Omnibearing multi-point displacement meter for highway tunnel surrounding rock monitoring

Abstract

An omnibearing multi-point displacement meter for highway tunnel surrounding rock monitoring comprises a monitoring pile casing, a plurality of stay wire displacement sensors are arranged in the monitoring pile casing, the bottom of the monitoring pile casing is connected with a transition pipe, and the lower end of the transition pipe is provided with measuring wire protection pipes facing multiple directions. And a steel stranded measuring wire of the stay wire displacement sensor penetrates out of the lower end of the transition pipe and the measuring wire protection pipe after penetrating through the transition pipe. The device can monitor deformation and damage of the surrounding rock body in all directions through the measuring line protection pipes which are arranged in a cross mode, on one hand, the using amount of displacement meter devices is reduced, monitoring cost is saved, on the other hand, the number of drill holes is reduced, disturbance to excavated surrounding rock is small, and monitored data are more accurate and reliable. A fixed pulley device is arranged at the turning position of the steel strand in the device, friction of the device to the steel strand is reduced, and monitoring data are more accurate. The device can set the tightening degree and length of the steel strand according to actual requirements, so that the device is suitable for monitoring the deep deformation of the surrounding rock of the highway tunnel.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement detection, in particular to an all-round multi-point displacement meter for monitoring surrounding rocks of highway tunnels. Background Technique

[0002] At present, most highway tunnels are constructed by the "New Austrian Tunneling Method", which requires a large amount of monitoring and measurement of surrounding rocks to guide the construction. Therefore, the monitoring and measurement of surrounding rocks are crucial for the construction of highway tunnels.

[0003] Among the monitoring and measurement contents of tunnel surrounding rocks, the displacement measurement before and after the excavation of surrounding rocks intuitively reflects the influence of excavation disturbance on the stability of surrounding rocks, and at the same time intuitively verifies the reliability and safety of the support system, which is an important step in the construction of highway tunnels by the "New Austrian Tunneling Method".

[0004] At present, the main instruments for measuring the displacement of tunnel surrounding rocks are various single-point and multi-point displacement meters. The displacement inside the surrounding rock drives the anchor head, and then is transmitted to the vibrating wire displacement meter through the measuring rod to achieve the work. The structure of this kind of displacement meter device is simple and easy to install. However, it also has the disadvantages of few measuring points and small measuring range for a single device. Moreover, most displacement meter devices can only monitor the displacement in one direction at a time. If it is necessary to monitor the displacement and deformation of the rock mass in multiple directions, multiple drill holes and multiple displacement meter devices need to work, which increases the cost and workload. At the same time, due to the sequence of instrument operation time, multiple drill holes cause great disturbance to the surrounding rock, resulting in inaccurate monitoring data. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an all-round multi-point displacement meter for monitoring surrounding rocks of highway tunnels, which can monitor the failure and deformation of the rock mass in all directions, has sufficient measuring points, reduces the number of drill holes, and the monitoring data is accurate and reliable.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is: an all-round multi-point displacement meter for monitoring surrounding rocks of highway tunnels, including a monitoring protection cylinder, in which a plurality of wire-pulling displacement sensors are arranged. A transition pipe is connected to the bottom of the monitoring protection cylinder, and at the lower end of the transition pipe, there are measuring line protection pipes facing multiple directions. The steel wire measuring lines of the wire-pulling displacement sensors pass through the transition pipe and then pass out from the lower end of the transition pipe and the measuring line protection pipes.

[0007] Preferably, there are four measuring line protection pipes, which face four directions respectively. There are five wire-pulling displacement sensors, which are respectively used to detect the displacements in four directions and the displacement below.

[0008] Preferably, the wire-pulling displacement sensors are arranged at the bottom of the top plate of the protection cylinder.

[0009] Preferably, an anchor head is arranged at the end of the steel wire measuring line.

[0010] Preferably, a fixed pulley for guiding the steel strand measuring line to turn is provided in the monitoring casing and the measuring line protection pipe.

[0011] Preferably, a measuring line adjuster is provided below the wire-pulling displacement sensor, and the steel strand measuring line is connected to the measuring line adjuster.

[0012] The utility model provides an all-round multi-point displacement meter for highway tunnel surrounding rock monitoring. The cross-arranged measuring line protection pipes enable the device to monitor the deformation and failure of the surrounding rock mass in all directions. On the one hand, the usage amount of the displacement meter device is reduced, and the monitoring cost is saved. On the other hand, the number of drill holes is reduced, the disturbance to the excavated surrounding rock is small, and the monitored data is more accurate and reliable. A fixed pulley device is arranged at the turning point of the steel strand measuring line inside the device, reducing the friction of the device on the steel strand measuring line and making the monitoring data more accurate. The device can set the length of the steel strand measuring line according to actual needs, making the device suitable for monitoring the deep deformation of highway tunnel surrounding rock. Description of the Drawings

[0013] The following further describes the utility model with reference to the drawings and embodiments:

[0014] Figure 1 It is a schematic structural diagram of the device of the utility model;

[0015] Figure 2 It is a schematic structural diagram of the monitoring casing of the device;

[0016] Figure 3 It is a schematic structural diagram of the measuring line protection pipe of the device. Detailed Embodiments

[0017] As Figures 1-3 shown, an all-round multi-point displacement meter for highway tunnel surrounding rock monitoring includes a monitoring casing 1. A plurality of wire-pulling displacement sensors 6 are arranged in the monitoring casing 1. A transition pipe 2 is connected to the bottom of the monitoring casing 1. Measuring line protection pipes 3 facing multiple directions are arranged at the lower end of the transition pipe 2. The steel strand measuring lines 8 of the wire-pulling displacement sensors 6 pass through the transition pipe 2 and then pass out from the lower end of the transition pipe 2 and the measuring line protection pipes 3.

[0018] Preferably, there are four measuring line protection pipes 3, which are respectively oriented in four directions. There are five wire-pulling displacement sensors 6, which are respectively used to detect the displacements in four directions and the displacement below.

[0019] Preferably, the wire-pulling displacement sensor 6 is arranged at the bottom of the casing top plate 5.

[0020] Preferably, an anchor head 4 is provided at the end of the steel strand measuring line 8.

[0021] Preferably, a fixed pulley 9 for guiding the steel strand measuring line 8 to turn is provided in the monitoring casing 1 and the measuring line protection pipe 3.

[0022] Preferably, a wire measuring regulator 7 is provided below the wire displacement sensor 6, and the stranded wire 8 is connected to the wire measuring regulator 7.

[0023] In use, the anchor heads 4 in all directions are anchored inside the tunnel surrounding rock mass through a cementing material. When the tunnel surrounding rock mass deforms and generates displacement, it drives the anchor head 4 to move. The anchor head 4 drives the stranded wire 8, and the stranded wire 8 transmits the displacement to the displacement sensor 6 inside the monitoring protection cylinder 1 under the protection of the wire protection pipe 3 and the guidance of the fixed pulley device 9.

[0024] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An all-round multi-point displacement meter for surrounding rock monitoring of highway tunnels, characterized in that: It includes a monitoring casing (1). Inside the monitoring casing (1), there are multiple wire-pulling displacement sensors (6). At the bottom of the monitoring casing (1), a transition pipe (2) is connected. At the lower end of the transition pipe (2), there are wire protection pipes (3) facing multiple directions. The steel strand measuring wires (8) of the wire-pulling displacement sensors (6) pass through the transition pipe (2) and then pass out from the lower end of the transition pipe (2) and the wire protection pipes (3).

2. The omnidirectional multi-point displacement meter for monitoring surrounding rock of highway tunnels according to claim 1, characterized in that: There are four said wire protection pipes (3), facing four directions respectively. There are five said wire-pulling displacement sensors (6), which are respectively used to detect displacements in four directions and the displacement below.

3. The omnidirectional multi-point displacement meter for surrounding rock monitoring of highway tunnels according to claim 1, characterized in that: The said wire-pulling displacement sensors (6) are arranged at the bottom of the casing top plate (5).

4. The omnidirectional multi-point displacement meter for surrounding rock monitoring of highway tunnels according to claim 1, wherein: An anchor head (4) is provided at the end of the said steel strand measuring wire (8).

5. The omnidirectional multi-point displacement meter for surrounding rock monitoring of highway tunnels according to claim 1, characterized in that: Fixed pulleys (9) for the steel strand measuring wire (8) to turn are provided inside the said monitoring casing (1) and the wire protection pipes (3).

6. The omnidirectional multi-point displacement meter for surrounding rock monitoring of a highway tunnel according to claim 1, wherein: A wire measuring regulator (7) is provided below the said wire-pulling displacement sensor (6), and the steel strand measuring wire (8) is connected to the wire measuring regulator (7).

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