CN104264626A - Structure for controlling and guiding river regime and stabilizing river mainstream - Google Patents

Abstract

The invention discloses a structure for controlling and guiding the river regime and stabilizing the mainstream of the river course, comprising: a double-row serial pile pier group composed of a plurality of pile pier structures arranged along the mainstream position of the river center; wherein, the double-row serial piles The pier group is a group of two pier structures, and several groups are arranged in series. The structure disclosed in the present invention, through the three-dimensional interaction between the pile group and the water flow in the main channel of the river channel, locally scours the riverbed around the pile group, further deepens and stabilizes the deep flow line of the river channel, and guides more water flow to follow the deep flow of the river channel , so as to be far away from important protection areas on the river bank or in the river channel, and realize the control of the river regime and the stability of the mainstream of the river channel.

Description

A structure that controls and guides the river regime and stabilizes the mainstream of the river course

technical field

The invention relates to the technical field of water conservancy engineering, in particular to a structure for controlling and guiding the river regime and stabilizing the mainstream of the river course.

Background technique

In order to stabilize the river regime and ensure the safety of both banks, river revetment control and regulation measures are often used in river regulation projects. At present, the commonly used river regime control engineering is to set up slope protection, bank revetment, spur dike and other hydraulic structures near the embankment or in the shoal area of the river, and control the river regime through the control and guidance engineering on both sides of the river. For rivers with dikes, hydraulic structures such as slope protection, bank revetment, spur dam and other hydraulic structures are used to form the beach protection and control project, and the regulation mode of "protecting the bend with the dam and diverting the flow with the bend" is adopted, mainly using water retaining, deflecting flow, beam narrowing, etc. Control and guide water flow such as over-current, use bank protection and guide engineering to change the flow direction of the river, control and guide water flow, stabilize the river regime and protect the bank, so as to protect the key areas in the river bank or channel. Practice has proved that in rivers with strong river bed stability, traditional technology can directly and effectively control the river regime. The successful application of bank revetment control and guidance measures in dangerous construction projects has improved the functional effectiveness of river control projects and effectively protected the stability of river banks and the safety of flood embankments.

However, for rivers with frequent floods and poor anti-scourability of the river bed, the erosion and scour of the river bank by the water flow is extremely prominent, often causing the river bank to collapse and the mainstream to slip away and the river regime to change, resulting in the passive situation of frequent rescue of dam bank projects and endangering the embankment And the safety of towns and villages often bring serious disasters and huge economic losses to the people's production and life in coastal areas. In Xinjiang, the dikes on both sides of some wandering rivers are very weak, or even have no dikes. How to stabilize the mainstream is a technical problem that needs to be solved urgently.

Contents of the invention

The purpose of the present invention is to provide a structure for controlling and guiding the river regime and stabilizing the mainstream of the river channel. Through the three-dimensional interaction between the pile group and the water flow in the main channel of the river channel, the riverbed around the pile group will be locally scoured, and the river channel will be further deepened and stabilized. The Shenhong line guides more water flow along the deep river channel, so as to stay away from the important protection areas in the river bank or in the river channel, and realize the control of the river regime and the stability of the mainstream of the river channel.

The purpose of the present invention is achieved through the following technical solutions:

A structure that controls and guides the river regime and stabilizes the mainstream of the river, including:

A double-row tandem pier group composed of multiple pier structures arranged along the mainstream position of the river center;

Wherein, the double-row tandem pier group is a structure in which two pier structures form a group, and several groups are arranged in series.

It can be seen from the above-mentioned technical solution provided by the present invention that by arranging a double-row serial pile pier group at the mainstream position of the river center, for a river bed with a wide river beach and an unstable mainstream, the continuous series of pile piers and water flow can be used to counteract the riverbed. The shaping effect of the terrain, forming continuous scour pits along the downstream direction to stabilize the depth line of the river channel through the pier group to strengthen the control of the mainstream, and reshaping the riverbed topography to form continuous scour pits to stabilize the depth of the river channel The position of the Hong line can strengthen the control and guidance of the mainstream, improve the flow and sediment transport capacity of the main channel, and reduce sediment deposition, so as to effectively control the flow path of the mainstream of the wandering river, and realize the control of the river regime and the mainstream of the river. of stability.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is a schematic diagram of a structure for controlling and guiding the river regime and stabilizing the mainstream of the river course provided by the embodiment of the present invention;

Fig. 2 is a schematic plan layout diagram of a structure for controlling and guiding the river regime and stabilizing the mainstream of the river provided by the embodiment of the present invention;

Fig. 3 is the schematic diagram of the drawing depth of 20 pier structures in the double-row tandem pile group test provided by the embodiment of the present invention;

Fig. 4 is a longitudinal cross-sectional view of the center line of the double-row tandem pile group test provided by the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The scheme of the embodiment of the present invention focuses on the river pile piers causing water to scour the local riverbed, brushing the deep main groove to guide the mainstream, and using the interaction between multiple piles and water flow to cause continuous scour pits formed by riverbed scour, thereby increasing the depth of the river. Hong point water depth. The erosion of piles and piers in the river channel is the result of the interaction between water flow and the riverbed. Buildings such as piles and foundation piles change the local water flow movement structure, and the riverbed will deform within a certain range around the buildings, resulting in erosion.

For riverbeds with wide riverbanks and unstable mainstreams, continuous scouring pits are formed along the downstream direction to stabilize the depth line of the river by using the continuous series of pile piers and the water flow to shape the topography of the riverbed. Control and guide the mainstream, and reshape the riverbed topography to form continuous scour pits to stabilize the position of the deep flow line of the river, to strengthen the control and guide to the mainstream, improve the flow and sediment transport capacity of the main channel, and reduce sediment Sedimentation, so as to effectively control the flow path of the wandering river mainstream.

When the water flow passes through the pile pier, the cross section of the water flow is necked, and the water surface of the incoming flow at the top flush of the pile pier generates local elevation and local pressure increase, and a downward flow scours the river bed at the front of the pile facing the water. At the same time, the water flow turns around the center of the channel along the column surface, and the flow velocity on the cross-section is distorted, resulting in a strong shearing effect, resulting in a series of horseshoe-shaped vortices. When the water flow bypasses the two sides of the cylinder and separates, it continuously releases the wake vortex. These complex vortex structures lead to strong pulsation of water flow, which scours the bed surface sediment near the bridge abutment, and the raised bed sand is carried away by the vortex, eventually forming a local scour pit near the pier.

In addition, the left and right arrangement of the double row of piles utilizes the interaction between the two rows of piles to deepen and stabilize the scour pit between the piles. The front and rear arrangement in series along the water flow direction enables the water flow to continuously interact with the pile piers, and connect the scour pits formed by the front and rear piles together to form the mainstream deep flow line.

Example

Fig. 1 is a schematic diagram of a structure for controlling and guiding the river regime and stabilizing the mainstream of the river provided by the embodiment of the present invention. As shown in Figure 1, the structure mainly includes:

A double-row tandem pier group composed of multiple pier structures arranged along the mainstream position of the river center;

Wherein, the double-row tandem pier group is a structure in which two pier structures form a group, and several groups are arranged in series.

Further, the distance between two pier structures in each group is 3D to 6D, and the distance between groups arranged in series is 4D to 8D; said D represents the diameter or diagonal length of the pier structure.

Further, the cross-sectional form of the pier structure includes: circular, square or rectangular.

Further, the fixing methods of the pile pier structure include: deep-buried, shallow-buried, and suspended flow-disrupting.

Further, the pier structure is composed of plastic, bamboo, wood, concrete piles and/or iron.

In order to facilitate a further understanding of the present invention, further description will be made below in conjunction with accompanying drawings 2-4.

In the embodiment of the present invention, the main characteristic form of the double-row tandem pile pier group is the form of a double-row tandem permeable building. The pile pier group is arranged at a certain interval in the mainstream position of the river center, and the deep pile group is brushed by the water flow. The local riverbed forms a stable scour zone, which promotes more water flow into the channel, stabilizes the direction of the mainstream, and reduces the swing of the mainstream in the channel.

As shown in Figure 2, the double-row serial pile pier group is set along the mainstream position of the river center, and the double-row serial pile pier group is a group of two pile pier structures, and several groups are arranged in series (Figure 2 The numbers in are for convenience only, and can be set according to actual conditions in actual work).

In the embodiment of the present invention, the diameter (or diagonal length) D of a single pier structure can be set at 1-2 m in consideration of site construction and structural strength. According to the results of model tests, if the distance between piles is too large, the scour pits will be independent and it will be difficult to form a band-shaped scour; if the distance between piles is too small, the flow rate of water between the piles will be greatly resisted, and the scouring effect will also be unsatisfactory. The distance between two pier structures in each group is 3D-6D, and the distance between groups arranged in series is 4D-8D.

In addition, under natural conditions, the river boundary is not straight, and the mainstream direction is also curved downward along the river. Therefore, in actual construction, it can be arranged smoothly according to the winding direction of the natural mainstream.

The cross-sectional shape of a single pier structure can be circular, square or rectangular. Normally, a circular shape can be used. On the one hand, it can reduce the energy loss in the local water flow, which is conducive to the smooth passage of the water flow through the pile group and reduces the impact of the water flow on the pile body. On the other hand, from the manufacturing process of the pile itself, the pile The body itself is also better in terms of tensile, compressive, shearing and deformation resistance.

The material of the pile pier structure is generally concrete as the main material, and other materials can also be used. The optional pile body materials include plastic piles, bamboo piles, wooden piles, concrete piles, iron piles, etc. In actual construction, prefabricated or cast concrete piles can be directly inserted into the depths of the riverbed by drilling, vibration, hydraulic punching and other techniques.

According to the fixing method of the pile pier structure in the river channel, the form of piles can be divided into several forms such as deep buried piles, shallow buried piles, and suspended spoiler piles. Deep-buried piles are fixed on the riverbed surface through drilling or piling on the riverbed, and its structural stability mainly depends on the foundation depth of the piles. Suspension spoiler piles are piles suspended in the water flow, and the bottom and the bed surface are not connected in a fixed way, but are connected to other fixed buildings through the part of the upper part of the pile exposed to the water. The shallow buried pile is between the two, the bottom is fixed by a shallower buried depth, and the upper part is fixedly connected like a spoiler pile.

According to the scouring effect demonstration of the sediment physical model, the double-row tandem piles should be in the form of deep buried piles, and the piles above the bed surface can be high piles exposed to the water surface, or submerged piles with the pile tops below the water surface.

On the other hand, in order to verify the structure for controlling and guiding the river regime and stabilizing the mainstream of the river channel provided by this embodiment, experiments were carried out. In this test, the sediment physical model test technique was used to demonstrate the scour effect of the double-row serial pile group. According to the principle of model similarity design, the normal series of sediment model tests are adopted. The series model is a method to obtain test results through extension by using dissimilar models of sediment movement. Similar tests are obtained by using a series of models that are not completely similar. The method is to predict the scour pit near the bed surface by extending the series of model test results with the help of normal series models of different scales. The tests follow the "River Model Test Regulations" SL99-2012 and "Hydraulic (Conventional) Model Test Regulations" SL155-2012.

The influencing factors considered in this test plan include the distance between the pile and pier structures, the depth of the pile and pier structures (including deep buried piles, shallow buried piles and suspended disturbance piles), and the arrangement of pile groups, etc. See Table 1 for details:

According to the test results of each scheme, the following conclusions were drawn:

(1) Suspension disturbance, shallow burial and deep burial are all three pier arrangements that can cause changes in local water flow, and the effect of local scouring of bed surface sediment is the strongest with deep burial piles, followed by shallow burial piles, and suspension piles are the most effective. weak.

(2) Through experiments on different pile distances and water flow conditions, the model shows that when the natural flow velocity is 1.8m/s and the distance between piles is 4 times the pile diameter, the scour pit formed between the upstream and downstream pile piers of the tandem piles can be They are connected into strip-shaped scour grooves, which play the role of partially brushing deep main grooves, returning to and stabilizing the mainstream. However, due to the disturbance and shading effect of the upstream piles, when the inflow angle between the water flow and the tandem piles is zero, a band-shaped scour groove is formed near the upstream part of the tandem piles, and the scour intensity near the downstream pier is obviously weakened.

(3) Judging from the scouring effects of different arrangements, the effect of double-row tandem piles (Scheme 5) is better than that of single-row tandem piles (Scheme 4), and it is recommended to adopt the form of double-row piles in the prototype control and guidance test.

The test results in the above scheme 5 are shown in Figure 3-4, and Figure 3 is a schematic diagram of the depth of the 20 pile pier structure; among them, the A and B piles are the left row and the right row of tandem piles arranged along the direction of the river, respectively ; Figure 4 is a longitudinal section of the center line.

The embodiment of the present invention is based on the idea of guiding the water flow to automatically concentrate the water flow by brushing the deep deep in the main river channel, and uses the double-row serial pile pier group buildings to actively adjust and change the flow state of the flood, and through the The buildings of serial piles and pier groups brush the local riverbed, return to the mainstream, stabilize the deep flow line of the main river, guide the evolution of the river away from the important industrial and living areas along the coast, and protect the normal production and life of the people in the coastal areas. A new way of thinking and a new approach to governance.

In addition, the technology of controlling and directing the main flow of the double-row tandem pile pier group is different from the control and guidance project of the traditional solid dam. It is a new idea and new method to actively guide and control the evolution of the river regime by using the pile pier structure to change the flow state of the flood. The double-row tandem pile pier group has the advantages of one-time repair, no emergency rescue, and the use of water flow and sediment interaction to control and guide the river regime. At the same time, it has the advantages of simple structure, high degree of construction mechanization, safe and reliable operation, no emergency defense, and less land occupation. Advantages, to a certain extent, can make up for the shortcomings of passive protection of traditional river improvement projects.

To a certain extent, this technology fills the gap in the study of pile groups stabilizing the mainstream and controlling river regime, and has great application and promotion value.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (5)

1. A structure for controlling and guiding the river regime and stabilizing the mainstream of the river course, characterized in that it comprises: A double-row tandem pier group composed of multiple pier structures arranged along the mainstream position of the river center; Wherein, the double-row tandem pier group is a structure in which two pier structures form a group, and several groups are arranged in series. 2. The structure according to claim 1, characterized in that, the spacing between the two pier structures in each group is 3D to 6D, and the spacing between groups arranged in series is 4D to 8D; the D Indicates the diameter or diagonal length of the pier structure. 3. The structure according to claim 1 or 2, characterized in that, the cross-sectional shape of the pier structure includes: circular, square or rectangular. 4. The structure according to claim 1 or 2, characterized in that the fixing methods of the pier structure include: deep-buried, shallow-buried, suspended flow-disrupting. 5. The structure according to claim 1 or 2, wherein the pier structure is composed of plastic, bamboo, wood, concrete piles and/or iron.