Sleeve screw pile device suitable for high-water-content soft stratum

Abstract

The utility model relates to a sleeve screw pile device suitable for a high-water-content soft stratum. The sleeve screw pile device comprises a drill bit screw system and a sleeve protection system. The sleeve protection system is composed of a drill bit protection sleeve, a threaded rod supporting sleeve and a cylindrical sleeve without a threaded rod. The drill bit screw system is composed of a drill bit, a threaded rod and an unthreaded straight rod. The drill bit is connected with a threaded connecting hole in the drill bit protection sleeve through a motor rotation adjusting connecting bolt; grouting channels are formed in the drill bit, the threaded rod and the unthreaded straight rod; a plurality of grouting holes are formed in the drill bit, a plurality of lubricating holes are formed in the threaded rod, and the sleeve screw pile device can avoid hole collapse and hole shrinkage caused by soil pressure during rotary grouting; underground water can be isolated, slurry flow is restrained, and soil and water source pollution is prevented; the sleeve is high in strength and rigidity and capable of bearing large vertical and horizontal loads, stability of the pile foundation is guaranteed, and structural deformation is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of foundation treatment, and particularly relates to a sleeve screw pile device suitable for high water content soft stratum. BACKGROUND

[0002] As a new type of pile foundation, screw piles have been widely used and rapidly developed in the field of engineering construction in recent years. Screw piles have the characteristics of simple construction, environmental friendliness, high bearing capacity, etc. Compared with traditional pile foundations, screw piles have the following advantages: no large equipment is needed for construction, and the construction can be operated in a narrow space, reducing the difficulty and cost; the installation process is basically noiseless and vibration-free, and has little impact on the environment, making it suitable for densely populated urban areas and environmentally sensitive areas; the spiral plate design gives it high lateral bearing capacity and uplift capacity, meeting the needs of complex working conditions.

[0003] At present, screw piles face great challenges in soft soil stratum construction. The bearing capacity of soft soil is low and prone to deformation, which may cause the concrete of the pile body to be squeezed during pouring, resulting in a decrease in pile diameter, i.e., the phenomenon of diameter reduction. In addition, the groundwater level in soft soil stratum is active frequently, which can affect the setting of concrete and further cause defects in the pile body, leading to pile breakage. UTILITY MODEL CONTENTS

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a sleeve screw pile device suitable for high water content soft stratum.

[0005] The utility model aims to achieve the following technical solutions:

[0006] A sleeve screw pile device suitable for high water content soft stratum is composed of a drill bit screw system and a sleeve protection system;

[0007] As a preferred embodiment, the sleeve protection system is composed of a drill bit protection sleeve, a threaded rod support sleeve, and a non-threaded rod cylindrical sleeve; the lower end of the threaded rod support sleeve is connected to the drill bit protection sleeve through welding, and the upper end of the threaded rod support sleeve is connected to the non-threaded rod cylindrical sleeve; the drill bit screw system is composed of a drill bit, a threaded rod, and a non-threaded straight rod, which are sequentially arranged and connected into a whole through welding; the drill bit is connected to the threaded connecting hole on the drill bit protection sleeve through the extension of the motor forward and reverse rotation adjusting connecting bolt;

[0008] As a preferred embodiment, the upper threaded part of the drill bit is designed to match the size of the upper threaded part of the drill bit protection sleeve, and the drill bit is tightly fitted into the drill bit protection sleeve after being completely installed, and the motor is connected to the threaded connecting hole through the connecting bolt;

[0009] As a preferred embodiment, the drill bit, the threaded rod, and the non-threaded straight rod are all provided with grouting channels with the same diameter inside;

[0010] Preferably, the drill bit has multiple grouting holes, and the threaded rod has multiple lubrication holes. This invention has the following features and beneficial effects.

[0011] 1. The sleeve protection system adopted in this utility model has a threaded structure that allows the concrete to reliably form a threaded shape, effectively avoiding the probability of the soil around the pile body being squeezed inward under the action of soil pressure during rotary grouting, resulting in hole collapse and diameter reduction. This can solve the problem of applicability in soft soil areas.

[0012] 2. The sleeve protection system adopted in this utility model can form a water-proof environment to avoid the impact of groundwater activity on the pile concrete, while restricting the flow of grout to prevent the grout from polluting the soil and water sources.

[0013] 3. This utility model utilizes a steel pipe sleeve, which possesses high strength and rigidity, enabling it to withstand significant vertical and horizontal loads. When subjected to vertical loads, it effectively transfers the load from the superstructure to the deep foundation; when subjected to horizontal loads, its excellent bending resistance ensures the stability of the pile foundation and reduces structural deformation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the rotary grouting of this utility model;

[0016] Figure 3 This is a schematic diagram showing the connection between the drill bit and the drill bit protective sleeve of this utility model.

[0017] Figure label:

[0018] 1. Drill bit protective sleeve; 2. Threaded rod support sleeve; 3. Unthreaded rod cylindrical sleeve; 4. Drill bit; 5. Threaded rod; 6. Unthreaded straight rod; 7. Motor; 8. Connecting bolt; 9. Threaded connection hole; 10. Grouting channel; 11. Grouting hole; 12. Lubrication hole. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with the illustrations, further elaborates on this utility model.

[0020] like Figure 1 As shown, this utility model embodiment provides a sleeve screw pile device suitable for soft strata with high water content, which consists of two parts: a drill bit screw system and a sleeve protection system.

[0021] The sleeve protection system consists of a drill bit protection sleeve 1, a threaded rod support sleeve 2, and a threadless rod cylindrical sleeve 3. The lower end of the threaded rod support sleeve 2 is connected to the drill bit protection sleeve 1 by welding, and the upper end of the threaded rod support sleeve 2 is connected to the threadless rod cylindrical sleeve 3. The drill bit screw system consists of a drill bit 4, a threaded rod 5, and a threadless straight rod 6, which are arranged in sequence and connected by welding to form a whole. The drill bit 4 extends through the forward and reverse rotation of the motor 7 to adjust the extension of the connecting bolt 8, and the drill bit 4 is connected and fixed to the threaded connection hole 9 on the drill bit protection sleeve 1.

[0022] The upper threaded portion of the drill bit 4 is designed to match the upper threaded portion of the drill bit protective sleeve 1. After the drill bit 4 is fully inserted into the drill bit protective sleeve 1, it fits tightly. The motor 7 is directly opposite the threaded connection hole 9 and the connecting bolt 8.

[0023] The drill bit 4, the threaded rod 5, and the unthreaded straight rod 6 are all provided with grouting channels 10 of the same diameter inside;

[0024] The drill bit 4 has multiple grouting holes 11, and the threaded rod 5 has multiple lubrication holes 12.

[0025] When using it, please follow the steps below:

[0026] S1. Factory Prefabrication Stage: Based on the design drawings, the drill bit 4, threaded rod 5, and unthreaded straight rod 6 of the drill bit screw system of required length and diameter are welded together in the factory; the drill bit protective sleeve 1, threaded rod support sleeve 2, and unthreaded rod cylindrical sleeve 3 are fabricated according to the drill bit screw system and welded together.

[0027] S2. On-site installation stage: At the construction site, rotate the drill bit screw system into the sleeve protection system. After the drill bit 4 is fully inserted into the drill bit protection sleeve 1, align the motor 7 with the threaded connection hole 9 and control the motor 7 to rotate forward so that the connecting bolt 8 enters the threaded connection hole 9 of the drill bit protection sleeve 1 to complete the fixed connection. Connect the unthreaded straight rod 6 to the auger pile driver to complete the connection between the drill bit screw system and the auger pile driver.

[0028] S3, Rotary Extrusion Stage: Place the screw pile vertically in the predetermined position, start the screw pile machine, and use the screw pile machine to drive the drilling rig screw system to rotate and extrude the soil to form a hole.

[0029] S4. Rotary Grouting Stage: After hole formation, motor 7 reverses to rotate connecting bolt 8 out of threaded connection hole 9 of drill bit protective sleeve 1, releasing the fixed connection. Lubricating fluid is sprayed from lubrication hole 12 to reduce rotational resistance. The auger pile driver rotates, and the drill bit screw system rotates and lifts. During this process, concrete is pumped into the sleeve protection system through grouting channel 10 and grouting hole 11 to form the pile body. Before the concrete initially sets, the reinforcing cage is placed into the sleeve protection system. The upper part of the reinforcing cage has a reserved reinforcing bar section.

Claims

1. A sleeve bolt pile device suitable for soft strata with high water content, characterized in that: It consists of two parts: a drill bit screw system and a sleeve protection system; The sleeve protection system consists of a drill bit protection sleeve (1), a threaded rod support sleeve (2), and a threadless rod cylindrical sleeve (3); the lower end of the threaded rod support sleeve (2) is connected to the drill bit protection sleeve (1) by welding, and the upper end of the threaded rod support sleeve (2) is connected to the threadless rod cylindrical sleeve (3); the drill bit screw system consists of a drill bit (4), a threaded rod (5), and a threadless straight rod (6), which are arranged in sequence and connected by welding to form a whole; the drill bit (4) extends through the forward and reverse rotation adjustment connecting bolt (8) of the motor (7), and the drill bit (4) is connected and fixed to the threaded connection hole (9) on the drill bit protection sleeve (1).

2. The sleeve bolt pile device suitable for soft strata with high water content as described in claim 1, characterized in that, The upper threaded portion of the drill bit (4) matches the design dimensions of the upper threaded portion of the drill bit protective sleeve (1). After the drill bit (4) is fully inserted into the drill bit protective sleeve (1), it fits tightly. The motor (7) is directly opposite the threaded connection hole (9) and the connecting bolt (8).

3. The sleeve bolt pile device suitable for soft strata with high water content as described in claim 1, characterized in that, The drill bit (4), threaded rod (5), and unthreaded straight rod (6) are all provided with grouting channels (10) of the same diameter inside.

4. The sleeve bolt pile device suitable for soft strata with high water content as described in claim 1, characterized in that, The drill bit (4) has multiple grouting holes (11), and the threaded rod (5) has multiple lubrication holes (12).

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