Device for installing and positioning inner pile casing of karst cave pile foundation

Abstract

The utility model relates to a karst cave pile foundation inner pile casing installing and positioning device which comprises a main body lifting rope, a plurality of auxiliary lifting ropes and a plurality of auxiliary lifting ropes. Wherein connecting pieces are arranged on the part located at the top end and between every two adjacent parts, and the part located at the bottom end is used for being connected with an inner pile casing. The at least two guide plates and the connecting piece are connected to the main body lifting rope; the arrangement direction of the guide plate is perpendicular to the axial direction of the main body lifting rope, and the bottom of the guide plate is used for making contact with the top end of an outer protection cylinder. In conventional large-scale multi-layer karst cave pile foundation construction, the cost performance is low due to the fact that full pile casing follow-up is adopted, an inner pile casing is placed at the deep position of a karst cave, a common construction mechanical device cannot meet the construction requirement, and the inner pile casing can be more accurately, stably and safely installed to the designed elevation of a karst cave pile foundation by using the lifting rope segmental utilization theory and combining with a guide plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge building pile foundation construction, and specifically relates to an inner casing installation and positioning device. Background Art

[0002] The difficulty of large-diameter pile foundation construction in complex and changeable karst areas is self-evident. Pile foundation construction has the primary technical risk when treating caves. The distribution space and depth of many caves are random, the rock surface is buried at different depths, and the strength is uneven. Especially for the pile foundation construction of large-scale multi-layer caves, compared with traditional pile foundation construction, more attention should be paid to the bearing capacity of the pile foundation to ensure the overall bearing capacity of the highway or bridge, and avoid settlement and other problems in the later stage. If the cave treatment method is not appropriate, it will often cause accidents such as drill drop, hammer jam, buried hammer, slurry leakage, hole collapse, broken piles, and even seriously affect the structural safety of the bridge.

[0003] In the prior art, if the inner casing is lowered into a deep cave, general mechanical devices cannot meet the construction requirements and the construction is very difficult. Some conventional multi-layer cave pile foundation construction usually adopts a full casing follow-up method, which uses excessive materials and has a high safety factor. Summary of the invention

[0004] The embodiment of the present application provides a device for installing and positioning inner casing of a karst cave pile foundation to solve the problem that in the construction of conventional large-scale multi-layer karst cave pile foundations, the cost-effectiveness of following up with full casing is low, the inner casing is lowered in a deeper part of the karst cave, and general construction machinery and equipment cannot meet the construction requirements.

[0005] In the first aspect, a device for installing and positioning an inner casing of a karst pile foundation is provided, which comprises: a main lifting rope, which comprises a plurality of parts from top to bottom; a part located at the top and a connecting piece are provided between two adjacent parts, and a part located at the bottom is used to connect the inner casing; at least two guide plates, the guide plates and the connecting piece are connected to the main lifting rope; the arrangement direction of the guide plates is perpendicular to the axial direction of the main lifting rope, and the bottom thereof is used to contact the top of the outer casing.

[0006] In some embodiments, the connecting member includes a rope loop, and the rope loop is provided with an area to be cut.

[0007] In some embodiments, temporary lifting ropes are further included, and the number of the temporary lifting ropes is equal to the number of the guide plates; the connecting pieces are also provided at both ends of the temporary lifting ropes, and are connected to the guide plates through the connecting pieces.

[0008] In some embodiments, the guide plate is provided with a plurality of through holes, each of which is provided with a detachable buckle; the guide plate is detachably connected to the connecting piece of the main sling rope and the temporary sling rope via the detachable buckle.

[0009] In some embodiments, the guide plate is a rectangular plate with four perforations; in the extension direction of the main lifting rope, the spacing between the two perforations located at the lower part is equal to the diameter of the inner casing, and the spacing between the two perforations located at the upper part is smaller than the spacing between the two perforations located at the lower part; the two perforations located at the upper part are connected to the connecting piece of the temporary lifting rope through a detachable buckle; the two perforations located at the lower part are connected to the connecting piece of the main lifting rope through a detachable buckle.

[0010] In some embodiments, the two through holes located at the lower part are respectively connected to the two ends of the guide plate in the length direction; the main lifting rope includes two steel wire ropes, and the two steel wire ropes are correspondingly connected to the detachable buckles in the through holes at the two ends of the guide plate in the length direction.

[0011] In some embodiments, the guide plate is a cross-shaped plate, the cross-shaped plate includes four arms, each arm includes two upper and lower spaced-apart perforations; the main lifting rope includes four steel wire ropes, the four steel wire ropes correspond to the four arms one by one, and are connected to the perforations located at the lower part of the arms; the temporary lifting rope is a claw-shaped lifting rope, the claw-shaped lifting rope includes four lifting ropes that converge at one point, and the end of each lifting rope away from the intersection is connected to the perforation located at the upper part of the arm.

[0012] In some embodiments, a plurality of circular holes are provided at the top of the inner protective tube, and the circular holes are also provided with the detachable buckle; the portion of the main body suspension rope located at the bottom is also provided with a connecting piece, which is detachably connected to the detachable buckle on the inner protective tube.

[0013] In some embodiments, the length of the guide plate is greater than or equal to the diameter of the outer casing.

[0014] In some embodiments, a penetration rod is further included for radially penetrating the inner casing, and the length of the penetration rod is greater than the diameter of the outer casing.

[0015] The beneficial effects brought by the technical solution provided by the utility model include:

[0016] Since the main lifting rope is connected with multiple guide plates from top to bottom through the connecting piece, when lifting the inner casing of a single segment, the crane is first connected to the first guide plate from bottom to top, and then the inner casing is lifted and lowered to the first depth so that the first guide plate is pressed on the top of the outer casing; then the crane is connected to the second guide plate, and the inner casing at the first depth is lifted, and then the first guide plate is removed, and then the inner casing is continued to be lowered to the designed elevation; after completing the installation of the inner casing of a single segment, the above steps are repeated to achieve the purpose of lifting the inner casing in sections.

[0017] By using the above device, the swing arm formed by each lifting of the main lifting rope is much smaller than the swing arm formed by directly using the entire length of the main lifting rope, thereby reducing the influence of the pendulum and facilitating the installation of the inner casing; when the guide plate is pressed on the top of the outer casing, the inner casing is adjusted and positioned by moving the guide plate, thereby facilitating precise positioning.

[0018] Finally, in a construction environment where the inner casing is lowered in a deeper part of the cave, the construction difficulty and cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of the inner casing installation and positioning device provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the main suspension rope structure provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a temporary suspension rope structure provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the guide plate structure provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of a cross-shaped guide plate provided in an embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of the claw-shaped lifting rope structure provided in an embodiment of the present application.

[0026] In the figure: 1. main lifting rope; 2. temporary lifting rope; 3. guide plate; 4. perforation; 5. inner casing; 6. outer casing; 7. lifting rope sleeve; 8. connecting piece; 9. ground; 10. buckle; 11. cross-shaped plate; 12. claw-shaped lifting rope. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The embodiment of the present application provides a device for installing and positioning inner casing of a karst cave pile foundation, which can solve the problems of low cost-effectiveness of following up with full casing in conventional large-scale multi-layer karst cave pile foundation construction, lowering inner casing in deep cave locations, and general construction machinery and equipment failing to meet construction requirements.

[0029] Since the full casing follow-up method is not convenient for construction, the inner casing is installed in sections. The inner casing section construction has the problem of inaccurate installation and positioning, which is specifically manifested as follows:

[0030] The lifting rope is long, and the distances between the connection points between the lifting rope and the crane, as well as between the connection points between the lifting rope and the inner casing are long, which may lead to pendulum-like problems and make installation inconvenient. In the process of positioning and moving the inner casing, the positioning is also affected to a certain extent due to the existence of pendulum-like problems.

[0031] See also Figure 1-4 , a device for installing and positioning an inner casing of a karst pile foundation, comprising: a main suspension rope 1, which includes multiple parts from top to bottom; a part located at the top and a connecting piece 8 are provided between two adjacent parts, and a part located at the bottom is used to connect an inner casing 5; at least two guide plates 3, the guide plates 3 are connected to the connecting piece 8 on the main suspension rope 1; the arrangement direction of the guide plates 3 is perpendicular to the axial direction of the main suspension rope 1, and the bottom thereof is used to contact the top of an outer casing 6.

[0032] Through the structural setting, on the one hand, according to different application scenarios, the total length of the main lifting rope 1 and the number and position of the rope loops on its surface can be flexibly adjusted, so as to reasonably set up a multi-section lifting device. For example, if the lifting device is constructed in two sections: the entire construction process includes two sections of lifting and lowering, the main lifting rope 1 should include three connecting pieces 8 at the top, bottom and connection, and the distance from the connection to the top is the distance from the first depth to the ground 9; if the lifting device is constructed in three sections: the entire construction process includes three sections of lifting and lowering, the main lifting rope 1 should include four rope loops at the top, bottom and two connections, and the distance from the first connection to the top is the distance from the first depth to the ground 9, and the distance from the second connection to the top is the distance from the second depth to the ground 9. By analogy, in a multi-section lifting device, the main lifting rope 1 has different designs.

[0033] It should be noted that in the arrangement of a multi-stage lifting device, only two guide plates 3 are needed. After the lifting device is installed, the removed guide plates 3 can continue to be used in the subsequent assembly of the lifting device. The inner casing 5 is lowered to the designed elevation in sections. The whole process is flexible and convenient, which enhances the construction dominance.

[0034] On the other hand, the guide plate 3 is connected to the inner casing 5 with the main lifting rope 1 to ensure that when the inner casing 5 is lowered, the crawler crane can directly hook the guide plate 3 above the ground 9, shortening the length of the lifting rope, making the grip more stable, greatly reducing the pendulum, and making the entire lowering process more accurate, stable and safe.

[0035] Specifically, since the main hoisting rope 1 is connected with a plurality of guide plates 3 from top to bottom through a connector, when hoisting the inner casing 5 of a single segment, the crane is first connected to the first guide plate 3 from bottom to top, and then the inner casing 5 is lifted and lowered to the first depth so that the first guide plate 3 is pressed on the top of the outer casing 6; then the crane is connected to the second guide plate 3, and the inner casing 5 at the first depth is lifted, and then the first guide plate 3 is removed, and then the inner casing 5 is continued to be lowered to the design elevation; after the installation of the inner casing 5 of a single segment is completed, the above steps are repeated to achieve the purpose of lifting the inner casing 5 in sections. Through the use of the above device, the swing arm formed by each hoisting of the main hoisting rope 1 is much smaller than the swing arm formed by directly using the entire length of the main hoisting rope 1, thereby reducing the influence of the pendulum, thereby facilitating the installation of the inner casing 5; when the guide plate 3 is pressed on the top of the outer casing 6, the inner casing 5 is adjusted and positioned by moving the guide plate 3, thereby facilitating accurate positioning. Finally, in a construction environment where the inner casing is lowered in a deeper part of the cave, the construction difficulty and cost are reduced.

[0036] In some preferred embodiments, the connecting member 8 includes a rope loop, and a to-be-cut area is provided on the rope loop, so that the rope loop connected to the guide plate 3 can be easily cut off when the guide plate 3 is extracted. Each rope loop of the main body hanging rope 1 is connected to the inner casing 5 and the guide plate 3 respectively, so that the force during the lowering process of the inner casing 5 is more stable, and the lowering is more accurate and safe.

[0037] In some preferred embodiments, temporary lifting ropes 2 are also included, and the number of temporary lifting ropes 2 is equal to the number of guide plates 3; both ends of the temporary lifting ropes 2 are also provided with connecting pieces 8, and are connected to the guide plates 3 through the connecting pieces 8. The temporary lifting ropes 2 and the guide plates 3 are used in conjunction with each other, and the number is the same, and together they constitute a lifting rope sleeve 7, so that the lifting device as a whole can be hooked, and the inner casing 5 can be slowly lowered.

[0038] In some preferred embodiments, a plurality of perforations 4 are provided on the guide plate 3, and each perforation 4 is provided with a detachable buckle 10. The specific structure of the detachable buckle 10 can refer to Chinese patents with application numbers CN202023238808.3 and CN202020724721.8. The detachable buckle 10 has a similar structure to mountaineering rope locks in different fields of the two. The opening can be achieved by applying pressure to the detachable buckle 10, and the opening can be achieved when the pressure disappears. The guide plate 3 is detachably connected to the connecting piece 8 of the main lifting rope 1 and the temporary lifting rope 2 through the detachable buckle 10; through this arrangement, the rope loop of the main lifting rope 1 can be flexibly put in or taken out, so that the integrity of the main lifting rope 1 can be maintained and it can be repeatedly used.

[0039] In some preferred embodiments, the guide plate 3 is a rectangular plate with four perforations 4; in the extension direction of the main lifting rope 1, the spacing between the two perforations 4 at the bottom is equal to the diameter of the inner casing 5, and the spacing between the two perforations 4 at the top is smaller than the spacing between the two perforations 4 at the bottom; the two perforations 4 at the top are connected to the connector 8 of the temporary lifting rope 2 through a detachable buckle 10; the two perforations 4 at the bottom are connected to the connector 8 of the main lifting rope 1 through a detachable buckle 10. The main lifting rope 1 is connected to the two lower perforations 4 in correspondence, so that the two main lifting ropes are parallel after being stressed, ensuring that they are in the best stress state; the spacing between the two perforations 4 at the top of the guide plate 3 is smaller than the spacing between the two perforations 4 at the bottom, so as to distinguish the upper and lower perforations 4, and can reduce the length of the temporary lifting rope 2 and save materials.

[0040] In some preferred embodiments, the main lifting rope 1 includes two steel ropes, which are connected to the detachable buckles 10 in the through holes 4 at both ends of the guide plate 3 in the length direction, but are not limited to steel ropes, as long as the material is stable and not easily stretched or broken; the two through holes 4 located at the lower part are respectively arranged at the two ends of the guide plate 3 in the length direction; the rope loops of the two steel ropes are respectively connected to the detachable buckles 10 at both ends of the guide plate 3 in the length direction, so that the guide plate 3 can stably tighten the inner casing 5.

[0041] In some preferred embodiments, reference Figure 1-4 As shown, a steel wire rope with a diameter of 21.5 mm is used, of which the main steel wire rope is 54 m long (made up of two sections of steel wire rope 30 m + 24 m), the temporary steel wire rope is 4 m long, and the inner casing 5 is lowered to the designed elevation in two stages of lifting:

[0042] Step 1: weld the inner casing 5 into a whole by sections, penetrate the inner casing 5 radially with a penetration rod and fix it on the ground 9, ensuring that the penetration rod is horizontal and vertical to the inner casing 5;

[0043] Step 2: Connect the loops of one end of the two main steel wire ropes to the circular holes on both sides of any diameter of the inner casing 5, and connect the two through holes 4 on the upper part of the guide plate 3 to the temporary steel wire rope to form the first lifting rope sleeve 7, and the two through holes 4 on the lower part of the guide plate 3 are connected to the loops of the main steel wire ropes correspondingly, together forming the first lifting unit;

[0044] Step 3: Use a crawler crane to hook the first lifting rope sleeve 7. After the force is evenly and stably applied, remove the through-rod and slowly lower it to the first design elevation. Fix the guide plate 3 on the ground 9 to stabilize the inner casing 5.

[0045] Step 4: connect the two through holes 4 on the upper part of a guide plate 3 to the rope loop of a temporary steel wire rope to form a second lifting rope sleeve 7, and connect the two through holes 4 on the lower part of the guide plate 3 to the rope loop of the main steel wire rope to form a second lifting unit;

[0046] Step 5: Use a crawler crane to hook the second lifting rope sleeve 7. After the force is evenly and stably applied, use a tool to disconnect the area to be cut on the rope loop connecting the main wire rope and the guide plate 3 located on the ground 9, remove the guide plate 3, and continue to slowly lower the inner casing 5 to the final designed elevation.

[0047] Of course, during the lowering construction of the casing 5 in the specific cave pile foundation, the lifting process can be completed in multiple stages. It is only necessary to adjust the length of each part of the lifting rope 1 that constitutes the main lifting rope according to the construction situation, and the length of each part of the lifting rope corresponds to the lowering height each time; referring to the specific embodiment of this time, the main lifting rope 1 is composed of two sections of 20m+34m lifting rope, and the connection is compiled into a rope loop as a connecting piece 8, that is, the two lowering heights are 20m and 34m, and finally it is lowered to the designed elevation of the cave pile foundation.

[0048] In some preferred embodiments, in order to further improve the stability of the installation of the inner casing 5, the guide plate 3 and the temporary lifting rope 2 are improved, and the number of the main lifting ropes 1 is increased to 4: Figure 2 and Figure 5-6The guide plate 3 is a cross-shaped plate 11, which includes four arms, each of which includes two upper and lower spaced through holes 4; the main lifting rope 1 includes four steel wire ropes, which correspond to the four arms one by one and are connected to the through holes 4 located at the bottom of the arms; the temporary lifting rope 2 is a claw-shaped lifting rope 12, which includes four lifting ropes that intersect at one point, and the end of each lifting rope away from the intersection is connected to the through hole (4) located at the top of the arm; in this embodiment, In the embodiment, the guide plate 3 is improved to a cross-shaped plate 11, and its four arms are correspondingly connected with the four main lifting ropes 1, so that the force during the lowering of the inner casing is more firm, more stable and safer; further, in order to better fit with the temporary lifting rope 2, the original temporary lifting rope 2 is improved to a claw-shaped lifting rope 12, and the four ends of the claw-shaped lifting rope 12 are provided with rope loops, and are respectively connected to the upper detachable buckles 10 of the four arms of the cross-shaped plate 11, so that the grip is more firm and the installation of the inner casing 5 is safer and more accurate.

[0049] In some preferred embodiments, the top of the inner casing 5 is provided with a plurality of circular holes, which are also provided with detachable buckles 10, and the bottom portion of the main lifting rope 1 is also provided with a connector 8, which is detachably connected to the detachable buckle 10 on the inner casing 5. This allows the inner casing to be stably stressed by the lifting device and gradually and slowly lowered to the designed elevation.

[0050] In some preferred embodiments, the length of the guide plate 3 should be greater than or equal to the diameter of the outer casing 6 to ensure that the guide plate 3 can be firmly connected to the inner casing 5 suspended therefrom when it is placed and fixed on the ground 9 .

[0051] In some preferred embodiments, a rod for radially penetrating the inner casing 5 is further included, and the length of the rod is greater than the diameter of the outer casing 6. The rod is mainly used to fix the upper end of the inner casing 5 horizontally to the ground 9 before the lifting device is assembled, so as to prepare for the subsequent installation of the lifting device and the lowering of the inner casing 5. Therefore, the length of the rod should be greater than the diameter of the outer casing 6 to ensure that the rod can firmly fix the inner casing 5 to the ground 9.

[0052] In some preferred embodiments, the guide plate 3 is made of a steel plate, but is not limited to a steel plate, as long as it is stable in force and not easily deformed.

[0053] In some preferred embodiments, the cross-section of the through hole 4 is a circle with a diameter of 50 mm, but is not limited to a circle, and can be a polygon, a circle, or an ellipse, as long as the detachable buckle 10 can pass through it smoothly.

[0054] In some preferred embodiments, the detachable ring buckle 10 is an iron ring, but is not limited to an iron ring. It can ensure that the rope loop of a specific thickness selected for construction can be smoothly inserted after pressing the detachable ring buckle 10, and is not easily broken by force.

[0055] Beneficial effects of this application:

[0056] 1. Since the main hoisting rope 1 is connected with a plurality of guide plates 3 from top to bottom through a connector, when hoisting the inner casing 5 of a single segment, first connect the crane to the first guide plate 3 from bottom to top, then lift the inner casing 5 and lower it to the first depth so that the first guide plate 3 is pressed on the top of the outer casing 6; then connect the crane to the second guide plate 3, lift the inner casing 5 at the first depth, remove the first guide plate 3, and then continue to lower the inner casing 5 to the design elevation; after completing the installation of the inner casing 5 of a single segment, repeat the above steps to achieve the purpose of hoisting the inner casing 5 in sections. Through the use of the above device, the swing arm formed by each hoisting of the main hoisting rope 1 is much smaller than the swing arm formed by directly using the entire length of the main hoisting rope 1, thereby reducing the influence of the pendulum, thereby facilitating the installation of the inner casing 5; when the guide plate 3 is pressed on the top of the outer casing 6, the inner casing 5 is adjusted and positioned by moving the guide plate 3, thereby facilitating accurate positioning. Finally, in a construction environment where the inner casing is lowered in a deeper part of the cave, the construction difficulty and cost are reduced.

[0057] 2. According to different application scenarios, the total length of the main lifting rope 1 and the number and position of the rope loops on its surface can be flexibly adjusted, and then the multi-section lifting device can be reasonably set to lower the inner casing 5 to the designed elevation in sections. The whole process is flexible and convenient, and the construction dominance is enhanced;

[0058] 3. Use the main lifting rope 1 to connect the guide plate 3 with the inner casing 5 to ensure that when the inner casing 5 is lowered, the crawler crane can directly hook the guide plate 3 above the ground, shorten the length of the lifting rope, make the grip more stable, greatly reduce the pendulum, and make the entire lowering process more accurate, stable and safe;

[0059] 4. The lifting device is composed of a main lifting rope 1, a temporary lifting rope 2 and a guide plate 3, which are assembled and constructed in steps, thus solving the problem of difficulty in transporting the whole to the construction site and high cost after the original integrated processing in the factory.

[0060] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0061] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0062] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A device for installing and positioning a casing in a karst cave pile foundation, characterized in that: It includes: A main body sling (1), which comprises a plurality of parts from top to bottom; The part at the top and between two adjacent parts are provided with a connecting piece (8), and the part at the bottom is used to connect to the inner casing (5); At least two guide plates (3), the guide plates (3) and the connecting piece (8) are connected to the main body suspension rope (1); the arrangement direction of the guide plates (3) is perpendicular to the axial direction of the main body suspension rope (1), and the bottom of the guide plates (3) is used to contact the top end of the outer casing (6).

2. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 1, characterized in that: The connecting member (8) comprises a rope loop, and an area to be cut is provided on the rope loop.

3. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 1, characterized in that: It also comprises temporary lifting ropes (2), the number of which is equal to the number of the guide plates (3); both ends of the temporary lifting ropes (2) are also provided with the connecting pieces (8), and are connected to the guide plates (3) via the connecting pieces (8).

4. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 3, characterized in that: The guide plate (3) is provided with a plurality of through holes (4), each of the through holes (4) being provided with a detachable buckle (10); the guide plate (3) is detachably connected to the connecting piece (8) of the main lifting rope (1) and the temporary lifting rope (2) via the detachable buckle (10).

5. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 4, characterized in that: The guide plate (3) is a rectangular plate, and has four perforations (4) on the rectangular plate; In the extension direction of the main suspension rope (1), the spacing between the two through holes (4) located at the lower part is equal to the diameter of the inner casing (5), and the spacing between the two through holes (4) located at the upper part is smaller than the spacing between the two through holes (4) located at the lower part; The two through holes (4) located at the upper part are connected to the connecting piece (8) of the temporary lifting rope (2) through a detachable buckle (10); and the two through holes (4) located at the lower part are connected to the connecting piece (8) of the main lifting rope (1) through a detachable buckle (10).

6. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 5, characterized in that: The two through holes (4) located at the bottom are respectively connected to the two ends of the guide plate (3) in the length direction; The main body suspension rope (1) comprises two steel wire ropes, and the two steel wire ropes are correspondingly connected to detachable buckles (10) in the through holes (4) at both ends of the guide plate (3) in the length direction.

7. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 4, characterized in that: The guide plate (3) is a cross-shaped plate (11), the cross-shaped plate (11) comprises four arms, and each arm comprises two upper and lower through holes (4) arranged at intervals; The main body suspension rope (1) comprises four steel wire ropes, which correspond to the four support arms one by one and are connected to the through holes (4) located at the lower part of the support arms; The temporary lifting rope (2) is a claw-shaped lifting rope (12), which comprises four lifting ropes that meet at one point, and one end of each lifting rope away from the meeting point is connected to a through hole (4) located at the upper part of the support arm.

8. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 4, characterized in that: The top end of the inner casing (5) is provided with a plurality of circular holes, and the circular holes are also provided with the detachable ring buckles (10); The portion of the main body suspension rope (1) located at the bottom is also provided with a connecting piece (8), and the connecting piece (8) is detachably connected to a detachable ring buckle (10) on the inner casing (5).

9. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 1, characterized in that: The length of the guide plate (3) is greater than or equal to the diameter of the outer casing (6).

10. The device for installing and positioning the inner casing of a karst cave pile foundation according to claim 1, characterized in that: It also comprises a penetration rod for radially penetrating the inner casing (5), wherein the length of the penetration rod is greater than the diameter of the outer casing (6).

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