Ultrahigh-toughness connecting structure for precast pile core and steel pipe pile

Abstract

The utility model relates to the technical field of high-pile wharf pile foundation structures, in particular to an ultrahigh-toughness connecting structure for a precast pile core and a steel pipe pile. Comprising a pile core, a steel pipe pile and a grouting connecting structure, the pile core is of a reinforced concrete columnar structure, and a first limiting structure for increasing the contact area of a grouting material and the pile core is arranged on the circumferential outer side face of the pile core; the upper end of the steel pipe pile is open, a closed structure is arranged at the bottom of the pile core in the steel pipe pile, and a second limiting structure used for increasing the contact area of the grouting material and the steel pipe pile and a guiding structure used for guiding the pile core put into the steel pipe pile are arranged at the position close to the upper end in the steel pipe pile. The grouting connecting structure is a connecting structure formed by a grouting material filled between the pile core and the steel pipe pile after the pile core is inserted into the steel pipe pile. The connecting structure of the precast pile core and the steel pipe pile is extremely simple, stable and convenient to construct, the connecting strength of the precast pile core and the steel pipe pile through the grouting material is guaranteed, and the mounting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pile dock pile foundation structures, in particular to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile. Background Art

[0002] At present, prefabricated piles, i.e. steel pipe piles, are commonly used for pile foundations of high-pile docks. They have good adaptability to geology during construction, can sink piles quickly, and have fast construction and short construction period. The traditional dock pile foundation construction process is: first, the steel pipe piles are injected to complete the pile sinking. Then, the pile core steel cage is lowered, and concrete is poured into the steel pipe piles to complete the operation. In the traditional construction process, in areas with large tidal ranges, steel bars and concrete are easily soaked by seawater, and quality control is difficult. Affected by the tidal range, the operation window of the cast-in-place pile core is short, and the offshore operation volume is large.

[0003] The prefabrication and assembly connection of pile cores has many advantages. Through the prefabrication and assembly method, most of the pile core prefabrication work can be carried out on land, and then these prefabricated pile cores can be transported to the sea to connect with steel pipe piles. This method reduces the time of offshore construction and avoids the interference of bad weather at sea on the construction progress, thereby improving the overall construction efficiency. Offshore prefabrication and assembly can reduce the offshore construction process and operation time, reduce the number of offshore workers, and thus reduce labor costs. At the same time, since the prefabricated pile cores can be centrally produced in the factory, the factory's production equipment and processes can be fully utilized to improve production efficiency and reduce production costs. In addition, the production method of pile core prefabrication and assembly can perform precise quality control in the factory environment, so that the quality of the pile core is effectively guaranteed. Through the prefabrication and assembly method, the environmental impacts such as noise and pollution of offshore construction can be reduced, which is conducive to protecting the marine ecological environment. Offshore prefabrication and assembly can be flexibly adjusted according to different engineering needs to adapt to various complex marine environments and construction conditions.

[0004] For example, the Chinese invention patent with the patent number "CN115748670A" and the title "A socket-and-spigot prefabricated pile core and pile cap structure for high-pile docks and its construction method" discloses a socket-and-spigot prefabricated pile core and pile cap structure, which includes a pile core, a pile cap and a grouting stop structure; the pile cap is arranged above the pile core, the pile core and the pile cap are integrally cast by concrete, the pile core steel cage is buried in the pile core and partially extends into the pile cap, a pile cap steel cage is arranged in the pile cap, a circle of annular grooves is arranged at the bottom of the pile cap near the pile core, two channel holes are arranged in the pile cap that pass through along its height direction, at least one of the channel holes is used for grouting, and the other channel hole is used for overflow grouting, and the grouting stop structure is arranged at the bottom of the pile core. The pile core and the pile cap of this structure are direct socket-and-spigot structures, and after the pile core and the pile cap are socket-and-spigot, they are connected as a whole by grouting, avoiding the multiple links of welding corbels or fixing clamps, supporting formwork, tying steel bars, pouring concrete, and removing formwork on site, greatly reducing the on-site construction time and labor consumption, and improving work efficiency. However, this structure also has some problems. The grouting material of this structure directly enters the connection gap, but the connection surface of the connection part is not designed and adjusted in a targeted manner. The actual connection structure may not reach the required connection strength, and the bonding properties of the grouting material are not fully utilized, especially the ultra-high strength properties of the grouting material. The technical disadvantages brought about are that the connection length between the pile core and the steel pipe pile becomes longer, which increases the difficulty of on-site prefabrication, transportation and installation. Utility Model Content

[0005] The purpose of the utility model is to solve the deficiencies of the above-mentioned background technology and provide a super-high toughness connection structure between a prefabricated pile core and a steel pipe pile.

[0006] The technical solution of the utility model is: a prefabricated pile core and steel pipe pile ultra-high toughness connection structure, comprising:

[0007] A pile core, wherein the pile core is a reinforced concrete columnar structure, and a first limiting structure for increasing the contact area between the grouting material and the pile core is provided on the circumferential outer side of the pile core;

[0008] A steel pipe pile, wherein the upper end of the steel pipe pile is open, a closed structure is arranged at the bottom of the pile core in the steel pipe pile, a second limiting structure for increasing the contact area between the grouting material and the steel pipe pile is arranged near the upper end of the steel pipe pile, and a guiding structure for guiding the pile core to be lowered into the steel pipe pile;

[0009] A grouting connection structure is a connection structure formed by grouting material filled between the pile core and the steel pipe pile after the pile core is inserted into the steel pipe pile.

[0010] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the first limiting structure includes a plurality of key grooves on the outer end surface of the circumference of the pile core; the key grooves are annular grooves recessed along the radial direction, and the plurality of key grooves are arranged at intervals along the axial direction of the pile core.

[0011] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the keyway is a trapezoidal keyway with a cross-section that is smaller on the side close to the pile core axis and larger on the side away from the pile core axis and is an isosceles trapezoid.

[0012] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the second limiting structure includes a plurality of shear keys on the inner end face of the circumference of the steel pipe pile; the shear keys are annular steel bars welded to the inner end face of the circumference of the steel pipe pile, and the plurality of shear keys are arranged at intervals along the axial direction of the steel pipe pile.

[0013] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the guide structure includes a plurality of guide rings arranged on the inner end face of the circumference of the steel pipe pile; the guide ring is a circular ring that surrounds the outer side surface of the circumference of the pile core when the pile core is inserted into the steel pipe pile and limits the non-axial movement of the pile core, the guide ring is fixed to the circumferential side surface of the pile core by a plurality of radially extending connecting ribs, and the plurality of guide rings are arranged at intervals along the axial direction.

[0014] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, one end of the connection rib is fixed to the guide ring, and the other end is fixed to the shear key.

[0015] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the guide structure includes a plurality of guide rings arranged on the inner end face of the circumference of the steel pipe pile; the guide ring is a closed annular trumpet-shaped structure with a larger side close to the upper end of the steel pipe pile and a smaller side away from the upper end of the steel pipe pile, the guide ring is fixed to the circumferential side of the pile core by a plurality of radially extending connecting ribs, and the plurality of guide rings are arranged at intervals along the axial direction.

[0016] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, a plurality of T-shaped steel bars are arranged at the upper end of the pile core; the small end of the T-shaped steel bar extends into the interior of the pile core concrete and is fixedly connected to the main bars of the pile core steel cage, and the large end extends along the axis direction of the pile core to the outside of the pile core.

[0017] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, a lifting lug is installed at the upper end of the pile core.

[0018] According to an ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the closed structure includes a steel plate welded to the inner side of the steel pipe pile and a bottom sealing concrete poured on the steel plate.

[0019] According to the ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile provided in the present application, the upper end surface of the bottom sealing concrete is a horizontal end surface that is tightly fitted with the bottom surface of the pile core.

[0020] The advantages of the present application are as follows: 1. By adding a limiting structure capable of increasing the contact area of ​​the grouting material in the pile core and the steel pipe pile, the present application increases the strength of the connection between the grouting material and the pile core and the steel pipe pile, increases the pull-out strength of the pile core and the steel pipe pile in the axial direction, gives full play to the bonding performance of the grouting material, reduces the overlapping connection length of the pile core and the steel pipe pile, greatly reduces the difficulty of on-site prefabrication, transportation, and installation, and improves the efficiency of assembling the pile core and the steel pipe pile, which has great promotion value;

[0021] 2. The present application provides a plurality of keyways on the outer circumferential end surface of the pile core. When the grouting material enters between the pile core and the steel pipe pile, it can be filled into the keyways, thereby increasing the connection area and connection strength between the grouting connection structure and the pile core;

[0022] 3. The keyway is designed as a trapezoidal keyway structure in the present application, which can avoid dead angles in the keyway. The grouting material can enter the keyway in all directions and fully fill the keyway. In addition, the trapezoidal keyway is convenient for demoulding during prefabrication of the pile core, reducing the occurrence of missing edges and corners during demoulding.

[0023] 4. The present application sets a plurality of annular shear keys on the inner end face of the circumference of the steel pipe pile. The shear keys are equivalent to the protruding structures protruding from the inner end face of the circumference of the steel pipe pile. The shear keys can increase the contact area between the grouting material and the inner side of the steel pipe pile, enhance the connection strength between the grouting connection structure and the steel pipe pile, and the shear keys have a simple structure and are extremely convenient to install and use.

[0024] 5. The present application sets a guide ring on the inner side of the steel pipe pile, which can limit the non-axial movement of the pile core during the insertion of the pile core into the steel pipe pile, so that the pile core can enter the steel pipe pile according to the set coaxial mode, which greatly reduces the construction difficulty of the pile core inserting the steel pipe pile and improves the construction efficiency of the pile core inserting the steel pipe pile;

[0025] 6. The guide ring of the present application is directly connected to the shear key through the connecting rib, and its structure is simple, and the installation of the guide ring becomes extremely convenient. The shear key, the connecting rib and the guide ring can be directly welded together to form a combined structure, and then the whole structure is welded to the inner end surface of the circumference of the steel pipe pile, which greatly improves the efficiency of welding installation;

[0026] 7. The present application designs the guide ring as a closed trumpet-shaped structure, which facilitates the entry of the pile core and makes the guiding process of the pile core inserting into the steel pipe pile smoother;

[0027] 8. In the present application, T-shaped steel bars are installed on the pile core, which are connected to the main bars of the steel cage and exposed outside the pile core concrete. On the one hand, the structural strength of the entire steel cage is increased, and on the other hand, it is also convenient for connection with other structures;

[0028] 9. This application installs lifting lugs on the top of the pile core to facilitate lifting;

[0029] 10. The enclosed structure of the present application includes a steel plate and bottom-sealing concrete, and the combined structure formed is extremely simple and the construction is also extremely convenient;

[0030] 11. The upper end surface of the bottom sealing concrete of the present application is a horizontal end surface that fits the bottom surface of the pile core, which can effectively solve the problem of stability of the inclined pile lowering.

[0031] The connection structure of the prefabricated pile core and the steel pipe pile of the present application is extremely simple, the connection structure is stable, the construction is convenient, the strength of the grouting material connecting the prefabricated pile core and the steel pipe pile is guaranteed, the installation efficiency is greatly improved, and it has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : Schematic diagram of the connection structure between the pile core and the steel pipe pile of the present application (straight pile);

[0033] Figure 2 : Schematic diagram of the connection structure between the pile core and the steel pipe pile of the present application (inclined pile);

[0034] Figure 3 : A top view of the guide structure of the present application;

[0035] Figure 4 : Schematic diagram of the mold structure of this application;

[0036] Among them: 1—pile core; 2—steel pipe pile; 3—keyway; 4—shear key; 5—guide ring; 6—connecting ribs; 7—T-shaped steel bars; 8—lifting ears; 9—steel plate; 10—bottom sealing concrete; 11—mold; 12—rubber pad. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The present application relates to a prefabricated pile core and a steel pipe pile ultra-high toughness connection structure. The present application first prefabricates the pile core in a factory, then hoists the prefabricated pile core to the steel pipe pile insertion position, then inserts the prefabricated pile core into the steel pipe pile for installation, and finally pours grouting material between the prefabricated pile core and the steel pipe pile. After the grouting material solidifies, the prefabricated pile core is stably fixed in the steel pipe pile. The present application is provided with a limiting structure for enhancing the contact area of ​​the grouting material on the inner side of the prefabricated pile core and the steel pipe pile, which is used to enhance the contact area between the grouting material and the pile core and the steel pipe pile, thereby improving the connection strength between the pile core and the steel pipe pile. Compared with the prior art, the pile core and the steel pipe pile of the present application can achieve the required connection strength requirements with a small overlapping length, give full play to the bonding performance of the grouting material, and guarantee the connection strength of the grouting material to the greatest extent under the same conditions.

[0042] Specifically, Figures 1 to 3 As shown, the ultra-high toughness connection structure of the prefabricated pile core and the steel pipe pile of the present application comprises a pile core 1, a steel pipe pile 2 and a grouting connection structure. The pile core 1 is a reinforced concrete columnar structure. The outer circumferential side of the pile core 1 is provided with a first limiting structure for increasing the contact area between the grouting material and the pile core 1. The pile core 1 is prefabricated in a factory based on a mold 11. The mold 11 of the present application adopts a left-right opening and closing structure, such as Figure 4 As shown, the prefabricated prefabricated pile core 1 is a cylindrical structure, and the diameter of the lower end is slightly smaller than the diameter of the upper end, so that it is easy to insert into the steel pipe pile 2; the upper end of the steel pipe pile 2 is open, and a closed structure is arranged at the bottom of the pile core 1 in the steel pipe pile 2, which makes it convenient for subsequent grouting to avoid excessive consumption of grouting materials, and a second limiting structure for increasing the contact area between the grouting material and the steel pipe pile 2 and a guiding structure for guiding the pile core 1 to be lowered into the steel pipe pile 2 are arranged near the upper end of the steel pipe pile 2; the grouting connection structure is a connection structure formed by the grouting material filled between the pile core 1 and the steel pipe pile 2 after the pile core 1 is inserted into the steel pipe pile 2.

[0043] During actual construction, the prefabricated pile core 1 is manufactured in the factory based on the mold 11, and the steel pipe pile 2 is prepared in the factory. The second limiting structure, the guide structure and the closing structure are welded on the inner side of the steel pipe pile 2, and then the steel pipe pile 2 is sunk. After the sinking is completed, the steel pipe pile 2 is pumped out; the pile core 1 is transported to the on-site operation area of ​​the high-pile wharf, and the pile core 1 is lifted by lifting equipment such as a car crane and a floating lifting vessel, and lowered into the steel pipe pile 2. The lowering of the pile core 1 is guided based on the guide structure. After the pile core 1 is lowered into the closed structure position, the grouting material is injected into the gap between the pile core 1 and the steel pipe pile 2; the grouting material is fully filled between the pile core 1 and the steel pipe pile 2, and the installation operation of the pile core 1 and the steel pipe pile 2 is completed.

[0044] In some embodiments of the present application, the first limiting structure is optimized. Figure 1 and 2 As shown, the first limiting structure of this embodiment includes a plurality of key grooves 3 on the outer circumferential end surface of the pile core 1 , the key grooves 3 are annular grooves recessed in the radial direction, and the plurality of key grooves 3 are arranged at intervals along the axial direction of the pile core 1 .

[0045] Use Figure 4 The mold 11 shown is used to prepare the pile core 1, and a rubber pad 12 is installed on the inner end face of the circumference of the mold 11. During pouring, the tied steel cage of the pile core 1 is first lowered into the mold 11, and then concrete is poured into the mold 11. After the concrete solidifies, the mold is removed to form the pile core 1. Among them, the rubber pad 12 will form a keyway 3 on the outer end face of the circumference of the pile core 1 formed at the end, and the keyway 3 will be filled into the keyway 3 after the pile core 1 is inserted into the steel pipe pile 2 and the grouting material is injected. The solidified grouting material will finally form a stable connection structure with the pile core 1.

[0046] In addition, in order to avoid the key slot 3 from forming a dead angle, the key slot 3 of this embodiment is structured as follows Figure 1 and 2 As shown, the keyway 3 is a trapezoidal keyway with a cross-section of an isosceles trapezoid, which is small on the side close to the axis of the pile core 1 and large on the side away from the axis of the pile core 1. That is, the keyway 3 is an open structure with a small inner side and a large outer side. Such a structure facilitates the grouting material to fully enter the keyway 3, and no dead angle is formed in the keyway 3, further improving the tightness of the connection between the grouting material and the pile core 1. At the same time, in the process of preparing the pile core 1, the present embodiment also uses a trapezoidal rubber pad 12 to construct the keyway 3. Such a structure facilitates demoulding and can also effectively reduce the situation of missing edges and corners during demoulding.

[0047] In other embodiments of the present application, the structure inside the steel pipe pile installed above is optimized. Specifically, Figure 1 and 2As shown, the second limiting structure of this embodiment includes a plurality of shear keys 4 on the inner end face of the circumference of the steel pipe pile 2. The shear keys 4 are annular steel bars welded to the inner end face of the circumference of the steel pipe pile 2. The plurality of shear keys 4 are arranged at intervals along the axial direction of the steel pipe pile 2. The shear keys 4 are protruding structures protruding from the inner end face of the circumference of the steel pipe pile 2, which can also increase the contact area between the grouting material and the steel pipe pile 2, and improve the connection strength and stability between the grouting material and the steel pipe pile 2. The shear keys 4 are welded to the inner side of the circumference of the steel pipe pile 2 and protrude from the inner side of the circumference of the steel pipe pile 2. When the shear keys 4 are filled with the grouting material, the pull-out resistance of the grouting material and the steel pipe pile 2 along the axial direction can be effectively increased.

[0048] like Figure 1 As shown, a guide structure of the present embodiment includes a plurality of guide rings 5 ​​arranged on the inner end surface of the circumference of the steel pipe pile 2. The guide ring 5 is a circular ring that surrounds the outer circumferential surface of the pile core 1 when the pile core 1 is inserted into the steel pipe pile 2 and limits the non-axial movement of the pile core 1. The guide ring 5 is fixed to the circumferential side surface of the pile core 1 by a plurality of radially extending connecting ribs 6. The plurality of guide rings 5 ​​are arranged at intervals along the axial direction.

[0049] The guide ring 5 is an annular structure welded inside the steel pipe pile 2 before the steel pipe pile 2 is sunk. The guide ring 5 is sleeved onto the outside of the pile core 1, which can ensure that the pile core 1 is inserted into the steel pipe pile 2 according to the set axial direction, greatly reducing the difficulty of use and improving the efficiency and accuracy of inserting the pile core 1 into the steel pipe pile 2.

[0050] like Figures 1 to 3 As shown, one end of the connecting rib 6 of this embodiment is fixed on the guide ring 5, and the other end is fixed on the shear key 4. Such an arrangement makes the installation of the guide ring 5 extremely convenient, and the shear key 4, the connecting rib 6 and the guide ring 5 can be directly welded together to form a combined structure, and then the whole structure is welded to the inner end surface of the circumference of the steel pipe pile 2, which greatly improves the efficiency of welding installation.

[0051] like Figure 2 As shown, another guide structure of the present embodiment includes a plurality of guide rings 5 ​​arranged on the inner end surface of the circumference of the steel pipe pile 2. The guide ring 5 is a closed annular trumpet-shaped structure with a larger side close to the upper end of the steel pipe pile 2 and a smaller side away from the upper end of the steel pipe pile 2. The guide ring 5 is fixed to the circumferential side surface of the pile core 1 by a plurality of radially extending connecting ribs 6. The plurality of guide rings 5 ​​are arranged at intervals along the axial direction.

[0052] Designing the guide ring 5 to be a trumpet-shaped closing structure can greatly facilitate the guiding and limiting of the pile core 1, and the process of inserting the pile core 1 into the steel pipe pile 2 becomes smoother and the operation is simpler.

[0053] In a further embodiment of the present application, the structure of the pile core 2 is optimized. Specifically, Figure 1 and2 As shown, a plurality of T-shaped steel bars 7 are arranged at the upper end of the pile core 1 of this embodiment, the small end of the T-shaped steel bars 7 extends into the concrete of the pile core 1 and is fixedly connected to the main reinforcement of the steel cage of the pile core 1, and the large end extends along the axial direction of the pile core 1 to the outside of the pile core 1.

[0054] During the prefabrication of the pile core 1, the T-shaped steel bar 7 is welded and fixed to the steel cage, the T-shaped steel bar 7 is welded and fixedly connected to the main reinforcement, and then placed in the mold 11 for casting, and the large end of the T-shaped steel bar 7 on the pile core 2 is finally exposed, which is convenient for subsequent connection with other structures. The T-shaped steel bar 7 increases the structural strength of the entire steel cage on the one hand, and is also convenient for connection with other structures on the other hand.

[0055] In order to facilitate lifting and transportation, a lifting lug 8 is installed on the upper end of the pile core 1 in this embodiment.

[0056] In the preferred embodiment of the present application, the above-mentioned closed structure is optimized. Specifically, Figure 1 and 2 As shown, the closed structure of this embodiment includes a steel plate 9 welded to the inner side of the steel pipe pile 2 and a bottom seal concrete 10 poured on the steel plate 9. The upper end surface of the bottom seal concrete 10 is a horizontal end surface that is closely attached to the bottom surface of the pile core 1.

[0057] For some vertical piles, the bottom of the pile core 1 is a straight end face, so the upper end face of the poured bottom concrete 10 is also a straight horizontal end face; for some inclined piles, the bottom of the pile core 1 is a straight end face, and the upper end face of the poured bottom concrete 10 is also a straight horizontal end face, which can effectively solve the problem of the stability of the inclined piles.

[0058] The steel plate 9 of this embodiment is welded and fixed inside the steel pipe pile 2 before the steel pipe pile 2 is sunk. The steel plate 9 completely seals the steel pipe pile 2. After the sinking is completed, concrete is poured into the steel pipe pile 2 to form a bottom sealing concrete 10 on the steel plate 9.

[0059] During actual construction, the steel pipe pile 2 is welded and arranged in the factory, a steel plate 9 is welded near 1m of the design position of the lower end of the pile core 1 in the steel pipe pile 2, and multiple layers of shear keys 4 are welded on the upper end of the steel pipe pile 2. The distance between the first layer of shear keys 4 and the upper end of the steel pipe pile 2 is 20cm, and the spacing between adjacent shear keys 4 is designed according to the design bearing performance of the pile foundation; connecting ribs 6 are welded on the shear keys 4, and guide rings 5 ​​are welded on the connecting ribs 6. There are two groups of guide rings 5, which are respectively located on the uppermost shear keys 4 and the lowermost shear keys 4; the steel pipe pile 2 is transported to the high-pile wharf operation area for pile sinking. After the pile sinking is completed, concrete is poured into the steel pipe pile 2, and the concrete forms a bottom seal concrete 10 on the steel plate 9;

[0060] The pile core 2 is prefabricated in a factory, the pile core 2 is prefabricated using a mold 11, a steel cage is tied, a lifting lug 8 and a T-shaped steel bar 7 are welded and fixed on the steel cage, and then the tied steel cage is placed in the mold 11, and concrete is poured to form the required pile core 1, and the circumferential side of the pile core 1 is formed with a rubber pad 12 to form the required keyway 3;

[0061] The pile core 1 is transported to the on-site operation area of ​​the high-pile wharf, and the top lifting lug 8 of the pile core 1 is lifted by a lifting equipment such as a truck crane and a floating lifting vessel, and lowered into the steel pipe pile 2. The lower end of the pile core 1 passes through the guide ring 5, and under the guidance of the guide ring 5, it is slowly lowered onto the bottom sealing concrete 10. After being lowered into place, grouting material is injected into the gap between the pile core 1 and the steel pipe pile 2. The grouting material is filled into the pile core 1 and the steel pipe pile 2, and filled into the keyway 3. Finally, all the shear keys 4, the guide ring 5 and the connecting ribs 6 are completely covered. After the grouting material is stable, the connection construction of the pile core 1 and the steel pipe pile 2 is completed.

[0062] like Figure 3 As shown, the axial direction of the present application Figure 3 The direction perpendicular to the paper plane, the radial direction of this application refers to Figure 3 The direction radiates outwards from the center of pile core 1.

[0063] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A prefabricated pile core and steel pipe pile ultra-high toughness connection structure, characterized in that: include, A pile core (1), wherein the pile core (1) is a reinforced concrete columnar structure, and a first limiting structure for increasing the contact area between the grouting material and the pile core (1) is provided on the circumferential outer side surface of the pile core (1); A steel pipe pile (2), wherein the upper end of the steel pipe pile (2) is open, a closed structure is provided inside the steel pipe pile (2) at the bottom of the pile core (1), a second limiting structure for increasing the contact area between the grouting material and the steel pipe pile (2) and a guide structure for guiding the pile core (1) to be lowered into the steel pipe pile (2) are provided near the upper end of the steel pipe pile (2); A grouting connection structure is a connection structure formed by a grouting material filled between a pile core (1) and a steel pipe pile (2) after the pile core (1) is inserted into the steel pipe pile (2).

2. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 1, characterized in that: The first limiting structure comprises a plurality of key grooves (3) on the outer circumferential end surface of the pile core (1); the key grooves (3) are annular grooves recessed in the radial direction, and the plurality of key grooves (3) are arranged at intervals along the axial direction of the pile core (1).

3. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile as claimed in claim 2, characterized in that: The keyway (3) is a trapezoidal keyway with a cross section that is isosceles trapezoidal and is smaller on the side close to the axis of the pile core (1) and larger on the side away from the axis of the pile core (1).

4. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 1, characterized in that: The second limiting structure comprises a plurality of shear keys (4) on the inner end surface of the circumference of the steel pipe pile (2); the shear keys (4) are annular steel bars welded to the inner end surface of the circumference of the steel pipe pile (2), and the plurality of shear keys (4) are arranged at intervals along the axial direction of the steel pipe pile (2).

5. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile as claimed in claim 4, characterized in that: The guide structure comprises a plurality of guide rings (5) arranged on the inner end surface of the circumference of the steel pipe pile (2); the guide ring (5) is a circular ring that surrounds the outer side surface of the circumference of the pile core (1) to restrict the non-axial movement of the pile core (1) when the pile core (1) is inserted into the steel pipe pile (2); the guide ring (5) is fixed to the circumferential side surface of the pile core (1) by a plurality of radially extending connecting ribs (6); and the plurality of guide rings (5) are arranged at intervals along the axial direction.

6. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile as claimed in claim 5, characterized in that: One end of the connecting rib (6) is fixed on the guide ring (5), and the other end is fixed on the shear key (4).

7. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 4, characterized in that: The guide structure comprises a plurality of guide rings (5) arranged on the inner end surface of the circumference of the steel pipe pile (2); the guide ring (5) is a closed annular trumpet-shaped structure with a larger side close to the upper end of the steel pipe pile (2) and a smaller side away from the upper end of the steel pipe pile (2); the guide ring (5) is fixed to the circumferential side surface of the pile core (1) through a plurality of radially extending connecting ribs (6); and the plurality of guide rings (5) are arranged at intervals along the axial direction.

8. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 1, characterized in that: A plurality of T-shaped steel bars (7) are arranged at the upper end of the pile core (1); the small ends of the T-shaped steel bars (7) extend into the concrete of the pile core (1) and are fixedly connected to the main bars of the steel cage of the pile core (1), while the large ends extend along the axial direction of the pile core (1) to the outside of the pile core (1).

9. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 1, characterized in that: A lifting lug (8) is installed on the upper end of the pile core (1).

10. The ultra-high toughness connection structure of a prefabricated pile core and a steel pipe pile according to claim 1, characterized in that: The closed structure comprises a steel plate (9) welded to the inner side of the steel pipe pile (2) and a bottom sealing concrete (10) cast on the steel plate (9).

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