CN103174134A - Prestressed concrete pile with recoverable steel strands and construction method - Google Patents
Prestressed concrete pile with recoverable steel strands and construction method Download PDFInfo
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- CN103174134A CN103174134A CN2013101104840A CN201310110484A CN103174134A CN 103174134 A CN103174134 A CN 103174134A CN 2013101104840 A CN2013101104840 A CN 2013101104840A CN 201310110484 A CN201310110484 A CN 201310110484A CN 103174134 A CN103174134 A CN 103174134A
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Abstract
The invention provides a prestressed concrete pile with recoverable steel strands and construction method. The prestressed concrete pile comprises a concrete pile body, multiple vertical twisted steel ribs, multiple single-row type prestressed ribs, helical ribs, multiple outer ground tackles and multiple inner ground tackles, wherein the concrete pile body is of a cylindrical concrete structure. The multiple vertical twisted steel ribs and the multiple prestressed ribs are arranged along the periphery of the concrete pile body. The helical ribs are arranged on out sides of the vertical twisted steel ribs and the prestressed ribs in a colligation or welding mode. The inner ground tackles and the outer ground tackles are respectively installed at the lower end and the upper end of each steel strand. The prestressed concrete pile has the advantages that the cross section of the prestressed concrete pile is large in anti-bending rigidity and anti-bending bearing capacity, inward horizontal deformation of the prestressed concrete pile and sedimentation of a building can be reduced, the diameter of the cross section of the pile can be reduced, and the steel strands can be recycled, and resources are saved, so that the prestressed concrete pile saves resources, reduces construction cost of engineering, and is environmental-friendly.
Description
Technical field
The invention belongs to underground space Foundation Pit Support Engineering technical field, particularly relate to a kind of prestressed concrete pile and job practices of being furnished with recyclable steel strand.
Background technology
Reinforced concrete structure is under the effect of moment of flexure, structure tension side concrete can ftracture, if crack width is limited in the 0.2-0.25mm that allows, the tensile stress of reinforcing bar also can only reach 150-250MPa, this just makes high tensile reinforcement can't play one's part to the full in reinforced concrete structure, equally also can not bring into play the effect of high-strength concrete.And, the reinforced concrete structure of work with cracking, the concrete in tension zone material can not play one's part to the full, the rigidity of structure descends larger.High tensile reinforcement and high-strength concrete have higher cost performance.
Underground space foundation pit enclosure structure form often adopts multiple tracks support+reinforced concrete pile or multiple tracks prestressed anchor (anchor cable)+concrete-steel concrete pile at present.because the tensile strength of reinforcing bar is low, so amount of reinforcement is large, and reinforcing bar is not recyclable, in addition, under the soil pressure effect, the concrete of reinforced concrete pile tension side can produce the crack, the reinforced concrete pile cross section bending rigidity of work with cracking will obviously reduce, therefore, geological conditions is relatively poor when the place, when foundation ditch surrounding enviroment protection requirement is stricter, usually need to adopt to have larger diameter, the reinforced concrete pile that arrangement of reinforcement is more, so that reinforced concrete pile has enough bearing capacity and stiffness, guarantee that with this Underground Construction safety and the sedimentation of foundation ditch surrounding ground can be controlled in the allowed band value, will increase construction costs so undoubtedly.
Chinese patent application discloses foundation pit enclosure structure and the job practices of being furnished with presstressed reinforcing steel on a kind of vertical soil-baffling structure No. 201210245291.1, be the U font bottom the presstressed reinforcing steel in this foundation pit enclosure structure, and ground tackle is not installed in the bottom, therefore reclaiming presstressed reinforcing steel needs larger pulling capacity, so difficulty of construction is large.
In No. the 200420029700.5th, Chinese patent application, a kind of cast-in-place concrete pile that adopts steel bar for prestressed concrete is disclosed, the difference of this cast-in-place concrete pile and ordinary concrete stake is to adopt steel bar for prestressed concrete, owing to not applying prestressing force on rod iron, therefore pile body cracking resistance, tensile property are not improved, and rod iron is not recyclable.
Disclose multiple prestressed concrete pile and job practices in Chinese patent application the 01253503.6th, 03113753.9,01126590.6 and No. 200410081456.1, but that its common shortcoming is also presstressed reinforcing steel on it is not recyclable.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of cross section bending rigidity and bearing capacity large and can reduce the prestressed concrete pile of being furnished with recyclable steel strand and the job practices of construction costs.
In order to achieve the above object, the prestressed concrete pile of being furnished with recyclable steel hinge line provided by the invention comprises concrete pile body, many vertical indented barss, many single-column type presstressed reinforcing steels, spiral bar, a plurality of outer ground tackle and a plurality of interior ground tackles; Wherein the concrete pile body is the cylindrical concrete structure; Many vertical indented barss and Duo Gen presstressed reinforcing steel are along the periphery of concrete pile body; Spiral bar adopts the mode of colligation or welding to be arranged on the outside of vertical indented bars and presstressed reinforcing steel; The lower end of every steel hinge line and upper end are separately installed with an interior ground tackle and outer ground tackle.
Described vertical indented bars and presstressed reinforcing steel arrange in the mode that replaces along whole concrete pile body periphery; Or presstressed reinforcing steel is along the local periphery of concrete pile body, and all the other peripheries only configure vertical indented bars.
Described presstressed reinforcing steel is coated with the steel hinge line of one deck cosmoline fat and is enclosed within its outside bellows or plastic pipe forms by one or more surface.
The single periphery along the concrete pile body of described presstressed reinforcing steel, or many be in juxtaposition along the circumferential arrangement of concrete pile.
The diameter of described vertical indented bars is 14-36mm; the diameter of concrete pile body is 600-2500mm; the diameter of spiral bar is 10-22mm; the pitch of spiral bar is 80-300mm; strength grade of concrete is C30-C80, the thickness of concrete cover 50-70mm of presstressed reinforcing steel and vertical indented bars.
Job practices of being furnished with the prestressed concrete pile of recyclable steel hinge line provided by the invention comprises the following step that carries out in order:
1) at first adopt boring or manually digging hole to carry out the pore-forming operation along the predeterminated position of planning to build the underground structure outer rim;
2) with steel hinge line surface coating one deck cosmoline fat, then bellows or plastic pipe and form presstressed reinforcing steel on its outer cover, and an interior ground tackle is installed in the lower end of every presstressed reinforcing steel, the mode that adopts colligation or welding according to the structure of above-mentioned prestressed concrete pile is made into reinforcing cage with many vertical indented barss, many prestressing force and spiral bar;
3) insert respectively a reinforcing cage in each hole, then concrete perfusion in the stake hole, form the concrete pile body after the concrete setting sclerosis;
4) until above-mentioned concrete pile recuperate protect the intensity of designing requirement after, applying of reinforced concrete circle beam carried out at top at all concrete pile bodies, in this process, the upper end of vertical indented bars is extend in reinforced concrete circle beam, and stretch out outside the end face of reinforced concrete circle beam the upper end of presstressed reinforcing steel;
5) until the reinforced concrete circle beam maintenance after the intensity of designing requirement, utilize tension tool to carry out stretch-draw to steel hinge line, adopt outer ground tackle the upper end of presstressed reinforcing steel to be anchored at the end face of reinforced concrete circle beam, thereby complete, prestressed concrete pile is applied prestressing force;
6) beginning pit earthwork excavation and underground structure apply, and after the underground structure in foundation ditch applies and completes, utilize tension tool with the outer ground tackle removal of steel hinge line upper end, to remove the stretching force on presstressed reinforcing steel;
7) repeatedly beat the upper end of steel hinge line with hand hammer, so that the elastic clip on interior ground tackle is peeled off from the lower end of steel hinge line;
8) hold the upper end of steel hinge line and it is extracted out reclaimed from the concrete pile body, can complete the described work progress of being furnished with the prestressed concrete pile of recyclable steel hinge line.
Prestressed concrete pile and job practices of being furnished with recyclable steel hinge line provided by the invention has following beneficial effect:
(1) because prestressed concrete pile has been applied in prestressing force, so the cross section bending rigidity is large, therefore be conducive to reduce the sedimentation of the inside horizontal distortion of prestressed concrete pile and the outer ground of foundation ditch or building;
(2) until the complete rear recyclable steel hinge line of Underground Construction and recycling, therefore can saving resource, reduce construction costs;
(3) prestressed concrete pile of being furnished with steel hinge line can adopt larger reinforcement ratio, improves significantly the stake anti-bending bearing capacity, therefore can reduce concrete amount and boring expense, thereby reduces engineering cost, environmental protection.
Description of drawings
Fig. 1 be prestressed concrete pile provided by the invention with together with vertical structure sectional view during the stull coupling;
Fig. 2 is the vertical structure sectional view that prestressed concrete pile provided by the invention adopts cantilevered fashion;
Vertical structure sectional view when Fig. 3 is prestressed concrete pile provided by the invention and four road stull couplings;
Fig. 4 is the prestressed concrete pile structural section schematic diagram that vertical indented bars and presstressed reinforcing steel arrange along whole periphery.
Fig. 5 is the prestressed concrete pile structural section schematic diagram that presstressed reinforcing steel arranges along local periphery.
Fig. 6 is the prestressed concrete pile structural section schematic diagram that presstressed reinforcing steel is set up in parallel.
Fig. 7 is spiral bar structural representation in prestressed concrete pile;
Fig. 8 has presstressed reinforcing steel structure sectional view in the prestressed concrete pile of a steel hinge line.
Fig. 9 has presstressed reinforcing steel structure sectional view in the prestressed concrete pile of many steel hinge lines.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, prestressed concrete pile and job practices of being furnished with recyclable steel hinge line provided by the invention is elaborated.
As Fig. 1-shown in Figure 9, the prestressed concrete pile of being furnished with recyclable steel hinge line provided by the invention comprises concrete pile body 1, many vertical indented barss 4, many single-column type presstressed reinforcing steels 5, spiral bar 6, a plurality of outer ground tackle 9 and a plurality of interior ground tackles 10; Wherein concrete pile body 1 is the cylindrical concrete structure, and vertical indented bars 4 and presstressed reinforcing steel 5 are the vertical applied force muscle, and the number needs of vertical indented bars 4 and presstressed reinforcing steel 5 is determined according to Force Calculation; Many vertical indented barss 4 and Duo Gen presstressed reinforcing steel 5 are along the periphery of concrete pile body 1; Spiral bar 6 adopts the mode of colligation or welding to be arranged on the outside of vertical indented bars 4 and presstressed reinforcing steel 5; The lower end of every presstressed reinforcing steel 5 and upper end are separately installed with an interior ground tackle 10 and outer ground tackle 9.The concrete structure of interior ground tackle 10 can be referring to disclosed content in No. the 200710117673.5th, Chinese patent application.
Described vertical indented bars 4 and presstressed reinforcing steel 5 arrange in the mode that replaces along whole concrete pile body 1 periphery; Or presstressed reinforcing steel 5 is along the local periphery of concrete pile body 1 and all the other peripheries only configure vertical indented bars 4.
Described presstressed reinforcing steel 5 is comprised of steel hinge line 7 and cover bellows or the plastic pipe 11 externally that one or more surface is coated with one deck cosmoline fat.
The single periphery along concrete pile body 1 of described presstressed reinforcing steel 5, or many be in juxtaposition along the circumferential arrangement of concrete pile 1.
The diameter of described vertical indented bars 4 is 14-36mm; the diameter of concrete pile body 1 is 600-2500mm; the diameter of spiral bar 6 is 10-22mm; the pitch of spiral bar 6 is 80-300mm; strength grade of concrete is C30-C80, the thickness of concrete cover 50-70mm of presstressed reinforcing steel 5 and vertical indented bars 4.
Job practices of being furnished with the prestressed concrete pile of recyclable steel hinge line provided by the invention comprises the following step that carries out in order:
1) at first adopt boring or manually digging hole to carry out the pore-forming operation along the predeterminated position of planning to build the underground structure outer rim;
2) with steel hinge line 7 surface coating one deck cosmoline fat, then bellows or plastic pipe 11 and form presstressed reinforcing steel 5 on its outer cover, and an interior ground tackle 10 is installed in the lower end of every presstressed reinforcing steel 5, the mode that adopts colligation or welding according to the structure of above-mentioned prestressed concrete pile is made into reinforcing cage with many vertical indented barss 4, many steel hinge lines 5 and spiral bar 6;
3) insert respectively a reinforcing cage in each hole, then concrete perfusion in the stake hole, form concrete pile body 1 after the concrete setting sclerosis;
4) until above-mentioned concrete pile body 1 maintenance after the intensity of designing requirement, applying of reinforced concrete circle beam 3 carried out at top at all concrete pile bodies 1, in this process, the upper end of vertical indented bars 4 is extend in reinforced concrete circle beam 3, and stretch out outside the end face of reinforced concrete circle beam 3 upper end of presstressed reinforcing steel 5;
5) until reinforced concrete circle beam 3 maintenances after the intensity of designing requirement, utilize tension tool to carry out stretch-draw to steel hinge line 7, adopt outer ground tackle 9 upper end of presstressed reinforcing steel 5 to be anchored at the end face of reinforced concrete circle beam 3, thereby complete, prestressed concrete pile is applied prestressing force;
6) beginning pit earthwork excavation and underground structure apply, and after the underground structure in foundation ditch applies and completes, utilize tension tool with outer ground tackle 9 removals of steel hinge line 7 upper ends, to remove the stretching force on presstressed reinforcing steel 5;
7) repeatedly beat the upper end of steel hinge line 7 with hand hammer, so that the elastic clip on interior ground tackle 10 is peeled off from the lower end of steel hinge line 7;
8) hold the upper end of steel hinge line 7 and it is extracted out reclaimed from concrete pile body 1, can complete the described work progress of being furnished with the prestressed concrete pile of recyclable steel hinge line.
Claims (6)
1. prestressed concrete pile of being furnished with recyclable steel strand, it is characterized in that: described prestressed concrete pile comprises concrete pile body (1), many vertical indented barss (4), many single-column type presstressed reinforcing steels (5), spiral bar (6), a plurality of outer ground tackle (9) and a plurality of interior ground tackle (10); Wherein concrete pile body (1) is the cylindrical concrete structure; Many vertical indented barss (4) and many presstressed reinforcing steels (5) are along the periphery of concrete pile body (1); Spiral bar (6) adopts the mode of colligation or welding to be arranged on the outside of vertical indented bars (4) and presstressed reinforcing steel (5); The lower end of every steel hinge line (7) and upper end are separately installed with an interior ground tackle (10) and outer ground tackle (9).
2. the prestressed concrete pile of being furnished with recyclable steel strand according to claim 1 is characterized in that: described vertical indented bars (4) and presstressed reinforcing steel (5) arrange in the mode that replaces along whole concrete pile body (1) periphery; Or presstressed reinforcing steel (5) is along the local periphery of concrete pile body (1) and all the other peripheries only configure vertical indented bars (4).
3. the prestressed concrete pile of being furnished with recyclable steel strand according to claim 1 is characterized in that: described presstressed reinforcing steel (5) is coated with the steel strand (7) of one deck cosmoline fat by one or more surface and is enclosed within its outside bellows or plastic pipe (11) forms.
4. the prestressed concrete pile of being furnished with recyclable steel strand according to claim 1, it is characterized in that: the single periphery along concrete pile body (1) of described presstressed reinforcing steel (5), or many be in juxtaposition along the circumferential arrangement of concrete pile (1).
5. the prestressed concrete pile of being furnished with recyclable steel strand according to claim 1; it is characterized in that: the diameter of described vertical indented bars (4) is 14-36mm; the diameter of concrete pile body (1) is 600-2500mm; the diameter of spiral bar (6) is 10-22mm; the pitch of spiral bar (6) is 80-300mm; strength grade of concrete is C30-C80, the thickness of concrete cover 50-70mm of presstressed reinforcing steel (5) and vertical indented bars (4).
6. job practices of being furnished with the prestressed concrete pile of recyclable steel strand as claimed in claim 1, it is characterized in that: described job practices comprises the following step that carries out in order:
1) at first adopt boring or manually digging hole to carry out the pore-forming operation along the predeterminated position of planning to build the underground structure outer rim;
2) with steel strand (7) surface coating one deck cosmoline fat, then bellows or plastic pipe (11) and form presstressed reinforcing steel (5) on its outer cover, and in the lower end of every steel hinge line (7), an interior ground tackle (10) is installed, according to the structure employing colligation of above-mentioned prestressed concrete pile or the mode of welding, many vertical indented barss (4), many presstressed reinforcing steels (5) and spiral bar (6) are made into reinforcing cage;
3) insert respectively a reinforcing cage in each hole, then concrete perfusion in the stake hole, form concrete pile body (1) after the concrete setting sclerosis;
4) until above-mentioned concrete pile body (1) maintenance after the intensity of designing requirement, applying of reinforced concrete circle beam (3) carried out at top at all concrete pile bodies (1), in this process, the upper end of vertical indented bars (4) is extend in reinforced concrete circle beam (3), and stretch out outside the end face of reinforced concrete circle beam (3) upper end of presstressed reinforcing steel (5);
5) until reinforced concrete circle beam (3) maintenance after the intensity of designing requirement, utilize tension tool to carry out stretch-draw to steel hinge line (7), adopt outer ground tackle (9) upper end of presstressed reinforcing steel (5) to be anchored at the end face of reinforced concrete circle beam (3), thereby complete, concrete pile is applied prestressing force;
6) beginning pit earthwork excavation and underground structure apply, and after the underground structure in foundation ditch applies and completes, utilize tension tool with outer ground tackle (9) removal of steel hinge line (7) upper end, to remove the stretching force on presstressed reinforcing steel (5);
7) repeatedly beat the upper end of steel strand (7) with hand hammer, so that the elastic clip on interior ground tackle (10) is peeled off from the lower end of steel strand (7);
8) hold the upper end of steel strand (7) and its extraction from concrete pile body (1) is reclaimed, can complete the described work progress of being furnished with the prestressed concrete pile of recyclable steel strand.
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| CN201310110484.0A CN103174134B (en) | 2013-04-01 | 2013-04-01 | Prestressed concrete pile with recoverable steel strands and construction method |
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| CN201310110484.0A CN103174134B (en) | 2013-04-01 | 2013-04-01 | Prestressed concrete pile with recoverable steel strands and construction method |
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| CN103174134B CN103174134B (en) | 2015-06-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366289A (en) * | 2017-06-29 | 2017-11-21 | 宁波冶金勘察设计研究股份有限公司 | Foundation ditch concrete support pilework that live borehole pours and preparation method thereof |
| CN109024570A (en) * | 2018-06-05 | 2018-12-18 | 上海建工集团股份有限公司 | Recyclable group's beam post-tensioning prestressing without bondn drill-pouring supporting pile structure and method |
| CN109706922A (en) * | 2019-02-25 | 2019-05-03 | 浙江中桥预应力设备有限公司 | Using the steel reinforcement cage of Recyclable anchor rope, foundation pit enclosure stake and construction method |
| CN109706924A (en) * | 2018-12-30 | 2019-05-03 | 浙江工业大学 | A kind of prestressing force foundation pit enclosure cast-in-situ bored pile |
| CN109944254A (en) * | 2019-04-22 | 2019-06-28 | 重庆大学 | A kind of cast-type prestressed concrete pit supporting construction and its construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366289A (en) * | 2017-06-29 | 2017-11-21 | 宁波冶金勘察设计研究股份有限公司 | Foundation ditch concrete support pilework that live borehole pours and preparation method thereof |
| CN109024570A (en) * | 2018-06-05 | 2018-12-18 | 上海建工集团股份有限公司 | Recyclable group's beam post-tensioning prestressing without bondn drill-pouring supporting pile structure and method |
| CN109706924A (en) * | 2018-12-30 | 2019-05-03 | 浙江工业大学 | A kind of prestressing force foundation pit enclosure cast-in-situ bored pile |
| CN109706922A (en) * | 2019-02-25 | 2019-05-03 | 浙江中桥预应力设备有限公司 | Using the steel reinforcement cage of Recyclable anchor rope, foundation pit enclosure stake and construction method |
| CN109944254A (en) * | 2019-04-22 | 2019-06-28 | 重庆大学 | A kind of cast-type prestressed concrete pit supporting construction and its construction method |
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| CN103174134B (en) | 2015-06-24 |
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Effective date of registration: 20180614 Address after: 300000 Tianjin free trade zone (Airport Economic Zone), 2-3116 South Road 88. Patentee after: CHINA RAILWAY LIUYUAN GROUP CO., LTD. Address before: 300133 new Hongqiao Yi Fu Li 1, Hongqiao District, Tianjin Patentee before: Zhongtie Tunnel Survey and Design Inst., Ltd. |