CN2911010Y

CN2911010Y - Fast reinforcing apparatus for blowing-filling sludge ground

Info

Publication number: CN2911010Y
Application number: CN 200620060070
Authority: CN
Inventors: 房营光; 莫海鸿
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2006-06-09
Filing date: 2006-06-09
Publication date: 2007-06-13
Anticipated expiration: 2016-06-09

Abstract

The utility model discloses a quick consolidation device of hydraulic filling clay foundation, whose characteristic comprises a sealing membrane, a drainage layer, a vacuum filter tube, a drainage plate or bagged sand well and a grid layer. The above and side of the drainage layer are covered with the sealing membrane; the grid layer is putted on the bottom of the drainage layer; the vacuum filter tube is horizontally installed in the inner drainage layer; the drainage plate or bagged sand well is vertically inserted in the new hydraulic filling soft clay laid on the original ground and the upper end is inserted in the drainage layer. Using the device to consolidate the hydraulic filling clay foundation has the advantages of short construction cycle, no mud pack, uniform strength and little differential Settlement,etc.

Description

The quick bracing means of blowing-filling sludge soil base

Technical field

The present invention relates to fields such as construction work, port works, highway engineering, specifically is the quick bracing means of blowing-filling sludge soil base.

Technical background

China's Coastal Areas is densely populated, and per capita area of cultivated farmland is very few, and along with the sustainable development of national economy, the coastal area building size constantly enlarges, and land resources is more and more nervous.In order to solve engineering problems of land utilization such as building, port and pier, ground such as PORT OF TIANJIN, Lianyun Harbour, port, Nansha, Guangzhou and Shenzhen Yantian district have carried out a large amount of reclaiming land around sea engineerings in recent years.The reclaiming land around sea engineering faces 2 problems, and the one, barged-in fill problem of materials, the 2nd, the reinforcing problem of barged-in fill ground.From the angle of technology, optimal hydraulic reclamation material is a sand, and the reinforcing technique of hydraulic fill sand ground is also simpler and easy.But, because construction work has consumed a large amount of sand, and for environmental protection and water conservancy safe requirement; various places water conservancy and environmental administration limit or forbid adopting sand, and therefore, sand costs an arm and a leg; and very shortage is difficult to satisfy the requirement of the required a large amount of hydraulic fill sand of reclaiming land around sea engineering.In recent years, in conjunction with the engineering of desilting and dredging of channel downstream or marine outfall, employing blowing-filling sludge soil bankets as reclaiming land around sea, and the siltation and the heap that have so both solved the desilting engineering are filled out the place problem, have solved the hydraulic reclamation material difficulty of reclaiming land around sea engineering again.But the silt soil water content of hydraulic reclamation is high, is in flow regime, and its compressibilty is big, intensity and bearing capacity are extremely low, must reinforce blowing-filling sludge soil base, could be the soil of reclaiming land around sea gained as construction land.

Comprise that for the reinforcing of blowing-filling sludge soil base the his-and-hers watches top blast fills out the reinforcing of silt soil and the reinforcing of weak soil for sleeping in down, the most effective reinforcement means is preloading (as vacuum method or a mound preloading etc.).The preloading consolidated subsoil need insert the plastic draining board that passes the weak soil layer or sand wick as drainage channel, and its length is decided on soft the thickness of the layer, is generally 20～25 meters, and the face of land also needs to lay the sand mat of subgrade of 600～800mm.Carrying out the board-plugging device of plastic draining board or sand wick construction or the weight of sand drain machine is 30～40 tons, and board-plugging device or sand drain machine need to walk on the face of land during construction.Because surperficial blowing-filling sludge soil is in flow regime, does not have supporting capacity, various construction equipments all will be absorbed among the blowing-filling sludge soil.Therefore, can't adopt routine techniques to carry out the construction of plastic draining board or sand wick, also can't on the blowing-filling sludge soil of the top layer of flow regime, lay sand mat of subgrade.Therefore, can't adopt existing conventional equipment that blowing-filling sludge soil base is effectively reinforced.

Summary of the invention

The objective of the invention is to problem, provide a kind of blowing-filling sludge soil base quick bracing means at the prior art existence.Adopt this device short construction period, can not form the mud bag, intensity is even, and construction back relative settlement is little.

The quick bracing means of blowing-filling sludge of the present utility model soil base by diaphragm seal, drainage blanket, vacuumize chimney filter, band drain or sand wick, grid layer constitutes, described diaphragm seal covers the top and side of drainage blanket, grid layer is in the bottom surface of drainage blanket, vacuumizing the chimney filter level is installed in the drainage blanket, band drain or sand wick are vertical to be inserted in the new hydraulically filled sludge soil that is laid on the original ground, and insert in the drainage blanket its upper end.

The present invention compared with prior art has following advantage:

1 apparatus of the present invention are adapted to the reinforcing of the mobile shape sludge soil base of new hydraulic reclamation or other super soft weak soil ground, owing to adopt blowing-filling sludge and drainage blanket, can reduce cost greatly, and help resource and ecological environmental protection;

2 adopt apparatus of the present invention to shorten the construction period.When adopting existing conventional equipment to reinforce, be absorbed in the silt soil for preventing construction equipment, blowing-filling sludge soil in top layer needs natural drying 1～2 year usually or adopts additive method to carry out preliminary treatment, and efficiency of construction is low, the cost height, and the construction period is long.And the present invention can realize reinforcing immediately, and technology is simple and easy, and cost is low, and the construction period is short.

3 the present invention can improve construction quality.When adopting existing conventional equipment to reinforce blowing-filling sludge soil base, add sand usually to improve its performance in the mud of hydraulic reclamation, form the mud bag thus easily, consolidation effect, intensity are inhomogeneous, and relative settlement is big behind the worker.The ground that adopts present technique to reinforce, consolidation effect, intensity are even, and relative settlement is little behind the worker.

Description of drawings

Fig. 1 is the quick bracing means structural representation of blowing-filling sludge of the present invention soil base.

The specific embodiment

As shown in Figure 1, diaphragm seal 1 covers the top and side of drainage blanket 2, grid layer 5 is in the bottom surface of drainage blanket 2, vacuumizing chimney filter 3 levels is installed in the drainage blanket 2, band drain or sand wick 4 vertical insertions in the new hydraulically filled sludge soil 7 that is laid on the original ground, insert in the drainage blanket 2 its upper end.

Described diaphragm seal 1 can adopt the plastic seal film, and drainage blanket can adopt one or more in straw, reed, the porous geotechnique mat of material.Grid can adopt geotextiles and/or geo-grid.

Apparatus of the present invention can be applicable to following scene, pre-reinforcing to top layer new hydraulically filled sludge soil is a kind of interim preprocessing means, its objective is to subsequent process and implement to provide condition, reinforcement process requires to simplify relatively, be several meters as the plastic draining board or the sand wick degree of depth, vacuum load is lasted and is about 7～14 days, than the plastic draining board of conventional vacuum method or the sand wick degree of depth (being generally 20～25 meters) and vacuum load last (being generally 90～120 days) require much lower.Therefore, construction cost is also much lower than the construction cost of conventional vacuum method.Reinforce its intensity of raising by top layer blowing-filling sludge soil, for the subsequent process of ground integral reinforcing implements to provide condition.Wherein the length L of plastic draining board or sand wick also is an effective reinforcement depth, requires to decide according to subsequent process, is generally several meters; Vacuum is reinforced the blowing-filling sludge soil in the effective reinforcement depth L scope in advance by chimney filter, drainage blanket and plastic draining or sand wick transmission.

The technical process of reinforcing for new hydraulically filled sludge soil base is: retaining → plastic draining board or sand wick are constructed → are drained in cofferdam → cofferdam that novel drainage blanket → laying vacuum chimney filter → laying sealed plastic film → applying vacuum load (7～14 days) → unloading → cleaning drainage blanket → laying (ground integral reinforcing) sand bedding course → employing routine techniques (such as vacuum method, preloading etc.) carries out the ground integral reinforcing for retaining → lay for blowing-filling sludge soil → lay geotextiles and/or geotechnological barrier → build.

Embodiment

The present invention has obtained successful Application in the one blowing-filling sludge soil base reinforcement experiment of area, Nansha, Guangzhou.This test site is 100 * 100m ², former ground is mud and the silt soil strata of the about 20m of thickness, at the thick mud of original place basal plane hydraulic reclamation 6m.Adopt the present invention earlier face of land new hydraulically filled sludge soil to be reinforced, through 9 days vacuum load, the bearing capacity of new hydraulically filled sludge reached 45～55kPa, had satisfied the follow-up execution conditions requirement of ground integral reinforcing, and the ground integral reinforcing still adopts vacuum method.Ground through 93 days vacuum load integral reinforcing after, bearing capacity reaches 90kPa, meets design requirement.

Claims

1, the quick bracing means of a kind of blowing-filling sludge soil base, it is characterized in that by diaphragm seal, drainage blanket, vacuumize chimney filter, band drain or sand wick, grid layer constitutes, described diaphragm seal covers the top and side of drainage blanket, grid layer is in the bottom surface of drainage blanket, vacuumizing the chimney filter level is installed in the drainage blanket, band drain or sand wick are vertical to be inserted in the new hydraulically filled sludge soil that is laid on the original ground, and insert in the drainage blanket its upper end.

2, device according to claim 1 is characterized in that described drainage blanket comprises one or more in straw, reed, weeds, the porous geotechnique mat of material.

3, device according to claim 1 and 2 is characterized in that described diaphragm seal is the plastic seal film.

4, device according to claim 3 is characterized in that described grid is geotextiles and/or geo-grid.