Super-long pile hoop at pile top of prestressed high-strength concrete pipe pile

Abstract

The utility model relates to the technical field of concrete pipe pile prefabrication production, in particular to a pre-stressed high-strength concrete pipe pile top super-long pile hoop which comprises a pile hoop cylinder, a plurality of rows of round dents are arranged on the inner surface of the cylinder, and high nuts with magnetic attraction bases and nylon rings are fixed in the dents. The high nut is sleeved with the nut ceramic ring and is fixed through the ceramic ring fixer, and the high nut is connected with the round-head shear nail with the external thread to form a shear connector of the pile hoop. Through the simple combination of the pile hoop barrel, the high nuts and the shear nails, the process of firstly welding and then assembling of the super-long pile hoop and a shear-resistant connecting system can be realized, and the problem of the welding quality of the shear nails caused by narrow internal space of the super-long pile hoop barrel is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of precast production of concrete pipe piles, in particular to an extra-long pile sleeve hoop at the top of a prestressed high-strength concrete pipe pile. Background Art

[0002] Prestressed concrete pipe piles are typical building industrialization products, which have technical advantages such as fast construction speed, small environmental impact, and low cost per unit bearing capacity, and are widely used in highway engineering, bridge engineering, industrial and civil building engineering.

[0003] The hammering method is a common pile driving method for prestressed concrete pipe piles, and its construction principle is to use the impact energy of the pile hammer to drive the pipe pile to the designed depth.

[0004] The pile sleeve hoop arranged at the top of the pile can provide certain radial restraint for the concrete at the top of the pile, thereby reducing the impact effect of the pile hammer on the top of the pipe pile.

[0005] According to the national atlas "Prestressed Concrete Pipe Piles" 10G409, when the outer diameter of the pipe pile is 300mm - 1200mm, the designed height of the pile sleeve hoop generally ranges from 120mm to 300mm. For prestressed high-strength concrete pipe piles, this value-taking habit is also followed in engineering.

[0006] Compared with prestressed concrete pipe piles, prestressed high-strength concrete pipe piles with a concrete strength of more than C80 in the pile body have higher single-pile bearing capacity, stronger formation penetration ability, and a wider application range. However, they also need to withstand greater pile hammer impact. In the face of application scenarios with complex geological conditions, the existing designed height of the pile sleeve hoop provides very limited protection for the pile top. If the pile hammer impact is increased, the damage rate of the pipe pile will increase significantly.

[0007] The designed height of the extra-long pile sleeve hoop involved in the utility model exceeds 600mm, which can provide sufficient protection for the pile section with strong dynamic stress response at the pile top during drop hammer impact, improve the construction quality of the pipe pile, and reduce the explosion rate of the pile.

[0008] At present, in order to ensure the effective connection between the pile sleeve hoop and the pile top concrete, generally two methods are adopted in engineering: one is to press multiple indentations or protrusions in the pile sleeve hoop; the other is to weld shear studs in the pile sleeve hoop.

[0009] The first method has a simple process but provides insufficient shear connection force and is not suitable for the application scenario of an extra-long pile sleeve hoop; the second method has a stable connection, and the shear connection performance can be controlled and easily checked, and it is the preferred connection scheme for an extra-long pile sleeve hoop.

[0010] However, due to the narrow internal operation space of the extra-long pile sleeve hoop and the arc-shaped working surface, the traditional shear stud connection scheme is difficult to ensure the welding quality.

[0011] The utility model adopts a shear stud assembly process of welding first and then assembling. Through the design of a supporting ultra-long pile sleeve hoop and shear connectors, it effectively solves the welding quality problems caused by directly welding shear studs in the ultra-long pile sleeve hoop. The welding surface between the pile sleeve hoop and the shear connectors is neat and beautiful. The axial eccentricity error after the shear studs are assembled is small. The shear strength of the shear studs is not affected by the temperature stress during welding, and it has a self-locking function, so it is not easy to loosen during the subsequent centrifugal processing of pipe pile concrete. The shear stud assembly process is simple and smooth, and has a quick inspection function, which is easy for quality control, and has a significant effect on improving the construction quality of pipe piles by the hammering method and reducing the explosion rate of piles. Summary of the Invention

[0012] In order to reduce the construction damage to the concrete at the top of the prestressed high-strength concrete pipe pile by the hammering method, and the welding quality problems of the shear studs caused by the narrow welding space due to the increased design length of the pile sleeve hoop, the utility model proposes an ultra-long pile sleeve hoop at the top of the prestressed high-strength concrete pipe pile. First, select a suitable pile sleeve hoop plate according to the outer diameter of the pipe pile, select a supporting indentation die according to the magnetic base size of the high nut and the outer diameter of the pipe pile, determine the number, position and spacing of the indentations according to the designed reinforcement of the pipe pile. After preparation, press multiple rows of indentations on the base material of the pile sleeve hoop cylinder through an indentation machine. After curling, welding and rounding, the pile sleeve hoop cylinder is obtained. Put the nut porcelain ring into the high nut and then put it into the porcelain ring fixator and clamp it tightly. Temporarily magnetize it in the indentation through the magnetic base of the high nut. Manually adjust the high nut so that the centering protrusion in the indentation is completely fitted with the card slot in the magnetic base. After completion, carry out the welding operation between the nut and the cylinder. After the welding is completed, remove the porcelain ring fixator and the nut porcelain ring in turn. When the nut porcelain ring cannot be removed in special cases, the nut porcelain ring can be cut off from the triangular groove position of the nut porcelain ring. Complete the welding of all high nuts in turn according to the above steps. After the welding quality inspection, screw the round head shear stud with an external thread into the high nut, and ensure that the first fluorescent strip is completely immersed in the thread hole of the high nut. Complete the assembly work of all round head shear studs in turn according to the above steps, and observe the fluorescent strip of the round head shear stud to complete the visual inspection.

[0013] In order to achieve the above object, the technical solution of the utility model is: an ultra-long pile sleeve hoop at the top of a prestressed high-strength concrete pipe pile, including a pile sleeve hoop cylinder, a high nut, a nut porcelain ring, a porcelain ring fixator, and a round head shear stud.

[0014] Further, a top rib is provided at the top of the pile sleeve hoop cylinder to resist the local concentrated stress at the connection part between the pile sleeve hoop and the end plate during pile driving. A bell mouth is provided at the bottom of the pile sleeve hoop cylinder to prevent slurry leakage at the pile head during the centrifugal processing of the pipe pile. The pile sleeve hoop cylinder is provided with a plurality of indentations. When the pile sleeve hoop cylinder is unfolded into a plane, the projection of the indentation on the unfolded plane is circular. The indentations are arranged in rows, the indentations in the same row are arranged at equal intervals, and the indentations in adjacent rows are arranged in a staggered manner. The indentation is provided with a centering protrusion.

[0015] Further, the high nut is provided with a magnetic base, which is matched with the indentation. The magnetic base and the indentation are temporarily fixed by magnetic attraction and connected by a circular welding band after being adjusted in place. The magnetic base is provided with a card slot, which is matched with the size of the centering protrusion. The high nut is provided with an internal thread hole, which has a non-threaded section at the top and a nylon ring at the bottom.

[0016] Further, the nut porcelain ring is provided with a triangular groove. In special cases where the nut porcelain ring cannot be taken out, the nut porcelain ring can be cut off from the position of the triangular groove.

[0017] Further, the porcelain ring fixer is provided with a rubber washer for clamping the porcelain ring fixer.

[0018] Further, the round head shear stud is provided with an external threaded section, and the thread profile and size of the external threaded section are matched with the internal thread of the high nut. The round head shear stud should finally be screwed to the position of the nylon ring at the bottom of the internal thread hole of the high nut, and the nylon ring provides a self-locking force. The round head shear stud is provided with a first fluorescent strip and a second fluorescent strip, and the height of the first fluorescent strip is the same as the height of the non-threaded section at the top of the internal thread hole of the high nut, and it can be completely immersed in the high nut when tightened.

[0019] By the above technical solutions, the beneficial effects of the present utility model are as follows:

[0020] 1. Through the installation process of the shear stud with welding first and then assembly, the present utility model solves the welding quality problem of the shear stud of the ultra-long pile hoop caused by limited operation space, expands the construction difficulty and application range of the ultra-long pile hoop, and plays an important role in reducing the construction damage caused by the hammering method to the concrete at the top of the prestressed high-strength concrete pipe pile.

[0021] 2. By adsorbing the magnetic base of the high nut on the indentation of the pile hoop, the present utility model solves the fixation problem of the high nut before welding. The card slot provided on the magnetic base and the centering protrusion provided in the indentation of the pile hoop cylinder can ensure that the central axis of the high bolt points to the radial direction of the pile hoop cylinder, and the centering adjustment takes a short time, which is convenient for construction.

[0022] 3. By setting two fluorescent strips and leaving a space for accommodating the first fluorescent strip in the high bolt hole, the present utility model can quickly check the assembly quality of the round head shear stud. It is qualified to visually see one fluorescent strip, the assembly is not in place when two fluorescent strips are visually visible, and the shear stud is missing when no fluorescent strip is visually visible. After the round head shear stud is assembled in place, the nylon ring will provide a certain self-locking force to ensure that the shear stud will not loosen during the centrifugal construction of concrete.

[0023] 4. The utility model effectively reduces the influence of temperature stress on the high nut during welding construction by setting a nut porcelain ring. The annular welding belt is of reliable quality, neat and beautiful, and the welding construction is simple and convenient. Description of the Drawings

[0024] Figure 1 It is a partial sectional view of the ultra-long pile hoop and shear connector of the utility model;

[0025] Figure 2 It is a plane development view of the ultra-long pile hoop cylinder of the utility model;

[0026] Figure 3 It is a sectional view of the ultra-long pile hoop cylinder of the utility model;

[0027] Figure 4 It is a plan view of the indentation of the ultra-long pile hoop cylinder of the utility model;

[0028] Figure 5 It is a sectional view of the indentation of the ultra-long pile hoop cylinder of the utility model;

[0029] Figure 6 It is a sectional view of the high nut of the utility model;

[0030] Figure 7 It is a partially enlarged view of the nut magnetic ring of the utility model;

[0031] Figure 8 It is an elevation view of the round head shear stud of the utility model;

[0032] The reference numerals in the drawings are: 1 is the pile hoop cylinder, 2 is the high nut, 3 is the nut porcelain ring, 4 is the porcelain ring fixator, 5 is the round head shear stud, 6 is the top rib, 7 is the flared mouth, 8 is the indentation, 9 is the centering protrusion, 10 is the magnetic suction base, 11 is the card slot, 12 is the annular weld, 13 is the triangular groove, 14 is the rubber washer, 15 is the internal thread hole, 16 is the non-threaded section, 17 is the nylon ring, 18 is the external thread section, 19 is the first fluorescent strip, 20 is the second fluorescent strip. Detailed Embodiment

[0033] The following further describes the utility model in conjunction with the drawings and the detailed embodiment:

[0034] As Figures 1 to 4 shown, this embodiment provides a technical solution: a prestressed high-strength concrete pipe pile top ultra-long pile hoop, including a pile hoop cylinder 1, a high nut 2, a nut porcelain ring 3, a porcelain ring fixator 4, and a round head shear stud 5.

[0035] As an implementable mode, a top rib 6 is provided at the top of the pile sleeve hoop cylinder 1, a flared mouth 7 is provided at the bottom of the pile sleeve hoop cylinder, and a plurality of indentations 8 are provided on the pile sleeve hoop cylinder. When the pile sleeve hoop cylinder 1 is unfolded into a plane, the projection of the indentation 8 on this unfolded plane is circular. The indentations are arranged in rows, the indentations in the same row are equally spaced, and the indentations in adjacent rows are staggeredly arranged. The indentation 8 is provided with a centering protrusion 9. In this embodiment, the planar size of the pile sleeve hoop cylinder 1 after unfolding is 1884 mm × 600 mm, and the thickness is 4 mm. In other embodiments, the planar size of the pile sleeve hoop cylinder 1 after unfolding is jointly determined by the diameter of the pipe pile and the designed protection range of the pipe pile top, and the thickness is taken according to the design requirements. In this embodiment, the number of indentations in a single row of the indentation 8 is eight, with a total of three rows. The center point spacing of the indentations is 235.5 mm. The center point positions of the starting indentations in the first row and the third row are 176.6 mm away from the left edge of the unfolded plane of the pile sleeve hoop cylinder 1, and the center point position of the starting indentation in the second row is 58.9 mm away from the left edge of the unfolded plane of the pile sleeve hoop cylinder 1. In other embodiments, the number of indentations in a single row and the number of rows of the indentation 8 are jointly determined by the longitudinal steel bar reinforcement condition of the pipe pile and the shear resistance requirement of the pile sleeve hoop. The starting position of each row of indentations is related to the center point spacing of the indentations, and can take 1 / 4 or 3 / 4 times of the center point spacing.

[0036] As an implementable mode, the high nut 2 is provided with a magnetic attraction base 10. The magnetic attraction base 10 is matched with the indentation 8. Matching means that the magnetic attraction base 10 has the same arc shape as the indentation 8, and the diameter of the horizontal projection circle of the base of the magnetic attraction base 10 is 1 mm smaller than the diameter of the horizontal projection circle of the base of the indentation 8. The magnetic attraction base 10 and the indentation 8 are temporarily fixed by magnetic attraction and are connected by an annular welding band 12 after being adjusted in place. The bottom surface of the magnetic attraction base 10 is provided with a card slot 11. The card slot 11 is matched with the centering protrusion 9. Matching means that the card slot 11 has the same shape as the centering protrusion 9, and the depth of the card slot 11 is equal to the height of the centering protrusion 9. The high nut 2 is provided with an internal thread hole 15. The internal thread hole 15 is provided with a non-threaded section 16 at the top and a nylon ring 17 at the bottom. In this embodiment, the major diameter of the internal thread hole 15 of the high nut 2 is taken as 20 mm, and the height of the high nut 2 without the magnetic attraction base 10 is 1.2 times the major diameter of the internal thread hole 15. In other embodiments, the ratio of the height of the high nut 2 without the magnetic attraction base 10 to the major diameter of the internal thread hole 15 is determined by the shear resistance requirement, but is not less than 0.9. In this embodiment, the height of the non-threaded section 16 is 2.5 mm. In other embodiments, the value is taken according to the actual thread pitch of the internal thread hole.

[0037] As an implementable mode, the nut porcelain ring is provided with a triangular groove. In special cases where the nut porcelain ring cannot be taken out, it can be easily cut off from the position of the triangular groove.

[0038] As an implementable mode, the porcelain ring fixer is provided with a rubber washer for clamping the porcelain ring fixer.

[0039] As an implementable mode, the round head shear bolt is provided with an external thread section, the thread profile and size of the external thread section are matched with the internal thread of the high nut. The round head shear bolt should finally be screwed to the position of the nylon ring at the bottom of the internal thread hole of the high nut, and the self-locking force is provided by the nylon ring. The round head shear bolt is provided with a first fluorescent strip and a second fluorescent strip. The height of the first fluorescent strip is consistent with the height of the non-threaded section at the top of the internal thread hole of the high nut, and it can be completely immersed in the high nut when tightened. In this embodiment, the first and second fluorescent strips can be used for visual inspection of the assembly quality of the round head shear bolt. When one fluorescent strip is visible visually, it is qualified; when two fluorescent strips are visible visually, the assembly is not in place; when no fluorescent strip is visible visually, it means that the shear bolt is missing at this position.

[0040] The above embodiments are only the preferred embodiments of the present invention, and do not limit the implementation scope of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. An extra-long pile hoop at the top of a prestressed high-strength concrete pipe pile, characterized in that: It comprises a pile sleeve cylinder (1), a high nut (2), a nut ceramic ring (3), a ceramic ring fixer (4), and a round head shear nail (5); The top of the pile hoop cylinder (1) is provided with a top rib (6), the bottom of the pile hoop cylinder (1) is provided with a bell mouth (7), the middle of the pile hoop cylinder (1) is provided with a plurality of indentations (8), and a centering convex mark (9) is provided in each of the indentations (8); The high nut (2) is provided with a magnetic base (10), the magnetic base (10) is matched with the indentation (8), the magnetic base (10) and the indentation (8) are temporarily fixed by magnetic attraction and are connected by an annular welding belt (12) after being adjusted into place, and the bottom surface of the magnetic base (10) is provided with a slot (11), and the slot (11) is matched with the centering convex mark (9).

2. The super-long pile hoop at the top of the prestressed high-strength concrete pipe pile according to claim 1, characterized in that: The dimples (8) are arranged in rows, the dimples (8) in the same row are arranged at equal intervals, and the dimples (8) in adjacent rows are arranged in staggered rows.

3. The super-long pile hoop at the top of the prestressed high-strength concrete pipe pile according to claim 1, characterized in that: The high nut (2) is provided with an internal threaded hole (15), the internal threaded hole (15) is provided with a non-threaded section (16) at the top, and the internal threaded hole (15) is provided with a nylon ring (17) at the bottom.

4. The super-long pile hoop at the top of the prestressed high-strength concrete pipe pile according to claim 1, characterized in that: The nut ceramic ring (3) is provided with a triangular groove (13).

5. The super-long pile hoop at the top of the prestressed high-strength concrete pipe pile according to claim 1, characterized in that: The ceramic ring holder (4) is provided with a rubber gasket (14).

6. The super-long pile hoop at the top of the prestressed high-strength concrete pipe pile according to claim 1, characterized in that: The round-head shear nail (5) is provided with an external thread section (18), a first fluorescent strip (19), and a second fluorescent strip (20).

Images