CN110130385A - A kind of combination caisson foundation and its construction method suitable for reinforced soft soil ground processing - Google Patents
A kind of combination caisson foundation and its construction method suitable for reinforced soft soil ground processing Download PDFInfo
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- CN110130385A CN110130385A CN201910238715.3A CN201910238715A CN110130385A CN 110130385 A CN110130385 A CN 110130385A CN 201910238715 A CN201910238715 A CN 201910238715A CN 110130385 A CN110130385 A CN 110130385A
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- hollow tubular
- precast hollow
- tubular pole
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/20—Caisson foundations combined with pile foundations
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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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of combination caisson foundations and its construction method suitable for reinforced soft soil ground processing, basis includes several precast hollow tubular poles, it is vertically arranged in soft soil foundation with rectangular, quincunx or rectangle, and manages interior soil after the plant of precast hollow tubular pole and take out, tube top and tube bottom are closed；Layer is filled in reinforcing, is laid on the ground of the soft soil foundation.The present invention takes soil to reach reduction foundation soil weight stress purpose by taking after major diameter Prefabricated hollow pile pile sinking in stake, make to build additional stress control within the scope of foundation soil permission bearing capacity eventually by the adjustment of the parameters such as tube spacing, caliber and immersed tube depth.
Description
Technical field
The present invention is a kind of method of basement process, is adapted to Soft Ground, belongs to technical field of civil engineering.
Background technique
There are many soft-soil foundation treatment method, cement mixing method, high-pressure rotary jet grouting pile, prestressed concrete pipe pile, broken stone pile,
CFG, plastic draining board etc..All methods have respective specific aim and adaptability at present, have respective superiority and
Limitation.Opposite to control to exist and be difficult to control with ultra-deep weak soil, cement mixing method and high-pressure rotary-spray quality of pile, CFG stakes are long
After reaching certain depth, often there is pile breaking phenomenon, the plastic draining board duration is too long, settles very greatly, is difficult to calculate most after use
Accurate sedimentation eventually, broken stone pile can only in the case where weak soil not depth the amount of making, concrete tubular pile after weak soil reaches certain depth its
Cost is very expensive etc..For coastal many ultra-deep Soft Grounds, there are no better application methods at present.It is many high
The design of filled-up ground basement process is in design process at the thing of engineer's headache or after involving great expense or calculating work
Settling amount is huge and settling amount size is uncertain.The Process of Engineering Construction phenomenon that occurs sliding or collapse takes place frequently.For ultra-deep weak soil
A kind of better method for processing foundation is badly in need of wanting to well solve sedimentation and deformation and stable problem in ground and high roadbed basis.
Summary of the invention
Technical problem: in view of the above technical problems, the present invention proposes a kind of combination suitable for reinforced soft soil ground processing
Caisson foundation and its construction method, the basis and method, which pass through to take after major diameter Prefabricated hollow pile pile sinking, to be taken soil to reach to subtract in stake
Small foundation soil weight stress purpose makes to build additional stress control eventually by the adjustment of the parameters such as tube spacing, caliber and immersed tube depth
System allows within the scope of bearing capacity in foundation soil.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme:
A kind of combination caisson foundation suitable for reinforced soft soil ground processing, comprising:
Several precast hollow tubular poles, are vertically plugged in soft soil foundation, and precast hollow with rectangular, quincunx or rectangle
Tubular pole is managed interior soil and is taken out after planting, tube top and tube bottom closing, the diameter D minimum value of precast hollow tubular pole are obtained by following formula:
Wherein, K is the material proportion of precast hollow tubular pole；
D is the wall thickness of precast hollow tubular pole；
M is that weak soil specific gravity is m.
Further include reinforcing layer, the reinforcing layer is covered on planted precast hollow tubular pole after soft soil foundation upper surface.
The material of the reinforcing layer is weak soil, foamed concrete or foaming mortar added with curing agent.
The precast hollow tubular pole is concrete reinforced pipe.
A kind of construction method based on the combination caisson foundation suitable for reinforced soft soil ground processing, including it is following several
A step:
A, preparation of construction, production, maintenance, transport including precast hollow tubular pole are marched into the arena, equipment tissue is marched into the arena installation, place
Smooth and stake position setting-out；
B, precast hollow tubular pole is lowered into soft soil foundation vertically according to determining stake position；
C, by precast hollow after taking soil, single, batch or whole precast hollow tubular poles to sink in precast hollow tubular pole
Soil inside tubular pole takes out；
D, the stake bottom of precast hollow tubular pole is closed, takes soil to terminate rear enclosed in single, batch or whole precast hollow tubular poles
Stake bottom；
E, the stake top of precast hollow tubular pole is closed, single, batch or whole precast hollow tubular pole stake underseals are sealed after closing
Close stake top.
If after step E, the stake top height of each precast hollow tubular pole is identical with soft soil foundation ground level, then directly into
The foundation construction of row top；
If after step E, the stake top height of each precast hollow tubular pole is higher by soft soil foundation ground level, then, in weak soil
Reinforcing layer is filled in gap on earth foundation surface between each hollow stake top.
The reinforcing layer adds cement or other curing agent to carry out mix with the soil taken out out of precast hollow tubular pole, by mix
Mixture afterwards fills gap between each tube top more than the ground of place.
In step C, rotary digging is segmented using rotary digging device or is grabbed with grab bucket segmentation.
Bottom position is equipped with annular groove or lower circumference arranged for interval shrinkage pool, sealed tube in the precast hollow tubular pole
Bottom step carries out tube bottom closing using concreting certain thickness.
The mixing device that the soil taken out out of precast hollow tubular pole adds cement or other curing agent to carry out mix includes:
Cast hopper is arranged in round mix bucket one end top, and discharge port is arranged in other end lower part, and mix bucket inner shaft sets up rotation axis, mixes
It closes setting in bucket and connects multiple axis paddles on axial rotation and the rotating bezel opposite with rotation rotational axis direction, rotation axis
Piece connects multiple frame stirring blades on rotating bezel；Multiple axis stirring blades are vertically connected in rotation axis, are vertically connected on rotating bezel
Multiple frame stirring blades；Axis stirring blade and the interruption-like setting of frame stirring blade；The leaf of axis stirring blade and frame stirring blade
It is unilateral in a certain angle with the axial direction of mix bucket respectively；Rotary material feeder, including spiral rotating piece and drive are set on cast hopper
Dynamic device, driving device are rotatablely connected spiral rotating piece；Pair is set side by side at the cast hopper position entered in mix bucket to feed intake
Mouthful.
The utility model has the advantages that
The control of first, mass is easy, and main concrete reinforced pipe is that have batch production to be process, and quality assurance is easy to do
It arrives, the control of pipe of concrete submergence depth is simple, takes soil simple in pipe, and tube bottom and tube top closing are also easy to make, and meets one
Change assembly flow shop.
2nd, is since caliber is larger, and native withdrawal amount is also larger in pipe, and ground weight stress reduces amplitude also very greatly, thus
Pipe submergence depth is not deep, construction is simple, low cost.
3rd, is allowed building additional load strict control foundation soil within bearing capacity by calculating, and settlement after construction is easy
In control.
4th, which is reduced, uses a large amount of filling material, is a very useful invention to protection environment.
5th, construction is simple, speed of application is fast, short time limit.
Detailed description of the invention
Fig. 1 is work progress schematic diagram of the present invention；
Wherein, 1, precast hollow tubular pole；2, the sealing plate at precast hollow tubular pole stake bottom；3, the envelope of Prefabricated hollow pipe stake top
Plate；4, soft soil foundation；5, stake position；Fig. 2 is that stake top exceeds ground certain altitude, is taken out between stake top in the village light material Huo Yongcong
Soil add curing agent mix backfill schematic diagram；
Wherein, it is backfilled between 6, Prefabricated hollow pipe stake top；
Fig. 3 is that stake top or more loads schematic diagram；
Wherein, coordinate stressed plate between 7, Prefabricated hollow pipe stake top and load；8, load.
Fig. 4 is to calculate single pile weight stress to reduce schematic diagram；
Wherein, the diameter of D, precast hollow tubular pole；D, the wall thickness of precast hollow tubular pole；H, the length of precast hollow tubular pole,
H, sinkage；
Fig. 5 is the sealed tube bottom schematic diagram that groove is arranged in a kind of tube bottom:
Wherein, 9 be reserved groove.
Fig. 6 is the structural schematic diagram of mixing device.
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment to the present invention it is a kind of suitable for reinforced soft soil ground processing
The technical solution of combination caisson foundation and its construction method is described in further detail.
Embodiment 1
We calculate the reduction analyzed and how to pass through ground and basic weight stress with regard to single precast hollow tubular pole
To realize that foundation soil meets Additional Stress of Structure.
Soil in precast hollow tubular pole will be taken out after a precast hollow tubular pole sinking certain depth, precast hollow tubular pole
Ground and basic weight stress variation, the caliber D of precast hollow tubular pole, sinkage H, tube wall are calculated after tube bottom and tube top closing
Thick d (setting thickness 10cm), 1.8 tons every cube of native specific gravity.
In the present embodiment, the precast hollow tubular pole uses prefabricated reinforced concrete tubular pole, armored concrete specific gravity 2.2
Every cube of ton
Because hollow steel bar pipe of concrete specific gravity k is larger, generally 2.2 tons every cube, natural earth specific gravity m take 1.7 tons it is every
Cube, such caliber just has a minimum value, and when caliber is equal to this minimum value, native groundwork soil weight stress is taken out of pipe
It is reduced to zero, only design caliber is greater than minimum value, and native groundwork soil weight stress (foundation soil and pipe total weight) is taken out of pipe
It is bigger that diameter can just be reduced, take native groundwork soil weight stress to reduce amplitude out of pipe bigger.
Hollow steel bar pipe of concrete takes out native weight after taking soil are as follows:
The weight of hollow steel bar pipe of concrete:
Consider least favorable factor, if construction quality goes wrong, underground water enters the weight of water in immersed tube:
If taking weight stress decreasing value after soil in pipe is zero release:
Precast hollow tubular pole diameter minimum value is derived by formula (4)
Natural earth specific gravity m is 1.7 tons every cube, and armored concrete specific gravity K is 2.2 tons every cube, considers armored concrete
The production of pipe, transport is economical, and the factors such as lifting take 0.1 meter of armored concrete thickness of pipe wall, solve equation and obtain D=0.5642 meters.
Theoretically only design caliber is greater than this this diameter value, takes native groundwork weight stress that can just reduce out of pipe, caliber is got over
Big reduction amplitude is bigger.Comprehensively consider various factors, the present invention proposes that caliber is greater than 800 millimeters.
In the present embodiment, the top of precast hollow tubular pole exceeds ground, then adds with light material or with the soil taken out in pipe
Curing agent mix is by space filling between tube top, and can also being easy to calculate ground or more, certain thickness to fill layer basis whole
The weight of the more conventional whole filled ground of body weight is also significantly to reduce, comprehensive ground and the self weight of top filled ground
The significantly reduction of stress, causes final additional stress also significantly to reduce.Pipe can be adjusted by the parameters of ground
The parameters such as diameter, pipe range and pipe thickness, so that additional stress control allows to carry range in lower part ground.This is the reason of this technology
By basis.
The present invention is suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing: the following steps are included:
Precast hollow concrete reinforced pipe transports to behind scene that sink to underground by static pressure or vibration or revolution pressurization certain
Then depth is taken out the soil substep in precast hollow concrete reinforced pipe or disposably, then with rigid material by bottom hole
And orifice closing.Specific step is as follows:
A preparation of construction, including major diameter (diameter is greater than 500mm) concrete reinforced pipe production, maintenance, transport are marched into the arena, if
It is standby to organize installation of marching into the arena, levelling of the land, stake position setting-out etc..
B can be flushed according to true fixed pile vertical subsidence concrete reinforced pipe, tube top with place ground, can also be higher by ground
Face certain position.
Soil (taking soil after single, batch or whole concrete reinforced pipe sinkings) is taken in c pipe.
D sealed tube bottom (takes stopped pipe bottom after soil in single, batch or whole pipes).
E, the stake top of precast hollow tubular pole is closed, single, batch or whole precast hollow tubular pole stake underseals are sealed after closing
Close stake top.
If after step E, the stake top height of each precast hollow tubular pole is identical with soft soil foundation ground level, then directly into
The foundation construction of row top；
If after step E, the stake top height of each precast hollow tubular pole is higher by soft soil foundation ground level, then, in weak soil
Reinforcing layer is filled in gap on earth foundation surface between each hollow stake top.
The reinforcing layer adds cement or other curing agent to carry out mix with the soil taken out out of precast hollow tubular pole, by mix
Mixture afterwards fills gap between each tube top more than the ground of place.
In the step C of the present embodiment, rotary digging is segmented using rotary digging device or is grabbed with grab bucket segmentation.
The present embodiment, bottom position is equipped with annular groove in the precast hollow tubular pole or lower circumference arranged for interval is recessed
Hole, sealed tube bottom step carry out tube bottom closing using concreting certain thickness.
The present embodiment, the soil taken out out of precast hollow tubular pole add cement or other curing agent to carry out mixing and stirring for mix
Device is as shown in Figure 6:
One end top of round mix bucket 50 is arranged cast hopper 10, and other end lower part is arranged discharge port 120, in mix bucket 50
Axis sets up rotation axis 70, and setting is around axial rotation and the rotation opposite with 70 rotation direction of rotation axis in mix bucket 50
Frame 60 vertically connects multiple axis stirring blades 80 in rotation axis 70, multiple frame stirring blades 90 is vertically connected on rotating bezel 60,
Axis stirring blade 80 every and frame stirring blade 90 every are set in distance shape；90 part of axis stirring blade 80 and frame stirring blade
Or whole blade faces is in a certain angle with the axial direction of mix bucket 50 respectively；Rotary material feeder is set on cast hopper 10, including
The driving device 110 that spiral rotating piece 130 and driving spiral rotating piece 130 rotate, 130 revolving speed of spiral rotating piece, which determines, to be entered
Rate of feeding in cast hopper 10；Secondary feeding port 20 is set side by side at 10 position of cast hopper entered in mix bucket 50.
Round mix bucket 50 has certain length and diameter, is determined with adapting to requirement of engineering, and round mix bucket 50 is laterally
It places, installing frame rotating device 40 and rotation shaft unit 30, the rotation connection driving rotation axis of rotation shaft unit 30 are distinguished in both ends
70, frame rotating device 40 be rotatablely connected rotating bezel 60, and keep rotation axis 70 and 60 rotation direction of rectangle rotating bezel on the contrary,
Right angle setting connection multiple (groups) stirs axis and mixes blade 80 in rotation axis 70, and all axis stirring blades 80 are rotated with rotation axis 70, turns
Also right angle setting connects multiple (group) frame stirring blades 90 for dynamic 60 inside of frame, and the framed stirring blade 90 of institute is rotated with rotating bezel 60,
Axis stirring blade 80 every and the every difference of frame stirring blade 90 are separately installed, and axis stirring blade 80 leaves in rotating bezel 60
Side wall certain distance, frame stirring blade 90 leave 70 certain distance of rotation axis；Cast hopper 10 is installed on 50 one end top of mix bucket, separately
One end lower part is equipped with discharge port 120,50 bottom mounting seat 100 of mix bucket and cast hopper 10 and separately sets secondary feeding port by near position
20 (can separately set multiple groups pair feeding port according to charging type), 10 lower part of cast hopper is equipped with spiral rotating piece 130, spiral rotating piece
130 have the driving of flight driving device 110, and determine charging rate (minute feeding quantity) according to driving revolving speed.Axis stirring blade
80 faces and rotation axis 70 are axially axially arranged with certain angle with all or part of blade face of frame stirring blade 90 and mix bucket,
So that into cylinder 50 mixture while stirring to 100 horizontal direction of discharge port generate thrust and towards 120 direction of discharge port
Mobile, frame stirring blade 90 can be straight stirring blade can also be arranged with same purpose and 50 axis direction of cylinder
Certain inclination angle.Axis stirring blade 80 and frame stirring blade 90 remain opposite direction rotation stirring, make to enter mix bucket 50
Mixture stirring it is more uniform.The mixture of mix is needed to pass through cast hopper 10 and secondary feeding port 20 respectively into mix bucket
50, mixture is sufficiently stirred under the positive and negative stirring of axis stirring blade 80 and frame stirring blade 90, and to 120 side of discharge port
It is discharged to transfer.
The application process of mixing device of the present invention illustrates: various mixtures enter mix bucket from hopper in certain proportion
Afterwards, axis stirring blade and the positive and negative repeated multiple times stirring mix of frame stirring blade are obtained in mix bucket rapidly, stirring mix is simultaneously
It is gradually shifted to discharge port direction under the helical structure blade promotion that those paddles are unilateral and mix bucket is axially in angle, row
It is transferred to after discharge port out and fills place.
Claims (10)
1. a kind of combination caisson foundation suitable for reinforced soft soil ground processing characterized by comprising several precast hollows
Tubular pole is vertically plugged in soft soil foundation with rectangular, quincunx or rectangle, and is managed interior soil after the plant of precast hollow tubular pole and taken out,
Tube top and tube bottom closing, the precast hollow tubular pole are cylindrical hollow body, the diameter D minimum value of precast hollow tubular pole by
Following formula obtains:
Wherein, K is that the material proportion of hollow body is；
D is the wall thickness of hollow body；
M is that weak soil specific gravity is m.
2. the combination caisson foundation according to claim 1 suitable for reinforced soft soil ground processing, which is characterized in that also wrap
Include reinforcing layer, the reinforcing layer is covered on planted precast hollow tubular pole after soft soil foundation upper surface.
3. the combination caisson foundation according to claim 2 suitable for reinforced soft soil ground processing, which is characterized in that described
The material of reinforcing layer is weak soil, foamed concrete or foaming mortar added with curing agent.
4. the combination caisson foundation according to claim 1 suitable for reinforced soft soil ground processing, which is characterized in that described
Hollow body is concrete reinforced pipe.
5. a kind of applied based on any combination caisson foundation suitable for reinforced soft soil ground processing in Claims 1 to 4
Work method, which is characterized in that including the following steps:
A, preparation of construction, production, maintenance, transport including precast hollow tubular pole are marched into the arena, equipment tissue is marched into the arena installation, levelling of the land
With the setting-out of stake position；
B, precast hollow tubular pole is lowered into soft soil foundation vertically according to determining stake position；
C, by precast hollow tubular pole after taking soil, single, batch or whole precast hollow tubular poles to sink in precast hollow tubular pole
Internal soil takes out；
D, the stake bottom of precast hollow tubular pole is closed, takes soil to terminate rear enclosed stake bottom in single, batch or whole precast hollow tubular poles；
E, the stake top of precast hollow tubular pole is closed, single, batch or whole precast hollow tubular pole stake underseals carry out closing stake after closing
Top.
6. being suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing, feature according to claim 5
It is, if after step E, the stake top height of each precast hollow tubular pole is identical with soft soil foundation ground level, then directly carries out
Top foundation construction；
If after step E, the stake top height of each precast hollow tubular pole is higher by soft soil foundation ground level, then, in soft soil foundation
Reinforcing layer is filled in gap on ground between each hollow stake top.
7. being suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing, feature according to claim 6
It is, the reinforcing layer adds cement or other curing agent to carry out mix with the soil taken out out of precast hollow tubular pole, after mix
Mixture fill gap between each tube top more than the ground of place.
8. being suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing, feature according to claim 5
It is, in step C, rotary digging is segmented using rotary digging device or is grabbed with grab bucket segmentation.
9. being suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing, feature according to claim 5
It is, bottom position is equipped with annular groove or lower circumference arranged for interval shrinkage pool, sealed tube bottom step in the precast hollow tubular pole
Suddenly tube bottom closing is carried out using concreting certain thickness.
10. being suitable for the construction method of the combination caisson foundation of reinforced soft soil ground processing, feature according to claim 7
It is, it includes: circle that the soil taken out out of precast hollow tubular pole, which adds cement or other curing agent to carry out the mixing device of mix,
Cast hopper is arranged in shape mix bucket one end top, and discharge port is arranged in other end lower part, and mix bucket inner shaft sets up rotation axis, mix
Setting connects multiple axis paddles on axial rotation and the rotating bezel opposite with rotation rotational axis direction, rotation axis in bucket
Piece connects multiple frame stirring blades on rotating bezel；Multiple axis stirring blades are vertically connected in rotation axis, are vertically connected on rotating bezel
Multiple frame stirring blades；Axis stirring blade and the interruption-like setting of frame stirring blade；The leaf of axis stirring blade and frame stirring blade
It is unilateral in a certain angle with the axial direction of mix bucket respectively；Rotary material feeder, including spiral rotating piece and drive are set on cast hopper
Dynamic device, driving device are rotatablely connected spiral rotating piece；Pair is set side by side at the cast hopper position entered in mix bucket to feed intake
Mouthful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910238715.3A CN110130385B (en) | 2019-03-27 | 2019-03-27 | Combined caisson foundation suitable for soft soil foundation reinforcement treatment and construction method thereof |
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|---|---|---|---|
| CN201910238715.3A CN110130385B (en) | 2019-03-27 | 2019-03-27 | Combined caisson foundation suitable for soft soil foundation reinforcement treatment and construction method thereof |
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| CN110130385B CN110130385B (en) | 2021-07-20 |
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| CN111945655A (en) * | 2020-08-19 | 2020-11-17 | 河海大学 | Construction ship and using method |
| CN111974246A (en) * | 2020-08-19 | 2020-11-24 | 河海大学 | Agitating lorry and using method |
| CN112854186A (en) * | 2021-03-24 | 2021-05-28 | 广东新江永安建设工程有限公司 | Soft soil foundation municipal road treatment method |
| CN114855754A (en) * | 2022-04-24 | 2022-08-05 | 四川省公路规划勘察设计研究院有限公司 | Novel structure of rotary digging pile sleeve mini-pile |
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| CN110130385B (en) | 2021-07-20 |
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