Precast pile end sinking assisting device

Abstract

The invention discloses a prefabricated pile end sinking assisting device which comprises a pile tip arranged at the prefabricated pile end, and a static pressure grouting device is arranged in the pile tip in a penetrating mode. The static pressure grouting device comprises a hole opening pipe, a plurality of holes are formed in the surface of the hole opening pipe, a fixing piece is arranged on the outer side of the hole opening pipe, and diaphragms are arranged between the hole opening pipe and the fixing piece and on the outer side of the fixing piece respectively. And a grouting pipe communicated with the perforated pipe is arranged in the precast pile in a penetrating manner. According to the method, the pile does not need to be sunk after hole guiding in advance, bentonite slurry or water can be injected into the static pressure grouting device, the strength of a soil body at the pile end can be lubricated and weakened, the pile pressing dynamic resistance of the precast pile is reduced, and therefore the construction speed is increased, and the construction cost is reduced; furthermore, after pile pressing is completed, the static pressure grouting device can be used for grouting the pile end of the precast pile, and therefore the bearing capacity of the pile end and the pile side of the precast pile is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation structures, and in particular to a prefabricated pile end sinking aid device. Background Art

[0002] Precast reinforced concrete piles are widely used due to their high bearing capacity, fast construction speed, reliable pile sinking quality and low cost. The static pile driving method is commonly used in precast pile construction because of its noise-free, vibration-free and small impact on the surrounding environment during construction.

[0003] In the prior art, when prefabricated piles encounter a thick hard soil interlayer during static pile driving, the piles are prone to failure to be pressed down. The solution commonly used in engineering is to pre-drill holes and then sink the piles. This not only has a slow construction speed and low efficiency, increases construction costs, but is also not conducive to controlling the bearing capacity of a single pile.

[0004] Therefore, how to design a prefabricated pile end sinking aid device to increase construction speed, reduce construction costs and ensure the bearing capacity of a single pile has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a precast pile end sinking aid device, which aims to reduce the dynamic resistance of pile driving, improve the efficiency of pile driving, and at the same time improve the bearing capacity of the pile end and pile side.

[0006] In order to achieve the above technical purpose, the present invention provides a precast pile end sinking aid device, comprising a pile tip arranged at the precast pile end, wherein a static pressure grouting device is inserted into the pile tip;

[0007] The static pressure grouting device comprises a perforated tube with a plurality of openings on its surface, a fixing plate is arranged on the outside of the perforated tube, and diaphragms are arranged between the perforated tube and the fixing plate and on the outside of the fixing plate respectively;

[0008] A grouting pipe communicating with the perforated pipe is penetrated in the prefabricated pile.

[0009] Preferably, the perforated tube is arranged along the pile tip sprinting direction and extends to the end of the pile tip sprinting end.

[0010] Preferably, the grouting pipe and the perforated pipe are an integrated structure.

[0011] Preferably, the fixing sheet is a C-shaped steel sheet, and the diaphragm is a rubber membrane.

[0012] Beneficial effects of the present invention:

[0013] Due to the above structural design, the present invention does not need to pre-drill holes before sinking piles. The static pressure grouting device can inject bentonite slurry or water to lubricate and weaken the soil strength at the pile end, reducing the dynamic resistance of the precast pile, thereby increasing the construction speed and reducing the construction cost; further, after the pile is driven, the static pressure grouting device can be used to perform grouting on the pile end of the precast pile, thereby increasing the bearing capacity of the pile end and pile side of the precast pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of the middle pile tip;

[0016] Figure 3 for Figure 2 Schematic diagram of the structure viewed from above;

[0017] Figure 4 It is a structural schematic diagram of the static pressure grouting device of the present invention;

[0018] Figure 5 for Figure 4 Schematic diagram of the structure of the middle hole tube;

[0019] Figure 6 for Figure 4 Schematic diagram of the structure of the middle fixing plate.

[0020] In the figure: 1 precast pile, 2 pile tip, 3 static pressure grouting device, 31 perforated pipe, 32 fixing plate, 33 diaphragm, 4 grouting pipe. DETAILED DESCRIPTION

[0021] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0022] Example:

[0023] like Figure 1-Figure 6 As shown, a specific embodiment of the precast pile end sinking aid device of the present invention comprises a pile tip 2 arranged at the end of the precast pile 1, and a static pressure grouting device 3 is penetrated in the pile tip 2.

[0024] The static pressure grouting device 3 includes a perforated tube 31 with a plurality of openings on its surface. A fixing plate 32 is arranged outside the perforated tube 31 . Diaphragms 33 are arranged between the perforated tube 31 and the fixing plate 32 and outside the fixing plate 32 .

[0025] A grouting pipe 4 communicating with the perforated pipe 31 is provided in the precast pile 1 .

[0026] The main innovation of the present invention is that the static pressure grouting device 3 can inject bentonite slurry or pressurized water, which can lubricate and weaken the strength of the soil at the pile end, reduce the dynamic resistance of the prefabricated pile 1, and improve the pile driving efficiency.

[0027] Specifically, the perforated tube 31 is arranged along the thrusting direction of the pile tip 2 and extends to the end of the thrusting end of the pile tip 2 .

[0028] The grouting pipe 4 and the perforated pipe 31 are an integrated structure.

[0029] In some embodiments, the perforated tube 31 is a steel tube with a hole, the fixing sheet 32 ​​is a C-shaped steel sheet, and the diaphragm 33 is a rubber membrane, which ensures the structural stability of the perforated tube 31 .

[0030] The working principle and use process of the present invention:

[0031] When it is difficult to press the precast pile 1, bentonite slurry or water is injected into the static pressure grouting device 3 through the grouting pipe 4. The bentonite slurry or pressurized water is injected through the pile tip 2, which lubricates and weakens the strength of the soil at the pile end, thereby reducing the dynamic resistance of the precast pile 1 to press the pile. After the pile is pressed, the static pressure grouting device 3 can be used to grout the pile end of the precast pile 1 to improve the bearing capacity of the pile end and pile side of the precast pile 1.

[0032] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A precast pile end sinking aid device, comprising a pile tip arranged at the end of the precast pile, characterized in that: A static pressure grouting device is provided inside the pile tip; The static pressure grouting device comprises a perforated tube with a plurality of openings on its surface, a fixing plate is arranged on the outside of the perforated tube, and diaphragms are arranged between the perforated tube and the fixing plate and on the outside of the fixing plate respectively; A grouting pipe communicating with the perforated pipe is penetrated in the prefabricated pile.

2. The precast pile end sinking aid device according to claim 1, characterized in that: The perforated tube is arranged along the pile tip sprinting direction and extends to the end of the pile tip sprinting end.

3. The precast pile end sinking aid device according to claim 1 or 2, characterized in that: The grouting pipe and the perforated pipe are an integrated structure.

4. The precast pile end sinking aid device according to claim 3, characterized in that: The fixing sheet is a C-shaped steel sheet, and the diaphragm is a rubber membrane.

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