Auxiliary positioning device for steel casing welding in karst cave pile foundation construction

Abstract

The utility model discloses an auxiliary positioning device for welding a steel casing in karst cave pile foundation construction, belongs to the technical field of positioning devices, and aims to solve the problems that in pile foundation construction in a karst cave geological area, a device for positioning an upper casing section is lacked during welding of the steel casing; the device comprises a bottom plate, a bottom limiting sleeve, a top limiting sleeve and a lifting driving unit, a penetrating through hole matched with the steel casing is machined in the center of the top of the bottom plate, the bottom limiting sleeve is coaxially installed at the top of the bottom plate, and the top limiting sleeve is coaxially installed at the top of the bottom plate. The top limiting sleeve is coaxially arranged at the top end of the bottom limiting sleeve, the lifting driving unit is installed at the top of the bottom plate, the movable end of the lifting driving unit is detachably connected with the top limiting sleeve, and the lifting driving unit can drive the top limiting sleeve to reciprocate in the vertical direction above the bottom limiting sleeve. The auxiliary positioning device is mainly used for steel casing welding in karst cave pile foundation construction.

Description

Technical Field

[0001] This utility model belongs to the field of positioning device technology, specifically relating to an auxiliary positioning device for welding steel casings in the construction of karst cave pile foundations. Background Technology

[0002] When constructing pile foundations in karst cave geological areas, the steel casing follow-up method is required to assist in drilling. Research indicates that this method involves welding multiple small casing segments progressively at different drilling depths. Ensuring the stability between the segments during welding is crucial. While the lower segment is secured by the geological structure, the upper segment, typically suspended and positioned by a crane, is prone to radial forces perpendicular to its axis during circumferential welding. This can cause misalignment between the upper and lower casings, affecting the overall coaxiality of the steel casing and consequently impacting the accuracy and smoothness of subsequent drilling operations. Therefore, developing an auxiliary positioning device for steel casing welding in karst cave pile foundation construction to ensure the stability and accuracy between casing segments during welding is essential. Utility Model Content

[0003] This utility model aims to solve the problem that in pile foundation construction in karst cave geological areas, there is a lack of a device for positioning the upper cylinder section during steel casing welding, which easily leads to misalignment between the axes of the upper and lower cylinders after welding, affecting the overall coaxiality of the steel casing. Therefore, it provides an auxiliary positioning device for steel casing welding in karst cave pile foundation construction.

[0004] An auxiliary positioning device for welding steel casings in the construction of karst cave pile foundations is disclosed. The auxiliary positioning device includes a base plate, a bottom limiting sleeve, a top limiting sleeve, and a lifting drive unit. A through hole that mates with the steel casing is machined at the top center of the base plate. The bottom limiting sleeve is coaxially installed on the top of the base plate, and its bottom end is connected to the through hole. The top limiting sleeve is coaxially installed on the top of the bottom limiting sleeve. The lifting drive unit is installed on the top of the base plate, and its movable end is detachably connected to the top limiting sleeve. The lifting drive unit can drive the top limiting sleeve to reciprocate vertically above the bottom limiting sleeve.

[0005] Furthermore, a connecting flange sleeve is fitted on the outer side of the bottom end of the bottom limiting sleeve, and the connecting flange sleeve and the bottom limiting sleeve are integrally formed. The bottom limiting sleeve is detachably connected to the base plate through the connecting flange sleeve.

[0006] Furthermore, the lifting drive unit includes N lifting drive components, where N is a positive integer. The N lifting drive components are arranged equidistantly around the top limiting sleeve in the circumferential direction. The fixed part of each lifting drive component is located on the top of the base plate and is detachably connected to the base plate. The movable part of each lifting drive component is located on the outer circular surface of the top limiting sleeve and is detachably connected to the top limiting sleeve.

[0007] Furthermore, the value of N ranges from 3 to 6;

[0008] Furthermore, the lifting drive assembly includes a longitudinal hydraulic push rod, a horizontal connecting rod, and a connecting arc plate. The longitudinal hydraulic push rod is erected vertically at the top edge of the base plate, and the cylinder of the longitudinal hydraulic push rod is detachably connected to the base plate. The horizontal connecting rod is located on the piston rod end of the longitudinal hydraulic push rod, and one end of the horizontal connecting rod is detachably connected to the piston rod end of the hydraulic push rod by bolts. The connecting arc plate is located on the other end of the horizontal connecting rod, and the outer side of the connecting arc plate is fixedly connected to the horizontal connecting rod. The inner side of the connecting arc plate is in close contact with the top limiting sleeve and is detachably connected to the top limiting sleeve by bolts.

[0009] Furthermore, the lifting drive assembly also includes a pneumatic diagonal brace mechanism, which is located between the longitudinal hydraulic push rod and the horizontal connecting rod. One end of the pneumatic diagonal brace mechanism is detachably connected to the cylinder on the side of the longitudinal hydraulic push rod facing the bottom limit sleeve, and the other end of the pneumatic diagonal brace mechanism is detachably connected to the bottom of the horizontal connecting rod.

[0010] Furthermore, the pneumatic diagonal bracing mechanism includes a first hinge seat, a pneumatic strut, and a second hinge seat. The first hinge seat is located at the bottom of the horizontal connecting rod and is detachably connected to the horizontal connecting rod by bolts. The second hinge seat is located on the side of the longitudinal hydraulic push rod facing the bottom limiting sleeve and is detachably connected to the cylinder of the longitudinal hydraulic push rod by bolts. The pneumatic strut is diagonally positioned between the first hinge seat and the second hinge seat, and the extension end of the pneumatic strut is hinged to the first hinge seat, while the housing end of the pneumatic strut is hinged to the second hinge seat.

[0011] Furthermore, the top of the base plate is provided with two lifting lugs at equal intervals along the circumference, and each lifting lug is detachably connected to the base plate by threads;

[0012] Furthermore, rubber gaskets are attached to both the top of the bottom limiting sleeve and the bottom of the top limiting sleeve.

[0013] The beneficial effects of this application compared to the prior art are:

[0014] This application provides an auxiliary positioning device for welding steel casings in karst cave pile foundation construction. It includes two sleeve structures for circumferentially limiting the steel casing. When welding is required, the upper limiting sleeve structure is lifted by a lifting unit to the outside of the upper steel casing and circumferentially constrains it. The lower limiting sleeve structure wraps around the outside of the lower steel casing and, in conjunction with the geological structure, circumferentially constrains it. A welding working area is left between the upper and lower limiting sleeves to facilitate welding and fixing of the two casings at the joint. This double-limiting sleeve structure effectively ensures the accuracy of the joint between the upper and lower casings, while also avoiding the influence of radial forces generated during welding on the welding area. This ensures the overall coaxiality of the welded steel casing and effectively improves the accuracy and smoothness of subsequent drilling procedures. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the auxiliary positioning device described in this application;

[0016] Figure 2 This is a schematic diagram of the auxiliary positioning device described in this application (after adding a pneumatic diagonal brace mechanism).

[0017] Figure 3 This is a top view of the auxiliary positioning device described in this application;

[0018] Figure 4 This is a schematic diagram of the auxiliary positioning device described in this application (when the top limiting sleeve is in the raised state).

[0019] Figure 5 This is a schematic diagram of the operation of the auxiliary positioning device described in this application;

[0020] Figure 6 This is a schematic diagram of the pneumatic diagonal brace mechanism in the auxiliary positioning device described in this application;

[0021] The figure shows: 1. Base plate, 2. Connecting flange sleeve, 3. Bottom limiting sleeve, 4. Top limiting sleeve, 5. Longitudinal hydraulic push rod, 6. Horizontal connecting rod, 7. Connecting arc plate, 8. Lifting lug, 9. Pneumatic diagonal bracing mechanism, 91. No. 1 hinge seat, 92. Pneumatic strut, 93. No. 2 hinge seat, 10. Upper steel casing, 11. Lower steel casing, 12. Geological foundation, and 13. Weld. Detailed Implementation

[0022] Specific implementation method one: Combining Figures 1 to 6This embodiment describes an auxiliary positioning device for welding steel casings in the construction of karst cave pile foundations. The auxiliary positioning device includes a base plate 1, a bottom limiting sleeve 3, a top limiting sleeve 4, and a lifting drive unit. A through hole that cooperates with the steel casing is machined at the top center of the base plate 1. The bottom limiting sleeve 3 is coaxially installed on the top of the base plate 1, and the bottom end of the bottom limiting sleeve 3 is connected to the through hole. The top limiting sleeve 4 is coaxially installed on the top of the bottom limiting sleeve 3. The lifting drive unit is installed on the top of the base plate 1, and the movable end of the lifting drive unit is detachably connected to the top limiting sleeve 4. The lifting drive unit can drive the top limiting sleeve 4 to reciprocate vertically above the bottom limiting sleeve 3.

[0023] This embodiment provides an auxiliary positioning device for welding steel casings in karst cave pile foundation construction. The base plate 1 serves as a supporting structure, placed on the geological foundation, primarily supporting the bottom limiting sleeve 3 and the lifting drive unit. The bottom limiting sleeve 3 and the top limiting sleeve 4 act as circumferential constraint components for the steel casing. In actual operation, their inner walls can be coated with lubricating grease to reduce friction between the limiting sleeve and the steel casing, ensuring smooth lowering of the steel casing after welding. The lifting drive unit, as the component driving the top limiting sleeve 4 to move vertically, is mainly used to adjust the position of the top limiting sleeve 4 according to working conditions. During welding of the upper and lower casings, the lifting drive unit drives the top limiting sleeve 4 upwards and circumferentially constrains the upper steel casing. During lowering of the steel casing, the lifting drive unit drives the top limiting sleeve 4 downwards, forming a guide sleeve with the bottom limiting sleeve 3 to improve the accuracy of lowering the steel casing.

[0024] Specific Implementation Method Two: Combining Figures 1 to 6 This embodiment differs from Specific Embodiment 1 in that a connecting flange sleeve 2 is fitted onto the outer side of the bottom end of the bottom limiting sleeve 3, and the connecting flange sleeve 2 and the bottom limiting sleeve 3 are integrally formed. The bottom limiting sleeve 3 is detachably connected to the base plate 1 via the connecting flange sleeve 2. Other components and connection methods are the same as in Specific Embodiment 1.

[0025] In this embodiment, the connecting flange sleeve 2 is detachably connected to the base plate 1 by bolts, which improves the ease of installation. At the same time, multiple reinforcing ribs are also provided on the outer periphery of the connecting flange sleeve 2 to ensure the stability of the bottom limiting sleeve 3 and improve the support capacity of the bottom limiting sleeve 3.

[0026] Specific implementation method three: Combining Figures 1 to 6This embodiment differs from Specific Embodiment Two in that the lifting drive unit includes N lifting drive components, where N is a positive integer. The N lifting drive components are arranged equidistantly around the top limiting sleeve 4 in the circumferential direction. The fixed part of each lifting drive component is located on the top of the base plate 1 and is detachably connected to the base plate 1. The movable part of each lifting drive component is located on the outer circular surface of the top limiting sleeve 4 and is detachably connected to the top limiting sleeve 4. Other components and connection methods are the same as in Specific Embodiment Two.

[0027] Specific implementation method four: Combining Figures 1 to 6 This embodiment differs from Specific Embodiment Three in that the value of N ranges from 3 to 6. Other components and connections are the same as in Specific Embodiment Three.

[0028] Specific implementation method five: Combining Figures 1 to 6 This embodiment differs from specific embodiment four in that the lifting drive assembly includes a longitudinal hydraulic push rod 5, a horizontal connecting rod 6, and a connecting arc plate 7. The longitudinal hydraulic push rod 5 is vertically erected at the top edge of the base plate 1, and its cylinder is detachably connected to the base plate 1. The horizontal connecting rod 6 is located on the piston rod end of the longitudinal hydraulic push rod 5, and one end of the horizontal connecting rod 6 is detachably connected to the piston rod end of the hydraulic push rod 5 via bolts. The connecting arc plate 7 is located on the other end of the horizontal connecting rod 6, and its outer side is fixedly connected to the horizontal connecting rod 6. The inner side of the connecting arc plate 7 is tightly attached to the top limiting sleeve 4 and detachably connected to the top limiting sleeve 4 via bolts. Other components and connection methods are the same as in specific embodiment four.

[0029] As described in Specific Embodiments 3 to 5, the lifting drive unit provides vertical thrust through the longitudinal hydraulic push rod 5, and under the drive of the vertical thrust, the horizontal connecting rod 6 and the connecting arc plate 7 are displaced in the vertical direction. Since the connecting arc plate 7 is connected to the top limiting sleeve 4 by bolts, the top limiting sleeve 4 will also rise synchronously with the connecting arc plate 7 to separate from the bottom limiting sleeve 3. The function of the horizontal connecting rod 6 is to increase the distance between the longitudinal hydraulic push rod 5 and the bottom limiting sleeve 3, so as to reserve working space for the construction personnel to carry out welding work.

[0030] Specific implementation method six: Combining Figures 1 to 6 This embodiment differs from specific embodiment five in that the lifting drive assembly further includes a pneumatic diagonal brace mechanism 9. The pneumatic diagonal brace mechanism 9 is disposed between the longitudinal hydraulic push rod 5 and the horizontal connecting rod 6. One end of the pneumatic diagonal brace mechanism 9 is detachably connected to the cylinder of the longitudinal hydraulic push rod 5 facing the bottom limiting sleeve 3, and the other end of the pneumatic diagonal brace mechanism 9 is detachably connected to the bottom of the horizontal connecting rod 6. Other components and connection methods are the same as in specific embodiment five.

[0031] Specific implementation method seven: Combining Figures 1 to 6 This embodiment differs from specific embodiment six in that the pneumatic bracing mechanism 9 includes a first hinge seat 91, a pneumatic strut 92, and a second hinge seat 93. The first hinge seat 91 is located at the bottom of the horizontal connecting rod 6 and is detachably connected to the horizontal connecting rod 6 by bolts. The second hinge seat 93 is located on the side of the longitudinal hydraulic push rod 5 facing the bottom limiting sleeve 3 and is detachably connected to the cylinder of the longitudinal hydraulic push rod 5 by bolts. The pneumatic strut 92 is obliquely positioned between the first hinge seat 91 and the second hinge seat 93, with its extension end hinged to the first hinge seat 91 and its housing end hinged to the second hinge seat 93. Other components and connection methods are the same as in specific embodiment six.

[0032] As described in Specific Embodiments Six and Seven, the pneumatic bracing mechanism 9 is a component used to provide auxiliary support for the horizontal connecting rod 6, ensuring the stability of the horizontal connecting rod 6 during operation. Since the top limiting sleeve 4 has a certain weight, in order to prevent the horizontal connecting rod 6 from breaking due to tilting when it drives the top limiting sleeve 4 upward, thus causing a construction accident, a pneumatic support rod 92 is added below the horizontal connecting rod 6. The pneumatic support rod 92 provides auxiliary support force. The pneumatic support rod 92 is inclined, and its connection with the horizontal connecting rod 6 is closer to the middle of the horizontal connecting rod 6, which can effectively enhance the stability of the horizontal connecting rod 6 during operation. In addition, both ends of the pneumatic support rod 92 are equipped with hinge structures, which can well adapt to the height changes of the horizontal connecting rod 6 and avoid the problem of structural dead points.

[0033] Specific implementation method eight: Combining Figures 1 to 6 This embodiment differs from specific embodiment seven in that two lifting lugs 8 are equidistantly spaced along the circumference of the top of the base plate 1, and each lifting lug 8 is threadedly detachably connected to the base plate 1. Other components and connection methods are the same as in specific embodiment seven.

[0034] This design improves the ease of transporting the base plate 1 by adding lifting lugs 8. The bottom of the lifting lugs 8 is a threaded column structure, and the top of the base plate 1 is machined with threaded connection holes to match it. During installation, the lifting lugs 8 only need to be inserted into the base plate 1 and tightened by screwing them in.

[0035] Specific implementation method nine: Combining Figures 1 to 6 This embodiment differs from specific embodiment eight in that rubber gaskets are attached to the top of the bottom limiting sleeve 3 and the bottom of the top limiting sleeve 4. Other components and connection methods are the same as in specific embodiment eight.

[0036] This design is intended to buffer the top limiting sleeve 4 when it falls, preventing the bottom limiting sleeve 3 from rigidly contacting the top limiting sleeve 4 during frequent falls, which could cause deformation of its end face and affect its subsequent use in operation.

[0037] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0038] Working principle:

[0039] The auxiliary positioning device provided in this application for welding steel casings in the construction of karst cave pile foundations first assembles the various components according to the connection relationships described in specific embodiments one to nine before operation. During operation, the auxiliary positioning device has two working states:

[0040] State 1: When the bottom limiting sleeve 3 and the top limiting sleeve 4 are separated, this state is used during the welding process of the steel casing. First, the top limiting sleeve 4 is raised by the lifting drive assembly, causing the bottom limiting sleeve 3 to separate from the top limiting sleeve 4, until the center line of the top limiting sleeve 4 is higher than the top of the lower steel casing 11. At this time, the lifting drive assembly stops working. Then, the upper steel casing 10 is transported to the top of the lower steel casing 11 by the hoisting device, and the upper steel casing 10 is moved downward by the hoisting device until the upper steel casing 10 is inserted at the top. In the limiting sleeve 4, the lifting drive component drives the top limiting sleeve 4 to continue rising until the bottom of the top limiting sleeve 4 is higher than the top of the lower steel casing 11. After the top limiting sleeve 4 rises for the second time, the hoisting device drives the upper steel casing 10 to continue moving downward until the upper steel casing 10 contacts the lower steel casing 11. At this time, there is also a welding working space between the bottom limiting sleeve 3 and the top limiting sleeve 4. The workers can carry out welding work between the two casings under the circumferential constraint of the top limiting sleeve 4 on the upper steel casing 10.

[0041] State 2: When the bottom limiting sleeve 3 and the top limiting sleeve 4 are combined, this state is used during the lowering of the steel casing. After the two casings are welded and fixed together, the top limiting sleeve 4 is lowered by the lifting drive assembly, so that the bottom limiting sleeve 3 contacts the top limiting sleeve 4. After the bottom limiting sleeve 3 contacts the top limiting sleeve 4, the welded steel casing continues to descend by the hoisting device, completing the insertion of the steel casing structure into the geological foundation. When the top of the steel casing structure is 20-30cm away from the top of the top limiting sleeve 4, the insertion action stops. At this point, the steel casing has been inserted into place, and the hoisting device can be removed from the top of the steel casing.

Claims

1. An auxiliary positioning device for welding steel casings in the construction of karst cave pile foundations, characterized in that: The auxiliary positioning device includes a base plate (1), a bottom limiting sleeve (3), a top limiting sleeve (4), and a lifting drive unit. The top center of the base plate (1) is machined with a through hole that is matched with the steel casing. The bottom limiting sleeve (3) is coaxially installed on the top of the base plate (1), and the bottom end of the bottom limiting sleeve (3) is connected to the through hole. The top limiting sleeve (4) is coaxially installed on the top of the bottom limiting sleeve (3). The lifting drive unit is installed on the top of the base plate (1), and the movable end of the lifting drive unit is detachably connected to the top limiting sleeve (4). The lifting drive unit can drive the top limiting sleeve (4) to reciprocate vertically above the bottom limiting sleeve (3).

2. The auxiliary positioning device for welding steel casings in karst cave pile foundation construction according to claim 1, characterized in that: The bottom limiting sleeve (3) is fitted with a connecting flange sleeve (2) on the outer side of the bottom end, and the connecting flange sleeve (2) and the bottom limiting sleeve (3) are integrally formed. The bottom limiting sleeve (3) is detachably connected to the base plate (1) through the connecting flange sleeve (2).

3. The auxiliary positioning device for welding steel casings in karst cave pile foundation construction according to claim 1, characterized in that: The lifting drive unit includes N lifting drive components, where N is a positive integer. The N lifting drive components are arranged equidistantly around the top limiting sleeve (4) in the circumferential direction. The fixed part of each lifting drive component is located on the top of the base plate (1) and is detachably connected to the base plate (1). The movable part of each lifting drive component is located on the outer circular surface of the top limiting sleeve (4) and is detachably connected to the top limiting sleeve (4).

4. The auxiliary positioning device for welding steel casings in karst cave pile foundation construction according to claim 3, characterized in that: The value of N ranges from 3 to 6.

5. The auxiliary positioning device for welding steel casings in karst cave pile foundation construction according to claim 4, characterized in that: The lifting drive assembly includes a longitudinal hydraulic push rod (5), a horizontal connecting rod (6), and a connecting arc plate (7). The longitudinal hydraulic push rod (5) is erected vertically at the top edge of the base plate (1), and the cylinder of the longitudinal hydraulic push rod (5) is detachably connected to the base plate (1). The horizontal connecting rod (6) is set on the piston rod end of the longitudinal hydraulic push rod (5), and one end of the horizontal connecting rod (6) is detachably connected to the piston rod end of the hydraulic push rod (5) by bolts. The connecting arc plate (7) is set on the other end of the horizontal connecting rod (6), and the outer side of the connecting arc plate (7) is fixedly connected to the horizontal connecting rod (6). The inner side of the connecting arc plate (7) is close to the top limiting sleeve (4) and is detachably connected to the top limiting sleeve (4) by bolts.

6. The auxiliary positioning device for welding steel casing in karst cave pile foundation construction according to claim 5, characterized in that: The lifting drive assembly also includes a pneumatic bracing mechanism (9), which is located between the longitudinal hydraulic push rod (5) and the horizontal connecting rod (6). One end of the pneumatic bracing mechanism (9) is detachably connected to the cylinder of the longitudinal hydraulic push rod (5) facing the bottom limit sleeve (3), and the other end of the pneumatic bracing mechanism (9) is detachably connected to the bottom of the horizontal connecting rod (6).

7. The auxiliary positioning device for welding steel casing in karst cave pile foundation construction according to claim 6, characterized in that: The pneumatic diagonal bracing mechanism (9) includes a first hinge seat (91), a pneumatic strut (92), and a second hinge seat (93). The first hinge seat (91) is located at the bottom of the horizontal connecting rod (6) and is detached from the horizontal connecting rod (6) by bolts. The second hinge seat (93) is located on the side of the longitudinal hydraulic push rod (5) facing the bottom limiting sleeve (3) and is detached from the cylinder of the longitudinal hydraulic push rod (5) by bolts. The pneumatic strut (92) is obliquely arranged between the first hinge seat (91) and the second hinge seat (93), and the extension end of the pneumatic strut (92) is hinged to the first hinge seat (91), and the housing end of the pneumatic strut (92) is hinged to the second hinge seat (93).

8. The auxiliary positioning device for welding steel casing in karst cave pile foundation construction according to claim 7, characterized in that: Two lifting lugs (8) are provided at equal intervals along the circumference of the top of the base plate (1), and each lifting lug (8) is threadedly connected to the base plate (1).

9. An auxiliary positioning device for welding steel casings in karst cave pile foundation construction according to claim 8, characterized in that: Rubber gaskets are attached to the top of the bottom limiting sleeve (3) and the bottom of the top limiting sleeve (4).

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