CN110029668B - PHC pipe pile convenient for measuring post-construction pile length and testing method thereof - Google Patents
PHC pipe pile convenient for measuring post-construction pile length and testing method thereof Download PDFInfo
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- CN110029668B CN110029668B CN201910361438.5A CN201910361438A CN110029668B CN 110029668 B CN110029668 B CN 110029668B CN 201910361438 A CN201910361438 A CN 201910361438A CN 110029668 B CN110029668 B CN 110029668B
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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
- E02D5/58—Prestressed concrete piles
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Abstract
The invention discloses a PHC (prestressed high-strength concrete) tubular pile convenient for post-construction pile length determination and a testing method thereof, and relates to a tubular pile technology. The PHC tubular pile comprises insulating longitudinal bars, common longitudinal bars, stirrups, reinforcing ribs, C-shaped insulating bars, pile body concrete, end plates, pile tips, leads and a direct-current resistance measuring instrument; the upper part of the first section of the soil-entering tubular pile is sequentially connected with a plurality of sections of unit tubular piles to form a whole, and the direct current resistance measuring instrument is connected with and tests a resistance loop of the left insulating longitudinal rib, the C-shaped insulating steel bar and the right insulating longitudinal rib through a lead. The test method comprises the following steps: firstly, manufacturing a PHC tubular pile; constructing the PHC tubular pile; and thirdly, measuring the pile length of the PHC pipe pile. The invention tests the resistance of the longitudinal steel bar of the tubular pile by means of the physical and electrical principle, and indirectly obtains the penetration depth of the pile body; the design and test method of the tubular pile has unified standard and strong operability, and can meet the post-construction pile length measurement requirement of a tubular pile construction site.
Description
Technical Field
The invention relates to a tubular pile technology, in particular to a PHC tubular pile design convenient for post-construction pile length measurement and a test method thereof.
Background
The PHC tubular pile (high-strength prestressed tubular pile) has the advantages of high strength, good driving resistance, strong penetrating power, high construction mechanization degree, high construction speed, small influence on environment and the like, and is particularly suitable for engineering construction with short construction period and high environmental protection requirement. In addition, the PHC tubular pile has the advantages of industrial production, controllable quality, and fully guaranteed pile body bearing capacity, bending resistance and anti-pulling performance after pile sinking compared with pile types such as cast-in-place piles and the like. Therefore, the engineering application of the PHC pipe pile is rapidly developed and widely applied to the projects such as building construction, airports, docks, dams, roads and the like.
After the PHC tubular pile is constructed, due to the soil squeezing effect of the pile body, the wave impedance of the bottom of the tubular pile is similar to that of a soil body, the reflection of the pile bottom with small strain waveforms is not obvious, meanwhile, the reflection of the pile splicing welding node to stress waves is obvious, and the detection of the depth of the PHC tubular pile in the soil after construction is difficult.
Disclosure of Invention
The invention aims to solve the problem that the post-construction pile length of a PHC pipe is difficult to detect, and provides a PHC pipe pile convenient for post-construction pile length measurement and a testing method thereof by combining pipe pile design and construction, pile foundation detection and physical and electrical technologies, so that the post-construction pile length of the PHC pipe can be accurately obtained.
The purpose of the invention is realized by the following steps:
PHC tubular pile convenient for measuring post-construction pile length
The PHC tubular pile comprises insulating longitudinal bars, common longitudinal bars, stirrups, reinforcing ribs, C-shaped insulating bars, pile body concrete, end plates, pile tips, leads and a direct current resistance measuring instrument;
the position and connection relation is as follows:
each section of unit tubular pile comprises a reinforcement cage framework of the tubular pile formed by a left insulation longitudinal bar, a right insulation longitudinal bar, a common longitudinal bar, a stirrup and a reinforcing bar, a main body of the tubular pile is formed by filled pile body concrete, and end plates are arranged at the upper end part and the lower end part of the tubular pile; c-shaped insulating steel bars are additionally arranged at the bottom of the first section of soil-entering tubular pile reinforcement cage;
the bottom of the first section of the soil-entering pipe pile is connected with a pile tip;
the upper part of the first section of the soil-entering tubular pile is sequentially connected with a plurality of sections of unit tubular piles to form a whole, and the direct current resistance measuring instrument is connected with and tests a resistance loop of the left insulating longitudinal rib, the C-shaped insulating reinforcing steel bar and the right insulating longitudinal rib through a lead.
Second, testing method (method for short) of PHC tubular pile convenient for measuring post-construction pile length
The method comprises the following steps:
firstly, making PHC pipe pile
When the tubular pile reinforcement cage is manufactured, epoxy resin is uniformly coated on the surface of an insulating longitudinal bar, an insulating sleeve is arranged at the intersection of the insulating longitudinal bar, a hoop and a reinforcing rib to finish the manufacture of the insulating longitudinal bar, and a C-shaped insulating steel bar is additionally arranged at the bottom of a first-root soil-entering tubular pile on the basis;
the left and right insulating longitudinal bars of the pile body are symmetrically laid along the axis of the pile body, a groove is reserved at the exposed head of the pile end of each insulating longitudinal bar, and the filled pile body concrete forms a main body of the pipe pile;
construction of PHC tubular pile
Welding a pile tip at the pile bottom of the first buried pipe pile, and connecting the pile tip with an end plate at the pile bottom through a fully welded pile tip welding seam;
when pile splicing is carried out, firstly, welding the insulated longitudinal bars of the upper pile and the lower pile, then filling the grooves at the exposed ends of the insulated longitudinal bars with hot melt adhesive to ensure that the insulated longitudinal bars are insulated at the welding positions, and finally, firmly connecting the end plates of the upper pile and the lower pile through fully welded pile splicing welding seams;
length measurement of PHC pipe pile
After the construction of the tubular pile is finished, the insulating longitudinal bar and the C-shaped insulating steel bar at the bottom of the first tubular pile form a U-shaped communication circuit, the resistance value of the insulating steel bar of the pile body can be accurately measured by using a direct-current resistance measuring instrument and a lead, and the penetration depth of the tubular pile can be obtained through conversion according to the resistance of the insulating steel bar in unit length and the length of the C-shaped insulating steel bar.
The invention has the following advantages and positive effects:
testing the resistance of longitudinal steel bars of the tubular pile by means of a physical and electrical principle to indirectly obtain the depth of the pile body into the soil;
secondly, epoxy resin is uniformly coated on the surface of the insulated longitudinal bar, and an insulating sleeve is arranged at the junction of the insulated longitudinal bar, the stirrup and the reinforcing rib, so that the insulation reliability of the longitudinal bar is ensured;
c-shaped insulating steel bars are additionally arranged at the bottom of the first buried pipe pile, and two ends of the C-shaped insulating steel bars are respectively connected with the two longitudinal bars, so that the U-shaped electrical loop of the pile body insulating steel bars is ensured to be communicated;
fourthly, circular grooves are formed in the exposed positions of the pile ends of the insulating longitudinal ribs, so that hot melt adhesive filling insulation is conveniently carried out after the insulating longitudinal ribs are welded;
the design of the pipe pile and the test method have unified standards, the operability is strong, and the post-construction pile length measurement requirement of a pipe pile construction site can be met.
Drawings
Fig. 1 is a schematic structural view of a PHC pile;
fig. 2 is a structural schematic diagram of a reinforcement cage of the PHC pile;
FIG. 3 is a sectional view A-A of FIG. 2;
FIG. 4 is a schematic view of the post-construction shaft of the PHC pile;
FIG. 5 is a schematic view of the connection of C-shaped insulating steel bars in a PHC tubular pile at the bottom of a first pile;
fig. 6 is a detailed schematic diagram of the insulated longitudinal ribs at the end of the PHC pile;
fig. 7 is a schematic diagram of an insulated longitudinal rib welded joint in a PHC pile.
In the figure:
1-an insulating longitudinal bar, wherein,
1-an epoxy resin,
1-2-an insulating sleeve pipe,
1-3-a groove, wherein,
1-4-hot-melt adhesive,
1-5-insulating longitudinal bar welding seam;
2-common longitudinal steel bars;
3, hooping;
4, reinforcing ribs;
5-C type insulating steel bars;
6, pile body concrete;
7-a terminal plate, wherein the terminal plate is provided with a plurality of connecting holes,
7-1-pile extension welding;
8-the point of the pile,
8-1-pile tip weld;
9-a wire;
10-direct current resistance measuring instrument.
Detailed Description
The following detailed description is made with reference to the accompanying drawings and implementation flows:
PHC pipe pile
1. General of
As shown in fig. 1, the PHC tubular pile comprises an insulating longitudinal bar 1, a common longitudinal bar 2, a stirrup 3, a reinforcing bar 4, a C-shaped insulating bar 5, pile body concrete 6, an end plate 7, a pile tip 8, a lead 9 and a direct current resistance measuring instrument 10;
the position and connection relation is as follows:
each section of unit tubular pile comprises a left insulating longitudinal bar 1, a right insulating longitudinal bar 1, a common longitudinal bar 2, a stirrup 3 and a reinforcing bar 4 to form a reinforcement cage framework of the tubular pile, filled pile body concrete 6 forms a main body of the tubular pile, end plates 7 are arranged at the upper end and the lower end of the tubular pile, and a C-shaped insulating bar 5 is additionally arranged at the bottom of the reinforcement cage of the first section of soil-entering tubular pile;
the bottom of the first section of the soil-entering pipe pile is connected with a pile tip 8;
a plurality of sections of unit tubular piles are sequentially connected to the upper portion of the first section of the soil-entering tubular pile to form a whole, and a direct current resistance measuring instrument 10 is connected with and measures a resistance loop of the left insulating longitudinal rib 1, the C-shaped insulating reinforcing steel bar 5 and the right insulating longitudinal rib 1 through a lead 9.
2. Functional component
As shown in fig. 1, 2, 3, 4, 5, 6, 7:
1) insulating longitudinal rib 1
The insulating longitudinal bars 1 are hot-rolled ribbed steel bars, the diameter and the type of the insulating longitudinal bars are the same as those of common longitudinal steel bars 2, epoxy resin 1-1 is uniformly coated on the surfaces of the insulating longitudinal bars for insulation treatment, insulating sleeves 1-2 are installed at the junctions of the insulating longitudinal bars 3 and reinforcing ribs 4 to strengthen insulation protection, two insulating longitudinal bars 1 are arranged in each section of PHC tubular pile, the two insulating longitudinal bars 1 are symmetrically laid along the axis of the pile body, and circular grooves 1-3 are reserved at the exposed ends of the pile ends of the insulating longitudinal bars 1.
(1) Epoxy resin 1-1
The epoxy resin 1-1 is hot-melt bisphenol A epoxy resin, has the advantages of high bonding strength, small curing shrinkage rate, excellent electrical insulation and the like, and the epoxy resin 1-1 is uniformly coated on the surface of the insulated longitudinal rib 1.
(2) Insulating sleeve 1-2
The insulating sleeve 1-2 is a corrugated pipe or other insulating material sleeve with the inner diameter matched with the insulating longitudinal rib 1, and the insulating sleeve 1-2 is arranged at the intersection of the insulating longitudinal rib 1, the stirrup 3 and the reinforcing rib 4, so that the epoxy resin 1-1 coating on the surface of the insulating longitudinal rib 1 can be prevented from being damaged.
(3) Grooves 1-3
The grooves 1-3 are arranged at the exposed ends of the insulating longitudinal ribs 1 at the end parts of the tubular pile and are circular, the insulating longitudinal ribs 1 are arranged at the centers of the grooves 1-3, and hot melt adhesive 1-4 is filled in the grooves 1-3 to keep the insulating longitudinal ribs 1 insulated after the insulating longitudinal ribs 1 are welded during pile splicing.
(4) 1-4 parts of hot melt adhesive
The hot melt adhesive 1-4 is a high-viscosity hot melt adhesive, and is used for filling the grooves 1-3 and isolating the insulating longitudinal ribs 1 after the insulating longitudinal ribs 1 are welded, so that the insulating longitudinal ribs 1 are kept insulated at the welding positions.
(5) Insulating longitudinal rib welding seam 1-5
And the insulating longitudinal rib welding seams 1-5 are positioned between the insulating longitudinal ribs 1 of the upper pile and the lower pile and used for ensuring the communication of the insulating longitudinal ribs 1 between the piles, before the insulating longitudinal ribs 1 are welded, firstly removing the epoxy resin 1-1 on the end sections of the insulating longitudinal ribs 1, and then completing the welding construction of the insulating longitudinal rib welding seams 1-5 by adopting a submerged arc welding or gas shielded welding mode.
2) Common longitudinal steel bar 2
The common longitudinal steel bar 2 is hot-rolled ribbed steel bar, the diameter, the type and the quantity are determined by the design calculation of the pile body, and the common longitudinal steel bar 2 and the insulated longitudinal steel bar 1 form the main steel bar of the tubular pile steel reinforcement cage and are uniformly distributed along the longitudinal direction.
3) Stirrup 3
4) Reinforcing ribs 4
The strengthening rib 4 is plain steel muscle, and diameter, model and interval are calculated through the design and are confirmed, and strengthening rib 4 all welds firmly with the handing-over point department of ordinary longitudinal reinforcement 2, and strengthening rib 4 adopts the iron wire ligature in handing-over point department with insulating vertical reinforcement 1.
5) C-shaped insulating steel bar 5
The C-shaped insulating steel bar 5 is a hot-rolled ribbed steel bar and is only arranged at the bottom of the first section of the soil-entering pipe pile, the diameter and the model are the same as those of the insulating longitudinal bar 1 and the common longitudinal steel bar 2, epoxy resin 1-1 is uniformly coated on the surface of the C-shaped insulating steel bar 5, and two ends of the C-shaped insulating steel bar are welded with the end parts of the 2 insulating longitudinal bars 1.
6) Pile body concrete 6
The pile body concrete 6 is self-compacting concrete with certain fluidity, and the type and the strength of the pile body concrete 6 are determined according to design requirements.
7) End plate 7
The end plate 7 is a circular ring-shaped steel plate, the size of the end plate is matched with that of a tubular pile, the thickness and the steel specification meet the specification and the use requirement, prestress tensioning holes are reserved in the corresponding positions of the end parts of the common longitudinal steel bars 2 of the end plate 7, and holes with the same outer diameters as those of the grooves 1-3 are reserved in the corresponding positions of the end parts of the insulated longitudinal steel bars 1.
(1) Pile-connecting weld seam 7-1
The pile connecting welding seam 7-1 is welded in a full-length welding mode and is used for connecting end plates 7 of upper and lower piles, 3 welders perform welding in a direction forming an angle of 120 degrees, and the number of welding layers is not less than 3.
8) Pile tip 8
The pile tip 8 is a steel sharp-bottom cross-shaped pile tip, the pile tip 8 is welded at the bottom of the first section of tubular pile through a pile tip welding seam 8-1, the pile breaking probability can be reduced in the pile sinking process, and the penetration capacity of the tubular pile to a soil layer is improved.
(1) Pile tip weld joint 8-1
The pile tip welding line 8-1 is welded in a full welding mode, 3 welders perform welding in a direction forming an angle of 120 degrees, and the number of welding layers is not less than 3.
9) Conducting wire 9
And the lead 9 is used for communicating the insulating longitudinal rib 1 and the direct current resistance measuring instrument 10 after the pile sinking of the tubular pile is finished, and testing the resistance value of the U-shaped loop of the pile body.
10) Direct current resistance measuring instrument 10
The direct current resistance measuring instrument 10 is used for testing the resistance value of a U-shaped loop of the pile body after the pile sinking of the pipe pile.
3. Mechanism of operation
The PHC tubular pile comprises an insulating longitudinal bar 1, a common longitudinal bar 2, a stirrup 3, a reinforcing rib 4, a C-shaped insulating bar 5, pile body concrete 6, an end plate 7, a pile tip 8, an insulating longitudinal bar lead 9 and a direct current resistance measuring instrument 10. Epoxy resin 1-1 is sprayed on the surface of the insulated longitudinal bar 1; the insulating longitudinal bar 1 is provided with an insulating sleeve 1-2 at the intersection of the stirrup 3 and the reinforcing bar 4; the end part of the insulating longitudinal rib 1 is provided with a groove 1-3.
When the tubular pile is constructed, the first root enters the pile bottom of the soil tubular pile, and the pile tip 8 is welded through a pile tip welding seam 8-1; when pile splicing welding is carried out, firstly, insulating longitudinal ribs 1 of upper and lower piles are welded through insulating longitudinal rib welding seams 1-5, then hot melt adhesives 1-4 are adopted to fill grooves 1-3 at exposed positions of the insulating longitudinal ribs 1, so that the insulating longitudinal ribs 1 are kept insulated at welding positions, and finally, end plates 7 of the upper and lower piles are welded firmly through pile splicing welding seams 7-1 in a full welding mode; after the construction of the tubular pile is finished, the insulating longitudinal bar 1 and the C-shaped insulating steel bar 5 at the bottom of the first tubular pile form a U-shaped communication circuit, the resistance value of the insulating steel bar of the pile body can be accurately measured by using the direct current resistance measuring instrument 10, and the penetration depth of the tubular pile can be accurately measured according to the resistance of the insulating steel bar in unit length and by considering the length of the C-shaped insulating steel bar 5.
Claims (2)
1. The utility model provides a PHC tubular pile convenient to long survey of worker's back stake which characterized in that:
the device comprises insulating longitudinal bars (1), common longitudinal bars (2), stirrups (3), reinforcing ribs (4), C-shaped insulating bars (5), pile body concrete (6), end plates (7), pile tips (8), leads (9) and a direct current resistance measuring instrument (10);
the position and connection relation is as follows:
each section of unit tubular pile comprises a left insulating longitudinal bar (1), a right insulating longitudinal bar (1), a common longitudinal bar (2), a stirrup (3) and a reinforcing bar (4) to form a reinforcement cage framework of the tubular pile, filled pile body concrete (6) forms a main body of the tubular pile, end plates (7) are arranged at the upper end part and the lower end part of the tubular pile, and a C-shaped insulating bar (5) is additionally arranged at the bottom of the first section of the soil-entering tubular pile reinforcement cage;
the bottom of the first section of the soil-entering pipe pile is connected with a pile tip (8);
a plurality of sections of unit tubular piles are sequentially connected to the upper portion of the first section of the buried tubular pile to form a whole, and a direct current resistance measuring instrument (10) is connected with a resistance loop for testing the left insulating longitudinal rib (1), the C-shaped insulating steel bar (5) and the right insulating longitudinal rib (1) through a lead (9).
2. The PHC tubular pile testing method facilitating post-construction pile length determination according to claim 1, characterized by comprising the following steps:
firstly, making PHC pipe pile
When the tubular pile reinforcement cage is manufactured, epoxy resin (1-1) is uniformly coated on the surface of the insulated longitudinal bar (1), and an insulated sleeve (1-2) is arranged at the junction of the insulated longitudinal bar (1), the hoop (3) and the reinforcing rib (4) to finish the manufacture of the insulated longitudinal bar (1); on the basis of the first buried pipe pile, a C-shaped insulating steel bar (5) is additionally arranged at the bottom of the first buried pipe pile;
the left and right insulating longitudinal bars (1) of the pile body are symmetrically laid along the axis of the pile body, grooves (1-3) are reserved at the exposed positions of the pile ends of the insulating longitudinal bars (1), and filled pile body concrete (6) forms a main body of the pipe pile;
construction of PHC pipe pile
A pile tip (8) is welded at the bottom of the first embedded tubular pile, and the pile tip (8) is connected with an end plate (7) at the bottom of the pile through a fully welded pile tip welding seam (8-1);
when pile splicing welding is carried out, firstly, the insulating longitudinal bars (1) of upper and lower piles are welded, then hot melt adhesives (1-4) are adopted to fill the grooves (1-3) at the exposed positions of the insulating longitudinal bars (1), so that the insulating longitudinal bars (1) are kept insulated at the welding positions, and finally, end plates (7) of the upper and lower piles are firmly connected through fully-welded pile splicing welding seams (7-1);
length measurement of PHC pipe pile
After the construction of the tubular pile is finished, the insulating longitudinal bar (1) and the C-shaped insulating steel bar (5) at the bottom of the first tubular pile form a U-shaped communication circuit, the resistance values of the insulating longitudinal bar (1) and the C-shaped insulating steel bar (5) can be accurately measured by using a direct current resistance measuring instrument (10) and a lead (9), and the penetration depth of the tubular pile can be obtained through conversion according to the resistance values of the insulating longitudinal bar (1) and the C-shaped insulating steel bar (5) and by considering the length of the C-shaped insulating steel bar (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910361438.5A CN110029668B (en) | 2019-04-30 | 2019-04-30 | PHC pipe pile convenient for measuring post-construction pile length and testing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910361438.5A CN110029668B (en) | 2019-04-30 | 2019-04-30 | PHC pipe pile convenient for measuring post-construction pile length and testing method thereof |
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| CN110029668A CN110029668A (en) | 2019-07-19 |
| CN110029668B true CN110029668B (en) | 2022-07-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113763541B (en) * | 2021-09-14 | 2024-05-28 | 广联达科技股份有限公司 | Method and equipment for calculating longitudinal ribs in column and readable storage medium |
| CN115055858B (en) * | 2022-07-22 | 2023-04-28 | 广州市市政工程试验检测有限公司 | Automatic welding method and related device for prestressed pipe pile |
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| SU958585A1 (en) * | 1980-06-30 | 1982-09-15 | Государственный институт по проектированию оснований и фундаментов "Фундаментпроект" | Method of measuring the depth of penetration of pile into earth |
| US6718648B1 (en) * | 2002-01-11 | 2004-04-13 | Tony S. Knight | Method and apparatus for measuring a length of a pressed pile |
| CN1818234A (en) * | 2006-03-10 | 2006-08-16 | 南京大学 | Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method |
| CN104897321A (en) * | 2015-06-24 | 2015-09-09 | 潍坊学院 | Prefabricated opening concrete tubular pile body inner wall shearing strength testing device and method |
| CN108661090A (en) * | 2018-06-04 | 2018-10-16 | 中航勘察设计研究院有限公司 | A kind of silent prestressed concrete pipe pile stress test method |
| CN210086240U (en) * | 2019-04-30 | 2020-02-18 | 中国科学院武汉岩土力学研究所 | PHC tubular pile convenient to long survey of worker's back stake |
-
2019
- 2019-04-30 CN CN201910361438.5A patent/CN110029668B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU958585A1 (en) * | 1980-06-30 | 1982-09-15 | Государственный институт по проектированию оснований и фундаментов "Фундаментпроект" | Method of measuring the depth of penetration of pile into earth |
| US6718648B1 (en) * | 2002-01-11 | 2004-04-13 | Tony S. Knight | Method and apparatus for measuring a length of a pressed pile |
| CN1818234A (en) * | 2006-03-10 | 2006-08-16 | 南京大学 | Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method |
| CN104897321A (en) * | 2015-06-24 | 2015-09-09 | 潍坊学院 | Prefabricated opening concrete tubular pile body inner wall shearing strength testing device and method |
| CN108661090A (en) * | 2018-06-04 | 2018-10-16 | 中航勘察设计研究院有限公司 | A kind of silent prestressed concrete pipe pile stress test method |
| CN210086240U (en) * | 2019-04-30 | 2020-02-18 | 中国科学院武汉岩土力学研究所 | PHC tubular pile convenient to long survey of worker's back stake |
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