An underwater pile foundation anti-seismic performance improving device

Abstract

The utility model discloses a kind of underwater pile foundation anti-seismic performance promotion devices, it is related to pile foundation technical field;Including reinforcing steel shell, adopt sectional splicing type structure, sleeve and be placed on pile foundation, multiple grouting holes are equipped on the reinforcing steel shell located in the lowermost layer;Positioning fixing device, reinforcing steel shell is fixed on pile foundation, and spacing between reinforcing steel shell and pile foundation can be adjusted during installation process;Stiffening ring, welding in reinforcing steel shell top and bottom, there is mounting hole on stiffening ring, longitudinal adjacent reinforcing steel shell is connected by bolt;Connecting plate, welding in reinforcing steel shell both sides, there is fastening hole on connecting plate, transverse adjacent reinforcing steel shell is connected by bolt;Grouting system, for grout is delivered to grouting area in reinforcing steel shell;The device can avoid causing adverse effect to original bending resistance of pile foundation while promoting pile foundation shear capacity, to meet the demand of anti-seismic reinforcement.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation technology, specifically to a device for improving the seismic performance of underwater pile foundations. Background Technology

[0002] As a crucial load-bearing component of bridge structures, the structural safety of pile foundations directly impacts the overall stability of the bridge. Under seismic loading, insufficient seismic performance of pile foundations can easily lead to bending and shear failure, resulting in overall bridge damage or even collapse. Studies have shown that insufficient shear failure and flexural ductility of pile foundations are the main causes of severe damage. Therefore, improving the shear strength and flexural ductility of pile foundations is key to enhancing the seismic performance of bridges. However, with increasingly stringent seismic requirements for transportation infrastructure, the shear strength and flexural ductility of some existing bridge pile foundations no longer meet current specifications, necessitating reinforcement measures to improve their seismic resistance and ensure the safe operation of bridges.

[0003] Currently, reinforcement technologies for underwater pile foundations are relatively mature. However, for underwater pile foundations of large cross-river and cross-sea bridges, existing reinforcement methods have many limitations due to the complex environment, making it difficult to meet the special needs of underwater construction. For example, the traditional steel casing reinforcement method cannot be transported and installed manually due to the excessive weight of the casing, requiring large hoisting equipment or temporary scaffolding. This not only results in high construction costs but also places high demands on the navigation conditions and working environment of the construction area. In addition, some existing pile foundation reinforcement methods only focus on improving durability, with the casing serving only as an auxiliary structure and failing to fully utilize its load-bearing function. They mainly rely on grouting materials to ensure the reinforcement effect, making it difficult to effectively improve the seismic performance of the pile foundation from a structural perspective.

[0004] More importantly, while some reinforcement methods can improve the flexural bearing capacity of the reinforced area, they may cause the unreinforced area to become a new weak point, failing to meet the requirement of only improving the shear capacity and flexural ductility of the pile foundation. Utility Model Content

[0005] The purpose of this utility model is to provide an underwater pile foundation seismic performance enhancement device, which adopts a multi-section assembled reinforced steel shell, which can be flexibly adjusted according to different reinforcement lengths of the pile foundation, making it convenient for transportation and installation; and while improving the shear resistance of the pile foundation, it can avoid adversely affecting the original bending resistance of the pile foundation, thereby meeting the seismic reinforcement requirements.

[0006] To achieve the above objectives, this application proposes an underwater pile foundation seismic performance enhancement device, comprising:

[0007] The reinforced steel shell adopts a segmented splicing structure and is fitted onto the pile foundation; multiple grouting holes are provided on the bottom layer of the reinforced steel shell;

[0008] The positioning and fixing device fixes the reinforced steel shell to the pile foundation, and the distance between the reinforced steel shell and the pile foundation can be adjusted during the installation process;

[0009] Stiffening rings are welded to the top and bottom of the reinforced steel shell; mounting holes are distributed on the stiffening rings, and vertically adjacent reinforced steel shells are connected by bolts;

[0010] The connecting plate is welded to both sides of the reinforced steel shell, and its height is the same as that of the reinforced steel shell; fastening holes are distributed on the connecting plate, and adjacent reinforced steel shells are connected laterally by bolts;

[0011] The grouting system is used to deliver grout to the grouting zone within the reinforced steel shell; specifically, it includes:

[0012] The main grouting pipe is connected to the grouting pump to ensure continuous and stable delivery of grout;

[0013] The grouting branch pipe is connected to the grouting main pipe through a multi-port connector to achieve simultaneous grouting through multiple channels;

[0014] Valves are installed at the end of each grouting branch pipe to independently control the opening and closing of each grouting point;

[0015] The grouting hole base is welded to the outside of the grouting hole of the lowest layer of reinforced steel shell and is used to connect the grouting system and the reinforced steel shell.

[0016] Connecting pipe port, used to tightly connect the valve and the grouting hole base.

[0017] In one embodiment, multi-channel synchronous grouting is used to form a reinforcement layer between the reinforced steel shell and the pile foundation, so as to achieve structural synergy between the two and jointly bear the shear force on the pile foundation.

[0018] In one embodiment, the positioning and fixing device includes a nut and a positioning and fixing bolt, wherein the nut is welded and fixed at a predetermined position on the outside of the reinforced steel shell and has an internal thread; the positioning and fixing bolt has an external thread that mates with the internal thread of the nut; the positioning and fixing bolt is screwed into the nut through the thread engagement, and its front end extends into the interior of the reinforced steel shell and presses against the surface of the pile foundation, thereby achieving the fixing of the reinforced steel shell and the adjustment of the spacing.

[0019] In one embodiment, the bolts of the stiffening ring are removed after the grouting reinforcement is completed.

[0020] In one embodiment, a transverse sealing gasket is provided at the longitudinally adjacent reinforcing steel shell joint surfaces, the shape of which perfectly matches and tightly fits the stiffening ring.

[0021] In one embodiment, a vertical sealing gasket is provided at the joint surface of the laterally adjacent reinforced steel shells. The shape of the vertical sealing gasket is perfectly matched with the connecting plate and is tightly pressed together.

[0022] In one embodiment, a triangular sealing strip is provided circumferentially at the bottom of the lowest layer of the reinforced steel shell, and the triangular sealing strip fits tightly against the outer surface of the pile foundation.

[0023] In one embodiment, the bottom stiffening ring is bolted to the sealing base plate, which has a 45° inclined bevel on the side where the triangular sealing strip is installed. This bevel matches and fits tightly with the inclined side of the triangular sealing strip, thus achieving a stable installation of the sealing structure.

[0024] In one embodiment, the mounting holes on the stiffening ring are evenly arranged along the circumference, and the center line angle between adjacent mounting holes is 90°.

[0025] In one embodiment, the positioning and fixing devices on each section of the reinforced steel shell are arranged in layers.

[0026] The advantages of the above technical solution adopted in this utility model compared with the prior art are:

[0027] 1. The reinforcement structure with multi-section splicing design can improve the shear strength of the pile foundation while maintaining the original bending performance of the pile foundation, ensuring that the shear bearing capacity and bending ductility of the pile foundation structure meet the seismic design requirements.

[0028] 2. The reinforced steel shell adopts a segmented prefabricated structure, which is particularly suitable for underwater construction environments. It features convenient transportation and flexible installation, and does not require large hoisting equipment, which can improve the efficiency of underwater pile foundation reinforcement operations and reduce construction costs.

[0029] 3. The positioning and fixing bolts can fix the reinforced steel shell to the pile foundation without the need for additional fixing devices such as scaffolding. The construction is simple and the cost is low. In addition, the positioning and fixing bolts can also adjust the distance between the reinforced steel shell and the pile foundation, which makes it convenient to adjust the grouting gap around the pile foundation.

[0030] 4. Multi-channel pressure grouting is adopted, which uses distributed grouting holes and independently controlled valves in conjunction with grouting pumps for pressure grouting. On the one hand, it can ensure that the grout is evenly filled in the gap between the steel shell and the pile foundation, with a wider coverage and denser grouting. On the other hand, closing the valves after grouting can effectively prevent the grout from flowing back and overflowing. Compared with the traditional single-point grouting method, it can significantly improve the construction quality. Attached Figure Description

[0031] Figure 1 A schematic diagram illustrating the application of an underwater pile foundation seismic performance enhancement device;

[0032] Figure 2 Schematic diagram of an underwater pile foundation seismic performance enhancement device;

[0033] Figure 3A schematic diagram of the overall space for reinforcing the steel shell;

[0034] Figure 4 Schematic diagram of the space required to reinforce the steel shell;

[0035] Figure 5 Side view of reinforced steel shell;

[0036] Figure 6 Top view of reinforced steel shell;

[0037] Figure 7 This is a schematic diagram of the sealing base plate.

[0038] The components include: 1. Reinforced steel shell; 2. Positioning and fixing device; 2.1 Nut; 2.2 Positioning and fixing bolt; 3. Stiffening ring; 4. Connecting plate; 5. Grouting system; 5.1 Main grouting pipe; 5.2 Multi-port joint; 5.3 Branch grouting pipe; 5.4 Valve; 5.5 Connecting pipe port; 5.6 Grouting hole base; 6.1 Horizontal sealing gasket; 6.2 Vertical sealing gasket; 6.3 Triangular sealing strip; 6.4 Sealing base plate; 7. Grouting area. Detailed Implementation

[0039] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0041] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] like Figure 1-7 As shown, this embodiment provides an underwater pile foundation seismic performance enhancement device, including a reinforced steel shell 1, a positioning and fixing device 2, a stiffening ring 3, a connecting plate 4, a grouting system 5, and a sealing device;

[0044] The reinforced steel shell 1 adopts a segmented splicing structure, composed of several standard reinforced steel shell units, which are then fitted onto the outside of the pile foundation. This structure allows for flexible adjustment of its height and number of sections according to actual engineering needs. Each reinforced steel shell section consists of two semi-circular parts, which are tightly joined to form a complete circular structure, maintaining consistency with the shape of the pile foundation. Multiple grouting holes are pre-drilled on the bottom reinforced steel shell 1. As a permanent reinforcement structure, after grouting, the reinforced steel shell 1 will form an integral part with the pile foundation to jointly bear shear forces.

[0045] The positioning and fixing device 2 includes a nut 2.1 and a positioning and fixing bolt 2.2. The nut 2.1 is welded to a designated position on the outside of the reinforced steel shell 1 and has internal threads. The positioning and fixing bolt 2.2 is cylindrical and has external threads on its surface that match those of the nut 2.1. During installation, the positioning and fixing bolt 2.2 is screwed into the nut 2.1, with its front end extending into the reinforced steel shell 1 and pressing against the pile foundation. The bolt front end features a tapered tip design, which enhances the fixing effect, prevents the reinforced steel shell 1 from slipping, and reduces damage to the pile foundation surface. Furthermore, the distance between the reinforced steel shell 1 and the pile foundation can be adjusted during installation: by screwing in or out the positioning and fixing bolt 2.2, the gap between the left and right halves of the steel shell and the pile foundation can be precisely controlled to ensure it meets design requirements, thereby guaranteeing the uniformity of the subsequent grouting layer and the stability of the overall structure. Preferably, the positioning and fixing device can be evenly distributed in layers along the circumference, with its position corresponding to the position of the stiffening ring mounting hole.

[0046] The stiffening rings 3 are welded to the top and bottom of the reinforced steel shell 1 to enhance the overall structural integrity. The stiffening rings 3 have pre-drilled mounting holes, allowing for the secure connection of the upper and lower assembly sections using bolts, ensuring that each section of the reinforced steel shell 1 forms a stable whole. Preferably, the stiffening rings 3 have four mounting holes, evenly distributed circumferentially, with a 90° angle between the centerlines of adjacent holes, facilitating staggered connections between the upper and lower assembly sections.

[0047] The connecting plate 4 is welded to the joint between the left and right parts of the reinforced steel shell 1, and is used to connect the left and right semi-circular shells. The height of the connecting plate 4 is consistent with that of the reinforced steel shell 1, and it is provided with bolt holes. By tightening the bolts, the left and right parts can be tightly spliced ​​together to form a complete circular structure, ensuring the load-bearing capacity and overall stability of the reinforced steel shell 1.

[0048] The grouting system 5 includes a main grouting pipe 5.1, a multi-way connector 5.2, grouting branch pipes 5.3, a valve 5.4, a connecting pipe port 5.5, and a grouting hole base 5.6. The grouting hole base 5.6 is welded to the outside of the grouting hole at the bottom of the reinforced steel shell. The connecting pipe port 5.5 is connected to the grouting hole base 5.6. The valve 5.4 is located at the end of the grouting branch pipe 5.3 to control the opening and closing of the grouting hole; it can be closed promptly after grouting is completed. The grouting branch pipe 5.3 is connected to the main grouting pipe 5.1 via the multi-way connector 5.2. This connection method ensures balanced grouting pressure in each branch pipe, preventing uneven grouting due to pressure imbalance. The end of the main grouting pipe 5.1 is connected to a grouting pump above the water surface, providing stable power to the system. The grout is distributed to each branch pipe through the main pipe and multi-way connector according to set parameters, ultimately injecting into the grouting area 7 within the reinforced steel shell 1, resulting in a uniform and reliable grouting effect.

[0049] The sealing device includes a transverse sealing gasket 6.1, a vertical sealing gasket 6.2, a triangular sealing strip 6.3, and a sealing base plate 6.4. The transverse sealing gasket 6.1 is installed at the connection of the stiffening ring 3 to effectively prevent grout leakage from the gap between the assembled sections and ensure stable grouting pressure. The vertical sealing gasket 6.2 is located at the connecting plate 4 to prevent grout leakage along the vertical joint. The triangular sealing strip 6.3 preferably adopts an isosceles right-angled triangle design and is installed at the bottom of the reinforced steel shell 1, working in conjunction with the sealing base plate 6.4. The sealing base plate 6.4 has a circular ring structure with a 45° inclined bevel on the side near the triangular sealing strip 6.3, which fits tightly against the inclined side of the sealing strip to ensure stable installation. The sealing base plate 6.4 has pre-drilled bolt holes corresponding to the stiffening ring 3, which are connected to the bottom stiffening ring 3 of the reinforced steel shell 1 via bolts to form a reliable bottom seal, completely preventing grout leakage.

[0050] The aforementioned device employs multi-channel grouting technology to tightly integrate the reinforced steel shell with the pile foundation, forming an integral structure that jointly bears the shear force. The reinforced steel shell uses a staggered joint connection between upper and lower sections. After reinforcement is completed, the inter-section connecting bolts are removed. This not only improves the shear resistance and flexural ductility of the pile foundation but also ensures that the original bending performance of the pile foundation is not affected.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A device for improving the seismic performance of underwater pile foundations, characterized in that, include: The reinforced steel shell adopts a segmented splicing structure and is fitted onto the pile foundation. Multiple grouting holes are provided on the bottom layer of the reinforced steel shell. The positioning and fixing device fixes the reinforced steel shell to the pile foundation, and the distance between the reinforced steel shell and the pile foundation can be adjusted during the installation process; Stiffening rings are welded to the top and bottom of the reinforced steel shells. Mounting holes are distributed on the stiffening rings, and adjacent vertical reinforced steel shells are connected by bolts. The connecting plate is welded to both sides of the reinforced steel shell, and its height is the same as that of the reinforced steel shell. Fastening holes are distributed on the connecting plate, and adjacent reinforced steel shells are connected laterally by bolts. The grouting system is used to deliver grout to the grouting area inside the reinforced steel shell. Specifically, it includes: a grouting main pipe, which is connected to the grouting pump to ensure continuous and stable delivery of grout; The grouting branch pipe is connected to the grouting main pipe through a multi-port connector to achieve simultaneous grouting through multiple channels; Valves are installed at the end of each grouting branch pipe to independently control the opening and closing of each grouting point; The grouting hole base is welded to the outside of the grouting hole of the lowest layer of reinforced steel shell and is used to connect the grouting system and the reinforced steel shell. Connecting pipe port, used to tightly connect the valve and the grouting hole base.

2. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, Multi-channel synchronous grouting is adopted to form a reinforcement layer between the reinforced steel shell and the pile foundation, so as to achieve structural synergy between the two and jointly bear the shear force of the pile foundation.

3. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, The positioning and fixing device includes a nut and a positioning and fixing bolt. The nut is welded and fixed at a predetermined position on the outside of the reinforced steel shell and has an internal thread. The positioning and fixing bolt has an external thread that matches the internal thread of the nut. The positioning and fixing bolt is screwed into the nut through the threaded engagement, and its front end extends into the interior of the reinforced steel shell and presses against the surface of the pile foundation, thereby achieving the fixing of the reinforced steel shell and the adjustment of the spacing.

4. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, The bolts of the stiffening ring are removed after the grouting reinforcement is completed.

5. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, A transverse sealing gasket is provided at the joint surface of the vertically adjacent reinforced steel shells. The shape of the transverse sealing gasket is perfectly matched and tightly fitted with the stiffening ring.

6. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, A vertical sealing gasket is provided at the joint surface of the horizontally adjacent reinforced steel shells. The shape of the vertical sealing gasket is perfectly matched with the connecting plate and is tightly pressed together.

7. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, A triangular sealing strip is circumferentially installed at the bottom of the lowest layer of the reinforced steel shell, and the triangular sealing strip fits tightly around the outer surface of the pile foundation.

8. The underwater pile foundation seismic performance enhancement device according to claim 7, characterized in that, The bottom stiffening ring is connected to the sealing base plate by bolts. The sealing base plate has a 45° inclined bevel on the side where the triangular sealing strip is installed. This bevel matches and fits tightly with the inclined side of the triangular sealing strip.

9. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, The mounting holes on the stiffening ring are evenly arranged along the circumference, and the included angle between the center lines of adjacent mounting holes is 90°.

10. The underwater pile foundation seismic performance enhancement device according to claim 1, characterized in that, The positioning and fixing devices on each section of the reinforced steel shell are arranged in layers.

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