CN216999884U - Protection device for be used for weakening local scour of pier foundation - Google Patents
Protection device for be used for weakening local scour of pier foundation Download PDFInfo
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- CN216999884U CN216999884U CN202220741532.0U CN202220741532U CN216999884U CN 216999884 U CN216999884 U CN 216999884U CN 202220741532 U CN202220741532 U CN 202220741532U CN 216999884 U CN216999884 U CN 216999884U
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Abstract
The utility model provides a protective device for weakening local scouring of a pier foundation, which is simple in structure, convenient in construction and material taking and low in cost and can effectively weaken local scouring of the pier foundation. The device comprises a water-permeable turbulent flow pile, wherein the water-permeable turbulent flow pile is arranged at the upstream of a pier to be protected; wherein, the vortex stake of permeating water adopts hollow structure, and the vortex stake internal packing that permeates water has the filler, has evenly seted up a plurality of side seams on the lateral wall of the vortex stake of permeating water. The lateral wall of the turbulence pile that permeates water has been seted up the side joint and has been made it have the water permeability, when blockking the incoming flow, allow partial rivers to pass the turbulence pile that permeates water through the gap, make rivers reduce greatly for traditional solid sacrificial pile to the loading effect of the turbulence pile that permeates water, it is lower to the intensity and the stability requirement of basis, the turbulence pile intussuseption that permeates water is filled with the filler, make its inside structural style complicated, flow path is tortuous more, the turbulence effect is stronger, can effectively reduce the local of the preceding rivers velocity of flow of mound and decline rivers to pier foundation and erode.
Description
Technical Field
The utility model relates to the technical field of bridge protection engineering, in particular to a protection device for weakening local scouring of a pier foundation.
Background
The bridge plays a very important role in promoting economic development and communication among various regions. The piers of a large part of bridges are in a turbulent river, and local scouring and riverbed undercutting phenomena around the pier foundation can be caused due to the interaction of river water, silt and the piers, so that the exposure of a pile foundation is reduced, and the inclination of a pile body can be caused in serious conditions to further influence the overall stability of the bridge. From the structure of present bridge, local scour is the condition that can't avoid, consequently increases the protection dynamics that the pier scour, reduces its impaired degree just becomes the key in order to ensure bridge structure stability safety.
The water flow structure around the bridge comprises forward-downward water flow of the pier, forward surge and backward vortex. Compared with the river bottom flow velocity, the flow velocity at the upper part is faster, and horseshoe-shaped vortexes around the bridge piers are formed. Negative pressure appears in the center of each vortex which rotates rapidly and moves downstream, silt in a riverbed is sucked up and carried downstream, and the silt is deposited at the downstream of the pier, so that a long sand ridge is formed. At present, measures for weakening local scour of the bridge pier are mainly divided into active protective measures and passive protective measures. Active protection measures are based on weakening the erosive power of the downwash and horseshoe vortices, such as expanding pile foundations, bridge pier slots, ring wing retainers, sacrificial piles arranged upstream of bridge piers, and the like. Passive protection measures are started by improving the erosion resistance of the river bed, such as paving particle protection materials around the pier foundation to form a protective layer, riprap protection and the like.
The pier front sacrificial pile protection is suitable for a bed surface with stable water flow conditions, and has the characteristics of simple structure, convenient construction and obvious protection effect. The active protection mode of the sacrificial pile is used for preventing scouring, although a certain effect is achieved, because the design standard of the sacrificial pile is not high and the foundation burial depth is not enough, the underwater current in front of the sacrificial pile erodes the river bed around the sacrificial pile, so that the local scouring of the sacrificial pile is serious, even the sacrificial pile inclines or collapses, in the flood season, the water level of the river in the mountain area rises rapidly, the height of the pile body is reduced relative to the water level, the protection effect of the sacrificial pile is reduced, and the protection effect is failed.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides the protective device for weakening the local scouring of the pier foundation, which has the advantages of simple structure, convenient construction and material taking and low cost, and can effectively weaken the local scouring of the pier foundation.
The utility model is realized by the following technical scheme:
a protection device for weakening local scouring of a pier foundation comprises a water-permeable turbulent flow pile, wherein the water-permeable turbulent flow pile is arranged at the upstream of a pier to be protected;
wherein, the vortex stake of permeating water adopts hollow structure, and the inside packing of the vortex stake of permeating water has the filler, has evenly seted up a plurality of side seams on the lateral wall of the vortex stake of permeating water.
Preferably, the top end of the water-permeable turbulent flow pile is provided with a preformed hole.
Preferably, the cross section of the water and flow permeating and disturbing pile is circular, oval or polygonal.
Preferably, when the cross section of the water-permeable turbulent flow pile is circular, the ratio of the wall thickness of the water-permeable turbulent flow pile to the diameter of the water-permeable turbulent flow pile is 0.1-0.3.
Preferably, when the cross section of the water-permeable turbulent flow pile is circular, the ratio of the diameter of the water-permeable turbulent flow pile to the diameter of the pier to be protected is 0.4-1.0.
Preferably, the center distance between the water-permeable turbulent flow pile and the pier to be protected is 2-5 times of the diameter of the pier to be protected.
Preferably, the width of the side seam is smaller than the particle size of the filler.
Preferably, the width of the side seam is 0.5 times of the wall thickness of the water-permeable and turbulent flow pile.
Preferably, the water-permeable turbulent flow pile is formed by splicing a plurality of prefabricated sections, a mortise grouting hole is reserved at the top of each prefabricated section, and adjacent prefabricated sections are fixedly connected with the mortise grouting holes through tenons.
Preferably, the filler inside the water-permeable turbulent flow pile is broken stone.
Compared with other prior art, the utility model has the following beneficial technical effects:
according to the protection device for weakening local scouring of the pier foundation, the water-permeable turbulent flow pile is arranged at the upstream of the pier to be protected, the side wall of the water-permeable turbulent flow pile is provided with the side seam to enable the water-permeable turbulent flow pile to have water permeability, incoming flow is blocked, meanwhile, a part of water flow is allowed to pass through the water-permeable turbulent flow pile through the seam, the load effect of the water flow on the water-permeable turbulent flow pile is greatly reduced compared with that of a traditional solid sacrificial pile, the requirements on the strength and the stability of the foundation are lower compared with that of the solid sacrificial pile, the water-permeable turbulent flow pile is filled with fillers, the internal structure is complex, the flow path is more tortuous, the turbulent flow effect is stronger, and the flow velocity of water flow in front of a pier and the local scouring of the pier foundation caused by the falling water flow can be effectively reduced. Meanwhile, the structural design of the utility model can disturb water flow in a turbulent flow area formed between the water-permeable turbulent flow pile and the pier to be protected, reduce the water flow velocity and sand carrying capacity of the turbulent flow area, reduce the scouring effect of the submerged water flow and enable silt carried by the water flow to be deposited in front of the pier so as to further reduce the local scouring of the pier.
The utility model has the further improvement that the top end of the water-permeable turbulent flow pile is provided with a reserved hole, the height of the protection device can be adjusted according to the height of the water surface, and a precast pile can be additionally arranged through the top reserved mortise grouting hole in the flood season, so that the protection height is increased, and the protection effect cannot be reduced due to the rising of the water level. And its weight is lighter, and the transportation is convenient, does not need too complicated construction equipment and more construction number, design benefit, novel structure, practicality and flexibility are strong, satisfy the protection demand.
Drawings
FIG. 1 is a schematic layout view of water-permeable turbulating piles in an embodiment of the present invention;
FIG. 2 is a top view of the arrangement of water-permeable turbulators in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a single prefabricated section of a water-permeable turbulent flow pile in the embodiment of the utility model;
FIG. 4 is a structural top view of a single prefabricated section of a water-permeable turbulent flow pile in the embodiment of the utility model;
FIG. 5 is a view of the arrangement of river channel measuring points in the embodiment of the present invention;
FIG. 6a is a diagram illustrating the scouring depth around the pier in the embodiment of the present invention;
FIG. 6b is a self-scouring depth map around the pile in an embodiment of the present invention.
In the figure: 1-water permeable turbulent flow pile, 2-pier to be protected, 3-inner wall, 4-tongue and groove grouting hole, 5-outer wall, 6-side seam, 7-tenon and 8-broken stone.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model is described in further detail below with reference to the accompanying drawings:
the utility model provides a protection device for weakening local scouring of a pier foundation, which comprises a water-permeable turbulent flow pile 1, wherein the water-permeable turbulent flow pile 1 is arranged at the upstream of a pier 2 to be protected;
wherein, the vortex stake 1 of permeating water adopts hollow structure, and the inside packing of the vortex stake 1 of permeating water has the filler, has evenly seted up a plurality of side seams 6 on the lateral wall of the vortex stake 1 of permeating water.
According to the protection device for weakening local scouring of the pier foundation, the water-permeable turbulent flow pile 1 is arranged at the upstream of the pier 2 to be protected, the side wall of the water-permeable turbulent flow pile 1 is provided with the side seam 6 to enable the water-permeable turbulent flow pile to have water permeability, when incoming flow is blocked, a part of water flow is allowed to pass through the water-permeable turbulent flow pile 1 through the seam, so that the load effect of the water flow on the water-permeable turbulent flow pile 1 is greatly reduced compared with that of a traditional solid sacrificial pile, the requirements on the strength and stability of the foundation are lower compared with that of the solid sacrificial pile, the filler is filled in the water-permeable turbulent flow pile 1, the internal structure is complex, the flow path is more tortuous, the turbulent flow effect is higher, and the flow velocity of water flow in front of a pier and the local scouring of the pier foundation caused by the falling water flow can be effectively reduced. Meanwhile, the structural design of the utility model can disturb water flow in a turbulent flow area formed between the water-permeable turbulent flow pile 1 and the pier 2 to be protected, reduce the water flow velocity and sand carrying capacity of the turbulent flow area, reduce the scouring effect of the submerged water flow and enable silt carried by the water flow to be deposited in front of the pier so as to further reduce the local scouring of the pier.
Furthermore, the water-permeable turbulent flow pile 1 is of a prefabricated splicing structure, the prefabricated production process and equipment are simple, and the allocation, transportation and installation are convenient; specifically, the top end of the water-permeable turbulent flow pile 1 is provided with a reserved hole, the height of the protection device can be adjusted according to the height of the water surface through the mortise grouting hole 4 reserved at the top of the water-permeable turbulent flow pile 1, and the precast pile can be additionally installed through the mortise grouting hole 4 reserved at the top in a flood season, so that the protection height is increased, and the protection effect cannot be reduced due to the rising of the water level. And its weight is lighter, and the transportation is convenient, does not need too complicated construction equipment and more construction number, design benefit, novel structure, practicality and flexibility are strong, satisfy the protection demand.
Preferably, the cross-sectional form of the water and air permeable/turbulent flow pile 1 is not limited to a circle, and an ellipse, a square, a rectangle, a triangle or other polygons may be additionally selected according to practical situations, but not limited thereto.
When the cross section of the water-permeable turbulent flow pile 1 is circular, the ratio of the wall thickness of the water-permeable turbulent flow pile 1 to the diameter of the water-permeable turbulent flow pile 1 is 0.1-0.3; when the cross section of the water-permeable turbulent flow pile 1 is polygonal, the ratio of the wall thickness of the water-permeable turbulent flow pile 1 to the side length of the water-permeable turbulent flow pile 1 is 0.1-0.3, and the water-permeable turbulent flow pile can be correspondingly designed and adjusted according to actual working conditions.
When the cross section of the water-permeable turbulent flow pile 1 is circular, the ratio of the diameter of the water-permeable turbulent flow pile 1 to the diameter of the pier 2 to be protected is 0.4-1.0; when the cross section of the water-permeable turbulent flow pile 1 is polygonal, the ratio of the side length of the water-permeable turbulent flow pile 1 to the diameter of the pier 2 to be protected is 0.4-1.0, and corresponding design and adjustment can be performed according to actual working conditions.
The center distance between the water permeable turbulent flow pile 1 and the pier 2 to be protected is 2-5 times of the diameter of the pier 2 to be protected.
Preferably, the width of the side seam 6 is smaller than the particle size of the filler, the filler can be directly filled with crushed stones 8 obtained from a river channel or residual waste materials in construction, the material is convenient to obtain, the cost is low, and the application prospect is strong.
Examples
As shown in fig. 1-4, the protection device for weakening local scour of a pier foundation of the utility model is characterized in that a water-permeable turbulent flow pile 1 is arranged at the upstream of a pier 2 to be protected, and mainly comprises a cylindrical prefabricated water-permeable turbulent flow pile 1 and gravels 8 filled in the cylindrical prefabricated water-permeable turbulent flow pile 1. Wherein, the vortex stake 1 that permeates water is the form that top opening and lateral wall slotted, and the top is reserved has tongue-and-groove slip casting hole 4, and a plurality of side seams 6 have been seted up to the lateral wall, treats that protection pier 2 is the cylinder type.
In this embodiment, the diameter D1 of the water-permeable spoiler pile 1 is determined according to the diameter D2 of the protected bridge pier, and the ratio of D1 to D2 is the diameter ratio. Under the unchangeable condition of other conditions of control, because the diameter ratio is not good for the protective effect when too little, protective effect overflows and extravagant raw and other materials when too big, and the diameter ratio is bigger, and the region protected is bigger, and its protective effect is better, and consequently the diameter ratio is taken 0.4 ~ 1.0 in this embodiment and is suitable.
In this embodiment, the cross-section of the water-permeable turbulent flow pile 1 is circular.
In this embodiment, it is suitable that the center-to-center distance between the water-permeable spoiler pile 1 and the pier 2 to be protected is about 3D1, wherein the center-to-center distance is the distance between the center of the water-permeable spoiler pile 1 and the center of the pier 2 to be protected, and D1 is the diameter of the pier 2 to be protected.
In this embodiment, the wall thickness of the vortex stake 1 that permeates water and the diameter ratio of the vortex stake 1 that permeates water are 0.2, and wherein, the thickness of permeating water between the inner wall 3 of vortex stake 1 and the outer wall 5 is the wall thickness, and the wall thickness value should satisfy the requirement of the vortex stake 1 self bearing capacity and the rivers load effect of permeating water.
In the embodiment, the side wall slots are uniformly arranged on the side wall of the pile body of the water-permeable turbulent flow pile 1, 12 slots are arranged at every 30 degrees, and the width of the side wall slots is 0.5 times of the wall thickness.
Furthermore, the water-permeable turbulent flow pile 1 is formed by splicing a plurality of prefabricated sections, a mortise grouting hole 4 is reserved at the top of each prefabricated section, and adjacent prefabricated sections are fixedly connected with the mortise grouting holes 4 through tenons 7.
In the embodiment, the water-permeable turbulent flow pile 1 is formed by hoisting and splicing three prefabricated sections, grouting is firstly performed in a mortise grouting hole 4 reserved at the top end during splicing, then the tenon 7 of another prefabricated section is butted in the mortise grouting hole 4, and after the three prefabricated sections are solidified, the operations are repeated to complete the splicing of the three prefabricated sections.
In this embodiment, the rubble 8 particle diameter of packing in the vortex stake 1 hollow part that permeates water is greater than the minor face length that the side slotted, prevents that rubble 8 from slotting from breaking away from the side under the effect of rivers, and rubble 8 can directly obtain from the river course, also can use remaining construction waste to fill in the construction.
In this embodiment, when the water level increases in the flood season, the number of the prefabricated sections can be selectively increased according to the height of the water level, and the prefabricated sections are spliced above the water-permeable turbulent flow pile 1, so that the height of the pile body is increased, and the protection effect is ensured.
In the utility model, the water-permeable turbulent flow pile 1 does not need to bear vehicle load and the self weight of the bridge deck, and only needs to consider the influence of water flow to meet the design standard and requirement. Meanwhile, the protective device is simple in material obtaining, the broken stones 8 can be obtained nearby, the components can be prefabricated, the quality is guaranteed, the construction period is short, and the protective device can be repeatedly used.
Specifically, the present embodiment provides a comparison between the protection device of the present invention and the conventional protection device using solid sacrificial piles, and further illustrates the beneficial effects of the protection device of the present invention.
As shown in fig. 5, the river channel measuring points are arranged, the sacrificial piles are arranged at the upstream of the piers, the upstream surfaces of the sacrificial piles and the piers are measuring points 1(0 °), the downstream surfaces of the sacrificial piles and the piers are measuring points 5(180 °), and the rest of the measuring points are analogized.
As shown in fig. 6a and 6b, the scouring depth maps of the number 1-8 measuring points of the pier under the three conditions of no protective device, the solid sacrificial pile and the water-permeable turbulent pile 1 are drawn by polar coordinates, wherein a polar coordinate angle represents a peripier azimuth angle, 0 degree is an upstream surface, and 180 degrees is a downstream surface. The polar diameter is the scouring depth, and the original height of the riverbed is 0 cm. The average value of the number 1-8 measuring points is taken as the average scouring depth, the maximum value is taken as the maximum scouring depth, and the obtained data are shown in the table 1.
TABLE 1
As can be seen from fig. 6a and 6b and table 1, the percentage of the local scour of the pier for reduction protected by the solid sacrificial pile is 53.3%, the percentage of the local scour of the pier for reduction protected by the water-permeable turbulent pile 1 in this embodiment is 43.3%, the protection effect of the water-permeable turbulent pile 1 is 81.2% of that of the solid sacrificial pile, the local scour of the pier can be significantly weakened, meanwhile, the average scour depth of the water-permeable turbulent pile 1 is 81% of the average scour depth of the solid sacrificial pile itself, and the stability of the water-permeable turbulent pile 1 can be further improved on the basis of ensuring the weakened effect. (the experimental data provided are only for exemplary reference, for the purpose of the effectiveness of the protection device according to the utility model)
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The embodiments described in this specification are to be considered exemplary only, with a true scope of the application being indicated by the following claims.
It will be understood that the utility model is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the utility model is defined by the claims.
Claims (10)
1. A protection device for weakening local scouring of a pier foundation is characterized by comprising a water-permeable turbulent flow pile (1), wherein the water-permeable turbulent flow pile (1) is arranged at the upstream of a pier (2) to be protected;
wherein, the vortex stake of permeating water (1) adopts hollow structure, and the inside packing of vortex stake of permeating water (1) has the filler, has evenly seted up a plurality of side seams (6) on the lateral wall of vortex stake of permeating water (1).
2. The protection device for weakening local scouring of pier foundation according to claim 1, wherein the top end of the water-permeable turbulent flow pile (1) is provided with a reserved hole.
3. A protection device for weakening local scour of pier foundations according to claim 1, wherein the cross section of the water-permeable turbulent flow pile (1) is circular, oval or polygonal.
4. The protecting device for weakening local scouring of pier foundation according to claim 3, wherein when the cross section of the water-permeable turbulent flow pile (1) is circular, the ratio of the wall thickness of the water-permeable turbulent flow pile (1) to the diameter of the water-permeable turbulent flow pile (1) is 0.1-0.3.
5. The protection device for weakening local scouring of pier foundation according to claim 3, characterized in that when the cross section of the water-permeable turbulent flow pile (1) is circular, the ratio of the diameter of the water-permeable turbulent flow pile (1) to the diameter of the pier (2) to be protected is 0.4-1.0.
6. The protection device for weakening local scour of pier foundation according to claim 1, wherein the center distance between the water-permeable turbulent flow pile (1) and the pier (2) to be protected is 2-5 times of the diameter of the pier (2) to be protected.
7. The protection device for weakening local scour of pier foundations as claimed in claim 1, wherein the width of the side slots (6) is smaller than the grain size of the filler.
8. The protector for weakening local scour of pier foundation according to claim 1, wherein the width of the side seam (6) is 0.5 times of the wall thickness of the water-permeable turbulating pile (1).
9. The protection device for weakening local scouring of pier foundation according to claim 1, wherein the water-permeable turbulent flow pile (1) is formed by splicing a plurality of prefabricated sections, a mortise grouting hole (4) is reserved at the top of each prefabricated section, and adjacent prefabricated sections are fixedly connected with the mortise grouting hole (4) through a tenon (7).
10. The protection device for weakening local scour of pier foundation according to claim 1, wherein the filler inside the water-permeable turbulating pile (1) is crushed stone (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220741532.0U CN216999884U (en) | 2022-03-31 | 2022-03-31 | Protection device for be used for weakening local scour of pier foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220741532.0U CN216999884U (en) | 2022-03-31 | 2022-03-31 | Protection device for be used for weakening local scour of pier foundation |
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| CN216999884U true CN216999884U (en) | 2022-07-19 |
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| CN202220741532.0U Active CN216999884U (en) | 2022-03-31 | 2022-03-31 | Protection device for be used for weakening local scour of pier foundation |
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