CN110067245A - It is a kind of can expanding reinforcing spiral self-drilling type piling bar and its method of construction - Google Patents
It is a kind of can expanding reinforcing spiral self-drilling type piling bar and its method of construction Download PDFInfo
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- CN110067245A CN110067245A CN201910222129.XA CN201910222129A CN110067245A CN 110067245 A CN110067245 A CN 110067245A CN 201910222129 A CN201910222129 A CN 201910222129A CN 110067245 A CN110067245 A CN 110067245A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/56—Screw piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention patent relates to field of foundation treatment, more particularly to it is a kind of can expanding reinforcing spiral self-drilling type piling bar and its method of construction, can expanding reinforcing spiral self-drilling type piling bar, screw pile including having helical blade on central axis, above-mentioned spiral self-drilling type piling bar further includes the extension bar being made of at least one section of extension, the upper end of above-mentioned screw pile and the lower end of extension bar connect, and are wherein provided with expanding guiding dish at least one section of extension in extension bar；Wherein, above-mentioned expanding guiding dish is funnel-shaped, opening upwards, and bottom and extension bar bar wall are tightly connected.It is starched by stake lateral irrigation, slurries arrive at expanding guiding dish, form reinforcing body, improve the ultimate vertical bearing capacity of stake, critical load and lateral bearing capacity, it is more more economical and applicable to improve bearing capacity than increasing blade number, blade diameter and increasing the long method of stake, so that ground is more firm.
Description
Technical field
The invention patent relates to field of foundation treatment, and in particular to it is a kind of can expanding reinforcing spiral self-drilling type piling bar and build
Make method.
Background technique
Spiral self-drilling type piling bar is adaptable wide, and quick construction is efficient, and environment influence is small, and overall economics are good, well
Durability and shock resistance, in the case where country vigorously advocates the call of environmental protection, spiral self-drilling type piling bar has broad based growth prospect.
After spiral self-drilling type piling bar is to foundation stabilization, when by vertical load, since central steel shaft lateral area is smaller, total side is provided
Frictional resistance specific gravity is also smaller, when stake is long shorter, does not consider that axial bearing capacity is contributed in the resistance of spiral self-drilling type piling bar side usually.It is perpendicular
Helical blade is relied primarily on to load to undertake, and can assert that the stake is end-bearing pile substantially.Increase its axial bearing capacity if necessary,
Only realized by increasing helical blade diameter, increasing blade number and increasing the modes such as stake is long.However helical blade diameter
Increasing is limited in scope, and blade diameter is excessive to be easily caused blade bending deformation in load bearing process and increase diameter and mention to bearing capacity
It is high not significant.To the torque apparatus of piling bar construction it is also proposed that relatively high requirement, has in space sometimes after increase blade or stake are long
In the case of limit, the construction equipment possible operation is difficult, influences construction speed.In addition, thicker working as the reinforcing of spiral self-drilling type piling bar
After soft foundation, spiral self-drilling type piling bar slenderness ratio is excessive, is also easy to produce lateral deflection unstability.Therefore, it is badly in need of proposing a kind of economically feasible
And installation method quickly and efficiently improves the axial bearing capacity and stability of spiral self-drilling type piling bar.
Summary of the invention
The object of the present invention is to provide one kind can bring higher axially and transversely bearing capacity, increases expanding can adding for stability
Solid spiral self-drilling type piling bar and method of construction, with expectation solve the above problems.
To achieve the goals above, the application on the one hand the technical solution adopted is that it is a kind of can expanding reinforcing spiral from boring
Formula piling bar, the screw pile including having helical blade on central axis, above-mentioned spiral self-drilling type piling bar further include being added by least one section
The lower end of the extension bar of meropodium composition, the upper end of above-mentioned screw pile and extension bar connects, wherein in extension bar at least one section plus
Expanding guiding dish is provided on meropodium；Wherein, above-mentioned expanding guiding dish is funnel-shaped, opening upwards, bottom and extension bar bar wall
It is tightly connected.
When spiral self-drilling type piling bar precession soil layer, by the way that above-mentioned expanding guiding dish is arranged, grouting operation and piling are operated
It is synchronous to carry out, that is, because of the setting of expanding guiding dish when driving piles, makes expanding guiding dish rotation compression soil layer downwards, in soil layer and lengthen
The cavity for being located at extension bar outer circle is formed between bar, grouting rear slurry flows downward along extension bar into the cavity, until slurries
Expanding guiding dish is arrived at, the slurries of solidification is made to form more firm composite consolidation body with spiral self-drilling type piling bar is made after maintenance,
Starched by stake lateral irrigation, improve the ultimate vertical bearing capacity of stake, critical load and lateral bearing capacity, than increase blade number,
Blade diameter and the increase long method of stake are more economically and applicable to improve bearing capacity, so that ground is more firm.
Further, the diameter of above-mentioned expanding guiding dish: extension diameter=(1.4~2.2): 1.
When the diameter of expanding guiding dish is arranged, it is found by the applicant that diameter cannot be too big, if bigger than normal, expanding guiding dish rotation
The cavity diameter left after into the soil body is larger, and such cavity is also easy to produce collapse hole phenomenon, forms continuous effective to subsequent pouring and adds
Solid is unfavorable, or even can not form effective reinforcing body.Certainly, if too small, cavity diameter is less than normal, the reinforcing of the reinforcing body of formation
Effect can be extremely limited, and consolidation effect is undesirable.So by it is expanding guiding dish diameter: extension diameter=(1.4~
2.2): 1, expanding guiding dish can make the periphery soil body be not easy collapse hole by the cavity that soil layer leaves, and guarantee the continuous of reinforcing body
Property, so that the reinforcing body formed after grouting is possessed higher firm effect.
Maximum gauge≤helical blade maximum gauge of above-mentioned expanding guiding dish prevents expanding lead to facilitate piling to operate
To the downward precession of the excessive interference spiral self-drilling type piling bar of dish.
Further, in extension close to one end of screw pile, above-mentioned expanding guiding dish be located at (1/4) of extension~
(1/3) at, the reinforcing body consolidation effect that expanding guiding dish setting is formed on the position is more excellent.
Further, above-mentioned expanding guiding dish includes the top of tapered lower part and tubular, the upper end and top of lower part
Lower end be tightly connected；Angle between above-mentioned lower inside wall and the bar wall of extension bar is 25~45 °.
Further, spiral self-drilling type piling bar further includes sleeve, for being sleeved on the junction of screw pile and extension bar；
Alternatively, above-mentioned sleeve, for being sleeved on junction between extension, to improve the intensity of junction, bolt company is can be used in connection
It connects.
Further, the central axis of above-mentioned screw pile or extension is circular shaft, diameter >=80mm of the central axis；Or
The central axis of person, above-mentioned screw pile or extension is square shaft, side length >=80mm of the center shaft cross section.
Further, at least two expanding guiding dish are provided on above-mentioned extension bar, for weaker, the side wall for soil layer
The case where being easy collapse hole.
Further, at least two helical blades, the distance between adjoining spiral blade: spiral on above-mentioned screw pile
Blade maximum gauge=(3~2): 1.
Further, the screw pile is sliceable multi-segment structure, facilitate the dismounting and lengthening of screw pile.
As further aspect of the application, present invention also provides can expanding reinforcing spiral self-drilling type piling bar construction side
Method, including following operation:
Firstly, installation screw pile is to specified elevation and connects the extension bar with expanding guiding dish；Excavate stake top nearby
Face forms the heatable adobe sleeping platform for being greater than expanding guiding dish, and casing is arranged in heatable adobe sleeping platform side wall wall；Cement grout needed for configuring is sufficiently stirred
It is even, continue mixing time >=3min；
Then, construction equipment repositions installation with the expanding extension bar for being oriented to dish, wherein when expanding guiding dish starts
When into soil layer, cement grout after the completion of stirring is uninterruptedly poured into casing, expanding guiding dish is for most deep to cement grout
Arriving at location is positioned；
Finally, construction equipment stops working when spiral self-drilling type piling bar is drilled into specified elevation, it is simultaneously stopped toward casing
Interior addition cement grout seals pile crown using the cement grout in casing.
This method simple possible, in filling process, filling process progress synchronous with piling process and using no pressure grouting,
Construction time cost will not additionally be increased and without construction machinery；After grouting is completed, the slurry in casing can be directly made into
The platform for sealing pile crown saves construction time cost without in addition processing pile crown.
Further, excavate heatable adobe sleeping platform when, bottom layer overlay waterproof material, for prevent cement grout from ground downwards
Infiltration.
Spiral self-drilling type piling bar after grouting compared with for the spiral self-drilling type piling bar that is not in the milk, it is taking the utility model has the advantages that
1. increasing piling bar side-friction force, the end-bearing pile that rubs is become from original end-bearing pile；
2. it is more obvious to increase its lateral deflection stabilizing effect for the stake in soft soil foundation；
3. the slurry protection of stake lateral irrigation, which can improve, reduces piling bar corrosion rate in the higher soil layer of corrosion class, anti-corrosion property is improved,
Extend the service life of spiral self-drilling type piling bar；
4. sedimentation is smaller, and works more sensitive for settling ratio is particularly important under identical load action；
5. bending stiffness increases, there is higher lateral bearing capacity；
The present invention is described further with reference to the accompanying drawings and detailed description.The additional aspect of the present invention and excellent
Point will be set forth in part in the description, and partially will become apparent from the description below.Or practice through the invention
It solves.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to assist the understanding of the present invention, content provided in attached drawing and its
Related explanation can be used for explaining the present invention in the present invention, but not constitute an undue limitation on the present invention.In the accompanying drawings:
Fig. 1 is for illustrating the spiral self-drilling type piling bar of the embodiment one in embodiment and the schematic diagram of reinforcing body；
Fig. 2 is the top cross sectional view for illustrating the expanding guiding dish in embodiment；
Fig. 3 is the spiral self-drilling type piling bar schematic diagram for illustrating the embodiment one in embodiment；
Fig. 4 is for illustrating the spiral self-drilling type piling bar of the embodiment two in embodiment and the schematic diagram of reinforcing body；
In the figure, it is marked as 100- screw pile, 101- helical blade, 200- extension bar, 201- extension, the expanding guiding of 220-
The top of the expanding guiding dish of dish, 221-, the lower part of the expanding guiding dish of 222-, 300- sleeve, 400- casing, 500- consolidation by grouting
Body.
Specific embodiment
Clear, complete explanation is carried out to the present invention with reference to the accompanying drawing.Those of ordinary skill in the art are being based on these
The present invention will be realized in the case where explanation.Before in conjunction with attached drawing, the present invention will be described, of particular note is that:
The technical solution provided in each section including following the description and technical characteristic in the present invention are not rushing
In the case where prominent, these technical solutions and technical characteristic be can be combined with each other.
In addition, the embodiment of the present invention being related in following the description is generally only the embodiment of a branch of the invention, and
The embodiment being not all of.Therefore, based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness
Every other embodiment obtained, should fall within the scope of the present invention under the premise of labour.
About term in the present invention and unit.Term in description and claims of this specification and related part
" comprising " and its any deformation, it is intended that cover and non-exclusive include.
Picture 1-4, embodiment one: it is a kind of can expanding reinforcing spiral self-drilling type piling bar, including spiral is had on central axis
The screw pile 100 of blade 101, above-mentioned spiral self-drilling type piling bar further include the extension bar 200 being made of one section of extension 201, on
The upper end for stating screw pile 100 is connect with the lower end of extension bar 200, is wherein set at least one section of extension 201 in extension bar 200
It is equipped with expanding guiding dish 220；Wherein, above-mentioned expanding guiding dish 220 is funnel-shaped, opening upwards, bottom and 200 bar wall of extension bar
It is tightly connected.The diameter of above-mentioned expanding guiding dish 220: 201 diameter of extension=(1.4~2.2): 1.Here expanding guiding dish
220 diameter can comprehensively consider pile peripheral earth intensity, permeability, groundwater condition and be configured.
It is expanding to be oriented to the sky left after the 220 precession soil body of dish if bigger than normal when the diameter of expanding guiding dish 220 is arranged
Chamber is relatively large in diameter, and such cavity is also easy to produce collapse hole phenomenon, and the reinforcing body 500 for forming continuous effective to subsequent pouring is unfavorable, even
Effective reinforcing body 500 can not be formed.
Certainly, if too small, cavity diameter is less than normal, and the reinforcement effect of the reinforcing body 500 of formation can be extremely limited, after reinforcing
Effect is undesirable.So by it is expanding guiding dish 220 diameter: 201 diameter of extension=(1.4~2.2): 1, expanding guiding dish
220 can make the periphery soil body be not easy collapse hole by the cavity that soil layer leaves, and guarantee the continuity of reinforcing body 500, also make to be in the milk
The reinforcing body 500 formed afterwards possesses higher firm effect.
When 100 helical blade of screw pile, 101 quantity is not less than 2, the spacing of helical blade 101 should be adjoining spiral
2-3 times of 101 average value of blade, to give full play to each bearing capacity with spiral.Root diameter is 60~270mm, center
Steel shaft, which can select rectangular perhaps round seamless steel pipe while can according to need, selects solid square shaft or circular shaft；Preferably,
When using square shaft, preferably solid shafting.When the central axis of above-mentioned screw pile 100 or extension 201 is circular shaft, the central axis
Diameter >=80mm；Alternatively, when the central axis of above-mentioned screw pile 100 or extension 201 is square shaft, the side of the center shaft cross section
Length >=80mm.Round steel pipe is preferably used when central axis uses circular shaft, when using square shaft, preferably solid shafting, spiral shell
When the central axis for revolving stake 100 is square shaft, screw pile 100 has longer service life, can more penetrate and compare since surface area is small
The axial rigidity of closely knit soil layer, square shaft is bigger, deforms smaller.
101 diameter range of helical blade is 150mm~400mm.Helical blade 101 with a thickness of 6~12mm；Screw pitch is 50
~100mm.101 diameter of helical blade is at least 200mm or more.
Wherein the diameter of expanding guiding dish 220 should be configured according to the maximum gauge of following helical blade 101, be no more than
Maximum blade diameter, to facilitate piling to operate, preventing expanding guiding dish 220, excessively interference spiral self-drilling type piling bar is stretched downwards
Enter.Expanding guiding dish 220 is attached using welding and the central axis of extension 201.
Above-mentioned expanding guiding dish 220 includes the top 221 of tapered lower part 222 and tubular, the upper end and top of lower part 222
221 lower end is tightly connected；Angle between above-mentioned 222 inner sidewall of lower part and the bar wall of extension bar 200 is 25~45 °, preferably
Use 30 °.Splicing the connection bolt between screw pile 100 and extension bar 200, between extension 201 is not less than M8.8 grades
High-strength bolt, diameter are 22mm~36mm, and bolt length should be 120mm~210mm, and the spiro rod length of bolt is according to steel shaft size
Concrete configuration.
In extension 201 close to one end of screw pile 100, above-mentioned expanding guiding dish 220 is located at (1/4) of extension 201
At~(1/3), it is more excellent that expanding guiding dish 220 is arranged to 500 consolidation effect of reinforcing body formed on the position.
Spiral self-drilling type piling bar further includes sleeve 300, for being sleeved on the interconnecting piece and extension bar 200 of screw pile 100
Junction；To improve the intensity of junction, connection can be connected by screw bolts.
A kind of spiral self-drilling type piling bar reinforcement means, including following operation:
Firstly, construction equipment is in place determining a site, orientation and angle are adjusted, installs first with several spiral shells
The screw pile 100 of vane piece 101 has expanding guiding by the connection of bolt hole 5 using high-strength bolt when being installed to specified elevation
The extension bar 200 of dish 220, while stake top ground nearby is excavated, the heatable adobe sleeping platform for being greater than expanding guiding dish 220 is formed, if ground
The infiltration coefficient of soil layer is larger, and bottom layer overlay waterproof material prevents slurries from permeating downwards, and a shield is arranged in heatable adobe sleeping platform side wall wall
Cylinder 400, while needing to configure cement grout according to correlative factors such as geological condition, weathers, notice that slurries should stir,
Duration >=3min is sufficiently stirred；
Wherein, cement grout needed for configuring selects the ratio of mud of slurries that should be determined according to saturation degree, the permeability of soil, right
It is preferably 0.45~0.65 in the saturated soil ratio of mud, is preferably that 0.7~0.9 (loose gravelly soil, gravel are suitable for the unsaturated soil ratio of mud
It is 0.5~0.6)；Low water-cement ratio slurries preferably mix water-reducing agent；
Then, construction equipment repositions installation with the expanding extension bar 200 for being oriented to dish 220, wherein when expanding guiding
When dish 220 initially enters soil layer, cement grout after the completion of stirring is uninterruptedly poured into casing 400, expanding guiding dish 220 is used for
The most deep arriving at location of cement grout is positioned；
Finally, construction equipment stops working when spiral self-drilling type piling bar is drilled into specified elevation, it is simultaneously stopped toward casing
Cement grout is added in 400, and pile crown is sealed using the cement grout in casing 400.
In filling process, filling process is synchronous with piling process to be carried out and is in the milk using no pressure, will not additionally be increased and be applied
Work time cost and without construction machinery and after grouting completes, slurry in casing 400 can directly be made into sealing pile crown
Platform saves construction time cost without in addition processing pile crown.The ultimate vertical bearing capacity for improving stake is starched by stake lateral irrigation, than
Increase blade number and leaf blade size method increase bearing capacity is more economically and applicable；Consolidation by grouting body 500 is used as on the outside of piling bar
Protective layer, reduce the corrosion rate of steel shaft, extend the service life of piling bar；Increase the cross sectional moment of inertia of piling bar, especially steel
When shaft design length is too long, the critical load that lateral deflection unstability occurs for piling bar can be increased.
Embodiment two: what is different from the first embodiment is that above-mentioned extension bar 200 includes two section extensions 201, every section of extension
An expanding guiding dish 220 is respectively set on 201, is used to be directed to the case where soil layer is weaker, and side wall is easy collapse hole, according to specific feelings
When condition is in the milk, continuous when the expanding guiding dish 220 of one section of extension 201 is entered soil layer to carry out grouting operation, which adds
After meropodium 201 protrudes into soil layer, another section of extension 201 goes successively to soil layer, while it is uninterrupted to be in the milk, and keeps reinforcing body 500 in place
Coupling part is uninterrupted between the expanding guiding dish 220 and the expanding guiding dish 220 that is located above of lower section, keeps continuous.
Junction is set with sleeve 300 between extension 201, and sleeve 300 is connect with two sections of extensions 201.
Related content of the invention is illustrated above.Those of ordinary skill in the art are in the feelings illustrated based on these
The present invention will be realized under condition.Based on above content of the invention, those of ordinary skill in the art are not making creativeness
Every other embodiment obtained, should fall within the scope of the present invention under the premise of labour.
Claims (10)
1. one kind can expanding reinforcing spiral self-drilling type piling bar, including on central axis have helical blade screw pile, feature
Be, the spiral self-drilling type piling bar further includes the extension bar being made of at least one section of extension, the upper end of the screw pile with
The lower end of extension bar connects, and is wherein provided with expanding guiding dish at least one section of extension in extension bar；Wherein, described expanding
It is funnel-shaped to be oriented to dish, opening upwards, bottom and extension bar bar wall are tightly connected.
2. spiral self-drilling type piling bar as described in claim 1, which is characterized in that the diameter of the expanding guiding dish=(1.4~
2.2) times root diameter；Maximum gauge≤helical blade maximum gauge of the expanding guiding dish.
3. spiral self-drilling type piling bar as described in claim 1, which is characterized in that in extension close to one end of screw pile, institute
Expanding guiding dish is stated to be located at (1/4)~(1/3) of extension.
4. spiral self-drilling type piling bar as described in claim 1, which is characterized in that the expanding guiding dish includes tapered lower part
With the top of tubular, the upper end of lower part and the lower end on top are tightly connected；Between the lower inside wall and the bar wall of extension bar
Angle be 25~45 °.
5. spiral self-drilling type piling bar as described in claim 1, which is characterized in that further include sleeve, for being sleeved on screw pile
With the junction of extension bar；Alternatively, the sleeve is for being sleeved on junction between extension.
6. spiral self-drilling type piling bar as described in claim 1, which is characterized in that the central axis of the screw pile or extension is
Circular shaft, diameter >=80mm of the central axis；Alternatively, the central axis of the screw pile or extension is square shaft, the central axis is transversal
Side length >=the 80mm in face.
7. spiral self-drilling type piling bar as described in claim 1, which is characterized in that be provided at least two expansions on the extension bar
Diameter is oriented to dish.
8. spiral self-drilling type piling bar as described in claim 1, which is characterized in that the screw pile is sliceable multistage knot
Structure.
9. can expanding reinforcing spiral self-drilling type piling bar method of construction, which is characterized in that including following operation:
Firstly, installation screw pile is to specified elevation and connects the extension bar with expanding guiding dish；Excavate stake top ground shape nearby
It is greater than the heatable adobe sleeping platform of expanding guiding dish at one, casing is arranged in heatable adobe sleeping platform side wall wall；Cement grout needed for configuring, stirs,
Continue mixing time >=3min；
Then, construction equipment repositions installation with the expanding extension bar for being oriented to dish, wherein when expanding guiding dish initially enters
When soil layer, cement grout after the completion of stirring is uninterruptedly directly poured into casing, expanding guiding dish is used for most deep to cement grout
Arriving at location is positioned；
Finally, when it is a kind of can the spiral self-drilling type piling bar of expanding reinforcing be drilled into specified elevation when, construction equipment stops working, together
When stop adding cement grout in the casing, pile crown is sealed using the cement grout in casing.
10. method of construction as claimed in claim 9, which is characterized in that when excavating heatable adobe sleeping platform, bottom layer overlay waterproof material,
For preventing cement grout from permeating downwards from ground.
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| CN201910222129.XA CN110067245A (en) | 2019-03-22 | 2019-03-22 | It is a kind of can expanding reinforcing spiral self-drilling type piling bar and its method of construction |
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| CN201910222129.XA CN110067245A (en) | 2019-03-22 | 2019-03-22 | It is a kind of can expanding reinforcing spiral self-drilling type piling bar and its method of construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113073640A (en) * | 2021-04-25 | 2021-07-06 | 浙江工业职业技术学院 | Multi-section expanding piling construction method |
| CN113073641A (en) * | 2021-04-25 | 2021-07-06 | 浙江工业职业技术学院 | Multi-section expanding and punching equipment |
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| CN113073641B (en) * | 2021-04-25 | 2022-08-26 | 浙江工业职业技术学院 | Multi-section expanding and punching equipment |
| CN113073640B (en) * | 2021-04-25 | 2022-08-26 | 浙江工业职业技术学院 | Multi-section expanding piling construction method |
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