CN105317039A

CN105317039A - Pile sinking method for controlling pile group floating

Info

Publication number: CN105317039A
Application number: CN201410291831.9A
Authority: CN
Inventors: 尹兰宁; 曹杨; 王旭; 刘强; 代景艳
Original assignee: China MCC20 Group Corp Ltd
Current assignee: China MCC20 Group Corp Ltd
Priority date: 2014-06-26
Filing date: 2014-06-26
Publication date: 2016-02-10
Anticipated expiration: 2034-06-26
Also published as: CN105317039B

Abstract

The invention relates to pile foundation construction, in particular to a pile sinking method. The pile sinking method for controlling pile group floating comprises the steps that a construction order of firstly column foundation pile driving, secondly equipment foundation pile driving and finally floor pile driving is adopted, and large-area floor piles are driven from inside to outside, from near to far, every other rows and symmetrically to enable the soil layer to be as compact and uniform as possible; in the pile group driving process, the pipe driving number is controlled to be no more than 30 within every 1000 m<2> every day, and the pile sinking speed is controlled at 1 m/min; a screw-rod drilling machine is adopted to form 40 holes by evenly taking soil every 10000 m<2>, the soil taking hole diameter is 500 mm, and the soil taking depth h is larger than 10 m and smaller than 15 m; 10% of observing piles are arranged, the observing frequency is determined according to the pile driving condition around the observing piles, and a pile tip elevation change curve is drawn to supply a reference basis to the subsequent soil-taking hole forming number and the hole forming depth. According to the pile sinking method for controlling pile group floating, the pile floating phenomenon is effectively restrained, and the cost is low.

Description

Control the pile-sinking method that a clump of piles floats

Technical field

The present invention relates to pile foundation construction, particularly relate to a kind of pile-sinking method.

Background technology

In industrial premises piling construction process, after pile tube sinks to foundation soil, the soil body is disturbed, soil layer pore water pressure is caused to increase, soil body generation sidesway and protuberance, cause pile body of constructing to float (floating stake), in order to solve this problem with the soil body, Conventional countermeasures increases effective length, increase soil rigidity, reinforcement pile strength and pile joint quality, and these means cost compares are high.

Summary of the invention

The present invention is intended to the defect overcoming prior art, provides a kind of pile-sinking method controlling a clump of piles and float.The present invention makes floating stake phenomenon obtain effective containment, and cost is low.

In order to solve the problems of the technologies described above, a kind of pile-sinking method controlling a clump of piles and float, it comprises: the sequence of construction taking the stake of first injection patten, the stake of injection equipment Foundations again, last injection terrace stake, take from the inside to the outside during the stake of injection large-area terrace, by near to far away, beat every applying, the mode of symmetrical injection, make soil layer evenly compacted as far as possible; Control injection stake every day number within the scope of every 1000 ㎡ in clump of piles injection process and be no more than 30, pile sinking speeds control is at 1m/min; Every 10000 ㎡ adopt the even soil taking hole forming of screw rod rig 40, aperture of fetching earth is 500mm, and fetch earth degree of depth 10m < h < 15m; The observation stake of 10% quantity is set, determines to observe the frequency according to observation stake periphery piling situation, draw a top mark High variation curve, for follow-up soil taking hole forming quantity and depth of pore forming provide reference frame.

The present invention is to occurring that the situation such as pile sinking data, geology in floating stake region is analyzed, have developed for mud soil characteristics the pile-sinking method that an a kind of new control clump of piles floats: by selecting suitable piling order before pile sinking, and adopt churning driven power traction hole to fetch earth to carry out release to the soil body; Select suitable Piling speed in pile driving process, control the measures such as the stake day amount of burying, effectively can solve a floating stake difficult problem.With existing traditional increase effective length, increase soil rigidity, strengthen the measure of pile strength and pile joint quality compared with, greatly reduce measure cost, economic benefit and social benefit remarkable.

Detailed description of the invention

Control the pile-sinking method that a clump of piles floats, it comprises: incorporation engineering feature, to reduce rear piling soil compaction to the impact of first driving piles for principle.Take first injection post

The sequence of construction of the stake of foundation pile, injection equipment Foundations again, last injection terrace stake, the stake of injection large-area terrace is appropriate to the occasion to be taked from the inside to the outside, by near to far away, beat every applying, the mode of symmetrical injection, make soil layer evenly compacted as far as possible.

Control injection stake every day number within the scope of every 1000 ㎡ in clump of piles injection process and be no more than 30, pile sinking speeds control is at 1m/min;

Every 10000 ㎡ adopt the even soil taking hole forming of screw rod rig 40, aperture of fetching earth is 500mm, and fetch earth degree of depth 10m < h < 15m;

The observation stake of 10% quantity is set, determines to observe the frequency according to observation stake periphery piling situation, draw a top mark High variation curve, for follow-up soil taking hole forming quantity and depth of pore forming provide reference frame.

Said method runs into clump of piles On The Floating, the technical measures taked according in on-the-spot piling construction process, and corresponding data is through repeatedly field trial and sums up the optimal data drawn.

The present invention makes floating stake phenomenon obtain effective containment, make integral tube pile driving construction quality through static load, dynamic survey detects and after soil excavation, the check of stake position all can reach design and code requirement, effectively ensure that pile foundation engineering construction quality, decrease the fund input of the floating stake phenomenon of process, it also avoid because processing floating stake phenomenon holding time to the adverse effect of engineering construction duration, Foundation Design and upper part work construction after making pile foundation construction, can be carried out in time.

Claims

1. the pile-sinking method controlling a clump of piles and float, it is characterized in that, it comprises: the sequence of construction taking the stake of first injection patten, the stake of injection equipment Foundations again, last injection terrace stake, take from the inside to the outside during the stake of injection large-area terrace, by near to far away, beat every applying, the mode of symmetrical injection, make soil layer evenly compacted as far as possible; Control injection stake every day number within the scope of every 1000 ㎡ in clump of piles injection process and be no more than 30, pile sinking speeds control is at 1m/min; Every 10000 ㎡ adopt the even soil taking hole forming of screw rod rig 40, aperture of fetching earth is 500mm, and fetch earth degree of depth 10m < h < 15m; The observation stake of 10% quantity is set, determines to observe the frequency according to observation stake periphery piling situation, draw a top mark High variation curve, for follow-up soil taking hole forming quantity and depth of pore forming provide reference frame.