CN102261068A

CN102261068A - Deep mixing pile

Info

Publication number: CN102261068A
Application number: CN2011101159613A
Authority: CN
Inventors: 高路恒
Original assignee: Nanjing Institute of Technology
Current assignee: Nanjing Institute of Technology
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2011-11-30
Anticipated expiration: 2031-05-06
Also published as: CN102261068B

Abstract

The invention discloses a novel deep mixing pile and belongs to the technical field of civil engineering construction. Compared with the traditional cement soil mixing pile, the novel deep mixing pile adopts a new material, namely urban garbage incineration ash, wherein the pile body is formed by mixing and stirring the urban garbage incineration ash (mixed with cement in a certain ratio when necessary) and foundation soil by using a stirring machine. A construction method of the novel mixing pile comprises the following steps of: a, positioning; b, premixing and sinking; c, preparing cement and garbage slurry; d, lifting guniting and stirring; e, stirring up and down repeatedly; f, cleaning; and g, shifting. The novel deep mixing pile strengthens the foundation soil, improves bearing capacity of the foundation soil and stops water by a proper construction method. The remarkable advantages are that: compared with a preformed pile, a bored concrete pile, an anchor rod in soil and the like, the novel deep mixing pile saves cement, is more economic and practical, greatly reduces cost, changes waste into treasure, and has good economic and social benefits.

Description

Deep-mixed pile

Technical field

The present invention relates to a kind of underground deep layer agitation pile that utilizes the city garbage burning ash, belong to the technical field of Construction of Civil Engineering.

Background technology

In recent years, the generation of municipal refuse increases day by day, environment is caused increasing influence.In order to protect our home, garbage reclamation and utilization rationally can be able to be turned waste into wealth.By research, this innoxious refuse incineration slag can be with a wide range of applications in fields such as building materials, road, bridge engineering.

The chemical analysis of city garbage burning ash shows: the main component of bottom ash is SiO ₂, Al ₂O ₃, CaO, Fe ₂O ₃With unburnt charcoal, wherein mainly consist of SiO ₂=34.32%～49.53%, CaO=15.66%～35.23%, Al ₂O ₃=8.59%～13.54%, Fe ₂O ₃=5.28%～10.23%; Secondly also contain Na ₂O, K ₂O, MgO etc.In the U.S. and Holland, the part that bottom ash (or mixed ash) is used as in the concrete substitutes aggregate.Modal is that bottom ash, water, cement and other aggregate are made concrete brick by a certain percentage, and correlation technique is in the existing commercial applications of the U.S..

From 1985, the scientific research of seas center waste management of U.S. Stony Brook university began to assess the various oceans of stable back cinder and the feasibility that land utilizes.They are in Long IslandSound seabed, and the cement brick made from stable back incineration residue has built up 2 artificial submerged reefs.In 6 years experimental periods, studies show that the poisonous and harmful element of organic or inorganic is not exuded in the environment from the incineration residue cement brick.Then, they have carried out a series of research, estimate cinder substitutes aggregate as cement for building feasibility.The result shows: adopt the incineration residue in the different places of production to make the cement brick that meets or surpass American Standard of Testing Materials (ASTM), proved the technical feasibility that the lime-ash building materials utilize.In addition, a demonstration project of utilizing ash bricks to build boathouse is also set up, in this project, they are with 350 t lime-ash (100 t mixed ash, 250 t bottom ash) mix with portland cement, be made into the standard hollow brick with traditional brickmaking technology, build up the boathouse that 27m is long, 18m is wide, 7m is high with this brick then.30 middle of the month after building up, the air sample that the researcher periodically collects in the boathouse is measured (TSP, particulate form and gaseous state PC2DDPPCDF, volatilization and half volatile organic compounds and volatility Hg etc.) and is compared analysis with the ambient atmosphere sample, pedotheque before and after rainwater sample that contacts with the boathouse enclosure wall and boathouse build up is also gathered in order to analyze trace element wherein, and the result shows: the air quality in the boathouse is identical with ambient atmosphere; Environmental correclation pollutant in the lime-ash can be retained in the cement matrix effectively; Engineering test shows that also the compressive strength of this ash bricks and standard concrete brick is suitable.These studies show that the environment compatibility of cinder and the functional performance of material are safe and reliable.

Summary of the invention

The objective of the invention is to utilize the city garbage burning ash, a kind of New Type of Deep agitation pile (being similar to EFFECT OF CEMENT STABILIZED SOIL RETAINING WALL) is provided, both reinforced foundation soil, improved the bearing capacity of foundation soil, can solve the insoluble urban environment problem of present society again.

To achieve these goals, the technical scheme taked of the present invention is:

Deep-mixed pile, pile body comprise city garbage burning ash and cement, and its construction technology process is:

1) location: mixer runs to the place, stake position of appointment, and centering also guarantees that pile frame is vertical, when ground is uneven, should adjust pedestal maintenance level;

2) premixing sinking: starting mixer motor, loosen crane rope, mixer is stirred along leading truck cut the soil sinking, the speed of sinking can be controlled by the current monitoring table of motor, if it is too slow to sink, can be from defeated slurry system supply clear water in order to creeping into;

3) slurry of preparation cement and city garbage burning ash: when waiting mixer to sink to certain depth, promptly begin to mix the slurry of system cement and rubbish ash, and calculate every 1m by the match ratio that design is determined ³Cement-soil adds the slurry volume that should inject in the solid, and the density of slurries, treats before the mud jacking slurry to be poured in the aggregate bin;

4) promote whitewashing and stirring: after mixer sinks to projected depth, open mortar pump the compo for preparing is pressed in the ground, the rotation while whitewashing is simultaneously in strict accordance with designing the hoisting velocity lifting mixer of determining;

5) repeat upwards, stir downwards: mixer be promoted to the design reinforcement layer the end face absolute altitude time, the just in time emptying of compo in the aggregate bin, for weak soil and compo are stirred, can once more mixer be sunk to while rotating in the soil, to the design reinforcement degree of depth, again mixer is lifted out ground;

6) clean: inject proper amount of clear water in each aggregate bin, open mortar pump, clean compo remaining in whole pipelines, until clean substantially, and the weak soil that will stick on the stirring-head cleans up;

7) displacement: repeat above-mentioned 1 ~ 6 step, carry out the construction of next pile again.

Deep-mixed pile of the present invention, when carrying out Deep Mixing Piles Construction, the used cement of its part is replaced with the city garbage burning ash, have the following advantages: 1) this New Type of Deep agitation pile soil-baffling structure has good impervious feature, can be when excavation of foundation pit without well-points dewatering, thus avoid underground pipelines and building work the mischief peripherally; 2) utilize this method construction pollution-free, essentially no vibration and noise, cost is ultralow, if can adopt this method as space enclosing structure, is undoubtedly a kind of the most economic scheme; 3) the method can reduce the rubbish in city, and rubbish is become the dotey, is applied to fields such as building materials, road, can be described as the environmental problem that has alleviated our countries; 4) by the rubbish ash is suitable for by necessarily mixing than row with cement, reduced the consumption of cement, because the cost of the high far away discharging garbage ash of cost of cement, so greatly reduce construction costs.

Description of drawings

Fig. 1 is the technological process of production schematic diagram of agitation pile of the present invention

Specific embodiment

For further understanding summary of the invention characteristics of the present invention and effect embodiment once for example now, and conjunction with figs. is described in detail as follows.

As shown in Figure 1, the technological process of production of the present invention is as follows:

3) preparation cement and rubbish ash slurry: when waiting mixer to sink to certain depth, promptly begin to mix system cement and rubbish ash slurry, and calculate every 1m by the match ratio that design is determined ³Cement-soil adds the slurry volume m that should inject in the solid ³, and the density g/cm of slurries ³, treat before the mud jacking slurry to be poured in the aggregate bin;

For example: the known water gray scale is 0.45, during cement mixed ratio 14%, and 1m ³The total amount of cement that consumes in the cement-soil and rubbish ash (abbreviation concrete grey) is 14% * 19.2kg=268.8kg=0.2688t.When the density of water and concrete grey is got 1.0g/cm respectively ³And 3.0g/cm ³The time, 1m then ³Should inject slurries amount V in the cement-soil and be V=0.2688 * 0.45+(0.2688/3.0)=0.1210+0.0896=0.2106m ³, and the density p=(0.1210+0.2688 of slurries)/0.2106=1.8510g/cm ³

4) promote whitewashing and stirring: after mixer sinks to projected depth, open mortar pump compo is pressed in the ground, the rotation while whitewashing promotes mixer in strict accordance with the definite hoisting velocity of design simultaneously, and general hoisting velocity is no more than 0.8m/min;

Agitation pile of the present invention is compared with traditional cement mixing method, used main material cement is changed into cement and rubbish ash mixture, greatly reduce cost, can be used for engineering to municipal refuse again, both reinforced foundation soil, improve the bearing capacity of foundation soil, suitable job practices can reach the purpose of sealing again, and more significant advantage is, than adopting preformed pile, castinplace pile, soil bolt etc. more can save cement, more economically, be suitable for, greatly reduce cost, turn waste into wealth.

Claims

1. deep-mixed pile, pile body comprises city garbage burning ash and cement, its construction technology process is:

2. deep-mixed pile according to claim 1 is characterized in that: described process step 3), and ratio≤0.45 of cement and rubbish ash.

3. deep-mixed pile according to claim 1 and 2 is characterized in that: described process step 4), and the hoisting velocity≤0.8m/min of mixer.