CN114351568B - Ecological diversion pier structure for long-span wading bridge - Google Patents
Ecological diversion pier structure for long-span wading bridge Download PDFInfo
- Publication number
- CN114351568B CN114351568B CN202210014536.3A CN202210014536A CN114351568B CN 114351568 B CN114351568 B CN 114351568B CN 202210014536 A CN202210014536 A CN 202210014536A CN 114351568 B CN114351568 B CN 114351568B
- Authority
- CN
- China
- Prior art keywords
- pier
- dam
- diversion
- water
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 33
- 230000003116 impacting effect Effects 0.000 claims abstract description 5
- 230000001154 acute effect Effects 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 241000251468 Actinopterygii Species 0.000 abstract description 25
- 230000000052 comparative effect Effects 0.000 description 14
- 238000011835 investigation Methods 0.000 description 11
- 241000894007 species Species 0.000 description 11
- 238000011010 flushing procedure Methods 0.000 description 10
- 239000002028 Biomass Substances 0.000 description 8
- 238000010992 reflux Methods 0.000 description 8
- 238000009991 scouring Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000001066 destructive effect Effects 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 239000013049 sediment Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 238000009954 braiding Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Landscapes
- Revetment (AREA)
Abstract
The invention discloses an ecological diversion pier structure for a long-span wading bridge, which comprises a pier protection dam and a diversion dam, wherein the diversion dam is positioned on one side of a pier on the side of a channel, is arranged in a straight line along the water flow direction and forms an acute angle with the main flow direction of the water flow, so that the water is conveniently guided into the channel through the action of the diversion dam; the pier protection dam is arranged on the back water side of the guide dam and is positioned at the upstream of the pier, the upstream end of the pier protection dam is connected with the middle of the guide dam, and the downstream end of the pier protection dam is positioned on the side of the pier far away from the channel side, so that the guide dam and the pier protection dam form a protection structure at the upstream of the pier, and water flow is prevented from directly impacting the pier. The diversion pier structure has the diversion function, can flush deep navigation grooves, maintain the dimensions of the navigation channels, reduce the influence of bridges on the navigation channels, improve the surrounding ecological environment and create good habitat for river organisms such as fish and the like.
Description
Technical Field
The invention belongs to the technical field of water conservancy and water transportation, and particularly relates to an ecological diversion pier protection structure for a long-span wading bridge.
Background
In the mountain river and reservoir tail water change areas, the flow velocity in the river is easily influenced due to large gradient and water level amplitude in the river and reservoir, so that piers are eroded and eroded, and the operation safety of bridges and channels is influenced. In order to avoid damage to the bridge pier caused by direct impact of water flow, the bridge pier is usually required to be provided with a pier protection structure, so that scouring is reduced.
The traditional method is to arrange a traditional inverted U-shaped pier protection structure near the bridge pier or adopt a steel plate and concrete annular cofferdam type pier protection structure, so that a static flow area is formed near the bridge pier, the flushing of the bridge pier is avoided, and the bridge safety is ensured. The traditional pier protection structure generally has no flow guiding effect, so that the navigation condition near the bridge is deteriorated, and meanwhile, the topography combining the flow state and the flushing and silting of the rapid and slow flow alternation is difficult to generate in the non-navigation area, so that the energy and the material exchange between the water flow near the pier and the river flow are blocked.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an ecological diversion pier structure for a long-span wading bridge, which has a diversion function, can flush a deep channel, maintain the channel scale, reduce the influence of the bridge on the channel, improve the surrounding ecological environment and create a good habitat for river organisms such as fish and the like.
The technical scheme of the invention is realized as follows:
The ecological diversion pier structure comprises a pier protection dam and a diversion dam, wherein the diversion dam is positioned at one side of a pier at the side of a channel, is arranged in a straight line along the water flow direction and forms an acute angle with the main flow direction of the water flow, so that the water is conveniently guided into the channel through the action of the diversion dam; the pier protection dam is arranged on the back water side of the guide dam and is positioned at the upstream of the pier, the upstream end of the pier protection dam is connected with the middle of the guide dam, and the downstream end of the pier protection dam is positioned on the side of the pier far away from the channel side, so that the guide dam and the pier protection dam form a protection structure at the upstream of the pier, and water flow is prevented from directly impacting the pier.
Further, the retaining dams are arranged in a straight line.
Further, the retaining dam is of an arc-shaped structure.
Further, grooves penetrating through the water facing side and the water backing side of the retaining dam are formed in the top surface of the retaining dam, and water can flow into the bridge pier conveniently through the grooves.
Further, the included angle between the diversion dam and the main flow direction of the water flow is 10-30 degrees.
Further, the top width of the diversion dam and the pier protection dam is 0.5 m-1 m; and the slope coefficients of the upstream side of the diversion dam and the upstream side of the pier protection dam are both larger than 1, and the slope coefficient of the downstream side is both larger than 0.5.
Further, the distance between the slope toe of the upstream surface of the diversion dam and the channel is more than 0.5 m.
Further, the distance between the water surface of the diversion back of dam and the water surface of the pier back of dam and the pier is greater than 0.5 and m.
Further, the downstream ends of the retaining dam and the guide dam reach at least 1/3 of the bridge pier length.
Compared with the prior art, the invention has the following beneficial effects:
1. The diversion pier-protecting structure has diversion effect and pier-protecting effect, can guide most of water flow into the channel, and can flush the channel to ensure the depth and flow velocity in the channel and optimize the navigation condition, and meanwhile, the diversion dam and the pier-protecting dam can protect the bridge pier, so that the bridge pier is prevented from being damaged by the direct impact of the water flow to the bridge pier, and the stability of the bridge is ensured.
2. The invention can generate various flow states and terrains around the diversion pier structure in a diversion and diversion combined mode, and can form a rapid flow area, a slow flow area and a still water area around the pier, wherein the rapid flow area can be used as a spawning ground and a habitat of partial fishes, sediment accumulation occurs in the slow flow area and the still water area, and sediment substances can be used as a cableway field and a spawning ground of the fishes and a habitat of benthonic organisms, so that the aim of improving the surrounding ecological environment and creating good habitat for the river organisms such as the fishes is fulfilled.
Drawings
FIG. 1-schematic diagram of the present invention.
FIG. 2-schematic diagram of the structure of the present invention.
Fig. 3-section A-A of fig. 1.
Fig. 4-section B-B of fig. 1.
Fig. 5-a front view in the C-C direction of fig. 1.
FIG. 6-section D-D of FIG. 1
Wherein: 1-pier; 2-a diversion dam; 3-retaining a pier dam; 4-grooves; ① -a slow flow region; ② -an emergency flow zone; ③ -a still water zone.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1-6, an ecological diversion pier structure for a long-span wading bridge comprises a pier protection dam 3 and a diversion dam 2, wherein the diversion dam 2 is positioned on one side of a pier 1 on the side of a channel, and the diversion dam 2 is arranged in a straight line along the water flow direction and forms an acute angle with the main flow direction of the water flow, so that water can conveniently flow through the diversion dam 2 to be led into the channel; the fender dam 3 is arranged on the leeward side of the guide dam 2 and is positioned at the upstream of the bridge pier 1, the upstream end of the fender dam 3 is connected with the middle part of the guide dam 2, and the downstream end of the fender dam 3 is positioned on the side of the bridge pier 1 far away from the channel side, so that the guide dam 2 and the fender dam 3 form a protection structure at the upstream of the bridge pier 1, and water flow is prevented from directly impacting the bridge pier 1.
The long-span wading bridge is generally provided with only one or two piers, and when only one pier exists, the channel is arranged at one side of the piers, so that a diversion pier protection structure is arranged at one side of the piers at the channel side; when two piers exist, the channel is arranged between the two piers, two diversion pier protection structures are arranged between the two piers, and the two diversion pier protection structures are arranged in one-to-one correspondence with the two piers and are symmetrically arranged relative to the channel. The diversion dam plays a role in diversion and diversion simultaneously, and the diversion dam can guide most of water flow into the channel, so that the depth and the flow speed in the channel can be ensured, the navigation condition is optimized, and only a small part of water flow flows into the diversion back of dam side, so that the scouring of piers is reduced; meanwhile, the guide dam and the pier protection dam form a protection wall type structure, so that the bridge pier is prevented from being damaged by water flow directly impacting the bridge pier.
Meanwhile, as shown in fig. 1 and 2, after the pier protection dam and the diversion dam are arranged, various flow states and terrains can be generated on the periphery of the diversion pier protection structure in a diversion and diversion combined mode. The flow field of the peripheral area of the pier can be divided into three types by the flow guiding pier structure, the first type is a rapid flow area ② at the upstream side of the flow guiding dam, the second type is a flow guiding back of dam water surface, the upstream side of the pier protecting dam and a slow flow area ① near the pier corresponding to the downstream of the flow guiding pier structure, the third type is a still water area ③ between the flow guiding pier structure and the pier, and the different flow areas are mutually communicated. The first type of rapid flow area ② has stronger scouring characteristics, is easy to generate a deep pool, changes the water depth along with the change of a water-facing slope, and can be used as a spawning site and a habitat of partial fishes; meanwhile, sediment is deposited in the second slow flow area ① and the third still water area ③, and sediment substances can be used as a cableway field and a spawning ground of fishes and habitat of benthos.
The diversion pier structure is suitable for mountain rivers and reservoir falling zones with the water depth of 3-5 m, and the diversion pier structure design top elevation h=the level of constant flood, the wave height of the traveling wave of the ship and the safe superelevation, so that scouring damage caused by large-flow dam turning is prevented.
In the concrete implementation, the retaining dams 3 are arranged in a straight line, as shown in fig. 2; meanwhile, the retaining dam 3 may be configured to have an arc-shaped structure as shown in fig. 1.
As can be seen from fig. 1 and 2, the flow guiding and pier protecting structure formed by the flow guiding dam and the pier protecting dam is in a lambda shape, and an inverted V-shaped or inverted U-shaped protecting structure is formed at the upstream of the pier to protect the pier.
In specific implementation, the top surface of the retaining dam 3 is provided with a groove 4 penetrating through the water facing side and the water backing side of the retaining dam 3, so that water can flow through the groove 4 and flow into the pier 1.
In the embodiment, two grooves with the width of 0.5m are arranged, the bottom of each groove is lower than the normal water level of 0.2m, the periphery of each groove is reinforced by thin layer concrete, so that the water systems of the still water area ③ and the slow flow area ① can be better communicated, plankton, algae and aquatic weed types on the surface of the still water area ③ are improved, and substances are added for exchanging substances, fish food sources and spawning attachments.
In specific implementation, the included angle between the diversion dam 2 and the main flow direction of the water flow is 10-30 degrees. The diversion dam is prevented from bearing larger water flow impact load.
In the concrete implementation, the top widths of the diversion dam 2 and the retaining dam 3 are 0.5 m-1 m; and the slope coefficients of the upstream side of the diversion dam 2 and the pier protection dam 3 are both larger than 1, and the slope coefficient of the downstream side is both larger than 0.5.
The stability of the diversion pier structure is ensured.
In the concrete implementation, the distance between the slope toe of the water facing surface of the diversion dam 2 and the boundary line of the channel is more than 0.5m. The distance between the back surface of the guide dam 2 and the bridge pier 1 and the distance between the back surface of the retaining dam 3 are both more than 0.5m. The downstream ends of the retaining dam 3 and the guide dam 2 reach at least 1/3 of the bridge pier 1 length.
During implementation, the rockfill, the starching block stone or the gabion can be selected according to the river channel flow velocity, the silt flushing condition and the incoming flow sand carrying condition so as to ensure the water permeability and the ecology of the diversion pier structure. The upstream end of the diversion dam adopts a pile bearing structure or adopts a stone throwing and bottom protection technology to prevent damage caused by the water flow brushing of the dam head. The gabions are connected by binding in the diversion pier structure. And a fish groove brick is arranged at the slope toe of the whole diversion pier structure, so that a proper habitat environment for fishes is created.
1. The engineering profiles for example 1 and comparative example 1 are as follows:
a river bridge is newly built on a river in a mountain area, and a deep cover layer is covered on a river bed to reach 27m according to the geological survey data. The water level in the flood season of the center line of the bridge to be built is 1272m, the corresponding water depth is 3.0m, and the average flow velocity in the river channel is 6.7m/s. The river channel is internally provided with a travel channel with 40 people with maximum passenger capacity. According to the early ecological investigation, 12 species of fishes and 31 species of benthos exist in the river reach.
For the above engineering, different pier structures were set at the right pier according to example 1 and comparative example 1, and prototype observations of one-year flow regime and nearby ecology were carried out.
Example 1
The structure of the lambda-shaped diversion pier structure is shown in fig. 2, and the difference is that the top surface of the pier-protecting dam is not provided with a groove, and the lambda-shaped diversion pier-protecting structure is arranged at the upstream of the pier 1. The left side of the bridge pier is a main channel, and the main stream is guided into the main channel through the guide dam and the pier protection dam. The dam foot of the lambda-shaped diversion pier structure adopts fish nest bricks, the dam head of the diversion dam adopts pile sinking structures, and the rest dam bodies and the diversion pier structure adopt rock piles. The included angle between the flow guiding dam and the water flow is set to be 30 degrees, and the top width of the whole structure is 1.0m. According to the river depth, the structural height is 3.6m, so the top elevation is 1272.6m. The coefficient of the upstream side slope and the coefficient of the downstream side slope of the pier protection structure are both set to be 1, so that the total width of the pier protection structure is 8.2m, and the distance between the toe of the downstream side slope of the pier protection structure and the pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the slope foot of the water facing surface of the diversion pier structure and the main channel is more than 0.5m. In order to ensure good pier protection effect, the tail end position of the pier protection structure is positioned at 1/3 of the pier length.
Prototype observations: under the condition of constant flood level, the maximum cross flow velocity in the main channel is 0.17m/s, and the maximum reflux velocity is 0.12m/s, thereby meeting the navigation requirement. After the flood peak is over, the bridge pier is deposited before and after, and no destructive scouring is caused. The lambda-shaped diversion pier structure is kept stable. In the biomass investigation of the spring and autumn after the lambda-shaped diversion pier structure is built, 12 fish species and 30 benthos species are found in the vicinity of the diversion pier structure.
Comparative example 1
This comparative example employed a vertical inverted "U" shaped concrete pier construction. The top width of the structure is 0.6m, the height is 4m, and the distance between the back surface and the bridge pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the pier structure and the main channel is 8.9m.
Prototype observations: under the condition of constant flood level, the maximum cross flow velocity in the main channel is 0.57m/s, and the maximum reflux velocity is 0.23m/s, so that the navigation requirement cannot be met. After the flood peak is over, the bridge pier is deposited before and after, and no destructive scouring is caused. The front part of the inverted U-shaped pier protection structure is scoured, and the depth of the scour is 2.0m. In the biomass investigation of the spring and autumn after the inverted U-shaped pier-protecting structure is built, only 6 fishes and 11 benthos are found nearby.
2. The engineering profiles of example 2 and comparative example 2 are as follows
The bridge of the hydro-fluctuation belt in a certain reservoir area is influenced by steep rise and steep fall of the water level for a long time, the bridge pier is eroded, and the maximum pit flushing near the bridge pier reaches 4.5m according to underwater monitoring data, so that the operation safety of the bridge is influenced. The flood season constant flood level at the central line of the bridge is 877m, the corresponding water depth is 5.0m, and the maximum critical flow velocity in the river is 4.6m/s. The river channel is internally provided with a three-level freight channel with a navigation ship of 1000 tons. According to the early ecological investigation, 8 fish species and 46 benthos species exist in the river reach.
For the above engineering, different pier structures were set at the right pier according to example 2 and comparative example 2, and prototype observations of one-year flow regime and nearby ecology were carried out.
Example 2
The structure of the inverted lambda-shaped diversion pier structure is shown in fig. 1, and the difference is that no groove is arranged on the top surface of the pier-protecting dam, and the lambda-shaped diversion pier structure is arranged at the upstream of the pier 1. The right side of the bridge pier is a main channel, and the main stream is guided into the main channel through the guide dam 2 and the retaining dam 3. The dam foot of the lambda-shaped diversion pier structure adopts fish nest bricks, the dam head of the diversion dam adopts rock-fill to protect the bottom, and the rest dam bodies and the pier protection structure adopt gabion. Gabion is formed by mechanically braiding low-carbon steel wires with high corrosion resistance, high strength and ductility. The included angle between the flow guiding dam and the main flow is set to 10 degrees, and the whole top width of the structure is 0.5m. According to the river depth, the structural height is 5.5m, so the top elevation is 877.5m. The upstream side slope of the guide pier structure is 1, and the coefficient of the downstream side slope is 0.5, so that the total width of the guide pier structure is 8.75m, and the distance between the downstream side slope of the guide pier structure and the pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 12m, the distance between the slope foot of the water facing surface of the diversion pier structure and the main channel is more than 0.5m. In order to ensure good pier protection effect, the tail end (downstream end) of the pier protection structure is positioned at 1/2 of the pier length.
Prototype observations: under the condition of combining the highest water level with the constant flood level, the maximum cross flow velocity in the main channel is 0.11m/s, and the maximum reflux flow velocity is 0.08m/s, thereby meeting the navigation requirement. After the pier pit is restored, no secondary flushing and no destructive flushing are performed. The maximum punching depth of the front part of the lambda-shaped diversion pier structure is 0.8m. In the biomass investigation of the spring and autumn after the lambda-shaped diversion pier structure is built, 8 fish species and 37 benthos species are found near the diversion pier structure.
Comparative example 2
This comparative example adopts a vertical steel plate pier structure. The top width of the structure is 0.1m, the height is 5.5m, and the distance between the back surface and the bridge pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 12m, the distance between the pier structure and the main channel is 11.4m.
Prototype observations: under the condition of constant flood level, the maximum cross flow velocity in the main channel is 0.66m/s, and the maximum reflux velocity is 0.10m/s, so that the navigation requirement cannot be met. After the flood peak is frequently over, the bridge pier is not destructively scoured before and after. But the front part of the pier protecting structure is scoured, and the depth is 3.2m. In the biomass investigation of the spring and autumn after the pier protection structure is built, only 3 fish species and 18 benthos species are found nearby.
3. The engineering profiles of example 3 and comparative example 3 are as follows
Because a certain engineering bridge is influenced by seasonal changes of water level and flow velocity of a reservoir area for a long time, the bridge pier is eroded, soil around the bridge pier is hollowed out, and the maximum pit flushing near the bridge pier reaches 3.6m according to underwater monitoring data, so that the operation safety of the bridge is influenced. The flood season constant flood level at the central line of the bridge is 196.6m, the corresponding water depth is 3.5m, and the maximum critical flow velocity in the river is 2.7m/s. Four-level freight channels with 500 tons of navigation ships are arranged in the river channel. According to the early ecological investigation, 9 species of fishes and 24 species of benthos exist in the river reach.
For the above engineering, different pier structures were set at the right pier according to example 3 and comparative example 3, and prototype observations of one-year flow regime and nearby ecology were carried out.
Example 3-1
The structure of the inverted lambda-shaped diversion pier structure with the groove at the dam crest is shown in fig. 1, and the lambda-shaped diversion pier structure is arranged at the upstream of the pier. The lambda-shaped flow guiding pier protecting structure is characterized in that the flow guiding dam is connected with the pier protecting structure through a short arc, and the pier protecting structure is arranged in an inverted U shape. The right side of the bridge pier is a main channel, and the main stream is guided into the main channel through the guide dam and the pier protection dam. The dam foot of the lambda-shaped diversion pier structure adopts fish nest bricks, the groove part is reinforced by thin layer concrete, the dam head of the diversion dam adopts rock-fill to protect the bottom, and the rest dam bodies and the diversion pier structure adopt gabion. Gabion is formed by mechanically braiding low-carbon steel wires with high corrosion resistance, high strength and ductility. The included angle between the flow guiding dam and the main flow is set to 20 degrees, and the top width of the whole structure is 0.8m. According to the river depth, the structural height is 4m, so the top elevation is 200.6m. The upstream side slope of the flow guiding pier structure is 1, and the coefficient of the upstream side slope is 0.6, so that the total width of the flow guiding pier structure is 7.2m. The dam top of the retaining dam is provided with two grooves with the depth of 0.7m and the width of 0.5m, and the grooves are respectively arranged at the positions 4m and 6m away from the guide dam. The distance between the slope toe of the back surface of the diversion pier structure and the pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the slope foot of the water facing surface of the diversion pier structure and the main channel is more than 0.5m. In order to ensure good bridge pier protection effect, the tail end position of the flow guiding pier protecting structure is positioned at 1/3 of the bridge pier length.
Prototype observations: under the condition of combining the highest water level with the constant flood level, the maximum cross flow velocity in the main channel is 0.16m/s, and the maximum reflux flow velocity is 0.10m/s, thereby meeting the navigation requirement. And no secondary flushing is performed after the pier pit is restored. The lambda-shaped diversion pier structure is kept stable. In the investigation of the biomass in spring and autumn after the lambda-shaped diversion pier structure is built, 10 fish species and 28 benthos species are found in the vicinity of the diversion pier structure.
Comparative example 3-1
This comparative example employed a vertical inverted "U" shaped concrete pier structure with a groove in the top of the dam. The top width of the structure is 0.5m, the height is 4.5m, and the distance between the back surface and the bridge pier is 0.5m. The dam top of the pier protecting structure is provided with two grooves with the depth of 0.7m and the width of 0.5m, and the grooves are respectively arranged at the positions 4m and 6m away from the diversion dam. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the pier structure and the main channel is 9m.
Prototype observations: under the condition of constant flood level, the maximum cross flow velocity in the main channel is 0.49m/s, and the maximum reflux velocity is 0.14m/s, so that the navigation requirement cannot be met. After the flood peak is over, the bridge pier is deposited before and after, and no destructive scouring is caused. But the front part of the pier protecting structure is scoured, and the depth of the scour is 2.4m. In the biomass investigation of the spring and autumn after the pier protection structure is built, only 5 fishes and 14 benthos are found nearby.
Example 3-2
The structure of the inverted lambda-shaped diversion pier without the groove is shown in fig. 1, and the difference is that the groove is not arranged on the top surface of the pier-protecting dam, and the lambda-shaped diversion pier-protecting structure is arranged at the upstream of the pier. The lambda-shaped flow guiding fender pier structure is characterized in that the flow guiding dam is connected with the fender pier dam by utilizing a short arc, and the fender pier structure is arranged in an inverted U shape. The right side of the bridge pier is a main channel, and the main stream is guided into the main channel through the guide dam and the pier protection dam. The dam foot of the lambda-shaped diversion pier protecting structure adopts fish nest bricks, the dam head of the diversion dam adopts rock-fill to protect the bottom, and the rest dam bodies and the pier protecting structure adopt gabion. Gabion is formed by mechanically braiding low-carbon steel wires with high corrosion resistance, high strength and ductility. The included angle between the flow guiding dam and the main flow is set to 20 degrees, and the top width of the whole structure is 0.8m. According to the river depth, the structural height is 4m, so the top elevation is 200.6m. The upstream side slope of the flow guiding pier structure is 1, and the coefficient of the back side slope is 0.6, so that the total width of the flow guiding pier structure is 7.2m, and the distance between the back side slope of the flow guiding pier structure and the pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the slope foot of the water facing surface of the diversion pier structure and the main channel is more than 0.5m. In order to ensure good bridge pier protection effect, the tail end position of the flow guiding pier protecting structure is positioned at 1/3 of the bridge pier length.
Prototype observations: under the condition of combining the highest water level with the constant flood level, the maximum cross flow velocity in the main channel is 0.16m/s, and the maximum reflux flow velocity is 0.10m/s, thereby meeting the navigation requirement. After the pier pit is restored, no secondary flushing and no destructive flushing are performed. The lambda-shaped diversion pier structure is kept stable. In the investigation of the biomass in spring and autumn after the lambda-shaped diversion pier structure is built, 9 fish species and 23 benthos species are found in the vicinity of the diversion pier structure.
Comparative example 3-2
This comparative example employed a groove-free upright inverted "U" shaped concrete pier construction. The top width of the structure is 0.5m, the height is 4.5m, and the distance between the back surface and the bridge pier is 0.5m. Considering that the distance between the bridge pier and the main channel is 10m, the distance between the pier structure and the main channel is 9m.
Prototype observations: under the condition of constant flood level, the maximum cross flow velocity in the main channel is 0.49m/s, and the maximum reflux velocity is 0.14m/s, so that the navigation requirement cannot be met. After the flood peak is over, the bridge pier is deposited before and after, and no destructive scouring is caused. But the front part of the pier protecting structure is scoured, and the depth is 2.2m. In the biomass investigation of the spring and autumn after the pier protection structure is built, only 4 fish species and 11 benthos species are found nearby.
Finally, it should be noted that the above-mentioned examples of the present invention are only illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. Not all embodiments are exhaustive. Obvious changes and modifications which are extended by the technical proposal of the invention are still within the protection scope of the invention.
Claims (9)
1. The ecological diversion pier structure for the long-span wading bridge is characterized by comprising a pier protection dam and a diversion dam, wherein the diversion dam is positioned on one side of a pier on the side of a channel, is arranged in a straight line along the water flow direction and forms an acute angle with the main flow direction of the water flow, so that the water can be conveniently led into the channel through the action of the diversion dam; the pier protection dam is arranged on the back water side of the guide dam and is positioned at the upstream of the pier, the upstream end of the pier protection dam is connected with the middle of the guide dam, and the downstream end of the pier protection dam is positioned at one side of the pier far away from the channel side, so that the guide dam and the pier protection dam form a protection structure at the upstream of the pier, and water flow is prevented from directly impacting the pier; the flow field of the periphery area of the pier is divided into an emergency flow area at the upstream side of the flow guiding dam, a water surface of the flow guiding back of dam, a flow slowing area near the pier corresponding to the downstream of the flow guiding pier structure and a still water area between the flow guiding pier structure and the pier by the flow guiding pier structure.
2. The ecological diversion pier structure for long-span wading bridges of claim 1, wherein the pier protection dams are arranged in a straight line.
3. An ecological diversion pier structure for long span wading bridges as claimed in claim 1, wherein the pier protection dam is in an arc-shaped structure.
4. An ecological diversion pier structure for long span wading bridge according to claim 2 or 3, wherein the top surface of the pier-protecting dam is provided with grooves penetrating the water-facing side and the water-backing side of the pier-protecting dam, so that water can flow through the grooves to the pier.
5. The ecological diversion pier structure for long-span wading bridges according to claim 1, wherein an included angle between the diversion dam and the main flow direction of water flow is 10-30 degrees.
6. The ecological diversion pier structure for long-span wading bridges according to claim 1, wherein the top width of the diversion dam and the pier protection dam is 0.5 m-1 m; and the slope coefficients of the upstream side of the diversion dam and the upstream side of the pier protection dam are both larger than 1, and the slope coefficient of the downstream side is both larger than 0.5.
7. The ecological diversion pier structure for long-span wading bridges according to claim 1, wherein the distance between the slope toe of the diversion dam on the upstream surface and the channel is greater than 0.5 m.
8. The ecological diversion pier structure for long-span wading bridges according to claim 1, wherein the distance between the water surface of diversion back of dam and the water surface of pier back of dam and pier is greater than 0.5 and m.
9. An ecological diversion pier structure for long span wading bridges as claimed in claim 1, wherein the downstream ends of the pier dams and diversion dams reach at least 1/3 of the pier length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014536.3A CN114351568B (en) | 2022-01-07 | 2022-01-07 | Ecological diversion pier structure for long-span wading bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014536.3A CN114351568B (en) | 2022-01-07 | 2022-01-07 | Ecological diversion pier structure for long-span wading bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114351568A CN114351568A (en) | 2022-04-15 |
| CN114351568B true CN114351568B (en) | 2024-06-25 |
Family
ID=81106592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210014536.3A Active CN114351568B (en) | 2022-01-07 | 2022-01-07 | Ecological diversion pier structure for long-span wading bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114351568B (en) |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1463847A1 (en) * | 1987-06-29 | 1989-03-07 | Войсковая Часть 13073 | Arrangement for protecting jetty head from water erosion |
| KR100386170B1 (en) * | 2000-07-22 | 2003-06-02 | 주식회사 카보텍 | Scour countermeasure structure facility at Pier-Bonded Type |
| KR200344964Y1 (en) * | 2003-11-21 | 2004-03-11 | 주식회사 선진엔지니어링 종합건축사 사무소 | Pier protection cover for bridge |
| DE202005001801U1 (en) * | 2005-02-01 | 2005-04-14 | Outimex Ag | Roadside crash barrier has a series of hinged sections separating carriageway from irregular array of roadside obstacles |
| KR200406019Y1 (en) * | 2005-11-02 | 2006-01-11 | 주식회사 도우엔지니어즈 | Bridge post structure for preventing scour |
| KR200406809Y1 (en) * | 2005-11-02 | 2006-01-24 | 주식회사 도우엔지니어즈 | Soil Loss Prevention Mechanism |
| KR100642873B1 (en) * | 2006-08-08 | 2006-11-10 | (주)진영이엔씨 | Safety materials for protection of bridge pier |
| KR20080065897A (en) * | 2007-09-18 | 2008-07-15 | 주식회사 거도산업 | Shock absorption stand for a road |
| CN105256784B (en) * | 2015-11-03 | 2017-03-01 | 交通运输部天津水运工程科学研究所 | The combination assembled water conservancy diversion pier structure of U-shaped plate |
| CN206157667U (en) * | 2016-11-11 | 2017-05-10 | 长安大学 | Mountain area skew bridge pier scour prevention buffer stop |
| CN208668251U (en) * | 2017-11-28 | 2019-03-29 | 合肥学院 | A kind of protective device of mountain area bridge pier anti-Rolling Stone and mud-rock-flow-impact |
| CN108330871B (en) * | 2018-02-09 | 2020-07-17 | 重庆交通大学 | Design method of debris flow channel bridge pier protection device |
| KR101967578B1 (en) * | 2018-06-20 | 2019-04-09 | (주)교하엔텍 | Defensive equipment for pier foundation of scour suppress type |
| CN109235371A (en) * | 2018-10-25 | 2019-01-18 | 浙江理工大学 | A kind of assembled bridge pier Anti-scouring device with smooth type baffle |
| CN209722860U (en) * | 2019-03-19 | 2019-12-03 | 浙江水利水电学院 | A kind of y font ecology water conservancy diversion groynes |
| CN110284469A (en) * | 2019-07-26 | 2019-09-27 | 重庆交通大学 | A kind of stilling pond with continuous incidence angle |
| CN111814241A (en) * | 2020-07-14 | 2020-10-23 | 嘉兴金喜莱科技有限公司 | Anti-impact double-cavity opposite-impact dissipation structure for bridge engineering and design method |
| CN215252266U (en) * | 2020-11-13 | 2021-12-21 | 浙江水利水电学院 | V-shaped pier front anti-scouring device |
| CN112853945B (en) * | 2021-03-12 | 2022-08-19 | 潘英杰 | Composite pier scour prevention construction method |
-
2022
- 2022-01-07 CN CN202210014536.3A patent/CN114351568B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 用拦砂坝防护桥墩基础;赵振春;铁道建筑;19860220(第02期);全文 * |
| 采用拦沙坝防护的浅基桥梁墩台局部冲刷研究;伊廷军;吴清波;赵海镜;;水土保持研究;20080615(第03期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114351568A (en) | 2022-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107988999B (en) | Hydrodynamic self-lifting hydro-fluctuation belt wetland ecological management system and construction method thereof | |
| Smith | Types of marine concrete structures | |
| Burcharth et al. | Types and functions of coastal structures | |
| CN114351568B (en) | Ecological diversion pier structure for long-span wading bridge | |
| CN113065768A (en) | River bank protection building technical condition evaluation method based on multi-source multi-dimensional indexes | |
| Tuthill | Structural ice control: Review of existing methods | |
| CN201362839Y (en) | Lifting retaining wall structure for inland river | |
| CN107938592B (en) | Ecological transformation structure of linear type urban river | |
| CN214737767U (en) | High-pile beam-slab wharf structure with rear support piles | |
| Tayade et al. | Importance of Location & Alignment of geotextile tubes for the coastal protection measures | |
| CN111893943A (en) | Semi-submersible type layered erosion-proof silt-promoting device | |
| CN218712673U (en) | Open type ribbed pile foundation spur dike structure | |
| CN212533945U (en) | River edge beach fish habitat structure | |
| CN216999529U (en) | Combined wharf structure suitable for cold area river | |
| Sadeghi et al. | An introduction to onshore structures’ construction | |
| CN218116319U (en) | Ecological cavity block body on slope top | |
| CN216999884U (en) | Protection device for be used for weakening local scour of pier foundation | |
| CN214656752U (en) | Floating breakwater | |
| CN111549723A (en) | River beach fish habitat structure and construction method thereof | |
| Colson | Notes on docks and dock construction | |
| Sistermans et al. | Western scheldt estuary (the netherlands) | |
| CN115387206A (en) | Flexible box type grid pier bottom protection structure | |
| JP3619953B2 (en) | River structure using composite pile for river structure and back split levee using the river structure | |
| CN115506307A (en) | Coastal port protects end scour prevention structure | |
| CN115897377A (en) | Ecological pier structure that protects based on protection stake crowd and fish nest brick |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |