Assembly-type pile-top connecting structure and construction method

Abstract

Provided in the present invention are an assembly-type pile-top connecting structure and a construction method. The assembly-type pile-top connecting structure comprises pile foundations, wherein a plurality of shear keys are welded to the outer side of the top of each pile foundation, pile-top connecting devices are provided on the pile foundations, the pile-top connecting devices on the plurality of adjacent pile foundations are fixedly connected, and precast beams for assembly are placed on the pile-top connecting devices; a steel sleeve is fixedly arranged at the bottom of a steel plate in each pile-top connecting device, a wedge-shaped support is fixedly arranged in the steel sleeve, the steel sleeve is located on the outer side of the top of a pile foundation, and the wedge-shaped support is supported on the inner side of the top of the pile foundation; and a water-stop rubber ring is provided between the inner side of the bottom of the steel sleeve and the pile foundation, and a grouting material fills the space between the steel sleeve and the pile foundation. Conventional pile caps are eliminated, and the pile foundations are directly connected to transverse and longitudinal precast beams and joints by means of the pile-top connecting devices, such that the green and industrialized construction of marine engineering structures is realized.

Description

Assembled pile top connection structure and construction method Technical Field

[0001] The present invention relates to the technical field of marine engineering building construction, and in particular to an assembled pile top connection structure and a construction method. Background Art

[0002] Pile-foundation marine structures are often subject to the influence of waves, currents, and tidal ranges, creating harsh construction environments. In recent years, with the rapid development of prefabricated technology in the construction industry, offshore structures have gradually adopted prefabricated structural design optimization. For example, the beams and slabs of high-pile piers have been designed from cast-in-place structures to prefabricated U-shaped shells, cast-in-place combinations, and fully prefabricated structures. This has improved construction efficiency to a certain extent. However, the pile top connection nodes still use traditional construction methods, which has become a construction pain point.

[0003] Traditionally, pile-top connection nodes are constructed using cast-in-place methods over water. For example, in the case of high-pile wharves, this involves constructing a complex bottom formwork support system using a large amount of steel sections, steel hoops, and base plates. The pile caps are then reinforced and concrete is poured in-place. Prefabricated horizontal and longitudinal beams are then installed on top of the pile caps. Finally, the nodes are reinforced and welded, and concrete is poured in-place. Key issues include: Traditional construction methods are complex and pose high safety risks in water operations under harsh sea conditions; Cast-in-place pile caps require a large workload, resulting in a long construction period and impacts on the marine environment; Due to the tidal range, pile caps and nodes are subject to repeated immersion in seawater, which can easily corrode the steel before pouring, severely impacting project quality. Summary of the Invention

[0004] The main purpose of the present invention is to provide an assembled pile top connection structure and a construction method to solve the problems in the above-mentioned background technology.

[0005] To solve the above technical problems, the present invention adopts a technical solution that includes: a pile foundation, a plurality of shear keys welded to the outer side of the top of the pile foundation, a pile top connection device provided on the pile foundation, the pile top connection devices on adjacent pile foundations are fixedly connected, and the assembled prefabricated beams abut against the pile top connection devices;

[0006] A steel sleeve is fixed to the bottom of the steel plate in the pile top connection device, and a wedge-shaped support is fixed inside the steel sleeve. The steel sleeve is located on the outside of the pile foundation top, and the wedge-shaped support rests on the inside of the pile foundation top.

[0007] A water-stop rubber ring is provided between the inner side of the bottom of the steel sleeve and the pile foundation, and grouting material is filled between the steel sleeve and the pile foundation;

[0008] The inner wall of the steel sleeve is provided with multiple shear keys.

[0009] Preferably, when the pile top connection device is installed, the steel plate is horizontal, and the steel sleeve is designed to be coaxially matched with the pile foundation.

[0010] Preferably, a plurality of corbels are fixed between the outer side of the steel sleeve and the steel plate, and vertical steel bars are fixed on the top of the steel plate.

[0011] Preferably, a pile core sealing plate is fixed to the bottom of the wedge-shaped support, and a grouting hole is provided at the bottom of the steel sleeve. The grouting hole is located above the water-stop rubber ring. The outer side of the water-stop rubber ring is fixed on the steel sleeve, and the inner side is inclined upward against the pile foundation.

[0012] Preferably, an overflow hole is provided at the top of the steel sleeve, and a communicating hole is provided between the wedge-shaped support and the steel sleeve, and the grouting material is filled into the wedge-shaped support through the hole.

[0013] A construction method for an assembled pile top connection comprises the following steps:

[0014] S1. Carry out underwater pile sinking construction and drive the pile foundation into the water according to the design requirements;

[0015] S2. Cut the piles according to the uniform elevation to ensure that the top of the pile foundation is flush, and weld multiple shear keys on the outside of the top of the pile foundation;

[0016] At the same time, the pile top connection device is prefabricated in the factory, and multiple shear keys are welded on the inner wall of the steel sleeve. It is processed according to the pile foundation structure to ensure that the steel plate is installed horizontally and the steel sleeve is coaxial with the pile foundation.

[0017] S3. The pile top connection device is transported to the construction site, the pile top connection device is classified and matched according to the pile position map, and the pile top connection device is hoisted;

[0018] The opening at the bottom of the hoisted and lowered steel sleeve is slowly inserted into the pile foundation, with the wedge-shaped support resting against the inner wall of the pile foundation until it reaches the designed position. The pile core sealing plate forms a seal with the inner wall of the pile foundation, and the water-stop rubber ring fits against the outer side of the pile foundation to form a seal.

[0019] S4. Connect the grouting holes through the grouting pump and grouting hose, and perform pressure grouting at the bottom of the steel sleeve to fill the steel sleeve and the wedge-shaped support with grouting material. Observe the overflow hole for overflow, indicating that the steel sleeve and the wedge-shaped support are fully filled.

[0020] S5. After the grouting material reaches a certain strength, multiple adjacent pile top connection devices are connected by connecting steel sections to firmly connect multiple pile foundations, thereby forming a pile top connection platform;

[0021] S6. After the construction of at least two bent-type pile top connection platforms is completed, prefabricated beams are installed, and prefabricated transverse beams and longitudinal beams are placed on the pile top connection platforms;

[0022] The bottom of the prefabricated cross beam is provided with at least two corbels of steel sleeves, and the bottom of the prefabricated longitudinal beam is provided with connecting steel sections for connecting multiple steel sleeves.

[0023] S7. Carry out node construction on the pile top connection platform, tie the connection steel cage between the precast beam and the vertical steel bars, assemble the formwork around the node, and then pour concrete to complete the node construction;

[0024] S8. Carry out construction on other working surfaces in sequence according to steps S1 to S7 until the main structure of the wharf is completed.

[0025] Preferably, the pile foundation is a straight pile, an inclined pile or a combined pile.

[0026] The present invention provides an assembled pile top connection structure and construction method, with the following beneficial effects:

[0027] 1. The present invention uses a steel sleeve to replace the traditional pile cap structure. The steel sleeve can be prefabricated as a whole in the factory and assembled on site. The pile top connection device assembled by the steel sleeve can be used as a construction platform for personnel and a platform for placing prefabricated horizontal and vertical beams. It avoids the need to set up a complex bottom formwork support system on the water and reduces the amount of cast-in-place concrete on the water. At the same time, the quality of the steel sleeve prefabricated in the factory is controllable and can be hoisted as a whole on site, shortening the construction period.

[0028] 2. A wedge-shaped support and a pile core sealing plate are set at the top of the steel sleeve, which is conducive to the precise positioning of the steel sleeve during installation and the sealing of the pile core; an oblique water-stop rubber ring is set at the bottom of the steel sleeve. During the installation and lowering of the steel sleeve, the water-stop rubber slides down smoothly, and after it is lowered into place and grouting, the deadweight of the grouting material causes the rubber to contact the pile foundation more closely, ensuring the water-stop sealing effect; shear keys are set on the inner wall of the steel sleeve and the outer wall of the steel pipe to enhance the bonding strength between the pile top structure and the pile foundation.

[0029] 3. During the construction of prefabricated transverse and longitudinal beam nodes, the bolt holes or clips reserved on the steel plate on the pile top connection device can be used as the node bottom formwork, and are convenient for the overall lifting of the node side formwork, which is conducive to the rapid construction of prefabricated marine engineering buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and examples:

[0031] FIG1 is a schematic diagram of pile foundation construction according to the present invention;

[0032] FIG2 is a front view of the pile top connection device of the present invention;

[0033] FIG3 is a top view of the pile top connection device of the present invention;

[0034] FIG4 is a schematic diagram of the installation of the pile top connection device of the present invention;

[0035] FIG5 is a schematic diagram showing the completion of grouting in a steel sleeve according to the present invention;

[0036] FIG6 is a schematic diagram of the installation of the connecting steel of the present invention;

[0037] FIG7 is a top view of the installation of the prefabricated beam of the present invention;

[0038] FIG8 is a front view of the installation of the prefabricated beam of the present invention;

[0039] FIG9 is a schematic diagram of the node construction of the present invention;

[0040] In the figure: pile foundation 1; shear key 2; pile top connection device 3; steel plate 301; steel sleeve 302; corbel 303; vertical steel bar 304; wedge support 305; pile core sealing plate 306; water-stop rubber ring 307; grouting hole 308; overflow hole 309; grouting pump 4; grouting hose 5; grouting material 6; connecting steel 7; precast beam 8; node 9. Modes for Carrying Out the Invention

[0041] Example 1

[0042] As shown in Figures 1 to 9, an assembled pile top connection structure includes a pile foundation 1, a plurality of shear keys 2 welded to the outer side of the top of the pile foundation 1, a pile top connection device 3 provided on the pile foundation 1, the pile top connection devices 3 on adjacent pile foundations 1 are fixedly connected, and an assembled prefabricated beam 8 rests on the pile top connection devices 3;

[0043] A steel sleeve 302 is fixed to the bottom of the steel plate 301 in the pile top connection device 3. A wedge-shaped support 305 is fixed inside the steel sleeve 302. The steel sleeve 302 is located on the outside of the top of the pile foundation 1, and the wedge-shaped support 305 is against the inside of the top of the pile foundation 1.

[0044] A water-stop rubber ring 307 is provided between the inner side of the bottom of the steel sleeve 302 and the pile foundation 1, and grouting material 6 is filled between the steel sleeve 302 and the pile foundation 1;

[0045] The inner wall of the steel sleeve (302) is provided with a plurality of shear keys (2). With this structure, a pile top connection device 3 is installed on the steel pipe pile in the driven pile foundation 1. The pile top connection devices 3 are fixedly connected to each other to form a pile top platform. The prefabricated beam 8 is placed on the pile top platform to carry out the node 9 construction, and the construction is completed. The pile top connection device 3 is placed on the top of the pile foundation 1, and the inside is positioned by the wedge support 305 against the steel pipe pile, and the outside is firmly connected to the steel pipe pile by grouting.

[0046] Preferably, when the pile top connection device 3 is installed, the steel plate 301 is horizontal, and the steel sleeve 302 is designed to be coaxial with the pile foundation 1. With this structure, the pile foundation 1 can be a straight pile, an inclined pile, or a combination pile. The structure of the pile top connection device 3 is designed to match the pile type to ensure that when the pile top connection device 3 is installed, the steel plate 301 is horizontal, and the steel sleeve 302 is coaxial with the pile foundation 1.

[0047] Preferably, a plurality of brackets 303 are fixed between the outer side of the steel sleeve 302 and the steel plate 301, and vertical steel bars 304 are fixed on the top of the steel plate 301. In this structure, the brackets 303 are used to strengthen the structure, and the vertical steel bars 304 are used to tie the steel bars with the precast beams 8 for pouring concrete.

[0048] Preferably, a pile core plugging plate 306 is fixed to the bottom of the wedge-shaped support 305, and a grouting hole 308 is provided at the bottom of the steel sleeve 302. The grouting hole 308 is located above the water-stop rubber ring 307. The outer side of the water-stop rubber ring 307 is fixed to the steel sleeve 302, and the inner side is inclined upward against the pile foundation 1. With this structure, the pile core plugging plate 306 is sealed to the inner side of the pile foundation 1, and the water-stop rubber ring 307 is sealed to the outer side of the pile foundation 1. Grouting material 6 is filled in the steel sleeve 302 and the wedge-shaped support 305, ensuring a secure connection with the pile foundation 1.

[0049] Preferably, an overflow hole 309 is provided at the top of the steel sleeve 302, and a connecting hole is provided between the wedge-shaped support 305 and the steel sleeve 302, through which the grouting material 6 is filled into the wedge-shaped support 305. With this structure, the grouting connection is achieved, so that the pile top connection device 3 is firmly connected to the pile foundation 1.

[0050] Example 2

[0051] As shown in Figures 1 to 9, in combination with Example 1, a construction method for an assembled pile top connection is further described, and the specific steps are as follows:

[0052] Step S1: Sinking piles in water. Taking a pair of inclined piles as an example, steel pipe piles with a diameter of 1200 mm are driven in according to the design requirements.

[0053] Step S2: Pile foundation 1 processing and pile top connection device 3 are prefabricated in the factory: the piles are cut according to a uniform elevation to ensure that the top 1 of the pile foundation is flush, and steel bars are welded in a circumferential direction on the upper end of the steel pipe pile, arranged at intervals of 300 mm, as steel pipe shear keys 2, as shown in Figure 1; at the same time, the pile top connection device 3 is prefabricated in the factory, and a single steel sleeve 302 and its accessories are made for inclined piles with different slopes, as shown in Figures 2 and 3. The steel sleeve 302 has a diameter of 1500 mm, and a 100 mm high wedge support 305 and a pile core sealing plate 306 are set inside the steel sleeve 302. The shear key 2 is welded on the inner wall of the steel sleeve 302, and 8 brackets 303 are welded around the outside. The steel plate 301 and vertical steel bars 304 are welded on the top of the steel sleeve 302.

[0054] Step S3: Hoisting of the pile top connection device 3: The pile top connection device 3 is transported from the factory to the construction site, and the hoisting operation of the pile top connection device 3 is carried out. As shown in Figure 4, the open end of the steel sleeve 302 is inserted upside down into the pile foundation 1 and slowly lowered. The wedge-shaped support 305 is inserted into the pile core, and the rubber around the pile core sealing plate 306 gradually contacts the inner wall of the pile foundation 1. The steel sleeve 302 slides down along the pile foundation 1 along with the wedge-shaped support 305, and the elevation and flatness of the top of the steel sleeve 302 automatically meet the design requirements; at the same time, in the process of lowering the steel sleeve 302, the water-stop rubber ring 307 arranged at the bottom end of the steel sleeve 302 slides down along the pile foundation 1. After the steel sleeve 302 is lowered into place, the water-stop rubber ring 307 is tilted upward, squeezed against the pile foundation 1, and in close contact.

[0055] Step S4: Grouting inside the steel sleeve 302: As shown in Figures 4 and 5, the grouting hose 5 of the steel sleeve 302 is connected to the grouting pump 4, and pressure grouting is performed from the bottom of the steel sleeve 302 from bottom to top. The pile foundation 1 and the grouting material 6 inside the steel sleeve 302 slowly rise to the top of the pile until the space from the top of the pile to the pile core sealing plate 306 is filled. Finally, the grouting material overflows from the overflow hole 309 at the top of the steel sleeve 302, indicating that the slurry inside the steel sleeve 302 is full.

[0056] Step S5: Welding the connecting steel 7 at the top of the pile: As shown in Figure 6, after the grouting material 6 forms a certain strength, the six connecting steels 7 are hung on the top of the steel sleeve 302, and two 2000mm long connecting steels 7 are welded to the brackets 303 of the front and rear pile foundations 1 on both sides, and two 500mm long connecting steels 7 are welded to the brackets 303 of the front and rear pile foundations 1 in the middle, so as to connect a pair of fork piles to form a whole.

[0057] Step S6: Installation of prefabricated beams 8: As shown in Figures 7 and 8, the prefabricated transverse beams and longitudinal beams are placed on the pile top connection platform, and the front and rear prefabricated transverse beams are respectively placed on the top of the two brackets of the steel sleeves 302 of the front and rear pile foundations 1; the left and right prefabricated longitudinal beams are respectively placed on the top of the two connecting steels 7 connecting the front and rear pile foundations 1.

[0058] Step S7: Node 9 Construction: As shown in Figure 9, the reinforcement for node 9 is welded. Side formwork is then assembled around the node, with the existing pile top platform at the bottom. The side formwork is hoisted as a whole and bolted to the steel plate of the pile top platform. Finally, concrete is poured, completing the node construction.

[0059] Step S8: Carry out construction on other working surfaces in sequence according to steps S1 to S7 until the main structure of the wharf is completed.

[0060] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An assembled pile top connection structure, characterized by: It comprises a pile foundation (1), a plurality of shear keys (2) are welded on the outer side of the top of the pile foundation (1), a pile top connection device (3) is provided on the pile foundation (1), the pile top connection devices (3) on the adjacent plurality of pile foundations (1) are fixedly connected, and the assembled prefabricated beam (8) is placed on the pile top connection device (3); A steel sleeve (302) is fixedly provided at the bottom of the steel plate (301) in the pile top connection device (3), a wedge-shaped support (305) is fixedly provided inside the steel sleeve (302), the steel sleeve (302) is located outside the top of the pile foundation (1), and the wedge-shaped support (305) abuts against the inside of the top of the pile foundation (1); A water-stop rubber ring (307) is provided between the inner side of the bottom of the steel sleeve (302) and the pile foundation (1), and a grouting material (6) is filled between the steel sleeve (302) and the pile foundation (1); A plurality of shear keys (2) are provided on the inner wall of the steel sleeve (302).

2. According to claim 1, the assembled pile top connection structure is characterized in that: When the pile top connection device (3) is installed, the steel plate (301) is in a horizontal position, and the steel sleeve (302) is designed to be coaxially matched with the pile foundation (1).

3. The assembled pile top connection structure according to claim 1 is characterized in that: A plurality of brackets (303) are fixedly arranged between the outer side of the steel sleeve (302) and the steel plate (301), and a vertical steel bar (304) is fixedly arranged on the top of the steel plate (301).

4. The assembled pile top connection structure according to claim 1 is characterized in that: A pile core plugging plate (306) is fixedly provided at the bottom of the wedge-shaped support (305), a grouting hole (308) is provided at the bottom of the steel sleeve (302), and the grouting hole (308) is located above the water-stop rubber ring (307). The outer side of the water-stop rubber ring (307) is fixed on the steel sleeve (302), and the inner side is inclined upward against the pile foundation (1).

5. The assembled pile top connection structure according to claim 1 is characterized in that: An overflow hole (309) is provided at the top of the steel sleeve (302), and a communicating hole is provided between the wedge-shaped support (305) and the steel sleeve (302), and the grouting material (6) is filled into the wedge-shaped support (305) through the hole.

6. A construction method for a prefabricated pile top connection according to any one of claims 1 to 5, wherein the steps are as follows: S1, performing underwater pile sinking construction, driving the pile foundation (1) in accordance with the design requirements; S2, cutting the piles according to a uniform elevation to ensure that the top of the pile foundation (1) is flush, and welding a plurality of shear keys (2) on the outer side of the top of the pile foundation (1); At the same time, a pile top connection device (3) is prefabricated in the factory, a plurality of shear keys (2) are welded on the inner wall of the steel sleeve (302), and the steel sleeve (302) is processed according to the structure matching of the pile foundation (1) to ensure that the steel plate (301) is installed horizontally and the steel sleeve (302) is coaxial with the pile foundation (1); S3, transporting the pile top connection device (3) to the construction site, classifying the pile top connection device (3) according to the pile position map, and performing a hoisting operation on the pile top connection device (3); The opening at the bottom of the hoisted lowered steel sleeve (302) is slowly inserted into the pile foundation (1), and the wedge-shaped support (305) is pressed against the inner wall of the pile foundation (1) until the designed position is reached, the pile core plugging plate (306) forms a seal with the inner wall of the pile foundation (1), and the water-stop rubber ring (307) fits the outer side of the pile foundation (1) to form a seal; S4, connecting the grouting hole (308) through the grouting pump (4) and the grouting hose (5), and performing pressure grouting at the bottom of the steel sleeve (302), so that the grouting material (6) fills the steel sleeve (302) and the wedge-shaped support (305), and observing the overflow hole (309) for overflow, indicating that the steel sleeve (302) and the wedge-shaped support (305) are fully filled; S5. After the grouting material (6) reaches a certain strength, the adjacent plurality of pile top connection devices (3) are connected by connecting steel sections (7) to securely connect the plurality of pile foundations (1), thereby forming a pile top connection platform; S6. After the construction of the pile top connection platform of at least two bents is completed, the prefabricated beams (8) are installed, and the prefabricated cross beams and longitudinal beams are placed on the pile top connection platform; The bottom of the prefabricated cross beam where it is placed is at least two brackets (303) of the steel sleeve (302), and the bottom of the prefabricated longitudinal beam where it is placed is a connecting steel (7) connecting multiple steel sleeves (302). S7, constructing the node (9) on the pile top connection platform, tying the connecting steel cage of the prefabricated beam (8) and the vertical steel bar (304), assembling the formwork around the node (9), and then pouring concrete to complete the construction of the node (9); S8. Carry out construction on other working surfaces in sequence according to steps S1 to S7 until the main structure of the wharf is completed.

7. A construction method for assembled pile top connection according to claim 6, wherein the pile foundation (1) is a straight pile, an inclined pile or a combined pile.

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