A folding convergence monitoring pile and cavern surrounding rock monitoring system

Abstract

This invention provides a foldable convergence measuring pile and cavern surrounding rock monitoring system. The foldable convergence measuring pile includes an anchor rod and a probe. One end of the anchor rod has a first hinge lug. The probe includes a connecting rod, a reflective sheet attached to one side of the connecting rod, and a second hinge lug connected to the connecting rod. The second hinge lug is connected to the anchor rod via a pin. The hinged connecting rod forms a first position and a second position. In the first position, the connecting rod is flush with the anchor rod. In the second position, the angle between the connecting rod and the anchor rod is less than or equal to 90°. The probe of this invention is hinged to the anchor rod. During observation, the probe is opened; after observation, the probe can be rotated to fold, thus significantly reducing the probability of damage to the convergence measuring point (probe) during construction, reducing the need for repeated deployment of convergence measuring points, and improving work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cavern surrounding rock deformation monitoring technology, and in particular to a foldable convergent measuring pile and cavern surrounding rock monitoring system. Background Technology

[0002] During the excavation and construction of large caverns such as underground powerhouses and tunnels, convergence measurements of the surrounding rock are necessary to monitor its deformation. Convergence measurements are an essential part of safety monitoring during underground cavern construction. Total station measurements are commonly used, offering advantages such as fast observation speed, high accuracy, and no limitations imposed by tunnel height.

[0003] The total station surveying method requires the arrangement of multiple convergent measuring points along the tunnel cross-section. For example, reflecting prisms or reflectors are pre-installed at the points to be measured. A survey line is formed between every two measuring points in the cross-section. The coordinates of the measuring points are measured using a total station, and the distance between the points is calculated. The relative displacement of the two measuring points at different times is then converted into the difference in distance values, yielding the change in distance between the measured locations.

[0004] However, the convergence measuring points protrude from the rock wall, and in the complex construction environment of the tunnel, they are easily affected by on-site blasting, construction vehicles, etc., which often leads to damage to the measuring points and the need to re-bury them. This not only increases costs but also causes discontinuity in monitoring data. Utility Model Content

[0005] The purpose of this invention is to provide a foldable convergent measuring pile and cavern surrounding rock monitoring system to reduce the damage rate of measuring points and ensure the continuity of monitoring data.

[0006] The technical solution of this utility model is: a foldable convergent probing pile, including an anchor rod and a probe. One end of the anchor rod is provided with a first hinge lug. The probe includes a connecting rod, a reflective sheet attached to one side surface of the connecting rod, and a second hinge lug connected to the connecting rod. The second hinge lug is connected to the first hinge lug and hinged by a pin. The hinged connecting rod forms a first position and a second position. In the first position, the connecting rod is flush with the anchor rod. In the second position, the included angle between the connecting rod and the anchor rod is less than or equal to 90°.

[0007] In the above scheme, the probe is connected to the anchor rod in a hinged manner. The probe can be opened during observation and folded after observation, thereby greatly reducing the probability of damage to the convergence measurement point (probe) during construction, reducing the repeated deployment of convergence measurement points, and improving work efficiency.

[0008] Preferably, the reflective sheet is a sheet-like body, with multiple circles concentric on one side surface, the centers of which form a monitoring reference point.

[0009] Preferably, the side surface of the reflector is further provided with crosshairs, and the intersection of the crosshairs coincides with the monitoring reference point.

[0010] Preferably, the first hinge ear and the second hinge ear are disposed on the side surface away from the reflector, and in the first position, the end face of the anchor rod is fitted and limited to the end face of the connecting rod.

[0011] Preferably, the anchor rod is a metal part, and the probe is a PVC part.

[0012] This utility model also provides a cavern surrounding rock monitoring system, including a rock mass and the aforementioned foldable convergent measuring pile. Anchor holes are provided on the rock mass, and the anchor rod of the foldable convergent measuring pile is inserted into the anchor hole. The measuring head of the foldable convergent measuring pile extends to the outside of the anchor hole.

[0013] Preferably, the anchor hole is filled with epoxy resin adhesive for fixing the anchor rod.

[0014] Preferably, at least one anchor hole is arranged at the top and both sides of the rock mass section, and a folded convergence measuring pile is installed in each anchor hole.

[0015] Preferably, the first hinge lug on the anchor rod extends outside the anchor hole.

[0016] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0017] I. The probe provided by this utility model is connected to the anchor rod in a hinged manner. The probe can be opened during observation and can be rotated and folded after observation, thereby greatly reducing the probability of damage to the convergence measuring point (probe) during construction, reducing the repeated deployment of convergence measuring points, and improving work efficiency.

[0018] Second, the probe and the anchor rod are detachably hinged by a pin. When the probe is damaged due to blasting construction or other reasons, it can be removed and replaced, which is convenient and quick and ensures the continuity of monitoring data.

[0019] Third, the first hinge ear and the second hinge ear are disposed on the side surface away from the reflector. This allows the rotational opening position of the connecting rod and the reflector on it to be limited by the end face of the anchor rod being in contact with the end face of the connecting rod, thus avoiding excessive rotation of the reflector and resulting in deviation of the measuring point position.

[0020] Fourth, it has a simple structure, is easy to install, can be reused, and saves costs. Attached Figure Description

[0021] Figure 1 A first-view structural schematic diagram of the foldable convergence measuring pile provided by this utility model;

[0022] Figure 2 A schematic diagram of the second perspective of the foldable convergence measuring pile provided by this utility model;

[0023] Figure 3 A schematic diagram of the structure of the cavern surrounding rock monitoring system provided by this utility model.

[0024] In the attached diagram: 1. Anchor rod; 11. First hinge lug; 2. Probe; 21. Second hinge lug; 22. Connecting rod; 23. Reflector; 3. Epoxy resin adhesive; 4. Rock mass; 41. Anchor hole; 5. Pin. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0026] like Figure 1 , Figure 2 As shown, the folding convergence pile provided in this embodiment includes an anchor rod 1, a probe 2, and a pin 5. The anchor rod 1 is supported by metal material, and one end of it is provided with a first hinge lug 11.

[0027] The probe 2 is made of PVC material and includes a connecting rod 22, a reflective sheet 23 attached to one side surface of the connecting rod 22, and a second hinge lug 21 connected to the connecting rod 22. The first hinge lug 11 and the second hinge lug 21 are located on the side surface away from the reflective sheet 23. The first hinge lug 11 and the second hinge lug 21 are mated and detachably hinged by a pin 5. The hinged connecting rod 22 forms a first position and a second position.

[0028] In the first position, the connecting rod 22 is flush with the anchor rod 1, and the end face of the anchor rod 1 is in contact with the end face of the connecting rod 22 to limit its rotation, preventing the probe 2 from rotating more than 180° and affecting the accuracy of its position after deployment. In the second position, the angle between the connecting rod 22 and the anchor rod 1 is less than or equal to 90°, at which point the connecting rod 22 is in contact with the rock mass 4. The hinged probe 2 can be deployed or folded, facilitating quick resumption of observation after deployment and preventing damage to the probe 2 from external factors after folding.

[0029] like Figure 3 As shown, the reflector 23 is a sheet-like body with multiple concentric circles and crosshairs on its surface away from the connecting rod 22. The centers of the multiple circles form a monitoring reference point 231, and the intersection of the crosshairs coincides with the monitoring reference point 231. The reflector 23 is an externally molded component.

[0030] like Figure 3 As shown, this utility model also provides a cavern surrounding rock monitoring system, including a rock mass 4 and the above-mentioned foldable convergent measuring pile. Anchor holes 41 are provided on the rock mass 4. The anchor rod 1 of the foldable convergent measuring pile is inserted into the anchor hole 41. The first hinge lug 11 and the measuring head 2 on the anchor rod 1 both extend to the outside of the anchor hole 41.

[0031] During the construction of a tunnel project, total station measurements were used to monitor tunnel convergence deformation. One convergence measuring point was placed at the top and two sides of the monitoring section along the tunnel, for a total of three measuring points per monitoring section. To more effectively protect the measuring points, convergence measuring stakes of this invention were installed on-site.

[0032] During on-site installation, holes are drilled along the monitoring section at the designed locations (top and waist of the cavern) to form anchor holes 41. Anchor rods 1 are installed in anchor holes 41, with the first hinge lug 11 on the anchor rod 1 extending to the outside of the anchor hole 41. Epoxy resin adhesive 3 is then injected into the anchor holes 41 for bonding. The outer surface of the epoxy resin adhesive 3 is flush with the outer surface of the rock mass 4, exposing the first hinge lug 11.

[0033] Align the second hinge ear 21 of the probe 2 with the hole of the first hinge ear 11, and then connect them through the pin 5. When measurement is required, unfold the probe 2 to the first position, with the end face of the anchor rod 1 and the end face of the connecting rod 22 in contact and limiting, and the reflector 23 placed at the measurement point. After the measurement is completed, fold the probe 2 and rotate it away from the reflector 23 until the connecting rod 22 is in contact with the rock mass 4. This effectively prevents the probe 2 from being damaged, thus ensuring the continuity of monitoring data. At the same time, since the material stiffness of the probe 2 and the anchor rod 1 differs greatly, when subjected to external impact or collision, only the probe 2 will be damaged, ensuring that the anchor rod 1 does not deform. Only the probe 2 needs to be replaced to restore the measurement point, which will save a lot of costs.

[0034] The convergence measuring stake of this invention allows for the folding of the measuring head when blasting or other construction work that may damage the measuring point is being carried out nearby. The head can be folded back up after the work is completed. If a measuring point is damaged, the convergence measuring stake can be easily restored in its original location by replacing the measuring head. This reduces the need for repeated deployment of convergence measuring stakes, saves costs, and ensures the continuity of monitoring data.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A folding convergence peg comprising an anchoring rod (1), characterized in that, It also includes a probe (2), one end of the anchor rod (1) is provided with a first hinge ear (11), the probe (2) includes a connecting rod (22), a reflective sheet (23) attached to one side surface of the connecting rod (22) and a second hinge ear (21) connected to the connecting rod (22), the first hinge ear (11) and the second hinge ear (21) are connected to each other and are detachably hinged by a pin (5), the hinged connecting rod (22) forms a first position and a second position, in the first position, the connecting rod (22) is flush with the anchor rod (1), in the second position, the included angle between the connecting rod (22) and the anchor rod (1) is less than or equal to 90°.

2. The folded convergence surveying stake according to claim 1, characterized in that, The reflective sheet (23) is a sheet-like body with multiple circles concentric on one side surface, and the centers of the multiple circles form a monitoring reference point (231).

3. The folding convergence measuring stake according to claim 2, characterized in that, The side surface of the reflector (23) is also provided with crosshairs, and the intersection of the crosshairs coincides with the monitoring reference point (231).

4. The folding convergence measuring stake according to claim 1, characterized in that, The first hinge ear (11) and the second hinge ear (21) are disposed on the side surface away from the reflector (23). In the first position, the end face of the anchor rod (1) is in contact with and limited by the end face of the connecting rod (22).

5. The folding convergence measuring stake according to claim 1, characterized in that, The anchor rod (1) is a metal part, and the probe (2) is a PVC material part.

6. A cavern surrounding rock monitoring system, comprising a rock mass (4), wherein the rock mass (4) is provided with anchor holes (41), characterized in that, It also includes a folding convergence test pile as described in any one of claims 1-5, wherein the anchor rod (1) of the folding convergence test pile is inserted into the anchor hole (41), and the probe (2) of the folding convergence test pile extends to the outside of the anchor hole (41).

7. The cavern surrounding rock monitoring system according to claim 6, characterized in that, The anchor hole (41) is filled with epoxy resin adhesive (3) for fixing the anchor rod (1).

8. The cavern surrounding rock monitoring system according to claim 6, characterized in that, At least one anchor hole (41) is arranged at the top and both sides of the cross section of the rock mass (4), and a folded convergence measuring pile is installed in each anchor hole (41).

9. The cavern surrounding rock monitoring system according to claim 6, characterized in that, The first hinge lug (11) on the anchor rod (1) extends to the outside of the anchor hole (41).

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