CN101818498B - Prestressed reinforced concrete rectangular hollow pile with internal meshing structure and processing method thereof - Google Patents
Prestressed reinforced concrete rectangular hollow pile with internal meshing structure and processing method thereof Download PDFInfo
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- CN101818498B CN101818498B CN201010170582XA CN201010170582A CN101818498B CN 101818498 B CN101818498 B CN 101818498B CN 201010170582X A CN201010170582X A CN 201010170582XA CN 201010170582 A CN201010170582 A CN 201010170582A CN 101818498 B CN101818498 B CN 101818498B
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Abstract
The invention relates to a prestressed reinforced concrete rectangular hollow pile comprising a rectangular pile body and a rectangular metal endplate, wherein the rectangular pile body comprises a reinforcing cage and concrete, the axial direction of the rectangular pile body is provided with a through circular center hole, the rectangular metal endplate corresponding to the circular center hole of the rectangular pile body is arranged on both ends of the rectangular pile body, a circular center hole is arranged on the rectangular metal endplate, the internal wall of the circular center hole of the rectangular pile body is provided with an inner thread structure or an internal groove structure or denticulate bulges or a plurality of pits or a plurality of projections in order to reinforce the combining power of the reinforced concrete of the lower extension part of a building bearing table and the circular center holes of the prestressed reinforced concrete rectangular hollow pile. The prestressed reinforced concrete rectangular hollow pile effectively solves the problem that the reinforced concrete of the lower extension part of the building bearing table slips from the circular center holes of the prestressed reinforced concrete rectangular hollow pile, practically avoids the danger that a building on the bearing table shakes and swings to fall down under the action of external force and has high safety. The rectangular pile body is processed by a conventional method, the inner thread structure or the internal groove structure of the internal wall is processed by a cutting or extruding method, and the processing method has simple processing technology, low cost and high efficiency.
Description
Technical field:
The present invention relates to concrete pile and processing method thereof, particularly prestressed reinforced concrete rectangular hollow pile and processing method thereof.
Background technology:
Existing prestressed reinforced concrete rectangular hollow pile, as Chinese patent " pre-stressed concrete hollow square stake and moulding form thereof ", the patent No. is 200910027814.3, " pre-stressed concrete hollow square stake; comprise square pile body and square metal end plate; square pile body contains reinforcing cage; concrete; the center hole that a perforation is axially arranged of square pile body; the square metal end plate is arranged on the two ends of square pile body, corresponding with the center hole on the square pile body, also be provided with center hole on the square metal end plate, the periphery of square metal end plate is provided with bevel for welding, is provided with anchor hole on the square metal end plate symmetrically; Reinforcing cage comprises main muscle and stirrup, and stirrup shape in the shape of a spiral is welded on the main muscle; Four arms of angle of square pile body and square metal end plate are the circular arc arm of angle that radius equates, are convenient to the pre-stressed concrete hollow square stake in the demoulding from its processing mold successfully of process king-pile physical efficiency, can guarantee not damage simultaneously the arm of angle of pile body." when this prestressed reinforced concrete hollow square pile uses; the top concrete bearing platform connects with steel concrete by placing steel concrete in square pile center circular hole; because the bound fraction of the center hole of the concrete of the downward part of cushion cap and prestressed reinforced concrete hollow square pile is the smooth face of cylinder; both adhesions are not strong; the building on the cushion cap is under the external force effect that wind load or differential settlement etc. causes; the concrete that may produce the downward part of cushion cap is extracted from the center hole of prestressed reinforced concrete hollow square pile, the danger that building on the cushion cap just might take place to cover, poor stability.The processing method of existing prestressed reinforced concrete rectangular hollow pile may further comprise the steps: the preparation reinforcing cage; The preparation high performance concrete; Prepare mould, and on mould separant coating; Be installed in reinforcing cage on the mould and tighten tensioning equipment; Feed in the punching block high performance concrete for preparing and the half module that closes; Bending resistance grade by product is carried out pre-stretch-draw to reinforcing bar, locks anchoring after reaching requirement; Put into and carry out centrifugal treating on the centrifuge, pour out surplus slurry; Adopt the demoulding after common steam maintenance moulding or the steam curing at high pressure moulding by the different strength grade requirement of concrete; Finished product is stacked and nature or water curing some cycles on request.
Summary of the invention:
The objective of the invention is to overcome the deficiencies in the prior art, a kind of prestressed reinforced concrete rectangular hollow pile and processing method thereof that steel concrete combines with prestressed reinforced concrete rectangular hollow pile firmly, safety is good that can make the downward part of cushion cap is provided.
Solution of the present invention: prestressed reinforced concrete rectangular hollow pile, comprise rectangular pile body and rectangular metal end plate, rectangular pile body contains reinforcing cage, concrete, the center hole that a perforation is axially arranged of rectangular pile body, the rectangular metal end plate is arranged on the two ends of rectangular pile body, corresponding with the center hole on the rectangular pile body, also be provided with center hole on the rectangular metal end plate; Female thread structure or inner trough structure or detent projection thing or some pits or some projections are arranged on the inwall of the center hole of rectangular pile body, make the adhesion of center hole of the steel concrete of the downward part of cushion cap and prestressed reinforced concrete rectangular hollow pile strong, building on the cushion cap is under the external force effect that wind load or differential settlement etc. causes, the not danger that can take place to cover, safety is good.
The tooth depth of internal thread is the 10-30 millimeter.
The cross section of rectangular pile body is a square or rectangular, its four angles be shaped as four equal circular arcs, or four right angles that equate, or circular arc mixes setting with the right angle, or orthodrome mixes setting with the roundlet arc.
Inside groove is some inner grooves of separate setting, or is the inside spin annular groove.
The degree of depth of the cell body of inside groove or inside spin annular groove is the 10-30 millimeter.
Inner groove is set to be parallel to each other, or intersects mutually.
Angle between the symmetrical section of inner groove and the center line of the center hole on the rectangular pile body is 20--90 °.
The shape of cross section of inner groove is rectangle or trapezoidal or triangle or circular arc or the trough rim that is made of inner groove some planes, cambered surface.
Angle between two trough rims of the cross section of trapezoidal inner groove is 5--120 °.
The last base of the cross section of trapezoidal inner groove and the length between the bottom are than being 0.1-0.99.
Advantage of the present invention is: after using the present invention, the steel concrete of the downward part of cushion cap and the adhesion of center hole of the present invention are strong, solved the problem of steel concrete slippage from center hole of the present invention of the downward part of cushion cap effectively, conscientiously the danger covered takes place to have prevented that building on the cushion cap from rocking under external force or swinging, safety is good
The cutting working method of the prestressed reinforced concrete rectangular hollow pile of band internal thread or inner trough structure, rectangular pile body is by existing conventional method processing, after rectangular pile body is through the centrifuge processing and forming, carry out the internal thread of rectangular pile body or the processing of inner trough structure before entering concrete initial set, comprising the steps: that rectangular pile body is driven by centrifuge does gyration, the relative rectangular pile body of processing knife bar does axially and radial motion enters processing stations, adjust allowance, the processing knife bar is done the axial feed cutting along rectangular pile body, after the processing knife bar is finished cutting, the processing knife bar is radially withdrawing from along rectangular pile body earlier, along axially the withdrawing from of rectangular pile body, the concrete chip that cutting produces enters debris collection device and reclaims again.
The extrusion modling processing method of the prestressed reinforced concrete rectangular hollow pile of band internal thread or inner trough structure, rectangular pile body is by existing conventional method processing, after rectangular pile body is through the centrifuge processing and forming, carry out the internal thread of rectangular pile body or the processing of inner trough structure before entering concrete initial set, comprising the steps: that rectangular pile body is driven by centrifuge does gyration, installed that the relative rectangular pile body of processing knife bar that some moulding roll is done axially and radial motion enters processing stations, according to allowance, the processing knife bar is made radial feed along rectangular pile body, inner surface to the center hole of rectangular pile body carries out squeeze job, after the processing knife bar is finished squeeze job, processing knife bar elder generation radially withdraws from along rectangular pile body, again axially withdrawing from along rectangular pile body.
Advantage of the present invention is: processing technology is simple, cost is low, efficient is high.
Description of drawings:
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the embodiment of the invention 1 and cushion cap syndeton schematic diagram;
Fig. 4 is the structural representation of the embodiment of the invention 2;
Fig. 5 is the structural representation of the rectangle inner groove 20 of the embodiment of the invention 2;
Fig. 6 is the structural representation of the trapezoidal inner groove 21 of the embodiment of the invention 2;
Fig. 7 is the structural representation of the triangle inner groove 22 of the embodiment of the invention 2;
Fig. 8 is the structural representation of the circular arc inner groove 23 of the embodiment of the invention 2;
Fig. 9 is the structural representation that the broken line of the embodiment of the invention 2 constitutes the inner groove 24 of trough rim;
Figure 10 is the straight line of the embodiment of the invention 2 and the structural representation that circular arc line constitutes the inner groove 25 of trough rim;
Figure 11 is the I portion enlarged drawing of Fig. 4;
Figure 12 is the B-B sectional view of Fig. 4;
Figure 13 is the embodiment of the invention 2 and cushion cap syndeton schematic diagram;
Figure 14 is the structural representation of the embodiment of the invention 3;
Figure 15 is the C-C sectional view of Fig. 1;
Figure 16 is the structural representation of the embodiment of the invention 4;
Figure 17 is the structural representation of the embodiment of the invention 5;
Figure 18 is the structural representation of the embodiment of the invention 6.
Among the figure: 1-pile body center hole; 2-metal end plate center hole; The 3-screw thread; 4-square-shaped metal end plate; The 5-reinforcing cage; The 6-concrete; 7-square pile body; 8-holds in the palm basket; The downward part of 9-cushion cap; 10-cushion cap reinforcing cage; The 11-cushion cap; The 12-inner groove; 13-ring-type projection; 14-rectangle pile body; 15-inside spin annular groove; 16-rectangle pile body center hole; 17-intersection inside spin annular groove; The 18-pit; The 19-projection; 20-rectangle inner groove; The trapezoidal inner groove of 21-; 22-triangle inner groove; 23-circular arc inner groove; The 24-broken line constitutes the inner groove of trough rim; 25-straight line and circular arc line constitute the inner groove of trough rim.
The specific embodiment:
Among Fig. 1, be included as square pile body 7 and square-shaped metal end plate 4, four angles of square pile body 7 be shaped as four equal circular arcs, square pile body 7 contains reinforcing cage 5, concrete 6, the pile body center hole 1 that a perforation is axially arranged of square pile body 7, square-shaped metal end plate 4 is arranged on the two ends of square pile body 7, corresponding with the pile body center hole 1 on the square pile body 7, also be provided with metal end plate center hole 2 on the square-shaped metal end plate 4, the periphery of square-shaped metal end plate 4 is provided with bevel for welding, is provided with anchor hole on the square-shaped metal end plate 4 symmetrically; The arc radius of four arms of angle of square pile body 7 and square-shaped metal end plate 4 equates, is convenient to the stake of prestressed reinforced concrete open squares in the demoulding from its processing mold successfully of process king-pile physical efficiency, can guarantee not damage simultaneously the arm of angle of pile body; The inwall of the pile body center hole 1 of one end of square pile body 7 is provided with screw thread 3, the axial length of screw thread 3 is 1000 millimeters, the degree of depth of the thread of screw thread 3 is 15 millimeters, another selection scheme of screw thread tooth depth of internal thread 3 is 15 millimeters, and another selection scheme of screw thread tooth depth of internal thread 3 is 25 millimeters.The circular arc outermost at the arm of angle place of square pile body 7 equals the distance of the periphery of square pile body 7 to the main muscle outside of reinforcing cage 5 right-angle sides to the distance in the outside of the main muscle in reinforcing cage bight; the concrete cover thickness that has guaranteed reinforcing cage 5 each main muscle outer wrapping is even; the tension stress unanimity of the main muscle after the pile body moulding is put, pile body is attractive in appearance, intensity is high.
Among Fig. 2; the circular arc outermost at the arm of angle place of square pile body 7 is to the distance in the outside of the main muscle in reinforcing cage 5 bights; the arc radius R that is to say square pile body 7 arms of angle is: for 300 millimeters * 300 millimeters square pile body 7; R is 15 millimeters; square pile body 7 for 400 millimeters * 400 millimeters; R is 20 millimeters; for 600 millimeters * 600 millimeters square pile bodies 7; R is 40 millimeters; error between the arc radius of four arms of angle of same square pile body 7 is less than 2 millimeters; error is more little; the thickness of concrete cover of reinforcing cage 5 each main muscle outer wrapping is even more; the tension stress of the main muscle after square pile body 7 moulding are put is consistent more, and square pile body 7 intensity are high more, are unlikely to make square pile body 7 produce flexural deformations and the crack occur.
In work progress, cushion cap reinforcing cage 10 is erected at the end that screw thread 3 is arranged on the square pile body 7, to ask basket 8 to put into the pile body center hole 1 of square pile body 7 again, the position of the base plate on the holder basket 8 must not exceed the position that screw thread 3 is arranged on the square pile body 7, holder basket 8 tops are fixedly connected on the cushion cap reinforcing cage 10, at last, in cushion cap reinforcing cage 10 and holder basket 8, inject concrete, after the concrete setting, cushion cap 11 is solidified as a whole with the downward part 9 of cushion cap, the downward part 9 of cushion cap is solidified as a whole by screw thread on the square pile body 73 and square pile body 7, thereby has realized that cushion cap 11 firmly is connected with square pile body 7.As shown in Figure 3.
Among Fig. 4, comprise square pile body 7 and square-shaped metal end plate 4, four angles of square pile body 7 are that a pair of circular arc and a pair of right angle are symmetrical arranged, square pile body 7 contains reinforcing cage 5, concrete 6, the pile body center hole 1 that a perforation is axially arranged of square pile body 7, square-shaped metal end plate 4 is arranged on the two ends of square pile body 7, corresponding with the pile body center hole 1 on the square pile body 7, also be provided with metal end plate center hole 2 on the square-shaped metal end plate 4, the periphery of square-shaped metal end plate 4 is provided with bevel for welding, is provided with anchor hole on the square-shaped metal end plate 4 symmetrically; The inwall of the pile body center hole 1 of one end of square pile body 7 is provided with inner groove 12, the length that the inwall of pile body center hole 1 is provided with the part of inner groove 12 is 2000 millimeters, the groove depth of inner groove 12 is 20 millimeters, another selection scheme of the groove depth of inner groove 12 is 15 millimeters, and another selection scheme of the groove depth of inner groove 12 is 30 millimeters.The processing mode of inner groove 12 is with embodiment 1.The shape of cross section selection scheme one of inner groove 12: the shape of cross section of inner groove 12 is a rectangle, is provided with some rectangle inner grooves 20 (as Fig. 5) on the inwall of the pile body center hole 1 of square pile body 7 one ends.Scheme two: the shape of cross section of inner groove 12 is trapezoidal, on the inwall of the pile body center hole 1 of square pile body 7 one ends, be provided with some trapezoidal inner grooves 21 (as Fig. 6), angle β between the dual-side of the cross section of trapezoidal inner groove 21 is chosen as 30 °, another of angle β is chosen as 60 °, and another of angle β is chosen as 100 °; The last base of the cross section of trapezoidal inner groove 21 and the length ratio between the bottom are 0.2; The last base of the cross section of trapezoidal inner groove 21 and the length ratio between the bottom are 0.6; Another of the last base of the cross section of trapezoidal inner groove 21 and the length ratio between the bottom is chosen as 0.9.Scheme three: the shape of cross section of inner groove 12 is a triangle, is provided with some triangle inner grooves 22 (as Fig. 7) on the inwall of the pile body center hole 1 of square pile body 7 one ends.Scheme four: the shape of cross section of inner groove 12 is a circular arc, is provided with some circular arc inner grooves 23 (as Fig. 8) on the inwall of the pile body center hole 1 of square pile body 7 one ends.Scheme five: the shape of cross section of inner groove 12 is for being made of the trough rim of inner groove some straight lines, camber line line segment, is provided with the inner groove 24 (as Fig. 9) that some broken lines constitute trough rims on the inwall of the pile body center hole 1 of square pile body 7 one ends.On the inwall of the pile body center hole 1 of square pile body 7 one ends, be provided with the inner groove 25 (as Figure 10) that straight line and circular arc line constitute trough rim.
Among Figure 11, the angle α between the center line of the pile body center hole 1 on the symmetrical section of inner groove 12 and the square pile body 7 is 90 °, and another selection scheme of angle α is 25 °, and another selection scheme of angle α is 70 °.
Among Figure 12, four angles of square pile body 7 are that a pair of circular arc and a pair of right angle are symmetrical arranged, and the arc radius of a pair of arc chord angle equates, for 300 millimeters * 300 millimeters square pile body 7, arc radius R
1Be 15 millimeters, for 400 millimeters * 400 millimeters square pile body 7, R
1Be 20 millimeters, for 600 millimeters * 600 millimeters square pile bodies 7, R
1Be 40 millimeters.
Among Figure 13, building in the process of cushion cap 11, the ring-type projection 13 that forms on the downward part 9 of cushion cap is an one with inner groove 12 interlocks on the square pile body 7, has realized that cushion cap 11 firmly is connected with square pile body 7.
Among Figure 14, the inwall of the rectangle pile body center hole 16 of one end of rectangle pile body 14 is provided with inside spin annular groove 15, the length that the inwall of rectangle pile body center hole 16 is provided with the part of inside spin annular groove 15 is 1800 millimeters, the groove depth of inside spin annular groove 15 is 20 millimeters, another selection scheme of the groove depth of inside spin annular groove 12 is 15 millimeters, and another selection scheme of the groove depth of inside spin annular groove 15 is 30 millimeters.The processing mode of inside spin annular groove 15 is with embodiment 1.The selection of the cross sectional shape of the groove of inside spin annular groove 15 is as shown in Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10 among the embodiment 2.
Among Figure 15, four angles of rectangle pile body 14 are that a pair of orthodrome and a pair of little circular arc are symmetrical arranged, and the arc radius of a pair of great circle arc angle equates, for 300 millimeters * 500 millimeters rectangle pile body 14, arc radius R
2Be 15 millimeters, for 400 millimeters * 600 millimeters rectangle pile body 14, R
2Be 20 millimeters, for the square pile body 14 of 600 millimeters * 700 millimeters long, R
2Be 40 millimeters.The arc radius of a pair of little arc chord angle equates, for 300 millimeters * 500 millimeters rectangle pile body 14, arc radius R
3Be 5 millimeters, for 400 millimeters * 600 millimeters rectangle pile body 14, R
3Be 8 millimeters, for the square pile body 14 of 600 millimeters * 700 millimeters long, R
3Be 10 millimeters.
Among Figure 16, on the inwall of the inside spin annular groove 17 of the intersecting pile body center hole 1 at square pile body 7 one ends arranged in a crossed manner.
Among Figure 17, on the inwall of the pile body center hole 1 of square pile body 7 one ends, be provided with some pits 18.
Among Figure 18, on the inwall of the pile body center hole 1 of square pile body 7 one ends, be provided with some projections 19.
The cutting working method of tapped prestressed reinforced concrete square hollow stake, square pile body 7 is by existing conventional method processing, after square pile body 7 is through the centrifuge processing and forming, enter the processing of carrying out the internal thread of square pile body 7 before the concrete initial set, comprising the steps: that square pile body 7 is driven by centrifuge does gyration, the square relatively pile body 7 of processing knife bar does axially and radial motion enters processing stations, adjust allowance, the processing knife bar is done the axial feed cutting along square pile body 7, after the processing knife bar is finished cutting, the processing knife bar is radially withdrawing from along square pile body 7 earlier, along axially the withdrawing from of square pile body 7, the concrete chip that cutting produces enters debris collection device and reclaims again.
The extrusion modling processing method of the prestressed reinforced concrete square hollow stake of band inner groove, square pile body 7 is by existing conventional method processing, after square pile body 7 is through the centrifuge processing and forming, enter the processing of carrying out the inner groove 12 of square pile body 7 before the concrete initial set, comprising the steps: that square pile body 7 is driven by centrifuge does gyration, installed that the square relatively pile body 7 of processing knife bar that some moulding roll is done axially and radial motion enters processing stations, according to allowance, the processing knife bar is made radial feed along square pile body 7, the inner surface that aligns the center hole of square pile body 7 carries out squeeze job, after the processing knife bar is finished squeeze job, processing knife bar elder generation radially withdraws from along square pile body 7, again axially withdrawing from along square pile body 7.
Claims (12)
1. prestressed reinforced concrete rectangular hollow pile, comprise rectangular pile body and rectangular metal end plate, rectangular pile body contains reinforcing cage, concrete, the center hole that a perforation is axially arranged of rectangular pile body, the rectangular metal end plate is arranged on the two ends of rectangular pile body, corresponding with the center hole on the rectangular pile body, also be provided with center hole on the rectangular metal end plate; It is characterized in that on the inwall of center hole of rectangular pile body female thread structure or inner trough structure or detent projection thing or some pits or some projections being arranged.
2. prestressed reinforced concrete rectangular hollow pile according to claim 1, the tooth depth that it is characterized in that internal thread is the 10-30 millimeter.
3. prestressed reinforced concrete rectangular hollow pile according to claim 1, the cross section that it is characterized in that rectangular pile body is a square or rectangular, its four angles be shaped as four equal circular arcs, or four right angles that equate, or circular arc mixes setting with the right angle, or orthodrome mixes setting with the roundlet arc.
4. according to claim 1 or 3 described prestressed reinforced concrete rectangular hollow piles, it is characterized in that inner trough structure is some inner groove structures of separate setting, or be the inside spin groove structure.
5. prestressed reinforced concrete rectangular hollow pile according to claim 4, the degree of depth that it is characterized in that the cell body of inside groove or inside spin annular groove is the 10-30 millimeter.
6. prestressed reinforced concrete rectangular hollow pile according to claim 5 is characterized in that inner groove is set to be parallel to each other, or intersects mutually.
7. prestressed reinforced concrete rectangular hollow pile according to claim 6 is characterized in that the angle between the center line of the symmetrical section of inner groove and the center hole on the rectangular pile body is 20--90 °.
8. prestressed reinforced concrete rectangular hollow pile according to claim 4, the shape of cross section that it is characterized in that inner groove are rectangle or trapezoidal or triangle or circular arc or the trough rim that is made of inner groove some straight lines, camber line line segment.
9. prestressed reinforced concrete rectangular hollow pile according to claim 8 is characterized in that the angle between the dual-side of cross section of trapezoidal inner groove is 5--120 °.
10. prestressed reinforced concrete rectangular hollow pile according to claim 9 is characterized in that the last base and the ratio of the length between the bottom of the cross section of trapezoidal inner groove is 0.1-0.99.
11. the cutting working method of prestressed reinforced concrete rectangular hollow pile according to claim 1, rectangular pile body is by existing conventional method processing, it is characterized in that after rectangular pile body is through the centrifuge processing and forming, carry out the internal thread of rectangular pile body or the processing of inner trough structure before entering concrete initial set, comprising the steps: that rectangular pile body is driven by centrifuge does gyration, the relative rectangular pile body of processing knife bar does axially and radial motion enters processing stations, adjust allowance, the processing knife bar is done the axial feed cutting along rectangular pile body, after the processing knife bar is finished cutting, the processing knife bar is radially withdrawing from along rectangular pile body earlier, along axially the withdrawing from of rectangular pile body, the concrete chip that cutting produces enters debris collection device and reclaims again.
12. the extrusion modling processing method of prestressed reinforced concrete rectangular hollow pile according to claim 1, rectangular pile body is by existing conventional method processing, it is characterized in that after rectangular pile body is through the centrifuge processing and forming, carry out the internal thread of rectangular pile body or the processing of inner trough structure before entering concrete initial set, comprising the steps: that rectangular pile body is driven by centrifuge does gyration, installed that the relative rectangular pile body of processing knife bar that some moulding roll is done axially and radial motion enters processing stations, according to allowance, the processing knife bar is made radial feed along rectangular pile body, inner surface to the center hole of rectangular pile body carries out squeeze job, after the processing knife bar is finished squeeze job, processing knife bar elder generation radially withdraws from along rectangular pile body, again axially withdrawing from along rectangular pile body.
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| CN201010170582XA CN101818498B (en) | 2010-05-13 | 2010-05-13 | Prestressed reinforced concrete rectangular hollow pile with internal meshing structure and processing method thereof |
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| CN102720206A (en) * | 2012-07-16 | 2012-10-10 | 南京工业大学 | Novel connecting structure of prestressed concrete pile and cushion cap |
| CN105855638B (en) * | 2016-06-12 | 2018-12-14 | 盐城市双强管桩有限公司 | Hollow pile inner ring grooving apparatus and processing method |
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| JP4005871B2 (en) * | 2002-08-05 | 2007-11-14 | 保宏 藤田 | Friction anchor pile and its placing method |
| CN2611433Y (en) * | 2002-11-20 | 2004-04-14 | 蒋元海 | Prestressed concrete shape tublar pile by pre-expanding process |
| CN100591855C (en) * | 2009-05-15 | 2010-02-24 | 凌德祥 | Prestressed concrete hollow square pile and its forming mould |
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Inventor after: Jiu Hailin Inventor after: Ling Dexiang Inventor after: Fei Hongliang Inventor after: Huang Guanglong Inventor before: Ling Dexiang Inventor before: Jiu Hailin Inventor before: Fei Hongliang Inventor before: Huang Guanglong |
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Free format text: CORRECT: INVENTOR; FROM: LING DEXIANG MIAO HAILIN FEI HONGLIANG HUANG GUANGLONG TO: MIAO HAILIN LING DEXIANG FEI HONGLIANG HUANG GUANGLONG |