CN108999178A - A kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation - Google Patents

A kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation Download PDF

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Publication number
CN108999178A
CN108999178A CN201810886054.0A CN201810886054A CN108999178A CN 108999178 A CN108999178 A CN 108999178A CN 201810886054 A CN201810886054 A CN 201810886054A CN 108999178 A CN108999178 A CN 108999178A
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China
Prior art keywords
soil
foundation
tubular pile
soft
hardening
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Pending
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CN201810886054.0A
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Chinese (zh)
Inventor
牛富生
朱汉华
陈孟冲
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Ningbo Communications Planning Institute Co Ltd
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Ningbo Communications Planning Institute Co Ltd
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Priority to CN201810886054.0A priority Critical patent/CN108999178A/en
Publication of CN108999178A publication Critical patent/CN108999178A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E02D3/103Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • E01C3/04Foundations produced by soil stabilisation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E02D3/106Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates

Abstract

The invention discloses a kind of Soft Soil Subgrade Treatment Methods of soil body hardening form compound foundation, belong to Soft Ground field.The present invention is boxed out tubular pole using hollowcore precast, and when tubular pole is squeezed into, the part hole water in stake week is flowed into hollow shell pill, can both be reduced part soil compaction effect, also be can reduce excess pore water pressure;It boxes out in tubular pole in hollowcore precast using high-pressure rotary-spray jet; high pressure gas by hollowcore precast tubular pole box out sideways diffusion to surrounding soil formed horizontal channel accelerate discharging consolidation; then it draws water, solves the problems, such as that soil particle can enter the preset drainage path of prefabricated tubular pile transverse direction hole blocking in the actual drainage procedure in scene;Then the cal rolling soil body is used, accelerates pile peripheral earth draining, then draws water again, eventually form composite foundation, meet soft soil roadbed quick processing, quickly apply to build the characteristics of being open to traffic, improving carrying, control post-construction settlement of subgrade.

Description

A kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation
Technical field
The present invention relates to Soft Ground fields, and in particular to a kind of soil body hardening form compound foundation it is soft soil roadbed Processing structure and its method.
Background technique
Preloading or vacuum preloading draining concretion method are a kind of relatively inexpensive soft-soil foundation treatment methods, but have larger limitation Property.Be mainly manifested in: (1) prior art is a kind of technology handled from earth's surface to underground deep layer, and economic treatment depth is generally not More than 10m;(2) the processing time is longer;(3) the subsequent soil body still long-term creep, foundation bearing capacity is limited, and settlement after construction is larger.
There is soil compaction effects when prefabricated tubular pile squeezes into the soil body it is obvious, excess pore water pressure value is larger the problems such as.Thus Many scholars have developed a series of new drainage tubular pile, such as: the one of the small celebrating research and development of Xu in the patent No. 201020649772.5 Kind drainage tubular pile;Tang Xiao force etc. has developed a kind of prefabricated pipe that can be drained and increase frictional resistance in the patent No. 201510150002.3 Stake.Such novel tubular pile is all to provide drainage path by reserving lateral hole in pile body side wall, is drawn water then up, however Soil particle can enter the preset drainage path of drainage channel blocking in actual drainage procedure at the scene, and drainage effect is accelerated to have Limit, the effect is unsatisfactory for practical ground.
A kind of Wu Hui processing method of soil body hardening such as bright, this method are set by gas injection in the patent No. 201510584221.2 , to soil body gas injection, pass through pumping equipment for through conduit after the completion of gas injection and carry out operation of drawing water, which is single improve Soil body engineering mechanics character, without form compound foundation, treated, and foundation bearing capacity is limited.
Wu Hui is bright etc. in the patent No. 201510301241.4 has developed a kind of different depth disturbance and combines the soft of discharging consolidation Native method for processing foundation;Wu Hui is bright in the patent No. 201711363451.1 has developed a kind of pressurization of chpn in length and breadth draining foundation Processing method;Above two invention is all to combine preloading loading, and discharging consolidation accelerates, but treated that foundation bearing capacity is limited.
In view of problem above, it would be highly desirable to develop one kind and slow down soil compaction effect, accelerate excess pore pressure dissipation, soil body hardening The soft soil roadbed immediate processing method of form compound foundation afterwards.
Summary of the invention
The present invention exists for preloading in soft-soil foundation treatment method or vacuum preloading draining concretion method and prefabricated tubular pile The problem of, and a kind of soft subgrade treatment structure of soil body hardening form compound foundation is provided.
In prior art basis, the present invention combines soft soil roadbed feature, no longer using traditional preloading or Vacuum preloading draining concretion method, the tubular pole but use hollowcore precast is boxed out, when tubular pole is squeezed into, the part hole water in stake week is flowed into In hollow shell pill, part soil compaction effect can be both reduced, also can reduce excess pore water pressure;It boxes out in tubular pole in hollowcore precast Using high-pressure rotary-spray jet, like marine heating power whirlpool stormy waves, high pressure gas boxes out sideways diffusion extremely by hollowcore precast tubular pole Surrounding soil forms horizontal channel and accelerates discharging consolidation, then draws water, and solves soil particle meeting in the actual drainage procedure in scene The problem of blocking preset drainage path into prefabricated tubular pile transverse direction hole;Then the cal rolling soil body is used, soil around pile is accelerated Body draining, then draws water again, eventually forms composite foundation, meet soft soil roadbed quick processing, quickly apply to build and be open to traffic, raising is held The characteristics of carrying, controlling post-construction settlement of subgrade.
Specific technical solution of the present invention is as follows:
A kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation, its step are as follows:
1) smooth soft soil foundation place to be processed;
2) into soft soil foundation, injection offers the hollowcore precast tubular pole of preformed hole, makes the part pore water in sludge soft Into prefabricated tubular pile inner cavity;
3) air jet pipe is applied, so that the bottom gas outlet of air jet pipe is entered bottom in prefabricated tubular pile, then connected and sprayed with conduit The top air inlet of pipe and the gas outlet of jet-generating system, by air jet pipe, edge injection side is promoted slowly from the bottom up, makes high pressure Gas diffuses to surrounding soil by the preformed hole horizontal direction of prefabricated tubular pile, circumferentially forms several in prefabricated tubular pile and is laterally extended Gas passage gap, the pore water in surrounding soil entered in prefabricated tubular pile by gas passage gap, accelerates discharging consolidation;
4) after the jet drainage procedure for completing step 3) to prefabricated tubular pile, drainpipe is transferred in prefabricated tubular pile, using water Pump extracts the water in tubular pole out;
5) soft soil foundation around the prefabricated tubular pile of step 4) is completed using cal rolling, makes to roll within the scope of influence depth The soil body more consolidation, wherein residual gap water is pressed into prefabricated tubular pile, and roll the soil body outside influence depth range continuation It is drained by gas passage gap;After rolling, the water in tubular pole is extracted out using water pump again, hardens the soil body;
6)) after soil body hardening, pile cover is arranged in prefabricated tubular pile and pile peripheral earth form compound foundation at the top of prefabricated tubular pile, It is laid with metalling on soft soil foundation place to be processed, it is filling roadbed, complete soft subgrade treatment.
Preferably, the prefabricated tubular pile is in soft soil foundation place to be processed, it is in equilateral triangle, square or Quincunx laying.
Preferably, the jet pipe outside diameter is slightly less than prefabricated tubular pile internal diameter.
Preferably, the tubular pole top of the prefabricated tubular pile is concordant with foundation surface.
Preferably, being drained by row to the construct jet of the step 3) of prefabricated tubular pile along roadbed vertical section trend Process.
Preferably, the fractured-rock layer thickness is 40~60cm.
Preferably, the absolute altitude of the metalling is not less than at the top of pile cover.
Preferably, the jet-generating system is High-Pressure Compressor and air pump etc..
Preferably, using high-pressure rotary-spray jet when the air jet pipe is promoted in prefabricated tubular pile.
Preferably, the soft soil foundation place segmentation to be processed carries out basement process and roadbed filling.
The present invention had both solved that draining concretion method processing depth is limited, the processing time is longer, foundation bearing capacity is limited etc. asks The problems such as soil particle can block lateral hole when inscribing, and solving prefabricated tubular pile soil compaction effect, draw water.This method is convenient and efficient easily Operation, can accelerate to drain, make soil body quick-hardening;Uniformly, carrying can be improved in composite foundation processing for soil layer processing, effectively reduces road Differential settlement after base work is a kind of preferable Soft Soil Subgrade Treatment Method.
Detailed description of the invention
Fig. 1 is that high-pressure jet gas of the invention by tubular pole boxes out sideways diffusion to surrounding soil schematic diagram;
Fig. 2 be hollowcore precast of the invention box out horizontal channel draining that tubular pole mesohigh jet diffuses to form, in tubular pole Draw water schematic diagram;
Fig. 3 is cal rolling ground after high-pressure jet draining of the invention is drawn water, then pump drainage water schematic diagram in tubular pole;
What Fig. 4 was that the soil body of the invention hardens after form compound foundation soft soil roadbed fills schematic diagram.
Specific embodiment
The present invention is further elaborated and is illustrated with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation, its step are as follows:
1) smooth soft soil foundation place to be processed, sectional carries out subsequent basement process and roadbed filling herein.
2) in each construction section, the injection hollowcore precast tubular pole first into soft soil foundation, tubular pole bottom end is beaten to predetermined depth. It is uniformly provided with preformed hole on the pile lining of prefabricated tubular pile, the part pore water in sludge soft is made to enter prefabricated tubular pile inner cavity.In advance Tubulation stake can by design plane with equilateral triangle, square or it is quincunx laid, particular number according to area of base and Fixed, laying needs to meet certain density requirements.The tubular pole top of prefabricated tubular pile can keep concordant with foundation surface, in order to grind Pressure.
The preloading of the way abandoning tradition or vacuum preloading draining concretion method are boxed out pipe by directly squeezing into hollowcore precast Stake.Lateral soil compaction when prefabricated tubular pile is constructed squeezes into the part pore water after tubular pole in high-moisture percentage sludge soft and passes through preformed hole It converges in tubular pole, can be dissipated a part of excess pore water pressure with pre-release, can also slow down part soil compaction effect.
3) air jet pipe is applied using high pressure spray tracheae fastener driving device, enters the bottom gas outlet of air jet pipe in prefabricated tubular pile Bottom, then the top air inlet of injection pipe and the outlet of the jet-generating systems such as High-Pressure Compressor and air pump are connected with conduit Mouthful, conduit wants fasciculation long enough, is promoted convenient for high pressure spray tracheae.Carry out jet drainage procedure: by air jet pipe side from the bottom up Jet side is promoted slowly, and high-pressure rotary-spray jet can be used in jet mode, and high pressure gas is made to pass through the reserved hole horizontal of prefabricated tubular pile To surrounding soil is diffused to, in several gas passage gaps being laterally extended of prefabricated tubular pile circumferential direction formation, in surrounding soil Pore water is entered in prefabricated tubular pile by gas passage gap, accelerates discharging consolidation.
It should be noted that air jet pipe needs to bear high pressure, therefore high voltage bearing high pressure spray tracheae should be used.Outside air jet pipe Diameter should be slightly less than prefabricated tubular pile internal diameter, and between the two only there are some gaps, the two forms clearance fit, enable air jet pipe In enough smoothly insertion prefabricated tubular piles, but gap between the two is insufficient to allow the gas of lower part smoothly to overflow again, so that big portion absolutely Divide gas that can be discharged from the preformed hole of pile lining.In lifting process, high pressure gas by hollowcore precast tubular pole box out horizontal direction expand It is dissipated to surrounding soil and forms lateral splitting channel, is i.e. gas and drainage channel gap, accelerate discharging consolidation, solve draining Concretion method handles the problems such as depth is limited, the processing time is longer, foundation bearing capacity is limited, also solves prefabricated tubular pile soil compaction effect Soil particle can block the problems such as drainage channel when answering, drawing water.
High pressure spray tracheae can be arranged in rows, and carry out jet drainer to prefabricated tubular pile by row along roadbed vertical section trend Sequence.Start next row again after the completion of the jet draining of one row's prefabricated tubular pile, until completing all prefabricated tubular piles in the segmentation engineering Jet draining.Certainly it can also be spaced drained at jet draining in entire be segmented according to requirement of engineering.
4) after the jet drainage procedure for completing step 3) to prefabricated tubular pile, drainpipe can be transferred in prefabricated tubular pile.Such as Shown in Fig. 2, drainpipe extends to a bottom, is completely drawn out the water in tubular pole using water pump.Process of drawing water can also be along roadbed Vertical section trend by row draws water to prefabricated tubular pile.In the case where soil body draining horizontal channel is formed, solve live real Soil particle can enter the problem of prefabricated tubular pile transverse direction hole blocks preset drainage path, therefore periphery soil in the drainage procedure on border Pore water in body can swimmingly enter tubular pole.Since the migration velocity of Interstitial Water is slower, drawing water in this step can Certain time, intermittent starting, until tubular pole bottom does not have obvious ponding.
5) as shown in figure 3, soft soil foundation around the prefabricated tubular pile of step 4) is completed using cal rolling, it is deep to roll influence Original gas passage gap is depressed into disappearances in the soil body in degree range, the soil body can more consolidation, if the soil body is interior, there is still holes Gap water exists, and residual gap water can be pressed into prefabricated tubular pile.And the soil body outside influence depth range is rolled, being rolled influences to have Limit, less, the Interstitial Water in the soil body continues through gas passage gap and enters tubular pole internal drainage the variation of horizontal drainage channel.Cause After this is rolled, the water in tubular pole need to be extracted out using water pump again, make soil body quick-hardening.
6)) after soil body hardening, pile cover is arranged in prefabricated tubular pile and pile peripheral earth form compound foundation at the top of prefabricated tubular pile, 40~60cm metalling is laid on soft soil foundation place to be processed, the absolute altitude of metalling is quickly filled out not less than at the top of pile cover It builds the road base, completes soft subgrade treatment, as shown in Figure 4.
Carrying can be improved in the treatment process of composite foundation, effectively reduces differential settlement after roadbed work, is a kind of preferable Soft Soil Subgrade Treatment Method.And the processing method meets soft soil roadbed quick processing, quickly applies to build and is open to traffic, and improves carrying, control The characteristics of post-construction settlement of subgrade processed.
Above-mentioned embodiment is only a preferred solution of the present invention, so it is not intended to limiting the invention.Have The those of ordinary skill for closing technical field can also make various changes without departing from the spirit and scope of the present invention Change and modification.Therefore all mode technical solutions obtained for taking equivalent substitution or equivalent transformation, all fall within guarantor of the invention It protects in range.

Claims (10)

1. a kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation, which is characterized in that steps are as follows:
1) smooth soft soil foundation place to be processed;
2) into soft soil foundation, injection offers the hollowcore precast tubular pole of preformed hole, enters the part pore water in sludge soft Prefabricated tubular pile inner cavity;
3) air jet pipe is applied, so that the bottom gas outlet of air jet pipe is entered bottom in prefabricated tubular pile, then connect injection pipe with conduit The gas outlet of top air inlet and jet-generating system, by air jet pipe, edge injection side is promoted slowly from the bottom up, makes high pressure gas Surrounding soil is diffused to by the preformed hole horizontal direction of prefabricated tubular pile, circumferentially forms several gas being laterally extended in prefabricated tubular pile Body path clearance, the Interstitial Water in surrounding soil are entered in prefabricated tubular pile by gas passage gap, accelerate discharging consolidation;
4) after the jet drainage procedure for completing step 3) to prefabricated tubular pile, drainpipe is transferred in prefabricated tubular pile, it will using water pump Water extraction in tubular pole;
5) soft soil foundation around the prefabricated tubular pile of step 4) is completed using cal rolling, makes to roll the soil within the scope of influence depth Body more consolidation, wherein residual gap water is pressed into prefabricated tubular pile, and the soil body rolled outside influence depth range continues through The draining of gas passage gap;After rolling, the water in tubular pole is extracted out using water pump again, hardens the soil body;
6)) after soil body hardening, pile cover is arranged in prefabricated tubular pile and pile peripheral earth form compound foundation at the top of prefabricated tubular pile, to It is laid with metalling on the soft soil foundation place of processing, it is filling roadbed, complete soft subgrade treatment.
2. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described Prefabricated tubular pile in soft soil foundation place to be processed, in equilateral triangle, square or quincunx laying.
3. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described Jet pipe outside diameter be slightly less than prefabricated tubular pile internal diameter.
4. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described The tubular pole top of prefabricated tubular pile is concordant with foundation surface.
5. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that along road Base vertical section trend by row construct the jet drainage procedure of the step 3) to prefabricated tubular pile.
6. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described Fractured-rock layer thickness be 40~60cm.
7. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described The absolute altitude of metalling is not less than at the top of pile cover.
8. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described Jet-generating system be High-Pressure Compressor and air pump etc..
9. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that described Air jet pipe when being promoted in prefabricated tubular pile using high-pressure rotary-spray jet.
10. the Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation as described in claim 1, which is characterized in that institute The soft soil foundation place segmentation to be processed stated carries out basement process and roadbed filling.
CN201810886054.0A 2018-08-06 2018-08-06 A kind of Soft Soil Subgrade Treatment Method of soil body hardening form compound foundation Pending CN108999178A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111270671A (en) * 2020-01-20 2020-06-12 广州城市职业学院 High-pressure jet grouting pile construction process
CN111576387A (en) * 2020-05-29 2020-08-25 中铁隧道局集团有限公司 Soft soil foundation treatment method with large water content

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CN202323568U (en) * 2011-11-16 2012-07-11 中铁二院昆明勘察设计研究院有限责任公司 Pipe pile network/beam structure strengthening high-speed railway soft soil subgrade
CN204059332U (en) * 2014-05-30 2014-12-31 海南通程建筑工程有限公司 A kind of concrete precast pipe pile and piling prepressing Soft Ground device
CN106638552A (en) * 2016-11-08 2017-05-10 广西大学 Permeable pipe pile system capable of accelerating consolidation and construction method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102061695A (en) * 2010-12-09 2011-05-18 广东省航盛建设集团有限公司 Treatment method of drainage pipe pile composite foundation
CN202323568U (en) * 2011-11-16 2012-07-11 中铁二院昆明勘察设计研究院有限责任公司 Pipe pile network/beam structure strengthening high-speed railway soft soil subgrade
CN204059332U (en) * 2014-05-30 2014-12-31 海南通程建筑工程有限公司 A kind of concrete precast pipe pile and piling prepressing Soft Ground device
CN106638552A (en) * 2016-11-08 2017-05-10 广西大学 Permeable pipe pile system capable of accelerating consolidation and construction method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111270671A (en) * 2020-01-20 2020-06-12 广州城市职业学院 High-pressure jet grouting pile construction process
CN111576387A (en) * 2020-05-29 2020-08-25 中铁隧道局集团有限公司 Soft soil foundation treatment method with large water content

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