CN218373892U - Distributed monitoring device for foundation pit anchor rod - Google Patents
Distributed monitoring device for foundation pit anchor rod Download PDFInfo
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- CN218373892U CN218373892U CN202221704936.9U CN202221704936U CN218373892U CN 218373892 U CN218373892 U CN 218373892U CN 202221704936 U CN202221704936 U CN 202221704936U CN 218373892 U CN218373892 U CN 218373892U
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Abstract
The utility model discloses a distributed monitoring device of foundation pit anchor rod, which comprises a first anchor rod and a second anchor rod, wherein the outer wall where the first anchor rod is positioned is provided with a sensing optical cable arranged along the axis direction, one end part of the sensing optical cable is connected to a control center, and the other end part of the sensing optical cable is led out from the tail part of the first anchor rod to the head part along the axis outer wall and then is led out reversely; two groups of expanders are arranged at the front end part where the second anchor rod is located, and meanwhile, the expanders expand outwards and expand and reinforce rock and soil mass on the inner wall of a drilled hole, and the sensing optical cable led out from the first anchor rod is led out to the head part along the outer wall of the axis from the tail part of the second anchor rod and then led out reversely; the first anchor rod and the second anchor rod are horizontally arranged in horizontal drill holes of different depth stratums of the foundation pit from top to bottom. The stress strain of each point along the sensing optical cable can be obtained, the full-distributed monitoring of the stress deformation of the anchor rod is realized, the defects of omission and multiple leads of the traditional point type monitoring are overcome, and the monitoring efficiency is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of the foundation ditch monitoring, concretely relates to distributed monitoring devices of foundation ditch stock.
Background
With the acceleration of the urbanization process, a large number of high-rise buildings are continuously built, the depth of the foundation pit is continuously increased, the scale is continuously increased, and accordingly the requirement on the stability of the foundation pit engineering is higher and higher. The anchor rod is used as a main means of foundation pit support, has the advantages of light structure, strong flexibility, good ductility, low manufacturing cost, simple and convenient construction, strong adaptability, short construction period, small environmental influence and the like, and is widely applied to foundation pit support.
During construction of deep foundation engineering, soil unloading in the foundation engineering can cause rebound of a foundation along with excavation; the soil retaining structure interacts with the soil around the foundation engineering, and if the supporting structure is unreasonably designed, the rigidity and the strength are insufficient, so that the supporting structure is inclined, even the soil slides, the foundation engineering collapses and other accidents are caused; meanwhile, engineering geological problems caused in the precipitation process of foundation engineering construction are frequent, for example, the soil body is consolidated to cause uneven ground settlement of peripheral soil bodies, so that ground crack disasters are seriously brought, and sand losses and piping sand flowing accidents and the like are caused by pumping water in sandy soil strata.
The anchor rod is used as a main means of foundation support, has the advantages of light structure, strong flexibility, good ductility, low manufacturing cost, simple and convenient construction, strong adaptability, short construction period, small influence on environment and the like, and is widely applied to foundation support, so that the evaluation of the working performance and the long-term reinforcement effect of the anchor rod in foundation engineering support is very important. Therefore, corresponding technical means are needed to monitor and monitor the stress-strain change of the anchor rod in the process of foundation engineering support.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims to provide a distributed monitoring devices of foundation ditch stock has solved the above-mentioned technical problem who exists among the prior art.
The purpose of the utility model can be realized by the following technical scheme:
a distributed monitoring device for foundation pit anchor rods comprises a first anchor rod and a second anchor rod, wherein the first anchor rod is of a straight pipe-shaped structure, a sensing optical cable arranged along the axis direction is arranged on the outer wall where the first anchor rod is located, one end of the sensing optical cable is connected to a control center, and the other end of the sensing optical cable is led out from the tail of the first anchor rod to the head along the outer wall of the axis and then led out reversely;
the front end part of the second anchor rod is provided with two groups of expanders, and simultaneously, the expanders expand outwards and expand and reinforce rock and soil mass on the inner wall of the drilled hole, so that the anchoring performance of the anchor rod is improved, and the sensing optical cable led out from the first anchor rod is led out from the tail part of the second anchor rod to the head part along the outer wall of the axis and then led out reversely;
and the first anchor rod and the second anchor rod are horizontally arranged in horizontal drilling holes of strata with different depths of the foundation pit from top to bottom.
Furthermore, the first anchor rod and the second anchor rod are distributed and connected in a multi-section tubular shape and are connected with each other through flange pieces.
Furthermore, the outer wall of the first anchor rod and the outer wall of the second anchor rod are provided with two sets of steel bar pieces along the direction of the symmetry axis, and meanwhile, the sensing optical cable is arranged in the gap between the steel bar pieces and the outer walls of the first anchor rod and the second anchor rod.
Further, the outer walls where the first anchor rod and the second anchor rod are located are wrapped with resin coating films, so that the sensing optical cable is wrapped on the outer walls where the first anchor rod and the second anchor rod are located; and a cloth-based adhesive tape is arranged on the outer side of the resin coating film layer.
Furthermore, the sensing optical cable led out of the first anchor rod is connected with the sensing optical cable led in the second anchor rod in a fusion mode.
The utility model has the advantages that:
1. the sensing optical cable on the first stock that this device adopted and the second stock measures the condition in the different degree of depth boreholes simultaneously to adopt the butt fusion mode to realize the continuity of sensing optical cable sensing data, improve the monitoring precision.
2. Compared with the traditional point type sensor, the distributed optical fiber sensing technology has the most obvious advantages that the stress strain of each point along the sensing optical fiber can be measured, the full-distributed monitoring of the stress deformation of the anchor rod is realized, the defects of omission and multiple leads of the traditional point type monitoring are overcome, and the monitoring efficiency is greatly improved.
3. The sensing optical cable adopted by the device is light in weight and small in size, is easy to arrange and install on the anchor rod, and can obtain reliable monitoring data for evaluating the safety and stability of basic engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;
fig. 2 is a schematic view of the overall structure of a first anchor rod according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structural view of a first anchor rod according to an embodiment of the present invention;
fig. 4 is a schematic view of the overall structure of the second anchor rod according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a distributed monitoring device for foundation pit anchor rods, including a first anchor rod 1 and a second anchor rod 2, as shown in fig. 2 and 3, the first anchor rod 1 is a straight tubular structure, and a sensing optical cable 3 arranged along the axis direction is provided on the outer wall where the first anchor rod 1 is located, one end of the sensing optical cable 3 is connected to a control center, and the other end is led out from the tail of the first anchor rod 1 along the axis outer wall to the head and then led out along the symmetry axis outer wall in a reverse direction; the first anchor rods 1 are connected in a multi-section tubular arrangement and are connected to each other by the flange members 101. And the outer wall at first stock 1 place sets up two sets of steel bar spare 102 of symmetry along the axis direction, sensing optical cable 3 is located the clearance of steel bar spare 102 with first stock 1 and lays, sensing optical cable 3 avoids receiving the extrusion damage this moment, the outer wall parcel at first stock 1 place has resin coating tectorial membrane layer 11 afterwards, make sensing optical cable 3 wrapped up in the outer wall at first stock 1 place, rethread cloth base sticky tape 12 carries out the secondary parcel to steel bar spare 102 and the 3 outer walls of sensing optical cable that 11 parcels of resin coating tectorial membrane layer, can reduce the stock and impel the frictional damage of drilling in-process pore wall to 3 surperficial sensing optical cable, the survival rate of sensing optical cable 3 has been improved, and guarantee its coupling performance with the stock.
As shown in fig. 4, two sets of expanders 21 are disposed at the front end of the second anchor rod 2 (connected in a multi-section tubular distribution manner as required and interconnected by a flange member 101), and simultaneously, the expanders 21 expand outwards and expand and reinforce the rock-soil body of the inner wall of the drilled hole (applicable to soft soil layers), thereby improving the anchoring performance of the anchor rod, the sensing optical cable 3 led out from the first anchor rod 1 is led out from the tail of the second anchor rod 2 to the head along the outer wall of the axis and then led out along the outer wall of the axis in a reverse direction, at this time, two sets of symmetrical reinforcing steel bar members 102 are disposed on the outer wall of the second anchor rod 2 along the axis direction, so that the sensing optical cable 3 is disposed in the gap between the reinforcing steel bar members 102 and the outer wall of the second anchor rod 2, at this time, the sensing optical cable 3 is prevented from being damaged by friction, and then the outer wall of the second anchor rod 2 is wrapped with a resin-coated film layer 11 (not specifically shown in the figure, see the similar arrangement of the first anchor rod 1), so that the sensing optical cable 3 is wrapped on the outer wall of the first anchor rod 1, and the sensing optical cable 3 is capable of reducing the damage caused by the coupling of the sensing optical cable, and the sensing optical cable 3, see that the survival rate of the sensing optical cable 3 is reduced by the coupling of the sensing optical cable 3 and the sensing optical cable 3.
The sensing optical cable 3 led out from the first anchor rod 1 is connected with the sensing optical cable 3 led in from the second anchor rod 2 in a welding mode. The first anchor rod 1 and the second anchor rod 2 are horizontally arranged in drill holes of different depth stratums of the foundation pit from top to bottom.
The specific using method comprises the following steps: (1) And horizontally pressing the anchor rod attached with the strain sensing optical cable into a horizontal borehole constructed in advance by using a horizontal pushing machine.
(2) And selecting a grouting material which is matched according to the design requirement for grouting.
(3) And (5) installing the counterforce device and the drawing test related equipment when the grouting strength meets the standard requirement.
(4) Generally, a cyclic loading method is adopted for loading, and after each loading, optical fiber data acquisition is carried out after the load is stabilized until the whole loading test is finished.
And carrying out fully distributed monitoring by utilizing the linear relation between the variation of the spontaneous Brillouin scattering frequency in the optical fiber and the strain variation. Compared with the traditional point type sensor, the distributed optical fiber sensing technology has the most obvious advantages that the stress strain of each point along the sensing optical fiber can be measured, the full-distributed monitoring of the monitored object is realized, the defects of missing detection and multiple leads of the traditional point type monitoring are overcome, and the monitoring efficiency is greatly improved. Meanwhile, the optical fiber is light in weight, small in size and easy to arrange and install on the anchor rod. Therefore, the distributed anchor rod for supporting and monitoring the deep foundation engineering is provided by the scheme, and monitoring evaluation is carried out on the safety and the stability of the foundation engineering.
After the installation is completed, the control center adopts a distributed data acquisition system to acquire data in the drilled hole through the sensing optical cables 3 positioned on the first anchor rod 1 and the second anchor rod 2.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.
Claims (4)
1. A distributed monitoring device for foundation pit anchor rods comprises a first anchor rod (1) and a second anchor rod (2), and is characterized in that the first anchor rod (1) is of a straight pipe-shaped structure, a sensing optical cable (3) arranged along the axis direction is arranged on the outer wall where the first anchor rod (1) is located, one end of the sensing optical cable (3) is connected to a control center, and the other end of the sensing optical cable is led out from the tail of the first anchor rod (1) to the head along the outer wall of the axis and then led out reversely;
two groups of expanders (21) are arranged at the front end part of the second anchor rod (2), and meanwhile, the expanders (21) are used for expanding outwards and expanding and reinforcing rock and soil mass on the inner wall of a drilled hole, and the sensing optical cable (3) led out from the first anchor rod (1) is led out from the tail part of the second anchor rod (2) to the head part along the outer wall of the axis and then led out reversely;
the first anchor rod (1) and the second anchor rod (2) are transversely arranged in horizontal drill holes of strata at different depths of the foundation pit;
the first anchor rod (1) and the second anchor rod (2) are distributed and connected in a multi-section tubular mode and are connected with each other through flange pieces (101).
2. The distributed monitoring device for the foundation pit anchor rods according to claim 1, wherein two sets of steel bar members (102) are arranged on the outer wall of the first anchor rod (1) and the outer wall of the second anchor rod (2) along the axis direction of the symmetry axis, and the sensing optical cable (3) is arranged in a gap between the steel bar members (102) and the outer walls of the first anchor rod (1) and the second anchor rod (2).
3. The distributed monitoring device for the foundation pit anchor rods is characterized in that the outer walls of the first anchor rods (1) and the second anchor rods (2) are wrapped with resin coating films (11), so that the sensing optical cables (3) are wrapped on the outer walls of the first anchor rods (1) and the second anchor rods (2); and a cloth-based adhesive tape (12) is arranged on the outer side of the resin coating layer (11).
4. A distributed monitoring apparatus for foundation pit anchoring rods according to claim 3, characterized in that the sensing optical cable (3) led out from the first anchoring rod (1) is connected with the sensing optical cable (3) led in from the second anchoring rod (2) by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221704936.9U CN218373892U (en) | 2022-07-04 | 2022-07-04 | Distributed monitoring device for foundation pit anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221704936.9U CN218373892U (en) | 2022-07-04 | 2022-07-04 | Distributed monitoring device for foundation pit anchor rod |
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| Publication Number | Publication Date |
|---|---|
| CN218373892U true CN218373892U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221704936.9U Active CN218373892U (en) | 2022-07-04 | 2022-07-04 | Distributed monitoring device for foundation pit anchor rod |
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| CN (1) | CN218373892U (en) |
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2022
- 2022-07-04 CN CN202221704936.9U patent/CN218373892U/en active Active
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