Pre-tensioning method FRP rib prestressed concrete pipe pile splicing mode and construction method

Abstract

The invention discloses a pre-tensioning method FRP rib prestressed concrete pipe pile splicing mode and a construction method, and belongs to the technical field of civil engineering pipe piles. A connecting plate is arranged between the upper end plate of the first section of tubular pile and the lower end plate of the second section of tubular pile; a fixing hole is formed in the connecting plate according to the position of a pile body anchoring sleeve; four T-shaped grooves are symmetrically formed in the side surfaces of the upper end plate and the lower end plate in a cross shape; a linear groove corresponding to the T-shaped groove in position is formed in the side surface of the connecting plate; the connecting plate and the two end plates are mechanically connected after I-shaped steel pieces are embedded into the grooves. During butt joint, the protruding anchoring sleeves on the end plate faces of the two sections of pipe piles are embedded into the fixing holes of the connecting plates, and rapid and accurate butt joint is achieved. And meanwhile, the two sections of pile bodies and the connecting plates are arranged, I-shaped grooves are formed in the side surfaces of the end plates and the connecting plates, and I-shaped steel pieces are embedded in the grooves, so that it is guaranteed that the prestressed concrete pipe pile still has excellent durability, stress performance and deformation performance in a complex environment after pile splicing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of civil engineering pipe piles, and particularly relates to a pre-tensioning method FRP tendon prestressed concrete pipe pile splicing method and construction method. BACKGROUND

[0002] The prestressed concrete pipe pile is a hollow cylindrical concrete prefabricated component made by applying prestress by the pre-tensioning method and using the centrifugal forming process. Compared with the traditional bored pile, it has more advantages in the design selection range, geological condition adaptability, splicing speed and reliability, construction efficiency and pile quality. The traditional prestressed concrete pipe pile is usually a common reinforced concrete structure, and the common reinforced concrete structure is extremely susceptible to environmental corrosion. Underground or underwater structural members often come into contact with seawater, salt lake water, deicing salt, saline soil and other highly corrosive substances, causing the steel bars and concrete to be corroded to varying degrees. These problems not only seriously damage the building itself, but also cause great damage to the environment, resulting in a huge waste of resources, economy and manpower, and making it impossible to achieve the green energy-saving goal.

[0003] Fiber reinforced polymer (FRP) as a new type of high-performance composite material has gradually attracted attention from the engineering field due to its many excellent properties. FRP tendon has good corrosion resistance and is not prone to corrosion in complex chemical environments such as acid, alkali and salt, effectively improving and ensuring the load-carrying capacity, ductility, seismic resistance, fatigue resistance and durability of the member, prolonging the service life of the member, and reducing the cost of later maintenance, repair and reinforcement.

[0004] Patent document CN114718059B discloses a pipe pile splicing method of a pipe pile connecting structure. The sleeve in the two-section pipe pile body is connected by a latch to form a composite long latch structure, the stress at the connecting position of the pipe pile end plate is transmitted to the pile body concrete, the deformation influence of the pipe pile connecting structure end plate is reduced, and the bending resistance of the pipe pile connecting structure is improved. However, this splicing method has high construction precision requirements, and the installation position and dimensional accuracy of the end plate, sleeve and latch are required to be high. When hoisting the upper pipe pile and the lower pipe pile to be connected, the end plates of the two pipe piles need to be accurately aligned, and the two ends of the latch need to be accurately inserted into the sleeves of the upper and lower pipe piles. This requires high hoisting precision and positioning accuracy of the pipe pile, and the construction difficulty is high, especially when the construction is carried out at sea or in complex geological conditions, the difficulty and risk are higher. If there is a slight deviation during construction, the latch may not be inserted smoothly or the threaded connection may not be firm, affecting the connection quality.

[0005] In addition, the traditional prestressed concrete pipe pile is mostly connected by directly welding the end plates of two sections of piles, but the end face of the end plate of the pipe pile after production has a cylindrical protrusion formed by cutting off the anchoring sleeve to ensure the continuous application of prestress, so the pipe pile cannot be directly welded and connected. SUMMARY

[0006] The purpose of the present application is to solve the problems of the prior art, provide a pre-tensioning method FRP tendon prestressed concrete pipe pile connection method and construction method, which fundamentally solves the problem of connecting the pipe pile, and sets a connecting plate between the end plates of two sections of piles during connection, the connecting plate has fixing holes according to the protruding position of the pile anchoring sleeve, and the protruding anchoring sleeve on the end plate face of the two sections of pipe piles is embedded in the fixing hole to realize precise butt joint. Finally, the two sections of piles and the connecting plate are connected by opening a I-shaped slot on the side surface of the end plate and the connecting plate, embedding a I-shaped steel piece in the slot, and screwing the screw rod on the steel piece into the connecting plate. The prestressed concrete pipe pile connected in this way still has excellent durability, stress performance and deformation performance in complex environments.

[0007] To achieve the above purpose, the present application adopts the following technical scheme: a pre-tensioning method FRP tendon prestressed concrete pipe pile connection construction method, in which a connecting plate is arranged between the upper end plate of the first section of pipe pile and the lower end plate of the second section of pipe pile during the connection process; four T-shaped slots are symmetrically arranged on the side surfaces of the upper end plate and the lower end plate; a I-shaped slot corresponding to the position of the T-shaped slot is arranged on the side surface of the connecting plate; the connecting plate and the two end plates are mechanically connected by embedding a I-shaped steel piece in each slot, and the specific steps are as follows: Step one, the connecting plate, the I-shaped steel piece, and the FRP prestressed concrete first section of pipe pile and the second section of pipe pile are prefabricated in the factory, and then they are transported to the construction site for connection; Step two, after the first section of pipe pile is sunk, the second section of pipe pile to be connected is hoisted to the vicinity of the pile machine and placed on the flat ground, the pile body quality is checked to ensure that there is no crack, honeycomb, and pitted defects, and then the next step of construction can be carried out; Step three, before the pipe pile butt joint operation, the surface of the upper end plate, the lower end plate, and the protruding end plate anchoring sleeve is thoroughly cleaned with an iron brush to ensure that there is no impurity and dirt; Step four, when the pipe pile is connected, it is carried out at the position where the pile head is 0.5-1.0 m above the ground, and a guide hoop is arranged to ensure that the first section of the pipe pile is correctly positioned, and the upper and lower pile sections are kept straight, and the misalignment deviation is not more than 2 mm; the connecting plate is stably placed on the upper end plate of the first section of the pipe pile, the second section of the pipe pile is slowly and accurately connected with the first section of the pipe pile on which the connecting plate is placed by using hoisting equipment, and it is ensured that the center lines of the T-shaped grooves on the upper and lower end plates are on a straight line with the center line of the one-shaped groove on the connecting plate, forming an I-shaped groove; Step five, the I-shaped steel piece is embedded in the I-shaped groove, and the screw rod is screwed into the screw hole for mechanical connection.

[0008] A pipe pile connecting structure of a pre-tensioning method FRP tendon prestressed concrete pipe pile in a new way, the connecting structure comprises an upper end plate of a first section of pipe pile and a lower end plate of a second section of pipe pile and a connecting plate arranged between the two, four T-shaped grooves are symmetrically arranged on the side surfaces of the upper end plate and the lower end plate; a one-shaped groove is arranged on the side surface of the connecting plate corresponding to the position of the T-shaped groove; the T-shaped groove and the one-shaped groove are combined into an I-shaped groove, and an I-shaped steel piece is embedded in the I-shaped groove to realize fixed connection.

[0009] The connecting plate is processed with connecting plate fixing holes one by one according to the actual distribution positions of the upper end plate anchoring hole and the lower end plate anchoring hole, and the diameter size of the connecting plate fixing hole is slightly larger than the outer diameter of the anchoring sleeve.

[0010] The diameter size of the connecting plate fixing hole is 2-5 mm larger than the outer diameter of the anchoring sleeve.

[0011] The I-shaped steel piece is connected with a screw rod; a screw hole matched with the screw rod is arranged in the one-shaped groove; after the I-shaped steel piece is embedded in the groove, the screw rod is screwed into the matched screw hole for mechanical connection and fixation.

[0012] The first section of pipe pile and the second section of pipe pile are both FRP tendon prestressed concrete pipe piles, which comprise a tendon cage and upper end plates and lower end plates connected to both ends of the tendon cage; the tendon cage comprises anchoring sleeves, FRP longitudinal tendons and FRP spiral hoop tendons, the anchoring sleeves are connected with the upper end plates and the lower end plates respectively, and are connected by the FRP longitudinal tendons therebetween, and the FRP longitudinal tendons are connected by the FRP spiral hoop tendons to form an integral body.

[0013] Compared with the prior art, the technical effects of the present application are as follows: 1. The connecting plate and the I-shaped steel piece of the pre-tensioning method FRP tendon prestressed concrete pipe pile provided by the present application solve the problem that the pipe pile cannot be directly welded and connected due to the construction process of the pipe pile.

[0014] 2. The pipe pile connecting method and construction method provided by the application have the advantages that the connecting plate and the I-shaped steel part are prefabricated in a factory, the workload of the construction site is reduced, the construction efficiency is improved, the quality and precision of the parts are guaranteed, and errors and quality problems caused by on-site processing are avoided.

[0015] 3. The pipe pile connecting method and construction method provided by the application have the advantages that the anchoring sleeve, the fixing hole of the connecting plate and the screw rod matched with the screw hole of the I-shaped steel part are cooperated, when the connecting plate is placed on the end plate of the first section of the pile body and the anchoring sleeve is embedded in the fixing hole, and the I-shaped steel part is placed in the I-shaped groove formed by the end plate and the connecting plate and the screw rod is tightened, a stable connecting structure is formed, the integrity of the pipe pile joint is enhanced, the bearing capacity and stability of the structure are improved, and the pipe pile can still maintain a good connecting state when bearing various loads. The connecting method and construction method provide a method for the new type of pre-tensioned FRP tendon prestressed concrete pipe pile and lay a foundation for subsequent research on the FRP tendon pipe pile. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0017] Figure 1 is a schematic diagram of the pile connecting structure of the present application.

[0018] Figure 2 is a plan view of the upper end plate of the present application.

[0019] Figure 3 is a plan view of the lower end plate of the present application.

[0020] Figure 4 is a plan view of the pipe pile body of the present application.

[0021] Figure 5 is a plan view of the connecting plate of the present application.

[0022] Figure 6 is a front view of the connecting plate of the present application.

[0023] Figure 7 is a sectional view of the connecting plate of the present application.

[0024] Figure 8 is a schematic diagram of the longitudinal reinforcement of the pile of the present application.

[0025] Figure 9 is a schematic diagram of the I-shaped steel part of the present application.

[0026] Figure 10It is a schematic diagram of the screw of the application.

[0027] In the figure: 1, connecting plate; 11, T-shaped groove; 12, straight groove; 13, I-shaped steel piece; 131, screw; 132, screw hole; 2, upper end plate; 201, upper end plate anchoring hole; 202, upper end plate over-punching groove; 203, upper end plate tensioning hole; 3, lower end plate; 301, lower end plate anchoring hole; 302, lower end plate over-punching groove; 303, lower end plate tensioning hole; 4, reinforcement cage; 41, anchoring sleeve; 42, FRP longitudinal reinforcement; 43, FRP spiral stirrup; 5, first section of pipe pile; 6, second section of pipe pile; 101, connecting plate fixing hole. DETAILED DESCRIPTION

[0028] The application will be described in further detail below with reference to the drawings and specific embodiments. In order to enable those skilled in the art to better understand the technical solutions of the application, the application will be described in further detail below with reference to the embodiments and the drawings. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the application.

[0029] In the description of the application, terms such as “inner side surface”, “outer side surface”, “upper end plate” and “lower end plate”, the “inner side surface” thereof refers to the side end surface close to the pipe pile body, the “outer side surface” refers to the side end surface away from the pipe pile body. The “upper end plate” refers to the end plate exposed to the ground side when the pipe pile is connected, and the “lower end plate” refers to the end plate buried in the ground side when the pipe pile is connected. These terms are set only to facilitate the description of the application, and the content of the application is simplified, so these expressions should not be understood as a limitation on the application.

[0030] Example 1

[0031] As shown in Figure 1 A pre-tensioned FRP tendon prestressed concrete pipe pile connecting structure in a new way, the connecting structure comprises an upper end plate 2 of a first section of pipe pile 5 and a lower end plate 3 of a second section of pipe pile 6 and a connecting plate 1 arranged between the two, as shown in Figures 2-3 Four T-shaped grooves 11 are symmetrically arranged on the side surfaces of the upper end plate 2 and the lower end plate 3, respectively. Figures 5-7 A straight groove 12 corresponding to the position of the T-shaped groove is arranged on the side surface of the connecting plate 1, the T-shaped groove 11 and the straight groove 12 are combined into an I-shaped groove, and an I-shaped steel piece 13 is embedded in the I-shaped groove to achieve fixed connection.

[0032] The connecting plate 1 is processed with a connecting plate fixing hole 101 according to the actual distribution position of the upper end plate anchoring hole 201 and the lower end plate anchoring hole 301, and the diameter of the connecting plate fixing hole 101 is slightly larger than the outer diameter of the anchoring sleeve 41.

[0033] The connecting plate fixing hole 101 has a hole diameter that is 2-5 mm larger than the outer diameter of the anchoring sleeve 41.

[0034] As shown in Figure 9 , Figure 10 , the I-shaped groove 12 has a screw hole 132 that matches the screw rod 131; after the I-shaped steel piece 13 is embedded in the groove, the screw rod 131 is screwed into the matching screw hole 132 to perform mechanical connection and fixation.

[0035] As shown in Figure 4 , Figure 8 , the first section pipe pile 5 and the second section pipe pile 6 are both FRP tendon prestressed concrete pipe piles, which include a tendon cage 4 and upper and lower end plates 2 and 3 connected to the two ends of the tendon cage 4; the tendon cage 4 includes anchoring sleeves 41, FRP longitudinal tendons 42, and FRP spiral stirrups 43, the anchoring sleeves 41 are connected to the upper and lower end plates 2 and 3, respectively, and are connected by the FRP longitudinal tendons 42, and the FRP longitudinal tendons 42 are connected by the FRP spiral stirrups 43 to form an integral body.

[0036] Embodiment 2

[0037] A pre-tensioning method for connecting FRP tendon prestressed concrete pipe piles and a construction method, in which a connecting plate 1 is arranged between the upper end plate 2 of the first section pipe pile 5 and the lower end plate 3 of the second section pipe pile 6 during the connecting process; four T-shaped grooves 11 are symmetrically arranged on the side surfaces of the upper and lower end plates 2 and 3; a I-shaped groove 12 is arranged on the side surface of the connecting plate 1 and corresponds to the position of the T-shaped groove; the connecting plate 1 and the two end plates are mechanically connected by using I-shaped steel pieces 13 embedded in the grooves, and the method specifically includes the following steps: Step one, the connecting plate 1, the I-shaped steel piece 13, and the FRP prestressed concrete first section pipe pile 5 and the second section pipe pile 6 are prefabricated in the factory, and then they are transported to the construction site for pile connection; Step two, after the first section pipe pile 5 is completely sunk, the second section pipe pile 6 to be connected is hoisted to the vicinity of the pile machine and placed on the flat ground, the pile body quality is checked to ensure that there are no cracks, honeycombs, and pitted defects in the pile body before the next construction is performed; Step three, before the pipe pile butt joint operation is performed, an iron brush is used to thoroughly clean the surfaces of the upper and lower end plates 2 and 3 and the protruding end plate flat anchoring sleeve 41 to ensure that there is no impurity and dirt; Step four, when the pipe pile is connected, it is carried out at the position where the pile head is 0.5-1.0m above the ground, and a guide hoop is arranged to ensure that the first section of pipe pile 5 is correctly positioned, and the upper and lower pile sections are kept straight, and the misalignment deviation is not more than 2mm; the connecting plate 1 is stably placed on the upper end plate 2 of the first section of pipe pile 5, the second section of pipe pile 6 is slowly and accurately connected with the first section of pipe pile 5 on which the connecting plate 1 has been placed by using hoisting equipment, and it is ensured that the center line of the T-shaped slot 11 on the upper end plate 2 and the lower end plate 3 can be on a straight line with the center line of the one-shaped slot 12 on the connecting plate 1, to form an I-shaped slot; Step five, the I-shaped steel piece 13 is embedded into the I-shaped slot, and the screw rod 131 is screwed into the screw hole 132 to be mechanically connected.

[0038] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for splicing prestressed concrete pipe piles with pre-tensioned FRP tendons, characterized in that, a splicing structure of the pre-tensioned FRP tendon prestressed concrete pipe pile with a new method comprises an upper end plate (2) of a first section pipe pile (5), a lower end plate (3) of a second section pipe pile (6), and a connecting plate (1) arranged between the two; four T-shaped grooves (11) are symmetrically arranged on the side surfaces of the upper end plate (2) and the lower end plate (3); a straight groove (12) corresponding to the T-shaped groove is arranged on the side surface of the connecting plate (1); the T-shaped groove (11) and the straight groove (12) are combined into an H-shaped groove, and an H-shaped steel piece (13) is embedded in the H-shaped groove; the H-shaped steel piece (13) is mechanically connected after being embedded in each groove by using a bolt; the connecting plate (1) is processed with connecting plate fixing holes (101) according to the actual distribution positions of the upper end plate anchoring hole (201) and the lower end plate anchoring hole (301); the diameter of the connecting plate fixing hole (101) is larger than the outer diameter of the anchoring sleeve (41); the method comprises the following steps: Step one, the connecting plate (1), the H-shaped steel piece (13), the first section FRP prestressed concrete pipe pile (5), and the second section pipe pile (6) are prefabricated in the factory, and then transported to the construction site for splicing; Step two, after the first section pipe pile (5) is sunk, the second section pipe pile (6) to be spliced is hoisted to the vicinity of the pile machine and placed on the flat ground, the pile body quality is checked to ensure that there is no crack, honeycomb, and pitted defects in the pile body before the next step of construction is performed; Step three, before the pipe pile butt joint operation is performed, the surface of the upper end plate (2), the lower end plate (3), and the protruding end plate flat anchoring sleeve (41) is thoroughly cleaned with a brush to ensure that there is no impurities and dirt; Step four, the pipe pile splicing is performed at a position where the pile head is 0.5-1.0 m above the ground, and a guide hoop is arranged to ensure that the first section pipe pile (5) is correctly positioned, and the upper and lower pile sections are straight, with a deviation of not more than 2 mm; the connecting plate (1) is placed stably on the upper end plate (2) of the first section pipe pile (5), the second section pipe pile (6) is slowly and accurately connected with the first section pipe pile (5) with the placed connecting plate (1) by using hoisting equipment, and the center line of the T-shaped groove (11) on the upper end plate (2) and the lower end plate (3) is on the same straight line with the center line of the straight groove (12) on the connecting plate (1) to form an H-shaped groove; Step five, the H-shaped steel piece (13) is embedded in the H-shaped groove, and the screw rod (131) is screwed into the screw hole (132) to be mechanically connected.

2. The pre-stressed concrete pipe pile splicing method according to claim 1, characterized in that, The pipe pile splicing construction method is suitable for a prestressed concrete pipe pile with FRP tendons as longitudinal reinforcement and provided with anchoring sleeves (41) at both ends; after the pipe pile is produced, the anchoring sleeves (41) at both ends of the FRP tendons outside the truncated end plate are cut off, and the length of the anchoring sleeve (41) is retained as 10 mm; the remaining part forms a cylindrical protrusion.

3. The pre-stressed concrete pipe pile splicing method according to claim 1, characterized in that, The diameter of the connecting plate fixing hole (101) is 2-5 mm larger than the outer diameter of the anchoring sleeve (41).

4. The pre-stressed concrete pipe pile splicing method according to claim 1, characterized in that, The I-shaped steel piece (13) is connected with a screw rod (131); a screw hole (132) matched with the screw rod (131) is formed in the I-shaped groove (12); after the I-shaped steel piece (13) is embedded into the groove, the screw rod (131) is screwed into the matched screw hole (132) to be mechanically connected and fixed.

5. The method according to any one of claims 1-4, characterized in that, The first section pipe pile (5) and the second section pipe pile (6) are both FRP-steel reinforced prestressed concrete pipe piles, comprising a steel cage (4) and upper end plates (2) and lower end plates (3) connected to two ends of the steel cage (4); the steel cage (4) comprises anchoring sleeves (41), FRP longitudinal steel bars (42) and FRP spiral stirrups (43); the anchoring sleeves (41) are connected to the upper end plates (2) and the lower end plates (3) respectively and connected by the FRP longitudinal steel bars (42) in between; the FRP longitudinal steel bars (42) are connected into an integral whole by the FRP spiral stirrups (43) in between.

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