An energy dissipation and scour prevention structure for the water outlet of an open pipe diversion involved in urban river channel construction

Abstract

The present invention provides an energy dissipation and anti-scour structure for the water outlet of urban river channel construction with open pipe diversion, which includes an energy dissipation box, an anti-scour bottom protection, and an energy dissipation box fixing platform for supporting the energy dissipation box upward, arranged in sequence along the flow direction; the energy dissipation box is composed of a bottom plate, two side walls and a rear baffle, a water guiding pipe is arranged on the rear baffle, the water guiding pipe is communicated with the inner space of the energy dissipation box, and a plurality of energy dissipation teeth are arranged on the bottom plate; a weir height energy dissipation part is arranged on the bottom plate near the anti-scour bottom protection side, and the weir height energy dissipation part is used to enhance the energy dissipation effect of the energy dissipation box on the water flow. In the present invention, a plurality of energy dissipation teeth are arranged on the bottom plate of the energy dissipation box to assist in energy dissipation, and a weir height energy dissipation part is arranged on the bottom plate near the anti-scour bottom protection side to generate hydraulic jump energy dissipation, which can jointly enhance the energy dissipation effect of the energy dissipation box on the water flow. At the same time, the channels formed by the energy dissipation teeth are beneficial to extending the path of the water flow, so as to achieve a better hydraulic energy dissipation effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy dissipation and erosion prevention for river channels, and particularly relates to an energy dissipation and erosion prevention structure for the water outlet of open pipeline diversion in urban river channel construction. Background Art

[0002] Currently, a large number of municipal, water conservancy, and river regulation projects involve occupying urban river channels for construction. Generally, urban river channels shoulder one or more functions such as flood control, ecological functions, and urban landscapes. When occupying the river channel for construction, in order to create dry construction conditions, enclosure measures such as cofferdams are required to isolate the construction area from the river water body. When using full-section cofferdam construction, in order to ensure the safety of the enclosure structure in the construction area and at the same time minimize the impact of river-crossing construction on the river channel functions, it is necessary to adopt construction diversion to guide the river water flow around the construction site through a predetermined method to the downstream. The selection of the diversion plan is related to the construction period, quality, cost, and safe flood passing of the entire project construction, and a careful design needs to be made in advance. In view of the relatively narrow urban river channels, the lack of open channel diversion conditions on both sides of the river channels, the small flow rate of the culvert diversion under the cofferdam and the impact on construction, etc., using a temporary pumping station plus open pipeline laid on the shore for diversion is one of the common diversion methods for urban river channel construction. The cross-sectional area of the pipeline for water flow is relatively small compared with that of the river channel. Under the condition of passing the same flow rate, the water flow velocity at the water outlet of the pressure pipeline is high and the kinetic energy is large, which is extremely easy to cause scouring of the riverbed and even lead to instability and collapse of the river bank slope. The scouring of the river channel by the water flow at the water outlet of the pressure pipeline and the energy dissipation of the water flow are important factors to be considered during the diversion period of urban river channel construction. Most urban river channels are narrow and shallow, and there is a relatively thick layer of silt on the riverbed. The conventional stilling basin structure requires creating dry construction conditions, with extremely high construction difficulty and time-consuming and laborious; adding an energy dissipation valve at the water outlet can better solve the problem of water flow energy dissipation at the water outlet, but the large-diameter conical valve is expensive.

[0003] Therefore, it is necessary to provide an energy dissipation and erosion prevention structure for the water outlet of open pipeline diversion in urban river channel construction. In particular, if an energy dissipation and erosion prevention structure can be made by combining the available engineering materials on site and installed quickly and conveniently using the on-site mechanical equipment, it would be better for the energy dissipation and erosion prevention at the water outlet position of the open pipeline diversion. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy dissipation and erosion prevention structure for the water outlet of open pipeline diversion in urban river channel construction in view of the deficiencies in the prior art.

[0005] For this purpose, the above object of the present invention is achieved through the following technical solutions:

[0006] An energy dissipation and erosion prevention structure for the water outlet of open pipeline diversion in urban river channel construction, including an energy dissipation box, an erosion prevention bottom protection, and an energy dissipation box fixing platform for upwardly supporting the energy dissipation box, which are arranged in sequence along the flow direction; the erosion prevention bottom protection is used to protect the river bottom;

[0007] The energy dissipation box is composed of a bottom plate, two side walls and a rear baffle, the rear baffle is provided with a diversion water pipe, the diversion water pipe is connected to the space inside the energy dissipation box, and the bottom plate is provided with a plurality of energy dissipation teeth; the bottom plate is provided with a high-rise energy dissipation part near the bottom side of the anti-impact protection, and the high-rise energy dissipation part is used to enhance the energy dissipation effect of the energy dissipation box on the water flow;

[0008] The channel formed by any two adjacent energy dissipation teeth on one side of the axis along the water flow direction in the energy dissipation box faces the side wall of the energy dissipation box and makes the water flow entering the channel formed by the energy dissipation teeth dispersed relative to the upstream.

[0009] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0010] As a preferred technical solution of the present invention: a plurality of energy dissipation teeth are symmetrically arranged along the axis of the water flow direction in the energy dissipation box, and the openings formed by the energy dissipation teeth on both sides of the axis face the direction of the downstream anti-impact bottom protection.

[0011] As a preferred technical solution of the present invention: the energy dissipation teeth are welded to the bottom plate using on-site steel plate scraps to enhance the energy dissipation effect of the energy dissipation box on the water flow.

[0012] As a preferred technical solution of the present invention: an internal support structure is provided between the side wall and the bottom plate, and the internal support structure is an angle steel, which is welded to the side wall and the bottom plate respectively to enhance the rigidity of the overall structure of the energy dissipation box.

[0013] As a preferred technical solution of the present invention: the energy dissipation box fixed platform is composed of steel columns, steel main beams, and steel secondary beams;

[0014] The main steel beam and the secondary steel beam form a frame to support the bottom plate of the energy dissipation box upwards;

[0015] The upper end of the steel column is welded to the steel main beam, and the lower end of the steel column is driven into the river bottom.

[0016] As a preferred technical solution of the present invention: the steel columns, steel main beams and steel secondary beams are made of I-beams or channel steels.

[0017] As a preferred technical solution of the present invention: the anti-scouring bottom protection includes a plurality of flat steel cages and filling stones arranged in the steel cages, which are used to prevent the residual energy of the water flow after passing through the energy dissipation box from flushing the river bottom.

[0018] As a preferred technical solution of the present invention: the energy dissipation part is an upwardly inclined bottom plate end or an upwardly inclined steel plate, which is used to increase the water level in the energy dissipation box to form a water jump and enhance the energy dissipation effect.

[0019] The present invention provides an energy dissipation and scouring prevention structure for the water outlet of an open pipe diversion in urban river channel construction. Compared with the prior art, it has the following beneficial effects:

[0020] (1). A plurality of energy dissipation teeth are provided on the bottom plate of the energy dissipation box to assist in energy dissipation, and a backwater energy dissipation part is arranged on the bottom plate near the scouring prevention bottom protection side to generate hydraulic jump energy dissipation, which can jointly enhance the energy dissipation effect of the energy dissipation box on the water flow. At the same time, the channels formed by the energy dissipation teeth are beneficial to extending the path of the water flow, thereby achieving a better hydraulic energy dissipation effect;

[0021] (2). A scouring prevention bottom protection with a gabion is laid on the downstream side of the energy dissipation box to protect the river bottom and avoid the scouring of the remaining energy of the water flow on the river bottom;

[0022] (3). In addition, the energy dissipation teeth can be made of on-site steel plate scraps and welded to the bottom plate. The on-site I-beams and channel steels are used as the steel column, main steel beam, and secondary steel beam structures, and the steel column is driven into the river bottom by using on-site construction machinery, which can quickly and conveniently manufacture the support platform of the energy dissipation box. The energy dissipation box can also be made by welding steel plates, making full use of the existing materials on site, replacing the conventional stilling basin structure or energy dissipation valve, and can operate with water, avoiding the problems of the need for dry land construction of the conventional stilling basin and the high cost of the energy dissipation valve. Description of the Drawings

[0023] Figure 1 is the top view of the energy dissipation and scouring prevention structure for the water outlet of the open pipe diversion in urban river channel construction provided by the present invention;

[0024] Figure 2 is Figure 1 the cross-sectional view in the A-A direction in

[0025] Figure 3 is Figure 1 the cross-sectional view in the B-B direction in

[0026] Figure 4 is Figure 1 the cross-sectional view in the C-C direction in

[0027] In the figure: 1-bottom plate; 2-side wall; 3-energy dissipation tooth; 4-back baffle; 5-internal support structure of the box; 6-main steel beam; 7-secondary steel beam; 8-steel column; 9-scouring prevention bottom protection; 10-water diversion pipe. Detailed Embodiments

[0028] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0029] Such as Figures 1 to 4As shown in the figure, the energy dissipation and anti-scour structure at the water outlet of the open-channel diversion for river-related construction mainly includes a bottom plate 1, two side walls 2, energy dissipation teeth 3, a rear baffle 4, an internal support structure 5 in the box, a main steel beam 6, a secondary steel beam 7, a steel column 8, and an anti-scour stone cage 9.

[0030] Specifically, the energy dissipation and anti-scour structure at the water outlet of the open-channel diversion for river-related construction includes three parts, namely, an energy dissipation box, a fixed platform for the energy dissipation box, and an anti-scour bottom protection.

[0031] The energy dissipation box is composed of a bottom plate 1, side walls 2, a rear baffle 4, an internal support structure 5 in the box, and energy dissipation teeth 3. Its dimensions L1 and B1 are determined according to hydraulic energy dissipation calculations; the fixed platform for the energy dissipation box is composed of steel columns 8, a main steel beam 6, and a secondary steel beam 7, and is used to support the energy dissipation box; the anti-scour bottom protection 9 is composed of multiple flat-laid anti-scour stone cages (steel bar cages and filling stones arranged inside the steel bar cages), and is used to protect the river bottom. A water diversion pipe 10 is provided on the rear baffle 4. Multiple energy dissipation teeth 3 are symmetrically arranged along the axis in the water flow direction inside the energy dissipation box, and the openings formed by the energy dissipation teeth 3 on both sides of the axis face the direction of the downstream side anti-scour bottom protection 9. The channels formed by any two adjacent energy dissipation teeth 3 on one side of the axis along the water flow direction inside the energy dissipation box are inclined towards the side wall on the downstream side of the energy dissipation box.

[0032] The bottom plate 1, side walls 2, and rear baffle 4 are made of steel plates with a thickness greater than 1 cm and welded into a box structure; the internal support structure 5 in the box is made of angle steel or steel, and its two ends are respectively welded to the side walls 2 and the bottom plate 4 to enhance the overall stiffness of the box structure; the energy dissipation teeth 3 are made of on-site steel plate scraps and welded to the bottom plate 1 to assist in enhancing the water energy dissipation inside the energy dissipation box.

[0033] The end of the bottom plate 1 is processed into an upward-sloping ramp or a section of steel plate is welded obliquely to form a water-raising energy dissipation part, which is used to raise the water level inside the energy dissipation box, facilitate the formation of a hydraulic jump, and enhance the energy dissipation effect.

[0034] The steel columns 8 are selected from I-beams or channel steels in combination with on-site available materials, and are driven into the river bottom to a certain depth by on-site construction machinery. The steel section specifications and driving depth are determined according to structural stability calculations; the main steel beam 7 and secondary steel beam 6 are selected from I-beams or channel steels in combination with on-site available materials, and the steel section specifications are determined according to structural stability calculations; the main steel beam 6 is welded to the steel column 8, and the secondary steel beam 6 is welded to the main steel beam 7.

[0035] The anti-scour bottom protection 9 can be made by welding on-site steel bars into cages and filling them with stones, or by purchasing alloy mesh bags filled with stones, and is hoisted and placed at the designated position on the river bottom to prevent the remaining energy of the water flow after passing through the energy dissipation box from scouring the river bottom. Its laying range L2 and B2 are determined according to hydraulic anti-scour calculations.

[0036] The above-mentioned energy dissipation and anti-scour structure at the water outlet of the open-channel diversion for river-related construction is implemented through the following steps:

[0037] (1), Driving in the steel column 8;

[0038] (2), Welding the steel main beam 7 to the steel column 8, and welding the secondary beam 6 to the steel main beam 7;

[0039] (3), Laying the bottom plate 1 and welding it firmly to the edge secondary beam 6;

[0040] (4), Welding the side wall 2 and the rear baffle 4 on the bottom plate 1;

[0041] (5), Welding the internal support structure 5 of the box between the bottom plate 1 and the side wall 2;

[0042] (6), Welding the energy dissipation teeth 3 on the bottom plate 1;

[0043] (7), Lifting and placing the anti - impact bottom protection 9;

[0044] (8), Using it after filling with water.

[0045] The above - mentioned specific implementation manners are used to explain and illustrate the present invention, which are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the protection of the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An energy dissipation and erosion prevention structure for the water outlet of an open pipe diversion in urban river channel construction, characterized in that: The outlet energy dissipation and anti-impact structure comprises an energy dissipation box, an anti-impact bottom protection, and an energy dissipation box fixing platform for supporting the energy dissipation box upwards, which are sequentially arranged along the flow direction; The energy dissipation box is composed of a bottom plate, two side walls and a rear baffle, the rear baffle is provided with a diversion water pipe, the diversion water pipe is connected to the space inside the energy dissipation box, and the bottom plate is provided with a plurality of energy dissipation teeth; the bottom plate is provided with a high-rise energy dissipation part near the bottom side of the anti-impact protection, and the high-rise energy dissipation part is used to enhance the energy dissipation effect of the energy dissipation box on the water flow; The channel formed by any two adjacent energy dissipation teeth on one side of the axis along the water flow direction in the energy dissipation box faces the side wall of the energy dissipation box and makes the water flow entering the channel formed by the energy dissipation teeth dispersed relative to the upstream.

2. The energy dissipation and erosion prevention structure of the water outlet for the open pipe diversion in the urban river channel construction according to claim 1, wherein: The energy dissipation teeth are welded to the bottom plate using on-site steel plate scraps.

3. The energy dissipation and erosion prevention structure of the water outlet for the open pipe diversion in the urban river channel construction according to claim 1, characterized in that: An inner box support structure is provided between the side wall and the bottom plate, and the inner box support structure is an angle steel.

4. The energy dissipation and erosion prevention structure of the water outlet for the open pipe diversion in the urban river channel construction according to claim 1, characterized in that: The energy dissipation box fixed platform is composed of steel columns, steel main beams, and steel secondary beams; The main steel beam and the secondary steel beam form a frame to support the bottom plate of the energy dissipation box upwards; The upper end of the steel column is welded to the steel main beam, and the lower end of the steel column is driven into the river bottom.

5. The energy dissipation and scour prevention structure for the water outlet of the open pipe diversion in the urban river channel construction according to claim 4, characterized in that: The steel columns, steel main beams and steel secondary beams are made of I-beams or channel steels.

6. The energy dissipation and erosion prevention structure for the water outlet of the open pipe diversion in the urban river channel construction according to claim 1, characterized in that: The anti-impact bottom protection comprises a plurality of flat steel cages and filling stones arranged in the steel cages.

7. The energy dissipation and erosion prevention structure for the water outlet of the open pipe diversion in the urban river channel construction according to claim 1, characterized in that: The energy dissipation portion is an upwardly inclined bottom plate end or an upwardly inclined steel plate.

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