CN-121976522-A - Sinking-assisting negative-pressure pile cap for prefabricated pipe pile

Abstract

The invention discloses a prefabricated pipe pile sinking-assisting negative pressure pile cap, which comprises a pile cap main body, a vacuum pump, a storage battery, an automatic control unit, a pressure relief valve, a starting switch and a flexible sealing gasket. The pile sinking device not only maximizes the hammering energy transfer efficiency, obviously improves the pile sinking speed and reduces the energy consumption and equipment loss, but also actively delays the compaction of the soil plug through the lifting action of negative pressure, thereby reducing the construction difficulty and the sinking refusing risk of complex stratum. Meanwhile, the management of the pressure in the inner cavity of the tubular pile can be realized on the premise of not increasing the complexity of the piling process, the pile sinking efficiency is improved, the pile body opening is avoided, the structural integrity is ensured, the complexity of on-site operation is not increased, and the problems of section weakening and stress concentration caused by the opening on the pile body concrete structure or the steel pipe wall are avoided.

Inventors

• YAN ZHIFENG
• WANG SHUYU
• SUN YIMING
• LIU SEN
• MA LI
• YANG XIULIN
• LI XIAOYU
• CHEN XUEBIN
• ZHOU FENG
• ZHANG BIN
• LV JUNYING
• LIU ZHONGYOU
• XUE YONGXING
• WANG QIAN

Assignees

• 中铁北京工程局集团(天津)工程有限公司
• 中铁北京工程局集团有限公司

Dates

Publication Date

20260505

Application Date

20260204

Claims (4)

1. 1. A prefabricated pipe pile sinking-assisting negative pressure pile cap is characterized by comprising a pile cap main body (1), a vacuum pump (2), a storage battery (3), an automatic control unit (4), a pressure release valve (5), a starting switch (7) and a flexible sealing gasket (10), wherein the pile cap main body (1) is of a hollow cylinder structure, the edge of the lower end face of the pile cap main body downwards extends to form a circle of cap wall (11) for covering the top end of a prefabricated pipe pile (9), one side of the circumferential wall is provided with an exhaust hole (6), the other side of the circumferential wall is provided with a pressure release hole for installing the pressure release valve (5), a communication hole (8) is formed in the middle of the bottom surface, a vacuum pump (2), a storage battery (3) and an automatic control unit (4) are arranged in the pile cap main body (1), an air outlet of the vacuum pump (2) is connected with the exhaust hole (6) through a closed pipeline, the starting switch (7) is arranged outside the pile cap main body (1), a charging interface for charging the storage battery (3) is arranged in the pile cap main body, the automatic control unit (4) is respectively electrically connected with the vacuum pump (2), the storage battery (3) and the starting switch (7), the automatic control unit (3) is electrically connected with the storage battery (4) through the closed pipeline, the air outlet of the vacuum pump (2) is arranged in the vacuum pump (2) and the flexible sealing gasket (4) is arranged in the flexible sealing gasket (10), and the middle part is provided with an opening corresponding to the communication hole (8) on the pile cap main body (1).
2. 2. The prefabricated pipe pile sinking assisting negative-pressure pile cap according to claim 1, wherein the automatic control unit (4) adopts STM32 series microcontrollers as a main control chip and is matched with MPXV5004 series vacuum pressure sensors.
3. 3. The precast pile sinking-assisting negative-pressure pile cap according to claim 1, wherein the pile cap main body (1) is made of steel.
4. 4. The pile sinking assisting negative-pressure pile cap according to claim 1, wherein the flexible sealing gasket (10) is made of high-strength rubber materials.

Description

Sinking-assisting negative-pressure pile cap for prefabricated pipe pile Technical Field The invention belongs to the technical field of auxiliary equipment for construction of prefabricated pile foundations in civil engineering, and particularly relates to a prefabricated pile sinking-assisting negative-pressure pile cap which is used for construction of a prefabricated pile by a driving method, and can be used for improving pile sinking efficiency and reducing a soil plug effect by actively forming negative pressure in the prefabricated pile. Background When the precast concrete pipe pile or the steel pipe pile is sunk by a hammering or vibration method, a soil plug is formed in the pile pipe, and a part of air is sealed. With the penetration of the pile body, the air in the pipe is severely compressed, so that huge upward pressure is generated, the downward impact energy of the pile hammer is seriously counteracted, the pile sinking efficiency is greatly reduced, the number of the hammers is greatly increased, and even pile sinking safety accidents are caused. The traditional solution is to provide a venting hole on the pile body to release pressure, but the method not only increases the pile making process and weakens the structural section of the pile body, but also can not solve the friction resistance problem of the soil plug and the pipe wall. The blocking effect of the soil plug can significantly increase the total resistance of the pile sinking, and especially in a compact viscous soil layer, the pile body can be refused to sink in advance. At present, an integrated device capable of synchronously solving two problems of 'compressed air anti-jacking' and 'soil plug friction blocking' is not available in the industry, so that the construction efficiency and the cost control are restricted. Disclosure of Invention In order to solve the problems, the invention aims to provide a sinking-assisting negative-pressure pile cap for a precast tubular pile. The prefabricated pipe pile sinking-assisting negative-pressure pile cap comprises a pile cap body, a vacuum pump, a storage battery, an automatic control unit, a pressure relief valve, a starting switch and a flexible sealing gasket, wherein the pile cap body is of a hollow cylinder structure, the edge of the lower end face of the pile cap body extends downwards to form a circle of cap wall used for covering the top end of the prefabricated pipe pile, one side of the circumferential wall is provided with an exhaust hole, the other side of the circumferential wall is provided with a pressure relief hole used for installing the pressure relief valve, a communication hole is formed in the middle of the bottom face, the vacuum pump, the storage battery and the automatic control unit are arranged in the pile cap body, an air outlet of the vacuum pump is connected with the exhaust hole through a closed pipeline, the starting switch is arranged outside the pile cap body and is internally provided with a charging interface used for charging the storage battery, the automatic control unit is respectively electrically connected with the vacuum pump, the storage battery supplies power for the vacuum pump and the automatic control unit, the flexible sealing gasket is arranged at the upper part in the cap wall, and an opening corresponding to the communication hole in the pile cap body is formed in the middle. The automatic control unit adopts STM32 series micro controller as main control chip, and is matched with MPXV5004 series vacuum pressure sensor. The pile cap body is made of steel and has enough strength and rigidity to bear hammering load. The flexible sealing gasket is made of high-strength rubber materials, so that airtight sealing can be formed when the pile cap main body is buckled on the top end of the prefabricated pipe pile. The sinking-assisting negative-pressure pile cap for the prefabricated pipe pile has the following beneficial effects: Through the negative pressure pile cap of the integrated air extraction system, two large core resistance sources of pile sinking, namely the upward punching resistance of a compressed air cushion in a pile pipe and the upward friction of a soil plug, are synchronously and directly solved. The pile sinking device not only maximizes the hammering energy transfer efficiency, obviously improves the pile sinking speed and reduces the energy consumption and equipment loss, but also actively delays the compaction of the soil plug through the lifting action of negative pressure, thereby reducing the construction difficulty and the sinking refusing risk of complex stratum. Meanwhile, the negative pressure pile cap is used as a substitute device of the traditional pile cap, the management of the pressure in the inner cavity of the pipe pile can be realized on the premise of not increasing the complexity of the piling process, the pile sinking efficiency is improved, the pile body opening is avoided, the structural integrity