Self-drilling composite pile

Abstract

The utility model relates to the technical field of constructional engineering, in particular to a self-drilling composite pile which comprises a pile body, a pile tip and a transmission connecting part used for external driving, the pile tip is arranged at the bottom of the pile body, a manual driving device is arranged at the top of the pile body, the manual driving device and the pile body form an integral structure, and the pile body is driven by the manual driving device to rotatably drill in downwards; rotor wings are arranged on the pile body along a spiral line with a certain angle, and grouting holes are formed in the pile body. The self-drilling pile sinking device has the advantages that the pile body provided with the rotor wings is driven by a power device (or manpower) to sink the pile in a rock-soil body in a self-drilling mode, and self-drilling sinking can be achieved under the condition that an anchor rod cannot be arranged or back pressure is insufficient; (2) reinforcing liquid is injected into the soil body through the small holes formed in the strong body while the pile body is self-drilled, and the function of reducing friction resistance between the pile body and the rock-soil body is achieved in the self-drilling sinking process of the pile body, and (3) after the reinforcing liquid is injected into the rock-soil body and solidified, the pile body, the reinforcing liquid and the rock-soil body can form a composite body, and bearing force is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering, in particular to a self-drilling composite pile. Background Art

[0002] For pile supplement of existing buildings, the method of anchor jacked pile is generally adopted. However, in the case where it is impossible to set anchors or the counter-pressure is insufficient, it is difficult to solve the problem of pile supplement.

[0003] There are many methods to improve the bearing capacity of pile body by injecting reinforcement liquid into soil through the opening of pile body. However, there are few applications in pile supplement of existing buildings. How to achieve pile supplement by using a method with higher efficiency and lower cost in the field of existing building reinforcement is a technical problem to be solved urgently. Summary of the Invention

[0004] The purpose of the utility model is to provide a self-drilling composite pile according to the deficiencies of the above-mentioned prior art. By driving the pile body provided with rotors to self-drill and sink into the rock and soil body and injecting reinforcement liquid into the soil while the pile body is self-drilling, a composite body of the pile body, the rock and soil body and the reinforcement liquid is formed, effectively improving the efficiency and quality of pile supplement.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A self-drilling composite pile, characterized in that it includes a pile body, a pile tip and a transmission connection part for external connection and driving. The pile tip is arranged at the bottom of the pile body. The manual driving device is arranged at the top of the pile body and the two form an integral structure. The pile body rotates downward and drills under the drive of the manual driving device; rotors are arranged on the pile body along a spiral line at a certain angle, and grouting holes are opened on the pile body.

[0007] A reinforcement liquid injection channel is arranged inside the pile body, and the reinforcement liquid injection channel is communicated with the grouting holes.

[0008] A floating sealing device is arranged at the top position of the reinforcement liquid injection channel.

[0009] The transmission connection part includes a transmission member. The transmission member forms an integral structure with the pile body through a locking pin to realize the transmission of rotational force.

[0010] A manual transmission rod is arranged on the transmission member.

[0011] The angle spiral tail of the rotor forms an included angle of 30°-60° with the axis of the pile body.

[0012] The rotor is a continuous rotor or a discontinuous rotor.

[0013] A hole protector is arranged at the position of the grouting hole.

[0014] The advantages of the present utility model are as follows:

[0015] 1) The pile body with rotors can be driven by a power device (or manual force) to self-drill and sink in the rock and soil mass. It can self-drill and sink when it is impossible to set anchor bolts or the back pressure is insufficient.

[0016] 2) The reinforcement liquid is injected into the soil through the small holes provided on the pile body while the pile body is self-drilling, which plays a role in reducing the frictional resistance between the pile body and the rock and soil mass during the process of the pile body self-drilling and sinking.

[0017] 3) After the reinforcement liquid is injected into the rock and soil mass and solidifies, the pile body, the reinforcement liquid, and the rock and soil mass can form a composite body to provide bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic sectional view of the present utility model;

[0020] Figure 3 is a schematic structural diagram of an embodiment of the pile body part of the present utility model;

[0021] Figure 4 is a schematic structural diagram of an embodiment of the pile body part of the present utility model;

[0022] Figure 5 is a schematic structural diagram after the construction of the present utility model. SPECIFIC EMBODIMENTS

[0023] The features of the present utility model and other related features will be further described in detail through embodiments with reference to the accompanying drawings for the understanding of those skilled in the same industry:

[0024] As Figures 1-5 shown, the markings 1-12 in the figure respectively represent: pile body 1, rotor 2, grouting hole 3, hole protector 4, transmission member 5, manual transmission rod 6, pile tip 7, reinforcement liquid injection channel 8, floating seal device 9, locking pin 10, anchor bar 11, composite body 12.

[0025] Embodiment: As Figures 1 to 5 shown, the self-drilling composite pile in this embodiment is driven by an external rotational force (the rotational force can be provided by a motor, an oil motor or an engine) or the manual rotation rod 6 to drive the transmission member 5. The transmission member 5 transmits the rotational force to the pile body 1 through the locking pin 10 to drive the pile body 1 to rotate, realizing the self-drilling and sinking of the pile body 1.

[0026] In this embodiment, the rotor 2 is arranged on the pile body 1 along a spiral line at a certain angle (30°-60° with the pile axis). The rotor 2 can adopt such as Figure 3The continuous rotor shown or Figure 4 The discontinuous rotor shown. The rotor 2 can be arranged in multiple layers parallel to the pile length direction of the pile body 1, and parameters such as the spacing between each layer of rotors or the interval of discontinuous rotors can be adjusted according to the formation. The material of the rotor 2 can be metal, plastic, etc., and is connected to the pile body 1 by welding or bonding. The width of the rotor 2 should be 1 / 4 - 1 / 2 of the diameter of the pile body 1, and the thickness should be 1 / 10 - 1 / 20 of the width of the pile body 1. When the pile body 1 rotates, it drives the rotor 2 to cut the rock and soil body and rotate downward into the deep rock and soil body.

[0027] A conical pile tip 7 is provided at the lowermost end of the pile body 1 to facilitate the rotation and penetration of the pile body. Square, triangular and other shapes are used on the outer wall surface of the pile body 1 to set the grouting holes 3 at an interval of 10 cm - 30 cm. The diameter of the grouting hole 3 should be 6 mm - 12 mm. A semi-conical hole protector 4 is arranged on the grouting hole 3 in the rotation direction. The material of the hole protector 4 is metal or plastic, and it can be arranged at the position of the grouting hole 3 by welding or bonding to prevent soil from entering the pile body 1 and blocking the small hole 3 during the self-drilling process. The spacing of the small holes 3 within 1 / 10 of the pile length above the pile end of the pile body 1 should be controlled within 10 cm - 15 cm.

[0028] During the self-drilling process of the pile body 1, the reinforcement liquid is input into the pile body 1 through the reinforcement liquid injection channel 8 and the floating seal device 9, and the reinforcement liquid sprays out from the grouting hole 3. According to the needs of the formation conditions, the reinforcement liquid can be cement slurry, water glass solution, alkali solution, chemical mud, etc. On the one hand, the reinforcement liquid plays a role in lubricating and reducing the friction between the pile body 1 and the rock and soil body during the self-drilling and pile sinking process. On the other hand, after the pile sinking is completed, the reinforcement liquid penetrates into the surrounding rock and soil body and solidifies, forming a composite body 12 with the pile body 1 and the rock and soil body. The upper end of the composite body 12 is connected to the foundation through the anchor bars 11 welded or bonded to the pile body 1 to complete the foundation reinforcement work.

[0029] Although the above embodiments have detailed the concept and embodiments of the purpose of the present utility model with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present utility model without departing from the scope defined by the claims, so they will not be elaborated here one by one.

Claims

1. A self-drilling composite pile, characterized by: It includes a pile body, a pile tip and a transmission connection part for external drive. The pile tip is arranged at the bottom of the pile body, and the human-powered driving device is arranged at the top of the pile body and the two form an integral structure. The pile body is driven by the human-powered driving device to rotate downward and drill into the pile body. The pile body is provided with a rotor along a spiral line at a certain angle, and a grouting hole is opened on the pile body.

2. A self-drilling composite pile according to claim 1, characterized in that: A reinforcing liquid injection channel is provided inside the pile body, and the reinforcing liquid injection channel is communicated with the grouting hole.

3. A self-drilling composite pile according to claim 2, characterized in that: A floating sealing device is provided at the top of the reinforcing liquid injection channel.

4. The self-drilling composite pile according to claim 1, characterized in that: The transmission connection portion includes a transmission component, and the transmission component forms an integral structure with the pile body through a locking pin to achieve the transmission of rotational force.

5. A self-drilling composite pile according to claim 4, characterized in that: A human transmission rod is provided on the transmission component.

6. The self-drilling composite pile according to claim 1, characterized in that: The angle of the spiral tail of the rotor is 30°-60° with the axis of the pile body.

7. A self-drilling composite pile according to claim 1 or 6, characterized in that: The rotor is a continuous rotor or a discontinuous rotor.

8. The self-drilling composite pile according to claim 1, characterized in that: A hole protector is provided at the position of the grouting hole.

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