CN1061823A

CN1061823A - Fast drying and consolidating method with vacuum precompression for blown soil fill

Info

Publication number: CN1061823A
Application number: CN 91111663
Authority: CN
Inventors: 曹大正
Original assignee: TIANJIN WATER CONSERVANCY INST
Current assignee: TIANJIN WATER CONSERVANCY INST
Priority date: 1991-12-21
Filing date: 1991-12-21
Publication date: 1992-06-10
Anticipated expiration: 2006-12-21
Also published as: CN1020938C

Abstract

Barged-in fill vacuum preloading drainage concretion method relates to a kind of vacuum preloading that utilizes makes hydraulic reclamation epeirogenetic mud force to release the process of water, quick drainage, construct the cofferdam around in the hydraulic reclamation pond, the pre-buried level in face of land gravity flow filter pipe net and construct the sealing collecting well in the cofferdam at the tail end of pipe network, adopt jet pump by the exhaust of drawing water of sealing collecting well, make and cause negative pressure in the filter pipe net, force the hydraulic reclamation soil body in filter pipe net, to release water.Easy construction of the present invention, drainage speed are fast, and the drainage energy consumption is little, processing area is big, and can prolonged and repeatedly be used for the epeirogenetic of drip washing barged-in fill, so be particularly suitable for quick drainage hydraulic reclamation epeirogenetic mud.

Description

Fast drying and consolidating method with vacuum precompression for blown soil fill

The present invention relates to a kind of vacuum preloading that utilizes makes river course, river mouth or bay hydraulic reclamation epeirogenetic mud force to release the fixed method of water.

In the desilting engineering in river course, river mouth or bay or in the blowing-filling sludge epeirogenetic engineering, the drainage of blowing-filling sludge is fixed to be a great problem.For follow-up engineering is normally carried out, must make the hydraulic reclamation soil layer reach at least load bearing requirements.Therefore, the fixed cycle of hydraulic reclamation soil layer will make a big impact to the cycle of whole engineering, as adopting natural air drying, then needing just to make in 200 days the hydraulic reclamation soil layer to reach at least requirement at least, whole construction period was extended greatly.Fixed for the drainage that quickens soft base, the method for multiple acceleration concretion of soft foundation once appearred.After the World War II, on the basis of Tai Shaji theory of consolidation, tens of kinds of concretion of soft foundation technology such as prefabricating load, lime pile, pellicle, sand drain have appearred successively.Nineteen fifty-two, after W.Kjeuman has proposed the vacuum preloading new technology, concretion of soft foundation technology such as sand drain vacuum preloading and plastics sheet pile vacuum preloading have appearred successively again.So-called vacuum preloading is to dig the drainage sand drain or squeeze into drainage plastics sheet pile in soft base, adopt jet pump or adopt the exhaust of drawing water of centrifugal pump and vacuum pump, make in sand drain or the plastics sheet pile and cause negative pressure, soft base promptly forces to release the water drainage in the drainage sand drain or in the drainage plastics sheet pile under suction function.Because the drainage sand drain is vertical the cutting, drainage plastics sheet pile is also vertically squeezed into, so just catchment and drainage pattern, above-mentioned technique of soft soil foundation treatment belongs to vertical and catchments and vertical draining.This vertical catchment and the outstanding defective of the vacuum preconsolidation technology of vertical draining is to construct very difficultly, especially when surface layer was blowing-filling sludge, working pile driver or board-plugging device can't enter the scene, so be unsuitable for the large tracts of land treatment of soft foundation.In addition, because vertical drainage needs to consume a large amount of negative pressure energy.In recent years, the vacuum preconsolidation technology that level is catchmented occurred, the clear and disclosed technique of soft soil foundation treatment of 60-40410 Japan Patent promptly belongs to this type of.This patented technology has been owing to adopted the water filter plate of horizontal laying, thus relatively be suitable for the large tracts of land treatment of soft foundation, but owing to still adopting vertical draining, so energy consumption is still very high.And need to adopt special-purpose flatboat that water filter plate is installed, and the construction more complicated, water filter plate and vacuum tube need to draw ground through encapsulation process, have more increased the difficulty of construction.

The objective of the invention is to obtain a kind of easy construction, energy consumption is low, drainage is fast, be suitable for handling the quick drainage concretion method of vacuum preloading of large tracts of land hydraulic reclamation epeirogenetic mud.

To achieve these goals, the present invention combines technique of soft soil foundation treatment with the farmland hidden tube drainage technology, around the hydraulic reclamation pond, construct the cofferdam, the pre-buried gravity flow filter pipe net in the face of land and construct the sealing collecting well in the cofferdam at the tail end of pipe network, adopt jet pump or adopt centrifugal pump and vacuum pump by the exhaust of drawing water of sealing collecting well, make and cause negative pressure in the filter pipe net, force the hydraulic reclamation soil body in filter pipe net, to release water, the water that enters in the filter pipe net is discharged outside the well from inflow sealing collecting well and through jet pump or centrifugal pump, thereby makes the quick drainage of blowing-filling sludge fixed.Be described in further detail below in conjunction with the technical characterictic of specific embodiment fast drying and consolidating method with vacuum precompression for blown soil fill of the present invention.

Accompanying drawing 1 and accompanying drawing 2 are respectively the vertical view and the sectional view of filter pipe net and sealing collecting well.

With reference to the accompanying drawings 1 and accompanying drawing 2, the gravity flow filter pipe net that is embedded in the face of land in the cofferdam, hydraulic reclamation pond among the present invention is to be made of first-level pipeline network that interconnects and secondary pipeline.Secondary pipeline 1 is a pipe of cement, and its length is no more than 300m, and longitudinal gradient falls more than or equal to 1/1000, and the pipe tail is communicated with sealing collecting well 2.Be arranged in parallel forms first-level pipeline network 3 by many ripple filter pipes (being the farmland closed drain), be positioned at the top of secondary pipeline 1 both sides and evenly distribute along secondary pipeline 1 total length, its spacing is 4～5m, single tube length is no more than 100m, longitudinal gradient with respect to secondary pipeline 1 reduces to 1/1000～1/750, employing threeway 4 is pegged graft with secondary pipeline 1 Durchgangshohle, swathes non-woven geotextile and enclose outside the pipe to be filled with sand filter blanket 5.Sealing collecting well 2 is constructed in the inboard in cofferdam, hydraulic reclamation pond 6, and the lowest part that its shaft bottom is lower than filter pipe net is the pipe tail of secondary pipeline 1, and the shaft bottom also has the pump sump mouth that connects water pump 7, and well head exceeds cofferdam 6 and is provided with outlet valve 8.

Filter pipe net among the present invention is owing to be to be embedded in surface layer in the cofferdam, so construction easily, without any need for large-scale special equipment, ripple filter pipe in the first-level pipeline network can form the water seal layer after swathing non-woven geotextile and enclosing the back-up sand filtering layer, need not that first-level pipeline network is carried out any special seal processing and can make the negative pressure that causes 0.07MMPa in the pipe network.The water of releasing that enters in the filter pipe net seals collecting well from flowing into, and has saved a large amount of negative pressure energy, has reduced energy consumption.Drainage speed of the present invention is fast, and with bay fine grained soils hydraulic reclamation, through sewer drainage in 60 days, soil moisture content can reduce to 36% by 107%, and the degree of consolidation can reach more than 90%, and after drainage was fixed, filter pipe net and sealing collecting well also can prolonged and repeatedly be used for the epeirogenetic of drip washing hydraulic reclamation.Therefore, the present invention is specially adapted to quick drainage large tracts of land hydraulic reclamation epeirogenetic mud.

Claims

1, a kind of vacuum preloading that utilizes makes the river course, river mouth or bay hydraulic reclamation epeirogenetic mud force to release water, the barged-in fill vacuum preloading drainage concretion method of quick drainage, construct the cofferdam around it is characterized in that in the hydraulic reclamation pond, the pre-buried gravity flow filter pipe net in the face of land and construct the sealing collecting well in the cofferdam at the tail end of pipe network, adopt jet pump or adopt centrifugal pump and vacuum pump by the exhaust of drawing water of sealing collecting well, make and cause negative pressure in the filter pipe net, force the hydraulic reclamation soil body to release water in filter pipe net, the water that enters in the filter pipe net is discharged outside the well from inflow sealing collecting well and through jet pump or centrifugal pump.

2, barged-in fill vacuum preloading drainage concretion method according to claim 1 is characterized in that described gravity flow filter pipe net is made up of the secondary pipeline and the first-level pipeline network that interconnect; Described secondary pipeline is a pipe of cement, its length is no more than 300m, longitudinal gradient falls more than or equal to 1/1000, and the pipe tail is communicated with the sealing collecting well, and described first-level pipeline network is arranged in parallel by many ripple filter pipes and forms, be positioned at the top of secondary insides of pipes and evenly distribute along secondary pipeline total length, its spacing is 4～5 meters, and single tube length is no more than 100m, reduces to 1/1000～1/750 with respect to the longitudinal gradient of secondary pipeline, adopt threeway and secondary pipeline Durchgangshohle to peg graft, pipe is outer to be swathed non-woven geotextile and encloses the back-up sand filtering layer.

3, barged-in fill vacuum preloading drainage concretion method according to claim 1, it is characterized in that described sealing collecting well constructs in inboard, cofferdam, hydraulic reclamation pond, its shaft bottom is lower than filter pipe net diode deferent tail and is provided with the pump sump mouth, and its well head is higher than the cofferdam and is provided with outlet valve.