CN204080791U - A kind of precast hollow uplift pile - Google Patents
A kind of precast hollow uplift pile Download PDFInfo
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- CN204080791U CN204080791U CN201420594052.1U CN201420594052U CN204080791U CN 204080791 U CN204080791 U CN 204080791U CN 201420594052 U CN201420594052 U CN 201420594052U CN 204080791 U CN204080791 U CN 204080791U
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- pile body
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Abstract
The utility model discloses a kind of precast hollow uplift pile, belong to civil works technical field.The utility model comprises the hollow pile body in the top cooperatively interacted and lower hollow pile body, axially through upper stake holes is provided with in the middle part of the hollow pile body in top, the cross-sectional diameter of upper stake holes reduces from the bottom up gradually, wadding weft variation and hollow uplift pile form " wedge shape " effect, enhance the uplift resistance between wadding weft variation and stake, the pile body of the hollow pile body in top is reserved with the prestressing force pore that several axis is through, lower axial reinforcement is furnished with in lower hollow pile body, lower axial reinforcement top is through prestressing force pore and the bearing plate anchoring being fixed on hollow pile body top, top, for uplift pile provides resistance to plucking prestressing force.The utility model has effectively can strengthen wadding weft variation and pile body anchoring property, reduce the length of wadding weft variation, improve the pouring quality of wadding weft variation, saves the advantage of reinforcing bar and concrete consumption.
Description
Technical field
The utility model relates to the technical field of civil engineering, and particularly relating to the hollow uplift pile relating to industry and civilian construction, specifically, is a kind of precast hollow uplift pile.
Background technology
Uplift pile is widely used in the rock anchorage base etc. in big basement anti-floating, towering building resistance to plucking, tidal quay platform resistance to plucking, suspension bridge and the rock anchorage base of cable stayed bridge, the pile foundation of Large Ship Dock base plate and dead load test pile.Pre-stress hollow uplift pile is as the one of uplift pile, and have diameter small specific surface long-pending large, good in economic efficiency advantage, is used widely in engineering.Stake with between foundation structure by hollow top implanted reinforced bar cage in stake and at top hollow interior filling fill out concrete and be connected.According to Jiangsu Province's engineering construction standard " pre-stressed concrete hollow square pile foundation tecnical regulations " 4.5.5 article, when hollow pile is used as uplift pile, pile structural strength, pile extension bonding strength, end plate aperture shear strength, rod and heading tensile strength thereof should be carried out, stake top (employing wadding weft variation) calculates with cushion cap junction intensity equivalent-load power.Therefore the adhesion stress between wadding weft variation and hollow pile inwall is one of Ultimate Bearing Capacity of Tension Piles principal element.
Fill out core slightly expanded concrete (being not less than C40) when determining uplift bearing capacity, be calculated as follows:
N 1?≤?
K 1 πd 1 f n l
In formula,
n 1-hollow square pile single pile uplift force design load;
k 1--empirical coefficient, gets 0.8;
d 1-wadding weft variation diameter (hollow square pile internal diameter);
l-wadding weft variation length;
f nadhesion strength design load between-wadding weft variation and hollow square pile inwall, should be determined by field trial, and when lacking experience, getting C40 slightly expanded concrete is 0.2-0.4MPa.
Because Prefabricated hollow pile is made by centrifuging process, inwall smoother, namely
f nsmaller, the adhesion strength between wadding weft variation and hollow pile inwall is low, institute think design reach comparatively large pulling resistance time, need longer wadding weft variation length.Longer wadding weft variation, needs more reinforcing bar and concrete material on the one hand, uneconomical, fills out core on the other hand longer, and filling is filled out concrete difficult quality and is guaranteed.
Therefore, under the prerequisite meeting supporting capacity, reduce wadding weft variation length has important engineer applied to be worth.
In prior art, the stake holes of precast hollow uplift pile is the cylinder that diameter of section is consistent from top to bottom, after wadding weft variation inserts stake holes, the anchoring property of wadding weft variation and precast hollow uplift pile pile body depends on the adhesion strength between wadding weft variation and hollow pile inwall, compared with prior art, the stake holes of the hollow pile body in top of the present utility model is up-small and down-big round table-like, hollow diameter of section diminishes from the bottom up gradually, fill with after filling out concrete in stake holes, " wedge shape " effect is formed between wadding weft variation and pile body, the tensile bearing capacity of stirrup in the hollow pile body of Compressive Bearing Capacity and top that the anchoring property of wadding weft variation and pile body depends on wadding weft variation, and these two bearing capacities are much larger than bonding frictional force, therefore the length of wadding weft variation can significantly reduce, both concrete and amount of reinforcement had been decreased, the pouring quality of wadding weft variation can be ensured again, improve operating efficiency.
Lower axial reinforcement length is greater than lower hollow pile body, until be anchored on bearing plate through prestressing force pore, its beneficial effect by axial reinforcement under stretch-draw anchor, the hollow pile body in top and lower hollow pile body is held together, and obtain resistance to plucking prestressing force.In order to the bonding strength both increasing further, upper axial reinforcement stretches into downwards in lower hollow pile body and fixes with lower hollow pile body, and built-in length is not less than " Code for design of concrete structures " GB50010-2010 is about the requirement of anchorage length of steel bar.
Surface, hollow pile body bottom section, top is roughened state, and its beneficial effect is the globality strengthening lower hollow pile body newly placed concrete and the hollow pile body in top.
Because the stirrup of the hollow pile body in top will provide tensile bearing capacity in resistance to plucking process, therefore the stirrup reinforcement ratio of the hollow pile body in top is higher than lower hollow pile body, and hoop tension when concrete spacing is extracted according to wadding weft variation suffered by hollow pile body calculates to be determined.
The utility model has effectively can strengthen wadding weft variation and pile body anchoring property, reduce the length of wadding weft variation, improve the pouring quality of wadding weft variation, saves the advantage of reinforcing bar and concrete consumption.
Utility model content
Technical problem to be solved in the utility model is for the above-mentioned state of the art, and provide a kind of and effectively can strengthen wadding weft variation and pile body anchoring property, reduce the length of wadding weft variation, improve the pouring quality of wadding weft variation, save the precast hollow uplift pile of reinforcing bar and concrete consumption.
The utility model solves the problems of the technologies described above adopted technical scheme:
A kind of precast hollow uplift pile, wherein: comprise the hollow pile body in the top cooperatively interacted and lower hollow pile body, axially through upper stake holes is provided with in the middle part of the hollow pile body in top, the cross-sectional diameter of upper stake holes reduces from the bottom up gradually, the pile body of the hollow pile body in top is reserved with the prestressing force pore that several axis is through, be furnished with lower axial reinforcement in lower hollow pile body, lower axial reinforcement top is through prestressing force pore and the bearing plate anchoring being fixed on hollow pile body top, top.
For optimizing technique scheme, the concrete measure taked also comprises:
Be furnished with upper axial reinforcement and upper hoop stirrup in the hollow pile body in above-mentioned top, upper axial reinforcement passes pile body downwards and stretches in lower hollow pile body.
Be provided with axially through lower stake holes in the middle part of above-mentioned lower hollow pile body, lower stake holes shape is right circular cylinder, its cross-sectional diameter and upper stake holes cross-sectional diameter bottom suitable.
Lower hoop stirrup is furnished with in above-mentioned lower hollow pile body; The stirrup spacing of upper hoop stirrup is less than the stirrup spacing of lower hoop stirrup.
The external diameter of the hollow pile body in above-mentioned top is equal with the external diameter of lower hollow pile body.
Above-mentioned bearing plate is provided with for axial reinforcement under anchoring and with the anchor hole of prestressing force pore to it, the quantity of anchor hole and the quantity of prestressing force pore suitable.
Above-mentioned bearing plate is provided with several retaining thread hole, bearing plate is fixedly connected with by the hollow pile body in retaining thread hole and top.
The stake of the hollow pile body in above-mentioned top is long is 0.5 meter to 1.5 meters.
The bottom of the hollow pile body in above-mentioned top is matsurface.
A preparation method for precast hollow uplift pile, comprises the following steps:
In step one, colligation, axial reinforcement and upper hoop stirrup form reinforcing cage, upper reinforcing cage is enclosed within cross-sectional diameter from the bottom up on diminishing internal mold, and reserve prestressing force pore at the axial bellows of upper reinforcing cage surrounding colligation, concreting is carried out to upper reinforcing cage, make the hollow pile body in top, maintenance is to specifying the length of time;
Under step 2, colligation, axial reinforcement and lower hoop stirrup form descending reinforcing cage, lower axial reinforcement upper end is passed the prestressing force pore of the good hollow pile body in top of maintenance, by bearing plate, hollow for top pile body is fixed, axial reinforcement under stretch-draw, to centrifugal forming lower hollow pile body after descending reinforcing cage feeding concrete;
After step 3, the concrete curing to the length of time of lower hollow pile body, to the grouting of prestressing force pore, lower axial reinforcement upper end is anchored on bearing plate, makes the hollow pile body in top and lower hollow pile body be combined into precast hollow uplift pile.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural perspective of the hollow pile body in top;
Fig. 3 is the structural representation of stake holes on Fig. 2;
Fig. 4 is the structural representation of lower hollow pile body;
Fig. 5 is the structural representation of bearing plate.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 is to Figure 5 shows that structural representation of the present utility model.
Reference numeral is wherein: the hollow pile body in top 1, upper stake holes 11, prestressing force pore 12, upper axial reinforcement 13, lower hollow pile body 2, lower stake holes 21, lower axial reinforcement 22, bearing plate 3, anchor hole 31, retaining thread hole 32.
First embodiment: as shown in Figures 1 to 5,
A kind of precast hollow uplift pile, wherein: comprise the hollow pile body 1 in the top cooperatively interacted and lower hollow pile body 2, axially through upper stake holes 11 is provided with in the middle part of the hollow pile body in top 1, the cross-sectional diameter of upper stake holes 11 reduces from the bottom up gradually, the pile body of the hollow pile body in top 1 is reserved with the prestressing force pore 12 that four axis are through, four lower axial reinforcements 22 are furnished with in lower hollow pile body 2, bearing plate 3 is fixed on the hollow pile body 1 in top by retaining thread hole 32, anchor hole 31 aims at prestressing force pore 12, prestressed stretch-draw is carried out through after prestressing force pore 12 in lower axial reinforcement 22 top, be anchored on bearing plate 3 after building, whole precast hollow uplift pile is made to obtain resistance to plucking prestressing force.
In embodiment, be furnished with upper axial reinforcement 13 and upper hoop stirrup in the hollow pile body in top 1, upper axial reinforcement 13 passes pile body downwards and stretches in lower hollow pile body 2, and the hollow pile body 1 in top is fixed as one further with lower hollow pile body 2.
In embodiment, axially through lower stake holes 21 is provided with in the middle part of lower hollow pile body 2, lower stake holes 21 shape is right circular cylinder, its cross-sectional diameter and upper stake holes 11 cross-sectional diameter bottom suitable, stake holes 11 and lower stake holes 21 can be made to be connected as a single entity smoothly, to facilitate the Stress transmit of wadding weft variation.
In embodiment, in lower hollow pile body 2, is furnished with lower hoop stirrup; The stirrup spacing of upper hoop stirrup is less than the stirrup spacing of lower hoop stirrup.
In embodiment, the external diameter of the hollow pile body in top 1 is equal with the external diameter of lower hollow pile body 2.When the hollow pile body 1 in top and lower hollow pile body 2 are fixed as one, can form the preformed pile that an outer rim is complete, convenient piling, makes the specious of stake simultaneously.
In embodiment, the stake of the hollow pile body in top 1 long is 0.5 meter.
In embodiment, the bottom of the hollow pile body 1 in top is matsurface, for increasing the adhesion strength of the hollow pile body 1 in top and lower hollow pile body 2, and the globality of both increases.
The preparation method of precast hollow uplift pile, comprises the following steps:
In step one, colligation, axial reinforcement 13 and upper hoop stirrup form reinforcing cage, upper reinforcing cage is enclosed within cross-sectional diameter from the bottom up on diminishing internal mold, and reserve prestressing force pore 12 at the axial bellows of upper reinforcing cage surrounding colligation, concreting is carried out to upper reinforcing cage, the mode of building can adopt centrifugal or inside to add mode that mould vertically vibrates makes the hollow pile body 1 in top, maintenance is to specifying the length of time;
Under step 2, colligation, axial reinforcement 22 and lower hoop stirrup form descending reinforcing cage, lower axial reinforcement 22 upper end is passed the prestressing force pore 12 of the good hollow pile body 1 in top of maintenance, on top, bearing plate 3 is fixed on hollow pile body 1 top, the anchor hole 31 of bearing plate 3 aims at prestressing force pore 12, by bearing plate 3, hollow for top pile body 1 is fixed, axial reinforcement 22 under stretch-draw, to centrifugal forming lower hollow pile body 2 after descending reinforcing cage feeding concrete;
After step 3, lower hollow pile body 2 concrete curing to the length of time, prestressing force pore 12 is in the milk, lower axial reinforcement 22 upper end is anchored on bearing plate 3, make the hollow pile body 1 in top and lower hollow pile body 2 be combined into precast hollow uplift pile.
Second embodiment:
In embodiment, the stake of the hollow pile body in top 1 long is 1.5 meters.
Do not state part with the first embodiment.
Below be only preferred embodiment of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, not departing from the some improvements and modifications under the utility model principle prerequisite, protection domain of the present utility model should be considered as.
Claims (9)
1. a precast hollow uplift pile, it is characterized in that: comprise the hollow pile body in the top cooperatively interacted (1) and lower hollow pile body (2), middle part, the hollow pile body in described top (1) is provided with axially through upper stake holes (11), the cross-sectional diameter of described upper stake holes (11) reduces from the bottom up gradually, the pile body on the hollow pile body in described top (1) is reserved with the prestressing force pore (12) that several axis is through, lower axial reinforcement (22) is furnished with in described lower hollow pile body (2), described lower axial reinforcement (22) top is through prestressing force pore (12) and bearing plate (3) anchoring being fixed on hollow pile body (1) top, top.
2. a kind of precast hollow uplift pile according to claim 1, it is characterized in that: be furnished with upper axial reinforcement (13) and upper hoop stirrup in the hollow pile body in described top (1), described upper axial reinforcement (13) passes pile body downwards and stretches in lower hollow pile body (2).
3. a kind of precast hollow uplift pile according to claim 2, it is characterized in that: described lower hollow pile body (2) middle part is provided with axially through lower stake holes (21), described lower stake holes (21) shape is right circular cylinder, its cross-sectional diameter and upper stake holes (11) cross-sectional diameter bottom suitable.
4. a kind of precast hollow uplift pile according to claim 3, is characterized in that: be furnished with lower hoop stirrup in described lower hollow pile body (2); The stirrup spacing of described upper hoop stirrup is less than the stirrup spacing of lower hoop stirrup.
5. a kind of precast hollow uplift pile according to claim 4, is characterized in that: the external diameter on the hollow pile body in described top (1) is equal with the external diameter of lower hollow pile body (2).
6. a kind of precast hollow uplift pile according to claim 5, it is characterized in that: described bearing plate (3) is provided with for axial reinforcement under anchoring (22) and with the anchor hole (31) of prestressing force pore (12) to it, the quantity of described anchor hole (31) and the quantity of prestressing force pore (12) suitable.
7. a kind of precast hollow uplift pile according to claim 6, it is characterized in that: described bearing plate (3) is provided with several retaining thread hole (32), described bearing plate (3) is fixedly connected with the hollow pile body in top (1) by retaining thread hole (32).
8. a kind of precast hollow uplift pile according to claim 6, is characterized in that: the stake on the hollow pile body in described top (1) long is 0.5 meter to 1.5 meters.
9. a kind of precast hollow uplift pile according to claim 6, is characterized in that: the bottom on the hollow pile body in described top (1) is matsurface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594052.1U CN204080791U (en) | 2014-10-15 | 2014-10-15 | A kind of precast hollow uplift pile |
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| CN201420594052.1U CN204080791U (en) | 2014-10-15 | 2014-10-15 | A kind of precast hollow uplift pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264659A (en) * | 2014-10-15 | 2015-01-07 | 金陵科技学院 | Prefabricated hollow uplift pile and preparation method thereof |
| CN108677934A (en) * | 2018-06-15 | 2018-10-19 | 金陵科技学院 | The construction method of uplift pile and uplift pile |
-
2014
- 2014-10-15 CN CN201420594052.1U patent/CN204080791U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264659A (en) * | 2014-10-15 | 2015-01-07 | 金陵科技学院 | Prefabricated hollow uplift pile and preparation method thereof |
| CN104264659B (en) * | 2014-10-15 | 2016-04-13 | 金陵科技学院 | A kind of precast hollow uplift pile and preparation method thereof |
| CN108677934A (en) * | 2018-06-15 | 2018-10-19 | 金陵科技学院 | The construction method of uplift pile and uplift pile |
| CN108677934B (en) * | 2018-06-15 | 2024-01-19 | 金陵科技学院 | Anti-pulling pile anti-cancer agent pile pulling construction method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20171015 |
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| CF01 | Termination of patent right due to non-payment of annual fee |