A reusable tunnel surrounding rock temperature tester and installation method

Abstract

The application discloses a reusable tunnel surrounding rock temperature testing meter and a mounting method, relates to the technical field of tunnel construction, and comprises a liner pipe and a temperature measuring rod which is suitable to be arranged in the liner pipe. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a plurality of axially distributed temperature measuring probes. The temperature measuring rod is internally provided with a

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, more particularly, the present application relates to a reusable tunnel surrounding rock temperature tester and installation method. BACKGROUND

[0002] Under special geographical and geological conditions, due to the combined action of geological structure, lithology and other factors, the heat in the deep part of the earth's crust is continuously supplemented to the surrounding rock area of underground engineering under the influence of engineering activities, forming a high rock temperature area, which has a serious impact on the engineering. During the excavation of the tunnel, due to the influence of complex regional tectonic strata, hydrogeological conditions and other factors, high temperature and a large amount of hot water gush out during the excavation process. The distribution of rock mass temperature directly affects the stress characteristics of surrounding rock after tunnel excavation, thereby affecting the stress characteristics of the supporting structure. Therefore, the basis for studying the stability of the tunnel under high temperature and the stress characteristics of the supporting structure is to obtain the distribution of the tunnel surrounding rock temperature.

[0003] At present, when measuring the temperature distribution of the tunnel surrounding rock, a temperature rod with a temperature probe is used as a temperature tester. This method is simple and reliable, but the grouting hole sealing method makes the temperature tester non-reusable. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a reusable tunnel surrounding rock temperature tester and installation method. By connecting an end cover to the end of the temperature measuring rod, the temperature measuring rod and the end cover can be removed at the same time, thereby achieving the purpose of reusability.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A reusable tunnel surrounding rock temperature tester, comprising a liner pipe and a temperature measuring rod adapted to be arranged in the liner pipe, the inside of the temperature measuring rod is provided with a plurality of axially distributed temperature measuring probes, further comprising an end cover detachably connected with the liner pipe, one end of the middle part of the end cover is provided with a connecting head and the other end has a port, the connecting head is connected with the end cover through a connecting piece, and the connecting head is connected with the end of the temperature measuring rod through a thread, during installation, the temperature measuring rod is located in the inside of the liner pipe, and the gap between the liner pipe and the temperature measuring rod is filled with grout.

[0007] By adopting the above-mentioned technical solutions, the installation of the temperature measuring rod can be facilitated, and the temperature measuring rod and the end cover can be removed together for reuse.

[0008] Preferably, the outer surface of the temperature measuring rod is coated with a plastic film.

[0009] By adopting the above-mentioned technical solutions, when the temperature measuring rod is removed, the temperature measuring rod and the grout can be easily separated.

[0010] Preferably, the plastic film is LLPDE material.

[0011] Preferably, the outer diameter of the connecting head is greater than or equal to the outer diameter of the temperature measuring rod.

[0012] By adopting the above technical scheme, the temperature measuring rod can be further conveniently disassembled, and the blocking of the slurry is reduced.

[0013] Preferably, two dismounting columns are arranged in the circumferential direction of the end cover.

[0014] By adopting the above technical scheme, the two dismounting columns can be rotated by using a tool to conveniently disassemble the end cover. It should be noted that when the end cover is rotated, it should be rotated in the direction of tightening the connecting head and the temperature measuring rod in threaded connection, so as to prevent the end cover and the temperature measuring rod from being separated, thereby causing the problem that the temperature measuring rod is not disassembled.

[0015] The application also provides a mounting method of a reusable tunnel surrounding rock temperature tester, comprising the following steps:

[0016] Step one: drilling a temperature measuring drill hole extending radially towards the mountain body on the inner wall of the tunnel surrounding rock, and placing a liner pipe in the temperature measuring drill hole;

[0017] Step two: threadedly connecting a temperature measuring rod with a plastic film coated on the outer surface and a connecting head, the temperature measuring rod having a temperature measuring probe therein, and placing the temperature measuring rod in the liner pipe, and mounting the end cover and the liner pipe together;

[0018] Step three: connecting a port with a grouting assembly, and grouting through the grouting assembly to the gap between the liner pipe and the temperature measuring rod.

[0019] Preferably, in step three, the grouting assembly comprises a grouting machine, a pressure gauge and a ball valve connected in sequence, and the ball valve is connected to the port on the end cover.

[0020] By adopting the above technical scheme, the pressure during grouting and the pressure during pressure maintaining after grouting can be observed through the pressure gauge, so as to be within the normal range.

[0021] Preferably, in step three, the grouting is ended when the grouting pressure is stabilized for 20-30s at 0.9-1.1MPa.

[0022] Preferably, in step three, the grouting material is a micro-expansion grouting binder, which is uniformly stirred with water, and the water-binder ratio is controlled to be 0.18.

[0023] Technical effects and advantages of the application:

[0024] 1. By connecting an end cap to the end of the temperature measuring rod, and using a combination of physical sealing with slurry sealing, the internal temperature tester, consisting of the temperature measuring rod and the temperature measuring probe, can be disassembled and reused after temperature measurement, thus achieving the purpose of reusability.

[0025] 2. When installing the temperature measuring rod, cover the outer surface of the temperature measuring rod with a plastic film. This will make it easy to remove the temperature measuring rod from the slurry without damaging the temperature measuring rod or the internal temperature measuring probe. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the installation of the temperature tester in Examples 1 and 2.

[0027] Figure 2 This is a schematic diagram of the structure after installation in Example 1.

[0028] Figure 3 This is a structural diagram of the disassembly process in Example 1.

[0029] Figure 4 The diagrams are schematic diagrams of the installation process for Embodiment 1 and Embodiment 2.

[0030] The attached figures are labeled as follows:

[0031] 1. Liner; 2. Temperature measuring rod; 3. Temperature measuring probe; 4. Plastic film; 5. End cap; 50. Bolt; 51. Connector; 52. Connecting piece; 53. Port; 54. Unloading column; 6. Grouting assembly; 61. Grouting machine; 62. Pressure gauge; 63. Ball valve; 10. Tunnel surrounding rock; 11. Temperature measuring borehole. Detailed Implementation

[0032] Example 1

[0033] like Figures 1 to 3 As shown, this embodiment provides a reusable tunnel surrounding rock temperature tester, including a liner 1 and a temperature measuring rod 2 suitable for being installed inside the liner 1. The temperature measuring rod 2 has multiple axially distributed temperature measuring probes 3 inside. It also includes an end cap 5 that is detachably connected to the liner 1. One end of the end cap 5 has a connector 51 and the other end has a port 53. The connector 51 is connected to the end cap 5 through a connecting piece 52. The connector 51 is connected to the end of the temperature measuring rod 2 through a thread. During installation, the temperature measuring rod 2 is located inside the liner 1, and the gap between the liner 1 and the temperature measuring rod 2 is filled with grout.

[0034] In the above, the temperature probe 3 uses a high-sensitivity PN junction temperature sensor, and the number of probes used is 5-8.

[0035] In the installation and use, first, drill the temperature measuring borehole 11 radially extending to the mountain body on the inner wall of the tunnel surrounding rock 10, place the liner tube 1 in the temperature measuring borehole 11; then threadedly connect the temperature measuring rod 2 with the connecting head 51, and place the temperature measuring rod 2 in the liner tube 1, install the end cap 5 and the liner tube 1 together using the bolt 50; finally, connect the port 53 with the grouting assembly 6, grout the gap between the liner tube 1 and the temperature measuring rod 2, and keep the pressure for a period of time.

[0036] And after the use, it needs to be disassembled for repeated use. In order to facilitate the separation of the temperature measuring rod 2 and the grout, when installing the temperature measuring rod 2, a layer of plastic film 4 can be wrapped on the outer surface of the temperature measuring rod 2. The plastic film 4 is made of LLPDE material (linear low density polyethylene), so it is easy to separate. In order to further facilitate the disassembly of the temperature measuring rod 2 from the inside of the liner tube 1, the outer diameter of the connecting head 51 is greater than or equal to the outer diameter of the temperature measuring rod 2. In this way, when disassembling, the resistance of the solidified grout to the temperature measuring rod 2 is reduced. When disassembling, the end cap 5 needs to be rotated. In order to facilitate the rotation of the end cap 5, two dismounting columns 54 are arranged in the circumferential direction of the end cap 5. Specifically, when disassembling, a drilling machine is used first. The drilling machine head is inserted into the port 53 to knock off the grout. Then the bolt 50 is disassembled. The end cap 5 and the temperature measuring rod 2 can be disassembled at the same time by rotating the end cap 5, so as to be reused. It should be noted that when rotating the end cap, it should be rotated in the direction of tightening the thread connection between the connecting head and the temperature measuring rod, so as to prevent the end cap and the temperature measuring rod from separating and causing the problem that the temperature measuring rod is not disassembled.

[0037] Although grout is also used for filling, by connecting the end cap 5 to the end of the temperature measuring rod 2, and by the physical sealing of the end cap 5 or the combination of grout sealing and physical sealing, the temperature measuring rod 2 and the temperature measuring probe 3 inside can be disassembled after the temperature measurement is completed, so as to be reused, thereby achieving the purpose of being reusable.

[0038] Example Two

[0039] As shown in Figures 1-4 , the present embodiment provides a method for installing a reusable tunnel surrounding rock temperature tester, comprising the following steps:

[0040] Step One: Drill the temperature measuring borehole 11 radially extending to the mountain body on the inner wall of the tunnel surrounding rock 10, place the liner tube 1 in the temperature measuring borehole 11;

[0041] Step Two: Threadedly connect the temperature measuring rod 2 with the outer surface wrapped with the plastic film 4 with the connecting head 51, the temperature measuring rod 2 has the temperature measuring probe 3 inside, and place the temperature measuring rod 2 in the liner tube 1, install the end cap 5 and the liner tube 1 together using the bolt 50;

[0042] Step three: connect port 53 with grouting assembly 6, grout the gap between liner 1 and temperature measuring rod 2 through grouting assembly 6, use micro-expansion grouting binder for grouting material, stir uniformly after adding water, control water-binder ratio to be 0.18, grouting ends when the grouting pressure is 0.9-1.1 MPa and the pressure is kept stable for 20-30 s.

[0043] In the above, in step three, grouting assembly 6 includes grouting machine 61, pressure gauge 62 and ball valve 63 connected in sequence, and ball valve 63 is connected to port 53 on end cover 5.

Claims

1. A reusable tunnel surrounding rock temperature tester, comprising a liner (1) and a temperature measuring rod (2) suitable for being installed inside the liner (1), wherein the temperature measuring rod (2) is provided with a plurality of axially distributed temperature measuring probes (3), characterized in that: The liner (1) is detachably connected with an end cover (5), one end of the middle part of the end cover (5) is provided with a connecting head (51), the other end has a port (53), the connecting head (51) is connected with the end cover (5) through a connecting sheet (52), the connecting head (51) is connected with the end of the temperature measuring rod (2) through screw thread, when installed, the temperature measuring rod (2) is located in the inside of the liner (1), the gap between the liner (1) and the temperature measuring rod (2) is filled through slurry; The outer surface of the temperature measuring rod (2) is covered with a plastic film (4).

2. The reusable tunnel surrounding rock temperature tester according to claim 1, characterized in that: The plastic film (4) is LLPDE material.

3. The reusable tunnel surrounding rock temperature tester according to claim 1, characterized in that: The outer diameter of the connecting head (51) is greater than or equal to the outer diameter of the temperature measuring rod (2).

4. The reusable tunnel surrounding rock temperature tester according to claim 1, characterized in that: The end cover (5) is provided with two unloading columns (54) in the circumferential direction.

5. The installation method of the reusable tunnel surrounding rock temperature tester according to any one of claims 1-4, characterized in that, The steps include: Step one: drill a temperature measuring borehole (11) extending radially in the mountain body on the inner wall of the tunnel surrounding rock (10), place the liner (1) in the temperature measuring borehole (11); Step two: thread the temperature measuring rod (2) with the outer surface covered with a plastic film (4) with the connecting head (51), the temperature measuring rod (2) has a temperature measuring probe (3) in it, place the temperature measuring rod (2) in the liner (1), and install the end cover (5) and the liner (1) together; Step three: connect the port (53) with the grouting assembly (6), and grout the gap between the liner (1) and the temperature measuring rod (2) through the grouting assembly (6).

6. The method of installing a reusable tunnel ground temperature gauge according to claim 5, wherein: In step three, the grouting assembly (6) includes a grouting machine (61), a pressure gauge (62) and a ball valve (63) connected in sequence, and the ball valve (63) is connected to the port (53) on the end cover (5).

7. The method of claim 5, wherein the reusable tunnel surrounding rock temperature tester is installed in the tunnel surrounding rock. In step three, the grouting pressure is stabilized at 0.9-1.1MPa for 20-30s, and then the grouting is completed.

8. The method of claim 5, wherein the reusable tunnel surrounding rock temperature tester is installed in the tunnel in the following steps: In step three, the grouting material uses micro-expansion grouting binder, which is stirred uniformly after adding water, and the water-binder ratio is controlled at 0.18.

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