A bridge caisson foundation

Abstract

The present invention discloses a bridge caisson foundation, which relates to the technical field of bridge caisson foundation protection. The bridge caisson foundation comprises: a caisson foundation body, a first baffle and at least two second baffles, wherein the first baffle is horizontally placed on the riverbed surface in front of the caisson foundation body, and one side end of the first baffle is connected to the water-facing end of the caisson foundation body; at least two second baffles are arranged above the first baffle at a preset distance in the vertical direction, and the same side end of each second baffle is connected to the water-facing end of the caisson foundation body; the length of each second baffle along the water flow direction is less than the length of the first baffle; the length of each second baffle perpendicular to the water flow direction is less than or equal to the length of the first baffle. The bridge caisson foundation of the present invention can actively slow down the local scouring of the bridge caisson foundation by water flow, is easy to maintain, and has low cost.

Description

Technical Field

[0001] The invention relates to the technical field of bridge caisson foundation protection, and in particular to a bridge caisson foundation. Background Art

[0002] At present, after the construction of bridges on natural rivers, local scouring of bridge pier foundations is inevitable. It is generally believed that the local scouring of bridge pier foundations is caused by the horseshoe vortex system around its foundation, and the horseshoe vortex system is caused by the submerged current. Specifically, the causes of local scouring at different positions around the bridge foundation are as follows: the scouring on the front side of the pier is caused by the horseshoe vortex on the front side of the pier; the scouring on both sides of the pier is mainly caused by the accelerated water flow caused by the squeezing of the water flow on both sides and the horseshoe vortex system formed by the horseshoe vortex on the front side of the pier; the scouring on the back side of the pier is mainly caused by the tail horseshoe vortex formed by the horseshoe vortex on both sides of the pier. In summary, the horseshoe vortex on the front side of the pier is the main factor in the local scouring of the bridge pier foundation.

[0003] In the prior art, the protection of local scour of bridge pier foundation usually refers to passive maintenance measures to repair the local scour of bridge pier foundation when the depth of local scour of bridge pier foundation reaches or approaches its designed warning depth, which consumes a lot of materials and has high cost. In addition, as large or extra-large bridge pier foundations at home and abroad mostly adopt large deep-water caisson foundations, their scale is far larger than that of common bridge pier foundations. Traditional maintenance measures will further increase consumables and costs. Summary of the invention

[0004] The embodiment of the present invention provides a bridge caisson foundation to solve the technical problems of using passive maintenance measures in the related art to repair local scour of the bridge caisson foundation, large material consumption and high cost.

[0005] The present invention provides a bridge caisson foundation, comprising:

[0006] Caisson foundation body;

[0007] A first baffle plate is horizontally placed on the riverbed surface in front of the caisson foundation body, and one side end of the first baffle plate is connected to the water-facing end of the caisson foundation body;

[0008] At least two second baffles are arranged above the first baffle at a preset distance in the vertical direction, and the same side end of each second baffle is connected to the water-facing end of the caisson foundation body; the length of each second baffle along the water flow direction is less than the length of the first baffle; the width of each second baffle perpendicular to the water flow direction is less than or equal to the width of the first baffle.

[0009] In some embodiments, the first baffle is equipped with a first screw, and a through hole is provided in the middle of the first baffle along the direction of water flow; one end of the first screw is fixed to the water-facing end of the caisson foundation body, and the other end is used to pass through the through hole, and the first baffle is connected to the water-facing end of the caisson foundation body by tightening the nut.

[0010] In some embodiments, each second baffle is equipped with a second screw, and each second baffle is provided with a threaded hole in the middle along the water flow direction; one end of each second screw is fixed on the water-facing end of the caisson foundation body, and the other end is used for threaded connection with the threaded hole of the corresponding second baffle, and the corresponding second baffle is connected to the water-facing end of the caisson foundation body by tightening the nut.

[0011] In some embodiments, both sides of the first baffle and each of the second baffles along the water flow direction are bent upward by 10° to 15°.

[0012] In some embodiments, the caisson foundation body is rectangular in the middle along the water flow direction and has semicircular structures at both ends. The length of the first baffle along the water flow direction is not less than 0.3 times the diameter of the semicircular structure of the caisson foundation body, and the width perpendicular to the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body.

[0013] In some embodiments, the length of each of the second baffles along the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body, and the width perpendicular to the water flow direction is not less than 0.05 times the diameter of the semicircular structure of the caisson foundation body.

[0014] In some embodiments, the thickness of the first baffle and each of the second baffles is not less than 0.01 times the diameter of the semicircular structure of the caisson foundation body.

[0015] In some embodiments, the number of the second baffles is four.

[0016] In some embodiments, the first baffle and the second baffle are both made of steel plates.

[0017] In some embodiments, the first baffle and the second baffle are both made of polyethylene composite materials.

[0018] The beneficial effects brought about by the technical solution provided by the present invention include:

[0019] The embodiment of the present invention provides a bridge caisson foundation. Since a first baffle is arranged on the riverbed surface in front of the caisson foundation body, and a plurality of second baffles are arranged above the first baffle at a preset distance in the vertical direction, the plurality of second baffles can reduce the flow velocity intensity of the submerged current in front of the caisson foundation body, thereby weakening the horseshoe vortex formed by the submerged current; at the same time, the length of each second baffle is less than the length of the first baffle, and the width of each second baffle is less than or equal to the width of the first baffle. Even if the weakened submerged current forms a horseshoe vortex in front of the second baffle, the horseshoe vortex can be minimized to the extent of being blocked by the first baffle. Therefore, the present invention can actively slow down the local scouring of the bridge caisson foundation by water flow, and the first baffle and the second baffle have simple structures, are easy to maintain, and have low costs, and have good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the structure of a bridge caisson foundation provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a bridge caisson foundation subjected to water flow provided by an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a first baffle provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of a second baffle provided in an embodiment of the present invention;

[0025] In the figure: 1. first baffle; 2. second baffle; 3. first screw rod; 4. second screw rod; 5. caisson foundation body. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The embodiment of the present invention provides a bridge caisson foundation, which can solve the technical problems in the prior art of using passive maintenance measures to repair local scour of the bridge caisson foundation, resulting in large material consumption and high cost.

[0028] See also Figure 1 As shown, a bridge caisson foundation comprises: a caisson foundation body 5, a first baffle 1 and at least two second baffles 2. The caisson foundation body 5 has many shapes, such as square, circular, etc. The embodiment of the present invention takes the caisson foundation body 5 with a rectangular middle and semicircular structures at both ends along the water flow direction as an example for explanation.

[0029] The first baffle 1 is placed horizontally on the riverbed surface in front of the caisson foundation body 5, and one side end of the first baffle 1 is connected to the water-facing end of the caisson foundation body 5. At least two second baffles 2 are arranged above the first baffle 1 at a preset distance in the vertical direction, and the same side end of each second baffle 2 is connected to the water-facing end of the caisson foundation body 5. The length of each second baffle 2 along the water flow direction is less than the length of the first baffle 1, and the width of each second baffle 2 perpendicular to the water flow direction is not greater than the width of the first baffle 1. In the bridge caisson foundation in the embodiment of the present invention, the number of second baffles 2 is four. Specifically, the second baffle 2 is set below half the water depth, and the specific spacing is determined according to the actual water depth. The spacing between adjacent second baffles 2 cannot be less than 1 / 2 of the width perpendicular to the water flow direction.

[0030] The working principle of the bridge caisson foundation in the embodiment of the present invention is as follows:

[0031] See also Figure 1 and Figure 2 As shown in the figure, when the bridge caisson foundation encounters water flow impact, its different layers of water flow will form two water flows with equal momentum along the wall at the water-facing end of the caisson foundation body. Under the combined action of each layer of water flow, the maximum downward flow velocity will be formed near the riverbed surface near the front side of the bridge caisson foundation. The flow velocity intensity is closely related to the strength of the horseshoe vortex system around the bridge caisson foundation.

[0032] Under the action of several first baffles 1, the submerged current formed by the water flow of different layers is hindered and weakened by the first baffles 1. According to the principle of conservation of momentum, the water flow may move left and right and front and back from the impact point. Among them, the left and right water flows move to the sides of the bridge pier respectively; at the same time, the front and back water flows (moving to the front or back of the bridge caisson foundation) can be ignored compared with the water flows moving to the left and right sides due to the obstruction near the bridge caisson foundation and the top impact of the incoming water flow.

[0033] At the same time, a second baffle 2 is arranged on the riverbed surface, and the length of each second baffle 2 along the water flow direction is less than the length of the first baffle 1; and the width of each second baffle 2 perpendicular to the water flow direction is not greater than the width of the first baffle 1. The second baffle 2 basically covers the movement range of the horseshoe vortex formed by the reduced submerged current, which can reduce the local scouring of the horseshoe vortex on the foundation of the bridge caisson.

[0034] Compared with the prior art, the bridge caisson foundation in the embodiment of the present invention has a first baffle 1 arranged on the riverbed surface in front of the caisson foundation body 5, and a plurality of second baffles are arranged above the first baffle 1 at a preset distance in the vertical direction. The plurality of second baffles can reduce the flow velocity intensity of the submerged current in front of the caisson foundation body, thereby weakening the horseshoe vortex formed by the submerged current; at the same time, the length of each second baffle 2 is less than the length of the first baffle 1, and the width of each second baffle 2 is less than or equal to the width of the first baffle 1. Even if the weakened submerged current forms a horseshoe vortex in front of the second baffle 2, the horseshoe vortex can be blocked by the first baffle 1 to minimize the local scouring of the bridge caisson foundation. Therefore, the present invention can actively slow down the local scouring of the bridge caisson foundation by water flow, and the first baffle 1 and the second baffle 2 have simple structures, are easy to maintain, and have low costs, and have good economic benefits.

[0035] As an alternative embodiment, see Figure 3 As shown, the first baffle plate 1 is equipped with a first screw rod 3, and a through hole is provided in the middle of the first baffle plate 1 along the water flow direction. One end of the first screw rod 3 is fixed to the semicircular structure of the water-facing end of the caisson foundation body 5, and the other end is used to pass through the through hole and connect the first baffle plate 1 with the semicircular structure of the water-facing end of the caisson foundation body 5 by tightening a nut.

[0036] As an alternative embodiment, see Figure 4 As shown, each second baffle plate 2 is equipped with a second screw rod 4, and a threaded hole is provided in the middle of each second baffle plate 2 along the water flow direction. One end of each second screw rod 4 is fixed to the semicircular structure at the water-facing end of the caisson foundation body 5, and the other end is used to be threadedly connected to the threaded hole of the corresponding second baffle plate 2, and the corresponding second baffle plate 2 is connected to the semicircular structure at the water-facing end of the caisson foundation body 5 by tightening the nut.

[0037] As an optional embodiment, the first baffle 1 and each second baffle 2 are bent upward by 10° to 15° on both sides along the water flow direction. On the one hand, the first baffle 1 and each second baffle 2 are bent upward by a certain angle on both sides along the water flow direction to form a wrapping shape, which is conducive to reducing the flow velocity of the submerged current; on the other hand, the left and right water flows of the first baffle 1 and each second baffle 2 will move to the upper layer, which is also conducive to reducing the flow velocity of the submerged current, reducing the horseshoe vortex effect, and reducing the scouring of the riverbed by the water flow.

[0038] As an optional embodiment, the length of the first baffle 1 along the water flow direction is not less than 0.3 times the diameter of the semicircular structure of the caisson foundation body 5, and the width perpendicular to the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body 5. Further, the length of each second baffle 2 along the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body 5, and the width perpendicular to the water flow direction is not less than 0.05 times the diameter of the semicircular structure of the caisson foundation body 5. Furthermore, the thickness of the first baffle 1 and each second baffle 2 is not less than 0.01 times the diameter of the semicircular structure of the caisson foundation body 5.

[0039] Assuming that the diameter of the semicircular structure of the caisson foundation body 5 is D, the short side b of the rectangular structure of the caisson foundation body 5 is D, and the long side a is c*D, where c>0. The length of the first baffle 1 along the water flow direction is not less than 0.3D, and the width perpendicular to the water flow direction is not less than 0.2D. The length of each second baffle 2 along the water flow direction is not less than 0.2D, and the width perpendicular to the water flow direction is not less than 0.2D. The length of the first baffle 1 along the water flow direction is not less than 0.3D, basically covering the movement range of the horseshoe vortex. The thickness of the first baffle 1 and each second baffle 2 is not less than 0.01D.

[0040] As an optional implementation, the first baffle 1 and the second baffle 2 are both made of steel plates, which have high strength, are easy to process, and have low cost. If the first baffle 1 and the second baffle 2 are damaged, they can be easily replaced, which can reduce the maintenance difficulty and use cost of the bridge caisson foundation.

[0041] As an optional embodiment, the first baffle 1 and the second baffle 2 are both made of polyethylene composite materials. The polyethylene composite materials are resistant to corrosion by acid, alkali, and salt aqueous solutions, are lightweight, and have low cost. If the first baffle 1 and the second baffle 2 are damaged, they can be easily replaced, thereby reducing the maintenance difficulty and use cost of the bridge caisson foundation.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0044] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A bridge caisson foundation, characterized in that: include: Caisson foundation body (5); A first baffle (1) is horizontally placed on the riverbed surface in front of the caisson foundation body (5), and one side end of the first baffle (1) is connected to the water-facing end of the caisson foundation body (5); At least two second baffles (2) are arranged above the first baffle (1) at a preset distance in the vertical direction, and the same side end of each second baffle (2) is connected to the water-facing end of the caisson foundation body (5); the length of each second baffle (2) in the water flow direction is shorter than the length of the first baffle (1); The width of each of the second baffles (2) perpendicular to the water flow direction is less than or equal to the width of the first baffle (1); Both sides of the first baffle (1) and each of the second baffles (2) along the water flow direction are bent upward by 10° to 15°; The caisson foundation body (5) is rectangular in the middle along the water flow direction and semicircular in both ends; the length of the first baffle plate (1) along the water flow direction is not less than 0.3 times the diameter of the semicircular structure of the caisson foundation body (5), and the width perpendicular to the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body (5); the length of each of the second baffle plates (2) along the water flow direction is not less than 0.2 times the diameter of the semicircular structure of the caisson foundation body (5), and the width perpendicular to the water flow direction is not less than 0.05 times the diameter of the semicircular structure of the caisson foundation body (5).

2. A bridge caisson foundation as claimed in claim 1, characterized in that: The first baffle plate (1) is provided with a first screw rod (3), and a through hole is provided in the middle of the first baffle plate (1) along the direction of water flow; one end of the first screw rod (3) is fixed to the water-facing end of the caisson foundation body (5), and the other end is used to pass through the through hole and connect the first baffle plate (1) to the water-facing end of the caisson foundation body (5) by tightening a nut.

3. A bridge caisson foundation as claimed in claim 1, characterized in that: Each of the second baffle plates (2) is provided with a second screw rod (4), and a threaded hole is provided in the middle of each of the second baffle plates (2) along the direction of water flow; one end of each of the second screw rods (4) is fixed to the water-facing end of the caisson foundation body (5), and the other end is used for threaded connection with the threaded hole of the corresponding second baffle plate (2), and the corresponding second baffle plate (2) is connected to the water-facing end of the caisson foundation body (5) by tightening a nut.

4. A bridge caisson foundation as claimed in claim 1, characterized in that: The thickness of the first baffle (1) and each of the second baffles (2) is not less than 0.01 times the diameter of the semicircular structure of the caisson foundation body (5).

5. The bridge caisson foundation according to claim 1, characterized in that: The number of the second baffles (2) is four.

6. The bridge caisson foundation according to claim 1, characterized in that: The first baffle (1) and the second baffle (2) are both made of steel plates.

7. The bridge caisson foundation according to claim 1, characterized in that: The first baffle (1) and the second baffle (2) are both made of polyethylene composite materials.

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