CN-121992774-A - Composite lubrication sleeve with pile sinking soil plug reducing function

CN121992774ACN 121992774 ACN121992774 ACN 121992774ACN-121992774-A

Abstract

A composite lubricating sleeve with the function of reducing pile sinking soil plugs. The anti-drag device comprises a flexible substrate and a microstructure anti-drag layer which are compounded together, wherein the outer circumferential surface of the flexible substrate is attached to the inner circumferential surface of a prefabricated pipe pile, which is close to a pile shoe, solid lubricating particles are uniformly mixed in the inner circumferential surface of the prefabricated pipe pile, the microstructure anti-drag layer is composed of a plurality of micro-convex points which are regularly distributed on the inner circumferential surface of the flexible substrate in a lattice shape, and the solid lubricating particles are encapsulated in the micro-convex points. The invention can effectively reduce the pile sinking construction difficulty and equipment requirement, reduce the pile body deflection and equipment energy consumption caused by overlarge resistance, and directly save construction cost. The core innovation of the pile sinking method is that the blocking forming process is actively interfered by multiple synergistic mechanisms of solid particle lubrication, micro-bump blocking and micro-rolling, the controllability and the pile body perpendicularity of the pile sinking process are greatly improved, and the pile sinking quality is fundamentally improved. The composite lubrication sleeve has a unique technical path, and realizes the technical span from passive treatment to active prevention and control.

Inventors

YAN ZHIFENG
WANG QIAN
ZHAO JINLONG
ZHANG BAOCHEN
YANG XUEQING
YANG XIULIN
ZHANG BIN
HAN BAOJIAN
ZHOU FENG
LV JUNYING
LI XIAOYU
XUE YONGXING
MA LI
PAN WEN

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: 20260508
Application Date: 20260204

Claims (7)

1. A composite lubricating sleeve with a pile sinking soil plug reducing effect is characterized by comprising a flexible substrate (2) and a microstructure anti-drag layer which are compounded together, wherein the outer circumferential surface of the flexible substrate (2) is attached to the inner circumferential surface, close to a pile shoe, of a prefabricated pipe pile (1), solid lubricating particles (5) are uniformly mixed in the inner circumferential surface, the microstructure anti-drag layer is composed of a plurality of micro-salient points (4) which are regularly distributed on the inner circumferential surface of the flexible substrate (2) in a lattice shape, and the solid lubricating particles (5) are encapsulated in the micro-salient points (4).
2. The composite lubrication sleeve with the pile sinking soil plug reducing effect according to claim 1, wherein the flexible substrate (2) on the composite lubrication sleeve with the pile sinking soil plug reducing effect is adhered to the prefabricated pipe pile (1) by using an adhesive.
3. The composite wetting sleeve with the pile sinking soil plug reducing effect according to claim 1, further comprising a fixing ring (3) for fixing the lower end edge of the flexible substrate (2) at the starting end of the inner wall of the precast tubular pile (1) positioned on the upper side of the pile shoe.
4. The composite lubricating sleeve with pile sinking soil plug reducing effect according to claim 1, wherein the flexible substrate (2) is made of a high-strength high-elasticity thermoplastic polyurethane film.
5. The composite lubricating sleeve with pile sinking soil plug reducing effect according to claim 1, wherein the micro-convex points (4) forming the micro-structure drag reduction layer are formed on the inner circumferential surface of the flexible substrate (2) by adopting a mould pressing process.
6. The composite lubricating sleeve with the pile sinking soil plug reducing effect according to claim 1, wherein the solid lubricating particles (5) are nano-scale silicon dioxide, graphene or special polymer powder.
7. The composite lubricating sleeve with the pile sinking soil plug reducing effect according to claim 1, wherein the solid lubricating particles (5) are encapsulated in the micro-convex points (4) by adopting a microcapsule technology.

Description

Composite lubrication sleeve with pile sinking soil plug reducing function Technical Field The invention belongs to the technical field of auxiliary equipment for construction of prefabricated pipe piles in civil engineering, and particularly relates to a composite lubricating sleeve with a pile sinking soil plug reducing function, which is used for pile sinking operation of prefabricated pipe piles, reduces soil plug effect and reduces pile-soil friction resistance through a composite means. Background In the construction of building foundations, the prefabricated pipe piles are widely applied to foundation reinforcement. The prefabricated pipe pile is generally penetrated into foundation soil by hammering or static pressure and the like. However, in the penetration process, due to the resistance of the soil body, a soil plug is formed inside the precast tubular pile, so that the penetration force of the pile is greatly increased, the construction cost is increased, the construction period is prolonged, and even the quality of the pile foundation is affected. At present, high-pressure water flushing and other modes are generally adopted on construction sites to remove soil plugs, but the methods are time-consuming and labor-consuming and have certain construction risks. Therefore, how to reduce the influence of the formation of the soil plug in the precast tubular pile is a problem to be solved in industry. Disclosure of Invention In order to solve the problems, the invention aims to provide a composite lubricating sleeve with the function of reducing pile sinking soil plugs. In order to achieve the aim, the composite lubrication sleeve with the function of reducing pile sinking soil plugs comprises a flexible substrate and a microstructure anti-drag layer which are compounded together, wherein the outer circumferential surface of the flexible substrate is attached to the inner circumferential surface of a precast tubular pile, which is close to a pile shoe, solid lubrication particles are uniformly doped in the inner circumferential surface of the precast tubular pile, the microstructure anti-drag layer consists of a plurality of micro-salient points which are regularly distributed on the inner circumferential surface of the flexible substrate in a lattice shape, and the solid lubrication particles are encapsulated in the micro-salient points. The flexible substrate on the composite lubrication sleeve with the pile sinking soil plug reducing function is stuck on the prefabricated pipe pile by using an adhesive. The composite lubricating sleeve with the pile sinking soil plug reducing function further comprises a fixing ring which is used for fixing the edge of the lower end of the flexible substrate at the starting end of the inner wall of the prefabricated pipe pile positioned on the upper side of the pile shoe. The flexible substrate is made of a high-strength and high-elasticity thermoplastic polyurethane film. The micro-salient points forming the micro-structure drag reduction layer are formed on the inner circumferential surface of the flexible substrate by adopting a mould pressing process. The solid lubricating particles adopt nanoscale silicon dioxide, graphene or special polymer powder. The solid lubricating particles are encapsulated in the micro-convex points by adopting a microcapsule technology. The composite lubricating sleeve with the function of reducing pile sinking soil plugs has the following beneficial effects: The pile sinking construction difficulty and equipment requirements can be effectively reduced, the pile body deviation and equipment energy consumption caused by overlarge resistance are reduced, and the construction cost is directly saved. The core innovation of the pile sinking method is that the blocking forming process is actively interfered by multiple synergistic mechanisms of solid particle lubrication, micro-bump blocking and micro-rolling, the controllability and the pile body perpendicularity of the pile sinking process are greatly improved, and the pile sinking quality is fundamentally improved. The composite lubrication sleeve has a unique technical path, and realizes the technical span from passive treatment to active prevention and control. Drawings FIG. 1 is a schematic view of the use state of a composite lubrication sleeve with pile sinking soil plug reducing function. Detailed Description The invention will now be described in detail with reference to the drawings and specific examples. As shown in fig. 1, the composite lubrication sleeve with the pile sinking soil plug reducing effect comprises a flexible substrate 2 and a micro-structure drag reduction layer which are compounded together, wherein the outer circumferential surface of the flexible substrate 2 is attached to the inner circumferential surface, close to a pile shoe, of a precast tubular pile 1, solid lubrication particles 5 are uniformly mixed in the inner circumferential surface, the micro-struc