CN201738324U - Project pile deflection prevention structure used on soft soil foundation - Google Patents
Project pile deflection prevention structure used on soft soil foundation Download PDFInfo
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- CN201738324U CN201738324U CN2010201840085U CN201020184008U CN201738324U CN 201738324 U CN201738324 U CN 201738324U CN 2010201840085 U CN2010201840085 U CN 2010201840085U CN 201020184008 U CN201020184008 U CN 201020184008U CN 201738324 U CN201738324 U CN 201738324U
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- 239000002689 soil Substances 0.000 title abstract description 24
- 230000002265 prevention Effects 0.000 title abstract 3
- 238000010276 construction Methods 0.000 claims description 39
- 239000004568 cement Substances 0.000 claims description 22
- 238000013019 agitation Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 abstract description 23
- 238000005728 strengthening Methods 0.000 abstract description 3
- 238000002203 pretreatment Methods 0.000 abstract 2
- 239000002002 slurry Substances 0.000 description 13
- 238000009412 basement excavation Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The utility model relates to a project pile deflection prevention structure used on soft soil foundation and a pretreatment method. The utility model is characterized in that a strengthening structure is arranged around a project pile, and includes a plurality of stirring piles continuously arranged around a bearing platform to present a grating structure, wherein the stirring piles have the same heights as the project pile, and the depths of the stirring piles are 1.2-1.4 times of the depth of a foundation pit, and the strengthening structure is arranged within the 2/3-3/4 foundation pit range by taking the foundation pit as the center. Compared with the prior art. The project pile deflection prevention structure used on soft soil foundation and the pretreatment method can efficiently prevent deflection of the project pile when the soft soil foundation is excavated to form the foundation pit.
Description
Technical field
The utility model relates to building field, specifically refers to a kind of soft foundation excavation of foundation pit preventing engineering stake off-set construction.
Background technology
Existing building is more effective space that utilizes, and majority is provided with basement.During engineering construction, need first engineering piles, in engineering, use, finally build, stressed stake of working in the structure.Engineering piles is the stake that is used on the engineering entity, bear certain load, and test pile is done detection design and used, if bigger engineering will be done test pile separately, if important engineering not too is also passable with doing on the entity.
The coastal area soft foundation is generally based on mud or mucky soil, and such native liquidity index is big, is in stream and moulds state, and shear strength is low, compressibilty is higher, permeability is less.Practice shows that the construction quality and the off normal of general ground engineering piles are controlled than being easier to.But in soft foundation; the engineering piles of construction usually the off normal construction quality problem can occur, and promptly the position is errorless during pile sinking, and the intermediate acceptance before the pile follower is also no problem; but after coming out, excavation finds part engineering piles position off normal, sometimes or even large-area off normal.This mainly contains following several aspect and causes:
1) the soil compaction reason causes an off normal, because when ground is squeezed in stake, no matter be that always some or whole soil bodys are extruded the position of pile body for the stake of pile tube or other type, cause near the displacement of the soil body of pile body, the corresponding superposition of its displacement of increase along with the pile sinking number, cause the engineering piles of having constructed with land movement, the density of stake is close more, and then Zhuan off normal is big more.
2) under the effect of excess pore water pressure, the soil body produces displacement; Weak saturated mud and mucky silt, its water permeability is poor.In pile driving process, when producing pile body casting and land movement, form very high excess pore water pressure in the soil body.If this excess pore water pressure that increases rapidly, before excavation of foundation pit, in time do not obtain dissipating, work as excavation of foundation pit, the part soil body is excavated, stress in the foundation soil loses original balance, and under the effect of excess pore water pressure, the soil body produces displacement, even cause the unstability of excavation slope and foundation ditch bottom to gush soil and soil body slip, cause the off normal even the fracture of engineering piles thus.
Biased the moving mainly of stake taken place and owing to lateral earth pressure increases soil body generation displacement caused in 3) soil excavation construction infection.As the disturbance of large-scale construction equipment to the soil body, the side slope design is unreasonable, and soil excavation is too early or the like.Simultaneously because the soil compaction effect in the preformed pile formation of pile, and along with the continuous increase of pile quantity, the stress of being put aside in the soil is increasing, and local stress discharges the off normal that is easy to cause stake in excavation.
Because ground processing in early stage input cost is big, the time is long, and the difficult quality to the stake off normal in excavation of foundation pit guarantees fully, brings bigger economy and qualitative loss for follow-up processing.Therefore, how preventing the generation of engineering piles off normal, is that engineering is paid close attention to.
Summary of the invention
Technical problem to be solved in the utility model is that the present situation at prior art provides a kind of soft foundation excavation of foundation pit preventing engineering stake off-set construction.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: this soft foundation preventing engineering stake off-set construction, it is characterized in that around engineering piles, being provided with ruggedized construction, described ruggedized construction comprises that a plurality of cushion caps that center on are the continuously arranged cement mixing method of cell structure, the stake top mark of described agitation pile is high concordant with absolute altitude at the bottom of the foundation ditch, the degree of depth of agitation pile is 1.2-1.4 a times of foundation depth, and it is the 2/3-3/4 foundation ditch scope at center that described ruggedized construction is positioned at described foundation ditch central authorities, near the peripheral part of pattern foundation pit supporting structure because the existence of pattern foundation pit supporting structure can not need or a little is reinforced, certainly to needs consider that foundation pit supporting construction passive area soil reinforces except.
Described agitation pile can cushion cap be that well head is roughly the arrangement of " well " font structure.
Preferably, described agitation pile can be Φ 700@600 cement mixing pile.
The pile position deviation of described agitation pile preferably is not more than 50mm, and vertical missing is not more than 1.0%.
In above-mentioned each scheme, in the described ruggedized construction between adjoining two agitation piles part superimposed.
Compared with prior art, engineering piles off normal when the utility model can effectively prevent the soft foundation excavation of foundation pit, practicality rational in infrastructure is implemented to make easily, and is effective.
Description of drawings
Fig. 1 to Fig. 3 is the floor map of three kinds of ruggedized constructions among the utility model embodiment.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
1, determines Scheme of Strengthening.
As shown in Figure 1 to Figure 3, it is in the about 2/3-3/4 foundation ditch scope of center that ruggedized construction in this soft foundation preventing engineering stake off-set construction is arranged on foundation ditch central authorities, comprise a plurality of agitation piles 1, these agitation piles are to be centered around around the cushion cap 3 on substantially, show cushion cap greatly and be that well head is approximate " well " that font is arranged, form reinforcing block continuous, grid type, engineering piles 2 is arranged on the corner of its corresponding cushion cap 3.The reinforcing block of corresponding a plurality of cushion caps also can be independent separately.
Cushion cap as described in Figure 1 is triangle roughly, and described engineering piles has three, all is arranged on each corner location of described cushion cap, also is provided with between each engineering piles each engineering piles two two isolated agitation piles.
Cushion cap as shown in Figure 2 is square, and engineering piles has four, all is arranged on each corner location of described cushion cap, is provided with between the adjoining engineering piles both isolated agitation piles.
Cushion cap as described in Figure 3 is rectangle, and engineering piles has two, is arranged on two side positions of described cushion cap, and ruggedized construction is " well " font.
The degree of depth of agitation pile 1 is 1.3 times of foundation depth, adopts Φ 700@600 cement mixing pile.Cement mixing pile stake top mark height is an absolute altitude at the bottom of the foundation ditch.
2, material and equipment.
Main material: cement adopts the general portland cement of 42.5R level; Construction water adopts the municipal tap water; Additive is selected gypsum powder for use.Main construction equipment is as shown in table 1.
Table 1
| Title | Specification | Quantity | Power (KW) | Purposes |
| The cement mixing pile machine | SGH-16 | 7 | 2×30 | Piling |
| Extrusion pump | HB6-3 | 14 | 2.2 | Defeated slurry |
| Grout mixer | HL-1 |
1 | 2.2 | Cement paste is mixed |
| Concrete mixer | JZC-350 | 1 | 5.5 | Concrete stirs |
| Submersible pump | QSR-15 | 4 | 1.5 | Draining |
| Level gauge | S-3 | 2 | - | Measure |
| Total powerstation | RTS-632H | 1 | - | Measure |
3, main construction sequence and technology
Construction sequence: the slag packing course → agitation pile location → system cement paste → whitewashing of delaying when cutting out former pile sinking stirs → and promote → repeat whitewashing to stir → repeat to promote until aperture → close mixer, cleaning → move to next pile, repeat above operation.
Concrete soft foundation preventing engineering stake off normal preprocess method is as follows:
(1) location centering: crane suspention mixer arrives specifies the stake position, and centering does not make drilling rod keep vertical with the level ground if ground should not be regulated screw mandrel at ordinary times.
(2) preparation curing compound slurries: system curing compound slurries are mixed on the backstage, treat before the mud jacking slurries to be poured in the aggregate bin.
(3) stir sinking in advance: start mixer motor, treat that the stirring-head rotating speed loosens hoisting wirerope after normal, mixer is sunk while stirring along leading truck, sink down into a top mark when high, open extrusion pump, make host header stir the projected depth that sinks down into regulation while whitewashing along leading truck.
(4) stirring promotes: deep mixer is closed extrusion pump after sinking to arriving projected depth, and the stirring drill bit begins stirring and is promoted to a whitewashing stake top mark height.
(5) repeating whitewashing stirs: when mixer is promoted to design end face absolute altitude, open extrusion pump again, the limit whitewashing sinks down into projected depth while stirring, and this moment, every pile cement consumption should just be used up.
(6) repeat to promote: after the stirring drill bit sinks down into projected depth, be promoted to ground then while stirring.
(7) displacement: repeat above-mentioned six steps and carry out the construction of next pile.
(8) close Mixing Machine, be displaced to new reinforcement point.
4, quality control standard.
(1) adopt Φ 700@600 cement mixing pile, it is 8% that cement mixing content 15%, sky stir the part cement mixing content, adopts 42.5R level ordinary portland cement, water/binder ratio 0.5.Admixture gypsum powder, volume are 2.0% of cement mixing content; The mixing pile construction hoisting velocity is controlled in the 0.8m/min.The cement mixing pile maintenance begins the basement earthwork construction after 14 days.
(2) for guaranteeing the verticality of cement mixing pile, note lifting by crane the planeness of mixing plant and the verticality of leading truck, the pile position deviation of cement mixing method is not more than 50mm, and vertical missing is not more than 1.0%, stirs rising or falling speed and is not more than 0.5m/min.
(3) cement mixing pile should be constructed continuously, and must not surpass 24h blanking time, can't overlap as long causing of blanking time, should adopt remedial measures.
(4) construction technology of cement mixing pile is the long even whitewashing of full stake of " four stir two sprays ".Whitewashing can't use up cement paste as secondary, can repeatedly whitewash.
(5) before stirring-head is cut soil sinking arrival stake end, filter clean cement grout and be transported to stake end and (note: the construction parameter operation of confirming according to test pile mixing, stirring-head is cut soil and is sunk to arriving the stake end, slurries also should arrive the stake end simultaneously), mortar pump pressure is controlled in 0.4～0.6MPa scope, and stirring hoisting velocity should be synchronous with defeated slurry speed.
(6) before working start every day, should measure the stirring-head blade diameter earlier and whether reach 700mm, stir when blade has wearing and tearing and should in time add weldering, prevent that the stake footpath is less than normal.
(7) stir in advance when sinking and to wash by water,, can suitably wash by water, dwindle slurry water gray scale or increase and mix method such as slurries and remedy the influence of bath pile strength but use when running into than hardpan to sink when too slow.
Stop slurry when (8) constructing for some reason, stirring-head should be sunk down into and stop the following 1.0m of a slurry point place, the lifting of whitewashing again when waiting to recover to supply slurry.If shut down more than 3 hours, should dismantle grout pipe line, clean up plugging when preventing to recover construction.
(9) for guaranteeing a stake end stake top application working medium amount, after slurries reached grout outlet, a 30s at the bottom of should whitewashing made slurries arrive the stake end fully; When drill bit is promoted to a top mark when high, should stop to promote, stir the several seconds again, evenly closely knit to guarantee pile crown.
Claims (6)
1. soft foundation preventing engineering stake off-set construction, it is characterized in that around engineering piles, being provided with ruggedized construction, described ruggedized construction comprises that a plurality of cushion caps that center on are the continuously arranged cement mixing method of cell structure, the stake top mark of described agitation pile is high concordant with absolute altitude at the bottom of the foundation ditch, the degree of depth of agitation pile be foundation depth 1.2-1.4 doubly, and described ruggedized construction to be positioned at described foundation ditch central authorities be the 2/3-3/4 foundation ditch scope at center.
2. soft foundation preventing engineering stake off-set construction according to claim 1 is characterized in that described agitation pile is that well head is roughly the arrangement of " well " font structure with the cushion cap.
3. soft foundation preventing engineering stake off-set construction according to claim 2, it is characterized in that described cushion cap is triangle roughly, described engineering piles has three, all is arranged on each corner location of described cushion cap, also is provided with between each engineering piles each engineering piles two two isolated agitation piles; Perhaps described cushion cap is square, and described engineering piles has four, all is arranged on each corner location of described cushion cap, is provided with between the adjoining engineering piles both isolated agitation piles; Perhaps described cushion cap is rectangle, and engineering piles has two, is arranged on two side positions of described cushion cap.
4. soft foundation preventing engineering stake off-set construction according to claim 1, its feature at described agitation pile is
The 700@600 cement mixing pile.
5. soft foundation preventing engineering stake off-set construction according to claim 4 is characterized in that the pile position deviation of described agitation pile is not more than 50mm, and vertical missing is not more than 1.0%.
6. according to the described soft foundation preventing engineering of the arbitrary claim of claim 1 to 5 stake off-set construction, it is characterized in that part is superimposed between two adjoining in described ruggedized construction agitation piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201840085U CN201738324U (en) | 2010-05-07 | 2010-05-07 | Project pile deflection prevention structure used on soft soil foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201840085U CN201738324U (en) | 2010-05-07 | 2010-05-07 | Project pile deflection prevention structure used on soft soil foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201738324U true CN201738324U (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201840085U Expired - Lifetime CN201738324U (en) | 2010-05-07 | 2010-05-07 | Project pile deflection prevention structure used on soft soil foundation |
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| Country | Link |
|---|---|
| CN (1) | CN201738324U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235008A (en) * | 2010-05-07 | 2011-11-09 | 浙江海洋学院 | Engineering pile deviation preventing structure of soft soil foundation and pretreatment method |
| CN103046574A (en) * | 2013-01-28 | 2013-04-17 | 中国水电顾问集团西北勘测设计研究院 | Four-leaf-clover-type concrete bearing platform and prestressed pipe foundation structure of soft foundation fan |
-
2010
- 2010-05-07 CN CN2010201840085U patent/CN201738324U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235008A (en) * | 2010-05-07 | 2011-11-09 | 浙江海洋学院 | Engineering pile deviation preventing structure of soft soil foundation and pretreatment method |
| CN103046574A (en) * | 2013-01-28 | 2013-04-17 | 中国水电顾问集团西北勘测设计研究院 | Four-leaf-clover-type concrete bearing platform and prestressed pipe foundation structure of soft foundation fan |
| CN103046574B (en) * | 2013-01-28 | 2015-09-16 | 中国电建集团西北勘测设计研究院有限公司 | A kind of soft damage blower fan four leaf plum type concrete bearing platform prestressed pipe foundation structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110209 Effective date of abandoning: 20130424 |
|
| RGAV | Abandon patent right to avoid regrant |