A connection structure between prefabricated piles and caps and its installation construction method

Abstract

The present invention relates to the field of building construction technology, and specifically to a connection structure between a precast pile and a pedestal, comprising a locking assembly, a connecting rib and a limiting end ring, wherein the locking assembly comprises a connector disposed in the inner cavity of the precast pile, and a positioning member disposed at the top of the connector, the positioning member being fixedly connected to the top of the precast pile, the connector comprising an abutment portion, the bottom end of the connecting rib being fixedly connected to the positioning member, the limiting end ring being disposed at the top of the casting cavity, the top end of the connecting rib being fixedly connected to the limiting end ring after passing through the abutment end ring, and the present invention locks one end of the connecting rib to the upper portion of the precast pile through the locking assembly, and arranges the other end of the connecting rib on the top of the pedestal through the limiting end ring, and after pouring concrete into the casting cavity of the pedestal through the inner hole of the limiting end ring, the locking assembly can stably connect the bottom end of the connecting rib to the precast pile, making the operation more convenient. The present invention also relates to an installation and construction method for a connection structure between a precast pile and a pedestal.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a connection structure between a prefabricated pile and a cap, and also to an installation and construction method of the connection structure between the prefabricated pile and the cap. Background Art

[0002] The pier cap is a reinforced concrete platform connected to the top of each pile, which is used to bear and distribute the load transmitted by the pier body. It bears the load of the upper power tower and transmits it to the foundation piles, distributing the load to the foundation piles. When there are multiple pile foundations under the pier cap, the pier cap can distribute the load more evenly to each pile body, so that the piles are under balanced force.

[0003] Traditionally, precast hollow concrete piles are connected to the foundation by inserting a steel cage into the pile and pouring concrete into the core. The friction between the core-filled concrete and the pile's sidewalls acts as a tensile force for the upper foundation. This traditional connection method is susceptible to site conditions and the quality of the construction personnel during construction. It is difficult to ensure the density of the concrete when pouring the concrete core inside the pile. After construction, the friction between the core-filled concrete and the pile wall is difficult to measure, which can easily lead to quality problems. Over decades of service, the core-filled concrete will age and loosen, inevitably losing friction with the pile wall and causing significant building safety issues.

[0004] Chinese patent CN203701125U discloses a connection structure between a precast pile and a cap, and a pile driver for the same. The connection structure includes a precast pile and a cap. The precast pile is embedded with tensile reinforcement bars, the lower end of which is embedded in the precast pile and fixed to the pile's stirrups. The top of the precast pile is connected to the cap, and the upper end of the tensile reinforcement bars is located within the cap. The lower end of the tensile reinforcement bars and the precast pile body are integrally formed by pouring concrete to produce a finished precast pile. The upper end of the tensile reinforcement bars is retained above the pile head of the finished precast pile. The upper end of the tensile reinforcement bars is fixed to the cap by pouring concrete, forming a permanent, integrated structure between the precast pile and the cap.

[0005] The precast pile and the pedestal are connected by tensile steel bars, and the tensile steel bars at the joints between the precast pile and the pedestal are very easy to break. At the same time, because the tensile steel bars are straight rods, the two ends of the tensile steel bars are very easy to detach from the precast pile or the pedestal. Summary of the Invention

[0006] In response to the above problems, a connection structure between a precast pile and a pedestal is provided, in which one end of the connecting reinforcement is locked to the upper part of the precast pile by a locking assembly, and the other end of the connecting reinforcement is set on the top of the pedestal by a limiting end ring. After concrete is poured into the casting cavity of the pedestal through the inner hole of the limiting end ring, the locking assembly can stably connect the bottom end of the connecting reinforcement to the precast pile, which makes the operation more convenient and solves the problem that the connection structure at the junction of the existing pedestal and precast pile is easily damaged.

[0007] The locking mechanism comprises a locking mechanism, wherein the locking mechanism comprises a locking mechanism comprising a first locking mechanism disposed in the inner cavity of the precast pile and a positioning mechanism disposed at the top of the locking mechanism, the positioning mechanism being fixedly connected to the top of the precast pile, the positioning mechanism comprising a second locking mechanism comprising a second locking mechanism comprising a first locking mechanism and a second locking mechanism.

[0008] Preferably, the connector includes an insert cylinder, an abutment block and a sliding column, the positioning member is arranged at the top end of the insert cylinder, the insert cylinder is inserted in the precast pile, the circumferential surface of the insert cylinder is provided with a sliding groove extending radially thereof, the inner diameter of the abutment block has a driving inclined surface, the sliding column is coaxially slidingly arranged in the insert cylinder, the circumferential surface of the sliding column is provided with a driving inclined groove, the driving inclined groove is slidably matched with the driving inclined surface, and when the sliding column moves downward in the insert cylinder, the abutment block radially abuts against the inner cavity of the precast pile.

[0009] Preferably, the positioning member includes a positioning ring integrally formed with the plug-in tube, and the top of the prefabricated pile is provided with a main reinforcement passing through its pile body. The main reinforcement passes through the positioning ring and is fixedly connected to it, and the bottom end of the connecting reinforcement passes through the positioning ring and is fixedly connected to it.

[0010] Preferably, the driving inclined surface is provided with a limiting inclined block extending along its oblique direction, and the driving inclined groove is provided with a limiting inclined groove extending along its oblique direction, and the limiting inclined groove is in sliding engagement with the limiting inclined block.

[0011] Preferably, the connection structure also includes positioning end rings arranged at both ends of the precast pile, the inner diameter of the positioning end ring is smaller than the inner diameter of the precast pile, the inner circumferential surface of the positioning end ring is provided with an extension portion arranged along the circumferential direction, the extension portion is located at the top of the abutment block, and an avoidance groove for avoiding the bottom of the connecting rib is formed between adjacent extension portions. When the abutment block is located in the driving inclined groove, the maximum distance between the outer side of the abutment block and the axis of the plug-in cylinder is smaller than the inner radius of the positioning end ring.

[0012] Preferably, the connecting mechanism also includes a first limiting ring, a second limiting ring and an abutment seat, the first limiting ring and the second limiting ring are coaxially arranged at the bottom end of the connecting rib, the first limiting ring is located in the avoidance groove, the second limiting ring is located at the bottom of the positioning end ring, the abutment seat has a horizontal section arranged on the connecting rib, the horizontal section is located between the first limiting ring and the second limiting ring, and the two ends of the horizontal section have elastic sections that are bent upward and abut against the bottom of the extension part.

[0013] Preferably, the limiting end ring is provided with connecting holes arranged along its circumference, the top end of the connecting rib passes through the connecting hole and is fixedly connected thereto, and the connecting structure also includes a third limiting ring, which is coaxially arranged on the top of the connecting rib and abuts against the top end of the connecting end ring.

[0014] Preferably, the connecting structure also includes a center rib, an expansion piece and a contraction piece. The bottom end of the center rib passes through the sliding column and is fixedly connected to it. The expansion piece and the contraction piece are arranged on the center rib in sequence from bottom to top. The expansion piece has a first connection part that can bend the connecting rib radially outward, and the contraction piece has a second connection part that can bend the connecting rib radially inward. When the center rib moves downward, the first connection part bends radially outward to the connecting rib connected to it, and the second connection part bends radially inward to the connecting rib connected to it.

[0015] Preferably, the expansion member includes a first fixing ring, a first connecting ring, a first cylinder, a first plug rod and a first spring, the first fixing ring is coaxially fixedly arranged on the center rib, the first connecting ring is arranged on the connecting rib, the first fixing ring is higher than the first connecting ring, one end of the first cylinder is rotatably connected to the first connecting ring, one end of the first plug rod is rotatably connected to the first fixing ring, the other end of the first plug rod passes through the other end of the first cylinder and slides with it, and the first spring is arranged between the inner end of the first cylinder and the inner end of the first plug rod; the contraction member includes a second fixing ring, a second connecting ring, a second cylinder, a second plug rod and a second spring, the second fixing ring is coaxially fixedly arranged on the center rib, the second connecting ring is arranged on the connecting rib, the second fixing ring is lower than the second connecting ring, one end of the second cylinder is rotatably connected to the second connecting ring, one end of the second plug rod is rotatably connected to the second fixing ring, the other end of the second plug rod passes through the other end of the second cylinder and slides with it, and the second spring is arranged between the inner end of the second cylinder close to the second fixing ring and the inner end of the second plug rod.

[0016] A method for installing and constructing a connection structure between a precast pile and a cap, applied to a connection structure between a precast pile and a cap as claimed in any one of claims 1 to 4, comprising the following steps:

[0017] Step 1: Fix the bottom end of the connecting rib to the top end of the precast pile through a locking assembly;

[0018] Step 2: Hang the prefabricated cap so that the connecting ribs pass through the casting cavity of the prefabricated cap, and place the limiting end ring on the top of the casting cavity and fix it to the connecting ribs;

[0019] Step three: pour concrete into the casting cavity through the inner hole of the limiting end ring, and complete the connection between the precast pile and the precast foundation after the concrete solidifies.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention locks one end of the connecting reinforcement with the upper part of the precast pile through a locking assembly, and sets the other end of the connecting reinforcement on the top of the pedestal through a limiting end ring. After pouring concrete into the casting cavity of the pedestal through the inner hole of the limiting end ring, the locking assembly can stably connect the bottom end of the connecting reinforcement with the precast pile, which makes the operation more convenient and solves the problem that the connection structure at the junction of the existing pedestal and the precast pile is easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a three-dimensional cross-sectional view of a connection structure of a precast pile and a cap when the precast pile and the cap are connected.

[0023] Figure 2 The invention discloses a cross-sectional view of a connection structure between a precast pile and a cap when the precast pile and the cap are connected.

[0024] Figure 3 yes Figure 2 A partial enlarged view of point A.

[0025] Figure 4 It is a three-dimensional diagram of the connection structure between precast piles and caps.

[0026] Figure 5 It is an axial cross-sectional view of the connection structure between a precast pile and a cap.

[0027] Figure 6 It is a three-dimensional exploded diagram of the connection structure between precast piles and foundation piles from the first perspective.

[0028] Figure 7 It is a three-dimensional exploded diagram of the connection structure between precast piles and foundation piles from a second perspective.

[0029] Figure 8 It is a three-dimensional exploded view of the locking components in the connection structure of precast piles and foundation piles.

[0030] Figure 9 It is a three-dimensional diagram of the expansion and contraction parts in the connection structure of precast piles and foundation piles.

[0031] Figure 10 It is a three-dimensional exploded view of the expansion and contraction parts in the connection structure of precast piles and foundation piles.

[0032] The numbers in the figure are: 1-precast pile; 11-main reinforcement; 2-precast cap; 31-connector; 311-connector tube; 312-abutment block; 3121-limiting inclined block; 313-sliding column; 3131-limiting inclined groove; 32-positioning member; 321-positioning ring; 4-connecting reinforcement; 5-limiting end ring; 51-connecting hole; 6-positioning end ring; 61-extension part; 62-avoidance groove; 71-first limiting ring ;72-second limiting ring;73-abutment seat;74-third limiting ring;81-center rib;82-expansion piece;821-first fixing ring;822-first connecting ring;823-first cylinder;824-first plug rod;825-first spring;83-contraction piece;831-second fixing ring;832-second connecting ring;833-second cylinder;834-second plug rod;835-second spring. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides:

[0035] The locking assembly comprises a plug-in component 31 provided in the inner cavity of the precast pile 1 and a positioning component 32 provided at the top end of the plug-in component 31. The positioning component 32 is fixedly connected to the top end of the precast pile 1. The plug-in component 31 has an abutment portion that can radially abut the inner cavity of the precast pile 1. The bottom end of the connecting rib 4 is fixedly connected to the positioning component 32. The top end of the connecting rib 4 passes through the casting cavity of the precast cap 2. When casting in the casting cavity, the abutment portion radially abuts against the inner cavity of the precast pile 1. The limiting end ring 5 is provided at the top end of the casting cavity. The outer diameter of the limiting end ring 5 is larger than the diameter of the casting cavity. The top end of the connecting rib 4 passes through the abutment end ring and is fixedly connected to the limiting end ring 5. When casting, the casting cavity is cast through the inner hole of the limiting end ring 5.

[0036] During construction, the bottom end of the connecting rib 4 is fixedly connected to the positioning piece 32 in advance, and then the connector 31 of the locking assembly is inserted into the top of the precast pile 1, so that the positioning piece 32 abuts against the top of the precast pile 1, and the positioning piece 32 is fixedly connected to the top of the precast pile 1. The precast foundation 2 is hoisted, and the casting cavity of the precast foundation 2 is aligned with the top end of the connecting rib 4. The precast foundation 2 is slowly released so that the top end of the connecting rib 4 passes through the casting cavity until the foundation is placed in the corresponding position. The bottom end of the casting cavity is in a trumpet shape that gradually expands from top to bottom, so as to facilitate the positioning of the precast pile 1 and the connecting rib 4 and the casting cavity. The top end of the connecting rib 4 is gradually inserted into the casting cavity under the action of the trumpet slope, thereby improving construction efficiency and accuracy.

[0037] After the foundation is placed, the limiting end ring 5 is placed at the top of the casting cavity, so that the top of the connecting rib 4 passes through the limiting end ring 5 and is fixedly connected to it, and concrete is injected into the casting cavity through the inner hole of the limiting end ring 5. During the gradual injection of concrete, the connector 31 is locked with the inner cavity of the precast pile 1, so that the bottom end of the connecting rib 4 is stably connected to the precast pile 1.

[0038] In this embodiment, one end of the connecting rib 4 is locked to the upper part of the precast pile 1 through a locking assembly, and the other end of the connecting rib 4 is set on the top of the pedestal through a limiting end ring 5. After concrete is poured into the casting cavity of the pedestal through the inner hole of the limiting end ring 5, the locking assembly can stably connect the bottom end of the connecting rib 4 to the precast pile 1, which makes the operation more convenient and solves the problem that the connection structure at the junction of the existing pedestal and the precast pile 1 is easily damaged.

[0039] like Figure 3 As shown, the connector 31 includes an inserting tube 311, an abutment block 312 and a sliding column 313. The positioning member 32 is arranged at the top end of the inserting tube 311. The inserting tube 311 is inserted into the precast pile 1. The circumferential surface of the inserting tube 311 is provided with a sliding groove extending along its radial direction. The inner diameter of the abutment block 312 has a driving inclined surface. The sliding column 313 is coaxially slidingly arranged in the inserting tube 311. The circumferential surface of the sliding column 313 is provided with a driving inclined groove. The driving inclined groove slides with the driving inclined surface. When the sliding column 313 moves downward in the inserting tube 311, the abutment block 312 radially abuts against the inner cavity of the precast pile 1.

[0040] After the insertion tube 311 is inserted into the precast pile 1, the positioning piece 32 abuts against the top of the precast pile 1, and the positioning piece 32 is fixedly connected to the precast pile 1. Before pouring concrete, the abutment block 312 is located in the driving inclined groove, so that the insertion tube 311 can be inserted into the precast pile 1. After pouring concrete, the sliding column 313 gradually slides downward relative to the insertion tube 311 under the action of concrete accumulation on its top, and the driving inclined surface slides in cooperation with the driving inclined groove, so that when the sliding column 313 slides downward, the abutment block 312 abuts against the inner wall of the precast pile 1 along the radial direction of the insertion tube 311. At the same time, after the concrete solidifies, the position of the sliding column 313 relative to the insertion tube 311 is locked, so that the abutment column abuts against the inner wall of the precast pile 1 with a constant pressure, thereby stably connecting the precast pile 1 and the connecting rib 4.

[0041] like Figure 3 As shown, the positioning member 32 includes a positioning ring 321 integrally formed with the plug-in tube 311, and the top of the precast pile 1 is provided with a main reinforcement 11 passing through its pile body. The main reinforcement 11 passes through the positioning ring 321 and is fixedly connected to it. The bottom end of the connecting reinforcement 4 passes through the positioning ring 321 and is fixedly connected to it.

[0042] The positioning ring 321 is coaxially arranged on the top of the plug-in tube 311. The positioning ring 321 and the plug-in tube 311 are integrally formed to improve the rigid connection force. The precast pile 1 is supported by stirrups and main bars 11 as a skeleton. The top of the main bar 11 is higher than the top of the precast pile 1, so that the top of the main bar 11 passes through the positioning ring 321, and then the main bar 11 and the positioning ring 321 are welded to the positioning ring 321, so that the positioning ring 321 and the precast pile 1 can be stably connected. At the same time, the bottom end of the connecting bar 4 is passed through the positioning ring 321 and then connected to it, so that the precast pile 1 and the connecting bar 4 can be stably connected.

[0043] like Figure 8 As shown, the driving inclined surface is provided with a limiting inclined block 3121 extending along its oblique direction, and the driving inclined groove is provided with a limiting inclined groove 3131 extending along its oblique direction, and the limiting inclined groove 3131 is slidably matched with the limiting inclined block 3121.

[0044] By providing a limiting bevel block 3121 extending obliquely along the driving inclined surface, and providing a limiting bevel groove 3131 extending obliquely along the driving inclined groove, the limiting bevel block 3121 and the limiting bevel groove 3131 are slidably matched, so that before the insertion tube 311 is inserted into the prefabricated pile 1, the abutment block 312 can always be located in the driving inclined groove, thereby facilitating the installation of the insertion tube 311.

[0045] like Figure 6As shown, the connection structure also includes positioning end rings 6 arranged at both ends of the precast pile 1, the inner diameter of the positioning end ring 6 is smaller than the inner diameter of the precast pile 1, and the inner circumferential surface of the positioning end ring 6 is provided with an extension portion 61 arranged along the circumferential direction, and the extension portion 61 is located at the top of the abutment block 312, and an avoidance groove 62 for avoiding the bottom of the connecting rib 4 is formed between adjacent extension portions 61. When the abutment block 312 is located in the driving inclined groove, the maximum distance between the outer side of the abutment block 312 and the axis of the plug-in tube 311 is smaller than the inner radius of the positioning end ring 6.

[0046] The positioning end ring 6 is coaxially arranged at both ends of the precast pile 1, so that the positioning end ring 6 stably connects the precast pile 1 and the positioning piece 32. Because the inner periphery of the positioning end ring 6 is provided with an extension portion 61 extending along its radial direction, and the extension portion 61 is located at the top of the abutment block 312, when the abutment block 312 is located in the driving inclined groove, the plug-in piece 31 can be inserted into the precast pile 1, and at the same time, the extension portion 61 can form an axial limit for the abutment block 312 along the plug-in tube 311, thereby preventing the abutment block 312 and the plug-in tube 311 from detaching from the precast pile 1.

[0047] After passing through the positioning piece 32 , the bottom end of the connecting rib 4 can be located in the avoidance groove 62 , thereby avoiding the formation of a gap between the positioning piece 32 and the positioning end ring 6 , and further improving the connection stability between the connecting rib 4 and the precast pile 1 .

[0048] like Figure 6 and Figure 7 As shown, the connecting mechanism also includes a first limiting ring 71, a second limiting ring 72 and an abutment seat 73. The first limiting ring 71 and the second limiting ring 72 are coaxially arranged at the bottom end of the connecting rib 4. The first limiting ring 71 is located in the avoidance groove 62, and the second limiting ring 72 is located at the bottom of the positioning end ring 6. The abutment seat 73 has a horizontal section that is sleeved on the connecting rib 4. The horizontal section is located between the first limiting ring 71 and the second limiting ring 72. The two ends of the horizontal section have elastic sections that are bent upward and abut against the bottom of the extension portion 61.

[0049] By coaxially welding the first limiting ring 71 and the second limiting ring 72 to the top of the connecting rib 4, the first limiting ring 71 can be located in the avoidance groove 62, and the abutment seat 73 is arranged between the first limiting ring 71 and the second limiting ring 72, so that the elastic sections on both sides of the abutment seat 73 are bent when passing through the avoidance groove 62, and when the elastic sections pass through the avoidance groove 62, the elastic sections can abut against the bottom end of the extension part 61, thereby stably locking the connecting rib 4 and the positioning piece 32.

[0050] like Figure 4 and Figure 6As shown, the limiting end ring 5 is provided with connecting holes 51 arranged along its circumference, and the top end of the connecting rib 4 passes through the connecting hole 51 and is fixedly connected thereto. The connection structure also includes a third limiting ring 74, which is coaxially arranged on the top of the connecting rib 4 and abuts against the top end of the connecting end ring.

[0051] By providing connection holes 51 arranged along the circumference of the limiting end ring 5, the top end of the connecting rib 4 passes through the connection hole 51 and is connected to the third limiting ring 74, thereby ensuring that the connecting rib 4 is evenly arranged in the casting cavity. After the casting is completed, the evenly distributed connecting ribs 4 can form a stable tensile structure.

[0052] like Figure 4 As shown, the connection structure also includes a center rib 81, an expansion piece 82 and a contraction piece 83. The bottom end of the center rib 81 passes through the sliding column 313 and is fixedly connected to it. The expansion piece 82 and the contraction piece 83 are arranged on the center rib 81 in sequence from bottom to top. The expansion piece 82 has a first connection part that can bend the connecting rib 4 radially outward, and the contraction piece 83 has a second connection part that can bend the connecting rib 4 radially inward. When the center rib 81 moves downward, the first connection part bends radially outward to the connecting rib 4 connected to it, and the second connection part bends radially inward to the connecting rib 4 connected to it.

[0053] By passing the bottom end of the central rib 81 through the sliding column 313 and fixedly connected thereto, the expansion piece 82 and the contraction piece 83 are arranged on the central rib 81 and connected to the connecting rib 4, so that during pouring, the sliding column 313 drives the central rib 81 to move downward, so that the connecting rib 4 connected to the expansion piece 82 bends radially outward, and the connecting rib 4 connected to the contraction piece 83 bends radially inward, so that the connecting rib 4 has an inward or outward stress extending in the horizontal direction. Therefore, after the concrete is poured, the concrete in the pouring cavity has a stress extending in the horizontal direction, so that the base and the concrete column therein can be stably connected.

[0054] like Figure 5 、 Figure 9 and Figure 10As shown, the expansion member 82 includes a first fixing ring 821, a first connecting ring 822, a first cylinder 823, a first plug rod 824 and a first spring 825. The first fixing ring 821 is coaxially fixedly arranged on the central rib 81, the first connecting ring 822 is arranged on the connecting rib 4, the first fixing ring 821 is higher than the first connecting ring 822, one end of the first cylinder 823 is rotatably connected to the first connecting ring 822, one end of the first plug rod 824 is rotatably connected to the first fixing ring 821, the other end of the first plug rod 824 passes through the other end of the first cylinder 823 and is slidably engaged therewith, and the first spring 825 is arranged between the inner end of the first cylinder 823 and the inner end of the first plug rod 824;

[0055] The contraction member 83 includes a second fixing ring 831, a second connecting ring 832, a second cylinder 833, a second plug rod 834 and a second spring 835. The second fixing ring 831 is coaxially fixedly arranged on the center rib 81, the second connecting ring 832 is arranged on the connecting rib 4, the second fixing ring 831 is lower than the second connecting ring 832, one end of the second cylinder 833 is rotatably connected to the second connecting ring 832, one end of the second plug rod 834 is rotatably connected to the second fixing ring 831, the other end of the second plug rod 834 passes through the other end of the second cylinder 833 and slides with it, and the second spring 835 is arranged between the inner end of the second cylinder 833 close to the second fixing ring 831 and the inner end of the second plug rod 834.

[0056] The sliding column 313 drives the central rib 81 to move downward, so that the first fixing ring 821 and the second fixing ring 831 move downward in the casting cavity, so that the first plug rod 824 moves in the first cylinder 823, and the second plug rod 834 moves in the second cylinder 833. Under the action of the first spring 825 and the second spring 835, the first cylinder 823 drives the connecting rib 4 connected to it to bend radially outward through the first connecting ring 822, and the second cylinder 833 drives the connecting rib 4 connected to it to bend radially inward through the second connecting ring 832, so that the connecting rib 4 has stress inward or outward in the horizontal direction, so that the concrete in the base can be stably connected to the base.

[0057] A method for installing and constructing a connection structure between a precast pile and a cap, applied to a connection structure between a precast pile and a cap as claimed in any one of claims 1 to 4, is characterized in that it comprises the following steps:

[0058] Step 1: After the bottom end of the pre-connecting rib 4 passes through the positioning piece 32, the first limiting ring 71 and the second limiting ring 72 are coaxially welded to the bottom end of the connecting rib 4. Then, the bottom end of the connecting rib 4 is fixedly connected to the top end of the precast pile 1 through the locking assembly. During this process, the plug-in is inserted into the precast pile 1, and then the main rib 11 is passed through the positioning piece 32 and welded to it.

[0059] Step 2: Hang the prefabricated cap 2 so that the connecting rib 4 passes through the casting cavity of the prefabricated cap 2, and set the limiting end ring 5 at the top of the casting cavity and fixedly connect it to the connecting rib 4;

[0060] Step three: pour concrete into the casting cavity through the inner hole of the limiting end ring 5, and complete the connection between the precast pile 1 and the precast foundation 2 after the concrete solidifies.

[0061] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A connection structure between a prefabricated pile and a cap, used to connect a prefabricated pile (1) and a prefabricated cap (2), characterized in that: The connection structure comprises a locking assembly, a connecting rib (4) and a limiting end ring (5), wherein the locking assembly comprises a plug-in connector (31) arranged in the inner cavity of the precast pile (1), and a positioning member (32) arranged at the top end of the plug-in connector (31), wherein the positioning member (32) is fixedly connected to the top end of the precast pile (1), and the plug-in connector (31) comprises an abutting portion which can abut against the inner cavity of the precast pile (1) in the radial direction, and the bottom end of the connecting rib (4) is fixedly connected to the positioning member (32), and the top end of the connecting rib (4) passes through the casting cavity of the precast foundation (2). When casting is carried out in the casting cavity, the abutting portion abuts against the inner cavity of the precast pile (1) in the radial direction, and the limiting end ring (5) is arranged at the top end of the casting cavity, and the outer diameter of the limiting end ring (5) is larger than the diameter of the casting cavity. The top end of the connecting rib (4) passes through the limiting end ring (5) and is fixed to the limiting end ring (5). When pouring, pouring is performed into the pouring cavity through the inner hole of the limiting end ring (5); the plug-in component (31) includes a plug-in cylinder (311), an abutment block (312) and a sliding column (313); the positioning component (32) is arranged at the top end of the plug-in cylinder (311); the plug-in cylinder (311) is plugged into the precast pile (1); a sliding groove extending radially is provided on the circumferential surface of the plug-in cylinder (311); the inner diameter of the abutment block (312) has a driving inclined surface; the sliding column (313) is coaxially slidably arranged in the plug-in cylinder (311); a driving inclined groove is provided on the circumferential surface of the sliding column (313); the driving inclined groove and the driving inclined surface are slidably matched; when the sliding column (313) moves downward in the plug-in cylinder (311), the abutment block (312) abuts against the inner cavity of the precast pile (1) in the radial direction; The connection structure further comprises positioning end rings (6) arranged at both ends of the precast pile (1), the inner diameter of the positioning end ring (6) being smaller than the inner diameter of the precast pile (1), the inner circumferential surface of the positioning end ring (6) being provided with extensions (61) arranged along the circumferential direction, the extensions (61) being located at the top of the abutment blocks (312), and avoidance grooves (62) for avoiding the bottom of the connecting rib (4) being formed between adjacent extensions (61), and when the abutment blocks (312) are located in the driving inclined groove, the maximum distance between the outer side of the abutment blocks (312) and the axis of the plug-in tube (311) is smaller than the inner radius of the positioning end ring (6).

2. The connection structure between a precast pile and a cap according to claim 1, characterized in that: The positioning member (32) includes a positioning ring (321) integrally formed with the plug-in tube (311); the top end of the prefabricated pile (1) is provided with a main reinforcement (11) passing through the pile body; the main reinforcement (11) passes through the positioning ring (321) and is fixedly connected thereto; the bottom end of the connecting reinforcement (4) passes through the positioning ring (321) and is fixedly connected thereto.

3. The connection structure between a precast pile and a cap according to claim 1, characterized in that: The driving inclined surface is provided with a limiting inclined block (3121) extending in an oblique direction thereof, and the driving inclined groove is provided with a limiting inclined groove (3131) extending in an oblique direction thereof, wherein the limiting inclined groove (3131) is in sliding engagement with the limiting inclined block (3121).

4. The connection structure between a precast pile and a cap according to claim 1, characterized in that: The connecting mechanism further comprises a first limiting ring (71), a second limiting ring (72) and an abutting seat (73), wherein the first limiting ring (71) and the second limiting ring (72) are coaxially arranged at the bottom end of the connecting rib (4), the first limiting ring (71) is located in the avoidance groove (62), the second limiting ring (72) is located at the bottom of the positioning end ring (6), and the abutting seat (73) has a horizontal section sleeved on the connecting rib (4), the horizontal section is located between the first limiting ring (71) and the second limiting ring (72), and both ends of the horizontal section have elastic sections that are bent upward and abut against the bottom of the extension portion (61).

5. The connection structure between a precast pile and a cap according to claim 1, characterized in that: The limiting end ring (5) is provided with connection holes (51) arranged along its circumference, and the top end of the connecting rib (4) passes through the connection hole (51) and is fixedly connected thereto. The connection structure also includes a third limiting ring (74), which is coaxially arranged on the top of the connecting rib (4) and abuts against the top end of the limiting end ring (5).

6. The connection structure between a precast pile and a cap according to claim 1, characterized in that: The connection structure further includes a central rib (81), an expansion piece (82) and a contraction piece (83), wherein the bottom end of the central rib (81) passes through the sliding column (313) and is fixedly connected thereto, and the expansion piece (82) and the contraction piece (83) are sequentially arranged on the central rib (81) from bottom to top, wherein the expansion piece (82) has a first connection portion capable of bending the connecting rib (4) radially outward, and the contraction piece (83) has a second connection portion capable of bending the connecting rib (4) radially inward, and when the central rib (81) moves downward, the first connection portion bends radially outward toward the connecting rib (4) connected thereto, and the second connection portion bends radially inward toward the connecting rib (4) connected thereto.

7. The connection structure between a precast pile and a cap according to claim 6, characterized in that: The expansion member (82) includes a first fixing ring (821), a first connecting ring (822), a first cylinder (823), a first plug rod (824) and a first spring (825), wherein the first fixing ring (821) is coaxially fixedly arranged on the central rib (81), the first connecting ring (822) is arranged on the connecting rib (4), the first fixing ring (821) is higher than the first connecting ring (822), one end of the first cylinder (823) is rotatably connected to the first connecting ring (822), one end of the first plug rod (824) is rotatably connected to the first fixing ring (821), the other end of the first plug rod (824) passes through the other end of the first cylinder (823) and is slidably engaged therewith, and the first spring (825) is arranged between the inner end of the first cylinder (823) and the inner end of the first plug rod (824); The contraction member (83) includes a second fixing ring (831), a second connecting ring (832), a second cylinder (833), a second plug rod (834) and a second spring (835). The second fixing ring (831) is coaxially fixedly arranged on the central rib (81), the second connecting ring (832) is arranged on the connecting rib (4), the second fixing ring (831) is lower than the second connecting ring (832), one end of the second cylinder (833) is rotatably connected to the second connecting ring (832), one end of the second plug rod (834) is rotatably connected to the second fixing ring (831), the other end of the second plug rod (834) passes through the other end of the second cylinder (833) and is slidably engaged therewith, and the second spring (835) is arranged between the inner end of the second cylinder (833) close to the second fixing ring (831) and the inner end of the second plug rod (834).

8. A method for installing and constructing a connection structure between a precast pile and a cap, applied to a connection structure between a precast pile and a cap as claimed in any one of claims 1 to 3, characterized in that: The following steps are included: Step 1: fix the bottom end of the connecting rib (4) to the top end of the prefabricated pile (1) through a locking assembly; Step 2: suspend the prefabricated foundation (2) so that the connecting rib (4) passes through the casting cavity of the prefabricated foundation (2), and set the limiting end ring (5) at the top of the casting cavity and fixedly connect it to the connecting rib (4); Step three: pour concrete into the casting cavity through the inner hole of the limiting end ring (5), and complete the connection between the prefabricated pile (1) and the prefabricated foundation (2) after the concrete solidifies.

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