CN110029666A - For mini pile to resist swelled ground protection mould and production and preparation method thereof - Google Patents
For mini pile to resist swelled ground protection mould and production and preparation method thereof Download PDFInfo
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- CN110029666A CN110029666A CN201910447190.4A CN201910447190A CN110029666A CN 110029666 A CN110029666 A CN 110029666A CN 201910447190 A CN201910447190 A CN 201910447190A CN 110029666 A CN110029666 A CN 110029666A
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- inner template
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- reinforcement cage
- steel reinforcement
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 230000002787 reinforcement Effects 0.000 claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000009415 formwork Methods 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 26
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims description 62
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 229920006327 polystyrene foam Polymers 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000009189 diving Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 230000010339 dilation Effects 0.000 description 2
- 229910052900 illite Inorganic materials 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 2
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
Classifications
-
- 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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
-
- 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
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
-
- 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
- E02D5/60—Piles with protecting cases
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses protect mould and production and preparation method thereof for mini pile to resist swelled ground, comprising: an exterior sheathing is hollow and up big and down small bullet；One steel reinforcement cage is bound by a plurality of reinforcing bar, is layed in exterior sheathing inner wall, and shape is consistent with exterior sheathing；One inner template is hollow and up big and down small bullet, is located inside steel reinforcement cage；One positioning ring is welded in the middle part of inner template, is formed by a plurality of reinforcement welding, and in hollow and up-small and down-big bullet, mini pile is passed through and positioned to mini pile when for constructing；One formwork for cylindrical columns extends vertically through exterior sheathing, positioning ring, steel reinforcement cage and inner template setting；The present invention is by setting positioning ring, so that inner template is easier to pull out, and is adjusted the posture of entire mold, avoids formwork for cylindrical columns from being biased to two sides, and then influence the thickness of protective；The protective that the present invention produces, size, posture and shape are uniform, are suitble to large-scale production.
Description
[technical field]
The invention belongs to preventing land slide and pile foundation engineering fields, and more particularly, to mini pile is to resist swelled ground protective
Mold and production and preparation method thereof.
[background technique]
Swelled ground (expansive soil) is also known as " dilative soil ".Volume acutely expands after immersion, and volume is aobvious after dehydration
Write the cohesive soil shunk.Due to containing the clay minerals such as more montmorillonite, illite in soil, therefore hydrophily is very strong.When natural
When moisture content is higher, the swell increment and expansive force after immersion are smaller, and the shrinkage after dehydration and convergent force are then very big；Naturally
When void ratio is bigger, swell increment is smaller with expansive force, and shrinkage and convergent force are then big.This kind of soil will cause seriously building
Harm, but intensity is generally higher under native state, and compressibility is low, is easily erroneously interpreted as preferable ground.It is Chinese yunnan, expensive
There is the distribution of different range on the ground such as state, Sichuan, Guangxi, Hebei, Henan, Hubei, Shaanxi, Anhui and Jiangsu.To expansion soil
Base should carry out antiseepage and the drainage measure of earth's surface, also breathe out suitably to increase foundation load and depth of foundation and improve building
Rigidity simultaneously sets subsiding crack；Or excavate the swelled ground within the scope of supporting course, with sand or other unexpansive earthen backfills.
The shallow-layer swelled ground of near surface not only especially develop by crack, but also especially sensitive to climate change, is a kind of typical case
Non-homogeneous three-phase medium.Soil property psychrometer effect is obvious, when water suction, soil expansion, softening, and intensity decline；The soil body is received after dehydration
Contracting, generates crack therewith.This swell-shrink characteristics of swelled ground will sufficiently be shown when change of moisture content.Repeatedly swollen
Contracting results in the loose of the swelled ground soil body, and form many irregular cracks wherein, to be swelled ground surface into one
Step weathering creates condition.The presence in crack destroys the globality of the soil body, reduces the intensity of the soil body, while invading for rainwater
The evaporation of moisture opens convenience in entering and being native, and then, the variation of weather further causes the fluctuation of water content in soil
With repeated for breathing phenomenon, this further causes the extension in crack and develops to soil layer deep, makes the part soil body
Intensity is greatly lowered, and forms weathered layer.The depth capacity of this weathered layer substantially within the scope of the influence depth of weather, generally exists
1.5-2.0m, depth capacity is up to 4.0m.
In swelled ground grogs the most important feature of clay ingredient be containing a large amount of hydrophilic mineral, hydrophilic mineral
Main constituents are kaolinite, montmorillonite, illite.So its spy for being deformed with apparent water swelling dehydration shrinkage
Property.Swelled ground is often in compared with hardened condition under native state, but it has larger sensitivity to the variation of the factors such as weather and the hydrology
Property, and this sensibility usually can generate serious harm to engineering works.
Soil environment specific for swelled ground, mini pile exclusive use effect is poor, be easy to cause mini pile pile foundation disconnected
It splits, larger problem is impacted to mini pile, the protection resisted to it can be produced without a kind of mold in the prior art
Body.
[summary of the invention]
The object of the present invention is to provide for mini pile to resist swelled ground protection mould and production and preparation method thereof,
To solve the problems, such as that existing mold can not produce the protective for resisting swelled ground.
The invention adopts the following technical scheme: for mini pile to resist swelled ground protection mould, comprising:
One exterior sheathing is hollow and up big and down small bullet；
One steel reinforcement cage is bound by a plurality of reinforcing bar, is layed in exterior sheathing inner wall, and shape is consistent with exterior sheathing；
One inner template is hollow and up big and down small bullet, is located inside steel reinforcement cage；
One positioning ring is welded in the middle part of inner template, is formed by a plurality of reinforcement welding, in hollow and up-small and down-big taper
Body, mini pile is passed through and is positioned to mini pile when for constructing；
One formwork for cylindrical columns extends vertically through exterior sheathing, positioning ring, steel reinforcement cage and inner template setting；
Wherein, the axis of exterior sheathing, positioning ring, steel reinforcement cage and inner template overlaps, between steel reinforcement cage and inner template
Region forms protection shell for being poured concrete, and the region between inner template and formwork for cylindrical columns is formed for being poured padded coaming
Buffer body.
Further, it was welded with around inner template inner wall one week to a reinforcing rib, wherein being located at the reinforcing rib in the middle part of inner template
For welding positioning ring.
Further, buffer body is condensed by padded coaming, and padded coaming is water-absorbing sponge, polystyrene foam plastics
With one of polystyrene foam plastics or a variety of.
Further, exterior sheathing, positioning ring, steel reinforcement cage and inner template are cone, wherein the upper bottom surface of exterior sheathing is straight
Diameter is 1-1.5m, and bottom surface diameter is greater than mini pile stake diameter, a height of 2-4m.
Further, the distance between steel reinforcement cage and inner template are 20mm.
Production method for mini pile to resist swelled ground protection mould, comprises the steps of:
Reinforcing bar is laid with along inner wall in exterior sheathing inner cavity and binding forms the steel reinforcement cage of taper；
Inner template is placed in steel reinforcement cage together with positioning ring；
Formwork for cylindrical columns is run through and is inserted perpendicularly into positioning ring and inner template center；
Concrete is poured between steel reinforcement cage and inner template；
After concrete coagulation is at plate, inner template is taken out by lifting positioning ring, forms the protection with steel reinforcement cage shell
Shell；
Be poured padded coaming between protection shell and formwork for cylindrical columns, solidification complete to be formed integrally connected by protection shell
With the protective of buffer body composition；
After condensation of materials to be buffered, formwork for cylindrical columns and exterior sheathing are taken out to get the protective that can resist expansive soil foundation.
Further, inner template is made by following steps:
Profiled sheet is cut into sector；
The welding of fan-shaped profiled sheet tapered is obtained into inner template；
It is reinforced at the position of inner template upper, middle and lower, around inner template inner wall welded reinforcement, wherein being located at middle part is to add
Strengthening tendons；
Positioning ring is welded on the middle part reinforcing rib of inner template, positioning ring is formed by a plurality of reinforcement welding, in it is hollow and on
Small lower big bullet guarantees that the axis of positioning ring and inner template overlaps.
Further, exterior sheathing is made by following steps:
Profiled sheet is cut into sector；
Fan-shaped profiled sheet is welded tapered.
The application method that swelled ground protection mould is resisted for mini pile, comprises the steps of:
Mini pile is directly squeezed into soil by piling machine；
Excavate the tapered foundation pit of the mini pile pile foundation top soil body；
In mini pile pile foundation upper brushes binder；
By prefabricated protective through mini pile top is inserted in, so that protective is located in taper foundation pit；
Finally carry out soil body backfill appropriate.
The beneficial effects of the present invention are: by setting positioning ring, so that inner template is easier to pull out, and to the appearance of entire mold
State is adjusted, it is ensured that position of the formwork for cylindrical columns relative to exterior sheathing avoids formwork for cylindrical columns from being biased to two sides, influence inner template
The thickness of concrete when being poured concrete between exterior sheathing, and then influence the thickness of protective；The guarantor that the present invention produces
Watch box, size, posture and shape are uniform, are suitble to large-scale production, and the protective that cast-in-place mode produces, operation difficulty are big,
Size is inhomogenous, and the construction time is long, and human cost is high, is not suitable for large area and uses；The protective produced by mold, in stake
After the top setting of body is arranged protective, deformation buffer body is served as, so that pile body carries out " isolation " with the surface layer soil body, is overcome swollen
Tired brokenization caused by the tension and compression circulation of pile body unilateral side concrete caused by swollen native dilation repeatedly；It is bad to reduce swelled ground
Engineering characteristic leads to the lateral force that pile body is subject to, and reduces influence of the buoyancy of expansion soil expansion generation to pile body；Certain journey
The bearing capacity of pile foundation is increased on degree.
[Detailed description of the invention]
Fig. 1 is the sectional view after present invention installation；
Fig. 2 is the effect picture after present invention installation；
Fig. 3 is the top view after present invention installation.
Fig. 4 is structural schematic diagram of the invention；
Fig. 5 is top view of the invention.
Wherein: 1. miniature pile bodies；2. protecting shell；3. buffer body；4. positioning ring；5. inner template；6. exterior sheathing；7. circle
Post mold；8. reinforcing rib.
[specific embodiment]
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Since not only crack is especially developed for the shallow-layer swelled ground of near surface, and it is especially sensitive to climate change, it is a kind of
Typical non-homogeneous three-phase medium.Soil property psychrometer effect is obvious, when water suction, soil expansion, softening, and intensity decline；It is native after dehydration
Body is shunk, and generates crack therewith.Therefore it is not suitable as supporting course, can be considered around the soil layer, therefore in top stake
Body carries out " isolation " with the surface layer soil body, and partition method covers the rounded water for having certain wall thickness of upper section around the pile body of top
Mud pipe, tube body is tapered, then fills full padded coaming between pile body and pipe and form buffer body 3, and buffer body 3 is coagulated by padded coaming
It ties, padded coaming is one of water-absorbing sponge, polystyrene foam plastics and polystyrene foam plastics or a variety of.
Design cause of the invention is as follows, when topsoil is subjected to displacement by extraneous factor or by external force variation when, meeting
External section of jurisdiction is had a strong effect, power is transmitted on padded coaming along section of jurisdiction, and padded coaming sponges this portion by finite deformation
Component, to protect internal pile body unaffected.But the bearing capacity of stake at this time will be counted below the buried depth of section of jurisdiction,
Since pile body is imbedded in padded coaming in section of jurisdiction, padded coaming has certain deformability, when pile foundation receives vertically
When axle power, corresponding deformation occurs for padded coaming, so that the frictional force generated in the normal soil body cannot be provided for stake, that is to say, that
Its trend that pile foundation cannot be prevented to sink, therefore in the case where the bearing capacity for calculating stake is only to consider that pile body is directly contacted with the soil body
Portion.
The mini pile pile foundation of the bad engineering characteristic of expansive soil foundation, as shown in Figure 1, Figure 2 and Fig. 3 institute can be resisted for one kind
Show, comprising:
One mini pile 1, lower end are solid capitate column；
The protection shell 2 of one concrete is sheathed on the upper semisection of mini pile 1 in hollow and up big and down small bullet,
And；
One steel reinforcement cage is bound by a plurality of reinforcing bar, is located at protection 2 outer wall of shell, and shape and protection shell 2 are consistent,
In hollow and up big and down small bullet；
One buffer body 3 is filled between mini pile 1 and protection shell 2；
Wherein, buffer body 3 is used to absorb extruding of the topsoil to protection shell 2 by finite deformation, and protection shell 2 is located at
The outside of buffer body 3 is simultaneously contacted with the soil body, and buffer body 3 is located between mini pile 1 and protection shell 2 and for filling the two
Between gap, mini pile 1 be steel tube concrete pile, outside diameter 150-200mm.
Protecting shell 2 is in hollow and up big and down small taper, and the deformation displacement of the soil body is right by diving to the trend to taper off deeply
3 thickness of buffer body answered protects the specific depth of shell 2 to be determined by the depth that soil layer is disturbed by diving to the deep trend that also tapers off
It is fixed, generally in 1.5-2.0m, depth capacity 4m, therefore shell 2 is protected to can be set to cone, a height of 2-4m of cone,
Bottom surface radius is 1-1.5m, and the wall thickness of protection shell 2 is 50-100mm, the bullet of 1 lower end of mini pile be it is solid, conveniently squeeze into
The soil body reduces the difficulty of operation, and the length dimension of lower part pile body is determined that specific method is referring to common bearing capacity of pile foundation by bearing capacity
Calculation method is surveyed report according to " technical code for building pile foundation " JGJ94-2008 and corresponding entry destination and is determined.
There are three types of the construction methods of above-mentioned 1 pile foundation of mini pile, and the realization that can resist the mini pile 1 of swelled ground has prefabricated and shows
Pour two ways, specific detailed in Example.
Embodiment one
Embodiment one is the first cast-in-place mode, the specific steps are as follows:
Mini pile 1 is directly squeezed into soil by piling machine；
It is tapered to excavate the 1 pile foundation top soil body of mini pile；
The steel reinforcement cage bound is inserted in 1 middle and upper part of mini pile, so that steel reinforcement cage is located at tapered soil body surface；
Inner template 5 is inserted in 1 middle and upper part of mini pile, steel reinforcement cage ensures have at a distance from 20mm between inner template 5；
Concrete is poured between inner template 5 and the soil body；
Inner template 5 is taken out after 3-5 days, forms the protection shell 2 with steel reinforcement cage shell；
Binder is smeared on 1 pile lining of mini pile；
Padded coaming is poured between protection shell 2 and mini pile 1, solidification is completed to form the guarantor of integrally connected after 1-3 days
Protect shell 2 and buffer body 3, it should be noted that avoid mini pile 1 from directly contacting with protection shell 2, answer the generation of mini pile 1
Power makes mini pile 1 impaired；
Soil body backfill appropriate.
Wherein, inner template 5 is made by following steps, as shown in Figure 4 and Figure 5:
Profiled sheet is cut into sector；
Fan-shaped profiled sheet is welded tapered；
It is reinforced at the position of taper steel plate upper, middle and lower, around taper steel plate inner wall welded reinforcement；
Positioning ring 4 is welded being located in the middle above reinforced steel, wherein positioning ring 4 is formed by a plurality of reinforcement welding, fixed
Position ring 4 is bullet, and positioning ring 4 is not less than the outer diameter of mini pile 1 for being inserted in 1 middle and upper part of mini pile, the diameter of upper bottom surface,
Its bottom surface is welded on reinforced steel, and the diameter of bottom surface is equal to the diameter in the middle part of taper steel plate.
Wherein, steel reinforcement cage is bound by a plurality of reinforcing bar, the tapered body of steel reinforcement cage, and steel reinforcement cage is for being inserted in mini pile 1
Top, steel reinforcement cage is also used to form space with inner template 5, so that fill concrete between steel reinforcement cage and inner template 5, and form guarantor
Shell 2 is protected, the upper bottom surface of steel reinforcement cage is equal with the diameter of the tapered soil body, and bottom surface is more than or equal to the outer diameter of mini pile 1.
Embodiment two
Embodiment two is second of cast-in-place mode, the specific steps are as follows:
Mini pile 1 is directly squeezed into soil by piling machine；
It is tapered to excavate the 1 pile foundation top soil body of mini pile；
It is laid with reinforcing bar in tapered soil body surface, and binds the taper steel reinforcement cage to form the fitting soil body；
Inner template 5 is inserted in 1 middle and upper part of mini pile, steel reinforcement cage ensures have at a distance from 20mm between inner template 5；
Concrete is poured between inner template 5 and steel reinforcement cage；
Inner template 5 is taken out after 3-5 days, forms the protection shell 2 with steel reinforcement cage shell；
Binder is smeared on 1 pile lining of mini pile；
Padded coaming is poured between protection shell 2 and mini pile 1, after 1-3 days, solidification is completed to form the guarantor of integrally connected
Protect shell 2 and buffer body 3, it should be noted that avoid mini pile 1 from directly contacting with protection shell 2, answer the generation of mini pile 1
Power makes mini pile 1 impaired；
Soil body backfill appropriate.
Wherein, inner template 5 is made by following steps, as shown in Figure 4 and Figure 5:
Profiled sheet is cut into sector；
Fan-shaped profiled sheet is welded tapered；
It is reinforced at the position of taper steel plate upper, middle and lower, around taper steel plate inner wall welded reinforcement；
Positioning ring 4 is welded being located in the middle above reinforced steel, wherein positioning ring 4 is formed by a plurality of reinforcement welding, fixed
Position ring 4 is bullet, and positioning ring 4 is not less than the outer diameter of mini pile 1 for being inserted in 1 middle and upper part of mini pile, the diameter of upper bottom surface,
Its bottom surface is welded on reinforced steel, and the diameter of bottom surface is equal to the diameter in the middle part of taper steel plate.
After positioning ring 4 is set, it is ensured that position of the mini pile 1 relative to protection shell 2 guarantees the posture of mini pile 1,
Mini pile 1 is avoided to be biased to two sides, when influencing to be poured concrete between inner template 5 and the soil body, the thickness of concrete, and then influence to protect
The thickness for protecting shell 2, avoids pile foundation out of shape, by the way that positioning ring 4 is arranged, can also facilitate lifting inner template 5, make it easier to be detached from
Concrete.
Embodiment three
Embodiment three is prefabrication system, the specific steps are as follows:
Inner template 5 is prefabricated:
Profiled sheet is cut into sector,
Fan-shaped profiled sheet is welded tapered；
Steel reinforcing is utilized on the section of taper steel plate inner wall upper, middle and lower.
Protect shell 2 prefabricated:
It takes a back taper template to be laid with reinforcing bar along inner wall in its inner cavity and bind and forms the steel reinforcement cage of taper；
Inner template 5 is put on steel reinforcement cage；Steel reinforcement cage ensures have at a distance from 20mm between inner template 5；
It is poured concrete between steel reinforcement cage and inner template 5, forms the protection shell 2 with steel reinforcement cage shell.
Buffer body 3 is prefabricated:
Formwork for cylindrical columns 7 is inserted into protection shell 2；The diameter of diameter >=mini pile 1 of formwork for cylindrical columns 7, and formwork for cylindrical columns 7
Diameter be less than protection the smaller bottom surface of shell 2 diameter, avoid formwork for cylindrical columns 7 directly with protection shell 2 contact；
Padded coaming is poured between protection shell 2 and formwork for cylindrical columns 7；
After to be solidified, formwork for cylindrical columns 7 is taken out.
When construction, mini pile 1 is directly squeezed into soil by piling machine；
Excavate the 1 tapered foundation pit of the pile foundation top soil body of mini pile；
In 1 pile foundation upper brushes binder of mini pile；
Then the buffer body 3 of pre-formed integrally connected and protection shell 2 are inserted in 1 top of mini pile, are located at cone
In shape foundation pit；
Finally carry out soil body backfill appropriate.
It is that can especially do steam curing because factory's curing condition is more preferable by the way of prefabricated, intensity is higher, effect
Fruit is more preferable.
Although there are many above-mentioned 1 pile foundation advantage of mini pile, it is swollen for resisting that the prior art does not have mold that can produce
The protective of swollen soil, the protective produced by mold, after setting is arranged protective on the top of pile body, so that pile body and table
Layer soil body carries out " isolation ", overcomes the tension and compression circulation of swelled ground pile body unilateral side concrete caused by dilation repeatedly caused tired
Labor brokenization；Reducing the bad engineering characteristic of swelled ground leads to the lateral force that pile body is subject to, and reduces the buoyancy that expansion soil expansion generates
Influence to pile body；Increase the bearing capacity of pile foundation to a certain extent.
Therefore, the invention discloses mould is protected for mini pile to resist swelled ground, as shown in Figure 4, comprising:
One exterior sheathing 6 is hollow back taper body；
One steel reinforcement cage is bound by a plurality of reinforcing bar, is layed in 6 inner wall of exterior sheathing, and shape and exterior sheathing 6 are consistent；
One inner template 5 is hollow back taper body, is located inside steel reinforcement cage；
One positioning ring 4, is welded in the middle part of inner template 5, is formed by a plurality of reinforcement welding, tapered body, when for constructing
Mini pile 1 passes through, and positions to mini pile 1；
One formwork for cylindrical columns 7 extends vertically through exterior sheathing 6, positioning ring 4, steel reinforcement cage and inner template 5 and is arranged；
Wherein, the axis of exterior sheathing 6, positioning ring 4, steel reinforcement cage and inner template 5 overlaps, steel reinforcement cage and inner template 5 it
Between region form protection shell 2 for being poured concrete, region between inner template 5 and formwork for cylindrical columns 7 is for being poured buffering
Material forms buffer body 3.
It is welded with to reinforcing rib 8 within one week around 5 inner wall of inner template, wherein being located at the reinforcing rib 8 at 5 middle part of inner template for welding
Connect positioning ring 4.Exterior sheathing 6, positioning ring 4, steel reinforcement cage and inner template 5 are cone, wherein the upper bottom surface diameter of exterior sheathing 6
For 1-1.5m, bottom surface diameter is greater than 1 diameter of mini pile, a height of 2-4m.The distance between steel reinforcement cage and inner template 5 are
20mm。
By the way that positioning ring 4 is arranged, so that inner template 5 is easier to pull out, and the posture of entire mold is adjusted, Ke Yibao
Position of the formwork for cylindrical columns 7 relative to exterior sheathing 6 is demonstrate,proved, avoids formwork for cylindrical columns 7 from being biased to two sides, influences between inner template 5 and exterior sheathing 6
When being poured concrete, the thickness of concrete, and then the thickness of protective is influenced, and influence between inner template 5 and formwork for cylindrical columns 7
When being poured padded coaming, and then influence to be formed the thickness of buffer body 3.
Inner template 5 is made by following steps:
Step 1: cutting profiled sheet into sector；
Step 2: the welding of fan-shaped profiled sheet tapered is obtained into inner template 5；
Step 3: being reinforced at 5 upper, middle and lower position of inner template, around 5 inner wall welded reinforcement of inner template, wherein being located at
Middle part is reinforcing rib 8；
Step 4: positioning ring 4 is welded on the middle part reinforcing rib 8 of inner template 5, positioning ring 4 is formed by a plurality of reinforcement welding,
In hollow and up-small and down-big bullet, guarantee that the axis of positioning ring 4 and inner template 5 overlaps.
Exterior sheathing 6 is made by following steps:
Step 1: cutting profiled sheet into sector；
Step 2: fan-shaped profiled sheet being welded tapered.
Inner template 5 and exterior sheathing 6, since profiled sheet load is larger, prepared internal model are made using profiled sheet
Plate 5 and 6 economy of exterior sheathing are more preferable, without being handled and being processed in the xial feed power of internal template 5 and exterior sheathing 6, and
And profiled sheet inner wall has groove, just will increase connecing between concrete and padded coaming and corresponding exterior sheathing 6 and inner template 5
Contacting surface product, increases bond area, and then cohesive force is preferable, and when exterior sheathing 6 is profiled sheet, will increase itself and the soil body
Contact area increases skid resistance.
The invention also discloses the production methods for mini pile to resist swelled ground protection mould, by following steps group
At:
Step 1: being laid with reinforcing bar along inner wall in 6 inner cavity of exterior sheathing and binding forms the steel reinforcement cage of taper；
Step 2: inner template 5 is placed in steel reinforcement cage together with positioning ring 4；
Step 3: formwork for cylindrical columns 7 being run through and is inserted perpendicularly into 5 center of positioning ring 4 and inner template；
Step 4: being poured concrete between steel reinforcement cage and inner template 5；
Step 5: after concrete coagulation is at plate, inner template 5 being taken out by lifting positioning ring 4, being formed has outside steel reinforcement cage
The protection shell 2 of shell；
Step 6: be poured padded coaming between protection shell 2 and formwork for cylindrical columns 7, solidification complete to be formed integrally connected by
Protect the protective of 2 buffer body 3 of shell composition；
Step 7: after condensation of materials to be buffered, taking out formwork for cylindrical columns 7 and exterior sheathing 6 to get expansive soil foundation can be resisted
Protective.
It by the protective that Mold Making of the invention comes out is in back taper, the deformation displacement of the soil body is by diving to tapering off deeply
Trend, corresponding 3 thickness of buffer body protect the specific depth of shell 2 to be disturbed by soil layer by diving to the deep trend that also tapers off
Depth determines, generally in 1.5-2.0m, depth capacity 4m, therefore protecting shell 2 is cone, a height of 2-4m of cone, bottom
Radius surface is 1-1.5m, and the wall thickness of protection shell 2 is 50-100mm.
The protective that mold through the invention is produced, size, posture and shape are uniform, are suitble to large-scale raw
It produces, and the protective that cast-in-place mode produces, operation difficulty are big, size is inhomogenous, and the construction time is long, and human cost is high, is not suitable for
Large area uses.
The invention also discloses the application methods that swelled ground protection mould is resisted for mini pile, by following steps group
At:
Step 1: mini pile 1 is directly squeezed into soil by piling machine；
Step 2: excavating the 1 tapered foundation pit of the pile foundation top soil body of mini pile；
Step 3: in 1 pile foundation upper brushes binder of mini pile；
Step 4: by prefabricated protective through 1 top of mini pile is inserted in, so that protective is located in taper foundation pit；
Step 5: finally carrying out soil body backfill appropriate.
Claims (9)
1. for mini pile to resist swelled ground protection mould characterized by comprising
One exterior sheathing (6) is hollow and up big and down small bullet；
One steel reinforcement cage is bound by a plurality of reinforcing bar, is layed in the exterior sheathing (6) inner wall, shape and exterior sheathing (6) one
It causes；
One inner template (5) is hollow and up big and down small bullet, is located inside the steel reinforcement cage；
One positioning ring (4), is welded in the middle part of the inner template (5), is formed by a plurality of reinforcement welding, in hollow and up-small and down-big
Bullet, when for constructing mini pile (1) pass through and to mini pile (1) position；
One formwork for cylindrical columns (7) extends vertically through exterior sheathing (6), positioning ring (4), steel reinforcement cage and inner template (5) setting；
Wherein, the axis of the exterior sheathing (6), positioning ring (4), steel reinforcement cage and inner template (5) overlaps, the steel reinforcement cage with
Region between inner template (5) forms protection shell (2) for being poured concrete, the inner template (5) and formwork for cylindrical columns (7) it
Between region for be poured padded coaming formed buffer body (3).
2. according to claim 1 protect mould for mini pile to resist swelled ground, which is characterized in that around described interior
Template (5) are welded with to a reinforcing rib (8) for inner wall one week, wherein the reinforcing rib (8) being located in the middle part of inner template (5) is fixed for welding
Position ring (4).
3. according to claim 2 protect mould for mini pile to resist swelled ground, which is characterized in that the buffering
Body (3) is condensed by padded coaming, and the padded coaming is water-absorbing sponge, polystyrene foam plastics and polystyrene foam
One of plastics are a variety of.
4. according to claim 1 to 3 protect mould for mini pile to resist swelled ground, which is characterized in that institute
Stating exterior sheathing (6), positioning ring (4), steel reinforcement cage and inner template (5) is cone, wherein the upper bottom surface of the exterior sheathing (6)
Diameter is 1-1.5m, and bottom surface diameter is greater than mini pile (1) stake diameter, a height of 2-4m.
5. according to claim 4 protect mould for mini pile to resist swelled ground, which is characterized in that the reinforcing bar
The distance between cage and inner template (5) are 20mm.
6. -5 any production method for mini pile to resist swelled ground protection mould according to claim 1,
It is characterized in that, comprises the steps of:
Reinforcing bar is laid with along inner wall in the exterior sheathing (6) inner cavity and binding forms the steel reinforcement cage of taper；
The inner template (5) is placed in steel reinforcement cage together with positioning ring (4)；
The formwork for cylindrical columns (7) are run through and are inserted perpendicularly into positioning ring (4) and inner template (5) center；
Concrete is poured between the steel reinforcement cage and inner template (5)；
After concrete coagulation is at plate, inner template (5) are taken out by lifting the positioning ring (4), being formed has steel reinforcement cage shell
Protection shell (2)；
Be poured padded coaming between the protection shell (2) and formwork for cylindrical columns (7), solidification complete to be formed integrally connected by protecting
Protect the protective of shell (2) and buffer body (3) composition；
After condensation of materials to be buffered, the formwork for cylindrical columns (7) and exterior sheathing (6) are taken out to get the guarantor that can resist expansive soil foundation
Watch box.
7. the production method according to claim 6 for mini pile to resist swelled ground protection mould, feature exist
In the inner template (5) is made by following steps:
Profiled sheet is cut into sector；
The welding of fan-shaped profiled sheet tapered is obtained into inner template (5)；
Inner wall welded reinforcement is reinforced at the inner template (5) upper, middle and lower position, around inner template (5), wherein in being located at
Portion is reinforcing rib (8)；
Positioning ring (4) are welded on the middle part reinforcing rib (8) of the inner template (5), the positioning ring (4) is by a plurality of reinforcement welding
It forms, in hollow and up-small and down-big bullet, guarantees that the positioning ring (4) and the axis of inner template (5) overlap.
8. the production method according to claim 7 for mini pile to resist swelled ground protection mould, feature exist
In the exterior sheathing (6) is made by following steps:
Profiled sheet is cut into sector；
Fan-shaped profiled sheet is welded tapered.
9. -5 any application method that swelled ground protection mould is resisted for mini pile according to claim 1,
It is characterized in that, comprises the steps of:
The mini pile (1) is directly squeezed into soil by piling machine；
Excavate the tapered foundation pit of the mini pile (1) pile foundation top soil body；
In the mini pile (1) pile foundation upper brushes binder；
By prefabricated protective through the mini pile (1) top is inserted in, so that protective is located in taper foundation pit；
Finally carry out soil body backfill appropriate.
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| CN201910447190.4A CN110029666B (en) | 2019-05-27 | 2019-05-27 | Mold for micro pile to resist expansive soil protector and manufacturing and using method thereof |
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Cited By (1)
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| CN110029666B (en) | 2024-05-14 |
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