CN1233902C - Concrete pile, and spiral drilling machine and method for forming said pile - Google Patents
Concrete pile, and spiral drilling machine and method for forming said pile Download PDFInfo
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- CN1233902C CN1233902C CN 02103619 CN02103619A CN1233902C CN 1233902 C CN1233902 C CN 1233902C CN 02103619 CN02103619 CN 02103619 CN 02103619 A CN02103619 A CN 02103619A CN 1233902 C CN1233902 C CN 1233902C
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Abstract
The present invention relates to a concrete pile which is composed of an upper part, a lower part and a middle part which is in an inverse cone platform shape and is connected with the upper part and the lower part, wherein the diameter of the upper part is larger than the diameter of the lower part; the middle part is in inverse cone platform shape, and the included angle between the extension line of the inclined plane of the middle part and the central axis of the concrete pile 10 is 5 to 90 DEG. The present invention also relates to a screw driller and a method for forming the concrete pile.
Description
Technical field
The present invention relates to a kind of concrete pile, especially a kind of concrete pile that has inversed taper platform.
Background technology
Along with the high speed development of building trade, construction work is more and more higher to the design and construction requirement of ground, so concrete pile obtains application more and more widely in engineerings such as highrise building, bridge, harbour and coastal waters building.In order to make pile foundation can satisfy architectural design requirements such as resistance to deformation, antidetonation, the normal modes such as lengthening pile body, increasing pile body diameter that adopt improve bearing capacity.But, lengthening or increasing pile body diameter will inevitably cause increasing concrete consumption, particularly when pile body length and diameter ratio are excessive, the supporting capacity of pile body can significantly descend, therefore, by lengthening or strengthen pile body to improve the supporting capacity of pile body futile often, certainly will also can cause concrete a large amount of waste simultaneously.The applicant finds by practical study, the suffered vertical and horizontal load of pile body is stressed bigger at the shallow-layer of below ground, therefore only need increasing just can improve the supporting capacity of concrete pile greatly, and can save concrete amount at the pile body diameter at the shallow-layer place of below ground.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of concrete pile.Adopt the present invention, not only can guarantee and improve the pile body supporting capacity, keep the design shape of pile body effectively, can also save concrete consumption greatly simultaneously, under various geological conditionss, can be fast, construct in high quality, and reduce construction costs.
To achieve these goals, the invention provides a kind of concrete pile, it comprises: the upper and lower, described upper diameter D is greater than the diameter d of bottom, wherein: described concrete pile also comprises: the middle part that connects described upper and lower, the middle part is the little down big inversed taper platform of, the maximum gauge of this inversed taper platform equals upper part diameter D, the minimum diameter of this inversed taper platform equals the diameter d of bottom, upper part diameter D is 1.2～8: 1 with the ratio of the diameter d of described bottom, the middle part is the one or more inversed taper platforms that axially are provided with along concrete pile, and the angle of the central axis of inclined-plane, middle part extended line and concrete pile is 5 °～90 °.
In addition, as to further improvement of the present invention, wherein: described angle is 45 °.
In addition, as to further improvement of the present invention, wherein: at the outermost layer of described concrete pile be formed with cement paste reaming retaining wall layer on every side between the soil layer.
In addition, as to further improvement of the present invention, wherein: in described concrete pile, be inserted with reinforcing cage.
By concrete pile of the present invention, not only can guarantee and improve the pile body supporting capacity, the design shape that keeps pile body effectively, simultaneously can also save concrete consumption greatly, for example under equal conditions, with the concrete material of equivalent amount, the supporting capacity that can improve pile body reaches more than 80%.Adopt the spiral drilling machine and the method that are used for the moulding concrete pile among the present invention, can be under various geological conditionss, fast, construct in high quality, produce concrete pile, and reduce construction costs with given shape.
Description of drawings
Can more be expressly understood characteristics of the present invention and advantage from the following drawings, wherein:
Fig. 1 (a)-1 (d) has described the concrete pile of different structure of the present invention respectively;
Fig. 2 is the overall schematic of spiral drilling machine of the present invention, can see in the figure, and spiral drilling machine of the present invention is circumscribed with concrete pump, concrete mixer and slush pump, cement mixer;
Fig. 3 is the detail elevation of spiral drilling machine of the present invention;
Fig. 4 (a) is the detailed view of drilling tool in the spiral drilling machine of the present invention; Fig. 4 (b) is provided with the partial enlarged view of structure on screw blade for expression cement paste nozzle;
Fig. 5 (a)-5 (f) is used for the schematic diagram of the procedure of moulding concrete pile of the present invention for expression.
The specific embodiment
Fig. 1 (a)-(d) has described the concrete pile of different structure of the present invention respectively.From these accompanying drawings, can be clear that, the common feature of concrete pile 10 of the present invention is: it is by top 10A, bottom 10C and the middle part 10B one formation that has connected top 10A and bottom 10C, top 10A diameter is greater than the diameter of bottom 10C, and the ratio of D: d is 1.2～8: 1.The middle part 10B that connects top 10A and bottom 10C is a little down big inversed taper platform, and the maximum gauge of this inversed taper platform equals the diameter D of top 10A, and the minimum diameter of this inversed taper platform equals the diameter d of bottom 10C.
The degree of depth L of top 10A is usually greater than 0.1 meter.Shown in Fig. 1 (b), described middle part 10B is an inversed taper platform shape, and the angle of the central axis I of its inclined-plane extended line and concrete pile 10 is 5 °～90 °, is generally 45 °.At the outermost layer of concrete pile 10 be formed with cement paste on every side between the soil layer and protect reaming parietal layer 12.According to actual needs, also can make certain improvement, shown in Fig. 1 (d), can in concrete pile 10, insert reinforcing cage 14 structure of concrete pile 10 of the present invention, or shown in Fig. 1 (c), can thicken bottom 10C and the cement paste reaming retaining wall layer 12 between the soil layer on every side.When inserting reinforcing cage 14, according to the requirement of horizontal force resistant, usually, the degree of depth L of top 10A＞2.5D.
Discussed the structure of concrete pile 10 of the present invention above, below, with reference to Fig. 2-4 (b) spiral drilling machine of the present invention 20 that is used to form described concrete pile 10 and the drilling tool 28 that is used for this rig are elaborated.
Described spiral drilling machine 20 comprises chassis 22, is arranged on the boring tower 24 on the chassis 22 and is installed in drilling tool 28 on the boring tower 24 by the jacking system on the boring tower 26.Drilling tool 28 is provided with the hollow drill 28b of band screw blade 28 a.Shown in Fig. 3 and 4a, the shape of drilling tool 28 is similar to above-mentioned concrete pile 10, also by having large diameter top, the connection middle part of inversed taper platform shape and the bottom one that has than minor diameter constitute, the middle part is a little down big inversed taper platform, the maximum gauge of this inversed taper platform approximates upper part diameter D, and the minimum diameter of this inversed taper platform approximates the diameter d of bottom.Its concrete structure, design parameters are consistent with the structure and parameter of above-mentioned concrete pile, so here be not described in further detail.The top of hollow drill 28b is interconnected rotatably through the end of unit head 30 with concrete feeding pipe 32, and the other end of concrete feeding pipe 32 links to each other with concrete pump 41 to realize supplying with concrete in hollow drill 28b.Motor 31 can drive unit head 30 by not shown reducing gear and rotate, and rotates to carry out bore operation thereby drive hollow drill 28b.In hollow drill 28b, be axially arranged with an interior Grouting Pipe 34 along it.Interior Grouting Pipe 34 upper ends are provided with slurry casting machine 36, slurry casting machine 36 through outside flow inlet 38 with the cement paste supply source, be that mixer 40a, cement mixer 40c link to each other with slush pump 40b.The lower end of interior Grouting Pipe 34 is connected with cement paste nozzle 42.Shown in Fig. 4 (b), described cement paste nozzle 42 is arranged under the non-stress face of foot screw blade 28a, and the non-stress face edge that should not exceed screw blade 28a stops up preventing.Like this, when boring, by the cement paste of cement paste nozzle 42 soil horizon ejection towards periphery, to form cement paste dado layer 12 on the soil horizon around by interior Grouting Pipe 34 supplies.In the present embodiment, the axial approximate vertical of the direction of nozzle 42 and hollow drill 28b, but those of ordinary skills should understand, according to actual conditions, for example, when hardpan is constructed, the spray angle of nozzle 42 can be changed into horizontal by 10 °～45 ° angles according to soil behaviour.Nozzle 42 is generally two and be symmetrical in hollow drill 28b axis and distribute, and also can adopt three or more certainly.Be welded with drill bit 44 in the lower end of hollow drill 28b, between outlet of the lower end of hollow drill 28b and drill bit 44, be provided with the valve plate 46 of the lower end outlet of closed hollow drilling rod 28b, the lower end of valve plate 46 can be hinged on the drill bit 44 and by the control device (not shown) as spring that is fixed on drill bit and the valve plate and control the unlatching of valve plate 46 with respect to hollow drill 28b lower end, to realize concrete discharge.Certainly, also can adopt other device or structure to control the unlatching of valve plate with respect to hollow drill 28b, can number be the utility model patent of ZL96212544.X referring to the applicant's notice of authorization for example.
Below, the method that is used to form concrete pile among the present invention is elaborated.
Fig. 5 (a)-5 (f) has schematically shown the process that is used for moulding concrete pile of the present invention, and wherein, Fig. 5 (a) has represented the drilling tool step of churning cement paste simultaneously of holing downwards, and the direction of arrow among the figure is represented the drilling direction of drilling tool; State when Fig. 5 (b) has represented that drilling tool gets into projected depth, the direction of arrow among the figure is represented the drilling direction of drilling tool.Fig. 5 (c) has represented to promote the drilling tool step of guncreting simultaneously after drilling tool reaches projected depth, and the direction of arrow among the figure is represented the direction of improvement of drilling tool; Fig. 5 (d) has represented to tamp concrete step in the hole that gets out; Fig. 5 (e) has represented to insert the step of reinforcing cage, and the direction of arrow among the figure is represented the direction of insertion of reinforcing cage; Fig. 5 (f) has represented reinforcing cage is inserted into the step at the end.
Shown in Fig. 5 (a)-5 (f), after method of the present invention is achieved in that major diameter top that the drilling depth when drilling tool drill bit bottom reaches the preformed concrete pile has degree of depth L, start slush pump, go out cement paste with the pressure churning of 0.1-40Mpa through slip casting supply source, outside flow inlet, slurry casting machine, interior Grouting Pipe and cement paste nozzle; After drilling tool drill bit bottom reaches the preformed degree of depth L of concrete pile, promote drilling tool and stop the churning cement paste, simultaneously, open described valve plate, through the hollow drill guncreting, concrete is removed drilling tool after tamping the moulding height that the hole that gets out reaches concrete pile.Afterwards, according to actual needs, can insert reinforcing cage, thereby form concrete pile.
Adopt this method, because in the process of boring, go out cement paste by churning, can be at the outermost layer of concrete pile and form cement paste reaming retaining wall layer on every side between the soil layer, therefore can prevent that concrete and moisture wherein from can not infiltrate in the soil on every side, thereby can keep the design shape of concrete pile effectively, and reduce concrete amount, particularly described inversed taper platform middle part, avoid producing collapse the hole danger; The cement paste that churning simultaneously goes out is extruded in creeping into and rises along hole wall, to play the effect of sliding agent.
Above content only is a most preferred embodiment of the present invention.Obviously, under the prerequisite that does not break away from inventive concept, those of ordinary skills can make various modification and improvement to the present invention.For example, can connect adjacent diameter top and minor diameter bottom with a plurality of inversed taper platforms coupling part successively in concrete pile, the angle of the central axis (I) of the inclined-plane extended line of these inversed taper platform shape coupling parts and concrete pile can be 5 °～90 °.The theory of current ground stabilization, adopt stake soil to bear load jointly in design, can give full play to the bearing capacity of natural ground like this, inversed taper platform shape bearing capacity of pile foundation, bring into play jointly by pile body and frustum, bigger angle of flare is arranged, make the pile body spacing be increased to 4-8d after, can reduce a number 1/3-1/2, a same bearing capacity effect that rises before arrival subtracts stake, the maximum characteristics of this kind stake can make the ground balance, and transverse horizontal power is subjected to bigger constraint, the sedimentation value step-down, composite foundation presents flexibility.So strengthening the shallow-layer cross sections partly of pile foundation long-pending is that to improve pile foundation vertical, the effective method of horizontal bearing capacity.
The applicant finds by practical study, can adopt a soil to bear the load theory jointly equally in the clump of piles design, can solve the no sediment of stake end, loosened soil and hole wall relaxes and sedimentation value diminishes with the guncreting pile driving construction, improves the standard, vertical bearing capacity.What should emphasize is that under the prerequisite that does not break away from inventive concept, all these improvement all should fall within the scope of protection of the present invention.
Claims (4)
1. concrete pile, it comprises: top (10A) and bottom (10C), described top (10A) diameter D is greater than the diameter d of bottom (10C), it is characterized in that: described concrete pile also comprises: the middle part (10B) that connects described top (10A) and bottom (10C), middle part (10B) is the little down big inversed taper platform of, the maximum gauge of this inversed taper platform equals the diameter D on top (10A), the minimum diameter of this inversed taper platform equals the diameter d of bottom (10C), the ratio of the diameter d of the diameter D on top (10A) and described bottom (10C) is 1.2～8: 1, middle part (10B) is the one or more inversed taper platforms that axially are provided with along concrete pile, and the angle of the central axis (I) of middle part (10B) inclined-plane extended line and concrete pile is 5 °～90 °.
2. concrete pile according to claim 1 is characterized in that: described angle is 45 °.
3. concrete pile according to claim 2 is characterized in that: at the outermost layer of described concrete pile be formed with cement paste reaming retaining wall layer (12) on every side between the soil layer.
4. concrete pile according to claim 3 is characterized in that: be inserted with reinforcing cage in described concrete pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02103619 CN1233902C (en) | 2002-01-29 | 2002-01-29 | Concrete pile, and spiral drilling machine and method for forming said pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02103619 CN1233902C (en) | 2002-01-29 | 2002-01-29 | Concrete pile, and spiral drilling machine and method for forming said pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1435541A CN1435541A (en) | 2003-08-13 |
| CN1233902C true CN1233902C (en) | 2005-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02103619 Expired - Fee Related CN1233902C (en) | 2002-01-29 | 2002-01-29 | Concrete pile, and spiral drilling machine and method for forming said pile |
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| Country | Link |
|---|---|
| CN (1) | CN1233902C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526745B (en) * | 2013-10-14 | 2016-06-15 | 何霞 | Lithosphere makes method and the deposited reinforced concrete pile of deposited reinforced concrete pile |
| CN106978974B (en) * | 2017-05-12 | 2024-04-09 | 李广信 | CFG reducing back taper stepped pile, preparation method and drilling tool |
| CN109750663A (en) * | 2019-01-11 | 2019-05-14 | 河北中地志诚土木工程有限公司 | A kind of long centrum stake and its detail design method |
| CN115198734A (en) * | 2022-07-19 | 2022-10-18 | 广东广晟南方建设有限公司 | Large-size CFG pile structure in municipal soft soil zone and energy-saving construction method thereof |
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2002
- 2002-01-29 CN CN 02103619 patent/CN1233902C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1435541A (en) | 2003-08-13 |
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