Tunnel surrounding rock fissure water pressure measuring device

Abstract

The present invention relates to the field of tunnel surrounding rock construction equipment, and in particular to a tunnel surrounding rock fissure water pressure measuring device which is simple to manufacture and easy to install, thereby realizing convenient and reliable measurement of tunnel surrounding rock fissure water pressure, comprising a measuring tube, one end of which is provided with a water inlet, the measuring tube is connected to a water pressure gauge, at least one water plug is provided on the outer wall of the measuring tube, the water plug is provided between the water inlet and the water pressure gauge, and the measuring tube is connected to a gate valve. This fissure water pressure measuring device can be manufactured on-site or in a centralized manner in a factory, and is easy to obtain materials, simple to manufacture, and easy to install. Therefore, the fissure water pressure of the tunnel face can be measured under difficult conditions. The present invention is particularly suitable for measuring the fissure water pressure of tunnel surrounding rock.

Description

Technical Field

[0001] The invention relates to the field of tunnel surrounding rock construction equipment, in particular to a tunnel surrounding rock fissure water pressure measuring device. Background Art

[0002] The water-rich section of the tunnel needs to be drilled with advanced water exploration holes, and the type of tunnel lining is adjusted on site according to the water flow size and dynamic water pressure in the water exploration holes. Although there are electronic water pressure measuring devices that can monitor water pressure in real time, since there is no network signal in most tunnels and the face is changing at any time, electronic water pressure monitoring devices have not been widely used in tunnels. Therefore, in actual operation, water pressure is mostly measured by traditional water pressure measurement methods to provide relevant data to the design unit and determine the treatment plan. However, the existing fissure water pressure measurement device has a complex structure and is prone to various faults in harsh environments, resulting in measurement failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a tunnel surrounding rock fissure water pressure measuring device which is simple to manufacture and easy to install, thereby realizing convenient and reliable measurement of tunnel surrounding rock fissure water pressure.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a tunnel surrounding rock fissure water pressure measuring device comprises a measuring tube, one end of which is provided with a water inlet, the measuring tube is connected to a water pressure gauge, at least one water blocking plug is provided on the outer tube wall of the measuring tube, the water blocking plug is arranged between the water inlet and the water pressure gauge, and the measuring tube is connected to a gate valve.

[0005] Furthermore, the cross-section of the water shutoff plug is conical, wherein the conical tip of the water shutoff plug faces the water inlet.

[0006] Furthermore, the water blocking plug includes a first water blocking plug and a second water blocking plug, the first water blocking plug is arranged between the water inlet and the second water blocking plug, and the first inclined surface angle of the first water blocking plug is smaller than the second inclined surface angle of the second water blocking plug.

[0007] Furthermore, a stiffening ring is arranged inside the water blocking plug, and the stiffening ring extends outward in a direction perpendicular to the axis of the measuring tube.

[0008] Furthermore, it comprises a water pressure gauge hole on the measuring tube connected to the water pressure gauge, and a gate valve hole on the measuring tube connected to the gate valve, and the water pressure gauge hole and the gate valve hole are coaxially arranged.

[0009] Furthermore, a plug steel plate is provided at the other end of the measuring tube.

[0010] The beneficial effects of the present invention are as follows: the fissure water pressure measuring device can be manufactured on site or in a centralized factory, and is easy to obtain materials, simple to manufacture, and convenient to install. Therefore, the fissure water pressure of the tunnel face can be measured under difficult conditions. The present invention is particularly suitable for measuring the fissure water pressure of the tunnel surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention.

[0012] Marked in the figure are: measuring tube 1, second water plug 11, first water plug 12, stiffening ring 13, water inlet 14, gate valve 2, gate valve hole 21, plug steel plate 3, water pressure gauge 4, water pressure gauge hole 41, second inclined plane angle a, first inclined plane angle b. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 The water pressure measuring device for the fissure water in the surrounding rock of the tunnel shown comprises a measuring tube 1, one end of which is provided with a water inlet 14, the measuring tube 1 is connected with a water pressure gauge 4, at least one water plug is provided on the outer wall of the measuring tube 1, the water plug is provided between the water inlet 14 and the water pressure gauge 4, and the measuring tube 1 is connected with a gate valve 2. The technical advantages of this water pressure measuring device are: 1. It can measure the dynamic water pressure of the water-gushing tunnel and reflect the change of the water pressure of the fissure water in real time; 2. It solves the problem that there is no signal in the tunnel and the automatic water pressure monitoring device cannot be used; 3. It is simple and convenient to operate, and no professional personnel are required. Workers in the tunnel can operate it; 4. It can be used repeatedly, saving costs, and has practical significance and practical value. Its actual operation method is as follows: Step 1: After the water gushing occurs on the tunnel face, the face is closed, and a down-the-hole drill is used to drill an advance water exploration hole according to the requirements of the design drawings, and the drill bit diameter is not less than 90mm. Step 2: Open the gate valve of the water pressure measuring device to ensure that the water flow of the gate valve is smooth to reduce the resistance during the installation of the water pressure measuring device. Step 3: Aim the pipe mouth of the water pressure measuring device without the plugging plate at the water exploration hole of the tunnel face. When the water pressure is too high and manual installation is difficult, use a loader to support the tail end of the measuring pipe and push the water exploration hole of the face to ensure that the rubber water plugging ring is tightly plugged with the orifice, water flows out of the gate valve, and there is no water leakage from the orifice. Step 4: Open and close the gate valve three times in a row to observe the changes in the water pressure gauge. After confirming that the water pressure gauge is fault-free, close the gate valve and wait for 30 seconds to record the pressure of the water pressure gauge. Measure the orifice water pressure three times in a row and take the average value as the measured water pressure of the water exploration hole of the face. In actual production, the steel pipe can be directly used as the main body of the measuring pipe 1, and a plug steel plate 3 is set at the other end of the measuring pipe 1 to achieve closure, and the other end can be used as the water inlet 14.

[0015] In order to facilitate the embedding of the water plug into the water exploration hole and achieve the sealing of the water exploration hole, the cross-section of the water plug is preferably conical, wherein the conical tip of the water plug faces the direction of the water inlet 14. Further, the water plug preferably includes a first water plug 12 and a second water plug 11, wherein the first water plug 12 is arranged between the water inlet 14 and the second water plug 11, and the first inclined plane angle b of the first water plug 12 is smaller than the second inclined plane angle a of the second water plug 11. The above-mentioned first water plug 12 and second water plug 11 can achieve secondary sealing of the water exploration hole. Among them, in order to prevent the first water plug 12 from affecting the sealing effect of the subsequent second water plug 11, it is required that the first inclined plane angle b is smaller than the second inclined plane angle a, so as to facilitate the embedding of the water plug into the water exploration hole. In order to prevent the water plug from being crushed by the pressure of the water exploration hole when the water plug is inserted, a stiffening ring 13 is preferably provided inside the water plug, and the stiffening ring 13 extends outwardly in a direction perpendicular to the axis of the measuring tube 1 .

[0016] In actual arrangement, in order to allow the opening and closing of the gate valve 2 to timely adjust the pressure measured by the water pressure gauge 4, so as to more accurately and quickly implement multiple water pressure tests, thereby obtaining the average value of the water pressure, the following scheme is preferred: including a water pressure gauge hole 41 on the measuring tube 1 connected to the water pressure gauge 4, and a gate valve hole 21 on the measuring tube 1 connected to the gate valve 2, and the water pressure gauge hole 41 and the gate valve hole 21 are coaxially arranged.

[0017] The water pressure measuring device for the fissure water in the surrounding rock of the tunnel can be made in the following way: 1. The main pipe of the tunnel fissure water pressure measuring device adopts a φ89×6mm seamless steel pipe, which is about 3m long. 2. One end of the φ89×6mm seamless steel pipe is welded with a 12mm thick 140×140mm steel plate to seal it, ensuring that the weld is airtight and leak-proof. 3. Two circular holes are symmetrically opened about 20cm away from the sealing end of the main pipe, namely the water pressure gauge hole 41 and the gate valve hole 21. One is used as a connecting hole for connecting the water pressure gauge, with a hole diameter of about 20mm, and the other is used as a pressure relief hole for connecting the gate valve, with a hole diameter of not less than 60mm. 4. A 6mm thick stiffening ring is welded at the position of the rubber plug. The number of stiffening rings increases or decreases according to the length of the rubber plug, and is not less than 3. 5. The stiffening ring is used to prevent the rubber plug from slipping when the water pressure measuring device is installed. Two rubber water plugging plugs can be used for water exploration holes with a hole diameter of φ89-φ140. 6. After the pressure measuring device is installed, the tail can be connected to the anchor rod of the tunnel face with steel bars or steel wire ropes to prevent the pressure measuring device from being withdrawn by water due to excessive water pressure. 7. Open and close the gate valve to observe the water pressure on the water pressure gauge.

Claims

1. A device for measuring water pressure in the fissure water of surrounding rock of a tunnel, comprising a measuring tube (1), one end of the measuring tube (1) being provided with a water inlet (14), the measuring tube (1) being connected to a water pressure gauge (4), at least one water plug being provided on the outer wall of the measuring tube (1), the water plug being provided between the water inlet (14) and the water pressure gauge (4), the measuring tube (1) being connected to a gate valve (2), characterized in that: The water plug has a conical cross section, wherein the conical tip of the water plug faces the water inlet (14), the water plug comprises a first water plug (12) and a second water plug (11), the first water plug (12) is arranged between the water inlet (14) and the second water plug (11), the first inclined plane angle (b) of the first water plug (12) is smaller than the second inclined plane angle (a) of the second water plug (11), and a stiffening ring (13) is arranged inside the water plug, and the stiffening ring (13) extends outwards in a direction perpendicular to the axis of the measuring tube (1); It comprises a water pressure gauge hole (41) on a measuring pipe (1) and connected to a water pressure gauge (4), and a gate valve hole (21) on the measuring pipe (1) and connected to a gate valve (2), wherein the water pressure gauge hole (41) and the gate valve hole (21) are coaxially arranged.

2. The device for measuring water pressure in the surrounding rock fissure of a tunnel according to claim 1, characterized in that: The other end of the measuring tube (1) is provided with a plugging steel plate (3).

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