16) is fixedly connected with four wheel frames (17) which are uniformly distributed, the wheel frames (17) are rotatably connected with wheels (18) in the inner portion, the inner portion of the winding box (11) is fixedly connected with four limiting rods (19) which are uniformly distributed, the limiting rods (19) are connected with the moving plate (16) in a sliding manner, a bearing (20) is fixedly sleeved in the inner portion of the winding box (11), a threaded cylinder (21) is fixedly sleeved in the inner portion of the bearing (20), a bevel gear I (22) is fixedly connected to the outer side of the threaded cylinder (21), and a threaded rod (25) is connected to the inner portion of the threaded cylinder (21) through a thread, threaded rod (25) with movable plate (16) fixed connection, the inside fixedly connected with of rolling up case (11) is motor (23) just reversing, the terminal fixedly connected with bevel gear two (24) of the output shaft of motor (23) just reversing, bevel gear two (24) with bevel gear (22) meshing, weight box (26) have been fixed to have cup jointed in the outside of rolling up case (11), the upper end fixedly connected with inlet tube (27) of weight box (26), the inside fixed drain pipe (28) that has cup jointed of weight box (26), be equipped with the valve on drain pipe (28).
3. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 1, wherein: the inside of sleeve pipe (3) rotates and is connected with pulley (7), the outside of pulley (7) with the outside sliding connection of rope (6).
4. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 1, wherein: the sleeve (3) is U-shaped, and the main reinforcement (1) is perpendicular to the stirrup (2).
5. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 1, wherein: the optical fiber fixer (5) is provided with a pouring hole (13), and the optical fiber fixer (5) is provided with a through hole (14).
6. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 5, wherein: the number of the pouring holes (13) is two, and the two pouring holes (13) are symmetrically distributed on the optical fiber fixer (5).
7. An underground diaphragm wall afterloading optical fiber monitoring device according to claim 1, wherein: the outer side of the sleeve (3) is provided with a fixing ring (12), and the fixing ring (12) is fixed on the sleeve (3) through a bolt and a nut.
8. A construction method for afterloading an optical fiber monitoring device on an underground diaphragm wall is characterized in that: the method comprises the following steps:
fixing a main reinforcement (1) and a stirrup (2) into a reinforcement cage, fixing a sleeve (3) on the outer side of the reinforcement cage, hoisting and lowering the reinforcement cage after the fixation is finished, covering a pipe cover (4) when the reinforcement cage is lowered to a specified elevation, and pouring concrete of the underground continuous wall;
step two, when the concrete of the underground diaphragm wall meets the strength requirement, a tube cover (4) on a sleeve (3) is opened, an optical fiber sensor (10) is connected with a rope (6) through a joint (9) at one end of the sleeve (3), then a coiling box (11) is moved to the other end of the sleeve (3) through a wheel (18), a forward and reverse motor (23) is started, the forward and reverse motor (23) drives a bevel gear II (24) to rotate, the bevel gear II (24) drives a threaded cylinder (21) to rotate through a bevel gear I (22), the threaded cylinder (21) drives a threaded rod (25) to move upwards through thread matching with the threaded rod (25) while rotating, the threaded rod (25) drives a moving plate (16) to move upwards while moving upwards, and the moving plate (16) can accommodate four wheels (18) into the coiling box (11), the winding box (11) can be stably placed on the ground, water is added into the weight box (26) through the water inlet pipe (27), the gravity center of the whole device can be lowered, the device is more stable in use, the rope (6) is tied to the outer side of the winding roller (31) after the fixing is finished, then the servo motor (15) is started, the servo motor (15) drives the winding roller (31) to rotate, the rope (6) inside the sleeve (3) is pulled out through the rotation of the winding roller (31), the optical fiber sensor (10) is moved into the sleeve (3) to replace the rope (6), the optical fiber sensors (10) with certain lengths are reserved at the two ends of the sleeve (3), and certain prestress is applied to the two ends of the optical fiber sensor (10);
placing guide pipes at two ends of the top of the sleeve (3), pouring micro-expansion concrete with the same strength as the underground continuous wall into the top of the sleeve (3), and continuously vibrating in the pouring process to enable the micro-expansion concrete to completely fill the sleeve (3);
and step four, when the concrete of the sleeve (3) meets the standard strength requirement, connecting two ends of the optical fiber sensor (10) into the distributed optical fiber demodulator, reading initial data, and reading data according to the construction process of the foundation pit to monitor the stress deformation state of the underground diaphragm wall under different working conditions.
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| CN113216207B (en) | 2022-05-10 |
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