CN102071679B - Method for consolidating existing building foundation - Google Patents

Method for consolidating existing building foundation Download PDF

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Publication number
CN102071679B
CN102071679B CN2010106112021A CN201010611202A CN102071679B CN 102071679 B CN102071679 B CN 102071679B CN 2010106112021 A CN2010106112021 A CN 2010106112021A CN 201010611202 A CN201010611202 A CN 201010611202A CN 102071679 B CN102071679 B CN 102071679B
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China
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existing building
stake
concrete
foundation
pile
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CN102071679A (en
Inventor
胡长明
蒋明
王静
王丽芳
车佳玲
林�源
朱艳
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention belongs to the field of consolidating existing building foundation, in particular relates to a method for consolidating the existing building foundation of which the upper structure cannot provide large counter-force. In the method, riprap concrete is adopted as a main material of a pile; holes are dug manually; and block stones or cobbles with the diameter of between 2 and 20cm are thrown into the dug holes in a mechanical or manual mode, and the poured concrete can be compactly filled in gaps generated in a block stone settling path at any time so as to form a compact riprap concrete pile with higher strength. Therefore, the pile end can be placed in a better bearing stratum on the deep part of the foundation, and complete or partial load of a building is transferred to the stratum to fulfill the aims of reducing additional stress of foundation soil under the substrate, reducing settlement and consolidating.

Description

A kind of existing building foundation reinforcement method
Technical field
The invention belongs to existing building ground stabilization field, be specially a kind of method of the existing building ground being reinforced with manually digging hole jackstone concrete pile.
Background technology
In existing structure foundation stabilization works, the method that often adopts has basic reinforcing method, increasing foundation ' s bottom area method, intensification lex fundamentalis, anchor rod pressing pile technique, jet grounting, lime-soil compaction pile method, root pile method, hole formula static pressed pile method, lime pile method etc.It is that loess, ground are the reinforcing of the less existing construction foundation of strip foundation or independent foundation under column and the number of plies or are difficult for construction or on design theory, do not meet the characteristics on existing building structure and basis or have the high shortcoming of cost that above-mentioned each method can not provide big counter-force and foundation soil to superstructure.
Summary of the invention
Shortcoming or deficiency to prior art; The objective of the invention is to; A kind of existing construction foundation reinforcement means is provided, and being particularly useful for superstructure, big counter-force and foundation soil can not be provided is that loess, ground are the reinforcing of the less existing construction foundation of strip foundation or independent foundation under column and the number of plies.
In order to realize above-mentioned technical assignment, the present invention adopts following technical scheme:
1, a kind of existing building foundation reinforcement method is characterized in that, said method comprises the steps:
Step 1 is confirmed construction parameter: radical, size and the position of confirming to reinforce required stake;
Step 2, excavation stake hole: the excavation construction groove, and according to a determined construction parameter manually digging hole formation stake hole;
Step 3, the cast pile body: the limit is thrown into the stone limit and pours concrete in the stake hole of digging, and at stake end 1.5-2m place the pile body enlarged cross section, it expands bottom diameter and pile body diameter than D/d≤3.0, the slope a/h of expansion side, bottom 1Be 1/3-1/2, expand slope, side, bottom rise h 2Be 0.10D-0.15D; 1.5 ~ 3m place begins to build with expansive concrete at the bottom of apart from the building foundation;
Step 4 is laid mattress layer: between stake top and existing building basis, lay the thick mattress layer of 300 ~ 500mm;
Step 5, backfilling compaction construction groove.
Stone described in the step 3 is that particle diameter is piece stone or the cobble of 2 ~ 20 cm.
Described in the step 3 in the expansive concrete used expansion agent be land plaster, calcium sulphoaluminate class expansion agent, calcium sulphoaluminate calcium oxide expansion agents or calcium oxide expansion agents, wherein the volume of land plaster is 5%, the volume of calcium sulphoaluminate class expansion agent is 5% ~ 7%, the volume of calcium sulphoaluminate calcium oxide expansion agents is 5% ~ 7%, the volume of calcium oxide expansion agents is 5% ~ 7%.
Particle diameter≤the 30mm of mattress layer described in the step 4.
Existing construction foundation reinforcement means provided by the present invention; Be applicable to that foundation soil is that loess and superstructure can not provide than counter-force, the ground that needs reinforcement are the less building of the number of plies of independent foundation under column or strip foundation greatly; Material of body of a pile in the method is selected the stone and the concrete of suitable size for use; Both satisfy the mechanics demand of ruggedized construction, reduced the use amount of cement in the work progress again largely, reduced the dust pollution in the work progress.And the expansive concrete of cast suitable thickness between pile body top and basis; Utilize the characteristics that himself expand to push the soil layer on every side and the mattress layer on top; Make fully to be connected between pile body and the existing building basis, guarantee ruggedized construction effective support upper building.This method not only have gather materials on the spot, cement consumption is few, the aquation temperature rise is low, volume stability good, also has advantages such as energy-saving and environmental protection simultaneously, be a kind of of existing foundation reinforcement method replenished.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is that jackstone concrete pile of the present invention is connected the construction sketch map with the basis, among the figure: 1, existing building; 2, existing building basis; 3, mattress layer; 4, expansive concrete pile body; 5, brick wall; 6, construction groove; 7, jackstone concrete pile body;
Fig. 3 is an expanded bore pile end construction sketch map of the present invention, among the figure: D, expansion bottom diameter; D, pile body diameter; A, expansion side, bottom horizontal length; h 1, expand the vertical length in bottom; h 2, expand slope, side, bottom rise.
Below in conjunction with accompanying drawing the present invention is done further explain.
The specific embodiment
Like Fig. 1, Fig. 2 and shown in Figure 3, existing building foundation reinforcement method provided by the present invention is characterized in that, said method specifically may further comprise the steps:
Step 1; Confirm construction parameter: design drawing and surrounding environment to the existing building thing are carried out deep investigation and understanding; And the form and the size on the basis of existing building thing checked, confirm to reinforce radical, size and the position etc. of required pile body then based on its basic form and stressed characteristics;
Step 2, excavation stake hole: based on radical, size and the position of determined stake, the wide construction groove of the excavation 1 ~ 2m of place on the existing building basis; So that certain operating space is arranged in work progress; And manually digging hole forms the stake hole, check soil property, foreign material at the bottom of the peace and quiet hole;
Step 3, the cast pile body:
The limit is that the piece stone of 2 ~ 20 cm or the mode of cobble use machinery or manual work are thrown in the hole of having dug with particle diameter; Concrete is poured on the limit into; Want the concrete compactness of strict control; Guarantee to fill closely knitly, can adopt manual work to vibrate in the process or machinery vibrates and makes concrete fill the vacancy that causes in the stone sedimentation path closely knit at any time.Concrete the building of stone should be carried out continuously; If special circumstances must be interrupted and be built at interval that the period must not surpass the concrete initial setting time; And stone should be thrown into continuously; But this operation is accomplished before also must arriving in the initial setting time, and the amount of concrete mortar should be enough to wrap up stone fully, makes it to produce the jackstone concrete of homogeneous.The riprap concrete curing time is 30 ~ 40 days.
Pile body is wanted enlarged cross section at stake end 1.5 ~ 2m place, expands bottom diameter (D) and pile body diameter (d) than D/d, according to requirement for bearing capacity and expand the side, bottom and confirm that with bearing course at pile end soil nature maximum is no more than 3.0 (>=3.0), the slope a/h of expansion side, bottom 1(a is for expanding side, bottom horizontal length; h 1For expanding the vertical length in bottom) confirm a/h according to actual pore-forming and supporting condition 1Generally get 1/3-1/2, it is about 1/3 that sand is got, and it is about 1/2 that silt, cohesive soil are got, and expands the bottom surface, bottom and generally be the bottom of a pan shape, expands slope, side, bottom rise h 2Get 0.10D-0.15D.
Generally should select than hardpan as bearing course at pile end.In particular cases, hold full section to get into the degree of depth >=2d of bearing stratum for cohesive soil, silt stake, during sand >=1.5d, stake holds full section to get into the degree of depth >=1d of bearing stratum during rubble class soil.When having weak substratum, hard bearing stratum thickness should not be less than 4d below the pile foundation.When hard bearing stratum during the permission of thicker and execution conditions, the degree of depth that the full section of stake end gets into bearing stratum should reach the critical depth of end resistance.
1.5 ~ 3m place at the bottom of apart from the building foundation; Pile body is built with expansive concrete; Used expansion agent can be selected land plaster, calcium sulphoaluminate class expansion agent, calcium sulphoaluminate calcium oxide expansion agents or calcium oxide expansion agents for use, and wherein the volume of land plaster is 5%, the volume of calcium sulphoaluminate class expansion agent is 5% ~ 7%, the volume of calcium sulphoaluminate calcium oxide expansion agents is 5% ~ 7%, the volume of calcium oxide expansion agents is 5% ~ 7%.
Step 4; Lay mattress layer: between stake top and existing building basis, lay the thick mattress layer of 300 ~ 500mm; The mattress bed thickness should be got high value, material selection medium sand, coarse sand, graded sand and stone or the rubble of mattress layer, maximum particle diameter≤30mm when big or pile spacing was big when stake footpath.
Step 5, backfill compacting: behind the pile, the construction groove is with 2:8 or 3:7 dirt compaction in layers backfill, coefficient of consolidation >=0.95.
The present invention below is provided two concrete embodiment:
Instance 1:
The existing building of required reinforcing is one deck Large Space at Lower Part building in the present embodiment, independent foundation under column, and embedded depth of foundation 1.80m, thus because setting of ground causes whole building to sink.
Step 1, through confirming after on-the-spot investigation, evaluation, the analysis that its construction parameter is following: adopting 24 pile bodies, is 2 piles under each basis, and each basis spacing of 2 piles down is 1400mm, and the stake hole is d=600mm, and stake is long to be 11m;
Step 2, according to the construction parameter of confirming in the step 1, the wide construction groove of the excavation 1 ~ 2m of place on the existing building basis, and manually digging hole forms the stake hole, check soil property, foreign material at the bottom of the peace and quiet hole;
Step 3, the used stone of pile body are the piece stone of 2 ~ 20 cm, and concrete strength is C20, and pile body enlarges the bottom at stake end 2m place, and its dependency structure parameter is D/d=2, a/h 1=1/2, h 2=0.10D, i.e. D=1200mm, h 2=120mm adopts machinery to vibrate and makes concrete at any time that the vacancy filling that causes in the stone sedimentation path is closely knit in the process, the amount of concrete mortar should be enough to wrap up stone fully, makes it to produce the jackstone concrete of homogeneous.The riprap concrete curing time is 35 days.Apart from the building foundation 2.5m place pile body build with expansive concrete, used expansion agent is a land plaster, wherein the volume of land plaster is 5%;
Step 4 is laid the thick mattress layer of 300mm between stake top and existing building basis, the mattress layer material is the coarse sand of particle diameter less than 30mm;
Step 5, backfill compacting: behind the pile, the construction groove is with 2:8 or 3:7 dirt compaction in layers backfill, coefficient of consolidation >=0.95.
Instance 2:
Among this embodiment, required reinforcing building is for being individual layer bent structure, independent foundation under column, embedded depth of foundation 2.10 m.Use the back to find that there is the crack on body of wall and ground in building, and expansion trend is arranged, structure is worked the mischief, need take effective reinforcement measure for avoiding this facility floor and wall body slit to continue development.
Step 1, through confirming after on-the-spot investigation, evaluation, the analysis that its construction parameter is following: adopting 50 pile bodies, is 2 piles under each basis, and each basis spacing of 2 piles down is 1000mm, and the stake hole is d=800mm, and stake is long to be 13m.
Step 2, excavation construction groove and manually digging hole form the stake hole;
Step 3, it is the cobble of 2 ~ 20 cm that pile body uses particle diameter, and the pile body concrete strength is C20, and pile body enlarges bottom D/d=2.5, a/h at stake end 2m place 1=1/2, h 2=0.10D, i.e. D=2000mm, h 2=200mm adopts machinery to vibrate and makes concrete at any time that the vacancy filling that causes in the stone sedimentation path is closely knit in the process, the amount of concrete mortar should be enough to wrap up fully stone.The riprap concrete curing time is 40 days.Apart from the building foundation 3m place pile body build with expansive concrete, used expansion agent is a calcium sulphoaluminate class expansion agent, its volume is 7%.
Step 4 is laid the thick mattress layer of 350mm between stake top and existing building basis, the mattress layer material is the coarse sand of particle diameter less than 30mm.
Step 5, backfill compacting: behind the pile, the construction groove is with 2:8 or 3:7 dirt compaction in layers backfill, coefficient of consolidation >=0.95.

Claims (3)

1. an existing building foundation reinforcement method is characterized in that, said method comprises the steps:
Step 1 is confirmed construction parameter: radical, size and the position of confirming to reinforce required stake;
Step 2, excavation stake hole: the excavation construction groove, and according to a determined construction parameter manually digging hole formation stake hole;
Step 3; The cast pile body: the limit is thrown into piece stone or the cobble limit that particle diameter is 2～20cm and pours concrete in the stake hole of digging; And pile body begins enlarged cross section at distance stake end 1.5-2m place; It expands bottom diameter and pile body diameter than D/d≤3.0, and the slope a/h1 that expands the side, bottom is 1/3-1/2, and wherein: a is for expanding side, bottom horizontal length; h 1For expanding the vertical length in bottom, expanding slope, side, bottom rise h2 is 0.10D-0.15D; The 1.5-3m place begins to build with expansive concrete at the bottom of apart from the building foundation;
Step 4 is laid mattress layer: between stake top and existing building basis, lay the thick mattress layer of 300-500mm;
Step 5, backfilling compaction construction groove.
2. existing building foundation reinforcement method according to claim 1; It is characterized in that; Described in the step 3 in the expansive concrete used expansion agent be land plaster, calcium sulphoaluminate class expansion agent or calcium oxide expansion agents, wherein the volume of land plaster is 5%, the volume of calcium sulphoaluminate class expansion agent is 5%～7%, the volume of calcium oxide expansion agents is 5%～7%.
3. existing building foundation reinforcement method according to claim 1 is characterized in that, the particle diameter≤30mm of mattress layer described in the step 4.
CN2010106112021A 2010-12-29 2010-12-29 Method for consolidating existing building foundation Expired - Fee Related CN102071679B (en)

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CN103422489A (en) * 2012-05-15 2013-12-04 张家口市冀诚工程技术有限公司 Pile-end tube composite foundation and construction method thereof
CN104420486B (en) * 2013-08-21 2017-03-01 贵阳铝镁设计研究院有限公司 A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile
CN103660034B (en) * 2013-12-13 2015-09-23 中联重科股份有限公司 Tubular pile concrete mixing plant, control method, control device and control system
CN104074184B (en) * 2014-05-07 2017-01-25 孔超 Pile base post-grouted expanded-base bored pile
CN105404719B (en) * 2015-10-29 2018-10-23 交通运输部公路科学研究所 A kind of existing foundation pile axial bearing capacity analysis method
CN108411889B (en) * 2018-03-07 2021-02-05 清华大学 Structured cemented gravel pile and construction method thereof
CN111719547B (en) * 2019-03-21 2021-09-17 深圳墨泰建筑设计与咨询有限公司 Layered secondary CFG pile construction method
CN110306586A (en) * 2019-07-10 2019-10-08 上海建为历保科技股份有限公司 A kind of foundation reinforcement method for traditional architecture
CN114033213A (en) * 2021-12-15 2022-02-11 山西五建集团有限公司 Method for reinforcing urn-city deformed wall

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CN100371537C (en) * 2006-01-05 2008-02-27 江苏南水土建工程公司 Novel method for reinforcing deep soft foundition-cencrete core sand stone pile compound foundition method
CN100455731C (en) * 2006-07-28 2009-01-28 谭新平 Guide pit type manual pot holing pile reinforing and underpinning method for building foundation and composite supporting pile
JP2009167752A (en) * 2008-01-18 2009-07-30 Nippon Steel Corp Steel pipe for ground reinforcement and method of ground reinforcement using it

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