CN1246568A - Temporarily prestressed concrete tubular pile - Google Patents
Temporarily prestressed concrete tubular pile Download PDFInfo
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- CN1246568A CN1246568A CN 98113330 CN98113330A CN1246568A CN 1246568 A CN1246568 A CN 1246568A CN 98113330 CN98113330 CN 98113330 CN 98113330 A CN98113330 A CN 98113330A CN 1246568 A CN1246568 A CN 1246568A
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Abstract
The present invention discloses a post-expanding prestressed tubular concrete pile suitable for the foundation of building on soft ground. It is composed of main body, prestressing bars, pile tip head and top cover plate. The pile tip head and top cover plate are used as the prestress anchor of prestressing bars for applying prestress to pile before driving the pile. Said prestress is temporary. After the pile is driven into ground, the prestressing bars and top cover plate can be taken out for reuse. Its advantages are high quality of pile and saving steel.
Description
The present invention relates to a kind of prestressed concrete pipe pile that is applied in the building construction Foundation Design.
The a lot of tube-sinking cast-in-situ piles that adopt at present general building construction basis, it is low that this stake has cost, and stake is long can be with advantages such as ground variations.But quality accidents such as broken pile, bottleneck stake appear in this stake easily, particularly in containing the ground of soft layer.Adopt prestressed concrete pipe pile can overcome above-mentioned shortcoming, because prestressed concrete pile is a preformed pile, pile quality guarantees.But the prestressed concrete pile steel using amount is big, the cost height.
The purpose of this invention is to provide a kind of post stressed concrete pile tube.After stake is squeezed into soil and reached projected depth, prestressed reinforcement is taken out from stake, prestressed reinforcement and ancillary service thereof are reusable, have both saved steel, reduce cost, the assurance of getting back of the quality of stake.
In the piling process, stake very big longitudinal tension stress can occur under pile monkey hits, and tensile stress often surpasses pile concrete tensile strength, causes the stake fracture.Therefore, in order to offset and to reduce this tensile stress, must apply longitudinal prestressing to pile body.When piling finishes, drive piles to cause that tensile stress disappears, just there is no need to continue to keep the prestressing force of pile body, therefore, prestressed reinforcement can take out, to save steel.
The invention belongs to a kind of post stressed concrete pile tube, it partly is made up of pile tube body, prestressed reinforcement, stake point, pile cap decking four.
Pile body is the nonprestressed reinforcement concrete pipe, the merogenesis manufacturing, and every joint length is generally 9 meters, also will produce some stubs for collocation.Pile body must be made hollow, and prestressed reinforcement passes from the cavity of stake.The pile tube body can be used the centrifugal process manufacturing, and concrete grade requires more than No. 450, and pile body also can be prefabricated in the building site, and concrete grade requires more than No. 400.In order to satisfy transportation and lifting requirements, pile body will be joined a small amount of longitudinal reinforcement.Pile body lateral deformation when driving piles in order to resist, pile body will be joined circumferential reinforcement, closeer near stake end place circumferential reinforcement spacing, dredges in pile body interlude circumferential reinforcement spacing.Pile crown is subjected to the pile monkey hitting power big especially, and therefore, the steel-sheet cuff will be overlapped in pile body two.
Prestressed reinforcement adopts hard drawn wire reinforcement, and bar diameter is decided on the prestressing force design load.Major diameter reinforcing bar of the general employing of prestressed reinforcement can adopt many reinforcing bars when prestressing force is big.The purpose that adopts the major diameter reinforcing bar is because when reclaiming prestressed reinforcement, reverse prestressed reinforcement, and itself and the sharp screw of stake are broken away from, and therefore, presstressed reinforcing steel must have certain anti-torsion ability.As long as satisfy this anti-twisting property requirement, also can adopt other kind presstressed reinforcing steel, make presstressed reinforcing steel side by side and also be fine as adopting high-strength steel tow overcoat metal tube to do presstressed reinforcing steel or many non-major diameter reinforcing bars.
The stake point can also can weld with steel plate processing with reinforced concrete prefabricated; But here, the stake point is again a prestressed anchor, and stake ogival (or stake end steel plate) pre-buried screw (or discount) is so that be connected with prestressed reinforcement.Prestressed reinforcement passes the pile tube body, and ground tackle is made with the stake point in the lower end, and ground tackle is then made with pile cap decking in the upper end, and pile cap decking is connected with prestressed reinforcement by nut.When applying prestressing force, jack is the bearing prestressed reinforcement of tensioning with the pile cap decking.
Owing to lifting and transportation reason, every joint stake can not be done oversizely, is generally 9 meters, therefore, wants pile extension during piling construction.Pile extension can adopt two kinds of methods, and one is welding, promptly buries a small amount of steel plate underground at top, pile body two ends, during pile extension two joint pile crown alignment is welded; Another kind method is to adopt the sulphide mastic pile extension, is about to two joint stake longitudinal reinforcements to welding, and sulphide mastic is filled in the gap between stake.
Below in conjunction with accompanying drawing and specific embodiments the present invention is described in further details:
Fig. 1 is a pile tube body constructional drawing;
Fig. 2 is the sectional drawing of the pile tube body of Fig. 1;
Fig. 3 is the concrete pipe pile provided with temporary prestressing force constructional drawing;
Fig. 4 is jack tension figure when applying prestressing force.
As depicted in figs. 1 and 2, pile body diameter is 400 millimeters, and the pile tube wall thickness is 80 millimeters; No. 500, pile concrete adopts prefabricated by centrifugal process.Joining 8 diameters along tube wall is 10 millimeters longitudinal reinforcement [1], joins diameter and be 5 millimeters circumferential reinforcement [2], and in 1 meter scope of nearly stake end, the circumferential reinforcement spacing is 40 millimeters, and the circumferential reinforcement spacing of all the other pile body interludes is 80 millimeters.The stake end respectively overlaps steel sheet cuff [3], and steel plate thickness is 1.6 millimeters, and cuff is high 150 millimeters, external diameter and stake equal diameters.The connection steel plate [4] that pile extension is used is buried at stake top, two ends underground, connects 10 millimeters of steel plate thickness, and it links by dowel and pile concrete.
Fig. 3 is the concrete pipe pile provided with temporary prestressing force constructional drawing, and prestressed reinforcement [2] is that a diameter is 32 millimeters hard drawn wire reinforcements, and prestress value is 35 tons (350,000 Ns); The pre-buried lead screw of precast reinforced concrete piles point [4] [6]; Will box out in pile cap decking [3] center, so that prestressed reinforcement passes.When applying prestressing force, prestressed reinforcement [2] passes pile tube body [1], and the prestressed reinforcement lower end is connected with the sharp screw of stake [6], and the upper end is connected with pile cap decking [3] by nut [5].Fig. 4 is a jack tension prestressed reinforcement schematic diagram when applying prestressing force, and the stretching head of jack [7] is connected with prestressed reinforcement [2], does bearing with pile cap decking [3], prestressed reinforcement of tensioning [2]; The stretch-draw value is read by oil pressure gauge, reach the prestressing force design load after, tighten nut [5], unload jack [7], hang the stake and put pile cover, can drive piles.
9 meters of every joint pile lengths, one joint stake falls short of during construction, necessary pile extension during piling, pile extension adopts welding here.For first, second joint stake, butt joint welds on ground with two joint stakes earlier before the piling, and applies prestressing force, hangs on pile frame piling, and two joint stake maximum lengths are 18 meters.As falling short of with two joint stakes, then must on pile driving frame, connect the 3rd joint stake, the prestressing force of soon having squeezed into the stake of soil discharges, and takes out pile cap decking, the 3rd joint stake of having sling connects prestressed reinforcement, with two, three joint pile joints welding, again after applying prestressing force, unload jack, continue piling.
Below the present invention is made comparisons with driven cast-in-place pile and prestressed concrete pipe.
Such as above-mentioned example, stake diameter of the present invention is 400 millimeters (Fig. 1-3), 90 tons of single pile design bearing capacities (900,000 Ns); Every meter stake is long Degree concrete 0.08 side, 11 kilograms of steel; About 180 yuan of the unit length cost of stake (wherein the prefabricated pipe pile body is every meter about 100 yuan, transportation, Every meter about 80 yuan of the expenses such as piling).
Adopt driven cast-in-place pile, 480 millimeters of stake diameters, 60 tons of single pile design bearing capacities (600,000 Ns); Concrete 0.19 side is used in every meter stake, About 110 yuan of every meter long cost of stake.
To the eye, cost ratio driven cast-in-place pile height of the present invention, but further analyze, just find that both price differences are few; At first, the present invention Bearing capacity of single pile be 1.5 times of driven cast-in-place pile, namely one equals one and half; Secondly, pile framing volume of the present invention reduces, such as driven cast-in-place pile Be three pile framings, can change two pile framings into the present invention, the corresponding cushion cap cost that reduced; Therefore two kinds of pile foundation total costs roughly maintain an equal level, but To adopt the present invention can avoid occurring the quality accidents such as broken pile, bottleneck stake, particularly in soft soil foundation.
Compare with prestressed concrete pipe pile, advantage of the present invention is saving steel. Because: the longitudinal rib of (1) prestressed concrete pipe pile is to use High tensile reinforcement, and longitudinal rib of the present invention is only joined a small amount of regular reinforcement; (2) the stake end junction steel plate of prestressed concrete pipe pile is except using as pile extension Outside the member, or the ground tackle of prestressed reinforcement of tensioning, bearing very hightension, junction steel plate processes with 19 millimeters steel plate monoblocks, and steel using amount is big; Stake end junction steel plate of the present invention is the member that connects stake usefulness purely, and the consumption of steel plate greatly reduces. (3) after soil was squeezed in stake, there have to be a bit of unnecessary The stake want amputation, its length is from 1 meter to several meters. For prestressed concrete pipe pile, the stake prestressing force that blocks disappears, and broken pile is passed into disuse; But the present invention can block stake with two joints to be connected, and is about to the vertical muscle welding of two joint broken piles, with high-strength binding material bonding, becomes a stub between two broken piles Reuse.
Claims (3)
- (1) a kind of post stressed concrete pile tube, it is made up of pile tube body [1], prestressed reinforcement [2], stake point [4] and pile cap decking [3]; It is characterized in that the pile tube body is hollow, prestressed reinforcement [2] passes pile body [1] hollow parts, utilizes pile cap decking [3] and stake point [4] or stake end steel plate to do prestressed anchor, and pile body is applied prestressing force, and prestressing force is temporary transient; Stake is at building site merogenesis pile extension and squeeze in the soil, beaten a pile after, with this prestressing force release, taking-up prestressed reinforcement [2] and pile cap decking [3], prestressed reinforcement and pile cap decking can be repeatedly used.
- (2) described according to claim 1, it is characterized in that adopting the major diameter reinforcing bar to do prestressed reinforcement, or employing other steel identical with major diameter reinforcing bar torsional rigidity are done presstressed reinforcing steel.
- (3) described according to claim 1, it is characterized in that prestressed reinforcement [2] relies on screw or discount to be connected with stake point [4] or stake end steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113330 CN1246568A (en) | 1998-09-01 | 1998-09-01 | Temporarily prestressed concrete tubular pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113330 CN1246568A (en) | 1998-09-01 | 1998-09-01 | Temporarily prestressed concrete tubular pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1246568A true CN1246568A (en) | 2000-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98113330 Pending CN1246568A (en) | 1998-09-01 | 1998-09-01 | Temporarily prestressed concrete tubular pile |
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| CN (1) | CN1246568A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061335A (en) * | 2013-01-21 | 2013-04-24 | 中国十七冶集团有限公司 | Pile hole dirt preventing cast iron metal cover plate for prestressed concrete tubular pile and mounting method of pile hole dirt preventing cast iron metal cover plate |
| CN105319123A (en) * | 2015-03-16 | 2016-02-10 | 河南工业大学 | Multifunctional model test pile |
| CN105350531A (en) * | 2015-10-21 | 2016-02-24 | 葛建 | Pipe pile-anchor rod composite foundation capable of bearing pulling and pressing bidirectional loads and construction technology |
| CN106801428A (en) * | 2017-01-16 | 2017-06-06 | 青岛中天斯壮科技有限公司 | Reinforced tensile-shear PHC pipe pile foundation structure and construction method thereof |
| CN109826192A (en) * | 2019-03-08 | 2019-05-31 | 沈阳建筑大学 | A kind of prefabricated PC fender post |
| CN114368060A (en) * | 2021-12-22 | 2022-04-19 | 江苏海洋大学 | Production process of unbonded post-tensioning reusable prestressed tendon pipe pile |
-
1998
- 1998-09-01 CN CN 98113330 patent/CN1246568A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061335A (en) * | 2013-01-21 | 2013-04-24 | 中国十七冶集团有限公司 | Pile hole dirt preventing cast iron metal cover plate for prestressed concrete tubular pile and mounting method of pile hole dirt preventing cast iron metal cover plate |
| CN103061335B (en) * | 2013-01-21 | 2015-04-08 | 中国十七冶集团有限公司 | Pile hole dirt preventing cast iron metal cover plate for prestressed concrete tubular pile and mounting method of pile hole dirt preventing cast iron metal cover plate |
| CN105319123A (en) * | 2015-03-16 | 2016-02-10 | 河南工业大学 | Multifunctional model test pile |
| CN105319123B (en) * | 2015-03-16 | 2018-08-14 | 河南工业大学 | A kind of allpurpose model test pile |
| CN105350531A (en) * | 2015-10-21 | 2016-02-24 | 葛建 | Pipe pile-anchor rod composite foundation capable of bearing pulling and pressing bidirectional loads and construction technology |
| CN105350531B (en) * | 2015-10-21 | 2017-08-29 | 葛建 | The pile tube anchor pole composite foundation and construction technology of tension compression bidirectional load can be born |
| CN106801428A (en) * | 2017-01-16 | 2017-06-06 | 青岛中天斯壮科技有限公司 | Reinforced tensile-shear PHC pipe pile foundation structure and construction method thereof |
| CN106801428B (en) * | 2017-01-16 | 2018-11-20 | 青岛中天斯壮科技有限公司 | Reinforced tensile-shear PHC pipe pile foundation structure and construction method thereof |
| CN109826192A (en) * | 2019-03-08 | 2019-05-31 | 沈阳建筑大学 | A kind of prefabricated PC fender post |
| CN114368060A (en) * | 2021-12-22 | 2022-04-19 | 江苏海洋大学 | Production process of unbonded post-tensioning reusable prestressed tendon pipe pile |
| CN114368060B (en) * | 2021-12-22 | 2023-06-23 | 江苏海洋大学 | Production process of unbonded post-tensioning recyclable prestressed tendon pipe pile |
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