CN2519819Y - Solidified foundation with horizontal water drainage board - Google Patents

Abstract

Disclosed is a level drainage plate strengthening foundation which is a drainage plate being arranged between silt layers. The character is that the drainage plate is levelly laid. The core idea of the design is levelly laying the drainage plate of the foundation, which is originally vertically laid. The excess hydrostatic pore water pressure which is originally harmful to the structure of the foundation can be changed to the drive of the drainage by the effect of vibration and rolling, which can reduce the void ratio and achieve the aim of compacting the soil body. The structure of the foundation can successfully drain and can achieve the quality of the traditional foundation. The characteristic is that (1). The utility model saves the working procedure of the vertical inserting plate and thus the price is cheaper. (2). A heap load is replaced by a vibration mill, which removes the heap load construction. (3). The utility model saves the foundation treating time, which can make the fill construction and the foundation treatment being completed synchronously and can produce large economic benefit. The level drainage plate strengthening foundation is mainly fit for the hydraulic fill foundation which has no relatively large concentrated load of large area and has middle and small load such as yard, road and ash storage field of civil engineering of port, power plant, etc.

Description

The horizontal draining board consolidated subsoil

Technical field

The utility model relates to a kind of horizontal draining board consolidated subsoil.

Background technology

In hydraulic engineering construction, often a large amount of silts that engineering is dug out blow to the place that needs landfill with waterpower, make it to form new ground, also can form the ground that hydraulic reclamation silt constitutes in enclosing and cultivating the engineering of making ground.But contain large quantity of moisture in the silt after the hydraulic reclamation, quality is too soft, need discharge moisture wherein and could form ground.Some natural subgrades also contain large quantity of moisture, and the ground that forms with hydraulic reclamation is the same to need draining to handle.Prior art is handled vertical drainage plate preloading commonly used in the saturated dredger soft soil, band drain promptly vertically is set in silt, and applies mechanical oscillation on silt, and moisture is oozed out from band drain gradually, forms solid ground.This traditional method that plastic draining board is set is to beat in the finally top application of pending ground, and vertical the layout, needs through very long squeeze time though its price is low.This handle to be very suitable to natural soft base or the ground of having finished embankment.But to enclosing and cultivating the hydraulic reclamation material of making ground, this method may not very wise move.Compacting is a kind of surface layer logos, and is very economical and effective to the viscosity filled ground, adds and also can be used for the responsive sand that liquefies after the vibration.The band drain preloading is a kind of pre-loading consolidation, and to saturated soil ground not only economy but also effective, cost is also low, and it just is used in the soft foundation unfortunately, and is the vertical drainage plate.The common deficiency of above method is: (1) all will just can carry out ground and handle after hydraulic reclamation is finished; (2) to construct with special machinery; (3) need the very long duration.Abroad in the strong rammer and vacuum preloading processing of filler, used horizontal perforated pipe to come draining: in order to reduce the workload after embankment is constructed, Canada is the porose plastic pipe of horizontal positioned diameter 100mm, spacing 7m in filler once, the passing away of filler mesopore water during as strong the rammer is to flow into sump; Thevanayagam even also imagine hydraulic reclamation material land and under water all adopts horizontal drainage layer and vertical row well combined vacuum preloading method, does not just implement.Commonly used both at home and abroad is to lay sand cushion or sand furrow on the face of land as the horizontal drainage layer, and it is also unprecedented really horizontal draining board to be used for actual foundation treatment engineering, the precedent that more horizontal plastic draining board is combined with the vibrating roller platen press.

Summary of the invention

The utility model will provide a kind of waterpower hydraulic fill foundation of new construction.The foundation drainage of this kind structure is smooth, can meet or exceed the quality of traditional ground.This scheme shortens the path of oozing out of super quiet pore water in the soil with band drain; Apply prefabricating load on the one hand with vibrating roller, produce bigger circulation shear stress on the one hand, make the local liquefaction of top layer sand, form super quiet pore water, discharge through the band drain and the face of land, the soil body is by densification.Horizontal draining board adds vibroroller cmpacting, integrated application shear stress, vibrational energy and drainage system, it mainly contains three aspects to the effect of hydraulic reclamation fine sand soil: static(al) compacting, vibratory compaction, draining decompression.In addition, the band drain of horizontal positioned even without prefabricating load, still can play good natural drainage effect, encrypts ground.It can just implement Measures for Making Ground and Foundation in hydraulic reclamation silt, can be base molded in advance significantly and the time of using, and reduce the difficulty of construction.

The scheme of finishing the foregoing invention task is: the waterpower hydraulic fill foundation, between the silt layer, be provided with band drain, and it is characterized in that: band drain is that level is laid.Here said band drain can adopt the band drain in the prior art vertical drainage plate preloading, just changes into being horizontally disposed with.The layout of band drain and spacing will be according to barged-in fill type, vibrating roller sizes, roll number of times, handle the combined factors such as target that the back requires to reach and determine: to coarse sand soil pitch arrangement greatly; To fine sand, silt and weak soil, little pitch arrangement, even every layer of two-way interlaced arrangement improves draining compaction.In saturated sand, lay horizontal draining board, purpose is the artificial horizontal drainage relief passage that forms permeate well in ground, acceleration increases the discharge rate of pore water between discrete particles because of the excess pore water pressure that part liquefaction produces dissipates, and improves the densification degree.Its referential data is: the thickness of the layer is 0.5～2 meter between the two-layer band drain, and the lateral separation between the band drain is 1～3 meter, can be blossom type or arranged in squares between each layer band drain.The core concept of the technical program is: 1, change the original vertical band drain that uses in the ground into horizontal positioned; 2, " in vertical setting in the final face of land of pending ground and injection " can be changed into setting and injection simultaneously in the process of hydraulic reclamation like this.Under the effect of vibroroller cmpacting, make originally the power that has become draining is pressed in the disadvantageous super quiet hole of ground, thereby reduce void ratio, reach the purpose of encrypting the soil body.Applying and number of rolling of vibroroller cmpacting.To hydraulic reclamation powder fine sand, behind the general hydraulic reclamation about 10 days, just can bear large-scale vibrating and roll.To saturated dredger soft soil, use light-duty vibrating roller, even can not apply vibroroller cmpacting, and only utilize the pre-compression functions of deadweight of the natural drainage function of horizontal draining board and follow-up embankment and encrypt ground.Number of rolling will be determined according to the reinforcement degree of ground, generally can adopt 1～3 time, if will obtain better closely knit effect, the vibroroller cmpacting pass can be increased to 5.

Foundation structure provided by the invention, draining is smooth, can meet or exceed the quality of traditional ground.Compare with preloading, its characteristic has three: (1) has saved the operation of vertical plate, low price; (2) vibrating roller replaces preloading, has exempted the preloading construction and moves and abandon the side of abandoning; (3) importantly saved the ground processing time, embankment construction and ground have been handled finished synchronously.The horizontal draining board consolidated subsoil mainly is applicable to the large tracts of land that does not have big point load, the hydraulic fill foundation of middle small load, as the stockyard of civil engineerings such as harbour, power plant, road, ash disposal area etc.The hydraulic reclamation material is required to be silt and fine sand, requires hydraulic reclamation can bear vibrating roller deadweight and vibration force after a couple of days.The horizontal draining board consolidated subsoil combines dredge fill and ground processing effectively according to the characteristics of waterpower hydraulic fill foundation construction in layer, is the effective scheme of encrypting hydraulic reclamation powder fine sand.The ground that the utility model provides, standard penetration test shows: the mark of hydraulic reclamation fine sand passes through to hit counts 3～4 times that bring up to when not handling.Standard injection, static sounding and load plate test show that all the ground of reinforcing has reached the bearing capacity that the engineering terrace requires, sedimentation and the target that do not liquefy.Though this programme proposes and application success at the powder fine sand of hydraulic reclamation, its basic principle is equally applicable to saturated dredger soft soil and the bigger embankment of water content, directly adopts or change a little just to may extend in these engineerings.There is the coastline of numerous basins such as the Changjiang river, the Yellow River, the Zhujiang River and thousands of kilometers in China, a large amount of river shoal hydraulic reclamations is arranged and the engineering of reclaiming fields from the sea every year.With the minimizing that area can be ploughed in the landing field, the hydraulic reclamation engineering will be more and more many also.Because quick, the low price and simple of horizontal draining board vibrating roller platen press have broad application prospects in waterpower hydraulic reclamation engineering foundation is reinforced, and can save a large amount of construction investments and building time.

Description of drawings

Fig. 1 is embodiment 1 structural representation;

Fig. 2 is the north and south sectional drawing of Fig. 1;

Fig. 3 is the thing sectional drawing of Fig. 1.

The specific embodiment

Embodiment 1, certain 450,000 kilowatts of power plant needs hydraulic reclamation to form 90 hectares of places, and to wherein 24 hectares carry out ground and handle, require to reach 50kPa bearing capacity of foundation soil, settlement after construction under the 50kPa load action less than 50mm and under seismic condition sand do not liquefy.Adopt horizontal draining board vibrating roller platen press in the dredge fill process, form the waterpower hydraulic fill foundation, with reference to Fig. 1～Fig. 3: the soil layer of filling out at first 1 is 4m, and the plastic draining board 2 of one deck horizontal positioned is laid in the back, between each band drain apart from 0.15m.Carry out vibroroller cmpacting after filling out a soil layer 3 again, 1 become the filler of handling well after, repeat to be provided with band drain, banket, roll, so repeatedly until end.Among Fig. 1,3 is the soil layer that is rolling; 4 is multistage sub-weir, and 5 is original ground.More than each soil layer thick 5.0m, 7.0m, 8.0m respectively.Stake long 8～15m, length overall 14.6m, the vibro-replacement stone column method of cost up to 3,780,000 dollars are adopted in suggestion in the former letter of invitation to tender of present embodiment; Adopt after the horizontal drainage vibrating roller platen press of the present invention, only 500,000 dollars of costs are compared with former scheme and to have been saved more than 320 ten thousand dollars of ground handlings.Importantly finish hydraulic reclamation and ground treatment construction on schedule and do, avoided seller's seven sale 30,000 dollars huge fine every day, economic benefit is very huge.

Claims (3)

1, a kind of horizontal draining board consolidated subsoil is provided with band drain between the silt layer, it is characterized in that: band drain is that level is laid.

2, according to the described horizontal draining board consolidated subsoil of claim 1, it is characterized in that: the thickness of the layer is 0.5～2 meter between the two-layer band drain, and the lateral separation between the band drain is 1～3 meter.

3, according to claim 1 or 2 described horizontal draining board consolidated subsoils, it is characterized in that: be blossom type or arranged in squares between each layer band drain.

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