CN105019422B - Topsoil is cured in situ the foundation construction method that carrying is combined with stake - Google Patents
Topsoil is cured in situ the foundation construction method that carrying is combined with stake Download PDFInfo
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- CN105019422B CN105019422B CN201510302548.6A CN201510302548A CN105019422B CN 105019422 B CN105019422 B CN 105019422B CN 201510302548 A CN201510302548 A CN 201510302548A CN 105019422 B CN105019422 B CN 105019422B
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 61
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- 230000008569 process Effects 0.000 claims abstract description 23
- 239000004567 concrete Substances 0.000 claims abstract description 20
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- 239000010410 layer Substances 0.000 claims description 96
- 238000003756 stirring Methods 0.000 claims description 25
- 238000007711 solidification Methods 0.000 claims description 22
- 230000008023 solidification Effects 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 12
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Abstract
The foundation construction method that carrying is combined with stake, including step are cured in situ this application discloses a kind of topsoil：Cured skin soil；Pile foundation construction；Pile foundation hole is backfilled with not pre-hardening solidified earth, cement mortar or plain concrete；The application is also disclosed another topsoil and is cured in situ the foundation construction method for combining carrying with stake, and construction procedure is first to carry out pile foundation construction resolidification topsoil.Setting work and can intersecting progress for the generation of cured layer and mixing pile, complements each other, is not necessarily to secondary basement process, construction efficiency is high, lower than traditional mixing pile comparative cost.
Description
Technical field
This application involves a kind of method for processing foundation, in particular to a kind of topsoil is cured in situ the ground that carrying is combined with stake
Base processing method is suitable for processing weak soil, ultra-soft soil deep soft foundation engineering.
Technical background
With the fast development of the engineering constructions such as coastal port, industrial building, highway communication, especially some engineerings need to be built
It makes containing Deep Thick Soft Ground Area, weak soil is characterized in an important factor for influencing its compressive deformation in the high porosity in microstructure,
Lead to that weak soil compressibility is big, shearing strength is low and poor permeability, so need to reinforce to Deep Thick Soft Ground.
Currently, being divided into draining concretion method and composite foundation method to the reinforcement means of deep soft foundation.Discharging consolidation method side
Method is required to the long duration, and intensity raising has certain restriction.Relatively tightly and foundation bearing capacity is wanted for the duration
Relatively high area is asked generally to use the processing mode of vertical composite foundation.When vertical composite foundation progress pile foundation is set, ground
Surface should reach the bearing capacity that pile foundation is set.So topsoil water content is big when encountering, when the high silt soil of compressibility, the above place
Reason method cannot construct in process face.Currently used processing mode is that shallow-layer discharging consolidation and composite foundation combination are answered
Method for processing foundation, when shallow-layer vacuum preloading processing, need to spread a layer of clay work grid, geotextiles, manually carry out inserting modeling on it
Plate-laying only handles 4m or so, carries out the vacuum preloading of no bed course later, such method generally requires the 3-4 month, foundation bearing capacity
50kPa-55kPa is commonly reached, it is even lower.In order to meet the bearing capacity that pile foundation is set, generally need to also in process face sanding
Stone bed course then carries out the construction of composite foundation.
Meanwhile above method is both needed to using bed course during processing soft soil, bed course plays diffusion-induced stress and coordinates stake soil
The effect of deformation.Currently used sand-gravel cushion belongs to discrete material, does not have cohesive strength between particle and particle, causes in ground
When processing, deforms inconsistent between stake soil, lead to differential settlement, prevent differential settlement in light fill road, need
Densely covered pile increases engineering cost.And sand-gravel cushion generally uses the materials such as sand, stone, in recent years, due to largely opening for mountain stone
It adopts, causes the in short supply of resource, material cost is high；The natural calamity of landslide, mud-rock flow etc. is caused simultaneously.And the fortune of material
Defeated cost is also higher, to cause the cost of such processing method higher.It also will cause waste in transportational process, it also can be on the way
Environment causes different degrees of pollution.
In consideration of it, currently in order to the engineering of solution deep soft foundation, needs to apply for a kind of sand pad that can be replaced in conventional method
The method for processing foundation that layer is combined with stake can not only meet ground requirement for bearing capacity and guarantee ground uniform settlement but also rapid construction,
Save the novel foundation processing method of sand and stone resources.
Apply for content
A kind of topsoil of being designed to provide of the application is cured in situ the foundation construction method that carrying is combined with stake, to mention
The bearing capacity of high soft soil foundation reduces basement process expense, guarantees the uniform settlement of ground.
In order to achieve the above technical purposes, the application uses following technical scheme：
A kind of topsoil is cured in situ the foundation construction method that carrying is combined with stake, includes the following steps：
Step 1, cured skin soil；Native surface layer is carried out curing materials and in-situ soil on the spot using curing apparatus in situ
Solid stirring solidification, is allowed to form cured layer, and the intensity of cured layer is 60-1000kPa；
Step 2, pile foundation construction；When the bearing capacity of cured layer meet pile foundation construction equipment and personnel enter safely want
When asking, pile foundation is carried out on the cured layer sets construction；
When the intensity of cured layer is more than 1000kPa, when so that pile foundation can not be set, pilot hole should be first carried out near pile foundation
And local excavation, after being set to pile foundation because caused by pilot hole and local excavation hole carry out curing process again；
Step 3, backfill or stirring；After pile foundation is set, use not pre-hardening solidified earth, cement mortar or plain concrete
To stayed in because setting pile foundation the hole on cured layer carry out backfill or to within the scope of 0.2-1 times of Pile Diameter by broken
Bad cured layer is stirred solidification again, it is made to be connected to become entirety with not destroyed cured layer.
Cured layer with a thickness of 0.5-3.0m in the step 1.
The mode that cured layer is formed in the step 1 is that in-situ soil, machinery is stirred up and down vertically using equipment is cured in situ
It mixes solidification or rear resolidification is turned over using layering stirring pine.
The step 2 pile foundation is one or any two kinds of the combination of flexible pile or rigid pile, and wherein rigid pile is
Prefabricated pile, in situ concrete pile or plastic sleeve concrete pile, before setting rigid pile, first with steel plate or prefabricated components by stake
Top seals up；During setting rigid pile, there are the gaps of 5-20cm with cured layer bottom for pile foundation upper end, then with concrete or
Pre-hardening solidified earth back-filling in layers does not stay in the hole on cured layer because setting pile foundation.
The step 2 pile foundation is one or any two kinds of the combination of flexible pile or rigid pile, and wherein flexible pile is
Cement mixing pile or other cement earth piles during setting flexible pile, are in flexible pile upper end in cured layer, make pile body and consolidate
Change layer to be completely embedded, and pile foundation top is higher by cured layer bottom 5-30cm；Continue to carry out again upper earthing with mixing plant later
Secondary curing process, and expand the range of stirring.
When being backfilled in the step 3 with not pre-hardening solidified earth, using the method for being layered the compacting that paves, formation is fallen
Trapezium structure.
A kind of topsoil is cured in situ the foundation construction method that carrying is combined with stake, includes the following steps：
Step A, pile foundation construction, when the bearing capacity of in-situ soil meets the requirement of pile foundation construction equipment and personnel entered safely
When, pile foundation is carried out in the in-situ soil sets construction；
Step B, cured skin soil first use curing apparatus to carry out curing materials and soil layer in situ on the spot on weak soil surface layer
Solid stirring solidification, is allowed to form cured layer.
The mode that cured layer is formed in the step B is that soil layer in situ, machinery is stirred up and down vertically using equipment is cured in situ
It mixes solidification or rear resolidification is turned over using layering stirring pine.
The step A pile foundation is one or any two kinds of the combination of flexible pile or rigid pile, and wherein flexible pile is
Cement mixing pile or other cement earth piles, rigid pile are prefabricated pile, in situ concrete pile or plastic sleeve concrete pile, are set just
Property stake before stake top is sealed with steel plate or prefabricated components.
The application has the following advantages that by adopting the above technical scheme：
（1）Topsoil be cured in situ can use curing apparatus injection curing agent and topsoil once stirred at design thickness
Completion is mixed, while replacing the sand bedding course in conventional procedure, project cost is reduced, economizes on resources, while playing holding for different pile foundations
Load feature.
（2）It is that soil body curing agent is chemically reacted with native Minerals that topsoil, which is cured in situ the cured layer formed after processing,
The plate body of formation has certain cohesiveness, can give full play to the characteristic of inter-pile soil, and load-carrying properties improve.
（3）Topsoil, which is cured in situ the cured layer to be formed, can satisfy artificial and mechanical equipment bearing capacity, apply to be subsequent
The development of work provides job platform.
（4）Setting work and can intersecting progress for the generation of cured layer and mixing pile, complements each other, without at secondary ground
Reason, construction efficiency is high, lower than traditional mixing pile comparative cost.
Detailed description of the invention
Fig. 1 shows that topsoil is cured in situ the foundation structure that carrying is combined with stake；
Fig. 2 is that topsoil is cured in situ the work progress that the foundation structure of carrying is combined with stake；
Fig. 2-a is the work progress that topsoil is cured in situ；
Fig. 2-b is the process of the construction stake on cured layer；
Fig. 2-c is that topsoil is cured in situ the schematic diagram that the foundation structure construction completion of carrying is combined with stake；
Fig. 3 is the connection for stirring stake top and cured layer；
Fig. 4 is the connection of prefabricated pile or plastic sleeve concrete pile stake top and cured layer；
Fig. 5 is the overall structure of mixing plant；
Fig. 6 is the overall structure of blade mechanisms；
Main mark is described as follows in attached drawing：1- curing process region；2- cured layer；3- in-situ soil；4- pile foundation；5- holding force
Layer；6- curing apparatus；7- curing agent automatic ration feeder apparatus；8- conveying pipeline；9- stirring-head；10- pile body construction machinery；11-
Set equipment；12- filling soil.
Specific embodiment
The mode for forming cured layer 2 is determining according to the intensity of soil layer 3 in situ, can benefit when 3 intensity of soil layer in situ is lower
With 6 pairs of the curing apparatus vertical mechanical stirring curing process up and down of soil layer 3 in situ；When curing apparatus 6 can not directly handle in-situ soil
9 mechanical stirring pine of stirring-head can be used when layer 3 and turn over multi-shell curing.
If shallow-layer be cured as piling machinery smooth construction provide job platform, curing depth can be controlled in 0.5 ~ 3.0m it
Between, can satisfy the requirement for bearing capacity of mechanical equipment, solidify soil layer 2 without lateral confinement strength control in 60 ~ 1000kPa or so
Meet the requirement that pile foundation is set.
In the sequence of construction of the application, can be constructed pile foundation 4 again using first construction and solidification layer 2, can also be used and first be constructed
The mode of the construction and solidification layer 2 again of pile foundation 4, embodiment 1-3 are that first construction and solidification layer 2 is constructed the construction method of pile foundation 4 again, embodiment
4 for first construction pile foundation 4 construction and solidification layer 2 again construction method.
Embodiment 1
When pile foundation 4 is cement mixing pile, the method for processing foundation is：
As shown in Fig. 2, soil layer 3 in situ is carried out smooth location, and curing process region 1 is carried out in soil layer 3 in situ
It divides, solidification construction equipment 6 is driven into predeterminated position, by curing agent automatic ration feeding system 7 and conveying pipeline 8, solidification
Material is transported to the stirring-head 9 solidified in construction equipment 6, and the cured layer 2 of 2.0m thickness is formed in curing process region 1.?
The cured layer 2 of completion can carry out the construction of cement mixing pile above, and cured layer intensity should control between 60kPa-1000kPa,
Stake spacing is 3.1m, and processing depth is 20m.
When 2 intensity of cured layer is higher, pile foundation 4 be can not be successfully when squeezing into, and be can be used and is first carried out pilot hole and mechanical local excavation
It sets pile foundation 4 smoothly, curing process is carried out to upper earthing body with mixing plant again later.
When being cured in situ processing and cement mixing pile is set when cannot carry out simultaneously, cured layer intensity is higher at this time, pile foundation 4
Cannot smoothly set, the topsoil in 4 position range of pile foundation can be used without solidification, pile body set after again to this part
Carry out curing process.
It is shorter when the duration, when needing to carry out the construction of pile foundation 4 immediately, to meet rapidly entering for machinery, shallow-layer can be increased
Curing depth, or early strength agent or retarder are added on the basis of conventional solidified dose simultaneously.
As shown in Fig. 2, first using curing apparatus that curing materials and soil layer progress in situ are disposable on the spot on weak soil surface layer
Solid stirring solidification, is allowed to form cured layer.By pile body construction machinery 10 and mixing plant 11, in hardened cured layer
By stirring material by automatic ration feeding system 7 on 2, stirring material and soil layer 3 in situ are stirred shape on the position of design
At cement mixing pile, cement mixing pile, which is stirred to the above 5-30cm in 2 design thickness bottom of cured layer, to be stopped, again with mixing plant later
Secondary to be again stirring for above covering solidified earth, when stirring, expands stirring range, as shown in figure 3, in order to cured good with other
Soil coheres Cheng Yiti, avoids damage to, and is stirred using step.Original position as shown in Figure 1 is ultimately formed to be cured in situ and cement
The foundation structure of mixing pile combination carrying.
Embodiment 2
When pile foundation 4 is prefabricated pile, foundation construction method：
Such as Fig. 2, soil layer 3 in situ is subjected to smooth location, and curing process region 1 is divided in soil layer 3 in situ,
Drive solidification construction equipment 6 into predeterminated position, it is by curing agent automatic ration feeding system 7 and conveying pipeline 8, curing materials are defeated
It is sent to the stirring-head 9 solidified in construction equipment 6, forms the cured layer 2 of 1.7m thickness in curing process region 1.Then, complete
At cured layer 2 can carry out the construction of prefabricated pile above, cured layer intensity should control between 60kPa-1000kPa, stake spacing
For 3.0m, processing depth is that 20m consolidates as shown in Fig. 2, by pile body construction machinery 10 and setting equipment 11 in hardened
The pile foundation for changing progress end part seal on layer 2 is set, and is carried out using steel plate or prefabricated components to the cavity of prefabricated pile before setting
Sealing, so as not on cover sealing material and enter inside prefabricated pile.Prefabricated pile is set to 5cm-20cm below 2 design thickness bottom of cured layer
Stop, being carried out being backfilled to the design of cured layer 2 bottom later with filling soil 12, expand when being backfilled with filling soil 12 and backfill range（Such as
Fig. 4）, it is preferable that filling soil 12 is not pre-hardening solidified earth, cement mortar or plain concrete, is ultimately formed as shown in Figure 1
Original position is cured in situ the foundation structure that carrying is combined with prefabricated pile.
Embodiment 3
When pile foundation 4 is plastic sleeve concrete pile, foundation construction method：
As shown in Fig. 2,2-a, 2-b, 2-c, by soil layer 3 in situ carry out smooth location, and in situ in soil layer 3 to solidification at
Reason region 1 is divided, and is driven solidification construction equipment 6 into predeterminated position, is passed through curing agent automatic ration feeding system 7 and conveying
Pipe 8 is transported to curing materials the stirring-head 9 solidified in construction equipment 6, and consolidating for 2.0m thickness is formed in curing process region 1
Change layer 2.Then, can carry out the construction of plastic bushing on completed cured layer 2, construct plastic bushing when, need to design
Length top adds a segment elongation pipe, and the length of extension tubing should be greater than cured thickness.
As shown in Fig. 2, according to design length, such as 20m by pile body construction machinery 10 and sets equipment 11, firmly
Plastic bushing construction is carried out on the cured layer 2 of change, is poured later with concrete, is poured to solidification design thickness bottom
10cm-15cm, extension tubing is pulled out in stopping, after concrete setting, being backfilled to not pre-hardening solidified earth or plain concrete
Cured layer designs bottom, and when use not pre-hardening solidified earth back-filling in layers expands backfill range（Such as Fig. 4）, ultimately form such as Fig. 1
Shown in be cured in situ in situ with plastic sleeve concrete pile close carrying foundation structure.
Embodiment 4
This embodiment is the sequence of construction of construction and solidification layer 2 after first constructing pile foundation 4, and the pile foundation 4 is also flexible pile or rigid
Property stake one or any two kinds of combination, wherein flexible pile be cement mixing pile or other cement earth piles, rigid pile is pre-
Stake, in situ concrete pile or plastic sleeve concrete pile processed.
When pile foundation 4 is prefabricated pile, foundation construction method：
Step A, the construction of pile foundation 4, when the safety that the bearing capacity of soil layer 3 in situ meets pile foundation construction equipment and personnel enters
Requirement when, carry out pile foundation 4 on the original position soil layer 3 and set construction；
Certain foundation bearing capacity is needed because construction of prefabricated piles equipment is set, if the bearing capacity of soil layer 3 in situ meets stake
When the requirement of base construction equipment and personnel entered safely, stake machine is positioned, is then set, the process of piling ensures
Stake is sent under the bottom surface absolute altitude of cured layer at 5-20cm, enhance process control and record, inspection by the verticality of stake using Pile feeder
Pile length, verticality and stake top absolute altitude.
Step B, cured skin soil, the use of 3 surface of soil layer is cured in situ equipment and carries out on vertical to soil layer 3 in situ in situ
Lower mechanical stirring, which solidifies or the stirring-head of curing apparatus 6 is used to carry out layering stirring pine, turns over rear resolidification, is allowed to form cured layer
2。
As shown in figure 5, a kind of mixing plant, including mixing arm, mixing arm two sides of the bottom have intilted two inclined-plane,
At least one mixing roller bearing is respectively arranged on each inclined-plane, mixing roller bearing is driven by driving equipment to be rotated, and mixing roller bearing is in
Frustroconical；Blade mechanisms are distributed on the mixing roller bearing；The curing agent of extension type is installed inside the mixing arm
Conveying pipeline.
Preferably, the end of the curing agent conveying pipeline is provided with spraying device.When mixing plant processing surface location is adopted
When with curing agent being pulvis, in order to avoid environmental pollution, in due course beginning spraying device.Spraying device in use, will not with it is solid
Agent occurs chemical reaction liquid and is added in spraying device, and the content of the liquid is usually 4-8% of solid or so.
Mixing roller bearing is designed to that in frustroconical be to reduce the frictional resistance in whipping process between the soil body.Solidification
Agent conveying pipeline is designed to extension type, the pollution of curing agent when can reduce surface stirring.
Preferably, blade mechanisms are distributed on mixing roller bearing in one-way spiral type, and mixing roller bearing rotation rotates model after a week
The soil body in enclosing can be contacted and be disturbed, and can continuously be stirred without blind spot solid, and the uniformity of mixture after stirring, and one are improved
Secondary property processing depth reaches 3m.
As shown in fig. 6, the blade mechanisms include the fixed plate being set on mixing roller bearing and are set in fixed plate
Two orthogonal blades one and blade two.Blade was second is that in order to destroy ground soil structure, blade one was used for stirring
Cheng Zhong cuts in-situ soil using blade two, is carried out later using blade one and mixing roller bearing to the in-situ soil of destroyed
Stirring, helically type is distributed on mixing roller bearing blade mechanisms, may be implemented to stir soil body solid.
Before being cured in situ, stake top need to be closed using steel plate or concrete（Purpose is that the top soil body is not allowed to fall into
Among tubular pole）.Later according to design thickness, curing process is carried out using curing apparatus 6（It should be noted：There is portion existing for tubular pole
Position, when being constructed using strong mixer, to avoid the Mixing Machine of curing apparatus from influencing tubular pole, stirring can when solidifying
Suitably with a distance from 5-20cm at the top of tubular pole or so, after reaching design thickness, precompressed maintenance is carried out.
The application can also be used in combination with geosynthetics, TGXG and geotextiles etc..
Above-mentioned specific embodiment does not limit the technical solution of the application in any form, all to use equivalent replacement or wait
The mode technical solution obtained of effect transformation all falls within the protection scope of the application.
Claims (1)
1. a kind of topsoil is cured in situ the foundation construction method for combining carrying with stake, which is characterized in that include the following steps：
Step 1, cured skin soil；Soil layer in situ is subjected to smooth location, and curing process region is carried out in soil layer in situ
It divides, solidification construction equipment is driven into predeterminated position, by curing agent automatic ration feeding system and conveying pipeline, curing materials
It is transported in solidification construction equipment, when soil layer intensity in situ is lower, using curing apparatus, to soil layer in situ, machinery is stirred up and down vertically
Mix curing process；Multi-shell curing is turned over using stirring-head mechanical stirring pine when curing apparatus directly can not handle soil layer in situ,
In-situ soil surface layer is formed with a thickness of 0.5-3.0m, and intensity is the cured layer of 60-1000kPa；
Step 2, pile foundation construction；When the bearing capacity of cured layer meets the requirement of pile foundation construction equipment and personnel entered safely,
Pile foundation is carried out on the cured layer sets construction；
When pile foundation is rigid pile, which is prefabricated pile, in situ concrete pile or plastic sleeve concrete pile, sets rigidity
Before stake, first stake top is sealed up with steel plate or prefabricated components；During setting rigid pile, pile foundation upper end and cured layer bottom
There are the gaps of 5-20cm, are carried out being backfilled to cured layer design bottom later with filling soil, expand when with filling earthen backfill and backfill
Range forms step and backfills structure；
When pile foundation is flexible pile, which is cement mixing pile, during setting flexible pile, flexible pile upper end is made to be in solid
Change in layer, is completely embedded pile body with cured layer, and pile foundation top is higher by cured layer bottom 5-30cm, again with mixing plant later
Secondary to be again stirring for above covering solidified earth, when stirring, expands stirring range, forms step stirring；
When the intensity of cured layer is more than 1000kPa, when so that pile foundation can not be set, pilot hole drawn game should be first carried out near pile foundation
Portion is excavated, after being set to pile foundation because caused by pilot hole and local excavation hole carry out curing process again；
Step 3, backfill or stirring；After pile foundation is set, use not pre-hardening solidified earth, cement mortar or plain concrete to because
It sets pile foundation and stays in the hole on cured layer and carry out backfill or to be destroyed within the scope of 0.2-1 times of Pile Diameter
Cured layer is stirred solidification again, it is made to be connected to become entirety with not destroyed cured layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510302548.6A CN105019422B (en) | 2015-06-04 | 2015-06-04 | Topsoil is cured in situ the foundation construction method that carrying is combined with stake |
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| CN201510302548.6A CN105019422B (en) | 2015-06-04 | 2015-06-04 | Topsoil is cured in situ the foundation construction method that carrying is combined with stake |
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| CN105019422A CN105019422A (en) | 2015-11-04 |
| CN105019422B true CN105019422B (en) | 2018-11-16 |
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| CN111877302B (en) * | 2020-08-25 | 2021-09-10 | 广东劲拓建设工程有限公司 | Foundation construction method for in-situ solidification of surface soil and pile combined bearing |
| CN112195909A (en) * | 2020-10-20 | 2021-01-08 | 云南建投第一勘察设计有限公司 | Method for reinforcing soft foundation of road and parking lot |
| CN112962608B (en) * | 2021-02-25 | 2022-08-05 | 江苏地基工程有限公司 | Method for reducing bending damage of pipe pile in soft soil |
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