CN107675702B - Construction method of waste incineration ash pile - Google Patents
Construction method of waste incineration ash pile Download PDFInfo
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- CN107675702B CN107675702B CN201710958850.6A CN201710958850A CN107675702B CN 107675702 B CN107675702 B CN 107675702B CN 201710958850 A CN201710958850 A CN 201710958850A CN 107675702 B CN107675702 B CN 107675702B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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Abstract
A construction method of a pile for burning ash slag of garbage belongs to the technical field of resource utilization of solid waste and foundation treatment, and is used for solving the problem of waste utilization of the burning ash slag of garbage, and is characterized by comprising the following steps: a. sinking a steel pipe 2 with a concrete precast pile tip 1 into a foundation 3 to form a pile hole; b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture; c. pouring the mixture into a steel pipe 2 which is pre-sunk into the foundation, and embedding a grouting pipe 4 and a slurry pumping pipe 5 into the mixture 6 in the process of pouring the mixture; d. after the mixture 6 is filled into the pile hole, the steel pipe 2 is pulled out; e. evacuating liquid in the mixture holes in the pile holes through a slurry pumping pipe 5, then injecting cementing liquid through a grouting pipe 4 until the mixture holes in the whole pile holes are filled, and standing for 6-24 hours; f. and e, repeating the operation for 4-6 times to complete the construction of the waste incineration ash pile.
Description
Technical Field
The invention relates to a construction method of a pile composite foundation by taking municipal solid waste incineration bottom slag as a main aggregate, belonging to the technical field of solid waste resource utilization and foundation treatment.
Background
The residual bottom slag after the municipal solid waste is incinerated to generate electricity is used as solid waste, and the main disposal method at present is to send the solid waste to a landfill site for landfill, so that a large amount of landfill sites are occupied. The municipal solid waste incineration bottom slag is an effective way for reduction and resource utilization and disposal of the building material, and can be used as a material for road filling and foundation replacement after being mixed or cemented with other building materials. The pile body composite foundation in the soft foundation treatment technology and the guard pile in the deep foundation pit support structure both relate to the application of a bonded pile, and the pile body of the commonly used bonded pile generally adopts cement as a cementing agent to bond discrete aggregates such as broken stone and sand or natural soil bodies such as clay and silt to form the bonded pile. Meanwhile, some techniques for constructing the bonded pile by adopting other chemical and biological cementing materials are applied. The microorganism induced calcium carbonate crystallization technology (MICP technology) can also realize the cementation of discrete materials, but for different cementation objects, the cementation method and the effect have obvious difference, and the microorganism induced calcium carbonate crystallization technology is currently used for cementing natural sandy soil, silt and cohesive soil particles, so that the original loose soil body can have higher strength and has the advantages of ecology and environmental protection. The municipal solid waste incineration bottom slag is used as aggregate, and the bonding pile is formed by adopting a microbial bonding technology, so that organic unification of resource utilization of solid waste and foundation treatment by an environment-friendly construction technology can be realized.
Technical scheme of prior art I
A cement-soil pile is made up through such technological steps as mixing soil with cement in a certain proportion by stirring machine, powder spraying while stirring, wet spraying while stirring bidirectionally, drilling by stirring bit to spray cement paste or cement powder into soil, and stirring with blades of stirring head.
Disadvantages of the first prior art
The cement is used as a main cementing material of the cement soil pile body, the using amount is large, the cement is a material with high energy consumption and high pollution, and the emission of dust and nitrogen oxides generated in the preparation of clinker all cause great harm to the environment.
Technical scheme of prior art II
The CFG pile is made up by mixing broken stone, stone chips, sand and flyash with cement and water in advance, making pile hole on foundation by pipe-sinking method, pouring pile material, curing and hardening.
Disadvantages of the third prior art
Although the CFG pile utilizes industrial waste fly ash as one of the aggregates, the CFG pile still uses cement materials with high energy consumption and high pollution, and the pile body adopts broken stone materials, so that the consumption of natural broken stone resources is high.
Technical scheme of prior art III
The industrial waste material stirring pile uses solid industrial waste material as cementing agent of deep stirring pile, and uses stirring machine to stir soil and cement according to a certain mixing ratio to form pile on site, and uses the industrial waste material including steel slag, high-calcium ash and mixed ash as main cementing material, and uses fluorgypsum as exciting agent instead of silicate cement to make cementing pile.
Disadvantages of the third prior art
The heavy metal content in the leaching solution of the industrial waste stirred soil is high, and the environment of underground water is polluted to a certain extent.
Technical scheme of prior art four
The method comprises the steps of preparing pile holes on a soft foundation to be treated by microorganism grouting and draining sand piles, pouring sand to form sand piles, injecting microorganism bacterium liquid and nutrient salt solution, cementing sand grains by microorganism induced calcium carbonate crystallization technology, and preparing the microorganism grouting and draining sand piles.
Disadvantages of the prior art
The pile body aggregate adopts sand as a raw material, does not have the function of consuming solid waste, and cannot realize resource utilization of the solid waste; in the construction process of the pile, only grout is injected and not recovered, and the cementing residual liquid can have adverse effects on soil bodies around the pile.
Disclosure of Invention
The technical problem is as follows: the invention aims to utilize waste incineration bottom slag as aggregate of a bonded pile, utilize a microorganism induced calcium carbonate crystallization technology to prepare a pile hole, and then adopt waste incineration ash slag mixed with bacteria liquid for pouring and cementing cement slurry, and prepare a waste incineration ash slag pile through processes of microbial bacteria adsorption and fixation, urease hydrolysis, crystallization and cementation and the like. The construction method utilizes waste incineration ash and slag, saves materials such as cement materials, natural broken stones and sand, has good economic benefit, and has good environmental protection and environmental benefit by means of microbial cementing.
Technical scheme
The principle of the invention is as follows: firstly, preparing a mixture from a bacterial liquid, a fixing liquid, waste incineration ash and medium sand, pouring the mixture into a steel pipe which is pre-sunk into a foundation, embedding a grouting pipe and a slurry pumping pipe in the process of pouring the mixture, then repeatedly injecting a cementing liquid through the grouting pipe and pumping out residual pore liquid through the slurry pumping pipe, so that microorganisms are induced to generate calcium cementing minerals, filling particle gaps, cementing loose waste incineration ash and medium sand particles, and fixing harmful substances in the waste incineration ash to form a high-strength and high-permeability pile body.
A construction method of a waste incineration ash pile is characterized by comprising the following steps:
a. sinking a steel pipe 2 with a concrete precast pile tip 1 into a foundation 3 to a designed pile length depth to form a pile hole;
b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture;
c. pouring the mixture into a steel pipe 2 which is pre-sunk into a foundation, embedding a grouting pipe 4 and a slurry pumping pipe 5 into the mixture 6 in the process of pouring the mixture, embedding the grouting pipe 4 on the central axis of a pile hole, wherein the distance between a pipe orifice at the bottom and the bottom of the pile hole is 1/3 pile hole length, embedding the slurry pumping pipe 5 along the inner wall of the steel pipe 2, and the distance between the pipe orifice at the bottom and the bottom of the pile hole is 0.5 m;
d. after the mixture 6 is filled into the pile hole, the steel pipe 2 is pulled out;
e. evacuating liquid in the mixture holes in the pile holes through a slurry pumping pipe 5, then injecting cementing liquid through a grouting pipe 4 until the mixture holes in the whole pile holes are filled, and standing for 6-24 hours;
f. and e, repeating the operation for 4-6 times to complete the construction of the waste incineration ash pile.
The construction method of the waste incineration ash pile is characterized in that the bacterial liquid in the step b consists of Bacillus pasteurianus S.pasteureri and culture liquid, and the concentration OD of the bacterial liquid
600＝1.0～1.5。
The construction method of the waste incineration ash pile is characterized in that the waste incineration ash is bottom slag generated by burning urban domestic garbage for power generation, and the particle size is not more than 20 mm.
The construction method of the waste incineration ash pile is characterized in that the mixture in the step b comprises the following components in parts by weight: 10-15 parts of bacterial liquid, 60-65 parts of waste incineration ash, 10-15 parts of medium sand and 0.05mol/L CaCl
210-15 parts of a solution.
The construction method of the waste incineration ash pile is characterized in that the cementing liquid in the step e is CaCl
2And urea in which CaCl is present
2The concentration of (A) is 1.0-1.5 mol/L, and the concentration of urea is 1.0-1.5 mol/L.
The invention has the beneficial effects that:
(1) the waste incineration bottom slag is used as the aggregate, so that the consumption of natural sand and stone materials is reduced, the waste incineration bottom slag is recycled, the landfill amount of solid wastes is reduced, and the economic efficiency is good; (2) the microorganism-induced mineralized substance is used as the cementing substance among the particles of the waste incineration bottom slag, so that the use of cement-based cementing materials with high energy consumption and high emission in the production process is avoided, and the good ecological benefit is achieved; (3) the waste incineration bottom slag has large particle pore, large specific surface area and good microbial cementing effect, can form a high-strength pile body, has good permeability, and can be used as a composite foundation reinforced pile body and a foundation vertical drainage body.
Drawings
FIG. 1 is a schematic vertical section view of a construction method of a waste incineration ash pile
Reference numerals: 1-prefabricating a pile tip by concrete; 2-a steel pipe; 3-foundation; 4-grouting pipe; 5-a slurry pumping pipe; 6-mixing the materials.
Detailed Description
Example 1
In the embodiment, the construction method of the waste incineration ash pile is used for constructing a composite foundation, the pile length is designed to be 9.0m, the pile diameter is designed to be 0.6m, and the method comprises the following steps:
a. sinking the steel pipe 2 with the concrete precast pile tip 1 into the foundation by 3 to 9.0m depth to form a pile hole;
b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture;
c. pouring the mixture into a steel pipe 2 which is pre-sunk into a foundation, embedding a grouting pipe 4 and a slurry pumping pipe 5 into the mixture 6 in the process of pouring the mixture, embedding the grouting pipe 4 on the central axis of a pile hole, wherein the distance between a pipe orifice at the bottom and the bottom of the pile hole is 3.0m, embedding the slurry pumping pipe 5 along the inner wall of the steel pipe 2, and the distance between the pipe orifice at the bottom and the bottom of the pile hole is 0.5 m;
d. after the mixture 6 is filled into the pile hole, the steel pipe 2 is pulled out;
e. evacuating liquid in the mixture pores in the pile hole through a slurry pumping pipe 5, then injecting cementing liquid through a grouting pipe 4 until the mixture pores in the whole pile hole are filled, and standing for 12 hours;
f. and e, repeating the operation for 4 times to finish the construction of the waste incineration ash pile.
In step b of this example, the bacterial liquid concentration OD
6001.5, the mixture comprises the following components in parts by weight: bacterium liquid 15 parts and refuse incineration60 parts of ash, 10 parts of medium sand and 0.05mol/L CaCl
2Weighing 450kg of bacteria liquid, 1800kg of waste incineration ash, 300kg of medium sand and 0.05mol/L of CaCl according to the weight ratio of 15 parts of solution
2450kg of solution.
In step e of this example, CaCl was present in the cement
2The concentration of (2) is 1.5mol/L, and the concentration of urea is 1.5 mol/L.
Example 2
In the embodiment, the construction method of the waste incineration ash pile is used for constructing a composite foundation, the pile length is designed to be 12.0m, the pile diameter is designed to be 0.5m, and the method comprises the following steps:
a. sinking the steel pipe 2 with the concrete precast pile tip 1 into the foundation by 3 to 12.0m depth to form a pile hole;
b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture;
c. pouring the mixture into a steel pipe 2 which is pre-sunk into a foundation, embedding a grouting pipe 4 and a slurry pumping pipe 5 into the mixture 6 in the process of pouring the mixture, embedding the grouting pipe 4 on the central axis of a pile hole, and setting the distance between the bottom pipe orifice and the bottom of the pile hole to be 4.0m, embedding the slurry pumping pipe 5 along the inner wall of the steel pipe 2, and setting the distance between the bottom pipe orifice and the bottom of the pile hole to be 0.5 m;
d. after the mixture 6 is filled into the pile hole, the steel pipe 2 is pulled out;
e. evacuating liquid in the mixture pores in the pile hole through a slurry pumping pipe 5, then injecting cementing liquid through a grouting pipe 4 until the mixture pores in the whole pile hole are filled, and standing for 24 hours;
f. and e, repeating the operation for 4 times to finish the construction of the waste incineration ash pile.
In step b of this example, the bacterial liquid concentration OD
6001.2, the mixture comprises the following components in parts by weight: 10 parts of bacterial liquid, 65 parts of waste incineration ash, 15 parts of medium sand and 0.05mol/L CaCl
210 parts of solution, and according to the weight ratio, 283kg of bacteria liquid, 1837kg of waste incineration ash, 424kg of medium sand and 0.05mol/L of CaCl are respectively weighed
2283kg of solution.
In step e of this example, CaCl was present in the cement
2Has a concentration of 1.2mol/L and a concentration of 1.2mol/L of ureal/L。
Example 3
In the embodiment, the construction method of the waste incineration ash pile is used for constructing a drainage consolidation foundation, the pile length is designed to be 12.0m, the pile diameter is designed to be 0.4m, and the method comprises the following steps:
a. sinking the steel pipe 2 with the concrete precast pile tip 1 into the foundation by 3 to 12.0m depth to form a pile hole;
b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture;
c. pouring the mixture into a steel pipe 2 which is pre-sunk into a foundation, embedding a grouting pipe 4 and a slurry pumping pipe 5 into the mixture 6 in the process of pouring the mixture, embedding the grouting pipe 4 on the central axis of a pile hole, and setting the distance between the bottom pipe orifice and the bottom of the pile hole to be 4.0m, embedding the slurry pumping pipe 5 along the inner wall of the steel pipe 2, and setting the distance between the bottom pipe orifice and the bottom of the pile hole to be 0.5 m;
d. after the mixture 6 is filled into the pile hole, the steel pipe 2 is pulled out;
e. evacuating liquid in the mixture pores in the pile hole through a slurry pumping pipe 5, then injecting cementing liquid through a grouting pipe 4 until the mixture pores in the whole pile hole are filled, and standing for 6 hours;
f. and e, repeating the operation for 4 times to finish the construction of the waste incineration ash pile.
In step b of this example, the bacterial liquid concentration OD
6001.0, the mixture comprises the following components in parts by weight: 10 parts of bacterial liquid, 65 parts of waste incineration ash, 15 parts of medium sand and 0.05mol/L CaCl
210 parts of solution, and according to the weight ratio, 283kg of bacteria liquid, 1837kg of waste incineration ash, 424kg of medium sand and 0.05mol/L of CaCl are respectively weighed
2283kg of solution.
In step e of this example, CaCl was present in the cement
2The concentration of (2) is 1.0mol/L, and the concentration of urea is 1.0 mol/L.
Claims (5)
1. A construction method of a waste incineration ash pile is characterized by comprising the following steps:
a. sinking a steel pipe (2) with a concrete precast pile tip (1) into a foundation (3) to a designed pile length depth to form a pile hole;
b. uniformly mixing the bacterial liquid with the medium sand and the waste incineration ash, and then adding 0.05mol/L calcium chloride solution to mix into a mixture;
c. pouring the mixture into a steel pipe (2) which is pre-sunk into a foundation, embedding a grouting pipe (4) and a slurry pumping pipe (5) in the mixture (6) in the process of pouring the mixture, embedding the grouting pipe (4) on the central axis of a pile hole, enabling the height of a pipe orifice at the bottom to be 1/3 pile hole length from the bottom of the pile hole, embedding the slurry pumping pipe (5) along the inner wall of the steel pipe (2), and enabling the height of the pipe orifice at the bottom to be 0.5m from the bottom of the pile hole;
d. after the mixture (6) is filled into the pile hole, the steel pipe (2) is pulled out;
e. evacuating liquid in the mixture holes in the pile holes through a slurry pumping pipe (5), then injecting cementing liquid through a grouting pipe (4) until the mixture holes in the whole pile holes are filled, and standing for 6-24 hours;
f. and e, repeating the operation for 4-6 times to complete the construction of the waste incineration ash pile.
2. The method of claim 1, wherein the bacterial liquid in step b is composed of Bacillus pasteurianus S.pasteurii and culture liquid, and the concentration OD of the bacterial liquid is
600＝1.0～1.5。
3. The method for constructing a pile of incineration ash of garbage according to claim 1, wherein the incineration ash of garbage is bottom slag of municipal solid waste after incineration for power generation, and the particle size is not more than 20 mm.
4. The construction method of the waste incineration ash pile according to claim 1, wherein the mixture in the step b comprises the following components in parts by weight: 10-15 parts of bacterial liquid, 60-65 parts of waste incineration ash, 10-15 parts of medium sand and 0.05mol/L CaCl
210-15 parts of a solution.
5. The method for constructing a waste incineration ash pile according to claim 1, characterized in that the cementing liquid in the step e is CaCl
2And urea in which CaCl is present
2Is 1.0 mol/L-1.5 mol/L, and the concentration of urea is 1.0 mol/L-1.5 mol/L.
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| CN108265710B (en) * | 2018-03-07 | 2023-07-14 | 刘寅平 | Post-grouting prefabricated hollow pipe tree root pile structure and construction method |
| CN111236224A (en) * | 2020-02-26 | 2020-06-05 | 苏州大学 | Slag-containing pile foundation structure for deep soft soil layer and construction method |
| CN111535306B (en) * | 2020-05-15 | 2021-10-19 | 北华航天工业学院 | Microbial curing method and irrigation and drainage device suitable for marine soft soil foundation |
| CN112252293A (en) * | 2020-10-12 | 2021-01-22 | 海南大学 | Equal-energy deformation composite foundation for solidifying aggregate by using microorganisms and construction method |
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| JP4234924B2 (en) * | 2001-12-27 | 2009-03-04 | 太平洋マテリアル株式会社 | Ground improvement method |
| CN105268727B (en) * | 2015-11-25 | 2018-06-19 | 浙江理工大学 | The method for realizing incineration of refuse flyash reunionization is acted on using microbial mineralization |
| CN105386436B (en) * | 2015-12-08 | 2018-02-09 | 南京林业大学 | A kind of microorganism soil-fixing constraint discrete material pile composite foundation and construction method |
| CN105839622B (en) * | 2016-05-09 | 2017-09-12 | 苏州大学 | Soft soil foundation reinforcing method based on flying dust, flying dust stake and foundation stabilization pipe casing |
| CN205776148U (en) * | 2016-05-31 | 2016-12-07 | 浙江工业大学 | Sand pile for foundation drainage |
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