CN112012249A - PHC anchor pile head reinforcing method for static load test of pile foundation of offshore high pile wharf - Google Patents
PHC anchor pile head reinforcing method for static load test of pile foundation of offshore high pile wharf Download PDFInfo
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- CN112012249A CN112012249A CN202010821168.4A CN202010821168A CN112012249A CN 112012249 A CN112012249 A CN 112012249A CN 202010821168 A CN202010821168 A CN 202010821168A CN 112012249 A CN112012249 A CN 112012249A
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- pile
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- steel
- anchor
- hoop
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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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
- E02D5/22—Piles
- E02D5/60—Piles with protecting cases
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a PHC anchor pile head reinforcing method for a static load test of a pile foundation of an offshore high-pile wharf, which comprises the following steps of: before the test, the PHC anchor pile is subjected to pile head concrete cutting and chiseling, and is leveled by cement mortar; processing a steel ferrule, perforating a ferrule end plate, and fixing the ferrule end plate and the steel ferrule; and (3) enabling the opening of the end plate of the hoop to penetrate through a prestressed steel bar in the PHC anchor pile, placing the steel hoop on the pile head of the leveled PHC anchor pile, then anchoring by using an anchorage device and a clamping piece, and finally fixing the auxiliary beam and the steel hoop in a static load test. The method can effectively solve the problem of difficult anchoring of the large-diameter PHC anchor pile on the sea, effectively reduces the use of ship machines by doing a large amount of earlier-stage work on the land in advance compared with the traditional pile head reinforcing mode, saves manpower and reduces the input of pile head reinforcing materials.
Description
Technical Field
The invention relates to a PHC anchor pile head reinforcing method for a static load test of a pile foundation of an offshore high-pile wharf.
Background
The PHC anchor pile reinforcing method for the early pile foundation static load test is to place a reinforcement cage in a pile and pour concrete. And (3) wrapping the pile by using a steel plate with the thickness of 3-5 mm within 1 time of the pile diameter from the pile top or arranging stirrups within 1.5 times of the pile diameter from the pile top, wherein the distance is not more than 100 mm. The pile top is provided with 1-2 layers of reinforcing mesh sheets with the distance of 60-100 mm. The method is used for filling the piles in the land area, and is not suitable for reinforcing the large-diameter marine PHC pipe pile on the sea because the method cannot firmly connect equipment and anchor piles, has high field operation difficulty and cannot meet the requirements of a marine PHC pipe pile static load test.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a PHC anchor pile head reinforcing method for a static load test of a pile foundation of an offshore high-pile wharf.
In order to achieve the purpose, the method for reinforcing the PHC anchor pile head for the static load test of the offshore high-pile wharf pile foundation adopted by the invention comprises the following steps:
firstly, cutting and chiseling pile head concrete of a PHC anchor pile before testing, and leveling by using cement mortar;
step two, processing the steel ferrule, opening a hole in the ferrule end plate, and fixing the ferrule end plate and the steel ferrule;
and step three, enabling the opening of the end plate of the hoop to penetrate through a prestressed steel bar in the PHC anchor pile, placing the steel hoop on the pile head of the leveled PHC anchor pile, then using an anchorage device and a clamping piece for anchoring, and finally fixing the auxiliary beam and the steel hoop in the static load test.
In the first step, the height of the pile head concrete cutting and chiseling is at least 20 cm.
In the second step, the hoop end plate is welded at the bottom of the steel hoop, an elliptical hole is formed in the hoop end plate, and a rib plate is welded between the steel hoop and the hoop end plate.
Furthermore, a plurality of elliptical holes are uniformly arranged on the hoop end plate.
And in the third step, the prestressed steel bars are the overhanging reinforcing steel bars after the pile head of the PHC anchor pile is cut and chiseled.
And the static load test auxiliary beam and the steel ferrule are fixedly connected through a steel bar.
Compared with the prior art, the method for reinforcing the pile head of the PHC anchor pile can effectively solve the problem of difficult anchoring of the large-diameter PHC anchor pile on the sea, effectively reduces the use of a ship machine, saves manpower and reduces the input of pile head reinforcing materials by doing a large amount of earlier-stage work on the land in advance compared with the traditional pile head reinforcing mode. The method has the characteristics of simplicity, simplicity and convenience in operation, easiness in disassembly and assembly, reutilization, cost saving, environmental protection, reinforcement effect improvement and the like.
Drawings
Fig. 1 is a schematic view of the arrangement structure of PHC anchor piles in the present invention;
FIG. 2 is a schematic top view of a PHC anchor pile head according to the present invention;
FIG. 3 is a schematic view of the connection structure of the PHC anchor pile and the end of the hoop in the present invention;
in the figure: 1. PHC anchor pile 2, reference pile 3, test pile 4, prestressed steel bar 5, hoop end plate 6, ribbed plate 7 and steel hoop.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
A PHC anchor pile head reinforcing method for a static load test of an offshore high-pile wharf pile foundation comprises the following steps:
firstly, cutting and chiseling pile head concrete of the PHC anchor pile 1 before testing, and leveling by using cement mortar;
step two, processing the steel ferrule 7, opening a hole in the ferrule end plate 5, and fixing the ferrule end plate 5 and the steel ferrule 7;
and step three, enabling the opening of the hoop end plate 5 to penetrate through the prestressed steel bar 4 in the PHC anchor pile 1, placing the steel hoop 7 on the pile head of the leveled PHC anchor pile 1, then using an anchorage device and a clamping piece for anchoring, and finally fixing the auxiliary beam and the steel hoop 7 in the static load test.
In an improvement of the embodiment, in the first step, the cutting and chiseling height of the pile head concrete is at least 20 cm.
In the second step, the hoop end plate 5 is welded to the bottom of the steel hoop 7, an elliptical hole is formed in the hoop end plate 5, and a rib plate 6 is welded between the steel hoop 7 and the hoop end plate 5.
Furthermore, a plurality of elliptical holes are uniformly arranged on the hoop end plate 5.
Further, in the third step, the prestressed steel bars 4 are overhanging reinforcing steel bars after the pile head of the PHC anchor pile 1 is cut and chiseled.
Furthermore, the auxiliary beam for the static load test and the steel sleeve hoop are fixedly connected through a steel bar.
Example 1
A PHC anchor pile head reinforcing method for a static load test of an offshore high-pile wharf pile foundation comprises the following steps:
1) preparation for construction
a) Building a construction platform as shown in figure 1; the test pile comprises four PHC anchor piles 1, two reference piles 2 and two test piles 3, wherein the four PHC anchor piles 1 are symmetrically arranged at four corners, each reference pile 2 is arranged between the two PHC anchor piles 1, and one test pile 3 is arranged at the center of each of the four PHC anchor piles 1;
b) referring to fig. 2 and 3, a steel ferrule 7 and a ferrule end plate 5 are welded, the inner diameter of the steel ferrule 7 is 740mm, the width of a rib plate 6 is 130mm, double-sided full welding is adopted, the thickness of the ferrule end plate 5 is 5cm, and 32 elliptical holes with the long axis of 20mm and the short axis of 15 mm are uniformly distributed on the ferrule end plate 5;
c) the connection of the clamping plate and the steel bar adopts double-sided full welding, the diameter of the steel bar is 29mm, and the welding length is 20 cm;
d) chiseling the concrete of the four PHC anchor piles 1 before construction, chiseling the concrete to the height of 20cm, and leveling the tops of the anchor piles by using mortar;
2) steel ferrule installation
After the preparation work is finished, the steel sleeve hoop 7 is installed, so that the hoop end plate 5 can penetrate through the prestressed steel bar 4, the diameter of the prestressed steel bar 4 in the PHC anchor pile 1 in the design drawing is 12.6mm, the hoop end plate 5 is provided with an elliptical hole, the major axis of the elliptical hole is 20mm, the minor axis of the elliptical hole is 15 mm, the elliptical holes are uniformly distributed on the hoop end plate 5, and part of the steel sleeve hoop 7 which cannot descend to the height of the top surface of the anchor pile by means of the dead weight can press the steel sleeve hoop 7 downwards by using a heavy load;
3) after the steel sleeve hoop 7 is placed, an anchorage device and a clamping piece matched with the 12.6mm prestressed steel bar 4 are used for sealing;
4) after the static load equipment enters the field, hoisting the equipment;
5) after the equipment is installed, the auxiliary beam is connected with the steel ferrules 7 in a mode that each steel ferrule 7 is subjected to double-sided welding by adopting 16 steel bars with the diameter of 29mm, and the full-length welding is 30 cm;
6) after the welding is completed, the test can be carried out.
The pile head reinforcing method for the PHC anchor pile adopts the modes of the PHC anchor pile steel strand, the steel hoop, the anchorage device and the steel bar.
Before the test, cutting and chiseling the pile head concrete of the PHC anchor pile, chiseling the length of about 20cm, and leveling by using cement mortar; processing a steel hoop according to a design drawing of a PHC anchor pile manufacturer, uniformly perforating a hoop end plate, and performing double-sided full welding on the end plate and the hoop; during construction, the open holes in the hoop end plates need to be ensured to penetrate through prestressed steel bars in the PHC anchor piles, the steel hoops are placed on the pile heads of the leveled PHC anchor piles, then anchoring is carried out by using an anchorage device and clamping pieces, finally the auxiliary beam and the steel hoops are welded and connected through reinforcing steel bars in a static load test, and double-sided full welding is adopted.
The method for reinforcing the pile head of the PHC anchor pile can effectively solve the problem of difficult anchoring of the large-diameter PHC anchor pile on the sea, effectively reduces the use of a ship machine, saves manpower and reduces the input of pile head reinforcing materials by doing a large amount of early work on the land in advance compared with the traditional pile head reinforcing mode. The method has the characteristics of simplicity, simplicity and convenience in operation, easiness in disassembly and assembly, reutilization, cost saving, environmental protection, reinforcement effect improvement and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A PHC anchor pile head reinforcing method for a static load test of a pile foundation of a marine high pile wharf is characterized by comprising the following steps:
firstly, cutting and chiseling pile head concrete of a PHC anchor pile before testing, and leveling by using cement mortar;
step two, processing the steel ferrule, opening a hole in the ferrule end plate, and fixing the ferrule end plate and the steel ferrule;
and step three, enabling the opening of the end plate of the hoop to penetrate through a prestressed steel bar in the PHC anchor pile, placing the steel hoop on the pile head of the leveled PHC anchor pile, then using an anchorage device and a clamping piece for anchoring, and finally fixing the auxiliary beam and the steel hoop in the static load test.
2. The method for strengthening the pile head of the PHC anchor pile for the static load test of the pile foundation of the offshore high pile wharf according to claim 1, wherein in the first step, the cutting and chiseling height of the concrete of the pile head is at least 20 cm.
3. The method for reinforcing the pile head of the PHC anchor pile for the static load test of the offshore high-pile wharf pile foundation according to claim 1, wherein in the second step, the hoop end plate is welded to the bottom of the steel hoop, an elliptical hole is formed in the hoop end plate, and a rib plate is welded between the steel hoop and the hoop end plate.
4. The PHC anchor pile head reinforcing method for the static load test of the pile foundation on the high-piled wharf at the sea as claimed in claim 3, wherein the elliptical holes are provided in a plurality and are uniformly arranged on the hoop end plate.
5. The method for reinforcing the pile head of the PHC anchor pile for the static load test of the offshore high-pile wharf pile foundation according to claim 1, wherein in the third step, the prestressed steel bars are the overhanging steel bars after the pile head of the PHC anchor pile is cut and chiseled.
6. The method for reinforcing the pile head of the PHC anchor pile for the static load test of the offshore high-pile wharf pile foundation according to claim 1, wherein the auxiliary beam and the steel ferrule are fixedly connected through a steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821168.4A CN112012249A (en) | 2020-08-14 | 2020-08-14 | PHC anchor pile head reinforcing method for static load test of pile foundation of offshore high pile wharf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821168.4A CN112012249A (en) | 2020-08-14 | 2020-08-14 | PHC anchor pile head reinforcing method for static load test of pile foundation of offshore high pile wharf |
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| Publication Number | Publication Date |
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| CN112012249A true CN112012249A (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010821168.4A Pending CN112012249A (en) | 2020-08-14 | 2020-08-14 | PHC anchor pile head reinforcing method for static load test of pile foundation of offshore high pile wharf |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826305U (en) * | 2010-02-01 | 2011-05-11 | 宿迁市固丰管桩有限公司 | Prestressed concrete pipe pile end plate |
| CN204570756U (en) * | 2015-03-18 | 2015-08-19 | 安徽省建筑工程质量监督检测站 | Foundation pile static load test radial force transmission connections |
| CN107246034A (en) * | 2017-07-12 | 2017-10-13 | 安徽省建筑科学研究设计院 | Pile crown for pile bearing capacity static test stretches out reinforcing steel bar connecting device |
| CN206768884U (en) * | 2017-03-28 | 2017-12-19 | 中建八局第二建设有限公司 | A kind of static test counter-force anchorage |
| CN110700332A (en) * | 2019-09-29 | 2020-01-17 | 广东省建筑科学研究院集团股份有限公司 | Existing building reinforcing pile foundation static load test counterforce device and test method thereof |
| CN111424736A (en) * | 2020-05-08 | 2020-07-17 | 四川恒固建设工程检测有限公司 | Anchor pile cross beam counterforce device |
-
2020
- 2020-08-14 CN CN202010821168.4A patent/CN112012249A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826305U (en) * | 2010-02-01 | 2011-05-11 | 宿迁市固丰管桩有限公司 | Prestressed concrete pipe pile end plate |
| CN204570756U (en) * | 2015-03-18 | 2015-08-19 | 安徽省建筑工程质量监督检测站 | Foundation pile static load test radial force transmission connections |
| CN206768884U (en) * | 2017-03-28 | 2017-12-19 | 中建八局第二建设有限公司 | A kind of static test counter-force anchorage |
| CN107246034A (en) * | 2017-07-12 | 2017-10-13 | 安徽省建筑科学研究设计院 | Pile crown for pile bearing capacity static test stretches out reinforcing steel bar connecting device |
| CN110700332A (en) * | 2019-09-29 | 2020-01-17 | 广东省建筑科学研究院集团股份有限公司 | Existing building reinforcing pile foundation static load test counterforce device and test method thereof |
| CN111424736A (en) * | 2020-05-08 | 2020-07-17 | 四川恒固建设工程检测有限公司 | Anchor pile cross beam counterforce device |
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Application publication date: 20201201 |