CN102561260A - Water-permeable waterway improvement spur dike - Google Patents

Abstract

The invention discloses a permeable river channel regulating spur. One end of the spur is connected with the river bank, and the other end extends to the river channel, and is connected with the river bank in a T-shape on the plane. Each permeable frame unit is hollow in the middle; each group of permeable frame units forms a permeable frame group, and prefabricated panels are arranged between each permeable frame group. The present invention uses the permeable frame to pile up the dam body and makes full use of the "decelerating and silting-promoting" effect of the permeable frame, so that the water flow structure flowing through the frame is destroyed, the flow velocity at the bottom of the permeable frame group is significantly reduced, and the sediment contained in the water body is silted , the dam body is gradually silted; on the basis of the new silt, a new bottom is formed, and sediment is gradually deposited. As time goes on, the diversion effect of the spur dike becomes more and more obvious. The invention has the remarkable advantages of high stability, good control effect, good for flood relief, low maintenance cost and reduced engineering investment in the event of flood, and is favorable for popularization and use.

Description

A permeable river regulation spur dam

technical field

The invention relates to a river course building, in particular to a permeable river course regulation spur dam.

Background technique

Spur dam is a protruding fluid protruding from the bank of the river, which forms a T-shape with the shoreline on the plane. It is the most commonly used hydraulic structure in channel regulation, river regulation, and coastal protection projects. In river channel management and coastal protection, spur dikes protect river banks from erosion by deflecting and diverting flow; in waterway regulation, spur dikes can narrow riverbeds, adjust water flow structure and protect banks from erosion. Specifically, the plan view of a conventional spur dike is shown in Figure 1. The spur dike consists of three parts: the head 1, the body 2 and the root 3. The head 1 extends to the river channel, and the root 3 is connected to the river bank. The whole spur dike is on the plane T-shaped.

There are many types of spur spurs, which can be divided into ordinary spur spurs, Goutou spur spurs and T-shaped spur dikes according to the plane form; according to the construction materials, they can be divided into block stone spur spurs, concrete spur spurs, riprap spur spurs and composite spur spurs. The spur dam body generally has a trapezoidal cross-section. Since the water flow at the head of the dam is turbulent, it bears high hydrodynamic pressure and generates a spiral flow bypassing the head of the dam. Generally, the width of the dam body at the head of the dam is increased during design. 1 The plane is arranged as a smooth curve, and the slope of the dam head 1 extending to the river bed is relatively gentle.

After the spur dike is installed in the river channel, the river channel will be narrow. When the water is moderately dry, the flow area will be reduced, the flow rate will increase, and the original river bed will be scoured, so as to achieve the effect of "bundling water to attack sand", and then meet the requirements of channel regulation. During the later operation of the spur dam, since the dam body 2 does not pass through the water, the water flow generates a vertical velocity in the upstream of the dam body 2, and the water flow forms a circulation in the upper and upper reaches of the dam, scouring the riverbed at the bottom of the dam body, and endangering the safety of the dam body after the dam foot is suspended; Near the head 1, due to the high velocity of the water flow, the water flow around the dam forms a spiral flow near the bed surface, and a scour pit is formed near the head 1, which causes a rock at the head of the dam to collapse, which in turn causes damage to the entire spur dam, requiring a large amount of maintenance work ,costly. In addition, when floods occur in the river course, due to the water blocking effect of spur dikes, the overall flood discharge capacity of the river course is greatly affected, the upstream water level is obviously high, and the flood control pressure of the river course increases. Therefore, while spur dike "bunching water and attacking sand" satisfies waterway regulation, it also brings higher maintenance costs in the later stage, and at the same time has a great impact on the flood discharge capacity of the river, which endangers the flood control safety of the river.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art and to solve the problems of conventional spur dikes that are prone to collapse, large engineering volume, and impact on flood discharge, the present invention provides a new type of permeable river channel regulation spur dike.

Technical solution: In order to achieve the above purpose, one end of a permeable river regulation spur dam of the present invention is connected to the river bank, and the other end extends to the river channel, and is connected to the river bank in a T-shape on the plane. Each permeable frame unit has a hollow space in the middle; each group of permeable frame units forms a permeable frame group, and prefabricated panels are arranged between each permeable frame group.

The permeable frame unit is composed of six ribs and four vertices. The ribs are ribs made of rigid rod-shaped materials, and the ribs made of rigid rod-shaped materials are connected and fixed at each vertices.

In order to facilitate the installation of multiple permeable frames, the rigid material is a concrete pre-set rod, which is convenient for production and assembly.

Adjust the length of each edge of the permeable frame according to the underwater topography of the project implementation site and the navigation guarantee water level, and the length of the six edges is equal. Usually, the length of each edge is 0.8m to 1.2m.

When the permeable frames are stacked individually, they cross each other to increase the stability of the dam structure, and increase the number of permeable frames stacked at the dam head.

Beneficial effect: compared with the prior art, the present invention has the following advantages:

(1) Reduce project investment: the dam body is formed by stacking the permeable frame alone. When the water flows through the permeable frame, the sediment contained in the water body will silt, and the dam body will gradually silt; on the basis of the new silt, another The new bottom is gradually silted with sediment. As time goes on, the diversion effect of the spur dike becomes more and more obvious, which greatly reduces the amount of work and investment;

(2) The stability is significantly improved: each plane of the permeable frame is a triangular structure, which has structural stability. When stacking, the permeable frames intersect each other to further improve the stability; The vertical flow velocity in the upper reaches of the dam is significantly reduced, and the scour at the bottom of the dam foot is well contained; the disturbance phenomenon at the dam head is not obvious, and the scour depth and the scope of the scour pit downstream of the dam head are significantly reduced, and the scour pit is far away from the dam head. The trend is conducive to the stability of the dam body;

(3) The remediation effect is better, and the later maintenance cost is less;

(4) When there is a flood, it is beneficial for the catharsis of the flood.

Description of drawings

Fig. 1 is the plan view of existing conventional spur dike;

Fig. 2 is a schematic diagram of a single permeable frame in the present invention;

Figure 3 is a schematic diagram of permeable frame binding;

Fig. 4 is the schematic diagram of prefabricated board;

Figure 5 is a schematic cross-sectional view of a permeable spur dam;

Figure 6 is a schematic diagram of the elevation of a permeable spur dam.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 6, one end of a permeable river regulation spur dam of the present invention is connected to the river bank, and the other end extends to the river channel, and is connected to the river bank in a T-shape on the plane. The body 4 is stacked, and the middle of each permeable frame unit 4 is hollow; each group of permeable frame units 4 forms a permeable frame group, and prefabricated panels 5 are arranged between each permeable frame group.

In this embodiment, the permeable frame unit 4 is composed of six ribs 41 and four vertices 42, the ribs 41 are ribs 41 made of rigid rod-shaped materials, and the ribs 41 made of rigid rod-shaped materials are connected and fixed at each vertices 42 . The rigid material is preferably a concrete preset rod, which is convenient for production and assembly. Adjust the length of each edge 41 of the permeable frame monomer 4 according to the underwater topography of the project implementation site and the navigation guarantee water level, and the length of the six edges 41 is equal. When the permeable frame monomers 4 are piled up, they are bound according to the method shown in Figure 3, that is, the edges 41 of every two permeable frame monomers 4 that are adjacent to each other are bound together, thereby increasing the stability of the dam structure. In Figure 3, the position indicated by the letter A is the binding position. Determine the number of lashings according to the width of the bottom of the spur. For example, the proposed spur is 10.8 meters wide, and each edge is 1.2 meters. According to the method shown in Figure 3, 17 permeable frame units 4 are cross-bound to serve as the frame foundation of the bottom of the spur , in the construction project, the cofferdam project should be done around the implementation range of the spur dam first, and the river bed should be properly excavated within the range of the dam axis to facilitate the layout of the permeable frame group. After laying the bottom layer, a flat prefabricated slab 5 is laid on the top of the frame group. As shown in Figure 4, the middle of the prefabricated slab 5 is hollow, and the upper and lower sides do not block the water flow, which is beneficial to the deposition of sediment. After fixing and laying the frame group at the bottom of the spur dam, gradually lay the frame group upwards in the same order to complete the construction of the permeable spur dam. The section shape of the permeable spur dam is trapezoidal, and the number of permeable frame monomers 4 gradually decreases from the bottom to the top, as shown in Figure 5. The schematic diagram of the facade of permeable spur spurs is shown in Figure 6. In the figure, the location indicated by the letter B is the remediation water level, and the location indicated by the letter C is the design water level.

The spur dam of the present invention is composed of a plurality of permeable frame monomers 4 to form a permeable frame group. Due to the "decelerating and silting-promoting" effect of the permeable frame, when the water flow passes through the permeable frame, the water flow structure is destroyed, and the flow velocity at the bottom of the permeable frame group is significantly reduced. The silt contained in the silt falls, and the dam body is gradually silted; on the basis of the new silt, a new bottom is formed, and the sediment is gradually deposited. As time goes on, the diversion effect of the spur dike becomes more and more obvious. In addition, since the dam body is composed of a hollow frame, the water flow can pass through the dam body, the vertical flow velocity upstream of the dam body is significantly reduced, and the bottom scour at the dam foot is well contained; the turbulence phenomenon at the dam head is not obvious, and the dam The scour depth and scour pit range downstream of the head are significantly reduced, and the scour pit tends to be far away from the dam head, which is conducive to the stability of the dam body. When a major flood occurs in the river, due to the permeable spur dike, compared with the traditional spur dike, the flood discharge capacity of the river can be increased, which is beneficial to the flood discharge of the river.

According to the results of the river regulation spur dike model test, the analysis shows that the permeable spur dike of the present invention has the characteristics of high stability and good regulation effect compared with the traditional spur dike. %, the scour pit moves downstream, away from the dam head. There is sediment at the bottom of the hollow frame group.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (4)

1. A permeable type river course improvement spur, this spur one end links to each other with the river bank, and the other end stretches to the river channel, and is connected with the river bank to form a T-shape on the plane, it is characterized in that: the dam body of this spur is composed of several groups of permeable frame monomers ( 4) Stacking structure, each permeable frame unit (4) is hollow in the middle; each group of permeable frame units (4) forms a permeable frame group, and prefabricated panels (5) are arranged between each permeable frame group. 2. The permeable river channel improvement spur dam according to claim 1, characterized in that: the permeable frame monomer (4) is composed of six edges (41) and four vertices (42), and the edges (41) The ribs are made of rigid rod-shaped material, and the ribs (41) made of rigid rod-shaped material are connected and fixed at each apex (42). 3. The permeable river course regulation spur dam according to claim 2, characterized in that: said ribs (41) are concrete pre-set rods. 4. The permeable river channel regulation spur dam according to any one of claims 1 to 3, characterized in that: the six ribs (41) of the permeable frame monomer (4) are of equal length, and the length of each rib (41) It is 0.8m ~ 1.2m.

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