CN215053334U

CN215053334U - Optical fiber protection monitoring device for underground diaphragm wall

Info

Publication number: CN215053334U
Application number: CN202121036906.0U
Authority: CN
Inventors: 耿东锋; 孙松林; 杨华; 闫谋权; 余进松; 赫学林; 罗威力; 胡宁
Original assignee: Guangzhou University; China Railway First Engineering Group Co Ltd; China Railway First Engineering Group Guangzhou Construction Engineering Co Ltd
Current assignee: Guangzhou University; China Railway First Engineering Group Co Ltd; China Railway First Engineering Group Guangzhou Construction Engineering Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-12-07
Anticipated expiration: 2031-05-14

Abstract

The utility model belongs to the technical field of foundation ditch engineering underground continuous wall, concretely relates to an optic fibre protection monitoring devices for underground continuous wall, including main muscle, the outside fixedly connected with stirrup of main muscle, the inside fixedly connected with of main muscle allies oneself with the muscle, the packing has the concrete around main muscle and stirrup, and the edge of concrete is the pore wall, and the outside fixedly connected with concrete of stirrup protects a section of thick bamboo, and the upper end fixedly connected with protection line box of concrete protection section of thick bamboo. The utility model has the characteristics of simple structure, high sensitivity, stable performance and easy realization of the measurement of the micro displacement of the underground diaphragm wall; the optical fiber sensor is protected in the concrete pouring and pile head breaking processes, and the survival rate of the sensor is improved; the strain transmission error of the optical fiber packaging material caused by different elastic moduli is eliminated, and the monitoring precision is improved.

Description

Optical fiber protection monitoring device for underground diaphragm wall

Technical Field

The utility model relates to a foundation ditch engineering underground continuous wall technical field specifically is an optic fibre protection monitoring devices for underground continuous wall.

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, when the foundation pits are excavated, the underground continuous wall bears great soil pressure, how to effectively monitor the deformation of the underground continuous wall in the construction process, the safety and the stability of the foundation pits are ensured to become a focus and a research hotspot concerned by engineering circles, in order to ensure the safety of the foundation pit construction, the common means is to carry out safety monitoring during the construction, and at present, the foundation pit monitoring mainly adopts traditional manpower and electronic means such as an inclinometer, a total station and a steel bar stress meter.

In the prior art, when the underground diaphragm wall is constructed, the labor consumption is large, so that the labor cost is too high, the monitoring efficiency is low, the human error is large, the real-time monitoring cannot be realized, the data processing mainly depends on the manual processing in the later period, the information feedback is not timely enough, and the requirements of intelligent monitoring and information construction are difficult to achieve; the arrangement of the measuring points is complicated, the survival rate of the measuring points is low, and the monitoring progress is often influenced; the precision of the instrument is not high, and local slight change of a monitored object is difficult to reflect; the monitoring instrument is easy to be damaged in construction, and the survival rate of the instrument is low. Accordingly, there is a need for improvements in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an optic fibre protection monitoring devices for diaphragm wall has solved measuring device's durability, diaphragm wall stress and the problem of meeting an emergency, automatic monitoring and early warning function, monitoring instrument's survival rate and the transmission of meeting an emergency.

In order to achieve the above object, the utility model provides a following technical scheme: an optical fiber protection monitoring device for an underground diaphragm wall comprises a main rib, wherein a stirrup is fixedly connected to the outer side of the main rib, a tie bar is fixedly connected to the inner part of the main rib, concrete is filled around the main rib and the stirrup, the edge of the concrete is a hole wall, a concrete protection cylinder is fixedly connected to the outer side of the stirrup, a protection wire box is fixedly connected to the upper end of the concrete protection cylinder, an optical fiber wire head is arranged inside the protection wire box, the concrete protection cylinder comprises a circular protection cylinder, an optical fiber sensor is arranged at the center inside of the circular protection cylinder, a surrounding rib is arranged inside the surrounding rib, a transverse connecting rib is arranged inside the surrounding rib, two ends of the transverse connecting rib are respectively fixedly connected with the longitudinal rib and the optical fiber sensor, concrete is poured inside the circular protection cylinder, and a plurality of annular fixing belts are sleeved on the outer side of the circular protective cylinder.

Preferably, the two ends of the main reinforcement are fixedly connected with I-shaped steel, and the I-shaped steel is in contact with concrete.

Preferably, the upper end of the main rib is fixedly connected with two hanging rings, and the two hanging rings are symmetrically distributed on the main rib.

Preferably, the circular casing is made of two semi-circular arc-shaped rigid materials, and the annular fixing bands are uniformly distributed on the outer side of the circular casing.

Preferably, the inside parcel of concrete has around muscle, optical fiber sensor, indulges muscle and transverse connection muscle, transverse connection muscle is the cross type.

Preferably, the top end of the optical fiber sensor penetrates through the protection box to be fixedly connected with the optical fiber stub, and the top of the protection box is hinged with the box cover.

Preferably, the concrete casing is U-shaped, and two hoops are arranged on the concrete casing.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model has the characteristics of simple structure, sensitivity are high, stable performance, the small displacement measurement of underground continuous wall easily realize, optic fibre has its unique advantage: the volume is small, the weight is light, and the sensing is convenient; the anti-electromagnetic interference, good stability and corrosion resistance; high sensitivity and high resolution.

2. The utility model discloses an add in the inside of concrete and establish optical fiber sensor isotructure and realized that underground continuous wall warp automatic and real-time detection, have measure convenient, measurement of efficiency high, little, but advantage such as real-time early warning are influenced by measurement environment, realized intelligent measurement's function, make the measurement informationization.

3. The utility model discloses an add on a concrete protects a section of thick bamboo and establish the protection line box for protect optical fiber sensor at concrete placement and broken pile head process, improved the survival rate of sensor.

4. The utility model discloses a concrete sleeve encapsulation optical fiber sensor has eliminated optic fibre packaging material because the different transmission error that meets an emergency that arouses of elastic modulus, has improved the monitoring precision.

Drawings

FIG. 1 is a side view of the reinforcement cage of the underground continuous wall of the utility model;

FIG. 2 is a cross-sectional view of the reinforcement cage of the underground continuous wall of the utility model;

FIG. 3 is a cross-sectional view of the concrete sleeve of the present invention;

fig. 4 is a cross-sectional view of the concrete sleeve of the present invention.

In the figure: 1. a main rib; 2. hooping; 3. a concrete casing; 4. protecting the wire box; 5. a hoisting ring; 6. an optical fiber stub; 7. encircling the ribs; 8. an optical fiber sensor; 9. longitudinal ribs; 10. transverse connecting ribs; 11. an annular securing strap; 12. connecting ribs; 13. a hole wall; 14. concrete; 15. i-shaped steel; 16. and (5) a circular protective cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, an optical fiber protection monitoring device for an underground diaphragm wall comprises a main reinforcement 1, a stirrup 2 fixedly connected to the outer side of the main reinforcement 1, a connection reinforcement 12 fixedly connected to the inner side of the main reinforcement 1, concrete 14 filled around the main reinforcement 1 and the stirrup 2, a hole wall 13 at the edge of the concrete 14, a concrete casing 3 fixedly connected to the outer side of the stirrup 2, a protection wire box 4 fixedly connected to the upper end of the concrete casing 3, an optical fiber stub 6 arranged inside the protection wire box 4, the concrete casing 3 including a circular casing 16, an optical fiber sensor 8 arranged at the center of the circular casing 16, a surrounding reinforcement 7 arranged inside the circular casing 16, a longitudinal reinforcement 9 arranged inside the surrounding reinforcement 7, a transverse connection reinforcement 10 arranged inside the surrounding reinforcement 7, two ends of the transverse connection reinforcement 10 respectively fixedly connected to the longitudinal reinforcement 9 and the optical fiber sensor 8, concrete 14 is poured inside the circular pile casing 16, and a plurality of annular fixing belts 11 are sleeved outside the circular pile casing 16.

Referring to fig. 2, the two ends of the main reinforcement 1 are fixedly connected with i-beams 15, the i-beams 15 are in contact with the concrete 14, and the i-beams 15 are used for connecting the underground continuous wall.

Referring to fig. 1, two lifting rings 5 are fixedly connected to the upper end of a main reinforcement 1, the two lifting rings 5 are symmetrically distributed on the main reinforcement 1, and the lifting rings 5 are used for being connected with a lifting hook when a reinforcement cage is transported.

Referring to fig. 3, the circular casing 16 is made of two semi-circular rigid materials, and a plurality of annular fixing bands 11 are uniformly distributed on the outer side of the circular casing 16. The annular fixing band 11 is used for fixing the circular pile casing 16, and when the concrete 14 meets the strength requirement, the circular pile casing 16 is convenient to disassemble.

Referring to fig. 4, the concrete 14 is wrapped with a surrounding rib 7, an optical fiber sensor 8, a longitudinal rib 9 and a transverse connecting rib 10, and the transverse connecting rib 10 is in a cross shape. Which functions to fix the optical fiber sensor 8.

Referring to fig. 3, the top end of the optical fiber sensor 8 passes through the protection wire box 4 to be fixedly connected with the optical fiber stub 6, the top of the protection wire box 4 is hinged with a box cover, the optical fiber stub 6 is used for connecting the optical fiber sensor 8 with equipment, the protection wire box 4 has opening and closing functions, and the optical fiber stub 6 is placed in the protection wire box 4 to prevent the optical fiber stub from being damaged when concrete is poured.

The utility model discloses the concrete implementation process as follows: during construction, the lifting hook of the crane is fixed on the lifting ring 5, then a steel reinforcement cage composed of the main reinforcement 1 and the stirrups 2 is hoisted to a preset position of the underground continuous wall, then the concrete sleeve 3 is installed on the outer side of the steel reinforcement cage, concrete 14 is poured into the steel reinforcement cage, when pouring is carried out, the optical fiber cable head 6 is located inside the protection cable box 4, so that damage of the protection cable box can be avoided, when concrete 14 is poured into the circular protection tube 16, the optical fiber sensor 8 is fixed on the inner side through the longitudinal reinforcement 9 and the transverse connecting reinforcement 10, the position of the optical fiber sensor can be prevented from being deviated, data is inaccurate, after the concrete 14 reaches a certain strength, the circular protection tube 16 can be separated after the annular fixing band 11 is detached, setting of a detection point can be completed, and the position can be monitored through the optical fiber sensor 8 after the setting is completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An optical fiber protection monitoring device for an underground diaphragm wall comprises a main rib (1), and is characterized in that: the concrete protective sleeve is characterized in that a stirrup (2) is fixedly connected to the outer side of the main reinforcement (1), a connecting reinforcement (12) is fixedly connected to the inner part of the main reinforcement (1), concrete (14) is filled around the main reinforcement (1) and the stirrup (2), the edge of the concrete (14) is a hole wall (13), a concrete protective sleeve (3) is fixedly connected to the outer side of the stirrup (2), a protective wire box (4) is fixedly connected to the upper end of the concrete protective sleeve (3), an optical fiber wire head (6) is arranged inside the protective wire box (4), the concrete protective sleeve (3) comprises a circular protective sleeve (16), an optical fiber sensor (8) is arranged at the center of the inner part of the circular protective sleeve (16), a surrounding reinforcement (7) is arranged inside the surrounding reinforcement (7), a longitudinal reinforcement (9) is arranged inside the surrounding reinforcement (7), and a transverse connecting reinforcement (10) is arranged inside the surrounding reinforcement (7), the two ends of the transverse connecting rib (10) are fixedly connected with the longitudinal rib (9) and the optical fiber sensor (8) respectively, concrete (14) is poured inside the circular pile casing (16), and a plurality of annular fixing bands (11) are sleeved on the outer side of the circular pile casing (16).

2. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the two ends of the main rib (1) are fixedly connected with I-shaped steel (15), and the I-shaped steel (15) is in contact with the concrete (14).

3. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the upper end of the main rib (1) is fixedly connected with two hanging rings (5), and the two hanging rings (5) are symmetrically distributed on the main rib (1).

4. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the circular pile casing (16) is made of two semi-circular rigid materials, and the annular fixing bands (11) are uniformly distributed on the outer side of the circular pile casing (16).

5. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the concrete (14) is wrapped by a surrounding rib (7), an optical fiber sensor (8), a longitudinal rib (9) and a transverse connecting rib (10), and the transverse connecting rib (10) is in a cross shape.

6. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the top of optical fiber sensor (8) passes protection line box (4) and optical fiber end of a thread (6) fixed connection, the top of protection line box (4) articulates there is the lid.

7. An optical fiber protection monitoring device for underground continuous walls according to claim 1, characterized in that: the concrete casing (3) is U-shaped and two hoops (2) are arranged on the concrete casing.