Steel casing anti-settlement deviation device for punching pile construction in karst area

Abstract

This utility model discloses a steel casing anti-settlement and deviation device for bored pile construction in karst areas, comprising: a casing positioning component with positioning holes for limiting the steel casing; and a frame component including a frame body and a first platform plate, both the first platform plate and the casing positioning component being mounted on the frame body. The first platform plate is provided with a mud guide channel, wherein the mud outlet at one end of the mud guide channel leads to the lower part of the casing positioning component, and the mud inlet at the other end of the mud guide channel leads to the edge of the frame body. This utility model is applicable to extreme geological conditions such as soft soil, karst caves, and easily collapsible boreholes. It is highly mobile and effectively reduces the number of times the steel casing deviates and settles during bored pile construction in karst areas, ensuring the verticality of the pile and the stability of the steel casing, guaranteeing construction efficiency and schedule, and facilitating the extraction and reuse of the steel casing, thus reducing construction costs.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a steel casing anti-settlement and deviation device for bored pile construction in karst areas. Background Technology

[0002] Drilled pile foundations are a deep foundation construction method that uses impact drilling rigs to break up rock and soil, forming pile holes and then pouring concrete into them. They are widely used in high-rise buildings, bridges, docks, and other projects, and have significant advantages in complex geological conditions such as karst, pebble layers, and hard layers. However, in loose strata or karst areas, steel casings are required for wall protection to prevent borehole collapse during construction. In extremely soft silt layers, long casings are necessary. For example, the Guangdong and Guangxi regions are among the most typical karst landforms in my country, where steel casings are prone to displacement and settlement under these geological conditions. Common solutions include: backfilling and compacting clay layers around the pile foundation to avoid voids, and, if necessary, reinforcing the outside of the steel casing with a concrete retaining ring; or installing guide frames and stabilizing devices, using rigid guide frames such as steel frames to fix the upper part of the casing and reduce hammer vibration displacement; or welding anti-displacement ribs to the bottom of the steel casing to increase resistance to lateral movement. However, in actual construction, these solutions are not always entirely applicable. For projects with a large number of pile foundations, shallow soil cavities, karst caves, and isolated boulders, backfilling and compacting clay layers around the pile foundations and reinforcing them with concrete rings cast outside the steel casing is inconvenient, leads to a surge in costs, affects construction efficiency, and significantly increases the construction period. Rigid guide frames are only suitable for large-diameter deep casings such as bridge and offshore platform pile foundations, requiring the use of large lifting equipment. For small or temporary constructions, the cost is too high. Moreover, for extreme geological conditions such as soft soil, karst caves, and easily collapsible holes, guide frames cannot completely restrain the bottom displacement of the casing. For ultra-deep casings, multi-layer segmented guidance is required, necessitating multiple disassemblies and reassemblies, reducing efficiency.

[0003] During construction, complex geological conditions such as shallow soil cavities, isolated boulders, and hard rock can cause steel casings to settle or shift, leading to pile hole deviation and collapse, or making it difficult to pull out the steel casing. This affects the verticality of the pile and the construction period, increasing construction costs. In the karst regions of Guangdong and Guangxi, the probability of settlement and displacement of steel casings is even higher. To prevent displacement and settlement of steel casings, ensure construction quality, guarantee the construction period, and control construction costs, this utility model proposes a novel anti-settlement and displacement device for steel casings to solve the above problems. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide a steel casing anti-settlement and deviation device for bored pile construction in karst areas. This device is suitable for extreme geological conditions such as soft soil, karst caves, and easily collapsible boreholes. It is highly mobile and effectively reduces the number of times the steel casing deviates and settles during bored pile construction in karst areas, ensuring the verticality of the pile and the stability of the steel casing, guaranteeing construction efficiency and schedule. Simultaneously, it facilitates the extraction and reuse of the steel casing, reducing construction costs.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A steel casing anti-settlement and deviation device for bored pile construction in karst areas includes:

[0007] The casing positioning assembly is equipped with positioning holes to restrict the steel casing;

[0008] The frame assembly includes a frame body and a first platform plate. The first platform plate and the casing positioning assembly are both disposed on the frame body. The first platform plate is provided with a mud guide channel. The mud outlet at one end of the mud guide channel leads to the lower part of the casing positioning assembly, and the mud inlet at the other end of the mud guide channel leads to the edge of the frame body.

[0009] Preferably, the sleeve positioning assembly includes a first flap and a second flap. One side of the first flap is hinged to the edge of the first platform plate, and the other side of the first flap is provided with a semi-circular clearance. One side of the second flap is hinged to the frame assembly, and the other side of the second flap is provided with a semi-circular clearance. The semi-circular clearances of the first flap and the second flap form a positioning hole.

[0010] Preferably, the inner diameter of the positioning hole is greater than or equal to the outer diameter of the steel casing.

[0011] More preferably, the frame assembly further includes a second platform plate. Along the longitudinal direction of the frame, the first platform plate, the protective sleeve positioning assembly, and the second platform plate are sequentially disposed on the frame body. The first platform plate is hinged to the first flap, and the second platform plate is hinged to the second flap.

[0012] Preferably, the frame body includes transverse connectors and longitudinal connectors, and two transverse connectors are connected to two longitudinal connectors to form the main structure.

[0013] More preferably, the frame body further includes fixed support members, and fixed support members are respectively provided at the four corners of the bottom surface of the main structure.

[0014] More preferably, the transverse connector is disposed above the longitudinal connector.

[0015] More preferably, the first platform plate includes a flat plate and a channel steel member. Two flat plates are disposed on both sides of the channel steel member. One side of the flat plate is fixedly connected to the upper edge of the channel steel member, and the other edge of the flat plate is fixedly connected to the longitudinal connecting member. The internal space of the channel steel member forms a mud guiding groove.

[0016] Preferably, the second platform plate is a flat plate structure, or the second platform plate is also provided with a mud guide trough.

[0017] Preferably, the first flap is hinged to the first platform plate via a hinge structure, and the second flap is hinged to the second platform plate via a hinge structure.

[0018] Beneficial effects:

[0019] This invention is applicable to extreme geological conditions such as soft soil, karst caves, and easily collapsible boreholes. It can be used in conjunction with drilling machines, does not occupy additional space, does not require additional lifting equipment, is highly mobile, and is highly compatible with construction machinery and equipment. This invention can reduce the number of times the steel casing deviates and settles during the construction of bored cast-in-place piles in karst areas, ensure the verticality of the pile body and the stability of the steel casing, guarantee construction efficiency and construction period, and reduce construction costs. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic diagram of this utility model;

[0021] Figure 2 The diagram shown illustrates the connection between this utility model and the steel casing.

[0022] Figure 3 The diagram shown is a schematic diagram of the present invention during construction.

[0023] Attached reference numerals: 1-Steel casing anti-settlement and deviation device, 2-Steel casing, 3-Mud pit, 4-Punching machine, 5-Concrete truck;

[0024] 11-First platform plate, 12-Mud guide channel, 13-Transverse connector, 14-Longitudinal connector, 15-Fixed support, 16-Second platform plate, 17-First flap, 18-Second flap, 19-Positioning hole, 111-Flat plate, 112-Channel steel component. Detailed Implementation

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0026] like Figure 1-3 As shown, this utility model proposes a steel casing anti-settlement and deviation device 1 for bored pile construction in karst areas, including a frame assembly and a casing positioning assembly. The frame assembly includes a frame body and a first platform plate 11, which is disposed on the frame body. The casing positioning assembly is disposed on the frame assembly and has positioning holes 19 for restricting the steel casing 2. The technical solution of this utility model is described in detail below with specific structural features.

[0027] like Figure 1-2 As shown, the frame body includes transverse connectors 13, longitudinal connectors 14, and fixed support members 15. Two transverse connectors 13 and two longitudinal connectors 14 are connected to form the main structure. Preferably, the main structure is rectangular, and fixed support members 15 are respectively provided at the four corners of the bottom surface of the main structure to fix the frame body on the construction plane.

[0028] The main structure of the frame serves as the load-bearing point of the platform, used for installing the first platform plate 11 and the protective cylinder positioning assembly. Preferably, both the transverse connecting member 13 and the longitudinal connecting member 14 are made of I-beams. The transverse connecting member 13 is positioned above the longitudinal connecting member 14, meaning that the bottom end of the transverse connecting member 13 is welded to the top end of the longitudinal connecting member 14. The fixed support member 15 is positioned on the bottom end of the longitudinal connecting member 14. The fixed support member 15 can be a steel pipe. The materials used to prepare the frame of this invention are readily available, and the preparation is simple, allowing for the rapid construction of a reliable support platform.

[0029] The fixed support component 15 of the frame body can withstand extreme geological conditions such as soft soil, karst caves, and easily collapsible holes.

[0030] like Figure 1-2 As shown, along the longitudinal direction of the frame body, the first platform plate 11 and the casing positioning assembly are sequentially arranged on the frame body. The casing positioning assembly is provided with a positioning hole 19 for positioning the casing in the middle. The first platform plate 11 is provided with a mud guide groove 12. The mud outlet at one end of the mud guide groove 12 leads to the bottom of the casing positioning assembly, and the mud inlet at the other end of the mud guide groove 12 leads to the edge of the frame body.

[0031] Preferably, the mud guide channel 12 is arranged longitudinally along the first platform plate 11, that is, the mud guide channel 12 is arranged longitudinally along the frame. The function of the mud guide channel 12 is to guide the mud into the side of the steel casing 2 to complete the grouting. The arrangement of the mud inlet of the mud guide channel 12 on the side of the frame is related to the frame structure, such as... Figure 1 As shown, since the transverse connector 13 is above the longitudinal connector 14, the bottom surface of the first platform plate 11 and the transverse connector 13 are on the same plane, and the mud guide channel 12 is formed by a downward recess on the surface of the first platform plate 11. That is, the mud guide channel 12 is entirely below the transverse connector 13. The mud inlet of the mud guide channel 12 is exposed on the frame, and there is no need to open a hole on the side of the frame to communicate with the mud inlet, so as to avoid damaging the structure of the frame.

[0032] In this invention, the first platform plate 11 is formed on a frame to facilitate the movement and standing of construction workers. Construction workers use the first platform plate 11 to channel mud.

[0033] Preferably, the first platform plate 11 includes a flat plate 111 and a channel steel member 112. The two flat plates 111 are disposed on both sides of the channel steel member 112. One side of the flat plate 111 is fixedly connected to the upper edge of the channel steel member 112, and the other edge of the flat plate 111 is fixedly connected to the longitudinal connecting member 14. The internal space of the channel steel member 112 forms a mud guiding groove 12.

[0034] Preferably, the frame assembly further includes a second platform plate 16. Along the longitudinal direction of the frame, the first platform plate 11, the casing positioning component, and the second platform plate 16 are sequentially arranged on the frame body. The second platform plate 16 is preferably a flat plate structure without a mud guide channel 12, providing sufficient operating area for construction personnel. The figure shows the second platform plate 16 without a mud guide channel 12. Preferably, the second platform plate 16 may also have another mud guide channel 12. It should be noted that the placement of the second platform plate 16 depends on the construction space. When there is sufficient space at the construction location, a larger frame body can be built, and the second platform plate 16 can be placed on this basis. When the space at the construction location is insufficient, the second platform plate 16 can be omitted, and the grouting construction can be achieved through the cooperation of the first platform plate 11 and the casing positioning component.

[0035] like Figure 1-3 As shown, the casing positioning assembly has a positioning hole 19 in the middle. The inner diameter of the positioning hole 19 is greater than or equal to the outer diameter of the steel casing 2. Before the grouting construction, the top of the steel casing 2 passes through the positioning hole 19 of the casing positioning assembly, and is thus restricted by the casing positioning assembly, maintaining its position unchanged during the grouting process.

[0036] Furthermore, to facilitate the connection between the casing positioning assembly and the steel casing 2, the casing positioning assembly includes a first flap 17 and a second flap 18. One side of the first flap 17 is hinged to the edge of the first platform plate 11, and the other side of the first flap 17 is provided with a semi-circular clearance. One side of the second flap 18 is hinged to the frame assembly, and the other side of the second flap 18 is provided with a semi-circular clearance. The semi-circular clearances of the first flap 17 and the second flap 18 form a positioning hole 19.

[0037] It is easy to understand that when the frame assembly does not have a second platform plate 16, the second flap 18 is hinged to the transverse connecting piece 13 of the frame assembly. When the frame assembly has a second platform plate 16, the second flap 18 is hinged to the edge of the second platform plate 16, similar to the connection method of the first flap 17 and the first platform plate 11.

[0038] like Figure 1 As shown, the first flap 17 is hinged to the first platform plate 11 via a hinge structure, and the second flap 18 is hinged to the second platform plate 16 via a hinge structure. The frame assembly of this utility model has a simple structure and is easy to assemble and install.

[0039] Figure 1-3 The image shows the case where the first platform plate 11 and the second platform plate 16 are simultaneously installed, and this will be used as an example for explanation. The first platform plate 11 and the second platform plate 16 are spaced apart by a distance, which is the location for installing the protective sleeve positioning assembly. The first flap 17 is hinged to the edge of the first platform plate 11, and the second flap 18 is hinged to the edge of the second platform plate 16. When both the first flap 17 and the second flap 18 are in a horizontal state, they are supported by two longitudinal connecting members 14 of the frame body. When the first flap 17 and the second flap 18 are opened, the holes below the frame body are exposed.

[0040] The flap-type casing positioning assembly is beneficial for the welding construction of steel casings, especially ultra-deep casings. For example... Figure 3As shown, the punching machine 4 and the concrete truck 5 are arranged on both sides of the steel casing anti-settlement misalignment device 1. The construction process of this utility model is as follows: At the construction site, after the rotary drilling rig is used to enlarge the hole, the lifting platform uses cross positioning or laser positioning to align the center of the steel casing anti-settlement misalignment device 1 with the pile core. The verticality of the steel casing anti-settlement misalignment device 1 is adjusted using a level, and the mud guide trough 12 of the steel casing anti-settlement misalignment device 1 is aligned with the mud pool 3 of the construction pile foundation. Then, the steel casing anti-settlement misalignment device 1 is lowered vertically and positioned and fixed on the construction plane by the fixed support members 15 at the four corners of the steel casing anti-settlement misalignment device 1. Open the first flap 17 and the second flap 18 inside the steel casing anti-settlement and deviation device 1, pass the first section of steel casing 2 through the frame body, weld the lifting lugs to the top side of the first section of steel casing 2 to support it on the longitudinal connecting member 14 of the frame body, and then hoist the second section of steel casing 2 above the first section of steel casing 2. After welding the two sections of steel casing 2 into a whole, lower the whole to the required depth, and then flip the first flap 17 and the second flap 18 back to their original positions to fix and vertically guide the whole steel casing 2. If it is necessary to lengthen the steel casing 2, repeat the above steps.

[0041] This utility model adopts a "flat rigid guide frame" structure. The frame body is flatter than the traditional rigid guide frame, does not occupy extra space, and is convenient for welding the casing and pouring concrete. It is fixed to the construction surface by four corner support members 15, forming a new rigid frame with the soil below to jointly bear the shear force caused by the horizontal displacement of the bottom steel casing 2 and the tensile force caused by vertical settlement, thus transferring part of the traditional rigid guide frame on the ground to the underground.

[0042] This utility model preferably adopts a "one-way opening and closing movable buckle plate" structure. The upward opening and closing flip-plate structure can be used to erect and lock the steel casing 2 platform. When welding and lengthening, the steel casing 2 can be lifted in one direction for extension. There are no complicated other installation procedures, ensuring construction continuity. At the same time, the movable buckle plate can be adjusted and installed according to the pile diameter to ensure reuse rate.

[0043] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A steel casing anti-settlement deviation device for the construction of a bored pile in a karst area, characterized in that, include: The casing positioning assembly is provided with positioning holes (19) for restricting the steel casing (2); The frame assembly includes a frame body and a first platform plate (11). The first platform plate (11) and the casing positioning assembly are both disposed on the frame body. The first platform plate (11) is provided with a mud guide groove (12). The mud outlet at one end of the mud guide groove (12) leads to the bottom of the casing positioning assembly, and the mud inlet at the other end of the mud guide groove (12) leads to the edge of the frame body.

2. A steel casing anti-setback device (1) according to claim 1, characterized in that The casing positioning assembly includes a first flap (17) and a second flap (18). One side of the first flap (17) is hinged to the edge of the first platform plate (11), and the other side of the first flap (17) is provided with a semi-circular clearance. One side of the second flap (18) is hinged to the frame assembly, and the other side of the second flap (18) is provided with a semi-circular clearance. The semi-circular clearances of the first flap (17) and the second flap (18) form a positioning hole (19).

3. A steel-cased anti-setback deflection device according to claim 2, characterised in that, The inner diameter of the positioning hole (19) is greater than or equal to the outer diameter of the steel casing (2).

4. The steel casing anti-settlement deviation device according to claim 2, wherein, The frame assembly also includes a second platform plate (16). Along the longitudinal direction of the frame, the first platform plate (11), the protective cylinder positioning assembly and the second platform plate (16) are sequentially disposed on the frame body. The first platform plate (11) is hinged to the first flap (17), and the second platform plate (16) is hinged to the second flap (18).

5. A steel-casing anti-setback deflection device according to any one of claims 1 to 4, characterised in that, The frame body includes a transverse connector (13) and a longitudinal connector (14), and the two transverse connectors (13) and the two longitudinal connectors (14) are connected to form the main structure.

6. A steel casing anti-setback device according to claim 5, wherein, The frame body also includes fixed support members (15), and fixed support members (15) are respectively provided at the four corners of the bottom surface of the main structure.

7. The steel casing anti-setback device of claim 5, wherein, The transverse connector (13) is positioned above the longitudinal connector (14).

8. The steel casing anti-setback device of claim 5, wherein, The first platform plate (11) includes a flat plate (111) and a channel steel member (112). The two flat plates (111) are disposed on both sides of the channel steel member (112). One side of the flat plate (111) is fixedly connected to the edge of the channel steel member (112), and the other edge of the flat plate (111) is fixedly connected to the longitudinal connecting member (14). The internal space of the channel steel member (112) forms a mud guiding groove (12).

9. The steel casing anti-setback device of claim 4, wherein, The second platform plate (16) is a flat plate structure.

10. The anti-settlement and misalignment device for steel casing according to claim 4, characterized in that, The second platform plate (16) is also provided with a mud guide trough (12).

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