Prefabricated round-end hollow pier column connection construction device adopting shallow socket UHPC (Ultra High Performance Concrete) connection

Abstract

The invention relates to the technical field of pier construction, and particularly discloses a shallow socket UHPC (Ultra High Performance Concrete) connected prefabricated round-end hollow pier column connection construction device which comprises a hollow pier column and a foundation, a socket cup opening is formed in the foundation, the hollow pier column can be inserted into the socket cup opening, UHPC is injected into a gap between the socket cup opening and the hollow pier column, and the socket cup opening is connected with the hollow pier column. And after the UHPC is solidified, a UHPC reinforcing block is formed, the bottom of the inner side of the hollow pier column is provided with an exhaust hole penetrating through the hollow pier column, and an exhaust valve is installed in the exhaust hole. The UHPC reinforcing block has the beneficial effects that air in the UHPC is exhausted through the exhaust valve, the situation that bubbles exist in the UHPC reinforcing block, and consequently the connection strength between the hollow pier column and the foundation is affected is prevented, when the UHPC is injected, the first reinforcing steel bars, the second reinforcing steel bars, the reinforcing rings and the reinforcing rods form a whole to serve as an internal reinforcing framework of the UHPC reinforcing block, and therefore the UHPC reinforcing block is prevented from being damaged. Therefore, the connection strength of the hollow pier column and the foundation is improved.

Description

Technical Field

[0001] This invention relates to the field of bridge pier construction technology, and in particular to a construction device for connecting precast round-end hollow pier columns with shallow-sleeve UHPC connections. Background Technology

[0002] In bridge engineering, elevated roads, and building structures, circular hollow piers are widely used due to their excellent aerodynamic performance, good bending and torsional stiffness, and relatively material-saving characteristics. With the rapid development of industrialized construction, prefabrication and assembly technology has become an important development direction in modern bridge construction due to its advantages such as fast construction speed, less on-site wet work, less environmental impact, and easier control of project quality.

[0003] In the assembly and connection of precast piers, the performance of the connection nodes directly determines the reliability, durability, and seismic performance of the overall structure. Currently, common precast pier connection methods include grouting sleeve connections, grout-anchored lap connections, and socket connections. Among these, socket connections are widely used in pier-to-foundation connections due to their ease of construction and clear force distribution. Traditional socket connections typically involve inserting the pier into a pre-reserved deep socket in the foundation, followed by pouring ordinary concrete or grout into the socket. Traditional socket connections require a large insertion depth (usually 1.0 to 1.5 times the pier diameter), resulting in a large foundation size, increased excavation volume, and significantly increased use of foundation concrete and steel reinforcement, thus increasing project costs and resource consumption. To overcome these problems, the industry has begun to explore shallow socket connection technology. Its core concept is to optimize the foundation structure by reducing the insertion depth, but this places extremely stringent requirements on the performance of the connection materials. Ultra-high performance concrete (UHPC) offers an ideal material solution for shallow socket joints due to its ultra-high strength (compressive strength exceeding 150 MPa), high toughness, excellent durability, and strong bonding properties. UHPC enables efficient and reliable force transfer between the pier and precast column within sockets much shallower than traditional methods. However, when using UHPC for filling, air can easily become trapped in the concrete as it is poured into the gap between the pier and the socket. This trapped air is difficult to expel, leading to voids and uneven density in the UHPC reinforcement block after solidification, thus affecting the connection strength between the pier and the foundation. Furthermore, in existing technologies, reinforcement is typically only placed at the lower end of the pier and within the socket, without transverse reinforcement between the reinforcement bars. Therefore, the UHPC reinforcement block formed after concrete pouring has poor shear resistance, indirectly affecting the connection strength between the pier and the foundation. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a construction device for connecting prefabricated round-end hollow pier columns with shallow socket UHPC connections.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A precast round-end hollow pier connection construction device for shallow socket UHPC connection includes a hollow pier and a foundation. A socket is provided on the foundation, into which the hollow pier can be inserted. UHPC concrete is injected into the gap between the socket and the hollow pier. After the UHPC concrete solidifies, it forms a UHPC reinforcement block. An exhaust hole penetrating the hollow pier is provided on the bottom inner side of the hollow pier. An exhaust valve is installed in the exhaust hole. When injecting UHPC concrete, the exhaust valve is used to expel air from the UHPC concrete to prevent defects such as voids and uneven density in the UHPC reinforcement block, thus avoiding affecting the connection strength between the hollow pier and the foundation.

[0006] Preferably, the exhaust valve is equipped with multiple reinforcing rods, each with a reinforcing ring at one end. The lower end of the hollow pier is provided with multiple first reinforcing bars, and the socket is provided with multiple second reinforcing bars. After the hollow pier is inserted into the socket, the first and second reinforcing bars are located within the reinforcing rings. When UHPC concrete is injected, the first and second reinforcing bars, the reinforcing rings, and the reinforcing rods form a whole, serving as the internal reinforcing skeleton of the UHPC reinforcement block, thereby improving the connection strength between the hollow pier and the foundation.

[0007] Preferably, one end of the reinforcing rod is provided with a sliding hole, and the insert rod is slidably connected in the sliding hole. A hydraulic cylinder is installed in the sliding hole, and the hydraulic cylinder is used to drive the insert rod to slide in the sliding hole. The first reinforcing bar is provided with a first insertion hole, and the second reinforcing bar is provided with a second insertion hole. After the hollow pier is inserted into the socket, the insert rod extends outward and passes through the first insertion hole and the second insertion hole in sequence.

[0008] Preferably, one end of the insertion rod is fixedly connected to two clamping rods, and the reinforcing ring has two clamping holes on one side. The clamping holes and clamping rods are arranged in a one-to-one correspondence and the clamping rods can be inserted into the clamping holes. One side of the clamping rod has a first inclined surface, and the side of the clamping hole has a second inclined surface. When the clamping rod is inserted into the clamping hole, under the action of the first inclined surface and the second inclined surface, the clamping rod expands and deforms outward, thereby fixing the clamping rod in the second insertion hole.

[0009] Preferably, the exhaust valve includes a barrel body, which is fixed to the inner wall of the exhaust port. A piston plate is slidably connected inside the barrel body, and a spring is fixedly connected between the piston plate and the bottom of the inner side of the barrel body. The bottom of the barrel body is provided with a clearance hole, and the piston plate is provided with multiple mounting holes. Reinforcing rods pass through the mounting holes one by one and are fixed inside the mounting holes. All reinforcing rods pass through the clearance holes. A vent hole is provided on the piston plate, and the upper end of the vent hole is rotatably connected to the sealing cover through a spring hinge.

[0010] The beneficial effects of the present invention are as follows: The precast round-end hollow pier column connection construction device provided by the present invention uses an exhaust valve to expel air from the UHPC concrete, preventing air bubbles in the UHPC reinforcement block from affecting the connection strength between the hollow pier column and the foundation. When injecting UHPC concrete, the first steel bar, the second steel bar, the reinforcement ring and the reinforcement rod form a whole, which acts as the internal reinforcing skeleton of the UHPC reinforcement block, thereby improving the connection strength between the hollow pier column and the foundation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the basic structure of a prefabricated round-end hollow pier column connection construction device for shallow socket UHPC connection provided by the present invention. Figure 2 This is a schematic diagram of the basic structure of a hollow pier column; Figure 3 yes Figure 2 The main view; Figure 4 yes Figure 3 Enlarged view of point A; Figure 5 This is a structural diagram showing the connection between the hollow pier and the foundation. Figure 6 This is a schematic diagram of the basic structure of the foundation; Figure 7 This is a diagram showing the connection structure between the reinforcing rod and the reinforcing ring; Figure 8 yes Figure 7 Enlarged view of N points; Figure 9 This is a schematic diagram of the basic structure of the construction auxiliary equipment; Figure 10 This is a schematic diagram of the basic structure of the clamping device. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0013] like Figures 1-10As shown in this embodiment, a precast round-end hollow pier column connection construction device with shallow socket UHPC connection includes a hollow pier 2 and a foundation 3. A socket 31 is provided on the foundation 3, into which the hollow pier 2 can be inserted. Multiple first reinforcing bars 22 are provided at the lower end of the hollow pier 2, and multiple second reinforcing bars 32 are provided inside the socket 31. UHPC concrete is injected into the gap between the socket 31 and the hollow pier 2. After the UHPC concrete solidifies, a UHPC reinforcement block 9 is formed. The first and second reinforcing bars 22 act as a reinforcing skeleton, improving the strength of the UHPC reinforcement block 9. An exhaust hole 21 penetrating the hollow pier 2 is provided on the inner bottom of the hollow pier 2. An exhaust valve 4 is installed inside the exhaust hole 21. When injecting UHPC concrete, the exhaust valve 4 is used to expel air from the UHPC concrete, preventing air bubbles from remaining inside the UHPC reinforcement block 9 and affecting the connection strength between the hollow pier 2 and the foundation 3.

[0014] In a preferred embodiment of the present invention, a plurality of reinforcing rods 5 are installed on the exhaust valve 4, and a reinforcing ring 6 is installed at one end of each reinforcing rod 5. After the hollow pier 2 is inserted into the socket 31, the first reinforcing bar 22 and the second reinforcing bar 32 are both located inside the reinforcing ring 6. When UHPC concrete is injected, the first reinforcing bar 22, the second reinforcing bar 32, the reinforcing ring 6 and the reinforcing rod 5 form a whole, which acts as the internal reinforcing skeleton of the UHPC reinforcing block 9, thereby further improving the connection strength between the hollow pier 2 and the foundation 3.

[0015] To further enhance the connection strength between the hollow pier 2 and the foundation 3, a sliding hole 51 is provided at one end of the reinforcing rod 5. An insert rod 52 is slidably connected within the sliding hole 51. A hydraulic cylinder 50 is installed inside the sliding hole 51. The hydraulic cylinder 50 has a built-in small hydraulic station and can be remotely controlled. The hydraulic cylinder 50 is for single use only and remains permanently in the sliding hole 51 after completing the pushing task. The hydraulic cylinder 50 drives the insert rod 52 to slide within the sliding hole 51. A first insertion hole is provided on the first reinforcing bar 22, and a second insertion hole is provided on the second reinforcing bar 32. After the hollow pier 2 is inserted into the socket 31, the insert rod 52 extends outward and passes through the first and second insertion holes in sequence. This arrangement allows the first reinforcing bar 22, the second reinforcing bar 32, the reinforcing rod 5, and the reinforcing ring 6 to be connected and fixed together in a horizontal series by the horizontally arranged insert rod 52, so that the first reinforcing bar 22, the second reinforcing bar 32, the reinforcing rod 5, and the reinforcing ring 6 form an integral structure, which serves as the internal reinforcing skeleton of the UHPC reinforcing block 9, thereby further improving the connection strength between the hollow pier column 2 and the foundation 3.

[0016] To ensure a secure connection between the first reinforcing bar 22, the second reinforcing bar 32, and the insertion rod 52, in this embodiment, two clamping rods 53 are fixedly connected to one end of the insertion rod 52. Two clamping holes 61 are provided on one side of the reinforcing ring 6, with each clamping hole 61 corresponding to a clamping rod 53, allowing the clamping rod 53 to be inserted into the clamping hole 61. A first inclined surface is provided on one side of the clamping rod 53, and a second inclined surface is provided on one side of the clamping hole 61. When the clamping rod 53 is inserted into the clamping hole 61, under the action of the first and second inclined surfaces, the clamping rod 53 expands outward, increasing the gap between the clamping rods 53. This allows the clamping rod 53 to fully contact the inner wall of the second insertion hole, thus securing the insertion rod 52 very securely within the second insertion hole.

[0017] In a preferred embodiment of the present invention, in order to expel the air mixed in the UHPC concrete during the pouring process, the exhaust valve 4 is designed as follows: the exhaust valve 4 includes a barrel 41, which is fixed to the inner wall of the exhaust hole 21. A piston plate 42 is slidably connected inside the barrel 41. A spring 43 is fixedly connected between the piston plate 42 and the bottom of the inner side of the barrel 41. A clearance hole 40 is provided at the bottom of the barrel 41. A plurality of mounting holes are provided on the piston plate 42. Reinforcing rods 5 pass through the mounting holes one by one and are fixed in the mounting holes. All reinforcing rods 5 pass through the clearance holes 40. A vent hole is provided on the piston plate 42. The upper end of the vent hole is rotatably connected to the sealing cover 44 through a spring hinge. When the spring hinge is in a free state, the sealing cover 44 is in contact with the piston plate 42, thereby sealing the vent hole. During use, the hollow pier column 2 is hoisted using a hoisting device (not shown in the attached drawing). After concrete pouring, the hollow pier column 2 moves up and down within the socket 31. During this up-and-down movement, the reinforcing ring 6 also moves up and down, thus achieving the vibration effect of the reinforcing ring 6 on the concrete. Additionally, as the hollow pier column 2 moves downward, when the reinforcing ring 6 contacts the concrete, it generates an upward thrust on the reinforcing rod 5. Under this thrust, the piston plate 42 also moves upward. During this upward movement, the piston plate 42 generates suction on the concrete, drawing away any air mixed in. Then, under the tension of the spring 43, the piston plate 42 moves downward and returns to its original position. During this downward movement, the pressure on the lower side of the piston plate 42 is greater than the pressure on the upper side. This pressure difference causes the sealing cover 44 to rotate upward, opening the vent and releasing air. To prevent air bubbles inside the UHPC reinforcement block 9 from affecting the connection strength between the hollow pier 2 and the foundation 3.

[0018] In a preferred embodiment of the present invention, during the hoisting process of the hoisting device on the hollow pier 2, in order to facilitate the positioning and guidance of the hollow pier 2, a mobile construction auxiliary device 1 is also provided in this embodiment. (See attached image) Figure 9and Figure 10 The construction auxiliary device 1 includes a mobile vehicle 11, with an arc-shaped beam 12 fixedly connected to one side of the mobile vehicle 11. At least three clamping devices 12 and at least two detection devices are mounted on the arc-shaped beam 12. Each detection device includes a column 14, and each column 14 has at least two sensors 15 mounted on one side. Two sensors 15 from the multiple detection devices are used to detect whether the hollow pier column 2 is tilted. The clamping device 12 includes a vertical plate 131 fixed to the upper side of the arc-shaped beam 12. A vertical groove 132 is provided on one side of the vertical plate 131, and a slider 133 is slidably connected within the vertical groove 132. A first electric telescopic rod 134 is mounted on the top of the vertical plate 131, which drives the slider 133 to slide up and down along the vertical groove 132. A second electric telescopic rod 135 is mounted on one side of the slider 133, and the telescopic end of the second electric telescopic rod 135 is fixedly connected to an arc-shaped clamping plate 136. During use, after the position of the hollow pier 2 is determined, the construction auxiliary device 1 is moved to make the arc beam 12 coaxial with the hollow pier 2. The second electric telescopic rod 135 pushes the arc clamp 136 into contact with the hollow pier 2, and the hollow pier 2 is positioned by multiple arc clamps 136. During construction, two sensors 15 from multiple detection devices are used to detect whether the hollow pier 2 is tilted. If tilting is found, the second electric telescopic rod 135 pushes the arc clamp 136 to clamp the hollow pier 2. Then, the first electric telescopic rod 134 drives the slider 133 to slide up and down along the vertical groove 132, thereby adjusting the tilt direction of the hollow pier 2 and ensuring that the position of the hollow pier 2 is accurate.

Claims

1. A construction device for connecting precast hollow pier columns with shallow socket UHPC connections, comprising a hollow pier column (2) and a foundation (3), wherein the foundation (3) is provided with a socket (31), the hollow pier column (2) can be inserted into the socket (31), UHPC concrete is injected into the gap between the socket (31) and the hollow pier column (2), and after the UHPC concrete solidifies, a UHPC reinforcement block (9) is formed, characterized in that: The hollow pier (2) has an exhaust hole (21) that penetrates through the hollow pier (2) at the bottom of its inner side. The exhaust hole (21) is equipped with an exhaust valve (4). When UHPC concrete is injected, the exhaust valve (4) is used to expel the air in the UHPC concrete to prevent air bubbles from being present in the UHPC reinforcement block (9) and affecting the connection strength between the hollow pier (2) and the foundation (3).

2. The construction device for connecting prefabricated hollow pier columns with shallow socket UHPC connections according to claim 1, characterized in that: The exhaust valve (4) is equipped with multiple reinforcing rods (5), and each reinforcing rod (5) is equipped with a reinforcing ring (6) at one end. The lower end of the hollow pier (2) is provided with multiple first reinforcing bars (22), and the socket (31) is provided with multiple second reinforcing bars (32). After the hollow pier (2) is inserted into the socket (31), the first reinforcing bars (22) and the second reinforcing bars (32) are both located in the reinforcing ring (6). When UHPC concrete is injected, the first reinforcing bars (22), the second reinforcing bars (32), the reinforcing ring (6) and the reinforcing rods (5) form a whole, which serves as the internal reinforcing skeleton of the UHPC reinforcing block (9), thereby improving the connection strength between the hollow pier (2) and the foundation (3).

3. The construction device for connecting prefabricated hollow pier columns with shallow socket UHPC connections according to claim 2, characterized in that: The reinforcing rod (5) has a sliding hole (51) at one end, and the insert rod (52) is slidably connected in the sliding hole (51). The sliding hole (51) is equipped with a hydraulic cylinder (50), which is used to drive the insert rod (52) to slide in the sliding hole (51). The first reinforcing bar (22) has a first insertion hole, and the second reinforcing bar (32) has a second insertion hole. After the hollow pier (2) is inserted into the socket (31), the insert rod (52) extends outward and passes through the first insertion hole and the second insertion hole in sequence.

4. The construction device for connecting prefabricated hollow pier columns with shallow socket UHPC connections according to claim 3, characterized in that: Two clamping rods (53) are fixedly connected to one end of the insertion rod (52). Two clamping holes (61) are provided on one side of the reinforcing ring (6). The clamping holes (61) and the clamping rods (53) are arranged in a one-to-one correspondence and the clamping rods (53) can be inserted into the clamping holes (61). A first inclined surface is provided on one side of the clamping rod (53) and a second inclined surface is provided on one side of the clamping hole (61). When the clamping rod (53) is inserted into the clamping hole (61), under the action of the first inclined surface and the second inclined surface, the clamping rod (53) expands and deforms outward, thereby fixing the clamping rod (53) in the second insertion hole.

5. The construction device for connecting prefabricated hollow pier columns with shallow socket UHPC connections according to claim 2, characterized in that: The exhaust valve (4) includes a barrel (41), which is fixed to the inner wall of the exhaust hole (21). A piston plate (42) is slidably connected inside the barrel (41). A spring (43) is fixedly connected between the piston plate (42) and the bottom of the inner side of the barrel (41). A clearance hole (40) is provided at the bottom of the barrel (41). A plurality of mounting holes are provided on the piston plate (42). The reinforcing rods (5) pass through the mounting holes one by one and are fixed in the mounting holes. The reinforcing rods (5) all pass through the clearance holes (40). A vent hole is provided on the piston plate (42). The upper end of the vent hole is rotatably connected to the sealing cover (44) through a spring hinge.

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