Recyclable road subgrade settlement monitoring device

Abstract

The utility model discloses a recoverable road subgrade settlement monitoring device, which belongs to the field of road engineering monitoring and comprises a base and a plurality of sections of settlement pipes connected end to end, a connecting cylinder is fixed on the base, and the lower end of the first section of settlement pipe is inserted into the connecting cylinder. An elastic locking piece and a traction piece for driving a locking part of the elastic locking piece to move in the radial direction of the settlement pipe are fixed to the inner side of the first-section settlement pipe, and a through hole allowing the locking part of the elastic locking piece to penetrate through is formed in the pipe wall of the first-section settlement pipe; a clamping groove matched with the locking portion of the elastic locking piece is formed in the inner wall of the connecting cylinder, and the traction piece is provided with a traction rope which extends in the axial direction of the settlement pipe and extends out of the upper end of the last settlement pipe. According to the subgrade settlement monitoring device, all the settlement pipes can be recycled, and low cost of subgrade settlement monitoring is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of road engineering monitoring technology, and in particular to a recyclable roadbed settlement monitoring device. Background Technology

[0002] In embankment engineering, in order to keep the subgrade in good working condition, it is necessary to monitor the settlement at various observation points of the subgrade.

[0003] Currently, settlement monitoring of embankment subgrades generally adopts the method of burying settlement tubes. That is, a settlement tube is vertically buried at different observation positions. The lower end of the settlement tube is welded with a base measuring 0.5*0.5m. As the filling is carried out, another section of settlement tube is welded to the upper end of the settlement tube until it is higher than the height of the filling. After the filling is completed, the part of the settlement tube above the filling is used as an observation point and monitored in conjunction with a level or total station. After the monitoring is completed, the settlement tube above the filling layer needs to be manually removed to meet the construction conditions.

[0004] Due to the constraints of the base, settlement pipes that protrude above the backfill layer are usually cut off with tools such as pliers. However, this method results in most of the remaining settlement pipes being buried in the backfill and unable to be retrieved, causing unnecessary waste of steel resources. Furthermore, cutting off a small portion of the settlement pipes also renders them unusable as settlement pipes, significantly increasing the cost of subsequent roadbed settlement monitoring. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a recyclable roadbed settlement monitoring device that enables the complete recycling of settlement pipes, thereby ensuring low-cost roadbed settlement monitoring.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A recyclable roadbed settlement monitoring device includes a base and multiple settlement tubes connected end to end. A connecting cylinder is fixed on the base. The lower end of the first settlement tube is inserted into the connecting cylinder. An elastic locking element and a traction element for driving the locking part of the elastic locking element to move radially along the settlement tube are fixed on the inner side of the first settlement tube. A through hole is opened on the tube wall of the first settlement tube for the locking part of the elastic locking element to pass through. A groove is opened on the inner wall of the connecting cylinder to cooperate with the locking part of the elastic locking element. The traction element has a traction rope extending axially along the settlement tube and extending from the upper end of the last settlement tube. The first section of the settling pipe is inserted into the connecting cylinder of the base and is fixed to the connecting cylinder by an elastic locking device. The inner diameter of the settling pipe matches the outer diameter of the connecting cylinder, making the installation of the settling pipe quick and stable. When it is necessary to remove the settling pipe, pulling the traction rope located on the outside of the last settling pipe will cause the locking part of the elastic locking device to disengage from the slot of the connecting cylinder. Then, the entire settling pipe can be pulled out manually or with the help of lifting tools to complete the recovery of the settling pipe, which greatly reduces the cost of the monitoring project.

[0008] The elastic locking component includes at least two symmetrically arranged elastic springs. One end of each elastic spring is fixed to the inner wall of the first section of the settling pipe, and the other end of each elastic spring is formed with a pin that serves as the locking part. The traction component is a guide seat fixed to the lower end of the first section of the settling pipe. The guide seat has a guide rope channel corresponding to the position of the pin. The front section of the traction rope has multiple strands that pass through the guide rope channel and connect to the back side of the pin.

[0009] Below the guide seat is a connecting seat that is threaded to the first section of the settling pipe. The connecting seat is rotatably connected to the middle of the guide seat via a rotating shaft. The guide seat is detachably connected to the first section of the connecting cylinder via the connecting seat, which facilitates installation and maintenance. Furthermore, the rotatable connection between the guide seat and the connecting seat ensures that the guide rope channel of the guide seat always corresponds to the elastic spring during installation.

[0010] The two adjacent settling pipes are connected by an inner sleeve. The upper and lower ends of the inner sleeve are respectively arranged with multiple upper locking bolts and lower locking bolts along the circumference. The upper locking bolts and lower locking bolts pass through the corresponding settling pipes and are threadedly connected to the inner sleeve.

[0011] Includes a prism, the bottom of which is fixed with a connecting threaded post, which is connected to a first internal thread portion opened at the upper end of the final section of the settling pipe.

[0012] The system comprises multiple traction ropes, the number of which is the same as the number of settlement pipes. The traction ropes in adjacent settlement pipes are connected by buckles. When adjacent settlement pipes are joined, the traction ropes in each pipe are connected, eliminating the need for threading individual traction ropes from bottom to top and improving the ease of installation.

[0013] It includes multiple protective sleeves connected end to end, with the first protective sleeve sleeved on the outside of the connecting cylinder.

[0014] Two adjacent protective sleeves are connected by an external threaded sleeve, and the end of the protective sleeve has a second internal thread that mates with the external threaded sleeve. The protective sleeve is fitted over the settlement pipe to protect it and prevent scratches on the pipe's markings. Since there is no backfill soil pressing around the settlement pipe, retrieval is rapid. The protective sleeve and connecting sleeve can be separated; after the settlement pipe is retrieved, the protective sleeve is pulled out for further retrieval.

[0015] In a preferred embodiment, a lifting sleeve is further included, wherein a pull ring is fixed to the top of the lifting sleeve, and a first external thread is provided on the outside of the lifting sleeve to engage with the first internal thread at the end of the final section of the settling pipe.

[0016] In another preferred embodiment, a lifting sleeve is included. A pull ring is fixed to the top of the lifting sleeve, and the outer side of the lifting sleeve, from bottom to top, has a first external thread that mates with a first internal thread at the end of the final section of the settling pipe and a second external thread that mates with a second internal thread at the end of the final section of the protective sleeve. The lifting sleeve is sequentially connected to the final section of the settling pipe and the final section of the protective sleeve to form an auxiliary lifting component for pulling out the settling pipe and the protective sleeve.

[0017] This utility model has the following advantages: By setting a connecting cylinder on the base to fit and sleeve the first section of the settling pipe, the first section of the settling pipe is fixed to the connecting cylinder by an elastic locking member, thus realizing the quick and stable installation of the settling pipe; when it is necessary to remove the settling pipe, pulling the traction rope located on the outside of the last stage settling pipe can drive the locking part of the elastic locking member to disengage from the slot of the connecting cylinder, and then the entire settling pipe can be pulled out manually or with the help of lifting tools to complete the recovery of the settling pipe, which greatly reduces the cost of monitoring projects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the protective sleeve used when this utility model is used in conjunction with a level instrument;

[0020] Figure 2 This is a schematic diagram of the protective sleeve used when this utility model is used in conjunction with a total station;

[0021] Figure 3This is a schematic diagram of the structure of this utility model without the protective sleeve;

[0022] Figure 4 This is a partial schematic diagram of the connection between the final section of the settling pipe and the plug in this utility model.

[0023] Figure 5 This is a partial schematic diagram of the connection between the final section of the settling pipe and the prism in this utility model;

[0024] Figure 6 This is a cross-sectional schematic diagram of the connection between adjacent settling pipes in this utility model;

[0025] Figure 7 This is a partial schematic diagram of the lower end of the first section of the settling pipe in this utility model;

[0026] Figure 8 This is a schematic diagram of the connection between the guide seat and the connecting seat in this utility model;

[0027] Figure 9 This is a cross-sectional schematic diagram of the connection between the first section of the settling pipe and the connecting cylinder in this utility model;

[0028] Figure 10 This is a schematic diagram showing the fit between the settling pipe and the lifting sleeve in this utility model;

[0029] Figure 11 This is a schematic diagram showing the fit between the protective sleeve and the lifting sleeve in this utility model.

[0030] 1. Base; 2. Connecting cylinder; 201. Slot; 3. Settling pipe; 301. First internal thread; 302. Through-hole; 303. Rope threading hole; 4. Elastic spring; 401. Pin; 5. Guide seat; 501. Guide post; 502. Rope channel; 6. Connecting seat; 7. Traction rope; 701. Branching part; 702. Buckle; 8. Inner sleeve; 801. Upper locking bolt; 802. Lower locking bolt; 9. Prism; 901. Connecting threaded post; 10. Protective sleeve; 1001. Second internal thread; 11. External thread sleeve; 12. Lifting sleeve; 1201. First external thread; 1202. Second external thread; 1203. Pull ring; 13. Plug. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] like Figure 3 As shown, this utility model provides a recyclable roadbed settlement monitoring device, including a base 1 and multiple settlement tubes 3 connected end-to-end. A connecting cylinder 2 is fixed on the base 1. The lower end of the first settlement tube 3 is inserted into the connecting cylinder 2. There is a 1-2mm gap between the outer wall of the first settlement tube 3 and the inner wall of the connecting cylinder 2, allowing the first settlement tube 3 to move circumferentially within the connecting cylinder 2 without causing radial displacement to the greatest extent possible. Figure 7 and Figure 9 As shown, an elastic locking element and a traction element that drives the locking part of the elastic locking element to move radially along the sedimentation pipe 3 are fixed inside the first section of the sedimentation pipe 3. A through-hole 302 is opened on the pipe wall of the first section of the sedimentation pipe 3 for the locking part of the elastic locking element to pass through. A slot 201 that mates with the locking part of the elastic locking element is opened on the inner wall of the connecting cylinder 2. The traction element has a traction rope 7 that extends axially along the sedimentation pipe 3 and extends out from the upper end of the last section of the sedimentation pipe 3. The first section of the sedimentation pipe 3 is inserted into the connecting cylinder 2 of the base 1 and is locked in place by the elastic locking element, thus completing the quick installation of the sedimentation pipe 3. When it is necessary to remove the sedimentation pipe 3, pulling the traction rope 7 located on the outside of the last section of the sedimentation pipe 3 will cause the locking part of the elastic locking element to disengage from the slot 201 of the connecting cylinder 2. Then, the entire sedimentation pipe 3 can be pulled out manually or with the help of a lifting tool, thus completing the recovery of the sedimentation pipe 3 and significantly reducing the cost of the monitoring project.

[0035] Further preferred, such as Figure 6As shown, the elastic locking component includes at least two symmetrically arranged elastic springs 4. One end of each elastic spring 4 is welded to the inner wall of the first section of the sinking pipe 3, and the other end of each elastic spring 4 is formed with a pin 401 serving as the locking part. The traction component is a guide seat 5 fixed to the lower end of the first section of the sinking pipe 3. The guide seat 5 has a guide rope channel 502 corresponding to the position of the pin 401. The front section of the traction rope 7 has a branch section 701 with multiple strands passing through the guide rope channel 502 and connected to the back side of the pin 401. Preferably, there are four elastic springs 4, which are distributed circumferentially in the first section of the sinking pipe 3. The guide seat 5 is formed with four guide posts 501 corresponding to the elastic springs 4 one by one. The guide channel is radially opened in the guide post 501 along the sinking pipe 3. The two sides of the guide channel have an arc surface structure, which can reduce the wear of the rope during the pulling process.

[0036] To facilitate the installation of the guide seat 5 inside the first settling pipe 3, such as Figure 5 As shown, a connecting seat 6 is provided below the guide seat 5 and is threadedly connected to the first section of the settling pipe 3. The connecting seat 6 is rotatably connected to the middle of the guide seat 5 via a rotating shaft 601. Specifically, a bearing that cooperates with the rotating shaft 601 is embedded in the connecting seat 6. The upper end of the rotating shaft 601 is welded or threaded to the bottom of the guide seat 5 to ensure that the connecting seat 6 can rotate relative to the guide seat 5 during installation, so that the rope channel 502 of the guide seat 5 always corresponds to the elastic spring 4.

[0037] like Figure 1 and Figure 6 As shown, two adjacent settling pipes 3 are connected by an inner sleeve 8. The upper and lower ends of the inner sleeve 8 are respectively arranged with multiple upper locking bolts 801 and lower locking bolts 802 along the circumference. The inner sleeve 8 first passes through the lower settling pipe 3 through the lower locking bolt 802 and is threaded, and then passes through the upper settling pipe 3 through the upper locking bolt 801 and is threaded. More preferably, the through hole on the settling pipe 3 is a countersunk hole, so that the end face of each locking bolt after locking is flush with or slightly concave with the outer surface of the settling pipe. Compared with the existing method of welding and fixing two settling pipes 3, the detachable method facilitates the recycling of the settled pipe 3 after recovery. Moreover, the fixed-point connection of the bolts does not require the settling pipe 3 to be rotated, so that the traction rope 7 can be stably erected on the outer side of the upper end of the last settling pipe 3.

[0038] More preferably, there are multiple traction ropes 7, the number of which is the same as the number of settlement pipes 3. The traction ropes 7 in two adjacent settlement pipes 3 are connected by a buckle 702. That is, when adjacent settlement pipes 3 are joined, the traction rope 7 in the previous section of settlement pipe 3, which is already fixed in the soil layer, is laid on the outside of the settlement pipe 3. This is the first section of traction rope 7. In the next section of settlement pipe 3, the second section of traction rope 7 is laid down from top to bottom. Figure 6As shown, the next traction rope 7 is attached to the buckle 702 on the previous traction rope 7, thus eliminating the need for the single traction rope 7 to always be threaded through the pipe from bottom to top, improving the ease of installation.

[0039] To protect the settling pipe 3, such as Figure 1 and Figure 2 As shown, the protection method adopts a protective sleeve 10 sleeved outside the settlement pipe 3. That is, this device also includes multiple protective sleeves 10 connected end to end. The first protective sleeve 10 is sleeved on the outside of the connecting cylinder 2. More preferably, two adjacent protective sleeves 10 are connected by an external threaded sleeve 11, such as... Figure 11 As shown, the protective sleeve 10 has a second internal thread 1001 at its end that mates with the external threaded sleeve 11. The upper end of the last section of the protective sleeve 10 is more than 30cm above the soil layer and more than 50cm below the upper end of the last section of the settlement pipe 3, so that the outer scale of the settlement pipe 3 is exposed to monitor the settlement data with a level instrument. The protective sleeve 10 provides protection for the settlement pipe 3, effectively preventing scratches on the scale of the settlement pipe 3, reducing the pressure of the soil on the periphery of the settlement pipe 3, and enabling rapid recovery of the settlement pipe 3. After the settlement pipe 3 is recovered, since the protective sleeve 10 and the connecting cylinder 2 are directly separated, the protective sleeve 10 can also be pulled out for recovery.

[0040] Further optimized, to facilitate the recovery of the settlement pipe 3 and the protective sleeve 10 by the operators and to better apply force, such as Figure 10 and Figure 11 As shown, this device also includes a lifting sleeve 12, with a pull ring 1203 fixed to the top of the lifting sleeve 12. The upper end of the final section of the settling pipe 3 has a first internal thread 301, and the upper end of the final section of the protective sleeve 10 has a second internal thread 1001. The outer side of the lifting sleeve 12, from bottom to top, has a first external thread 1201 that mates with the first internal thread 301 and a second external thread 1202 that mates with the second internal thread 1001. After the lifting sleeve 12 is connected to the final section of the settling pipe 3, the pull ring 1203... As the force-applying part for lifting the entire settling pipe 3, preferably, in order to facilitate the operation of the traction rope 7 after the lifting sleeve 12 and the last settling pipe 3 are connected, the upper end of the last settling pipe 3 is provided with a rope-passing port 303, and the distance between the rope-passing port 303 and the upper end of the last settling pipe 3 is slightly greater than the height of the internal thread in the last settling pipe; after the lifting sleeve 12 is connected to the last protective sleeve 10, the pull ring 1203 serves as the force-applying part for lifting the entire protective sleeve 10, and the settling pipe 3 and the protective sleeve 10 can be lifted quickly as a whole through the pull ring 1203.

[0041] When using this device for monitoring, the scale on the settlement pipe 3 can be directly observed using a level, or the scale on the leveling rod placed above the settlement pipe 3 can be observed using a level. In this case, if... Figure 1 and Figure 4As shown, a plug can be installed at the upper end of the final settlement pipe 3 by threading to cooperate with the erection of the tower gauge. The settlement difference is obtained by comparing the new observation data with the first observation data, and the rate of change and curve are obtained by comparing with the previous data, so as to provide a reference for subsequent engineering construction.

[0042] This device can also be used in conjunction with a total station by adding a prism 9 to the final settlement pipe 3. By comparing the newly observed data with the data from the first observation, the difference in lateral displacement and settlement can be calculated, and the rate of change and curves can be obtained by comparing them with previous data, providing a reference for subsequent engineering construction; specifically, such as... Figure 2 and Figure 5 As shown, a connecting threaded post 901 is fixed at the bottom of the prism 9, and the connecting threaded post 901 is threadedly connected to the first internal thread 301 at the upper end of the last section of the settling pipe 3.

[0043] To avoid squeezing of the traction rope 7 when the threaded post 901 is connected to the upper end of the last section of the settling pipe 3, or when the plug 9 is connected to the upper end of the last section of the settling pipe 3, such as Figure 4 and Figure 5 As shown, the distance between the rope-threading port 303 located at the upper end of the last section of the settling pipe 3 and the upper end of the last section of the settling pipe 3 is slightly greater than the length of the last section of the settling pipe 3 used to connect with the connecting threaded column 9 / plug 13.

[0044] Implementing the above technical solution, the base 1 is made of steel plate with dimensions of 400*400*10mm, the connecting cylinder 2 is made of galvanized steel pipe with a length of 200mm and a size of DN60*9mm, the settling pipe 3 is made of galvanized steel pipe with a length of 1000mm per section and a size of DN40*3.5mm, and is laser-engraved with scale lines along the axial direction. The settling pipe is divided into three specifications: the first settling pipe section, the middle settling pipe section, and the last settling pipe section. The inner sleeve section 8 is made of galvanized steel pipe with a length of 100mm and a size of DN32*3mm. The galvanized steel pipe has a 1mm annular gap between the settlement pipe 3 and the connecting cylinder 2, and a 0.5mm annular gap between the settlement pipe 3 and the inner sleeve 8. If a protective sleeve 10 is required, a galvanized steel pipe with a size of DN75*5mm is selected. The protective sleeve 10 comes in three specifications: one with a length of 500mm, one with a length of 1000mm, and a small number with a length of 300mm, to ensure the protection of the settlement pipe during roadbed filling and to meet the needs of normal observation. Both the external threaded sleeve 11 and the lifting sleeve 12 use M65 threaded sleeves. The matching pipe with external thread, wherein the length of the external thread sleeve 11 is not less than 120mm, and the lower end of the lifting sleeve 12 is machined with an M33 external thread section, each thread not less than 60mm; the groove 201 on the inner wall of the connecting cylinder 2 can be made by first machining four opposing through holes, and then spot welding the outside of the through holes to seal them; four elastic springs 4 are welded circumferentially to the inner side of the first section of the settling pipe 3, and a rope hook for hanging rope is spot welded to the back side of the pin 401, and each branch of the traction rope 7 701 passes through the guide post 5. After 01, it is connected to each rope hook. The end of the traction rope 7 is placed on the outer side of the upper end of the first settlement section. The connecting seat 6 is screwed onto the lower end of the first settlement pipe 3. The connecting cylinder 2 is vertically welded to the center of the bottom plate to form the initial settlement plate. The assembled first settlement pipe 3 is inserted into the connecting cylinder 2, and the settlement pipe 3 is rotated until the pin 401 falls into the slot 201. As the filling operation proceeds, settlement pipes 3 and traction ropes 7 are added section by section. The end of the traction rope 7 is placed on the outer side of the last settlement pipe 3. After the filling is completed, if it is necessary to cooperate with the level instrument, such as Figure 1 As shown, the scale on settlement pipe 3 above the soil layer is observed directly using a level; if it needs to be used in conjunction with a total station, such as Figure 2 As shown, a prism 9 is installed on the upper end of the final settlement pipe 3. After monitoring, the prism 9 is removed, the lifting sleeve 12 is installed, the traction rope 7 is pulled to a certain distance and fixed, and the settlement pipe is pulled upward by the pull ring 1103 on the lifting sleeve 12 for about 2-3 cm. At this time, the pin 401 of the elastic spring 4 is completely disengaged from the groove 201 on the inner side of the connecting cylinder 2. The traction rope 7 is released, and the settlement pipe 3 is pulled up until all the settlement pipes 3 are pulled out of the soil layer. The inner sleeve 8 is removed one by one, and each settlement pipe 3 is separated for recycling. The lifting sleeve 12 is installed on the final protective sleeve 10, and all the protective sleeves 10 are pulled out. Each protective sleeve 10 and the external threaded sleeve 11 are separated. The separated components are cleaned for subsequent settlement monitoring.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A recyclable roadbed settlement monitoring device, comprising a base and multiple sections of settlement pipe connected end-to-end, characterized in that, A connecting cylinder is fixed on the base. The lower end of the first section of the settling pipe is inserted into the connecting cylinder. An elastic locking member and a traction member that drives the locking part of the elastic locking member to move radially along the settling pipe are fixed on the inner side of the first section of the settling pipe. A through hole is opened on the pipe wall of the first section of the settling pipe for the locking part of the elastic locking member to pass through. A groove is opened on the inner wall of the connecting cylinder to cooperate with the locking part of the elastic locking member. The traction member has a traction rope that extends axially along the settling pipe and extends out from the upper end of the last section of the settling pipe.

2. The recyclable roadbed settlement monitoring device according to claim 1, characterized in that, The elastic locking component includes at least two symmetrically arranged elastic springs. One end of each elastic spring is fixed to the inner wall of the first section of the settling pipe, and the other end of each elastic spring is formed with a pin that serves as the locking part. The traction component is a guide seat fixed to the lower end of the first section of the settling pipe. The guide seat has a guide rope channel corresponding to the position of the pin. The front section of the traction rope has multiple strands that pass through the guide rope channel and connect to the back side of the pin.

3. The recyclable roadbed settlement monitoring device according to claim 2, characterized in that, The guide seat is provided with a connecting seat that is threadedly connected to the first section of the settling pipe below it. The connecting seat is rotatably connected to the middle of the guide seat via a rotating shaft.

4. A recyclable roadbed settlement monitoring device according to any one of claims 1-3, characterized in that, The two adjacent settling pipes are connected by an inner sleeve. The upper and lower ends of the inner sleeve are respectively arranged with multiple upper locking bolts and lower locking bolts along the circumference. The upper locking bolts and lower locking bolts pass through the corresponding settling pipes and are threadedly connected to the inner sleeve.

5. A recyclable roadbed settlement monitoring device according to claim 4, characterized in that, Includes a prism, the bottom of which is fixed with a connecting threaded post, which is connected to a first internal thread portion opened at the upper end of the final section of the settling pipe.

6. A recyclable roadbed settlement monitoring device according to any one of claims 1-3, characterized in that, There are multiple traction ropes, the number of which is the same as the number of settling pipes. The traction ropes in two adjacent settling pipes are connected by buckles.

7. A recyclable roadbed settlement monitoring device according to any one of claims 1-3, characterized in that, It includes multiple protective sleeves connected end to end, with the first protective sleeve sleeved on the outside of the connecting cylinder.

8. A recyclable roadbed settlement monitoring device according to claim 7, characterized in that, Two adjacent protective sleeves are connected by an external threaded sleeve, and the end of the protective sleeve has a second internal thread that mates with the external threaded sleeve.

9. A recyclable roadbed settlement monitoring device according to any one of claims 1-3, characterized in that, It includes a lifting sleeve, the top of which is fixed with a pull ring, and the outer side of the lifting sleeve is provided with a first external thread that mates with the first internal thread at the end of the final section of the settling pipe.

10. A recyclable roadbed settlement monitoring device according to claim 7, characterized in that, The device includes a lifting sleeve, with a pull ring fixed to the top of the lifting sleeve. The outer side of the lifting sleeve is provided with a first external thread that mates with the first internal thread at the end of the final section of the settling pipe and a second external thread that mates with the second internal thread at the end of the final section of the protective sleeve, from bottom to top.

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