WO2017185817A1 - Procédé de construction pour mélanger sur place un pieu de stabilisation des sols par le ciment en surface - Google Patents

Procédé de construction pour mélanger sur place un pieu de stabilisation des sols par le ciment en surface Download PDF

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Publication number
WO2017185817A1
WO2017185817A1 PCT/CN2017/000297 CN2017000297W WO2017185817A1 WO 2017185817 A1 WO2017185817 A1 WO 2017185817A1 CN 2017000297 W CN2017000297 W CN 2017000297W WO 2017185817 A1 WO2017185817 A1 WO 2017185817A1
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WIPO (PCT)
Prior art keywords
pile
soil
cement
construction method
inner tube
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Ceased
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PCT/CN2017/000297
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English (en)
Chinese (zh)
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王继忠
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Publication of WO2017185817A1 publication Critical patent/WO2017185817A1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods

Definitions

  • the invention relates to a construction method of cement soil piles, in particular to a construction method of cement soil piles which are stirred on the ground at a construction site.
  • Cement-soil mixing pile is a method for reinforcing the low foundation of saturated soft clay. It uses cement as a curing agent. By stirring the machine, the soft soil and the curing agent are forcibly stirred in the depth of the foundation, and between the curing agent and the soft soil. The resulting series of physicochemical reactions harden the soft soil into a high quality foundation with integrity, water stability and strength.
  • the usual construction methods for cement-soil mixing piles include powder spray method, high-pressure rotary spray method and deep mixing method.
  • Powder spraying method refers to the use of a pile-driving machine to evenly mix the dry powder-like cement and other hardener into the soil in the deep layer of the foundation to harden the soil to form the pile body;
  • the high-pressure jet-jet pile is a cement with a high-pressure rotating nozzle.
  • the slurry is sprayed into the deep soil and mixed with the soil to form a continuous lap joint of cement and solid;
  • the deep mixing method is often used to reinforce the saturated soft clay foundation. It is a main agent using cement, lime and other materials as a curing agent, and is stirred by a mechanical machine. In the deep soil, the original soil and the curing agent are forcibly stirred to harden the soil to form the pile body.
  • the deep mixing method and the powder spraying method have higher requirements on soil quality, and it is easy to affect the bearing capacity due to the uneven strength of the pile due to uneven mixing.
  • the high-pressure rotary jet process is strictly controlled and easy to control.
  • causesd by slurry waste and environmental pollution, and the common problem of these three methods is that due to the change of hardness and depth of the soil layer in the foundation, the diameter and strength of the pile are easily changed, and at the same time, the geological environment with more water content In the middle, the uniformity of stirring or solidification of the deep soil is not guaranteed by the action and influence of water, and thus the strength of the formed composite foundation is greatly affected.
  • the invention designs a method for constructing an on-site ground-mixed cement soil pile, the steps comprising the steps of: taking out the soil in the foundation at the pile position to form a pile hole; and in step two, placing the removed soil into the ground mixing container Inside, the solidifying agent and water are added to uniformly stir the soil to form cement soil; in step 3, the agitated cement soil is injected into the original pile hole to form a pile.
  • the method for taking out the soil in the foundation at the pile position in the first step includes one of the following methods: 1 taking out the soil at the pile position by one of auger, rotary drilling, earthmoving device or combination; One or a combination of auger, rotary drilling, and earthmoving device removes the soil at the pile position and sinks into the steel casing in the pile hole; 3 sinks into the steel casing at the pile position and passes through the auger One or a combination of a rotary drilling and earthmoving device removes the soil in the steel casing; 4 after sinking into the inner and outer tubes that are nested together at the pile position, through an auger, a rotary drill, One or a combination of the earthmoving device removes the soil within the inner tube.
  • the hydraulic soil after stirring in the second step has a large fluidity, and the slump is 80 to 200 mm.
  • the material of the curing agent added in the second step includes cement, or sand, fly ash and concrete are added to the cement.
  • the agitated cement soil is directly injected or pumped into the pile hole or the steel casing or the inner tube.
  • the carrier is constructed at the bottom of the pile, and the method for constructing the carrier includes: 1 placing a heavy hammer in the pile hole or the steel casing or the inner tube, and using the impact kinetic energy of the weight to slam the soil at the bottom of the pile;
  • the pile hole or the steel casing or the inner tube is filled with the reinforcing material, and the reinforcing material includes one or several kinds of dry hard concrete, brick, gravel, cement mortar, and the weight is placed in the pile hole or the steel casing or the inner tube. Use the impact kinetic energy of the weight to slam the filled reinforcement.
  • step three the steel cage is lowered into the pile hole or the steel casing or the inner tube to form a reinforced concrete pile.
  • the hole forming device can be formed into the small diameter hole in the cement soil pile body, and then the steel cage is placed in the pile hole and the concrete is poured or inserted into the precast concrete pile body. Forming a composite pile containing reinforced concrete piles in the cement soil pile.
  • the pile position in the first step is set according to the spacing between the soil-receiving pile and the compacted pile.
  • the soil-pile pile is used to take out the soil in the foundation of the pile position, and the compacted pile is to squeeze the soil in the foundation of the pile to the pile.
  • the agitated cement soil is separately injected or pumped into the original pile hole of the soil pile and the compact pile.
  • the inner tube is first proposed and the vibration force is applied to the inner tube to prevent the cement soil from being taken out of the pile when the inner tube is raised.
  • a backing plate is pressed in the inner tube or the outer tube. The cement soil in the pipe is pressed against the pad by a heavy hammer above the pad to apply a certain pressure to the cement soil in the pipe to prevent the cement soil from being taken out of the pile during the pipe pulling process.
  • the technology of the present invention has a wide application range, and is particularly suitable for cement soil pile foundation construction in a large area with a large water content. Due to the ground mixing method, the uniformity and strength of the reinforced soil after stirring are greatly improved compared with the stirring method in the deep soil. Moreover, the soil removed and the curing agent can be mixed and all backfilled into the soil of the pile foundation without causing waste and pollution of the soil. It has the advantages of low construction cost and good construction quality. Moreover, a carrier can be added at the bottom end of the cement soil pile to improve the bearing capacity of the single pile, and a reinforced concrete pile can be added to the cement soil pile body to improve the compression resistance and shear resistance of the pile body, and at the same time reduce the usage of the building materials such as concrete. ,save costs.
  • the distribution within the depth of the soil layer in a construction site is 1 recent artificial fill layer.
  • 3 silty clay layer containing peat, developed black carbide, rust ribbon, partially sandwiched with yellow soil, layer thickness 2.10-4.30 meters, average thickness 3.34 m
  • fak 501Pa
  • the average natural water content is 62.5%
  • 4 silty clay layer containing peat, sporadic shell fragments, developed with black carbide, embroidered yellow strips, layered universal, maximum exposed thickness of 9.20 meters
  • fak 80 kPa
  • the average natural water content is 45.2%.
  • the foundation depth of the proposed project is 3.5 meters.
  • the foundation form is the valve plate foundation.
  • the base contact pressure is 60 kPa.
  • the foundation bottom is located in the second layer foundation soil and is partially located in the first layer foundation soil.
  • the composition of the first layer of mixed soil is complex and the physical and mechanical properties are poor. It is intended to be completely removed.
  • the bearing capacity of the second layer of foundation soil is 110 kPa.
  • the bearing capacity satisfies the upper load requirement, but the bearing capacity of the lower layer is 50 kPa, which is a soft soil layer. Therefore, the underlying layer needs to be grounded.
  • the project is designed as a cement-soil pile with a diameter of 0.5 m and an effective pile length of 17 m.
  • the length of the pile top protection is 0.3 m
  • the pile spacing is 1.5 m
  • the bearing capacity of the single pile is 210 kN
  • the curing agent is 42.5 ordinary silicate water. Mud and cement are not less than 18%.
  • the number of design piles is 592.
  • step 1 the 592 piles are positioned according to the design requirements, and the steel casing is sunk at the pile position to the design depth, and the soil in the steel casing is taken out by the earth borrower according to the flow operation method;
  • the soil to be taken out is poured into a stirring container on the ground, and a curing agent and water are added to the stirring container.
  • the cement content in the curing agent is 35% by weight of the soil, and 8% by weight of sand and 8% by weight of the soil are added.
  • the fly ash is then concentrated and uniformly stirred by a stirrer.
  • the water content of the cemented soil after mixing is 10%-15%, and the slump is 10 cm.
  • step 3 the stirred cement soil is pumped into the steel casing. Put the steel casing into a pile.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un procédé de construction pour mélanger sur place un pieu de stabilisation des sols par le ciment en surface, le procédé comprenant les étapes suivantes : étape un, extraire un corps de sol du sol à la position d'une fondation de pieu de façon à former un trou de pieu ; étape deux, placer le corps de sol extrait dans un récipient de mélange en surface, et ajouter un agent de durcissement et de l'eau au sol à mélanger de manière uniforme, de façon à former un sol de ciment ; étape trois, verser le sol de ciment mélangé dans le trou de pieu original, de façon à former un pieu.
PCT/CN2017/000297 2016-04-27 2017-04-11 Procédé de construction pour mélanger sur place un pieu de stabilisation des sols par le ciment en surface Ceased WO2017185817A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610269332.9 2016-04-27
CN201610269332.9A CN105887837B (zh) 2016-04-27 2016-04-27 一种现场地面搅拌水泥土桩的施工方法

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WO2017185817A1 true WO2017185817A1 (fr) 2017-11-02

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CN (1) CN105887837B (fr)
WO (1) WO2017185817A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110865172A (zh) * 2019-10-23 2020-03-06 长沙理工大学 一种确定软塑改性土地基应急施工参数的土工试验方法
CN112030940A (zh) * 2020-06-23 2020-12-04 武汉谦诚桩工科技股份有限公司 一种海相软土固化剂及原位预拌水泥土灌注桩施工工艺
CN112624670A (zh) * 2020-10-19 2021-04-09 中国建筑一局(集团)有限公司 一种建筑固废混合水泥土
CN113186895A (zh) * 2021-03-19 2021-07-30 北京高能时代环境技术股份有限公司 大深度污泥塘原位多维固化施工方法
CN113235584A (zh) * 2020-12-30 2021-08-10 广西建工集团第五建筑工程有限责任公司 用于高层建筑的复合桩基础施工方法
CN113309087A (zh) * 2021-06-16 2021-08-27 汉江生态水利(武汉)有限公司 动态调整喷浆、提升和下沉速度的搅拌桩施工装置及方法
CN115639047A (zh) * 2022-10-28 2023-01-24 上海市建筑科学研究院有限公司 一种加固土抗压强度试验方法
CN115659449A (zh) * 2022-09-08 2023-01-31 中交一公局第七工程有限公司 基于轻质水泥土桩复合地基的计算方法、系统及应用
CN118498337A (zh) * 2024-07-16 2024-08-16 辽宁城建集团有限公司 一种淤泥地质的地基施工方法
CN119640774A (zh) * 2024-12-18 2025-03-18 山东鼎信岩土科技有限公司 一种全置换变截面水泥土桩的制备方法

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CN105887837B (zh) * 2016-04-27 2018-11-23 王继忠 一种现场地面搅拌水泥土桩的施工方法
CN106759286A (zh) * 2017-01-13 2017-05-31 王继忠 一种桩基或帷幕墙的施工方法
CN106812149A (zh) * 2017-03-03 2017-06-09 王继忠 一种桩基的施工方法
CN106759427B (zh) * 2017-03-14 2019-07-12 中电建建筑集团有限公司 泥沼地区高耸构筑物复合基桩施工方法
CN108532590A (zh) * 2018-03-02 2018-09-14 毕建宏 挖孔桩的施工方法和用具
CN108708372B (zh) * 2018-06-01 2019-07-16 内蒙古自治区水利水电勘测设计院 一种有压复合水泥风积砂浆搅拌桩成桩工艺
CN111827276A (zh) * 2020-07-23 2020-10-27 东莞市华科建筑科技有限公司 一种水泥土搅拌桩制作工艺
CN111980016A (zh) * 2020-08-20 2020-11-24 盐城工学院 一种劲性水泥土支护桩及其施工方法
CN113322980A (zh) * 2021-03-04 2021-08-31 河海大学 一种基于自密水泥土的工程边坡滑坡灾害防护方法
WO2023159712A1 (fr) * 2022-02-24 2023-08-31 广东盛瑞科技股份有限公司 Procédé de construction de route sur place utilisant le sol sur place
CN116005654A (zh) * 2022-12-08 2023-04-25 广东盛瑞科技股份有限公司 一种采用泡沫聚合土灌注成桩的加固土桩及其建成方法

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CN104404958A (zh) * 2014-11-20 2015-03-11 上海智岛建筑科技有限公司 一种扩底预制空心桩的施工方法
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US5967700A (en) * 1995-12-04 1999-10-19 Gunther; Johan M. Lime/cement columnar stabilization of soils
JP2001248147A (ja) * 2000-03-07 2001-09-14 Fumio Kosaka ソイルセメント合成杭用掘削撹拌翼
CN101818493A (zh) * 2010-03-23 2010-09-01 南通宏华建筑安装有限公司 复合地基的施工方法
CN101899828A (zh) * 2010-04-27 2010-12-01 河海大学 袋装夯实小直径水泥土桩复合地基施工方法
CN103590391A (zh) * 2013-11-27 2014-02-19 温州宏源水电建设有限公司 一种水泥粉煤灰碎石桩地基加固施工方法
CN105887837A (zh) * 2016-04-27 2016-08-24 王继忠 一种现场地面搅拌水泥土桩的施工方法

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110865172A (zh) * 2019-10-23 2020-03-06 长沙理工大学 一种确定软塑改性土地基应急施工参数的土工试验方法
CN112030940A (zh) * 2020-06-23 2020-12-04 武汉谦诚桩工科技股份有限公司 一种海相软土固化剂及原位预拌水泥土灌注桩施工工艺
CN112624670A (zh) * 2020-10-19 2021-04-09 中国建筑一局(集团)有限公司 一种建筑固废混合水泥土
CN113235584A (zh) * 2020-12-30 2021-08-10 广西建工集团第五建筑工程有限责任公司 用于高层建筑的复合桩基础施工方法
CN113186895A (zh) * 2021-03-19 2021-07-30 北京高能时代环境技术股份有限公司 大深度污泥塘原位多维固化施工方法
CN113309087A (zh) * 2021-06-16 2021-08-27 汉江生态水利(武汉)有限公司 动态调整喷浆、提升和下沉速度的搅拌桩施工装置及方法
CN115659449A (zh) * 2022-09-08 2023-01-31 中交一公局第七工程有限公司 基于轻质水泥土桩复合地基的计算方法、系统及应用
CN115659449B (zh) * 2022-09-08 2024-01-16 中交一公局第七工程有限公司 基于轻质水泥土桩复合地基的计算方法、系统及应用
CN115639047A (zh) * 2022-10-28 2023-01-24 上海市建筑科学研究院有限公司 一种加固土抗压强度试验方法
CN118498337A (zh) * 2024-07-16 2024-08-16 辽宁城建集团有限公司 一种淤泥地质的地基施工方法
CN119640774A (zh) * 2024-12-18 2025-03-18 山东鼎信岩土科技有限公司 一种全置换变截面水泥土桩的制备方法

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