CN103015400B - Efficient quick method for treating separated directly-connected vacuum preloaded foundation - Google Patents
Efficient quick method for treating separated directly-connected vacuum preloaded foundation Download PDFInfo
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- CN103015400B CN103015400B CN201310009774.6A CN201310009774A CN103015400B CN 103015400 B CN103015400 B CN 103015400B CN 201310009774 A CN201310009774 A CN 201310009774A CN 103015400 B CN103015400 B CN 103015400B
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Abstract
The invention provides an efficient quick method for treating separated directly-connected vacuum preloaded foundation. The efficient quick method mainly includes: paving knitted cloth or geotextile on a soft foundation to be treated; arranging longitudinal plastic drainers; mounting a vacuum delivering pipe network; arranging water and steam separators; paving a sealing film; mounting a vacuum control room; and vacuumizing. In the efficient quick method, a medium-coarse sand cushion layer in a routine vacuum preloading method is replaced, and a path for delivering vacuum is shortened. Meanwhile, due to the arrangement of the water and steam separators, an air exhausting theory in the conventional vacuum preloading method is changed, curing time is shortened, curing effect is improved, and quickness, efficiency, energy-conservation and environment-friendliness of a construction process are realized.
Description
Technical field
The present invention is a kind of foundation treatment technology, and particularly relate to a kind of efficient direct-connected vacuum prepressing ground foundation treatment method of separate type fast, the method is mainly applicable to weak soil or super soft ground, belongs to geotechnical engineering field.
Background technology
Along with the large-scale Scale Sea Reclamation Project in China coast harbour and Coastal Zone Development project flourish.Dalian, Tianjin, Jiangsu, Zhejiang are coastal all at reclaiming land around sea on a large scale with, Guangdong, Guangxi and Hainan etc.These areas mostly are the Muddy Bottoms class weak soil of high-moisture, high-compressibility.The economic construction of China's high speed development is badly in need of wanting soft foundation processing technology that is quick, efficient, energy-saving and environmental protection.In the eighties mid-term in last century, the technique of soft soil foundation treatment grown up, through the development of nearly two more than ten years and constantly perfect.Develop into vacuum combined stack-load from single vacuum method, vacuum combinedly cover the engineering methods such as water treatment, low position vacuum preloading, directly discharging type vacuum prepressing.Make it in engineer applied, achieve certain success, and be widely used in the treatment of soft foundation engineering of Scale Sea Reclamation Project.
Find, although conventional vacuum preloading technology is a kind of effective soft foundation processing technology, also to there is larger limitation through practical application.Treating depth is less than to the soft base of 15m, consolidation process needs to consume a large amount of medium coarse sand bed course, need to consume a large amount of electric energy and needs longer construction period.Treating depth is more than the soft base of 15m, and due to the linear loss of vacuum, deep is difficult to again obtain effective consolidation effect, and the processing time is often longer, can not meet the needs of practical implementation.Therefore, researching and developing a kind of soft foundation processing new technologies that are quick, efficient, energy-saving and environmental protection is active demands that existing market develops.The in line precompressed flexible foundation treatment method of efficient quick detachable vacuum of the present invention's research and development is by improving transverse drainage system, with vacuum chimney filter and butterfly joint and band drain be directly connected instead of traditional in slightly bed course, save resource.Adopt water vapor separation system, according to the automatic regulation function of load variations, replacing conventional fluidic pump to utilize recirculated water to form the principle of vacuum by changing gas capacity, saving a large amount of electric energy and distribution facility, simultaneously, owing to improve the usefulness of negative pressure of vacuum, accelerate the directed flow of hydrone in the soil body, accelerate soil solidifying, be advanced by the duration, save a large amount of electric energy, achieve efficiently convenient, the energy-saving safety vacuumized.
Summary of the invention
The present invention relates to a kind of efficient direct-connected vacuum preloading flexible foundation treatment method of separate type fast, the method overcome a large amount of use medium coarse sand bed course in conventional vacuum precompressed, consume the defect of ample resources, decrease the transmission loss of vacuum in original medium coarse sand pad, shorten vacuum bang path; Improve the operating principle of conventional fluidic vacuum pump, adopt moisture separator to carry out the separation of aqueous vapor, accelerate the directed flow of water body, improve the approach maintaining vacuum pressure, improve vacuum efficiency, a large amount of electric energy of saving and corresponding distribution facility; For longitudinal drainage body, have employed filament fiber without spinning membrane filter, increase the effective aperture of filter membrane.Change in traditional vacuum the habitual thinking maintaining vacuum pressure, have employed the method for substep, Discrete control vacuum, thus effectively prevent the earth alluvial in vacuum, decrease the silting impact under the effect of ultrahigh vacuum pressure.
For achieving the above object, the present invention adopts
technical schemethe high performance longitudinal drainage material of main selection, improvement is known clearly vacuum lateral transport system, vacuum water air separation is set, changes original principle vacuumized, add substep, segmentation maintains the step of vacuum pressure and carried out a complete subgrade work progress.
This technical side is by comprising the following steps: lay woven cloth or geotextiles on subgrade surface to be processed; Set longitudinal plastic row water body; Vacuum is installed and transmits pipe network; Vacuum water air separation is set; Lay diaphragm seal; Vacuum control room is installed; Vacuumize.
(1), lay woven cloth and geotextiles as horizontal bed course at soft primary surface, mainly for solve top layer can on original earth's surface people, on equipment carry out the object of constructing operation, if top layer is weaker, also can increase paving chaste tree fragrant plant, the sticky silt of backfill is used as construction cushion coat.
(2), select longitudinal plastic row water body of special substance, draining central layer adopts polyethylene or polypropylene material, outer wrapping filament fiber hot melt adhesive non-woven fabrics filter membrane, filter membrane effective aperture O
95be 0.05 ~ 0.15mm.Exceed prior art specification and market specifications O
95the filter membrane material of≤0.075mm.Increase the aperture of water discharging body, prevent clay particle in motion process through alluvial during filter membrane and blockage problem.
(3), arrange vacuum transmission pipe network, the PVC plastic pipe that in lateral arrangement pipe network, supervisor is diameter 50 ~ 75mm, arrangement pitch is 15 ~ 25m, forms by four-way, threeway the key pipe network that vacuum is transmitted.At supervisor's layout arm off the net, arm is that every two row longitudinal drainage body intervals are arranged, arm is inner ring wired hose, and diameter is 30 ~ 40mm, and compressive resistance reaches 25.0MPa, and both sides plastic draining wrench is directly connected by butterfly joint by centre.Level of simultaneously arranging between the band drain of spacer region is to placement plastic draining board, and both sides are connected with arm by butterfly joint, as increasing the draining of foundation surface and maintaining the effect of surface vacuum load.The horizontal drainage system formed instead of medium coarse sand bed course in conventional vacuum precompressed and horizontal drainage chimney filter.
(4), water vapor separation system is installed, in place, edge buries moisture separator underground, separator divides upper and lower two parts, with horizontal seal film for boundary, upper one end is directly connected with vacuum pipe network, the other end arranges vacuum exhaust line and outfall, and extract duct is directly connected with vacuum pump, pipeline is established one way stop peturn valve and water inflow filter.Separator bottom installing submersible pump.Two submersible pumps are arranged on differing heights position, separator bottom, and enter gutter by after gutter parallel connection by separator upper portion side wall outfall, one way stop peturn valve established by gutter.Vacuum pump is connected with separator stack, stack is installed one way stop peturn valve and pressure vacuum gauge.
(5), seal and extract system, sealing adopts polyethylene or polyvinyl chloride film to carry out the sealing of place.When vacuumizing, the vacuum pressure on controlling in advance pipe network is within vacuumizing 15 days under 50 ~ 60kPa, and within vacuumizing 30 days under maintaining vacuum pressure 60 ~ 70kPa, last vacuum pressure >=80kPa vacuumizes and is not less than 45 days.
With original Technical comparing, this invention
beneficial effectbe:
1, present invention employs the filter membrane material breaking through code requirement, increase effective draining aperture, accelerate the discharge of muddy water in ground, decrease clay by silting impact during filter membrane.Improve vacuum transmission effect.
2, the vacuum lateral transport pipe network of the present invention's layout and the plastic draining board of laterally laying, instead of the 0.30 ~ 0.50m medium coarse sand bed course as horizontal drainage and vacuum transmission path in traditional vacuum precompressed, save direct cost
25%.Shorten the bang path of vacuum simultaneously, decrease the linear loss of vacuum, improve vacuum transmission efficiency.
3, the gas and water separator of the present invention's employing, changes the operating principle of conventional fluidic vacuum pump, is separated gentle for the water of extraction, water is discharged by submersible pump, vacuum pressure only maintains by vacuum pump, thus decreases a large amount of vacuum equipments, directly saves electricity more than 2/3.Reach saving construction costs
15%benefit.
4, while the present invention saves electricity consumption, also reduce and need the transmission line of electricity of preparation and the expense of power transmitting device.And Electrical Safety is brought to the guarantee of essence.
5, construction equipment structure of the present invention is simple, easy to use.
Accompanying drawing explanation
fig. 1:moisture separation device organigram.
fig. 2:the direct-connected sectional schematic diagram of separate type
fig. 3:laterally direct-connected schematic diagram.
In figure: 1, vacuum pump, 2, pressure vacuum gauge, 3, one way valve, 4, flap valve, 5, submersible pump, 6, water inflow filter, 7, vacuum exhaust line, 8, gutter, 9, water vapor transmission supervisor, 10, waterproof power distribution equipment, 11, moisture separation device, 12, vacuum manifold, 13, diaphragm seal, 14, butterfly joint, 15, longitudinal plastic draining board.
Detailed description of the invention
Efficient separate type fast direct-connected vacuum precompressed soft foundation process construction incorporation engineering example carries out as follows:
1, construction equipment prepares
According to construction plan, implement the configuration of equipment, accessory, and safeguarded in time, made all machinery be in good state, met the needs of construction, for the progress and quality guaranteeing construction provides strong logistics support.
(1), loading conveyor tool: intend arrangement 50 tipping truck muck haulage backfills; 1 bulldozer and 1 loader is arranged to carry out leveling operation; 4, excavator is arranged to carry out loading and unloading soil and the digging of press mold ditch; And carry out the construction of clay sealing curtain wall.
(2), plate: for ensureing programming, this engineering is intended carrying out mechanical execution with 10 slotting triggers;
(3), measuring apparatus: total powerstation 1, level gauge 1 etc.;
(4), vaccum-pumping equipment: drop into 8 high-efficiency and energy-saving type vacuum pumps;
(5), main production, living facilities prepare.
, lay geotextiles construction
For ensureing to set smoothly plastic draining board, the constructing on Backfill Foundation of safety, first lay one deck 400g geotextiles on whole soil mass consolidation top layer, geotextiles must make connection by integrally, and lap width is not less than 15cm.Local comparatively hag district repaves geotextiles after need spreading 2 floor chaste tree fragrant plant sheets.
, high performance plastics band drain construction
Plastic Drain Slab Construction will strictly observe the requirement of code, and implement by following construction sequence:
(1), within the scope of each reinforcement block that setting-out is determined, go out plastic draining board set plate position by square measuring, measuring control errors is within ± 30mm.
, plastic draining board all by arranged in squares, under constructing operation personnel control inserted link insert time perpendicularity deviation must not be greater than ± 1.5%.
(3), upper plug bar is to exceeding top layer 50cm.During upper plug bar, constructor should examine band drain with or without rewinding phenomenon, if rewind length more than 50cm, then and the other 45cm place complement one carry out construction note in plate position.
(4), cut band drain, controlling protruded length is more than 50cm.
(5), the construction of next root band drain is carried out in displacement.
(6), in band drain work progress, special messenger does construction original record.After each piecemeal Plastic Drain Slab Construction completes, band drain wrench housekeeping is carried out in cleaning stabilization zone in time, then carries out subsequent processing construction.
, plastic draining board positive square arrangement pitch 1.0m, band drain upper end exceed soil layer surface 50cm.Be connected with dish-shaped joint and vacuum manifold road in the horizontal direction before covering diaphragm seal.
, high performance plastics band drain relevant technologies index
The quality of plastic draining board performance will meet following table and plan requirement, often coils plastic draining board simultaneously before installation and in work progress, carries out visual inspection, finds defectively to stop using immediately.Plastic draining board technical indicator sees the following form:
band drain technical indicator table
5, ditch construction is sealed
The construction of sealing ditch should be undertaken by following requirements:
(1), this precompressed zone surrounding excavation press mold ditch.Use transit unwrapping wire before excavation, and carry out mark.
(2), adopt machinery to be aided with artificial ditching, ensure cross dimensions during excavation, cut off pervious layer.The sand in press mold ditch district, silt complete liquidation is clean, and transport to outside stabilization zone and deposit.
(3), press mold trench depth can determine according to on-site actual situations, but must cut off pervious layer, the most shallowly enters below impervious layer end face 500mm, and side slope is preferably 2:1.
(4), the plastic plate at press mold ditch place do not cut off, and upwards will be inserted in sand cushion along limes marginis, intubating length is no less than 20cm.
(5), film will spread to surrounding sealing ditch bottom of trench and use the back fill seals ditch such as mud, clay and compacting.
, vacuum tube arrange and be connected
(1), vacuum transmits pipe network and press plan and arrange, vacuum manifold adopts steel wire flexible rubber hose, and be connected with dish-shaped joint, interface ail gun is fixed, and rifle ailhead can not upward, in order to avoid puncture filter membrane, and the vacuum manifold place of intersecting employing two-way, threeway or four-way connection.Vacuum manifold connects plastic draining board through butterfly joint, and fixes with ail gun.
(2), lay main, vacuum tube and butterfly joint, first butterfly joint is connected with draining wrench, then main a, vacuum tube is laid, be responsible for and adopt reducing tee to be connected with arm, finally butterfly joint and arm are connected, after all having connected, driven vacuum pump, test each vacuum pump, whether analyzing adapter has gas leak phenomenon, every 8 ~ 100,000 m
2arrange 2 55kw vacuum pumps.
, diaphragm seal lay requirement
(1), it is guarantee that vacuum spends the strong guarantee of vacuum in advance that diaphragm seal covers outermost layer, so monoblock diaphragm seal must be adopted to seal, film sealing is expanded to outside press mold ditch, the vacuum of whole vacuum preloading inside can be guaranteed, diaphragm seal adopts 0.12mm polymeric seal film and one deck 400g geotextiles film lower protective layer, laying order is as follows: first lay one deck geotextiles above, geotextiles must be sewn into monoblock, repave 3 layers of diaphragm seal, geotextiles and diaphragm seal will spread to surrounding sealing ditch bottom of trench mud, the back fill seals ditches such as clay compacting, after whole laying, carry out vacuumizing test whether to leak gas.
(2), diaphragm seal specification and technical indicator are as following table:
diaphragm seal performance indications table
, vacuum main road by being pooled to after membrane device in steam mixing tube, be then connected with moisture separation device with flap valve by one way valve.After steam mixture enters separation, carry out steam separation.Water is deposited on the bottom of retaining tank body, is independently discharged by submersible pump.
, be separated after gas enter gas delivery conduit, directly enter vacuum pump body after entering water inflow filter by flap valve.The connection of membrane device must be firm, and sealing performance is reliable and secure, and whether will open vacuum pump test connecting portion after connecting has gas leak phenomenon.
, Vacuum precompression construction technique requirement
(1), band drain is connected with arm pipe: butterfly joint and band drain connect must be fixed with more than two steel nails, and tube connector also must be fixed with steel nail.
(2), bury gauge head under film underground: under film, vacuum probe is arranged in two chimney filter centre positions, quantity and position are pressed design drawing and are laid, intuitively to reflect under-membrance vacuum degree.
(3), vacuum pump is installed: this engineering selects high-efficiency energy-saving vacuum system to vacuumize, a set of responsible 8 ~ 100,000 m
2.Wherein every 10,000 m
2a steam knockout drum is installed.
(4), vacuum preloading is bled: install vacuum pump system, by after the circuit ON of electrician room switchbox → vacuum pump place leakage switch box → vacuum pump, examination vacuumizes.On film, press mold ditch place carefully checks with or without air-leak section, mends in time after discovery.General when bleeding, gas leakage eyelet can send tweeting sound, follows sound and overhauls.
Incipient stage, for preventing vacuum preloading, flash disruption is caused to stabilization zone surrounding soil, strictly must control evacuation rate, vacuum pressure on controlling in advance pipe network is vacuumize 15 days under 50 ~ 60kPa, 30 days are vacuumized under maintaining vacuum pressure 60 ~ 70kPa, on inspection without after gas leak phenomenon, under-membrance vacuum degree is brought up to more than 80kPa and vacuumize 45 days.
In implementation process, accurate recording is given to vacuum, and all will carry out detailed record to equipment operation situation, electric power thus supplied and other vacuum preloading construction situations.
By the vacuum preloading process of nearly 90 days, eliminate sedimentation 1.75m, the degree of consolidation reached 85%.Vane-shear index is from 8 ~ 12kPa degree of carrying to 22 ~ 28kPa.The natural moisture content of soil has been reduced to 40 ~ 45% from 60 ~ 70%.The bearing capacity intensity level of the soil body is from 30 ~ 40kPa degree of carrying to 65 ~ 80kPa.Reach the effect of precompressed process.
Claims (4)
1. the efficient direct-connected vacuum preloading flexible foundation treatment method of separate type fast, is characterized in that, comprise the following steps: lay woven cloth or geotextiles on subgrade surface to be processed; Set longitudinal plastic row water body; Vacuum is installed and transmits pipe network; Vacuum water air separation is set; Lay diaphragm seal; Vacuum control room is installed; Vacuumize; When vacuumizing, the vacuum pressure on controlling in advance pipe network is within vacuumizing 15 days under 50 ~ 60kPa, and within vacuumizing 30 days under maintaining vacuum pressure 60 ~ 70kPa, last vacuum pressure >=80kPa vacuumizes and is not less than 45 days;
Described vacuum is transmitted pipe network and is comprised main vacuum tube and a vacuum tube, and wherein main vacuum tube is the PVC plastic pipe of diameter 50 ~ 75mm, the inner ring wired hose that a vacuum tube is diameter 30 ~ 40mm, compressive resistance reaches 25.0MPa; Prop up vacuum tube to be directly connected with plastic row water body by butterfly joint, a vacuum tube for installation is arranged in the middle of the longitudinal plastic row water bodys of two rows, and spacing is 0.8 ~ 1.50m;
Described vacuum water air separation is the vacuum water air separation buried underground at place edge, vacuum water air separation upper one end and vacuum are transmitted pipe network and are directly connected, the other end arranges Vacuum exhaust tube and gutter, Vacuum exhaust tube is connected with vacuum pump, and Vacuum exhaust tube establishes one way stop peturn valve; Moisture separator bottom installing submersible pump, submersible pump is arranged on differing heights position, moisture separator bottom, is connected, gutter arranges one way stop peturn valve after in parallel by moisture separator sidewall outfall with gutter;
Described diaphragm seal is polyethylene or polyvinyl chloride film, thickness 0.12 ~ 0.16mm, the tensile strength >=18.5/16.5MPa of longitudinally/transverse direction.
2. the efficient direct-connected vacuum preloading flexible foundation treatment method of separate type fast according to claim 1, it is characterized in that, the woven cloth mass area ratio of laying is 120 ~ 300g, and geotextiles mass area ratio is 200 ~ 600g, lap width >=20cm.
3. the efficient direct-connected vacuum preloading flexible foundation treatment method of separate type fast according to claim 1, it is characterized in that, the longitudinal plastic row water body set is width is 100 ± 2mm, thickness is 3.5 ~ 4.5mm and in the polypropylene of " ten " shape or polyethylene material plastic draining board, outer wrapping filament fiber hot melt adhesive non-woven fabrics filter membrane, filter membrane effective aperture O95 is 0.05 ~ 0.15mm.
4. the efficient direct-connected vacuum preloading flexible foundation treatment method of separate type fast as claimed in claim 1, it is characterized in that, vacuum control room is provided with two vacuum pumps, vacuum pump is connected with the Vacuum exhaust tube of vacuum water air separation, Vacuum exhaust tube is installed one way stop peturn valve and pressure vacuum gauge, vacuum control room establishes operation supervise and control platform directly to transmit pipe network with gutter, vacuum water air separation, vacuum and place pressure vacuum gauge is connected.
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Families Citing this family (11)
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| CN103541345B (en) * | 2013-10-15 | 2015-11-25 | 梁永根 | Aqueous vapor separate vacuum preloading and device |
| CN103628465A (en) * | 2013-11-15 | 2014-03-12 | 河海大学 | Device and method for circulating water discharging blocking prevention through exhausting and inflating sludge |
| CN103866756B (en) * | 2014-04-02 | 2015-03-11 | 河北晟港工程技术有限公司 | Oversized-area efficient energy-saving vacuumizing soft foundation treatment system and construction method |
| CN104294812B (en) * | 2014-09-09 | 2016-08-24 | 江苏鑫泰岩土科技有限公司 | Vacuum preloading roly-poly type captation |
| CN104563091A (en) * | 2014-12-24 | 2015-04-29 | 宁波高新区围海工程技术开发有限公司 | Structure and method for processing consolidation of water pumping and air exhausting soft foundation |
| CN108918023A (en) * | 2018-08-23 | 2018-11-30 | 浙江省水利水电勘测设计院 | A kind of soil under vacuum preloading vacuum degree monitoring device and method |
| CN110206016A (en) * | 2019-06-17 | 2019-09-06 | 盐城市京兆机泵制造有限公司 | A kind of soft foundation treatment process using vacuum preloading |
| CN111018278A (en) * | 2019-12-13 | 2020-04-17 | 中交四航工程研究院有限公司 | In-situ remediation system and method combining bottom sediment heavy metal pollution treatment with dehydration and solidification |
| CN111498933A (en) * | 2020-03-31 | 2020-08-07 | 温州大学 | Self-balancing movable type detachable vacuum prepressing gas-liquid separation device |
| CN112555145A (en) * | 2020-12-21 | 2021-03-26 | 广东省珠海工程勘察院 | Water pumping device of electrochemical soft soil solidification system |
| CN114457784A (en) * | 2022-03-18 | 2022-05-10 | 汕尾市广投建设工程有限公司 | Prepressing structure of coastal sludge geological soft soil foundation and construction process thereof |
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