Ground temperature measuring device and construction method thereof

Abstract

The present invention discloses a geothermal measuring device and a construction method thereof. The geothermal measuring device is installed in a borehole, the borehole is an inclined structure, and the height of the starting end of the borehole is lower than the height of its ending end. The geothermal measuring device comprises: a grouting pipe, which is adapted in the borehole, and defines an accommodating cavity therein. The grouting pipe is provided with a slurry inlet port and a grouting hole group connected with the accommodating cavity. The slurry inlet port is arranged near the starting end, and the grouting hole group is arranged at intervals along the extension direction of the grouting pipe, wherein each grouting hole group is covered and sealed by a diaphragm, and the pressure bearing capacity of the diaphragm gradually decreases from the starting end to the ending end; a partition, which is fixed on the outer peripheral wall of the grouting pipe along the circumferential direction of the grouting pipe, and the partition is arranged at intervals along the extension direction of the grouting pipe; a temperature sensor, which is fixedly installed on the outer wall of the grouting pipe and arranged at intervals along the extension direction of the grouting pipe. The temperature sensor is guided to the starting end of the borehole through a data line and coupled to a temperature recorder.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal testing, and in particular to a geothermal measuring device for deep earth resource development and a construction method thereof. Background Art

[0002] As the depth of deep-earth resource development continues to increase, underground temperatures continue to rise. It is of great significance to understand the characteristics of geothermal distribution. However, the temperature measurement process of existing geothermal testing devices is difficult and cumbersome, and the temperature measuring devices are easily damaged, which is not conducive to the implementation of on-site temperature measurement work.

[0003] A Chinese utility model patent, publication number CN 202182782 U, discloses a single-line, multi-point ground temperature tester for a vertical buried pipe shaft. This instrument detects underground temperatures by burying underground pipes within the shaft and installing temperature sensors connected to data storage devices on the pipe walls. However, the tester is complex and dispersed, requiring buried pipes to indirectly measure ground temperatures, resulting in questionable temperature data. The temperature sensors are fixed to the pipe walls by bundling, which not only increases the on-site temperature measurement process and makes implementation more difficult, but also makes point contact between the temperature sensors and the pipes, making the measurement process susceptible to other factors and making it difficult to ensure the reliability of the measurement results.

[0004] Chinese utility model patent publication number CN 209724420 U discloses a high-temperature mine geothermal measurement system. Its features include an airbag, an insulating rod, a temperature sensor, and a copper thermal conductive sheet placed within a borehole. The airbag compresses the insulating rod, ensuring contact between the temperature sensor and the thermal conductive sheet and the borehole wall. This method increases the contact area between the temperature sensor and the borehole wall through the thermal conductive sheet, improving the validity of the temperature measurement data. However, each sensor is connected to a data cable, resulting in a large number of data cables and cumbersome installation of the temperature measurement instrument. Furthermore, when performing deep-hole temperature measurement, the insulating rod is relatively long, making it difficult to install on-site. Summary of the Invention

[0005] In response to the problems and needs raised above, this solution proposes a ground temperature measurement device and its construction method. Due to the adoption of the following technical features, it can achieve the above technical objectives and bring about many other technical effects.

[0006] One object of the present invention is to provide a ground temperature measuring device, which is installed in a borehole opened in a tunnel wall, the borehole is an inclined structure, and the height of the starting end of the borehole is lower than the height of the ending end. The ground temperature measuring device includes:

[0007] A grouting pipe is adapted to be inserted into the borehole, defining an accommodating cavity therein, and provided with a grouting port and a grouting hole group in communication with the accommodating cavity, wherein the grouting port is arranged near the starting end, and the grouting hole groups are arranged at intervals along the extension direction of the grouting pipe, wherein each grouting hole group is covered and sealed by a diaphragm, and the pressure bearing capacity of the diaphragm gradually decreases from the starting end to the ending end;

[0008] baffles, along the circumferential direction of the grouting pipe and fixed on the outer peripheral wall of the grouting pipe, and the baffles are arranged at intervals along the extension direction of the grouting pipe; when the grouting pipe is arranged in the borehole, the baffles abut against the inner wall of the borehole, so that a grouting unit cavity is formed between two adjacent baffles or between a baffle and the terminal end of the borehole, wherein the grouting unit cavity corresponds one-to-one to the grouting hole group; and

[0009] The temperature sensor is fixedly mounted on the outer wall of the grouting pipe and is spaced apart along the extension direction of the grouting pipe. The temperature sensor is guided to the starting end of the borehole through a data line and is coupled to a temperature recorder.

[0010] In addition, the ground temperature measuring device and construction method according to the present invention may also have the following technical features:

[0011] In one example of the present invention, each of the grouting hole groups includes a plurality of grouting holes, and the grouting holes are arranged in an array along the circumferential direction and the extension direction of the grouting pipe.

[0012] In one example of the present invention, a groove is provided along the outer wall of the grouting pipe, and the temperature sensor is installed in the groove.

[0013] In one example of the present invention, the groove is opened along the extension direction of the grouting pipe, and extends from a point close to the starting end toward the ending end.

[0014] In one example of the present invention, a heat conducting sheet is provided on the upper cover of the groove of the grouting pipe, and the heat conducting sheet is in contact with the temperature sensor.

[0015] In an example of the present invention, mounting grooves are provided on both side walls of the groove, and the mounting grooves extend along the extension direction of the groove, and the heat conducting sheet is clamped in the mounting grooves, wherein the heat conducting sheet is an elastic member.

[0016] In one example of the present invention, the partition is a cylindrical structure, and its inner diameter gradually increases from the first end toward the second end, the first end is fixedly connected to the grouting pipe, and the second end opens toward the starting end; wherein, the partition is an elastic member.

[0017] In one example of the present invention, the partition is connected to the outer peripheral wall of the grouting pipe by insert injection molding.

[0018] In an example of the present invention, the angle between the direction in which the drilling hole is opened and the horizontal direction is 2° to 5°.

[0019] Another object of the present invention is to provide a construction method of the ground temperature measuring device as described above, comprising the following steps:

[0020] S10: Drilling a hole obliquely from the tunnel wall into the rock formation so that the height of the starting end of the hole is lower than the height of the ending end;

[0021] S20: performing slag removal on the drill hole, and immediately plugging the starting end of the drill hole with cotton yarn after completion;

[0022] S30: Install the ground temperature measuring device outside the borehole, remove the cotton yarn and install the ground temperature measuring device inside the borehole;

[0023] S40: injecting cement slurry into the accommodating cavity in the grouting pipe from the slurry inlet port. Since the grouting hole group is blocked by the diaphragm, the cement slurry gradually fills the grouting pipe from the side close to the starting end to the side close to the ending end.

[0024] S50: The pressure on the diaphragm gradually increases until it reaches its pressure limit, and the diaphragms rupture in sequence from the side close to the end end to the side close to the start end. That is, in this process, the diaphragm close to the end end ruptures first, and the cement slurry is injected into the grouting unit cavity through the grouting hole and fills the grouting unit cavity. This cycle continues until the grouting unit cavity close to the start end is filled, and grouting is stopped, completing the reverse grouting of the drilling hole in sections.

[0025] S60: After the grouting is completed, the temperature recorder is coupled to the temperature sensor. After the temperature in the borehole reaches a balanced state, the ground temperature data collected by each temperature sensor is observed and recorded by a handheld infrared data transcriber to complete the ground temperature test.

[0026] Hereinafter, the best embodiment of the present invention will be described in more detail with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. The drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0028] Figure 1 Schematic diagram of the structure of the ground temperature measurement device after pre-embedding according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Middle AA section view;

[0030] Figure 3 for Figure 2 A partial enlarged view of the middle Q;

[0031] Figure 4 for Figure 1 Middle BB section view;

[0032] Figure 5 This is a structural diagram of a grouting process near the termination end of a drilling device for a ground temperature measurement device according to an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the grouting process in the middle of a borehole of a ground temperature measuring device according to an embodiment of the present invention;

[0034] Figure 7 This is a structural schematic diagram of a grouting process near the starting end of a drilling device for measuring ground temperature according to an embodiment of the present invention;

[0035] Figure 8 Flowchart of a construction method of a ground temperature measuring device according to an embodiment of the present invention.

[0036] List of reference numerals:

[0037] Cement slurry 300;

[0038] Roadway wall 200;

[0039] Starting end 201;

[0040] Termination terminal 202;

[0041] Drilling 210;

[0042] Ground temperature measuring device 100;

[0043] Grouting pipe 110;

[0044] Accommodating chamber 110A;

[0045] Grouting hole group 111;

[0046] Grouting hole 1111;

[0047] Slurry inlet port 112;

[0048] groove 113;

[0049] Thermal conductive sheet 114;

[0050] Mounting slot 115;

[0051] Partition 120;

[0052] first end 121;

[0053] a second end 122;

[0054] Diaphragm 130;

[0055] Temperature sensor 140;

[0056] Temperature recorder 150;

[0057] Handheld infrared data transcriber 160;

[0058] Temperature transmitter 170;

[0059] USB interface 180;

[0060] Grouting unit cavity G;

[0061] Extension direction Y;

[0062] Horizontal direction X;

[0063] Circumferential direction R. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not necessarily indicate a quantity limitation. Words such as "include" or "comprising" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] According to a first aspect of the present invention, a ground temperature measuring device 100 is provided. Figure 1 As shown in FIG7 , it is installed in a borehole 210 opened on the tunnel wall 200. The borehole 210 is an inclined structure, and the height of the starting end 201 of the borehole 210 is lower than the height of the ending end 202. The ground temperature measuring device 100 includes:

[0067] The grouting pipe 110 is adapted to be placed in the borehole 210, and defines an accommodating chamber 110A therein. The grouting pipe 110 is provided with a grouting port 112 and a grouting hole group 111 in communication with the accommodating chamber 110A. The grouting port 112 is arranged near the starting end 201, and the grouting hole group 111 is arranged at intervals along the extension direction Y of the grouting pipe 110. Each of the grouting hole groups 111 is sealed by a diaphragm 130, and the pressure bearing capacity of the diaphragm 130 gradually decreases from the starting end 201 to the ending end 202. Under the action of the corresponding ultimate bearing capacity, rupture will occur. The thickness of the diaphragm 130 corresponding to the corresponding position of the grouting pipe 110 can be calculated based on the specific working conditions; after the cement slurry 300 is injected into the accommodating cavity 110A from the slurry inlet port 112, the cement slurry 300 is gradually filled in the grouting pipe 110 from the side close to the starting end 201 to the side close to the ending end 202. The diaphragm 130 located at the ending end 202 will rupture first after reaching the pressure limit. In turn, the diaphragms 130 rupture one by one from the side close to the ending end 202 toward the side close to the starting end 201.

[0068] The partitions 120 are fixed to the outer peripheral wall of the grouting pipe 110 along the circumferential direction R of the grouting pipe 110, and the partitions 120 are arranged at intervals along the extension direction Y of the grouting pipe 110; when the grouting pipe 110 is arranged in the borehole 210, the partitions 120 abut against the inner wall of the borehole 210, so that a grouting unit cavity G is formed between two adjacent partitions 120 or between the partition 120 and the terminal end 202 of the borehole 210, wherein the grouting unit cavity G corresponds one-to-one to the grouting hole group 111; and

[0069] The temperature sensor 140 is fixedly mounted on the outer wall of the grouting pipe 110 and is spaced apart along the extension direction Y of the grouting pipe 110 . The temperature sensor 140 is guided to the starting end 201 of the borehole 210 via a data line and is coupled to the temperature recorder 150 .

[0070] Cement slurry 300 is injected into the accommodating cavity 110A in the grouting pipe 110 through the slurry inlet port 112. Due to the gravity of the cement slurry 300 and the grouting hole group 111 being blocked by the diaphragm 130, the cement slurry 300 is gradually filled in the grouting pipe 110 from the side close to the starting end 201 to the side close to the ending end 202; the pressure on the diaphragm 130 gradually increases until it reaches the pressure limit of the diaphragm 130. Since the pressure bearing capacity of the diaphragm 130 gradually decreases from the starting end 201 to the ending end 202, the diaphragm 130 is gradually filled from the side close to the ending end 202 to the starting end 201. One side ruptures in sequence, that is, in this process, the diaphragm 130 near the end end 202 ruptures first, and the cement slurry 300 is injected into the grouting unit cavity G through the grouting hole group 111 and fills the grouting unit cavity G. This cycle is repeated until the grouting unit cavity G near the starting end 201 is filled and the grouting is stopped, completing the reverse grouting of the borehole 210 in sections. After the grouting is completed, the temperature recorder 150 is coupled to the temperature sensor 140. After the temperature in the borehole 210 reaches a equilibrium state, the ground temperature data collected by each temperature sensor 140 is observed and recorded by the handheld infrared data transcriber 160 to complete the ground temperature test.

[0071] First, the measuring device buries multiple temperature sensors 140 in the grouting pipe 110, integrating temperature measurement and grouting, simplifying the process, and making it easy for workers to carry, thus simplifying the on-site construction process; secondly, the temperature measuring borehole 210 is arranged to be tilted upward to prevent groundwater from accumulating at the bottom of the hole and affecting the temperature in the hole, making the measurement more accurate; then, the grouting hole group 111 set on the wall of the grouting pipe 110 cooperates with the diaphragm 130 with a pressure gradient wrapped outside the grouting hole group 111 and the trumpet-shaped elastic thin iron sheet set on the surface of the grouting pipe 110 to achieve reverse grouting and blocking of the borehole 210 from the inside to the outside; the measuring device can reduce the difficulty of work for underground workers, reduce the influence of factors such as groundwater and air on the temperature measurement process, ensure that the temperature test data in the borehole 210 is scientific and effective, and the device is simple and low-cost.

[0072] Preferably, the hard grouting pipe 1101 arranged inside the borehole 210 is made of UPVC pipe (rigid polyvinyl chloride pipe) hard material, which has high rigidity, hardness and good flexibility. It can be manually delivered to the terminal end 202 (bottom) of the borehole 210 without a guide rod. The length is slightly larger than the depth of the temperature measuring borehole 21011, and the end of the grouting pipe 110 is about 10 cm away from the bottom of the hole.

[0073] In one example of the present invention, each of the grouting hole groups 111 includes a plurality of grouting holes 1111 , and the grouting holes 1111 are arranged in an array along the circumferential direction R and the extension direction Y of the grouting pipe 110 ;

[0074] That is to say, by arranging the grouting holes 1111 in an array, the flow rate of the cement slurry 300 discharged from the grouting hole group 111 can be increased, and the grouting efficiency can be improved. Moreover, the grouting hole group 111 with this structure is easy to process.

[0075] In one example of the present invention, Figure 2 and Figure 3 As shown, a groove 113 is opened along the outer wall of the grouting pipe 110, and the temperature sensor 140 is installed in the groove 113;

[0076] For example, a temperature sensor 140 is installed every 5 m in the axial groove 113 of the grouting pipe 110 . High-precision armored PT100 thermistors with a diameter of 5 mm are used. The first temperature sensor 140 near the terminal end 202 of the borehole 210 is set at a position 10 cm away from the end of the grouting pipe 110 .

[0077] The groove 113 can be provided to protect the sensor, thereby preventing damage to the temperature sensor 140 during installation or grouting.

[0078] like Figure 1 As shown, a groove 113 with a width of 5 mm is opened on the surface of the hard grouting pipe 110 along the axial direction of the grouting pipe 110 , and its end is 10 cm away from the end of the grouting pipe 110 .

[0079] In one example of the present invention, the groove 113 is opened along the extension direction Y of the grouting pipe 110 and extends from the starting end 201 to the ending end 202;

[0080] Since the temperature sensor 140 is coupled to the external temperature recorder 150 via the data line and the temperature transmitter 170 , the groove 113 with the above structure can facilitate the arrangement of the data line, wherein the temperature transmitter can be installed in the groove 113 .

[0081] In one example of the present invention, Figure 4 As shown, the grouting holes 1111 are arranged in an array at designated angles along the circumferential direction R. For example, the designated angle is 90 degrees, and the grouting holes 1111 are respectively arranged at circumferential positions of 0 degrees, 90 degrees, and 180 degrees;

[0082] More specifically, a group of grouting holes 111 with a diameter of 20 mm is set every 100 mm along the extension direction Y of the grouting pipe 110, and each grouting hole group 111 is arranged 3 along the circumferential direction R of the grouting pipe 110. Each grouting hole 1111 is 90° apart, and the groove 113 can be set at the 270 degree position, which does not overlap with the position of the grouting hole 1111.

[0083] In one example of the present invention, the groove 113 of the grouting pipe 110 is covered with a heat conducting sheet 114 , and the heat conducting sheet 114 abuts against the temperature sensor 140 ;

[0084] Since the groove 113 has an open end, by providing a heat conductive sheet 114 on the open end, on the one hand, it can protect the temperature sensor 140, data line, etc.; on the other hand, it can also play a heat conductive role, thereby improving the measurement accuracy of the temperature sensor 140; for example, the heat conductive sheet 114 can be a copper heat conductive sheet.

[0085] In one example of the present invention, mounting grooves 115 are formed on both side walls of the groove 113, and the mounting grooves 115 extend along the extension direction Y of the groove 113. The heat conducting sheet 114 is clamped in the mounting grooves 115, wherein the heat conducting sheet 114 is an elastic member.

[0086] Preferably, in order to facilitate installation, the heat conducting plates 114 include a plurality of heat conducting plates 114 , and the plurality of heat conducting plates 114 are sequentially engaged with the installation grooves 115 along the extension direction Y of the grouting pipe 110 .

[0087] The heat conducting sheet 114 can be fixed in the groove 113 by snapping the mounting groove 115 with the heat conducting sheet 114, which has high reliability.

[0088] Of course, the present invention is not limited thereto, and the groove 113 and the heat conducting plate 114 may also be connected by a snap connection or fasteners.

[0089] In one example of the present invention, the partition 120 is a cylindrical structure, and its inner diameter gradually increases from the first end 121 toward the second end 122, the first end 121 is fixedly connected to the grouting pipe 110, and the second end 122 opens toward the starting end 201; wherein, the partition 120 is an elastic member; the partition 120 can be a metal plate, such as an iron partition, etc., of course, it can also be other non-metallic plates, as long as it has a certain flexibility, this is to facilitate its installation in the drilled hole 210.

[0090] That is to say, a plurality of trumpet-shaped elastic partitions 120 are arranged on the surface of the hard grouting pipe 110, and the maximum outer edge diameter thereof is slightly larger than or equal to the diameter of the borehole 210, and is in close contact with the wall of the borehole 210, which can separate the borehole 210 space and prevent the slurry from passing through. The partition 120 with the above-mentioned gradual inner diameter can effectively extend outward in the circumferential direction R of the grouting pipe 110, so that it can stop and engage with the inner wall of the borehole 210, forming a grouting unit cavity G between two adjacent partitions 120, so that the cement slurry 3 00 can fill the borehole 210 in sections; and because the second end 122 of the partition 120 is facing the starting end 201, when the ground temperature measuring device 100 is installed, the second end 122 of the partition 120 is squeezed and deformed and shrinks, which makes it easier to extend the grouting pipe 110 into the borehole 210; and once the grouting pipe 110 is installed in a suitable position, the shrinkage elastic force of the partition 120 itself will make it engage with the inner wall of the borehole 210 and it is not easy to fall off from the borehole 210, thereby playing a good fixing role.

[0091] It should be noted that the partition 120 is not completely sealed from the inner wall of the borehole 210. Its existence is to enable the borehole 210 to achieve segmented grouting and block and slow down the flow rate of the cement slurry 300. At the same time, it can play a role in exhausting when injecting cement slurry, avoiding the presence of gas in the grouting unit cavity G and affecting the grouting effect of the cement slurry.

[0092] In one example of the present invention, the partition 120 is connected to the outer peripheral wall of the grouting pipe 110 by insert injection molding;

[0093] The above process can realize the integral molding between the partition plate 120 and the grouting pipe 110, avoiding the trouble of assembly, and having high reliability and great structural strength.

[0094] Preferably, the diaphragm 130 is a rubber membrane; specifically, the diaphragm 130 can be fixed to the outside of the grouting hole group 111 by sealing with strong glue. In order to prevent the diaphragm 130 from rupturing, the strong glue is adhered to both sides of the drilled hole 210. Of course, the present invention is not limited to this. The diaphragm 130 can also be made of flexible plastic, Oxford cloth, PVC, aluminum foil, etc. The principle is similar to that of balloons with different pressure bearing capacities. As long as it is flexible, can be sealed, and will rupture under the corresponding bearing force, any similar material can be used.

[0095] Preferably, the angle between the direction in which the borehole 210 is opened and the horizontal direction X is 2° to 5°. After repeated tests, it was found that the borehole 210 is within the above-mentioned angle range, which can prevent groundwater from accumulating at the terminal end 202 of the borehole 210 and affecting the temperature measurement, and can also prevent the borehole 210 from falling off.

[0096] According to the second aspect of the present invention, a construction method of the ground temperature measuring device 100 as described above is as follows: Figures 5 to 8 As shown, the following steps are included:

[0097] S10: Drilling a hole 210 obliquely into the rock formation from the tunnel wall 200, such that the height of the starting end 201 of the hole 210 is lower than the height of the ending end 202 thereof;

[0098] S20: The borehole 210 is cleaned, and cotton yarn is immediately used to block the starting end 201 of the borehole 210 after the completion of the slag cleaning process; the cotton yarn is used to block the borehole 210 after the slag cleaning process is completed to prevent the temperature in the tunnel from affecting the temperature in the borehole 210.

[0099] S30: Install the ground temperature measuring device 100 outside the borehole 210, remove the cotton yarn and install the ground temperature measuring device 100 inside the borehole 210;

[0100] S40: Cement slurry 300 is injected into the accommodating cavity 110A in the grouting pipe 110 through the slurry inlet port 112. Since the grouting hole group 111 is blocked by the diaphragm 130, the cement slurry 300 gradually fills the grouting pipe 110 from the side close to the starting end 201 to the side close to the ending end 202.

[0101] S50: The pressure on the diaphragm 130 gradually increases until it reaches the pressure limit of the diaphragm 130, and the diaphragms 130 rupture in sequence from the side close to the end end 202 to the side of the starting end 201. That is, in this process, the diaphragm 130 close to the end end 202 ruptures first, and the cement slurry 300 is injected into the grouting unit cavity G through the grouting hole 1111 and fills the grouting unit cavity G. This cycle continues until the grouting unit cavity G close to the starting end 201 is filled, and the grouting is stopped, completing the reverse grouting of the borehole 210 in sections.

[0102] S60: After the grouting is completed, the temperature recorder 150 is coupled to the temperature sensor 140. After the temperature in the borehole 210 reaches a state of equilibrium, the ground temperature data collected by each temperature sensor 140 is observed and recorded by the handheld infrared data transcriber 160 to complete the ground temperature test. Specifically, after the grouting is completed, the USB interface 180 external to the temperature recorder 150 is connected to the interface on the data bus. After the temperature in the temperature-measured borehole 210 reaches a state of equilibrium, a data connection is established between the infrared signal generator on the temperature recorder 150 and the infrared signal receiver of the handheld infrared data transcriber 160. At this time, the ground temperature data collected by the temperature sensor 140 is converted into a stable voltage signal by the temperature transmitter 170, and then transmitted to the temperature recorder 150 via the data bus. The temperature recorder 150 transmits the temperature measurement data to the handheld infrared data transcriber 160 via an infrared signal, and the handheld infrared data transcriber 160 observes and records the temperature measurement results in real time.

[0103] The construction method of the geothermal measuring device 100 of the present invention can integrate grouting and sealing with geothermal testing, simplify the temperature measurement process of the borehole 210, and protect the temperature measuring instrument from damage; moreover, it can reduce the difficulty of work for underground workers, reduce the influence of factors such as groundwater and air on the temperature measurement process, ensure that the temperature test data in the borehole 210 is scientific and effective, and the device is simple and low-cost.

[0104] In one example of the present invention, in step S20, the slag removal process on the borehole 210 includes:

[0105] Insert the air duct of the blower into the borehole 210, blow high-pressure air into the borehole 210, and repeatedly pump and pull to remove the debris in the borehole 210;

[0106] That is to say, after the high-pressure air is blown in, the slag will be blown by the wind and its own gravity and will roll along the inner wall of the borehole 210 from the end end 202 to the starting end 201 and leave the borehole 210. The blower can quickly clean up the slag in the borehole 210.

[0107] In one example of the present invention, in step S60, recording the ground temperature data collected by each temperature sensor 140 includes:

[0108] Each ground temperature data collection time is no less than 1 minute, and the temperature is measured continuously for 6 months. The initial temperature measurement frequency is once a day, and it can be adjusted to once a week after the temperature of the borehole 210 reaches a balanced state;

[0109] After the ground temperature test is completed, the USB connector of the temperature recorder 150 is unplugged for ground temperature test of the next temperature measuring borehole 210 ; the ground temperature can be effectively and accurately monitored by the above-mentioned ground temperature measuring method.

[0110] The exemplary implementation of the geothermal measurement device 100 and the construction method thereof proposed in the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. A ground temperature measuring device, characterized in that: It is installed in a borehole (210) opened on a tunnel wall (200), the borehole (210) is an inclined structure, and the height of the starting end (201) of the borehole (210) is lower than the height of the ending end (202). The ground temperature measuring device (100) includes: A grouting pipe (110) is adapted to be installed in the borehole (210), and defines an accommodating chamber (110A) therein. The grouting pipe (110) is provided with a grouting port (112) and a grouting hole group (111) in communication with the accommodating chamber (110A). The grouting port (112) is arranged near the starting end (201), and the grouting hole groups (111) are arranged at intervals along the extension direction (Y) of the grouting pipe (110). Each of the grouting hole groups (111) is covered and sealed by a diaphragm (130), and the pressure bearing capacity of the diaphragm (130) gradually decreases from the starting end (201) to the ending end (202); A partition (120) is arranged along the circumferential direction (R) of the grouting pipe (110) and fixed on the outer peripheral wall of the grouting pipe (110), and the partition (120) is arranged at intervals along the extension direction (Y) of the grouting pipe (110); when the grouting pipe (110) is arranged in the borehole (210), the partition (120) and the inner wall of the borehole (210) are stopped, so that a grouting unit cavity (G) is formed between two adjacent partitions (120) or between a partition (120) and the terminal end (202) of the borehole (210), wherein the grouting unit cavity (G) corresponds one-to-one to the grouting hole group (111); The temperature sensor (140) is fixedly mounted on the outer wall of the grouting pipe (110) and is spaced apart along the extension direction (Y) of the grouting pipe (110). The temperature sensor (140) is guided to the starting end (201) of the borehole (210) via a data line and is coupled to a temperature recorder (150).

2. The ground temperature measuring device according to claim 1, characterized in that: Each grouting hole group (111) comprises a plurality of grouting holes (1111), and the grouting holes (1111) are arranged in an array along the circumferential direction (R) and the extension direction (Y) of the grouting pipe (110).

3. The ground temperature measuring device according to claim 1, characterized in that: A groove (113) is provided along the outer wall of the grouting pipe (110), and the temperature sensor (140) is installed in the groove (113).

4. The ground temperature measuring device according to claim 3, characterized in that: The groove (113) is opened along the extension direction (Y) of the grouting pipe (110), and extends from a point close to the starting end (201) toward the ending end (202).

5. The ground temperature measuring device according to claim 3, characterized in that: The groove (113) of the grouting pipe (110) is covered with a heat conducting plate (114), and the heat conducting plate (114) is in contact with the temperature sensor (140).

6. The ground temperature measuring device according to claim 5, characterized in that: Mounting grooves (115) are provided on both side walls of the groove (113), and the mounting grooves (115) extend along an extension direction (Y) of the groove (113). The heat conducting sheet (114) is snap-fitted into the mounting grooves (115), wherein the heat conducting sheet (114) is an elastic member.

7. The ground temperature measuring device according to claim 1, characterized in that: The partition (120) is a cylindrical structure, and its inner diameter gradually increases from the first end (121) toward the second end (122), the first end (121) is fixedly connected to the grouting pipe (110), and the second end (122) opens toward the starting end (201); wherein, the partition (120) is an elastic member.

8. The ground temperature measuring device according to claim 7, characterized in that: The partition (120) is connected to the outer peripheral wall of the grouting pipe (110) by insert injection molding.

9. The ground temperature measuring device according to claim 1, characterized in that: The angle between the direction in which the drilling hole (210) is opened and the horizontal direction (X) is 2° to 5°.

10. A construction method of a ground temperature measuring device according to any one of claims 1 to 9, characterized in that: The steps include: S10: Drilling a hole (210) obliquely from the tunnel wall (200) into the rock formation, such that the height of the starting end (201) of the hole (210) is lower than the height of the ending end (202); S20: performing a slag cleaning process on the drill hole (210), and immediately blocking the starting end (201) of the drill hole (210) with cotton yarn after the process is completed; S30: Installing the ground temperature measuring device (100) outside the borehole (210), removing the cotton yarn and installing the ground temperature measuring device (100) inside the borehole (210); S40: Cement slurry (300) is injected into the accommodating cavity (110A) in the grouting pipe (110) through the slurry inlet port (112). Since the grouting hole group (111) is blocked by the diaphragm (130), the cement slurry (300) gradually fills the grouting pipe (110) from the side close to the starting end (201) to the side close to the ending end (202); S50: the pressure on the diaphragm (130) gradually increases until it reaches the pressure limit of the diaphragm (130), and the diaphragm (130) ruptures in sequence from the side close to the end end (202) to the side close to the starting end (201), that is, in this process, the diaphragm (130) close to the end end (202) ruptures first, and the cement slurry (300) is injected into the grouting unit cavity (G) through the grouting hole (1111) and fills the grouting unit cavity (G), and the cycle is repeated until the grouting unit cavity (G) close to the starting end (201) is filled, and the grouting is stopped, completing the reverse grouting of the borehole (210); S60: After the grouting is completed, the temperature recorder (150) is coupled to the temperature sensor (140). After the temperature in the borehole (210) reaches a balanced state, the ground temperature data collected by each temperature sensor (140) is observed and recorded by a handheld infrared data transcriber (160) to complete the ground temperature test.

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