CN112160288A - Pier local scouring protection device with rotating normal curved surface - Google Patents
Pier local scouring protection device with rotating normal curved surface Download PDFInfo
- Publication number
- CN112160288A CN112160288A CN202010757847.XA CN202010757847A CN112160288A CN 112160288 A CN112160288 A CN 112160288A CN 202010757847 A CN202010757847 A CN 202010757847A CN 112160288 A CN112160288 A CN 112160288A
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- Prior art keywords
- pier
- water flow
- protection device
- curved surface
- scouring
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- 238000009991 scouring Methods 0.000 title abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000001012 protector Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/20—Equipment for shipping on coasts, in harbours or on other fixed marine structures, e.g. bollards
- E02B3/26—Fenders
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a local pier scouring protection device with a rotary normal curved surface, which is sleeved on a pier, is approximately bell-shaped, has the thickness of 0.5-1 m, and has the inner surface meeting the equation of a standard rotary normal curved surface. The protection device combines the characteristics of the reciprocating flow, can disperse the front impact water flow, forms the water flow which is picked away from the periphery of the pier along the tangential direction of the convex surface, and reduces the water flow impact; on the other hand, the diversion of the lower water flow can be realized, the lower water flow is continued to be selected to the farther position of the bridge pier along the concave surface, the direct scouring effect of the lower water flow on the bed surface is weakened, and the effect of partial front impact water flow can be counteracted; and meanwhile, horseshoe vortexes around the bridge piers are reduced, so that the scouring of the horseshoe vortexes on bridge pier riverbeds is weakened, and meanwhile, the influence on the stress of the bridge piers is small.
Description
Technical Field
The invention belongs to the field of pier protection, and particularly relates to a pier local scouring protection device with a rotary normal curved surface.
Background
Local scouring around the bridge pier has great influence on the safety of the bridge foundation and is the main reason for bridge damage. The collapse of the bridge caused by local scouring around the bridge pier accounts for more than half of the total number. Therefore, it is very important to reasonably and fully protect the local scour of the bridge pier.
The reasons for the scouring of the water flow around the pier can be divided into three parts: (1) the forward water flow is concentrated, which mainly means that when the forward water flow meets an obstacle, the cross section area is reduced, the cross section flow velocity is increased, and silt is rolled to form a scouring pit; (2) bottom washing by descending water flow, which mainly means that the forward water flow impacts the pier to form a part of descending water flow to bottom washing the pier bottom; (3) wake vortex scouring mainly refers to wake vortex formed after water flow bypasses barriers and takes away partial silt behind the piers. The specific principle is shown in fig. 1.
The protection of the local scour of the bridge pier is one of the important contents of bridge protection, and the local scour protection measures of the bridge are mainly divided into two types: (1) and (6) active protection. The scouring energy of the water flow to the bridge pier is reduced, namely, the downwash and the horseshoe vortex flow in the water flow scouring process are weakened, and the scouring energy of the water flow is reduced by measures such as enlarging the base plane of the bridge pier or arranging a protection foot. (2) And (6) passive protection. The anti-impact capability of a bottom bed near a pier is improved, and a river bed protective layer made of coarse-particle materials is usually paved near the pier or stones are thrown at the pier base to improve the anti-impact capability of the pier.
The active protection measures comprise protection measures such as slotting protection, ring wing type pier protection, guard ring protection, pile front sacrificial pile and the like; the passive protection measures comprise riprap protection, foot protection, caisson scour prevention, foundation expansion protection and the like. The existing partial protection measures have the defects of high cost, poor protection effect and the like, or can not effectively resist disastrous marine environments such as typhoon, storm surge and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the pier local scouring protection device with the rotating normal curved surface, which has a good protection effect and can effectively protect the pier.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a rotatory normal curved surface's pier local scour protector, its characterized in that, this protector cover is established on the pier, and the shape is similar bell-shaped to the center of pier and the planar nodical of riverbed that does not erode are the centre of a circle, and be the x axle positive direction along the rivers direction, and the pier axis upwards is the z axle positive direction, and the direction of perpendicular to xoz face is the y axle, protector's thickness be 0.5 ~ 1m, and its inner surface satisfies following standard normal curved surface's equation of revolution
Wherein,
d is the diameter of the pier, sigma is the standard deviation, and the value of sigma is related to the water depth H and the diameter D of the pier so as to ensure that the protection device is positioned
Within the range; h is0The height h of the lower surface of the protective device from the surface of the unwashed riverbed0∈(0,5m,2m)。
Further, the thickness of the guard is preferably 0.8 m.
Further, the protective device is made of reinforced concrete materials.
The invention has the following beneficial effects:
the protective device of the invention fully utilizes the structural characteristics, combines the characteristics of the reciprocating flow, can disperse the front impact water flow, forms the water flow which is picked away from the periphery of the pier along the tangential direction of the convex surface, and reduces the water flow impact; on the other hand, the diversion of the lower water flow can be realized, the lower water flow is continued to be selected to the farther position of the bridge pier along the concave surface, the direct scouring effect of the lower water flow on the bed surface is weakened, and the effect of partial front impact water flow can be counteracted; and meanwhile, horseshoe vortexes around the bridge piers are reduced, so that the scouring of the horseshoe vortexes on bridge pier riverbeds is weakened, and meanwhile, the influence on the stress of the bridge piers is small.
Drawings
Fig. 1 is a schematic diagram of local scour around a pier in the background art.
FIG. 2 is a side view of a normal surface protection of a rotating pier surrounding pier, which reflects the diversion of descending water under the structure.
Fig. 3 is a perspective view of a pier normal rotation curved surface protection device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the invention will become more apparent. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figures 2 and 3, figure 2 is a side view of a rotary normal curved surface around a pier, figure 3 is a perspective view of the rotary normal curved surface protection device, the rotary normal curved surface protection device is a local scour protection device for the pier, the protection device is sleeved on the pier, the shape of the rotary normal curved surface protection device is approximately bell-shaped, the intersection point of the center of the pier and the plane of an unwashed riverbed is taken as an original point, the direction of water flow is the positive direction of an x axis, the upward direction of the axis of the pier is the positive direction of a z axis, and the direction vertical to the xoz plane is the y axis, and the protection device meets the
Wherein,
d is the diameter of the pier, sigma is the standard deviation, and the value of sigma is related to the water depth H and the diameter D of the pier so as to ensure that the protection device is positioned
Within the range; h is0The height h of the lower surface of the protective device from the surface of the unwashed riverbed0∈(0,5m,2m)。
As shown in fig. 2, when the downward water flow at the front part of the pier flows through the structure, separation occurs at a position A, a part of the water flow flows away in the opposite direction along the downward tangent plane direction, a part of the water flow flows downward along the normal curved surface structure until the horizontal tangent position of the bottom of the structure is reached, and the part of the water flow flows away in the opposite direction along the tangent plane. The curve is rotated by 360 degrees around the surface of the pier to form a rotary normal curved surface.
Taking a cylindrical pier with a diameter of 5m as an example, the water depth is 10 m. The direction along the water flow is taken as the positive direction of an x axis, and the upward direction is taken as the positive direction of a z axis. The protective device is installed in the range of 1m to 3m above the river bed bottom in the z-axis direction, and the diameter of the protective device is 15 m.
The protection device is a rotary normal hyperboloid in shape and is close to the surface of a pier
And the slope of the normal curved surface is approximately equal to 0, the flow direction of the water flow is changed, the downward water flow force of the device is concentrated by the water flow, and the bending moment caused by the water flow force is very small because the part is close to the axis of the pier, so that the influence on the self structure of the pier is very small. At the bottom of the structure
And the slope of the normal curved surface is approximately equal to 0, the flow direction of the water flow is changed, and the front scouring water flow flows back to offset the impact of partial front water flow on the pier close to the bottom. The water flow between the structure and the pier scouring pit is stable, horseshoe-shaped vortexes are not easy to form, and scouring (river bed erosion) of the lower part of the pier is further reduced. And the structure is a 360-degree three-dimensional structure and can be suitable for the condition of reciprocating flow of tidal estuaries.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The utility model provides a rotatory normal curved surface's pier local scour protector, its characterized in that, this protector cover is established on the pier, and the shape is similar bell-shaped to the center of pier and the planar nodical of riverbed that does not erode are the original point, and be the x axle positive direction along the rivers direction, and the pier axis upwards is the z axle positive direction, and the direction of perpendicular to xoz face is the y axle, protector's thickness be 0.5 ~ 1m, and its inner surface satisfies following standard normal curved surface's equation of revolution
Wherein,
d is the diameter of the pier, sigma is the standard deviation, and the value of sigma is related to the water depth H and the diameter D of the pier so as to ensure that the protection device is positioned
Within the range. h is0The height h of the lower surface of the protective device from the surface of the unwashed riverbed0∈(0,5m,2m)。
2. The local scour protection device for piers with normal surfaces of revolution according to claim 1, wherein the thickness of the protection device is preferably 0.8 m.
3. The local scour protection device for piers with normal surfaces of revolution as claimed in claim 1, wherein the protection device is made of reinforced concrete material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757847.XA CN112160288A (en) | 2020-07-31 | 2020-07-31 | Pier local scouring protection device with rotating normal curved surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757847.XA CN112160288A (en) | 2020-07-31 | 2020-07-31 | Pier local scouring protection device with rotating normal curved surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112160288A true CN112160288A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010757847.XA Pending CN112160288A (en) | 2020-07-31 | 2020-07-31 | Pier local scouring protection device with rotating normal curved surface |
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| Country | Link |
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| CN (1) | CN112160288A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746556A (en) * | 2021-01-12 | 2021-05-04 | 浙江大学 | Pier scouring protection method combining concave rotating normal curved surface and granular particles |
| WO2021253824A1 (en) * | 2021-01-12 | 2021-12-23 | 浙江大学 | Bridge pier scour protection method combining concave normal surface of revolution and particle material |
| CN114150711A (en) * | 2021-12-10 | 2022-03-08 | 华能赫章风力发电有限公司 | Offshore wind turbine foundation anti-scouring protection structure and construction method |
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| CA2630957A1 (en) * | 2005-07-12 | 2007-01-18 | Robie Bonilla Gris | Covering element for protecting structures against scouring and drag force |
| CN104895007A (en) * | 2015-05-19 | 2015-09-09 | 浙江大学 | Spur dike being of double-variable normal surface shape |
| CN106812159A (en) * | 2017-03-14 | 2017-06-09 | 天津大学 | A kind of offshore wind farm single-pile foundation protection against erosion sleeve |
| CN106968277A (en) * | 2017-04-06 | 2017-07-21 | 天津大学 | A kind of assembled offshore pile scour protection device and its construction method |
| CN111236290A (en) * | 2020-01-20 | 2020-06-05 | 重庆大学 | Simple environment-friendly device suitable for preventing pier pile foundation from scouring and construction method |
-
2020
- 2020-07-31 CN CN202010757847.XA patent/CN112160288A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2630957A1 (en) * | 2005-07-12 | 2007-01-18 | Robie Bonilla Gris | Covering element for protecting structures against scouring and drag force |
| CN104895007A (en) * | 2015-05-19 | 2015-09-09 | 浙江大学 | Spur dike being of double-variable normal surface shape |
| CN106812159A (en) * | 2017-03-14 | 2017-06-09 | 天津大学 | A kind of offshore wind farm single-pile foundation protection against erosion sleeve |
| CN106968277A (en) * | 2017-04-06 | 2017-07-21 | 天津大学 | A kind of assembled offshore pile scour protection device and its construction method |
| CN111236290A (en) * | 2020-01-20 | 2020-06-05 | 重庆大学 | Simple environment-friendly device suitable for preventing pier pile foundation from scouring and construction method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746556A (en) * | 2021-01-12 | 2021-05-04 | 浙江大学 | Pier scouring protection method combining concave rotating normal curved surface and granular particles |
| WO2021253824A1 (en) * | 2021-01-12 | 2021-12-23 | 浙江大学 | Bridge pier scour protection method combining concave normal surface of revolution and particle material |
| CN112746556B (en) * | 2021-01-12 | 2022-04-19 | 浙江大学 | Pier scouring protection method combining concave rotating normal curved surface and granular particles |
| JP2022549406A (en) * | 2021-01-12 | 2022-11-25 | 浙江大学 | Bridge Pier Wash Protection Method Combining Downward Concave Rotating Regular Curved Surface and Scattered Granules |
| JP7261525B2 (en) | 2021-01-12 | 2023-04-20 | 浙江大学 | Bridge Pier Wash Protection Method Combining Downward Concave Rotating Regular Curved Surface and Scattered Granules |
| US11987941B2 (en) | 2021-01-12 | 2024-05-21 | Zhejiang University | Pier scour protection method by combinating a downward bivariate normal distribution surface and granular mixture |
| CN114150711A (en) * | 2021-12-10 | 2022-03-08 | 华能赫章风力发电有限公司 | Offshore wind turbine foundation anti-scouring protection structure and construction method |
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Application publication date: 20210101 |