A splicing lengthening buried protection device

Abstract

The utility model provides a kind of splicing lengthening buried protection device, including buried base cylinder, buried upper cover and buried lengthening cylinder, one or more are spliced in the lower end of the buried base cylinder to increase the length of buried protection device, in turn accommodate depth requirement of burying;The buried base cylinder and the buried lengthening cylinder are all upper and lower through cylinder;The upper end of the buried base cylinder is integrally formed with the detection cylinder section for built-in installation and protection gas detector;The buried upper cover is detachably installed in the upper end of the detection cylinder section, for closing the upper end port of the detection cylinder section, so as to protect gas detector when burying.The utility model can effectively increase the length of buried protection device, to adapt to different depth of burying, ensure that gas detector can adapt to the detection of buried gas pipeline of different depth of burying.

Description

Technical Field

[0001] This utility model relates to the technical field of underground detection facilities, specifically, to an extendable underground protection device. Background Technology

[0002] The variety of underground gas pipelines in cities is increasing daily. Gas detectors used for leak detection generally also need to be installed underground for easy maintenance. Therefore, underground protection devices suitable for gas detector installation have emerged. However, with the rapid development of gas detection instruments, the requirements for underground protection devices are gradually increasing. First, some underground gas pipelines are located deep below ground, while others are shallow. Therefore, underground protection devices must be able to meet the requirements of different burial depths. Previous products struggled to meet these requirements. Therefore, a modular, extendable underground protection device has been designed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an extendable underground protection device that can be spliced ​​together.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a splicable and extendable underground protection device, comprising an underground main tube, an underground top cover, and an underground extension tube. One or more underground extension tubes are spliced ​​to the lower end of the underground main tube to increase the length of the underground protection device, thereby adapting to the requirements of the underground burial depth. Both the underground main tube and the underground extension tube are cylindrical tubes that are open at both ends. The upper end of the underground main tube has an integrally formed detection tube section for internal installation and protection of a gas detector. The underground top cover is detachably installed on the upper end of the detection tube section to seal the upper port of the detection tube section, so as to protect the gas detector when buried.

[0005] Based on the above, both the underground main tube and the underground extended tube have several ventilation holes on their bodies.

[0006] Based on the above, it also includes bottomed dustproof net cylinders and bottomless dustproof net cylinders for preventing sand and gravel from entering the underground protection device; both the bottomed dustproof net cylinder and the bottomless dustproof net cylinder are provided with several locking bolts;

[0007] When the underground main tube is not spliced ​​with the underground extension tube, the bottom dustproof net tube is fitted onto the underground main tube from bottom to top and can be fixedly connected to the underground main tube by a number of corresponding locking bolts. The bottomless dustproof net tube is reserved as a spare part.

[0008] When the underground main tube is spliced ​​with an underground extension tube, the bottom dustproof net tube is fitted onto the underground extension tube from bottom to top and can be fixedly connected to the underground extension tube by a number of corresponding locking bolts; the bottomless dustproof net tube is fitted onto the underground main tube and can be fixedly connected to the underground main tube by a number of corresponding locking bolts.

[0009] When the underground main tube is spliced ​​with multiple underground extension tubes, the bottom dustproof net tube is fitted onto the bottommost underground extension tube from bottom to top and can be fixedly connected to the bottommost underground extension tube by a number of corresponding locking bolts. One bottomless dustproof net tube is fitted onto the underground main tube and all the underground extension tubes except the bottommost one. Each bottomless dustproof net tube can be fixed onto the underground main tube and all the underground extension tubes except the bottommost one by a number of corresponding locking bolts.

[0010] Based on the above, the upper end of the underground extension tube is integrally formed with a splicing tube segment, the outer diameter of the splicing tube segment is the same as the inner diameter of the lower port of the underground main tube and the inner diameter of the lower port of the underground extension tube; the outer circle of the splicing tube segment is provided with an external thread, and the inner circle of the lower port of the underground main tube and the inner circle of the lower port of the underground extension tube are both provided with internal threads that cooperate with the external thread;

[0011] When the underground main tube and the underground extension tube are spliced ​​together, the splicing section at the upper end of the underground extension tube is threadedly connected to the lower port of the underground main tube through the combination of external and internal threads.

[0012] When the two underground extension tubes are spliced ​​together, the splicing tube section at the upper end of the lower underground extension tube is threadedly connected to the lower port of the upper underground extension tube through the combination of external and internal threads.

[0013] Based on the above, the upper end of the buried extension tube is integrally formed with a splicing tube segment, the outer diameter of the splicing tube segment is the same as the inner diameter of the lower port of the buried main tube and the inner diameter of the lower port of the buried extension tube; the upper end of the bottomed dustproof net tube and the upper and lower ends of the bottomless dustproof net tube are integrally formed with reinforcing rings, and the reinforcing rings are provided with a plurality of first threaded holes arranged in a circular array along the radial direction, and the locking bolts are threaded in the first threaded holes; the upper and lower end sidewalls of the buried main tube and the upper and lower end sidewalls of the buried extension tube are provided with a plurality of second threaded holes arranged in a circular array.

[0014] When the underground main tube and the underground extension tube are spliced ​​together, the splicing section at the upper end of the underground extension tube is inserted into the lower end of the underground main tube. A bottomless dustproof net tube is fitted onto the underground main tube. Each of the first threaded holes on the reinforcing ring at the lower end of the bottomless dustproof net tube corresponds one-to-one with each of the second threaded holes on the lower side wall of the underground main tube. The inner ends of each locking bolt on the reinforcing ring at the lower end of the bottomless dustproof net tube are screwed into each of the second threaded holes on the lower side wall of the underground main tube. The inner ends of each of the locking bolts on the end reinforcing ring are pressed tightly against the outer circle of the splicing section at the upper end of the buried extension tube, so that the buried extension tube is fixedly connected to the buried main tube. At the same time, each of the first threaded holes on the upper end reinforcing ring of the bottomless dustproof net tube corresponds one-to-one with each of the second threaded holes on the upper side wall of the buried main tube. The inner ends of each of the locking bolts on the upper end reinforcing ring of the bottomless dustproof net tube are screwed into each of the second threaded holes on the upper side wall of the buried main tube, so that the bottomless dustproof net tube is fixed on the buried main tube.

[0015] When the two underground extension tubes are spliced ​​together, the splicing section at the upper end of the lower underground extension tube is inserted into the lower port of the upper underground extension tube. A bottomless dustproof net tube is fitted onto the upper underground extension tube. The first threaded holes on the reinforcing ring at the lower end of the bottomless dustproof net tube correspond one-to-one with the second threaded holes on the lower sidewall of the upper underground extension tube. The inner ends of the locking bolts on the reinforcing ring at the lower end of the bottomless dustproof net tube are screwed into the second threaded holes on the lower sidewall of the upper underground extension tube. The bottomless dustproof net tube... The inner ends of the locking bolts on the reinforcing ring at the lower end of the net cylinder are pressed tightly against the outer circle of the splicing section at the upper end of the buried extension cylinder on the lower side, so that the two buried extension cylinders are fixedly connected. At the same time, the first threaded holes on the reinforcing ring at the upper end of the bottomless dustproof net cylinder correspond one-to-one with the second threaded holes on the upper side wall of the buried extension cylinder on the upper side. The inner ends of the locking bolts on the reinforcing ring at the upper end of the bottomless dustproof net cylinder are screwed into the second threaded holes on the upper side wall of the buried extension cylinder on the upper side, so that the bottomless dustproof net cylinder is fixed on the buried extension cylinder on the upper side.

[0016] When the bottom dustproof net cylinder is fitted onto the underground main cylinder or the underground extension cylinder, each of the first threaded holes on the bottom dustproof net cylinder corresponds one-to-one with each of the second threaded holes on the upper side wall of the underground main cylinder or the underground extension cylinder. The inner ends of each of the locking bolts on the bottom dustproof net cylinder are screwed into each of the second threaded holes on the upper side wall of the underground main cylinder or the underground extension cylinder, so that the bottom dustproof net cylinder is fixed onto the underground main cylinder or the underground extension cylinder.

[0017] Based on the above, the lower outer circumference of the buried cover is provided with a number of self-locking protrusions arranged in a circular array, and the inner circumference of the upper port of the detection cylinder is provided with a number of self-locking grooves arranged in a circular array. Each of the self-locking protrusions is respectively engaged in the corresponding self-locking grooves. The buried cover is fixedly connected to the upper end of the detection cylinder by a number of countersunk bolts.

[0018] This utility model has substantial features and progress compared with the prior art. Specifically, the underground tube of this utility model can be spliced ​​with one or more underground extension tubes, thereby effectively increasing the length of the underground protection device to adapt to different burial depths and ensure that the gas detector can adapt to the detection of underground gas pipelines at different burial depths.

[0019] Furthermore, the underground cylinder and the underground extension cylinder of this utility model are provided with vent holes, which increases the permeability of the underground protection device and facilitates the entry of leaked gas from the underground gas pipeline into the underground protection device, thereby improving the detection accuracy of the gas detector.

[0020] Furthermore, this utility model is designed with a bottomed dustproof net tube and a bottomless dustproof net tube, which are used to be fitted onto the underground main tube or the underground extension tube to prevent sand and gravel from entering the underground protection device, ensuring the cleanliness of the underground protection device and the air permeability of the underground protection device.

[0021] This utility model only requires the preparation of spare parts such as the underground tube, the underground cover, the bottom dustproof net tube, the underground extended tube, and the bottomless dustproof net tube, which can be assembled as needed, reducing the difficulty of material preparation and warehousing, and reducing assembly requirements. Attached Figure Description

[0022] Figure 1 This is an exploded structural diagram of the present invention when assembling an underground extension tube.

[0023] Figure 2 This is an assembly diagram of the present invention when splicing together an underground extension tube.

[0024] Figure 3 yes Figure 2 A sectional view.

[0025] Figure 4 This is an exploded structural diagram of the present invention without the underground extended tube being spliced.

[0026] Figure 5 This is an assembly diagram of the utility model without the underground extension tube being spliced.

[0027] Figure 6 This is a schematic diagram of the structure of the underground cover of this utility model.

[0028] Figure 7 This is a schematic diagram of the structure of the underground tube of this utility model.

[0029] Figure 8 This is a schematic diagram showing the completed installation of the underground protection device of this utility model.

[0030] In the diagram: 1. Underground main tube; 2. Underground top cover; 3. Underground extension tube; 4. Gas detector; 5. Detection tube section; 6. Ventilation hole; 7. Dustproof net tube with bottom; 8. Dustproof net tube without bottom; 9. Reinforcing ring; 10. Locking bolt; 11. Spliced ​​tube section; 12. Self-locking protrusion; 13. Self-locking groove; 14. Countersunk bolt; 15. Hardened road surface; 16. Earth; 17. Underground protection device. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0032] like Figures 1 to 8 As shown, an extendable underground protection device includes an underground cylinder 1, an underground cover 2, and an underground extension cylinder 3. One or more underground extension cylinders 3 are spliced ​​to the lower end of the underground cylinder 1 to increase the length of the underground protection device 17, thereby adapting to the burial depth requirements. Both the underground cylinder 1 and the underground extension cylinder 3 are open-ended cylinders. The upper end of the underground cylinder 1 is integrally formed with a detection cylinder section 5 for internal installation and protection of a gas detector 4. The underground cover 2 is detachably installed on the upper end of the detection cylinder section 5 to seal the upper port of the detection cylinder section 5, so as to protect the gas detector 4 when buried.

[0033] In this embodiment, both the underground main tube 1 and the underground extension tube 3 have several ventilation holes 6 on their bodies. The ventilation holes 6 can increase the air permeability of the underground protection device 17, which is conducive to the entry of gas into the underground protection device 17 and improves the detection accuracy of the gas detector 4.

[0034] The underground protection device 17 also includes a bottomed dustproof net cylinder 7 and a bottomless dustproof net cylinder 8 for preventing sand and gravel from entering the underground protection device 17; both the bottomed dustproof net cylinder 7 and the bottomless dustproof net cylinder 8 are provided with a number of locking bolts 10.

[0035] When the underground main tube 1 is not spliced ​​with the underground extension tube 3, the bottom dustproof net tube 7 is fitted onto the underground main tube 1 from bottom to top and can be fixedly connected to the underground main tube 1 by a number of corresponding locking bolts 10. The bottomless dustproof net tube 8 is reserved as a spare part.

[0036] When the underground main tube 1 is spliced ​​with an underground extension tube 3, the bottom dustproof net tube 7 is fitted onto the underground extension tube 3 from bottom to top and can be fixedly connected to the underground extension tube 3 by a number of corresponding locking bolts 10. The bottomless dustproof net tube 8 is fitted onto the underground main tube 1 and can be fixedly connected to the underground main tube 1 by a number of corresponding locking bolts 10.

[0037] When the underground main tube 1 is spliced ​​with multiple underground extension tubes 3, the bottom dustproof net tube 7 is fitted onto the bottommost underground extension tube 3 from bottom to top and can be fixedly connected to the bottommost underground extension tube 3 by a number of corresponding locking bolts 10. One bottomless dustproof net tube 8 is fitted onto the underground main tube 1 and all the underground extension tubes 3 except the bottommost one. Each bottomless dustproof net tube 8 can be fixed onto the underground main tube 1 and all the underground extension tubes 3 except the bottommost one by a number of corresponding locking bolts 10.

[0038] In this embodiment, the upper end of the underground extension tube 3 is integrally formed with a splicing tube section 11. The outer diameter of the splicing tube section 11 is the same as the inner diameter of the lower port of the underground main tube 1 and the inner diameter of the lower port of the underground extension tube 3. The outer circle of the splicing tube section 11 is provided with an external thread, and the inner circle of the lower port of the underground main tube 1 and the inner circle of the lower port of the underground extension tube 3 are both provided with internal threads that cooperate with the external threads.

[0039] When the underground main tube 1 and the underground extension tube 3 are spliced ​​together, the splicing tube section 11 at the upper end of the underground extension tube 3 is threadedly connected to the lower port of the underground main tube 1 through the cooperation of external and internal threads.

[0040] When the two underground extension tubes 3 are spliced ​​together, the splicing tube section 11 at the upper end of the lower underground extension tube 3 is threadedly connected to the lower port of the upper underground extension tube 3 through the engagement of external and internal threads.

[0041] In this embodiment, the lower outer circumference of the buried cover 2 is provided with a plurality of self-locking protrusions 12 arranged in a circumferential array, and the inner circumference of the upper port of the detection cylinder section 5 is provided with a plurality of self-locking grooves 13 arranged in a circumferential array. Each of the self-locking protrusions 12 is respectively engaged in the corresponding self-locking grooves 13. The buried cover 2 is fixedly connected to the upper end of the detection cylinder section 5 by a plurality of countersunk bolts 14. Through the design of the self-locking protrusions 12 and the self-locking grooves 13, the buried cover 2 has a self-locking function. After the buried cover 2 is self-locked, the cooperation of the self-locking protrusions 12 and the self-locking grooves 13 can effectively prevent the buried cover 2 from loosening.

[0042] In this embodiment, the length of the buried main tube 1 is 340mm, and the length of the buried extension tube 3 is 178mm. Therefore, in actual use, the following situations may occur:

[0043] In scenario A, when the depth of the underground gas pipeline is less than 340+178mm, the underground gas pipeline is relatively shallow: the underground main tube 1 does not need to be spliced ​​with the underground extension tube 3, that is, the underground protection device 17 does not need to be extended.

[0044] In scenario B, when the depth of the underground gas pipeline is greater than 340+178mm and less than 340+2*178mm, the underground gas pipeline is relatively deep: an underground extension tube 3 is spliced ​​to the lower end of the underground main tube 1, thereby extending the length of the underground protection device 17.

[0045] In scenario C, when the depth of the underground gas pipeline is greater than 340+2*178mm and less than 340+3*178mm, the underground gas pipeline is very deep: two underground extension cylinders 3 are spliced ​​together at the lower end of the underground main cylinder 1, so that the length of the underground protection device 17 is further spliced ​​and extended.

[0046] Similarly, as the depth of the buried gas pipeline increases, the buried extension tube 3 can be spliced ​​to make the length of the buried protection device 17 longer to meet the requirements of different burial depths.

[0047] The installation process of the underground protection device 17 is as follows: (1) Drill a hole slightly larger than the underground protection device 17 on one side of the ground 16 using a water drill, located above the underground gas pipeline; (2) Backfill with sand and gravel to a suitable height and compact the hole; (3) Install the underground protection device 17 into the hole; (4) Backfill and harden the road surface to form a hardened road surface 15; (5) Place the gas detector 4 and install the underground cover 2. After the underground protection device 17 is installed, as follows Figure 8 As shown.

[0048] When the gas detector 4 needs maintenance, the underground cover 2 can be removed to take out the gas detector 4, which is convenient and quick.

[0049] The function of the underground protection device 17 is: on the one hand, to install the gas detector 4, and on the other hand, to prevent the drilled hole from collapsing and being buried, thus affecting the gas detection.

[0050] In other embodiments, the upper end of the buried extension tube 3 is integrally formed with a splicing tube section 11, the outer diameter of the splicing tube section 11 is the same as the inner diameter of the lower port of the buried main tube 1 and the inner diameter of the lower port of the buried extension tube 3; the upper end of the bottomed dustproof net tube 7 and the upper and lower ends of the bottomless dustproof net tube 8 are integrally formed with reinforcing rings 9, and the reinforcing rings 9 are provided with a plurality of first threaded holes arranged in a circular array along the radial direction, and the locking bolts 10 are threadedly installed in the first threaded holes; the upper and lower end sidewalls of the buried main tube 1 and the upper and lower end sidewalls of the buried extension tube 3 are provided with a plurality of second threaded holes arranged in a circular array.

[0051] When the underground main tube 1 and the underground extension tube 3 are spliced, the splicing tube section 11 at the upper end of the underground extension tube 3 is inserted into the lower port of the underground main tube 1. A bottomless dustproof net tube 8 is fitted onto the underground main tube 1. Each of the first threaded holes on the reinforcing ring 9 at the lower end of the bottomless dustproof net tube 8 corresponds one-to-one with each of the second threaded holes on the lower side wall of the underground main tube 1. The inner ends of each of the locking bolts 10 on the reinforcing ring 9 at the lower end of the bottomless dustproof net tube 8 are screwed into each of the second threaded holes on the lower side wall of the underground main tube 1. The lower end of the bottomless dustproof net tube 8... The inner ends of each of the locking bolts 10 on the reinforcing ring 9 press tightly against the outer circle of the splicing section 11 at the upper end of the buried extension tube 3, so that the buried extension tube 3 is fixedly connected to the buried main tube 1. At the same time, each of the first threaded holes on the upper reinforcing ring 9 of the bottomless dustproof net tube 8 corresponds one-to-one with each of the second threaded holes on the upper side wall of the buried main tube 1. The inner ends of each of the locking bolts 10 on the upper reinforcing ring 9 of the bottomless dustproof net tube 8 are screwed into each of the second threaded holes on the upper side wall of the buried main tube 1, so that the bottomless dustproof net tube 8 is fixed on the buried main tube 1.

[0052] When the two underground extension tubes 3 are spliced ​​together, the splicing tube section 11 at the upper end of the lower underground extension tube 3 is inserted into the lower port of the upper underground extension tube 3. A bottomless dustproof net tube 8 is fitted onto the upper underground extension tube 3. Each of the first threaded holes on the reinforcing ring 9 at the lower end of the bottomless dustproof net tube 8 corresponds one-to-one with each of the second threaded holes on the lower side wall of the upper underground extension tube 3. The inner ends of each locking bolt 10 on the reinforcing ring 9 at the lower end of the bottomless dustproof net tube 8 are screwed into each of the second threaded holes on the lower side wall of the upper underground extension tube 3. The inner ends of the locking bolts 10 on the lower reinforcing ring 9 are pressed against the outer circle of the splicing section 11 at the upper end of the lower buried extension tube 3, so that the two buried extension tubes 3 are fixedly connected. At the same time, the first threaded holes on the upper reinforcing ring 9 of the bottomless dustproof net tube 8 correspond one-to-one with the second threaded holes on the upper side wall of the upper buried extension tube 3. The inner ends of the locking bolts 10 on the upper reinforcing ring 9 of the bottomless dustproof net tube 8 are screwed into the second threaded holes on the upper side wall of the upper buried extension tube 3, so that the bottomless dustproof net tube 8 is fixed on the upper buried extension tube 3.

[0053] When the bottom dustproof net cylinder 7 is fitted onto the underground main cylinder 1 or the underground extension cylinder 3, each of the first threaded holes on the bottom dustproof net cylinder 7 corresponds one-to-one with each of the second threaded holes on the upper side wall of the underground main cylinder 1 or the underground extension cylinder 3. The inner ends of each of the locking bolts 10 on the bottom dustproof net cylinder 7 are screwed into each of the second threaded holes on the upper side wall of the underground main cylinder 1 or the underground extension cylinder 3, so that the bottom dustproof net cylinder 7 is fixed onto the underground main cylinder 1 or the underground extension cylinder 3.

[0054] The above method can achieve the installation of the bottomless dustproof net cylinder 8, while also splicing and installing the corresponding underground extension cylinder 3 except for the bottommost one.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A modular, extendable underground protective device, comprising an underground main tube and an underground top cover, characterized in that: It also includes an underground extension tube, which is spliced ​​to the lower end of the underground main tube to increase the length of the underground protection device and thus adapt to the burial depth requirements; both the underground main tube and the underground extension tube are open-ended cylinders; the upper end of the underground main tube is integrally formed with a detection cylinder section for internal installation and protection of the gas detector; the underground cover is detachably installed on the upper end of the detection cylinder section to seal the upper port of the detection cylinder section so as to protect the gas detector when buried.

2. The extendable underground protection device according to claim 1, characterized in that: Both the underground main tube and the underground extended tube have several ventilation holes on their bodies.

3. The extendable underground protection device according to claim 2, characterized in that: It also includes bottomed dustproof net cylinders and bottomless dustproof net cylinders for preventing sand and gravel from entering the underground protection device; both the bottomed dustproof net cylinder and the bottomless dustproof net cylinder are equipped with several locking bolts; When the underground main tube is not spliced ​​with the underground extension tube, the bottom dustproof net tube is fitted onto the underground main tube from bottom to top and can be fixedly connected to the underground main tube by a number of corresponding locking bolts. The bottomless dustproof net tube is reserved as a spare part. When the underground main tube is spliced ​​with an underground extension tube, the bottom dustproof net tube is fitted onto the underground extension tube from bottom to top and can be fixedly connected to the underground extension tube by a number of corresponding locking bolts; the bottomless dustproof net tube is fitted onto the underground main tube and can be fixedly connected to the underground main tube by a number of corresponding locking bolts. When the underground main tube is spliced ​​with multiple underground extension tubes, the bottom dustproof net tube is fitted onto the bottommost underground extension tube from bottom to top and can be fixedly connected to the bottommost underground extension tube by a number of corresponding locking bolts. One bottomless dustproof net tube is fitted onto the underground main tube and all the underground extension tubes except the bottommost one. Each bottomless dustproof net tube can be fixed onto the underground main tube and all the underground extension tubes except the bottommost one by a number of corresponding locking bolts.

4. The extendable underground protection device according to claim 3, characterized in that: The upper end of the underground extension tube is integrally formed with a splicing tube section. The outer diameter of the splicing tube section is the same as the inner diameter of the lower end of the underground main tube and the inner diameter of the lower end of the underground extension tube. The outer circle of the splicing tube section is provided with an external thread, and the inner circle of the lower end of the underground main tube and the inner circle of the lower end of the underground extension tube are both provided with internal threads that cooperate with the external threads. When the underground main tube and the underground extension tube are spliced ​​together, the splicing section at the upper end of the underground extension tube is threadedly connected to the lower port of the underground main tube through the combination of external and internal threads. When the two underground extension tubes are spliced ​​together, the splicing tube section at the upper end of the lower underground extension tube is threadedly connected to the lower port of the upper underground extension tube through the combination of external and internal threads.

5. The extendable underground protection device according to claim 3, characterized in that: The upper end of the underground extension tube is integrally formed with a splicing tube section, the outer diameter of which is the same as the inner diameter of the lower port of the underground main tube and the inner diameter of the lower port of the underground extension tube; the upper end of the bottomed dustproof net tube and the upper and lower ends of the bottomless dustproof net tube are integrally formed with reinforcing rings, and the reinforcing rings are provided with a plurality of first threaded holes arranged in a circular array along the radial direction, and the locking bolts are threaded in the first threaded holes; the upper and lower end sidewalls of the underground main tube and the upper and lower end sidewalls of the underground extension tube are provided with a plurality of second threaded holes arranged in a circular array. When the underground main tube and the underground extension tube are spliced ​​together, the splicing section at the upper end of the underground extension tube is inserted into the lower end of the underground main tube. A bottomless dustproof net tube is fitted onto the underground main tube. Each of the first threaded holes on the reinforcing ring at the lower end of the bottomless dustproof net tube corresponds one-to-one with each of the second threaded holes on the lower side wall of the underground main tube. The inner ends of each locking bolt on the reinforcing ring at the lower end of the bottomless dustproof net tube are screwed into each of the second threaded holes on the lower side wall of the underground main tube. The inner ends of each of the locking bolts on the end reinforcing ring are pressed tightly against the outer circle of the splicing section at the upper end of the buried extension tube, so that the buried extension tube is fixedly connected to the buried main tube. At the same time, each of the first threaded holes on the upper end reinforcing ring of the bottomless dustproof net tube corresponds one-to-one with each of the second threaded holes on the upper side wall of the buried main tube. The inner ends of each of the locking bolts on the upper end reinforcing ring of the bottomless dustproof net tube are screwed into each of the second threaded holes on the upper side wall of the buried main tube, so that the bottomless dustproof net tube is fixed on the buried main tube. When the two underground extension tubes are spliced ​​together, the splicing section at the upper end of the lower underground extension tube is inserted into the lower port of the upper underground extension tube. A bottomless dustproof net tube is fitted onto the upper underground extension tube. The first threaded holes on the reinforcing ring at the lower end of the bottomless dustproof net tube correspond one-to-one with the second threaded holes on the lower sidewall of the upper underground extension tube. The inner ends of the locking bolts on the reinforcing ring at the lower end of the bottomless dustproof net tube are screwed into the second threaded holes on the lower sidewall of the upper underground extension tube. The bottomless dustproof net tube... The inner ends of the locking bolts on the reinforcing ring at the lower end of the net cylinder are pressed tightly against the outer circle of the splicing section at the upper end of the buried extension cylinder on the lower side, so that the two buried extension cylinders are fixedly connected. At the same time, the first threaded holes on the reinforcing ring at the upper end of the bottomless dustproof net cylinder correspond one-to-one with the second threaded holes on the upper side wall of the buried extension cylinder on the upper side. The inner ends of the locking bolts on the reinforcing ring at the upper end of the bottomless dustproof net cylinder are screwed into the second threaded holes on the upper side wall of the buried extension cylinder on the upper side, so that the bottomless dustproof net cylinder is fixed on the buried extension cylinder on the upper side. When the bottom dustproof net cylinder is fitted onto the underground main cylinder or the underground extension cylinder, each of the first threaded holes on the bottom dustproof net cylinder corresponds one-to-one with each of the second threaded holes on the upper side wall of the underground main cylinder or the underground extension cylinder. The inner ends of each of the locking bolts on the bottom dustproof net cylinder are screwed into each of the second threaded holes on the upper side wall of the underground main cylinder or the underground extension cylinder, so that the bottom dustproof net cylinder is fixed onto the underground main cylinder or the underground extension cylinder.

6. The extendable underground protection device according to any one of claims 1-5, characterized in that: The lower outer circumference of the buried cover is provided with a number of self-locking protrusions arranged in a circular array, and the inner circumference of the upper port of the detection cylinder is provided with a number of self-locking grooves arranged in a circular array. Each of the self-locking protrusions is respectively engaged in the corresponding self-locking groove. The buried cover is fixedly connected to the upper end of the detection cylinder by a number of countersunk bolts.

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