CN101806057B - Immediate processing method for hydraulic fill of ultra-soft foundation by modified vacuum preloading and water-covering preloading - Google Patents
Immediate processing method for hydraulic fill of ultra-soft foundation by modified vacuum preloading and water-covering preloading Download PDFInfo
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- CN101806057B CN101806057B CN201010158412XA CN201010158412A CN101806057B CN 101806057 B CN101806057 B CN 101806057B CN 201010158412X A CN201010158412X A CN 201010158412XA CN 201010158412 A CN201010158412 A CN 201010158412A CN 101806057 B CN101806057 B CN 101806057B
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Abstract
The invention relates to an immediate processing method for hydraulic filling an ultra-soft foundation by modified vacuum preloading and water-covering preloading. The technical proposal of the invention comprises the following steps of: building a float bridge on a mud area in a causeway, laying a plastic woven cloth on the mud area, fixing the plastic woven cloth on the causeway and the float bridge, horizontally laying a water discharge branch pipe on the plastic woven cloth, inserting a plastic water discharge board around the water discharge branch pipe in the mud of the mud area, horizontally laying a water discharge main pipe on the plastic woven cloth in the direction perpendicular to the water discharge branch pipe, connecting one end of the water discharge main pipe to a vacuum pump, laying a geotextile on the water discharge main pipe and the water discharge branch pipe, laying a vacuum film on the geotextile, and arranging a water load on the vacuum film. The invention solves the technical problems of unenforceable construction existing in the traditional vacuum preloading foundation treatment method, and has the advantages of simple process, convenient construction and lowered cost. Besides, after the hydraulic filling of the foundation is completed, the foundation can be immediately processed, thereby greatly shortening the foundation processing period, and ensuring that the invention is a very economical and practical soft foundation processing method.
Description
Technical field
The present invention relates to a kind of method for processing foundation, particularly a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed combines the water covering prepressing immediate processing method.
Background technology
In recent years, the construction land deficiency has become and has restricted the particularly bottleneck of coastal area economy and social development, so the coastal area engineering of reclaiming fields from the sea on a large scale.But the geological condition of reclaiming fields from the sea is complicated, and it is zero that new hydraulic reclamation mud mainly shows as mud content height, poor permeability, intensity, is in the ultra-soft state, and personnel and construction machinery can't directly get into the place.
Before the present invention, often adopt vacuum preloading to carry out consolidation process for mud matter soft foundation, make it to have certain intensity.Method is to adopt machinery to plug plastic draining board earlier, re-lays sand cushion as the horizontal drainage system, lays geotextiles again, lays work such as vacuum diaphragm and layout vacuum pump, and these are all realized on land-based area.But for the hydraulic reclamation ultra-soft foundation, foundation soil strength is zero, in fact is in flow regime, is similar on the waters and constructs, and the traditional vacuum precompressed can't be implemented at all.Particularly, there is following shortcoming in traditional vacuum prepressing ground foundation treatment method:
(1) for the hydraulic reclamation mud of ultra-soft state because construction machinery can't be marched into the arena, therefore can't set plastic draining board, also can't lay the horizontal drainage sand cushion, this limitations restrict the application of traditional vacuum precompressed.
(2) some places lack the sand source; The price of sand constantly raises up, though and plastic draining blind pipe and three-dimensional composite drainage network have come out, but cost is too high; The large-area construction construction costs is difficult to bear, and the difficulty that same existence can't be constructed for ultra-soft foundation exists.
(3) conventional process worker method construction and cycle of handling long, this can influence programming to a great extent.
(4) in the traditional vacuum precompressed, take PVC pipe and pipe with holes as drain header and branch drain; PVC thick-walled tube cavity is big, and rigidity is very much not yielding, but every pipe length is merely 6m; Therefore joint is a lot; It is slow that the joint amount too much can be brought tube head connection operation when on ultra-soft foundation, constructing, and quality of connection is not good, and can cause splice failure when differential settlement.
Summary of the invention
The object of the invention just is to overcome above-mentioned defective, proposes a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed and combines the water covering prepressing immediate processing method.
Technical scheme of the present invention is:
A kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed combines the water covering prepressing immediate processing method, comprises laying pontoon bridge, modified vacuum precompressed, and combines the water covering prepressing technology, mainly comprises following technical step:
(1) lays pontoon bridge in the mud district in embankment;
(2) in the mud district, lay plastic woven cloth, be fixed on embankment and the pontoon bridge;
(3) level is laid branch drain on plastic woven cloth, and plastic draining board inserts in the mud in mud district around branch drain;
(4) level is laid drain header on plastic woven cloth, moves towards vertical with branch drain, and drain header one end connects vacuum pump;
(5) drain header, with branch drain on lay geotextiles, on geotextiles, lay vacuum diaphragm;
(6) on vacuum diaphragm, place water ballast(ing).
Advantage of the present invention and effect are:
(1) pontoon bridge is an operation platform on the mud of the present invention, provide convenience for personnel and materials arrival, and be again the fixed support of plastic woven cloth, and the shop geotextiles is during with the shop vacuum diaphragm, personnel can stand on the pontoon bridge and to constructor and material traction are provided;
(2) rubbery foam plate of the present invention is the beformable body material, and buoyancy is big; Bamboo offset plate intensity is high, good rigidly; On the rubbery foam plate, lay two-layer bamboo offset plate, hard and soft combination, the bamboo offset plate can play and be uniformly distributed with rubbery foam plate upward pressure when load-bearing; Improve the integral rigidity and the stability of pontoon bridge; Avoid rubbery foam plate local distortion excessive, the generation of the phenomenon that is prone on every side to dig makes pontoon bridge have the characteristics of good planeness and good stability.
(3) the present invention lays the plastic woven cloth of one deck porous on hydraulic reclamation mud, and plastic woven cloth is a loaded filter, stops that fine particle gets into the horizontal drainage system on it in the mud.
(4) after being fixed on plastic woven cloth on the column of pontoon bridge on embankment and the mud, the kickboard that plate personnel and transport of materials are used can move on woven cloth easily; When the constructor walked on plastic woven cloth, as safe as a house though both legs have certain being absorbed in as inflatable life cushion, personnel can carry out construction operation easily on plastic knitting.
(5) the present invention has cancelled sand cushion, adopts novel horizontal drainage system to quicken the discharging consolidation of ultra-soft foundation, compares with sand cushion, has practiced thrift a large amount of sand sources, has practiced thrift construction costs greatly; And sand operation on can't carrying out on the ultra-soft foundation, the density of sand is native bigger than ultra-soft, also can sink in the mud even sand has been spread on the surface.In area in short supply, sand source, even there are not enough sand sources to supply the hydraulic reclamation ultra-soft foundation to handle use at all.
(6) the present invention adopt diameter 63mm or 50mm the ripple chimney filter as drain header under the film and branch drain, with the common novel horizontal drainage system that forms of two-layer geotextiles, can guarantee the efficient transfer of vacuum; The ripple chimney filter belongs to half firm half beformable body material, and its rigidity can satisfy the requirement of transmitting negative pressure, and its flexibility and retractility have the ability that can adapt to the place inhomogeneous deformation simultaneously.The every dish length of ripple chimney filter can be 200m when dispatching from the factory, can be in the place and intercepting arbitrarily according to each row drain header or branch drain length, and a lot of joints are saved in the centre, have improved operating efficiency.
(7), adopts plastic draining board the loose winding method of nature when being connected with branch drain; The 20cm horizontal segment is set during connection; Twine the opposite side that branch drain after one week inserts the plastic draining board of residue length branch drain loosely, form the vertical drainage system that one is long and the other is short.
(8) the described 20cm of setting horizontal segment can increase the contact area of plastic draining board and branch drain and horizontal drainage system, increases the transmission effect of vacuum under the film.Because in the hydraulic reclamation ultra-soft foundation; Particle is tiny; Always have the outsourcing filter membrane that small quantities of particles passes plastic draining board and get in the cavity, to such an extent as to and move up and get into the horizontal drainage system, certain horizontal segment is set after; Contact area enlarges markedly, and has got into tiny soil particle in the plastic draining board cavity and has been unlikely to concentrate on certain complete clogging a bit takes place.
(9) after drain header is vacuumized; Can form with the plastic draining board is " earth pillar " at center, and " earth pillar " overhead height is higher than surrounding soil, if branch drain then can form waveform just on branch drain; Thereby be stowed and turn round and drag, drainability can obviously weaken.Plastic draining board when twining is if be provided with horizontal segment; Then branch drain moves between two rows' " earth pillar " in fact just; Cause inhomogeneous deformation even vacuumize, then branch drain is totally comparatively mild, has also alleviated earth pillar drawing and turning round and drag phenomenon branch drain.
(10) the present invention adopts modified vacuum precompressed and water covering prepressing to unite ground is produced the precompressed effect; Covering hydraulic pressure water is water-retaining cofferdam (or combine existing embankment) is set on film; Carry out the film overlying water, can increase prefabricating load on the film after covering water, accelerate the rate of consolidation of the soil body.The vacuum preloading of ultra-soft foundation was generally 3-4 month, during the sun tan by the sun with strong wind very greatly to the erosion of vacuum diaphragm, so vacuum diaphragm easy ageing and breakage can significantly be protected vacuum diaphragm behind the water covering prepressing, prevent and slow down the aging and damaged of vacuum diaphragm.
(12) though on the mud of the present invention exploitation materials such as rubbery foam plate, bamboo offset plate, ripple chimney filter, plastic woven cloth for being applied to the ground processing first; But material requested can be bought on market; Need not to develop separately again and customize; Therefore, not only material cost can be do not increased, Master Cost can be reduced greatly yet.
(13) the present invention has realized that can carry out ground immediately after hydraulic fill foundation is accomplished handles; And treatment effect is better; Can carry out the construction of marching into the arena of town road construction and enterprise immediately; Saved 8-12 month ground processing time, therefore, the present invention has saved valuable time for building early to go into operation the morning of enterprise.
In a word, method of the present invention has solved the technical barrier that the traditional vacuum precompressed can't be implemented on ultra-soft foundation, and technology is simple; Easy construction; Reduced cost, and after the hydraulic fill foundation completion, can carry out ground immediately and handle; Having shortened the ground treatment construction phase greatly, is a kind of very economical and practical soft base processing method.
Other advantages of the present invention and effect will continue explanation below.
Description of drawings
Fig. 1---hydraulic reclamation ultra-soft foundation layout plan among the present invention.
Fig. 2---pontoon bridge sketch map on the mud of the present invention.
Fig. 3---modified vacuum precompressed of the present invention combines to cover the water generalized section.
Fig. 4---modified vacuum precompressed floor map of the present invention.
The 1-embankment; The 2-pontoon bridge; 3-rubbery foam plate; The 4-column; 5-bamboo offset plate; The 6-railing; The 7-plastic woven cloth; The 8-branch drain; The 9-plastic draining board; The 10-geotextiles; The 11-vacuum diaphragm; The 12-water ballast(ing); The 13-drain header; The 14-vacuum pump.
The specific embodiment
Like Fig. 1,2, shown in 3 and 4:
(1) according to the position of ground processing region shape size and embankment 1, measure unwrapping wire, planning mud extraction float bridge 2 position and each processing region (A among Fig. 1, B, C ...) the position, each is handled zone subdivision and becomes some vacuum preloading blocks;
(2) begin to spread pontoon bridge 2 on the mud from an end of reinforcing the place, lie in rubbery foam plate 3 on the hydraulic reclamation mud earlier, join end to end;
(3) circular hole of 2 diameter 2cm is bored at every rubbery foam plate 3 two ends, and the circular hole of two blocks of adjacent rubbery foam plates 3 before and after wearing with rope connects all rubbery foam plates 3 head and the tail in order;
(4) set four mao bamboon bars as column 4 every rubbery foam plate 3 both sides, the lower end is passed hydraulic reclamation thickness and is gone into hardpan 50cm, and mud face 100cm is exposed in the upper end;
(5) set the circular hole of diameter 2cm near near column 4 at rubbery foam plate 3, rubbery foam plate 3 is fixed on the column 4 with rope; When the mud face changes, can regulate the height of lanyard;
(6) the two-layer bamboo offset plate 5 in shop on rubbery foam plate 3, every block of bamboo offset plate of lower floor 5 connects two blocks of rubbery foam plates 3; Two blocks of bamboo offset plates 5 below every block of bamboo offset plate in upper strata 5 connects.Rubbery foam plate 3 forms meshing structure with two-layer bamboo offset plate 5;
(7) pontoon bridge 2 left and right sides two root posts, 4 usefulness iron wires side by side are close to connection above the bamboo offset plate 5, to increase the stability of pontoon bridge 2.Equally can be according to the position of the height adjustment iron wire of mud face; Above bamboo offset plate 5, be adjacent to the column 4 that bamboo offset plate 5 connects pontoon bridge 2 the right and lefts, rubbery foam plate 3 and bamboo offset plate 5 were fixed between mud face and the iron wire by " tightly ", improve the stability of pontoon bridge 2 as far as possible with iron wire.When face of land SEA LEVEL VARIATION or surface subsidence cause pontoon bridge 2 to fluctuate, should in time regulate the position of iron wire.
(8) on the column 4 of pontoon bridge 2 both sides, railing 6 is set respectively;
(9) plastic woven cloth 7 is processed; Plastic woven cloth 7 porous (the colour bar Polypropylence Sheet of non-not porous), the breadth that dispatches from the factory is 4m, needs according to the place size woven cloth to be spliced in advance; Sew up twice in the breadth junction with portable sewing machine, form and be slightly larger than the area of reinforcing block.
(10) plastic woven cloth 7 is slowly launched at the mud face, four limits or relative at least both sides are fixed on embankment 1 or the column 4.After fixing, woven cloth is thrown the net as one.Plastic woven cloth 7 effects have two: one, as loaded filter, can stop that fine particle gets into the horizontal drainage system in the mud; The 2nd, under the effect of plastic woven cloth 7 tension force, personnel and material can walk on plastic woven cloth and transport;
(11) with the kickboard of rubbery foam plate 3 and bamboo offset plate 5 area 2m * 2m customized; Kickboard supplies the plate operating personnel use of on mud, walking; And in the middle of the place, transport materials such as branch drain 8 and plastic draining board 9, kickboard can or lean on two tractions of long rope on embankment 1 or pontoon bridge 2 mobile on plastic woven cloth 7 easily from boat.
(12) branch drain 8 is set earlier by a determining deviation, its spacing is the array pitch of plastic draining board 9;
(13) construction area is carried out plastic draining board 9 examinations and insert, confirm plastic draining board 9 construction depths, be as the criterion to penetrate mud when examination is inserted, come intercepting plastic draining board 9 according to construction depth, upper end length in reserve; And plastic draining board 9 two ends are processed, processing method is upwards to dig 5cm at the filter membrane of plastic draining board 9 bottoms, cuts 3cm to the muscle core with scissors, and then the filter membrane of digging is turned down.Folding the filter membrane wall back that is close together to a side, the muscle core is twisted in the inside fully, with stapler the bottom stickfast.The other end is also done same processing.
(14) position that plugs to plastic draining board 9 positions; Apart from the place of branch drain 8 about 20cm, with blade plastic woven cloth 7 to be scratched, aperture length is slightly larger than plastic draining board 9 width; The aperture must guard against excessive, in case mud gets in the horizontal drainage system on upper strata from the aperture.
(15) with the slightly folding 10cm in plastic draining board 9 lower ends, aim at the aperture of scratching, at the uniform velocity vertically insert in the mud, be inserted into hydraulic reclamation mud bottom with artificial plate device; When pulling out on the plate device, suitably pull out in the rotation more earlier, in case plastic draining board 9 is rewinded.
(16) to inserting the good remaining length in plastic draining board 9 upper ends; Paste ground placement 20cm earlier and form certain horizontal segment 10, twined for 1 week from the top down to contiguous branch drain 8 places, the diameter of winding is greater than 1.5-2 times of branch drain 8 diameters; Naturally twine, avoid locking.Again the short slab part 11 of remainder is inserted in the opposite side mud, formed the vertical drainage system of a long slab one short slab, to increase the transmission of vacuum.
(17) perpendicular to branch drain 8 directions, arrange drain header 13, spacing is 10～15m, and drain header 13 is connected with branch drain 8 usefulness threeways or four-way.Drain header 13 sets out fenestra at the membrane place, so that vacuum pump 14 connects.
(18) lay two-layer 180g/m
2Geotextiles 10, because plastic woven cloth 7 has very big tension force, be absorbed in can walking freely though people's this moment can walk in the above, does not have the danger that is absorbed in.The geotextiles 10 of whole volume lifted marches into the arena, during laying from the several constructors of an end that the handle block geotextiles 10 of overturning side by side, simultaneously in block other end traction geotextiles 10.
(19) the two-layer vacuum diaphragm 11 in shop is polyethylene sheeting, and thick 0.14mm, laying method be with geotextiles 10, but will note protecting vacuum diaphragm 11, avoids being torn.
(20) because the hydraulic reclamation ultra-soft foundation is in flow regime, need not dig the sealing ditch, only need to play sealing effectiveness stepping at least below the 1.5m degree of depth around the vacuum diaphragm 11.Before stepping on film, unclamp the limit that is fixed of plastic woven cloth 7 earlier, all be wrapped within the diaphragm seal plastic woven cloth of lower floor 7 and geotextiles 10 after press mold again.During press mold, should fully stir the mud of boundary, guarantee vacuum diaphragm 11 border seal effects.
(21) vacuum pump 14 equal vacuum drainage systems are installed, are circulated and open 30% vacuum pump 14, examination vacuumized (taking out slowly) 15 days, and whether inspection leaks gas is strengthened the vacuum maintenance; Examination is avoided loading too fast when taking out, necessary circulation turn on pump is to avoid the plastic draining board 9 too fast fixed and stifled resistance hole of soil on every side.
(22) after examination vacuumizes 15 days, progressively open all vacuum pumps 14, formally load at full capacity, require under the film vacuum, when not reaching vacuum and require, must take to add the pump measure and check the sealing situation more than or equal to 80kPa.
(23) beginning film overlying water 50-100cm to increase precompressed water ballast(ing) 12, prevents that vacuum diaphragm 11 is tanned by the sun with strong wind by the sun and corroded delaying aging.
(24) carry out each item field monitoring, draw sedimentation-time curve, treat that settlement stability meets unloading condition after, removal vacuum load is removed pumped vacuum systems.
Pontoon bridge is made up of column, rubbery foam plate and bamboo offset plate on the described mud.The material of rubbery foam plate is a polyethylene foam sheet, and light weight buoyancy is big, and belongs to elastic material, has very strong toughness and intensity, and is anti-dilatory and anti-knife wound ability is strong, thickness 5～8cm, and monolithic is of a size of 1.2m * 2.4m, and monolithic weight is 10～15kg.Column is arranged on the both sides of rubbery foam plate, after the horizontal level of rubbery foam plate is fixed, double swerve does not take place.Column adopts mao bamboon bar (or steel pipe), and the lower end is passed hydraulic reclamation thickness and got into hardpan, and stretch out about mud face 1m the upper end.
Pontoon bridge is an operation platform on the described mud, is again the fixed support of plastic woven cloth, and when shop geotextiles and shop film, personnel can stand on the pontoon bridge and to shop cloth shop film constructor and material traction are provided.
Described modified vacuum precompressed adopts plastic woven cloth as loaded filter, and to the anti-stifled processing of becoming silted up of plastic draining board, and ripple chimney filter and geotextiles are formed novel horizontal drainage system.
Described branch drain and drain header are the ripple chimney filter of overcoat filter membrane.
Claims (5)
1. a hydraulic reclamation ultra-soft foundation modified vacuum precompressed combines the water covering prepressing immediate processing method, comprises and lays pontoon bridge, modified vacuum precompressed, and combine the water covering prepressing technology, mainly comprises following technical step:
(1) lays pontoon bridge in the mud district in embankment;
(2) in the mud district, lay plastic woven cloth, be fixed on embankment and the pontoon bridge;
(3) level is laid branch drain on plastic woven cloth, and plastic draining board twines in the mud in branch drain insertion mud district;
(4) level is laid drain header on plastic woven cloth, moves towards vertical with branch drain, and drain header one end connects vacuum pump;
(5) on drain header and branch drain, lay geotextiles, on geotextiles, lay vacuum diaphragm;
(6) on vacuum diaphragm, place water ballast(ing).
2. a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed according to claim 1 combines the water covering prepressing immediate processing method; It is characterized in that pontoon bridge is made up of rubbery foam plate, column; The rubbery foam plate is laid on the mud in mud district; Column is arranged on around the rubbery foam plate, and column lower end gets into pan soil, and the upper end is higher than mud.
3. a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed according to claim 2 combines the water covering prepressing immediate processing method, it is characterized in that the bamboo offset plate is laid on the rubbery foam plate and connection.
4. combine the water covering prepressing immediate processing method according to the described a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed of claim 1, it is characterized in that drain header, branch drain, form the horizontal drainage system jointly with geotextiles.
5. a kind of hydraulic reclamation ultra-soft foundation modified vacuum precompressed according to claim 1 combines the water covering prepressing immediate processing method, it is characterized in that the earlier slow pump drainage water person in charge, and vacuum is slowly risen, and the plastic draining board surrounding soil is fixed in order.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296590A (en) * | 2011-06-09 | 2011-12-28 | 宁波高新区围海工程技术开发有限公司 | High-strength reinforcing method of supersoft foundation |
| CN102704458A (en) * | 2012-06-27 | 2012-10-03 | 河海大学 | Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground |
| CN104746506A (en) * | 2013-12-30 | 2015-07-01 | 深圳市工勘岩土工程有限公司 | Soft soil combined preloading structure and construction method |
| CN104005401A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Vacuum preloading solidification drainage channel |
| CN104775414B (en) * | 2015-03-24 | 2017-05-03 | 华中科技大学 | Super-soft dredger fill surface layer solidification crusting and foundation treatment method |
| CN109403305A (en) * | 2018-10-19 | 2019-03-01 | 杭州永创基建工程科技股份有限公司 | A kind of compacted modified enhancing processing method of the discharging consolidation soil body joint soil body of mechanical compression |
| 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 |
| CN112921995A (en) * | 2021-02-26 | 2021-06-08 | 三峡大学 | Pre-pressure drainage system and method for reservoir bank slope soil filling area by reservoir water pressure |
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