CN205636721U - Strain equipment that well vacuum preloading consolidated deep soft soil foundation - Google Patents

Strain equipment that well vacuum preloading consolidated deep soft soil foundation Download PDF

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Publication number
CN205636721U
CN205636721U CN201620249347.4U CN201620249347U CN205636721U CN 205636721 U CN205636721 U CN 205636721U CN 201620249347 U CN201620249347 U CN 201620249347U CN 205636721 U CN205636721 U CN 205636721U
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vacuum
well
equipment
tube
filter
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CN201620249347.4U
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Inventor
吉锋
冯旭松
李辉
别学清
翁佳兴
马志华
刘建龙
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East-Route of South-to-North Water Transfer Project Jiangsu Water Source Co., Lt
Jiangsu Hongji water source Polytron Technologies Inc
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East-Route Of South-To-North Water Transfer Project Jiangsu Water Source Co Lt
Jiangsu Hongji Hydraulic Engineering Construction Co Ltd
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Abstract

The utility model belongs to the technical field of the geotechnical engineering foundation treatment. The utility model provides a strain equipment that well vacuum preloading consolidated deep soft soil foundation, equipment is including straining well, vacuum apparatus, seal structure, slip casting device and connecting tube, and vacuum apparatus is connected to through the connecting tube and strains aboveground end, and seal structure is used for guaranteeing whole equipment sealing when vacuum preloading operates. It comprises sand well and vacuum tube combination to strain the well, the vacuum tube is located the intermediate position of sand well, and it comprises multistage PVC pipe and multistage strainer. The slip casting device is used for after vacuum preloading, and the vacuum tube that leads to filter well fills cement clay thick liquid and forms the cement mortar stake in the hole of straining the well. Equipment can reduce the linear loss of the vacuum of straining the well, makes to strain the full face vacuum of well and maintain high value, has guaranteed deep soft soil foundation whole and has consolidated the effect. Utilize the vacuum tube to annotate cement mortar toward the sand well simultaneously, form the cement stake, increased substantially the foundation bearing capacity.

Description

The equipment of filter well vacuum pre-press reinforcing deep soft soil foundation
Technical field
This utility model belongs to Geotechnical Engineering foundation treatment technology field, relates to a kind of deep soft soil foundation bracing means, the equipment of a kind of vacuum pre-press reinforcing deep soft soil foundation based on filter well construction.
Background technology
The problem often facing deep soft soil foundation consolidation process in the engineering constructions such as ocean, harbour, water conservancy, traffic.At present, vacuum method is widely used in Soft Soils Consolidation in A reality.Vacuum method is to arrange the displacement hulls such as vertical plastic draining belt or sand drain in treating reinforcing flexible foundation, upper sand bedding, cover film is closed again, bleed and make film internal drainage band, layer of sand etc. be in partial vacuum, get rid of the moisture in soil, make soil consolidate to reduce a kind of method for processing foundation of ground posterior settlement in advance.It was verified that vacuum method is a kind of economic soft-soil foundation treatment method reliably grown up based on native consolidation theory.But, during this technology implementation, negative pressure of vacuum can occur obvious linear loss along displacement hull when the ground degree of depth is transmitted, the vacuum transmission degree of depth is limited, and vacuum is difficult to effectively transmit to deep layer weak soil, when this causes technique of soft soil foundation treatment to be applied to deep soft soil foundation reinforcing engineering, bury deeper soft layer to can not get effectively reinforcing, the integral reinforcing effect of deep soft foundation is undesirable, and the pumpdown time is long, it is difficult to meet construction period.Additionally, the theoretical upper values of negative pressure of vacuum is 100kPa, it is limited that technique of soft soil foundation treatment improves soft base bearing capacity effect, requires higher reinforcing engineering for foundation bearing capacity, and vacuum pre-press reinforcing effect is difficult to reach to design requirement sometimes.
It is applied to vacuum transmission depth as shallow and the bottleneck problem for the treatment of effect existence limitation that deep layer soft soil foundation faces for technique of soft soil foundation treatment, the present invention provides the Apparatus and method for of a vacuum pre-press reinforcing deep soft soil foundation based on filter well construction, on the one hand vacuum can be overcome to soft soil foundation deep to transmit shallow problem, after vacuum preloading, existing displacement hull can be transformed into pile body simultaneously, increase substantially ground integral reinforcing effect.
Summary of the invention
The purpose of this utility model is the defect existed for existing technique of soft soil foundation treatment, solve the difficult problem that when technique of soft soil foundation treatment processes deep soft foundation, effective reinforcement depth is shallow and foundation bearing capacity raising is limited, it is provided that the equipment of a kind of novel filter well vacuum pre-press reinforcing deep soft soil foundation that can be effectively improved deep soft soil foundation integral reinforcing effect.The technical solution adopted in the utility model is as described below.
This utility model provides the equipment of a kind of novel filter well vacuum pre-press reinforcing deep soft soil foundation, described equipment includes filtering well, vacuum equipment, sealing structure, grouting device and connection pipeline, described vacuum equipment is connected to filter aboveground end by connecting pipeline, and described sealing structure is for ensureing the sealing when vacuum preloading operates of the whole equipment.Described filter well is combined by sand drain and vacuum tube and constitutes, and described vacuum tube is positioned at the centre position of sand drain, and it is made up of multistage pvc pipe and multistage filter pipe.Described grouting device is for after vacuum preloading terminates, and cement-bentonite grout is filled in the hole of filter well be formed cement mortar stake by the vacuum tube of logical screened well.
Described grouting device includes Grouting Pipe, Pressure gauge, control valve, grouting pump and slurry storing tank, in use, one end of described Grouting Pipe is connected with the vacuum tube of filter well, the other end is connected with grouting pump, described Pressure gauge and control valve are arranged in Grouting Pipe, and described slurry storing tank is connected with grouting pump.
Further, a diameter of the 10 of described sand drain~20cm, medium sand and the coarse sand of prototype gradation selected by the sand material of filling, and clay content should be less than 3%.A diameter of the 1 of described vacuum tube~2cm, its length is identical with sand drain.The single long length of described filter pipe is 1~2m.
Further, described connection pipeline includes supervisor, arm, connecting tube and union joint, described supervisor one end is connected with vacuum equipment, and described supervisor is connected with an arm in each position connecting filter well, and the other end of each arm is connected with the vacuum tube of filter well by connecting tube and/or union joint.Described sealing structure is included on the soil layer needed reinforcement laying at least one of which geotextiles and at least one of which diaphragm seal, and the press mold ditch of place periphery excavation.Described filter well can use quincunx or square laying, and laying spacing is 1~2m.
The said equipment that this utility model provides, have employed novel filter well construction, and described filter well is combined by sand drain and vacuum tube and constitutes, and described vacuum tube is made up of multistage pvc pipe and multistage filter pipe.The vacuum tube punched relative to traditional draining board and full pipe or drain pipe, vacuum linear loss in the vacuum tube that this utility model uses is the least, this is because pvc pipe limits the loss of vacuum, thus strengthen the consolidation effect burying deeper weak soil, save the engineering time, make the foundation bearing capacity after reinforcing improve.In practical operation, pvc pipe and the distribution of filter pipe can be arranged according to the practical situation of soft soil foundation, the filter pipe of multistage or longer is set at the deep soil layer needing emphasis to reinforce, and the filter pipe of few section or shorter is set at the secondary shallow soil layer easily reinforced.Vacuum tube thus can be made to remain to keep higher vacuum at deep soil layer, strengthen the consolidation effect of deep soil ground.
The said equipment is after opening vacuum equipment, when under diaphragm seal, vacustat is at more than 85kPa, and the stable fine vacuum angle value at more than 70kPa of filter well tunneling boring.
Except using novel filter well to replace draining board, reduce vacuum linear loss in vacuum tube, this utility model also uses the intensity of the further consolidated subsoil of mode by the filter well backfilling cement mortar of sand material structure, especially cement mortar and sand drain generation cementation forms concrete stake, further function as the consolidation effect of composite foundation, the bearing capacity of ground has been greatly enhanced.The method of novel filter well vacuum pre-press reinforcing deep soft soil foundation carries out flexible Application according to the geological conditions that soft base is different, avoid the machine-made way of traditional vacuum prestressing technology, can significantly accelerate discharging consolidation, shorten the construction period, it is ensured that deep soft soil foundation integral reinforcing effect.
This utility model has the following technical effect that 1, reduces the linear loss of the vacuum of filter well, makes the full face vacuum of filter well maintain high level, it is ensured that deep soft soil foundation integral reinforcing effect, improves foundation bearing capacity.2, can significantly accelerate discharging consolidation, shorten the engineering time.3, utilize the drainage system that vacuum preloading is existing, sand drain is carried out cementing mortar, displacement hull is transformed into pile body, formed and meet ground effect, increase substantially foundation bearing capacity;4, simple and reliable, economical and practical, market range of application is wide.
Accompanying drawing explanation
Fig. 1 is the structural representation of the equipment of the filter well vacuum pre-press reinforcing deep soft soil foundation in this utility model embodiment.
Fig. 2 is the grouting device schematic diagram of the equipment of the filter well vacuum pre-press reinforcing deep soft soil foundation in this utility model embodiment.
Wherein, 1 is filter well, and 2 is vacuum tube, and 3 is minor diameter sand drain, and 4 is pvc pipe, and 5 is filter pipe, and 6 is supervisor, and 7 is arm, and 8 is vacuum equipment, and 9 is union joint, and 10 is connecting tube, and 11 is geotextiles and diaphragm seal, and 12 is press mold ditch.
Detailed description of the invention
With specific embodiment, the technical solution of the utility model is illustrated below in conjunction with the accompanying drawings, but the technical solution of the utility model is not limited by following embodiment.
Embodiment 1
The Apparatus and method for of the novel filter well vacuum pre-press reinforcing deep soft soil foundation of the present embodiment is implemented on certain deep soft foundation reinforcing engineering, as shown in Figure 1, the complex geologic conditions of this deep soft foundation, distribution soft layer in 20m depth bounds under levee body, soft layer thickness is big, moisture content is high, intensity is low, sedimentation instability.
As shown in Figure 1, the equipment of novel filter well vacuum pre-press reinforcing deep soft soil foundation, described equipment includes filtering well 1, vacuum equipment 8, sealing structure and connect pipeline, described vacuum equipment 8 is connected to filter well 1 upper end by connecting pipeline, and filter well 1 and connection pipeline can be isolated from the outside by described sealing structure.Described filter well 1 is combined by sand drain 3 and vacuum tube 2 and constitutes, and described vacuum tube 2 is positioned at the centre position of sand drain 3, and it is made up of 3 sections of pvc pipes 4 and 3 sections of filter pipes 5.
Described grouting device includes Grouting Pipe 13, Pressure gauge 14, controls valve 15, grouting pump 16 and slurry storing tank 17, in use, one end of described Grouting Pipe 13 is connected with the vacuum tube 2 of filter well 1, the other end is connected with grouting pump 16, described Pressure gauge 14 and control valve 15 are arranged in Grouting Pipe 13, and described slurry storing tank 17 is connected with grouting pump 16.
A diameter of 15cm of described sand drain, the sand material of filling selects prototype gradation and clay content to should be less than the medium sand of 3%.A diameter of 1.6cm of described vacuum tube, the length of sand drain and vacuum tube is 15m.Described pvc pipe 4 length is respectively 5m, 5m and 2m, and the pvc pipe 4 of 2m is positioned at foot, and filter pipe 5 length is 1m.
Described connection pipeline includes being responsible for 6, arm 7, connecting tube 10 and union joint 9, described supervisor 6 one end is connected with vacuum equipment 8, described supervisor 6 is connected with an arm 7 in each position connecting filter well 1, and the other end of each arm 7 is connected with the vacuum tube 2 of filter well 1 by connecting tube 10 and/or union joint 9.Described sealing structure is included on the soil layer needed reinforcement one layer of geotextiles 11 of laying and 3 layers of diaphragm seal 11, and the press mold ditch 12 of place periphery excavation.Described filter well 1 uses quincunx laying, laying spacing to be 1.5m.
The said equipment is after opening vacuum equipment, when under diaphragm seal, vacustat is at more than 85kPa, and the stable fine vacuum angle value at more than 70kPa of filter well tunneling boring.
Use the equipment of filter well vacuum pre-press reinforcing deep soft soil foundation method to be embodied as step as follows:
It is to be combined by vacuum tube 2 and minor diameter sand drain 3 to constitute that the first step, novel filter well design novel filter well 1, and the total length of novel filter well 1 is projected depth 15m.A diameter of 15cm of minor diameter sand drain 3, the sand material of filling selects prototype gradation and clay content to should be less than the medium sand of 3%.Vacuum tube 2 is positioned at minor diameter sand drain 3 centre position, a diameter of 1.6cm, a length of 15m.Vacuum tube is made up of 3 sections of pvc pipes 4 and 3 sections of filter pipes 5, and pvc pipe 4 length is respectively 5m, 5m and 2m, and the pvc pipe 4 of 2m is positioned at foot, and filter pipe 5 length is 1m.
Second step, novel filter well set the pending soil layer of leveling, set novel filter well 1 to projected depth, novel filter well 1 spacing 1.5m, quincunx laying.
3rd step, pipe-line system are connected to reinforce surface, place and lay supervisor 6, it is responsible for 6 one end to be connected with vacuum equipment 8, supervisor 6 separates an arm 7 in the position often arranging novel filter well 1, every arm 7 is connected with the vacuum tube 2 of novel filter well 1 by union joint 9 and connecting tube 10, entire row of having connected novel filter well 1, forms pipe-line system.
After 4th step, place sealing pipe-line system have connected, pending soil layer is laid one layer of 250g/m2 geotextiles 11, then lay 3 layer thicknesses not less than 0.12mm diaphragm seal 11, place periphery excavation press mold ditch 12.
5th step, vacuum drainage consolidation opens vacuum equipment 8, when 11 times vacustats of diaphragm seal are at more than 85kPa, and the stable fine vacuum angle value at more than 70kPa of novel filter well 1 tunneling boring, it is achieved deep soft soil foundation tunneling boring fine vacuum discharging consolidation.
Postponing at vacuum preloading process in 90 days, the levee foundation degree of consolidation reaches 95%, more than design load 90%.After novel filter well slip casting forms cement mortar stake, the bearing capacity of composite foundation reaches more than 120kPa, and consolidation effect is notable.
In addition to the implementation, this utility model can also have other embodiments.The technical scheme that all employing equivalents or equivalent transformation are formed, all falls within the protection domain of this utility model requirement.

Claims (6)

1. the equipment of a novel filter well vacuum pre-press reinforcing deep soft soil foundation, described equipment includes filtering well, vacuum equipment, sealing structure, grouting device and connection pipeline, described vacuum equipment is connected to filter aboveground end by connecting pipeline, described sealing structure is for ensureing the sealing when vacuum preloading operates of the whole equipment, it is characterized in that: described filter well is combined by sand drain and vacuum tube and constitutes, described vacuum tube is positioned at the centre position of sand drain, and it is made up of multistage pvc pipe and multistage filter pipe;Described grouting device is for after vacuum preloading terminates, and cement-bentonite grout is filled in the hole of filter well be formed cement mortar stake by the vacuum tube of logical screened well.
Equipment the most according to claim 1, it is characterized in that: described grouting device includes Grouting Pipe, Pressure gauge, control valve, grouting pump and slurry storing tank, in use, one end of described Grouting Pipe is connected with the vacuum tube of filter well, the other end is connected with grouting pump, described Pressure gauge and control valve are arranged in Grouting Pipe, and described slurry storing tank is connected with grouting pump.
Equipment the most according to claim 1 and 2, it is characterised in that: a diameter of the 10 of described sand drain~20cm, medium sand and the coarse sand of prototype gradation selected by the sand material of filling;A diameter of the 1 of described vacuum tube~2cm, its length is identical with sand drain;The single long length of described filter pipe is 1~2m.
Equipment the most according to claim 1 and 2, it is characterized in that: described connection pipeline includes supervisor, arm, connecting tube and union joint, described supervisor one end is connected with vacuum equipment, described supervisor is connected with an arm in each position connecting filter well, and the other end of each arm is connected with the vacuum tube of filter well by connecting tube and union joint;Described sealing structure is included on the soil layer needed reinforcement laying at least one of which geotextiles and at least one of which diaphragm seal, and the press mold ditch of place periphery excavation.
Equipment the most according to claim 1 and 2, it is characterised in that: described filter well can use quincunx or square laying, and laying spacing is 1~2m.
Equipment the most according to claim 1 and 2, it is characterised in that: when starting after evacuation when under sealing structure, vacustat is at more than 85kPa, the filter full face vacustat of well is at more than 70kPa.
CN201620249347.4U 2016-03-29 2016-03-29 Strain equipment that well vacuum preloading consolidated deep soft soil foundation Active CN205636721U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105804045A (en) * 2016-03-29 2016-07-27 江苏鸿基水利建设工程有限公司 Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method
CN107916663A (en) * 2017-11-16 2018-04-17 丁碧江 A kind of construction method for soft soil foundation
CN109826189A (en) * 2019-01-28 2019-05-31 三峡大学 Stake device and method processed
CN111945497A (en) * 2020-06-22 2020-11-17 中南大学 Concrete structure pore filling operation device and method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105804045A (en) * 2016-03-29 2016-07-27 江苏鸿基水利建设工程有限公司 Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method
CN107916663A (en) * 2017-11-16 2018-04-17 丁碧江 A kind of construction method for soft soil foundation
CN107916663B (en) * 2017-11-16 2020-02-07 丁碧江 Construction method for soft soil foundation
CN109826189A (en) * 2019-01-28 2019-05-31 三峡大学 Stake device and method processed
CN109826189B (en) * 2019-01-28 2020-09-08 三峡大学 Pile making device and method
CN111945497A (en) * 2020-06-22 2020-11-17 中南大学 Concrete structure pore filling operation device and method

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C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180716

Address after: 225000 Workers'Village No. 150, Yanfu East Road, Yangzhou City, Jiangsu Province

Co-patentee after: East-Route of South-to-North Water Transfer Project Jiangsu Water Source Co., Lt

Patentee after: Jiangsu Hongji water source Polytron Technologies Inc

Address before: 225000 150 workers' er village, Yanfu East Road, Guangling District, Yangzhou, Jiangsu.

Co-patentee before: East-Route of South-to-North Water Transfer Project Jiangsu Water Source Co., Lt

Patentee before: Jiangsu Hongji Hydraulic Engineering Construction Co., Ltd.