CN113062308A - Method for improving single pile bearing capacity of open prestress high-strength concrete pipe pile - Google Patents
Method for improving single pile bearing capacity of open prestress high-strength concrete pipe pile Download PDFInfo
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- CN113062308A CN113062308A CN202110330980.1A CN202110330980A CN113062308A CN 113062308 A CN113062308 A CN 113062308A CN 202110330980 A CN202110330980 A CN 202110330980A CN 113062308 A CN113062308 A CN 113062308A
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 102
- 239000010959 steel Substances 0.000 claims abstract description 102
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 description 6
- 239000004567 concrete Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000002789 length control Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
Abstract
The invention belongs to the technical field of foundation engineering, and relates to a device and a method for improving the bearing capacity of a single open prestressed high-strength concrete pipe pile, wherein a pointed bottom cross-shaped pile tip is welded with an annular steel plate to ensure that a PHC pipe pile is open and sunk, so that a sandy soil layer and a strong-medium weathering rock layer can be conveniently penetrated, the contact area between the pile end and a bearing layer is increased through the tight connection between the enlarged annular steel plate and the pile end, and the pile end bearing capacity of the PHC pipe pile in a service state is improved; the special pile tip system realizes rapid pile sinking, ensures the bearing capacity of a single pile, solves the problem of difficulty in construction of the precast pile in a hard soil layer, can optimize the design of a pile foundation, achieves the aim of reducing the construction cost, and has remarkable economic benefit.
Description
The technical field is as follows:
the invention belongs to the technical field of foundation engineering, and relates to a method for improving the bearing capacity of a single open prestressed high-strength concrete pipe pile, which is suitable for any stratum except hard rock, can effectively reduce the pile side friction and the pile end resistance during pile sinking, is favorable for pile sinking, and can obviously improve the bearing capacity of the single pile during service.
Background art:
with the acceleration of the urbanization process in China, the demand of infrastructure construction increases year by year, and under the background, a Prestressed High Strength Concrete Pipe Pile (PHC Pipe Pile for short) has the advantages of High Pile forming efficiency, flexible Pile length control, High vertical bearing capacity, economic manufacturing cost, wide application range and the like, and is favored in the engineering fields of civil engineering, municipal administration, bridges and tunnels, ports and the like.
The PHC tubular pile is a hollow reinforced concrete tubular pile formed by high-temperature high-pressure steam curing by adopting a process of firstly tensioning and prestressing steel bars and carrying out high-speed centrifugal forming on a pile body. Compared with a closed PHC tubular pile, the open PHC tubular pile has the advantages of small required pile pressing force, high pile sinking speed and no influence on the long-term bearing capacity of the pile foundation. In the process of piling or pile pressing, in order to reduce the probability of pile breakage and improve the capability of penetrating through a soil layer, particularly a bearing layer, the pile tip is welded at the pile end. Currently, the common pile tip forms are: (1) the reinforced concrete pile tip and the precast concrete pipe pile are poured simultaneously, the connection between the pile tip and the pile body is good, but the pile tip is easy to vibrate and not compact during manufacturing, so that the quality of the pile tip is influenced; (2) the pile tip cross wing plate is rectangular, so that the manufacturing is simple, the pile sinking resistance is reduced to a certain extent, and the pile sinking speed is accelerated; but because the stress area is larger, the pile sinking efficiency is not as good as that of the trapezoidal wing plate; (3) the steel circular cone stake point can lead to stress too concentrated, easily leads to the stake point to warp at the pile sinking in-process, is difficult to guarantee stake point quality, and traditional stake point is done the back cover and is handled, when meetting specific soil layer like dense sand, well dense sand soil layer, because crowded soil effect is outstanding, pile sinking resistance is obviously higher than opening tubular pile sinking resistance, is difficult to pierce through the soil layer harder relatively.
In view of the above, how to ensure the bearing capacity of the pile foundation and improve the construction efficiency and solve the problem of difficult pile sinking in the hard soil layer; on the other hand, the problems of resource waste caused by overlong pile length and overlarge diameter, which are key technical problems in the existing pile foundation design, are also avoided. Therefore, a method which is fast in construction and capable of effectively improving the single pile bearing capacity of the PHC tubular pile is urgently needed to be designed.
The invention content is as follows:
the invention aims to overcome the design defects of the existing pile tip back cover treatment, and provides a method for improving the single pile bearing capacity of an open prestressed high-strength concrete pipe pile, which solves the problem that a precast pile is difficult to construct in a hard soil layer while ensuring the single pile bearing capacity.
In order to achieve the purpose, the device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile is used for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile, and the concrete process comprises the following steps:
measuring the inner diameter of a steel end plate and the position of an end plate bolt hole;
determining the bearing capacity characteristic value of the single open PHC pipe pile;
thirdly, determining physical and mechanical parameters of a rock-soil layer at the position of the pile foundation by combining the survey report;
determining the size (outer diameter and thickness) of an annular steel plate according to the bearing capacity characteristic value of the single open PHC pipe pile and physical and mechanical parameters of a soil layer, and determining the inner diameter of the annular steel plate and the positions of bolt holes of the annular steel plate according to the inner diameter of the steel end plate measured in the step one and the positions of the bolt holes of the end plate;
determining the outer diameter of an annular steel plate according to the outer diameter of the open PHC tubular pile, and then determining the outer dimensions of the long wing plate, the first short wing plate and the second short wing plate, wherein the length of the upper bottom edge (the welding side of the long wing plate and the annular steel plate) of the long wing plate is 1-2 cm smaller than the outer diameter of the annular steel plate, the length of the lower bottom edge is 10cm, the height of the lower bottom edge is 15-20 cm and the thickness of the long wing plate is 3cm, the first short wing plate and the second short wing plate are the same in size, the material, the height and the thickness of the first short wing plate are equal to the material, the height and the thickness of the long wing plate, the length of the upper bottom edge (the welding side of the annular steel plate) is the difference value obtained by subtracting the thickness of the long;
step six, prefabricating an annular steel plate, a long wing plate, a first short wing plate and a second short wing plate;
step seven, vertically welding the first short wing plate and the second short wing plate on two sides of the centroid position of the long wing plate to form a cross pile tip, ensuring that the two short wing plates are as high as the long wing plate, welding the cross pile tip on the annular steel plate to form an expanded pile tip system, and ensuring that the centroid of the cross pile tip and the centroid of the annular steel plate are positioned on the same vertical line during welding;
and step eight, aligning bolt holes in the enlarged pile tip system with bolt holes in end plates, screwing the bolt holes with high-strength bolts, then screwing the fixing nuts, and hammering the pile on the sandy soil layer by 20-40 strokes per meter to realize rapid pile sinking and improve the bearing capacity of a single pile.
The main structure of the device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile comprises an open PHC pipe pile, an annular steel plate bolt hole, a high-strength bolt, a fastening nut, a steel end plate, an end plate bolt hole and a cross pile tip; the center position of the cross pile tip is aligned with the circle center of the annular steel plate, and the part of the cross pile tip, which is overlapped with the annular steel plate, is welded by a fillet weld to form an enlarged pile tip system; the end part of the open PHC tubular pile is provided with a steel end plate, the inner diameter and the outer diameter of the steel end plate are the same as the size of the open PHC tubular pile, an end plate bolt hole is arranged on the steel end plate, a through hole is formed by the end plate bolt hole and an annular steel plate bolt hole, and the enlarged pile tip system and the open PHC tubular pile are mechanically connected with a fastening nut through a high-strength bolt; the cross pile tip is formed by welding a long wing plate, a first short wing plate and a second short wing plate through an angle weld, and the first short wing plate and the second short wing plate are welded on two sides of the center of the long wing plate and are flush with the long wing plate in height.
The long wing plate is made of a steel plate with an equilateral trapezoid structure, the length of an upper bottom edge (the welding side of the upper bottom edge and the annular steel plate) is 1-2 cm smaller than the outer diameter of the annular steel plate, the length of a lower bottom edge is 10cm, the height of the lower bottom edge is 15-20 cm, and the thickness of the lower bottom edge is 3cm, the first short wing plate and the second short wing plate are of right-angled trapezoid structures with the same size, the material, the height and the thickness of the first short wing plate and the second short wing plate are the same as those of the long wing plate, the length of the upper bottom edge (the welding side of the upper bottom edge and the annular steel plate) of the first short wing plate and the second short wing plate is half of the difference between the length of the.
The specification of the high-strength bolt is M12 multiplied by 80, and the specification of the fastening nut is matched with that of the high-strength bolt.
The outer diameter of the annular steel plate is 5-8 cm larger than that of the open PHC tubular pile, the annular steel plate is possibly subjected to flexural deformation due to the fact that the soil body generates vertical upward resistance to the annular steel plate in the pile sinking process, the specific size of the annular steel plate is calculated by a cantilever beam design theory, the inner diameter of the annular steel plate is the same as that of the open PHC tubular pile, and the thickness of the annular steel plate is 40 mm.
The concrete process for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile comprises the following steps:
measuring the inner diameter of a steel end plate and the position of an end plate bolt hole;
determining the bearing capacity characteristic value of the single open PHC pipe pile;
thirdly, determining physical and mechanical parameters of a rock-soil layer at the position of the pile foundation by combining the survey report;
determining the size (outer diameter and thickness) of an annular steel plate according to the bearing capacity characteristic value of the single open PHC pipe pile and physical and mechanical parameters of a soil layer, and determining the inner diameter of the annular steel plate and the positions of bolt holes of the annular steel plate according to the inner diameter of the steel end plate measured in the step one and the positions of the bolt holes of the end plate;
determining the outer diameter of an annular steel plate according to the outer diameter of the open PHC tubular pile, and then determining the outer dimensions of the long wing plate, the first short wing plate and the second short wing plate, wherein the length of the upper bottom edge (the welding side of the long wing plate and the annular steel plate) of the long wing plate is 1-2 cm smaller than the outer diameter of the annular steel plate, the length of the lower bottom edge is 10cm, the height of the lower bottom edge is 15-20 cm and the thickness of the long wing plate is 3cm, the first short wing plate and the second short wing plate are the same in size, the material, the height and the thickness of the first short wing plate are equal to the material, the height and the thickness of the long wing plate, the length of the upper bottom edge (the welding side of the annular steel plate) is the difference value obtained by subtracting the thickness of the long;
step six, prefabricating an annular steel plate, a long wing plate, a first short wing plate and a second short wing plate;
step seven, vertically welding the first short wing plate and the second short wing plate on two sides of the centroid position of the long wing plate to form a cross pile tip, ensuring that the two short wing plates are as high as the long wing plate, welding the cross pile tip on the annular steel plate to form an expanded pile tip system, and ensuring that the centroid of the cross pile tip and the centroid of the annular steel plate are positioned on the same vertical line during welding;
and step eight, aligning bolt holes in the enlarged pile tip system with bolt holes in end plates, screwing the bolt holes with high-strength bolts, then screwing the fixing nuts, and hammering the pile on the sandy soil layer by 20-40 strokes per meter to realize rapid pile sinking and improve the bearing capacity of a single pile.
Compared with the prior art, the invention adopts the welding of the pointed-bottom cross-shaped pile tip and the annular pile joint to ensure that the PHC pipe pile is sunk at the opening, so as to conveniently penetrate through a sand layer and a strong-medium fluidized rock stratum, and the contact area between the pile end and a bearing layer is increased by tightly connecting the enlarged annular steel plate and the pile end, thereby improving the pile end bearing force of the PHC pipe pile in a service state; the special pile tip system realizes rapid pile sinking, ensures the bearing capacity of a single pile, solves the problem of difficulty in construction of the precast pile in a hard soil layer, can optimize the pile foundation (shorten the pile length), achieves the aim of reducing the construction cost, and has remarkable economic benefit.
Description of the drawings:
fig. 1 is a front view of the structure of the device for improving the bearing capacity of a single open prestressed high-strength concrete pipe pile.
Fig. 2 is a top view of the open PHC pile of the present invention.
Fig. 3 is a front view of the enlarged toe system of the present invention.
Fig. 4 is a top view of an enlarged toe system of the present invention.
Fig. 5 is a top view of an annular steel plate of the enlarged toe system of the present invention.
Fig. 6 is a front view of a cross-shaped stake point of the enlarged stake point system of the present invention.
Fig. 7 is a top view of a cross-shaped stake point of the enlarged stake point system of the present invention.
Fig. 8 is a structural view of a long wing plate of the cross pile tip of the invention.
Fig. 9 is a view showing the construction of the first short wing plate (a) and the second short wing plate (b) of the cross pile tip according to the present invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example (b):
this embodiment adopts in certain engineering pile length 13m, pile diameter 500mm, wall thickness 150 mm's uncovered prestressing force high strength concrete tubular pile, geological conditions is miscellaneous fill-up 3m from top to bottom, clay 5m, sandy soil 3m, dense sand 5m, it buries into soil to use hammering method, close mouthful cross stake point with the tradition, when the circular cone stake point, in the sand soil layer per meter hammering number up to 40 ~ 60 hits, and do not have the influence to the pile foundation bearing capacity, adopt and improve behind the device of uncovered prestressing force high strength concrete tubular pile single pile bearing capacity, 20 ~ 40 hits at sand soil layer per meter hammering number, nearly 50% has been reduced, and single pile bearing capacity improves, concrete process is:
measuring the inner diameter of a steel end plate 9 and the position of an end plate bolt hole 10;
determining the bearing capacity characteristic value of a single open PHC tubular pile 1;
thirdly, determining physical and mechanical parameters of a rock-soil layer at the position of the pile foundation by combining the survey report;
determining the size (outer diameter and thickness) of the annular steel plate 2 according to the bearing capacity characteristic value of the single open PHC pipe pile 1 and physical and mechanical parameters of the soil layer, and determining the inner diameter of the annular steel plate 2 and the positions of the annular steel plate bolt holes 6 according to the inner diameter of the steel end plate 9 and the positions of the end plate bolt holes 10 measured in the step one;
determining the outer diameter of an annular steel plate 2 according to the outer diameter of an open PHC tubular pile 1, and then determining the outer dimensions of a long wing plate 3, a first short wing plate 4 and a second short wing plate 5, wherein the length of the upper bottom edge (the welding side of the long wing plate 3 and the annular steel plate) of the long wing plate 3 is 1-2 cm smaller than the outer diameter of the annular steel plate 2, the length of the lower bottom edge is 10cm, the height of the lower bottom edge is 15-20 cm and the thickness of the annular steel plate is 3cm, the first short wing plate 4 and the second short wing plate 5 have the same size, the material, the height and the thickness of the first short wing plate are equal to the material, the height and the thickness of the long wing plate 3, the length of the upper bottom edge (the welding side of the annular steel plate) is the difference of the length of the upper bottom edge of the long wing plate;
step six, prefabricating an annular steel plate 2, a long wing plate 3, a first short wing plate 4 and a second short wing plate 5;
step seven, vertically welding the first short wing plate 4 and the second short wing plate 5 on two sides of the centroid position of the long wing plate 3 to form a cross pile tip 12, ensuring that the two short wing plates 4 and 5 are equal in height with the long wing plate 3, welding the cross pile tip 12 on the annular steel plate 2 to form an expanded pile tip system 11, and ensuring that the centroid of the cross pile tip 12 and the centroid of the annular steel plate 2 are located on the same vertical line during welding;
and step eight, aligning bolt holes in the enlarged pile tip system 11 with bolt holes 10 of end plates, screwing up the bolt holes by using high-strength bolts 7, screwing up fixing nuts 8, hammering the pile on a sandy soil layer by 20-40 strokes per meter, realizing rapid pile sinking and improving the bearing capacity of a single pile.
The device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile mainly comprises an open PHC pipe pile 1, an annular steel plate 2, an annular steel plate bolt hole 6, a high-strength bolt 7, a fastening nut 8, a steel end plate 9, an end plate bolt hole 10 and a cross pile tip 12; the center position of the cross pile tip 12 is aligned with the circle center of the annular steel plate 2, and the part of the cross pile tip 12, which is overlapped with the annular steel plate 2, is welded by a fillet weld to form an expanded pile tip system 11; the end part of the open PHC tubular pile 1 is provided with a steel end plate 9, an end plate bolt hole 10 is arranged on the steel end plate 9, the end plate bolt hole 10 and the annular steel plate bolt hole 6 form a through hole, and the enlarged pile tip system 11 and the open PHC tubular pile 1 are mechanically connected with a fastening nut 8 through a high-strength bolt 7; the cross pile tip 12 is formed by welding the long wing plate 3, the first short wing plate 4 and the second short wing plate 5 through fillet welding, and the first short wing plate 4 and the second short wing plate 5 are welded on two sides of the center of the long wing plate 3 and are flush with the long wing plate 3 in height.
This embodiment long pterygoid lamina 3 adopts the steel sheet of equilateral trapezoid structure to make, it is 1 ~ 2cm less than annular steel sheet 2 external diameters to go up base (with annular steel sheet welding side) length, the base is long 10cm down, high 15 ~ 20cm, thick 3cm, first short pterygoid lamina 4 and the short pterygoid lamina 5 of second are the right angle trapezoid structure that the size is the same, its material, height and thickness and the material of long pterygoid lamina 3, height and thickness are the same, the last base (with annular steel sheet welding side) length of first short pterygoid lamina 4 and the short pterygoid lamina 5 of second is the half of base length and the 3 thickness difference value of long pterygoid lamina on the long pterygoid lamina 3, base length is the half of base length and 3 thickness difference values of long pterygoid lamina under the long pteryg.
The specification of the high-strength bolt 7 in this embodiment is M12 × 80, and the fastening nut 8 matches the specification of the high-strength bolt 7.
In the embodiment, the outer diameter of the annular steel plate 2 is 5-8 cm larger than that of the open PHC tubular pile 1, the vertical upward resistance of the soil body to the annular steel plate 2 is considered in the pile sinking process, the annular steel plate may be caused to generate flexural deformation, the specific size of the annular steel plate is obtained by calculation of a cantilever beam design theory, the inner diameter of the annular steel plate 2 is the same as that of the open PHC tubular pile 1, and the thickness of the annular steel plate is 40 mm.
Claims (5)
1. The method for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile is characterized by being realized in a device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile, and the specific process is as follows:
measuring the inner diameter of a steel end plate and the position of an end plate bolt hole;
determining the bearing capacity characteristic value of the single open PHC pipe pile;
thirdly, determining the physical and mechanical parameters of the rock-soil layer at the position of the pile foundation by combining the field survey report;
determining the outer diameter and the thickness of an annular steel plate according to the bearing capacity characteristic value of the single open PHC pipe pile and physical and mechanical parameters of a soil layer, and determining the inner diameter of the annular steel plate and the positions of bolt holes of the annular steel plate according to the inner diameter of the steel end plate and the positions of the bolt holes of the end plate measured in the step one;
determining the outer diameter of the annular steel plate according to the outer diameter of the open PHC pipe pile, and determining the external dimensions of the long wing plate, the first short wing plate and the second short wing plate;
step six, prefabricating an annular steel plate, a long wing plate, a first short wing plate and a second short wing plate;
step seven, vertically welding the first short wing plate and the second short wing plate on two sides of the centroid position of the long wing plate to form a cross pile tip, ensuring that the two short wing plates are as high as the long wing plate, welding the cross pile tip on the annular steel plate to form an expanded pile tip system, and ensuring that the centroid of the cross pile tip and the centroid of the annular steel plate are positioned on the same vertical line during welding;
and step eight, aligning bolt holes in the enlarged pile tip system with bolt holes in end plates, screwing the bolt holes with high-strength bolts, then screwing the fixing nuts, and hammering the pile on the sandy soil layer by 20-40 strokes per meter to realize rapid pile sinking and improve the bearing capacity of a single pile.
2. The method for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile according to claim 1, wherein the main structure of the device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile comprises an open PHC pipe pile, an annular steel plate bolt hole, a high-strength bolt, a fastening nut, a steel end plate, an end plate bolt hole and a cross pile tip; the center position of the cross pile tip is aligned with the circle center of the annular steel plate, and the part of the cross pile tip, which is overlapped with the annular steel plate, is welded by a fillet weld to form an enlarged pile tip system; the end part of the open PHC tubular pile is provided with a steel end plate, the inner diameter and the outer diameter of the steel end plate are the same as the size of the open PHC tubular pile, an end plate bolt hole is arranged on the steel end plate, a through hole is formed by the end plate bolt hole and an annular steel plate bolt hole, and the enlarged pile tip system and the open PHC tubular pile are mechanically connected with a fastening nut through a high-strength bolt; the cross pile tip is formed by welding a long wing plate, a first short wing plate and a second short wing plate through an angle weld, and the first short wing plate and the second short wing plate are welded on two sides of the center of the long wing plate and are flush with the long wing plate in height.
3. The method for bearing the single pile of the high-open prestress high-strength concrete pipe pile according to claim 2, wherein the long wing plate is made of a steel plate with an equilateral trapezoid structure, the length of the upper base edge is 1-2 cm smaller than the outer diameter of the annular steel plate, the length of the lower base edge is 10cm, the height is 15-20 cm and the thickness is 3cm, the first short wing plate and the second short wing plate are of right-angled trapezoid structures with the same size, the material, the height and the thickness of the first short wing plate and the second short wing plate are the same as those of the long wing plate, the length of the upper base edge of the first short wing plate and the length of the second short wing plate is half of the difference between the length of the upper base edge of the long wing plate and the thickness of the long wing plate, and the length of.
4. The apparatus of claim 2, wherein the specification of the high-strength bolt is M12 x 80, and the fastening nut is matched with the specification of the high-strength bolt.
5. The device for improving the bearing capacity of the single open prestressed high-strength concrete pipe pile according to claim 2, wherein the outer diameter of the annular steel plate is 5-8 cm larger than the outer diameter of the open PHC pipe pile, the specific size of the annular steel plate is calculated by a cantilever beam design theory, the inner diameter of the annular steel plate is the same as that of the open PHC pipe pile, and the thickness of the annular steel plate is 40 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062307A (en) * | 2021-03-26 | 2021-07-02 | 青岛地质工程勘察院(青岛地质勘查开发局) | Device for improving bearing capacity of single open prestressed high-strength concrete pipe pile |
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| CN103485339A (en) * | 2013-10-15 | 2014-01-01 | 青岛理工大学 | Static pressure expanded foot prestress high strength concrete pipe pile |
| CN203977419U (en) * | 2014-07-15 | 2014-12-03 | 天津富嘉诚投资有限公司 | Cross steel pile top |
| CN205399418U (en) * | 2016-02-15 | 2016-07-27 | 中国能源建设集团江苏省电力设计院有限公司 | Sharp structure of stake that reinforcing PHC tubular pile pile sinking broke ground |
| CN206189399U (en) * | 2016-06-24 | 2017-05-24 | 金陵科技学院 | Steel zigzag stake point |
| CN113062307A (en) * | 2021-03-26 | 2021-07-02 | 青岛地质工程勘察院(青岛地质勘查开发局) | Device for improving bearing capacity of single open prestressed high-strength concrete pipe pile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062307A (en) * | 2021-03-26 | 2021-07-02 | 青岛地质工程勘察院(青岛地质勘查开发局) | Device for improving bearing capacity of single open prestressed high-strength concrete pipe pile |
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