A method for judging entry of a steel casing into rock

Abstract

This invention provides a method for determining rock penetration of a steel casing, belonging to the field of construction technology. It includes a steel casing, a turntable threaded to the top of the steel casing, and connecting components, with four connecting components arranged in a ring array on the bottom side of the turntable. This invention, through the structural cooperation of the turntable, connecting components, and a second detection component, facilitates the determination of rock penetration at the bottom of the steel casing. A top rod contacts and presses against a movable block, causing the movable block to move downwards and pull a third rope. The third rope pulls a locking block, causing a fourth spring to retract, disengaging the locking block from the steel casing. The elastic force of the second spring pulls a second detection head downwards rapidly. The second detection head passes through a fixed hole, and a sensor inside the second detection head detects the distance it moves. If the second detection head contacts the rock mass, and the distance it moves is short, it is determined that the bottom of the steel casing has penetrated the rock; otherwise, it is determined that it has not penetrated the rock.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for determining whether a steel casing has entered rock. Background Technology

[0002] A steel casing is a steel structure used to protect bored piles, typically employed during manual excavation. Due to unstable soil conditions and the difficulty of constructing reinforced concrete retaining walls, steel casings are used to protect the bored piles, prevent collapse, and avoid impacting construction progress and safety. The use of steel casings often requires penetration into rock, and the depth of penetration determines the stability and degree of protection provided by the casing. If the steel casing does not penetrate the rock, the bored pile may not be adequately protected, making it prone to collapse and requiring additional construction steps, such as deepening the borehole and re-inserting the steel casing. This significantly impacts construction efficiency; therefore, it is necessary to determine whether the steel casing has penetrated the rock.

[0003] In the prior art, the rock penetration judgment of steel casing is mostly made manually during drilling, based on the drilling depth or rock powder produced during drilling. Although this method is simple, it is easily affected by factors such as the curvature of the borehole, the length of the drill rod, and the drilling speed. Furthermore, it requires a certain level of experience from the operator, which can easily lead to errors in judgment. Therefore, this application provides a method for judging the rock penetration of steel casing to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for judging the entry of steel casing into rock, so as to solve the problem that the existing method of judging by human experience is prone to errors.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for determining rock ingress of a steel casing includes a steel casing and further includes: a turntable threadedly connected to the top of the steel casing; a connecting assembly, with the top ends of four connecting assemblies arranged in a ring array on the bottom side of the turntable; a first detection assembly installed in the middle of the connecting assembly for determining rock ingress on the side of the steel casing; and a second detection assembly located at the bottom of the connecting assembly for determining rock ingress at the bottom of the steel casing.

[0007] Optionally, the connecting assembly includes a first connecting rod, the bottom end of which is fixedly connected to a third connecting rod via a second connecting rod, a connecting block is provided in the middle of the second connecting rod, and a top rod is fixedly connected to the bottom of the third connecting rod; the first detection assembly includes a limiting block and a first spring, the limiting block having a right-angled triangular structure, a first detection head fixedly connected to one side of the limiting block, the two ends of the first spring being elastically connected to the steel casing and the first detection head respectively, and the other side of the limiting block being slidably connected to the support bar; the limiting block further includes a triangular block, one side of which... A limiting groove is formed, and a limiting strip is fixedly connected to the side of the limiting groove near the first detection head; the second detection component includes a movable block, a second spring, and a fourth spring. The movable block is sleeved in the middle of the second detection head. The two ends of the second spring are elastically connected to the second detection head and the steel protective cylinder, respectively. The top side of the movable block is fixedly connected to one end of a third pull rope in a ring array. The other end of the third pull rope is fixedly connected to a locking block. The two ends of the fourth spring are elastically connected to the locking block and the second detection head, respectively; sensors for detecting movement distance are installed inside both the first and second detection heads.

[0008] Optionally, the connecting assembly further includes a first pull rope fixed to the bottom end of the top rod, with a gravity ball at the end of the first pull rope away from the top rod, and the side of the gravity ball away from the top rod fixed to one end of a second pull rope. The other end of the second pull rope is fixed to a movable block, and a tension sensor is provided on the movable block. The steel casing can be either inclined or vertical.

[0009] Optionally, the bottom side of the turntable is rotatably connected to one end of the bellows, the bellows is located at the outer end of the first connecting rod, the other end of the bellows is fixed to the steel casing, the connecting assembly is movably installed on the steel casing, both ends of the support bar are fixed to the steel casing, the triangular block and the support bar are movably connected to the middle of the second connecting rod, and the connecting block is movably connected in the limiting groove.

[0010] Optionally, the outer circumferential surface of the steel casing is provided with an annular array of through holes for the first detection head to pass through. The side of the first detection head away from the limiting block has a pointed conical structure, and the first spring is sleeved on the outer end of the first detection head.

[0011] Optionally, the bottom of the steel casing has a ring array of fixing holes for the second detection head to pass through, and the outer edge of the second detection head is movably connected to the steel casing.

[0012] Optionally, the outer side of the locking block is slidably connected to the second detection head, the end of the locking block away from the third pull rope is engaged with the steel protective cylinder, and the fourth spring is sleeved on the outer end of the third pull rope.

[0013] Optionally, when the steel casing is tilted, the third connecting rod tilts, the gravity ball pulls the first rope to remain vertical by gravity, and the gravity ball can pull the tension sensor on the movable block by the second rope.

[0014] Optionally, when the steel casing is vertical, the third connecting rod is also vertical, and the gravity of the gravity ball will not pull the second rope.

[0015] Optionally, the second detection head has a limiting hole in the middle that matches the push rod, and the push rod is located directly above the movable block.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above scheme, the device facilitates the judgment of rock penetration at the bottom of the steel casing by setting up a turntable, connecting components, and a second detection component. After the steel casing is placed and installed, rotating the turntable can squeeze the connecting component downwards. The top rod contacts and squeezes the movable block downwards. The movable block moves downwards and pulls the third rope. The third rope pulls the locking block, causing the fourth spring to retract. The locking block is no longer locked to the steel casing. The elastic force of the second spring pulls the second detection head downwards quickly. The second detection head passes through the fixing hole. The sensor set inside the second detection head detects the movement distance of the second detection head. The sensor transmits the data to the backend via wireless signal. If the second detection head contacts the rock mass, the movement distance of the second detection head is short, and it is judged that the bottom of the steel casing has penetrated the rock; otherwise, it is judged that it has not penetrated the rock.

[0018] By incorporating a turntable, connecting components, and a first detection component, the device facilitates rock entry detection from the side of the steel casing. A first connecting rod drives a second connecting rod downwards, which in turn moves a connecting block. The connecting block slides downwards along a limiting strip. When the connecting block reaches the bottom of the limiting strip, the spring force pulls the first detection head through the through-hole. The first detection head then pulls the limiting block outwards. A sensor inside the first detection head detects its movement distance and transmits the data wirelessly to the backend. If the first detection head contacts the rock mass, a shorter movement distance indicates rock entry from the side of the steel casing; otherwise, it indicates no rock entry.

[0019] The device, through the combination of a first pull rope, a gravity ball, a second pull rope, and a movable block, facilitates the determination of the verticality of the steel casing installation. When the steel casing is placed in the pit, if it tilts, the gravity ball pulls the first pull rope to maintain its verticality. Conversely, the second pull rope, when tilted, is tightened by the gravity ball. This tightened rope activates a tension sensor inside the movable block, which transmits data wirelessly to the control panel. If the steel casing is vertical, the second pull rope is slack and will not activate the tension sensor, thus allowing for the determination of the steel casing's verticality. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0021] Figure 1 A three-dimensional structural schematic diagram of the method for judging the entry of steel casing into rock;

[0022] Figure 2 A three-dimensional cross-sectional schematic diagram of the method for judging the rock penetration of steel casing;

[0023] Figure 3 for Figure 2 Enlarged view of point A;

[0024] Figure 4 for Figure 2 Enlarged view of point B;

[0025] Figure 5 for Figure 2 Enlarged view of point C;

[0026] Figure 6 This is a side sectional view of the connecting component.

[0027] Figure 7 for Figure 6 Enlarged diagram of point D;

[0028] Figure 8 This is a disassembly diagram of the connecting component and the first detection component;

[0029] Figure 9 This is a disassembly diagram of the connecting component and the second detection component.

[0030] [Figure Labels]

[0031] 1. Steel casing; 2. Turntable; 3. Corrugated pipe; 4. Connecting assembly; 401. First connecting rod; 402. Second connecting rod; 403. Third connecting rod; 404. Connecting block; 405. Top rod; 406. First pull rope; 407. Gravity ball; 408. Second pull rope; 5. First detection assembly; 501. Limiting block; 5011. Triangular block; 5012. Limiting groove; 5013. Limiting strip; 502. First detection head; 503. First spring; 504. Support strip; 6. Second detection assembly; 601. Movable block; 602. Second detection head; 603. Second spring; 604. Third pull rope; 605. Locking block; 606. Fourth spring.

[0032] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0033] The method for determining rock penetration of a steel casing provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0034] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0035] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0036] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0037] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0038] like Figure 1 and Figure 9 As shown, an embodiment of the present invention provides a method for determining rock ingress of a steel casing, including a steel casing 1, and further including: a turntable 2, the turntable 2 being threadedly connected to the top end of the steel casing 1; a connecting assembly 4, the top ends of four connecting assemblies 4 being arranged in a circular array on the bottom side of the turntable 2; a first detection assembly 5, the first detection assembly 5 being installed in the middle of the connecting assembly 4 for determining rock ingress on the side of the steel casing 1; and a second detection assembly 6, the second detection assembly 6 being disposed at the bottom end of the connecting assembly 4 for determining rock ingress at the bottom of the steel casing 1.

[0039] The connecting assembly 4 includes a first connecting rod 401, with a third connecting rod 403 fixedly connected to the bottom end of the first connecting rod 401 via a second connecting rod 402. A connecting block 404 is provided in the middle of the second connecting rod 402, and a top rod 405 is fixedly connected to the bottom of the third connecting rod 403. The first detection assembly 5 includes a limiting block 501 and a first spring 503. The limiting block 501 has a right-angled triangular structure. A first detection head 502 is fixedly connected to one side of the limiting block 501. The two ends of the first spring 503 are elastically connected to the steel casing 1 and the first detection head 502, respectively. The other side of the limiting block 501 is slidably connected to the support bar 504. The limiting block 501 also includes a triangular block 5011, with a [missing information - likely a feature or design feature] on one side. A limiting groove 5012 is provided, and a limiting strip 5013 is fixedly connected to one side of the limiting groove 5012 near the first detection head 502. The second detection component 6 includes a movable block 601, a second spring 603, and a fourth spring 606. The movable block 601 is sleeved in the middle of the second detection head 602. The two ends of the second spring 603 are elastically connected to the second detection head 602 and the steel casing 1, respectively. The top side of the movable block 601 is fixedly connected to one end of the third pull rope 604 in a ring array. The other end of the third pull rope 604 is fixedly connected to a locking block 605. The two ends of the fourth spring 606 are elastically connected to the locking block 605 and the second detection head 602, respectively. Sensors for detecting the moving distance are installed in both the first detection head 502 and the second detection head 602.

[0040] By rotating the turntable 2, the connecting assembly 4 is pressed downwards. The top rod 405 contacts and presses the movable block 601 downwards. The movable block 601 moves downwards and pulls the third pull rope 604. The third pull rope 604 pulls the locking block 605, causing the fourth spring 606 to contract. The elastic force of the second spring 603 pulls the second detection head 602 downwards quickly. The sensor installed inside the second detection head 602 detects the movement distance of the second detection head 602. The sensor transmits the data to the backend via wireless signal. If the second detection head 602 contacts the rock mass, the movement distance of the second detection head 602 is short, and it is determined that the bottom of the steel casing 1 has entered the rock mass. Otherwise, it is determined that it has not entered the rock mass. The first connecting rod 401 drives the second connecting rod 402 downwards. The second connecting rod 402 moves, driving the connecting block 404 to slide downward along the limiting block 501. When the connecting block 404 moves to the lowest end of the limiting block 501, the elastic force of the first spring 503 can pull the first detection head 502 through the steel casing 1. The first detection head 502 pulls the limiting block 501 to move outward. The sensor installed inside the first detection head 502 detects the moving distance of the first detection head 502. The sensor transmits the data to the backend through a wireless signal. If the first detection head 502 contacts the rock mass, the moving distance of the first detection head 502 is short, and it is determined that the side of the steel casing 1 has entered the rock. Otherwise, it is determined that it has not entered the rock, so that the device can determine whether the bottom and side walls of the steel casing 1 have entered the rock.

[0041] like Figures 2 to 3 and Figure 9 As shown, the connecting assembly 4 further includes a first pull rope 406 fixed to the bottom end of the top rod 405. A gravity ball 407 is provided at the end of the first pull rope 406 away from the top rod 405. The side of the gravity ball 407 away from the top rod 405 is fixed to one end of a second pull rope 408. The other end of the second pull rope 408 is fixed to a movable block 601. A tension sensor is provided on the movable block 601. The steel casing 1 can be tilted or vertical. When the steel casing 1 is tilted, the third connecting rod 403 tilts, and the gravity ball 407 pulls the first pull rope 406 to remain vertical due to gravity. The gravity ball 407 can also pull the tension sensor on the movable block 601 via the second pull rope 408. When the steel casing 1 is vertical, the third connecting rod 403 tilts. When the connecting rod 403 is vertical, the gravity of the gravity ball 407 will not pull the second rope 408. When the steel casing 1 is installed in the pit, if the steel casing 1 tilts, the gravity of the gravity ball 407 can pull the first rope 406 to keep it vertical, while the second rope 408 will tilt. The gravity of the gravity ball 407 can make the second rope 408 taut. The second rope 408 can pull the tension sensor installed inside the movable block 601. The tension sensor transmits data to the backend via wireless signal. If the steel casing 1 is vertical, the second rope 408 is in a slack state and will not pull the tension sensor, thus enabling the judgment of the verticality of the steel casing 1 installation.

[0042] like Figure 2 , Figures 4 to 8As shown, the bottom side of the turntable 2 is rotatably connected to one end of the bellows 3. The bellows 3 is located at the outer end of the first connecting rod 401. The other end of the bellows 3 is fixed to the steel casing 1. The connecting assembly 4 is movably installed on the steel casing 1. Both ends of the support bar 504 are fixed to the steel casing 1. The triangular block 5011 and the support bar 504 are movably connected to the middle of the second connecting rod 402. The connecting block 404 is movably connected in the limiting groove 5012. The outer circumferential surface of the steel casing 1 has a ring array of through holes for the first detection head 502 to pass through. The side of the first detection head 502 away from the limiting block 501 has a pointed conical structure. The first spring 503 is sleeved on the outer end of the first detection head 502. The first connecting rod 401 drives the second connecting rod 402 to move downward. The second connecting rod 402 drives the connecting block 404. The connecting block 404 slides downward along the limiting bar 5013. When the connecting block 404... When the device moves to the lowest end of the limiting bar 5013, the elastic force of the first spring 503 can pull the first detection head 502 through the through hole. The first detection head 502 pulls the limiting block 501 to move outward. The sensor installed inside the first detection head 502 detects the moving distance of the first detection head 502. The sensor transmits the data to the backend through a wireless signal. If the first detection head 502 contacts the rock mass, the moving distance of the first detection head 502 is short, and it is determined that the side of the steel casing 1 has entered the rock. Otherwise, it is determined that it has not entered the rock. The turntable 2 rotates in the opposite direction to drive the first connecting rod 401 to move upward. The second connecting rod 402 drives the connecting block 404 to move upward. The connecting block 404 can contact the inclined side of the limiting groove 5012, which can pull the limiting block 501 to reset and move. The limiting block 501 pulls the first detection head 502 to retract into the steel casing 1, which is convenient for the steel casing 1 to be hoisted and taken out.

[0043] like Figures 2 to 6As shown, the bottom of the steel casing 1 has a ring array of fixing holes for the second detection head 602 to pass through. The outer edge of the second detection head 602 is movably connected to the steel casing 1. The outer side of the locking block 605 is slidably connected to the second detection head 602. The end of the locking block 605 away from the third pull rope 604 is engaged with the steel casing 1. The fourth spring 606 is sleeved on the outer end of the third pull rope 604. The middle of the second detection head 602 has a limiting hole that matches the top rod 405. The top rod 405 is located directly above the movable block 601. When the turntable 2 is rotated, the turntable 2 can press the connecting assembly 4 downward, and the top rod 405 contacts the movable block 601 downward. When squeezed, the movable block 601 moves downward and pulls the third pull rope 604. The third pull rope 604 pulls the locking block 605, causing the fourth spring 606 to retract. The locking block 605 is no longer engaged with the steel casing 1. The elastic force of the second spring 603 pulls the second detection head 602 downward quickly. The second detection head 602 passes through the fixing hole. The sensor set inside the second detection head 602 detects the movement distance of the second detection head 602. The sensor transmits the data to the backend via wireless signal. If the second detection head 602 contacts the rock mass, the movement distance of the second detection head 602 is short, and it is determined that the bottom of the steel casing 1 has entered the rock. Otherwise, it is determined that it has not entered the rock.

[0044] The working principle provided by this invention

[0045] When the steel casing 1 is installed in the pit, if the steel casing 1 tilts, the gravity ball 407 will pull the first rope 406 to keep it vertical, while the second rope 408 will pull the tilted structure. The gravity ball 407 will also make the second rope 408 taut. The second rope 408 will then pull the tension sensor installed inside the movable block 601. The tension sensor will transmit data to the backend via a wireless signal. If the steel casing 1 is vertical, the second rope 408 will be slack and will not pull the tension sensor.

[0046] By rotating the turntable 2, the turntable 2 can squeeze the connecting component 4 to move downward. The top rod 405 contacts and squeezes the movable block 601 downward. The movable block 601 moves downward and pulls the third pull rope 604. The third pull rope 604 pulls the locking block 605, causing the fourth spring 606 to retract. The locking block 605 is not locked with the steel casing 1. The elastic force of the second spring 603 pulls the second detection head 602 to move downward quickly. The second detection head 602 passes through the fixing hole. The sensor set inside the second detection head 602 detects the movement distance of the second detection head 602. The sensor transmits the data to the backend through a wireless signal. If the second detection head 602 contacts the rock mass, the movement distance of the second detection head 602 is short, and it is judged that the bottom of the steel casing 1 has entered the rock. Otherwise, it is judged that it has not entered the rock.

[0047] The first connecting rod 401 drives the second connecting rod 402 to move downwards. The second connecting rod 402 drives the connecting block 404, which slides downwards along the limiting strip 5013. When the connecting block 404 moves to the lowest end of the limiting strip 5013, the elastic force of the first spring 503 can pull the first detection head 502 through the through hole. The first detection head 502 pulls the limiting block 501 to move outwards. The sensor installed inside the first detection head 502 detects the moving distance of the first detection head 502. The sensor transmits the data to the backend through a wireless signal. If the first detection head 502 contacts the rock mass, the moving distance of the first detection head 502 is short, and it is determined that the side of the steel casing 1 has entered the rock. Otherwise, it is determined that it has not entered the rock.

[0048] The turntable 2 rotates in the opposite direction, causing the first connecting rod 401 to move upward. The second connecting rod 402 causes the connecting block 404 to move upward. The connecting block 404 can contact the inclined side of the limiting groove 5012, which can pull the limiting block 501 to reset and move. The limiting block 501 pulls the first detection head 502 to retract into the steel casing 1, which is convenient for the steel casing 1 to be hoisted and removed, thus completing the operation.

[0049] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the penetration of a steel casing into rock, characterized in that, Including steel casing, and also: A turntable, which is threadedly connected to the top of a steel casing; A connecting component, wherein the top of four connecting components are arranged in a circular array on the bottom side of the turntable; The first detection component is installed in the middle of the connecting component for judging rock ingress on the side of the steel casing. The second detection component is located at the bottom of the connecting component and is used to determine rock ingress at the bottom of the steel casing. The connecting assembly includes a first connecting rod, the bottom end of the first connecting rod is fixedly connected to a third connecting rod via a second connecting rod, a connecting block is provided in the middle of the second connecting rod, and a top rod is fixedly connected to the bottom of the third connecting rod; The first detection component includes a limiting block and a first spring. A first detection head is fixedly connected to one side of the limiting block, and the two ends of the first spring are elastically connected to the steel casing and the first detection head, respectively. The other side of the limiting block is slidably connected to the support bar. The limiting block also includes a triangular block, which is a right-angled triangle structure. A limiting groove is formed on one side of the triangular block, and a limiting strip is fixedly connected to the side of the limiting groove closest to the first detection head. The second detection component includes a movable block, a second spring, and a fourth spring. The movable block is sleeved in the middle of the second detection head. The two ends of the second spring are elastically connected to the second detection head and the steel casing, respectively. The top side of the movable block is fixedly connected to one end of a third pull rope in a ring array. The other end of the third pull rope is fixedly connected to a locking block. The two ends of the fourth spring are elastically connected to the locking block and the second detection head, respectively. Both the first and second detection heads are equipped with sensors for detecting the moving distance. The connecting assembly also includes a first pull rope fixed to the bottom end of the top rod. A gravity ball is provided at the end of the first pull rope away from the top rod. The side of the gravity ball away from the top rod is fixed to one end of a second pull rope. The other end of the second pull rope is fixed to a movable block. A tension sensor is provided on the movable block. The steel casing can be either tilted or vertical.

2. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, The bottom side of the turntable is rotatably connected to one end of the corrugated pipe, which is located at the outer end of the first connecting rod. The other end of the corrugated pipe is fixed to the steel casing. The connecting assembly is movably installed on the steel casing. Both ends of the support bar are fixed to the steel casing. The triangular block and the support bar are movably connected to the middle of the second connecting rod. The connecting block is movably connected in the limiting groove.

3. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, The outer circumferential surface of the steel casing is provided with an annular array of through holes for the first detection head to pass through. The side of the first detection head away from the limiting block has a pointed conical structure, and the first spring is sleeved on the outer end of the first detection head.

4. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, The bottom of the steel casing has a ring array of fixing holes for the second detection head to pass through, and the outer edge of the second detection head is movably connected to the steel casing.

5. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, The outer side of the locking block is slidably connected to the second detection head, and the end of the locking block away from the third pull rope is engaged with the steel protective cylinder. The fourth spring is sleeved on the outer end of the third pull rope.

6. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, When the steel casing is tilted, the third connecting rod tilts, and the gravity ball pulls the first rope to remain vertical through gravity. The gravity ball can also pull the tension sensor on the movable block through the second rope.

7. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, When the steel casing is vertical, the third connecting rod is also vertical, and the gravity of the gravity ball will not pull the second rope.

8. The method for determining rock penetration of a steel casing according to claim 1, characterized in that, The second detection head has a limiting hole in the middle that matches the push rod, and the push rod is located directly above the movable block.

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