水泥粉喷桩在地基处理中的应用(Application-of-cement-powder-spraying-pile-in-foundation-treatment).doc

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Cement powder spray pile in foundation treatment using 2009-4-10 16:26:00 source: Global Online Channel: Structural Engineer

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水泥粉喷桩在地基处理中的应用（Application of cement powder spraying pile in foundation treatment）
Cement powder spray pile in foundation treatment using 2009-4-10 16:26:00 source: Global Online Channel: Structural Engineer

Abstract: in civil engineering construction, often encountered bad geological conditions, it is necessary to deal with it, in order to meet the requirements of the structure of the foundation. There are many kinds of ground treatment methods [1], in which cement powder injection pile foundation has been widely used in recent years.

Key words: cement injection pile; foundation; application

1. Brief introduction of powder injection pile

Pile are learning the introduction of foreign high pressure jet grouting pile based on the innovation and development of the new type of pile, our own innovation and the development of complete sets of construction equipment and technology, advantages of this kind of pile can be improved: strengthening foundation, improve the bearing capacity of Foundation (2-3 times) and the stability of the water, no pollution to the environment, no noise, no influence on adjacent buildings, equipment simple hydraulic control technology is easy to grasp, a pile of high efficiency (8m long piles, each pile machine can be completed every day 100), the cost of reinforcement is lower than the construction cost of pile pile for low 40%. 7 layer below and cohesive soil in groundwater or soil water content more than 25% sand, soft soil, silt soil in the shallow layer (deep 14m) pile reinforcement, but this is not applicable to miscellaneous (MSW) (the foundation bearing capacity is not uniform and soil) The water content is not less than 23%, otherwise it will cause the pile to be loose.

2, engineering examples

2.1, engineering works for the South yanchangbu Street commercial building, the foundation excavation part after the emergence of a large number of silt soil, soil depth and small thickness of 3.5 meters, the Geological Exploration Department of the construction site of the evaluation is: the venue for the soft site, belonging to three types of soil, ground water level of 0.9 meters below the surface.

2.2, the foundation treatment requirements of the building features is the large upper load, and the soil is weak; basic form of residential building drawings for raft foundation requirements 150kPa value for the bearing capacity of the foundation, not up to the value of 110kpa bearing standard test foundation construction site foundation bearing capacity; allowable settlement is less than 200mm; the owners required to reduce the cost of foundation treatment as much as possible.

2.3, treatment options, Nanpu district on this kind of foundation often use prefabricated pile or cast-in-place pile, the survey unit also suggested the use of cast-in-place pile, the project department to make the foundation treatment scheme. After Party A, design, supervision, construction and management departments of the various arguments, research and comparison of the cost of the program shows that the final selection of our ground treatment program. It is applicable to reinforce the soil with cement injection pile. The mixing pile is more economical than the cast-in-place pile and has less influence on the surrounding environment.

2.4. Design and design of composite foundation of powder injection pile, effective pile length L=5.5m, pile diameter 0.5m, plus solid chamber compressive strength is 2Mpa (through laboratory test to determine cement mixing ratio is 15%). From the literature 1 (9.2.2-2), (9.2.2 - 3) calculate the bearing capacity of a single pile Rke=140KN; according to (9.2.2-1) formula can be calculated: the replacement rate of residential buildings m=0.3, according to the layout of the pile, the pile used in rectangular form.

2.5, construction methods, spraying the use of curing agent for P.O32.5 ordinary portland cement, the use of domestic PH-5A type powder injection pile machine construction.

(1) the site shall be leveled before the construction, the pile location shall be determined and numbered, and the assembling frame shall be provided with a powder injection pile machine to check whether the main engine and other systems are working properly.

(2) according to the layout plan of pile location, row number of pile and construction flow section, the moving mixing main machine aims at the design pile position.

(3) turn on the mixer after drilling into the 50cm, while drilling with the jet, pay attention to prevent the clogging of the powder injection hole, with the drill pipe drilling, reinforcement soil in situ stirring, chopping, drilling to the design depth, stop drilling.

(4) when the drill pipe is drilled to the design depth, it rotates backward, starts the cement transmitting device, raises the side of the drill pipe to stir, and the hoisting speed should be less than 1m/min, and the forced powder is stirred with the soil in situ. When the drill is raised to about 2m of the top of the pile, the hoisting speed should be reduced. Lift to more than the design height of 30-50cm, turn off the cement transmission device, the rig rotates in situ, 1min, continue to ascend to the ground. Dusting Pile requires one go, without interruption, jet pressure control in 0.5-0.8N/MM2. in order to improve the strength of the pile and the bearing capacity, to avoid uneven mixing, then was stirred 1 times in the original pile length, the pile body is completed.

2.6, to ensure the strength and integrity of the pile, the key lies in the amount of powder control and mixing is even, in view of this situation, the construction of the following measures taken.

(1) adopt "one spray four stirs" craft, its process is as follows. Measuring unreeling machine in place pile drilling in the end (jet) - boot - top (powder) - reverse lifting forward repuddling end - reversal (jet) - to enhance the displacement of pile machine.

(2) in the formal construction before choosing a certain number of pile test, to determine the pile construction technique for the parameters in the engineering geological conditions (pile machine drilling speed, stirring speed and enhance the jet mixing speed, scraping speed and spray dust stirred to enhance the speed of the air compressor, air pressure and air volume etc.).

(3) the control of pile position deviation is not greater than 5cm, pile verticality deviation is less than 1.5%, the diameter of the pile deviation <4%, pile length deviation of <50mm per meter cement injection quantity and the design value deviation of <3%.

(4) take 24h Quality Supervision Inspection valet service industry, focus on examination of the spray volume per meter, pile length, pile and pile drilling machine verticality and lifting speed, in addition, the use of electronic scales (metering device) to control the spray volume of each pile, and each meter record of a dusting. In order to accurately track the piles from bottom to top quality, once at a depth of gray shortage or broken ash, can accurately fill spray.

(5) if drilling, plugging or mechanical failure occurs during drilling or dusting, the drilling shall be stopped immediately and the drilling and re drilling shall be carried out after completion of the treatment.

(6) cement must be checked and qualified before use.

2.7, pile quality inspection, this project altogether hits hits the cement powder spraying pile 13587, the total extension 118880 meters. After the owners agree, the following 4 kinds of pile testing method.

(1) cone penetration test: the strength test of pile body is carried out with light dynamic penetration test in 7d after completion of pile, the number of inspection is 2%, and the pile is found to be treated in time. A total of 280 piles were detected, and 20 piles were found.

(2) pile head excavation: pile 7d, 2% piles, about 60cm deep excavation,

Check the diameter of the pile body, the border of the pile body, the homogeneity of lime soil mixing and the compactness of the pile body. 250 piles were tested, and the shape of the pile body was in good condition.

(3) drilling core compression test: after the pile is 28d, 6 piles are taken for core inspection, and the compressive strength and shear strength of the pile are measured by sampling and maintenance. Test results show that the pile has reached the design depth, good shape, the coring rate greater than 75%; the compressive strength of the pile is about 3.1 ~ 4.6Mpa, cohesion 1.9Mpa and internal friction solution which is 22.1 degrees, are to meet the design requirements.

(4): 28d load test pile selected 4 groups of single pile composite foundation loading test, according to the "technical code for ground treatment of buildings" (JGJ79 - 91) test methods specified, determine the residential building of DJM pile composite foundation bearing capacity of FK is larger than 180kpa, meet the design requirements. With the increase of age, the bearing capacity of the foundation still increases to a certain extent.

2.8, effect evaluation, this project adopts cement injection pile to deal with weak foundation, and the bearing capacity of foundation increases from 110kpa to 180 ~ 200KPa, and the strength increases about 1 times. Since the building has been completed and accepted for three years, no uneven settlement of foundation and cracks in the upper structure have been found, and the reinforcement effect is good. The project has been awarded high quality project in Nanpu development zone.

By adopting the scheme, the utility model has the advantages of simple equipment, convenient construction, fast speed, no vibration, no pollution, etc., and the cost is low, and the cost is reduced by 40%. by using the cast-in-place pile, and the cost is saved by 400 thousand yuan for the first party.

3, pay attention to the problem

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(1) materials are different. The powder jet pile is formed by the induration between the cementitious material and the undisturbed soil and natural water, and the coarse aggregate is