CN102322060A - Composite prestressing retaining pile - Google Patents
Composite prestressing retaining pile Download PDFInfo
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- CN102322060A CN102322060A CN201110178190A CN201110178190A CN102322060A CN 102322060 A CN102322060 A CN 102322060A CN 201110178190 A CN201110178190 A CN 201110178190A CN 201110178190 A CN201110178190 A CN 201110178190A CN 102322060 A CN102322060 A CN 102322060A
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Abstract
The invention relates to a composite prestressing retaining pile. The composite prestressing retaining pile comprises a plain-concrete pile body, a steel bar cage and frameworks, wherein the frameworks comprise one or two groups of frameworks; each group of the frameworks comprises more than three prestressing steel strands; the prestressing steel strands of the frameworks are positioned in the same circumferential tensioning area as that of the longitudinal bars of the steel bar cage; the top of each of the prestressing steel strands is connected with an anchoring device; the bottom of the steel bar cage is connected with an annular plate; through holes are evenly arranged on the annular plate; and the lower end of each of the prestressing steel strands is positioned in one through hole of the annular plate. The composite prestressing retaining pile provided by the invention has the following advantages that: the stressing longitudinal bars and the prestressing steel strands are intensively arranged in the tensioning area, thus the utilization ratio of steel materials is effectively increased; the concrete of the tensioning area can be pre-stressed, so that the tensile capacity of concrete can be remarkably enhanced, and the flexural capacity and the anti-deformability of the retaining pile are improved; and the tensioning capacity of the steel materials can be exerted to a greater extent, thus the probability for the brittle fracture of the pile body is lowered, and the safety of retaining structures is improved.
Description
Technical field
The invention belongs to the geotechnical engineering technical field, relate to cantilevered campshed supporting and protection structure and the composite prestressed soil blocking pile that props up in the anchor formula campshed supporting and protection structure.
Background technology
The domestic colonnade formula soil blocking pile that is used for bracing of foundation pit is mainly mechanical hole building or manually digging hole deposited reinforced concrete pile at present; Be shaped as circle; Diameter is 350～2000mm; The pile body arrangement of reinforcement is to adopt more than the diameter 16mm stressed vertical muscle to form circular reinforcing cage with distributing bar, its diameter less than stake directly, 40～50mm is left as topping in the outside.Several kinds of forms below sectional reinforcement exists: cantilevered, because of the one-sided soil pressure of bearing, draw the district only meeting native side existence, the vertical muscle of major part is concentrated in the scope of tensile region, and other parts are merely constructional reinforcement.Prop up the anchor formula, because applied the elastic support in an anchor pole or the formation hole, all can there be the tensile region in the soil blocking pile both sides, so employing uniform reinforcement mode.An anchor formula of optimizing will be indulged the muscle centralized configuration in the tensile region, not arrangement of reinforcement or only constructional reinforcement near the natural axis.Above-mentioned several kinds of stake form of reinforcement all are evenly to arrange steel bar stress within the specific limits along the circumference of stake, and the tensile property of reinforcing bar is fine, but concrete tensile property is relatively poor.So prior art, tensile failure had taken place in concrete when existence caused the tension bearing capacity of reinforcing bar not give full play to greatly because of tensile property difference, and the tension bearing capacity of reinforcing bar can't be given full play to, shortcomings such as pile body non-deformability difference.
Summary of the invention
For the steel utilization ratio that improves soil blocking pile, the bending resistance that improves soil blocking pile, reinforcement pile body non-deformability, the present invention has designed a kind of composite prestressed soil blocking pile that meets the supporting and protection structure loading characteristic more.
The Technological improvement plan of realizing above-mentioned purpose is following:
The composite prestressed soil blocking pile comprises plain concrete pile body, reinforcing cage and skeleton, and skeleton is coaxial with the plain concrete pile body, and the plain concrete pile body is wrapped in reinforcing cage and skeleton; Said plain concrete pile body diameter is the 300-1200 millimeter; Said reinforcing cage comprises the vertical muscle that is distributed on the circumference, the ring stiffener of encircling vertical muscle and spiral shearing resistance stirrup; Said skeleton comprises one group of skeleton or two groups of skeletons, and every group of skeleton is made up of the prestress wire more than three; The vertical muscle of the prestress wire of said skeleton and reinforcing cage is positioned at the tensile region of same circumference; The top of said every prestress wire is connecting ground tackle; The bottom of said reinforcing cage is connecting ring flat-plate, is laid with through hole on the ring flat-plate, and the lower end of said every prestress wire is positioned at the through hole of ring flat-plate.
Said one group of skeleton is positioned at a side tensile region of reinforcing cage, and said two groups of skeleton symmetries are positioned at the tensile region, both sides of reinforcing cage.
Be arranged with sleeve pipe on the said prestress wire, said sleeve pipe is a bellows.
Useful technique effect of the present invention embodies in the following areas:
1, the present invention is configured in the tensile region with stressed vertical muscle and prestress wire concentrated area, with respect to traditional steel concrete soil blocking pile, reinforcement manner meet more unidirectional bent receive force mode, effectively improved steel utilization ratio;
2, the present invention is owing to increased prestress wire in steel concrete; The total length prestressing without bondn power steel strand that after building pile concrete, the tensile region are provided with apply prestressing force; Make the concrete of tensile region bear pressure in advance, can significantly improve concrete tension bearing capacity, improve the anti-bending bearing capacity and the non-deformability of soil blocking pile; Tensile failure just takes place earlier in concrete when avoiding the tension bearing capacity of reinforcing bar also not give full play to; The bearing capacity that drawn of steel is brought into play greatly, reduced the probability of pile body brittle destruction af-ter, the safety that has improved soil-baffling structure.
Description of drawings
Fig. 1 is applied to cantilevered supporting and protection structure sketch map for the present invention.
Fig. 2 is applied to campshed pile-anchor retaining structural representation for the present invention.
Fig. 3 is applied to support in the campshed supporting and protection structure sketch map for the present invention.
Fig. 4 is the A-A sectional view of Fig. 1.
Fig. 5 is the B-B sectional view of Fig. 2.
Fig. 6 is the partial enlarged drawing of Fig. 4.
Fig. 7 is the C-C sectional view of Fig. 1.
Fig. 8 is the D-D sectional view of Fig. 1.
Fig. 9 is the E-E sectional view of Fig. 2.
Figure 10 is the F-F sectional view of Fig. 2.
Figure 11 is the partial enlarged drawing of steel strand and ground tackle 8 junctions.
Among the above-mentioned figure: steel strand 1, sleeve pipe 2, stressed vertical muscle 3, ring stiffener 4, spiral shearing resistance stirrup 5, plain concrete pile body 6, ring flat-plate 7, ground tackle 8, hat beam 9, waist rail 10, prestressed anchor 11, interior support 12, sloping end face 13, sloping bottom surface 14.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is done to describe further through embodiment.
When foundation ditch is more shallow, can be used in cantilevered campshed supporting and protection structure, referring to Fig. 1, formed a line by a determining deviation by many composite prestressed soil blocking piles and to form colonnade formula piling structure, stake is connected through being preced with beam 9 with stake, formation cantilevered campshed supporting and protection structure.
The composite prestressed soil blocking pile comprises plain concrete pile body 6, reinforcing cage and skeleton, and skeleton is coaxial with plain concrete pile body 6, and plain concrete pile body 6 is wrapped in reinforcing cage and skeleton.The diameter of plain concrete pile body 6 is the 400-1200 millimeter.Reinforcing cage comprises the stressed vertical muscle 3 that is distributed on the circumference, the ring stiffener 4 of encircling stressed vertical muscle and spiral shearing resistance stirrup 5.Skeleton comprises one group of skeleton, and every group of skeleton is made up of five prestress wires 1, is set with sleeve pipe 2 on the prestress wire 1, and sleeve pipe 2 is bellows or pvc pipe.Five prestress wires 1 of one group of skeleton and the stressed vertical muscle 3 of reinforcing cage are positioned at a side tensile region of same circumference, see Fig. 4.The top of every prestress wire 1 is connecting ground tackle 8, sees Fig. 7 and Figure 11.The bottom of reinforcing cage is connecting ring flat-plate 7, is uniformly distributed with on the ring flat-plate 7 and offers through hole, and the lower end of every prestress wire 1 is positioned at the through hole of ring flat-plate 7, sees Fig. 8.
Concrete constructing operation is following: before the excavation of foundation pit, elder generation carries out the location and the drilling construction of composite prestressed soil blocking pile from sloping end face 13 natural ground, 0.8 meter of this example stake bore dia, and 1.8 meters of pile spacings, stake is long 13 meters, gets into following 7.5 meters of the sloping bottom surface of design.The reinforcing cage of being made up of prestress wire 1, sleeve pipe 2, stressed vertical muscle 3, ring stiffener 4, spiral shearing resistance stirrup 5, ring flat-plate 7, ground tackle 8 is inserted in the pore-forming back that finishes in the stake hole; Stressed vertical muscle 3 is that the tensile region is provided with 4 Φ 20 and the native face of the back of the body is provided with 6 Φ 20 meeting native face; The tensile region is provided with 5 prestress wires; See Fig. 4, the prestress wire model is ф 15.2 (7X ф 5).Behind the placement of cage of reinforcing bar, perfusion C30 concrete in the stake hole, pile finishes.After soil blocking pile maintenance a period of time, from the stake top prestress wire is applied prestressing force by root, single prestress value is 20 tons; At stake top application worker steel concrete hat beam 9; 0.5 meter of hat deck-molding, wide 0.9 meter, reinforcing bar and prestress wire all anchor in the hat beam; Through Guan Liang a pile is linked to be integral body, cooperative bearing.The concrete strength of treating composite prestressed soil blocking pile and Guan Liang reach design load 75% after, progressively with soil excavation to sloping bottom surface 14.
Stressed vertical muscle 3; Adopt HRB335 or HRB400 level hot-rolled screw thread reinforcing bar, bar diameter 14mm～32mm.
Spiral shearing resistance stirrup 5; Adopt HPB235 level hot rolling dish round bar, along the elongated screw arrangement of whole pile body, the spacing between adjacent spiral is 100mm～200mm, bar diameter 6mm～10mm.
Plain concrete pile body 6; Intensity is C15～C30, also can select different materials for use according to the stressed size of stake and stake footpath, can adopt cement paste or mortar to mix rubble during stake footpath 300mm～400mm; When stake footpath 400mm is above, adopt concrete; Pile body diameter is 300mm～1200mm.
When foundation ditch is dark, can adopt the piled anchor structure in the anchor formula campshed supporting and protection structure, referring to Fig. 2, the composite prestressed soil blocking pile forms piling structure by a determining deviation, and stake is connected through hat beam 9 with stake, forms cantilevered campshed supporting and protection structure; In foundation ditch, be provided with from top to bottom in 2 layers and support 12, horizontal support is erected between the two relative row campsheds, and horizontal support is connected and power transmission through waist rail 10 with the composite prestressed soil blocking pile, forms an anchor formula campshed supporting and protection structure; 9.0 meters of foundation depths.
Five prestress wire 1 symmetries of two groups of skeletons are positioned at the tensile region, both sides of reinforcing cage, see Fig. 5; The top of the every prestress wire 1 of two groups of skeletons is connecting ground tackle 8, sees Fig. 9, and the lower end of the every prestress wire 1 of two groups of skeletons is positioned at the through hole of ring flat-plate 7, sees Figure 10.
As shown in Figure 2,0.8 meter of this example stake bore dia, 2 meters of pile spacings, stake is long 12 meters, gets into following 3.5 meters of the sloping bottom surface of design.Because of having increased horizontal fulcrum; Excavation back all can produce moment of flexure with the native face of the back of the body meeting native face; The capital becomes the tensile region, so stressed vertical muscle respectively is provided with 4 Φ 20 with the native face of the back of the body meeting native face, simultaneously with the native face of the back of the body 5 prestress wires is set respectively meeting native face; See Fig. 5, the prestress wire model is ф 15.2 (7X ф 5).Perfusion C30 concrete in the stake hole.0.5 meter of hat deck-molding, wide 0.9 meter.The length of two-layer anchor pole is 15 meters, angle of inclination 15 degree, and 150 millimeters in aperture, first floor anchor pole absolute altitude is sloping end face 13 following 2.5 meters, and second layer anchor pole absolute altitude is sloping end face 13 following 5.5 meters, and anchor pole muscle material adopts 2 Φ 18.Rock bolt head is provided with elongated reinforced concrete waist rail, and the waist rail sectional dimension is 400x300.
Referring to Fig. 3 and Fig. 5, foundation ditch can adopt the inner supporting structure in the anchor formula campshed supporting and protection structure when more deeply and on every side soil property can't provide enough anchored force.Formed a line by a determining deviation by many composite prestressed soil blocking piles and to form colonnade formula piling structure, stake is connected through being preced with beam 9 with stake, formation cantilevered campshed supporting and protection structure; Oblique prestressed anchor 11 is set between adjacent composite prestressed soil blocking pile, and prestressed anchor anchors in the stake stable soil body behind, and prestressed anchor is connected and power transmission through waist rail 10 with stake, forms an anchor formula campshed supporting and protection structure, 10.0 meters of foundation depths.
As shown in Figure 3,0.9 meter of this example stake bore dia, 1.7 meters of pile spacings, stake is long 16 meters, gets into following 6.5 meters of the sloping bottom surface of design.Stressed vertical muscle respectively is provided with 4 Φ 20 with the native face of the back of the body meeting native face, simultaneously with the native face of the back of the body 5 prestress wires is set respectively meeting native face, sees Fig. 5, and the prestress wire model is ф 15.2 (7X ф 5).Perfusion C30 concrete in the stake hole.0.5 meter of hat deck-molding, wide 0.9 meter.Two horizontal supporting layers all adopts φ 609x10 steel pipe, and first floor supports absolute altitude sloping end face 13 following 0.5 meter, and second layer anchor pole absolute altitude is sloping end face 13 following 5.5 meters.
Claims (3)
1. the composite prestressed soil blocking pile comprises plain concrete pile body, reinforcing cage and skeleton, and skeleton is coaxial with the plain concrete pile body, and the plain concrete pile body is wrapped in reinforcing cage and skeleton; Said plain concrete pile body diameter is the 300-1200 millimeter; Said reinforcing cage comprises the vertical muscle that is distributed on the circumference, the ring stiffener of encircling vertical muscle and spiral shearing resistance stirrup, it is characterized in that: said skeleton comprises one group of skeleton or two groups of skeletons, and every group of skeleton is made up of the prestress wire more than three; The vertical muscle of the prestress wire of said skeleton and reinforcing cage is positioned at the tensile region of same circumference; The top of said every prestress wire is connecting ground tackle; The bottom of said reinforcing cage is connecting ring flat-plate, is laid with through hole on the ring flat-plate, and the lower end of said every prestress wire is positioned at the through hole of ring flat-plate.
2. according to the said composite prestressed soil blocking pile of claim 1, it is characterized in that: said one group of skeleton is positioned at a side tensile region of reinforcing cage, and said two groups of skeleton symmetries are positioned at the tensile region, both sides of reinforcing cage.
3. according to the said composite prestressed soil blocking pile of claim 1, it is characterized in that: be arranged with sleeve pipe on the said prestress wire, said sleeve pipe is a bellows.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110178190A CN102322060A (en) | 2011-06-29 | 2011-06-29 | Composite prestressing retaining pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110178190A CN102322060A (en) | 2011-06-29 | 2011-06-29 | Composite prestressing retaining pile |
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| CN102322060A true CN102322060A (en) | 2012-01-18 |
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| CN201110178190A Pending CN102322060A (en) | 2011-06-29 | 2011-06-29 | Composite prestressing retaining pile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012880A (en) * | 2017-02-24 | 2017-08-04 | 中铁二十五局集团第五工程有限公司 | A kind of pile pier structure of the empty rail of suspension type |
| CN107354947A (en) * | 2017-07-26 | 2017-11-17 | 广东工业大学 | One kind can adjust prestressed supporting pile structure and construction method |
| CN113062330A (en) * | 2021-05-10 | 2021-07-02 | 四川省交通勘察设计研究院有限公司 | Uneven reinforcement anti-slip pile with circular cross section |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2782762Y (en) * | 2005-01-31 | 2006-05-24 | 黄强 | Prestressed concrete hollow square section pile and tip of same |
| CN101220595A (en) * | 2008-01-24 | 2008-07-16 | 广东水电二局股份有限公司 | Application method of novel post-tensioned pre-stress soil blocking pile |
| CN201770978U (en) * | 2010-05-25 | 2011-03-23 | 张继红 | High-strength concrete open preformed pile and pile mold thereof |
| CN202194129U (en) * | 2011-06-29 | 2012-04-18 | 安徽省建设工程勘察设计院 | Composite prestress soil-blocking pile |
-
2011
- 2011-06-29 CN CN201110178190A patent/CN102322060A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2782762Y (en) * | 2005-01-31 | 2006-05-24 | 黄强 | Prestressed concrete hollow square section pile and tip of same |
| CN101220595A (en) * | 2008-01-24 | 2008-07-16 | 广东水电二局股份有限公司 | Application method of novel post-tensioned pre-stress soil blocking pile |
| CN201770978U (en) * | 2010-05-25 | 2011-03-23 | 张继红 | High-strength concrete open preformed pile and pile mold thereof |
| CN202194129U (en) * | 2011-06-29 | 2012-04-18 | 安徽省建设工程勘察设计院 | Composite prestress soil-blocking pile |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012880A (en) * | 2017-02-24 | 2017-08-04 | 中铁二十五局集团第五工程有限公司 | A kind of pile pier structure of the empty rail of suspension type |
| CN107354947A (en) * | 2017-07-26 | 2017-11-17 | 广东工业大学 | One kind can adjust prestressed supporting pile structure and construction method |
| CN113062330A (en) * | 2021-05-10 | 2021-07-02 | 四川省交通勘察设计研究院有限公司 | Uneven reinforcement anti-slip pile with circular cross section |
| CN113062330B (en) * | 2021-05-10 | 2022-09-09 | 四川省交通勘察设计研究院有限公司 | Uneven reinforcement anti-slip pile with circular cross section |
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Application publication date: 20120118 |