CN211816060U - Top-sealed dredging structure body for river channel dredging experimental research - Google Patents

Abstract

Top seal formula desilting structure body is used in river channel desilting experimental study, desilting structure body lower part longitudinal section be solid trapezoidal, two trapezoidal footing are the acute angle, trapezoidal vertical both sides are the upstream face and the surface of backing a river respectively, desilting structure body upper portion be planar plate body around for, the front and back plane of plate body parallels, seted up a plurality of sand holes that rush to overflow on the plate body, overflow and rush to sand the hole for circular or rectangle or trapezoidal or toper or triangle-shaped. The structure body foundation experimental device is used for carrying out dredging experimental research so as to continuously improve and enrich the research of an active dredging method for dredging silt by using the water body.

Description

Top-sealed dredging structure body for river channel dredging experimental research

Technical Field

The utility model relates to a river channel desilting research model, in particular to top seal formula desilting structure body for river channel desilting experimental study belongs to experimental study model technical field.

Background

The silt sinking phenomenon of different degrees is mostly existed in a plurality of domestic river channels, water diversion channels and urban inland rivers. The most direct influence factor of sediment deposition is the reduction of the sand carrying capacity of water flow, two types of flood discharge and sand discharge (such as small wave bottom hydraulic engineering) and mechanical dredging through hydraulic engineering are gradually formed through long-term practical accumulation in the field of sediment cleaning research, the flood discharge and sand discharge method through the hydraulic engineering is an active dredging method for improving the sand carrying capacity of the water flow, and through research, the applicant provides 'a river channel or channel dredging experiment foundation device' at the beginning in Chinese patent application No. 2020202027531 (the name is a river channel or channel dredging experiment foundation device). The dredging experiment foundation device only provides a convenient foundation condition for vast students in dredging experiment research, does not contain a specific dredging structure body, needs to continuously enrich the content of the research field by virtue of the creativity of the vast researchers, provides reference for experimental research of the researchers in the field, and researches a plurality of dredging structure bodies by a research team of the applicant. The applicant has carried out initial experimental research on the series of structures, and an experimental group has obviously higher dredging influence than a control group, and the determination of parameters is an optimal value or range obtained by a series of experimental researches because the engineering practice of the structural model relates to the determination of each specific parameter of a project body. Therefore, the model body provided by the application only relates to the field of experimental research for the moment, and provides scientific guidance for practical application of the engineering structure body through later systematic experimental research. The determination of the optimal parameter value or range of the structure and the scientific research of other dredging structure models are awaited by the common scholars in the future.

Disclosure of Invention

The utility model aims to provide a supporting desilting structure body with it on foretell river course or channel desilting experiment foundation equipment's research and development basis, can be further be used for the experimental research of desilting.

In order to realize the purpose of the utility model, the following technical proposal is adopted: top seal formula desilting structure body is used in river channel desilting experimental study, desilting structure body lower part longitudinal section be solid trapezoidal, two trapezoidal footing are the acute angle, trapezoidal vertical both sides are the upstream face and the surface of backing a river respectively, desilting structure body upper portion be planar plate body around for, the front and back plane of plate body parallels, seted up a plurality of sand holes that rush to overflow on the plate body, overflow and rush to sand the hole for circular or rectangle or trapezoidal or toper or triangle-shaped.

Furthermore, the overflowing sand washing holes are arranged in one line or up and down multiple lines, and if the overflowing sand washing holes are arranged in multiple lines, the overflowing sand washing holes are arranged in a matrix form or in a shape like a Chinese character pin.

The utility model discloses an actively beneficial technological effect lies in: the structure body can be combined with the basic experimental device to carry out desilting experimental research, provides a new approach method and thought for the experimental research in the field, provides an entry point for vast research students by providing a desilting structure, and continuously perfects and enriches the research of the active desilting method for carrying out desilting sediment desilting by utilizing the water body.

Drawings

Figure 1 is a schematic view of the present dredging structure.

FIG. 2 is a schematic view of the dredging structure combined with the experimental tank.

FIG. 3 is a partial schematic view of an overflow sand wash hole.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

The invention is explained in further detail with reference to the drawings, in which the reference symbols are: 100: dredging the structure body; 1: a trapezoid shape; 2: a water-facing surface; 3: a water-backed surface; 4: a plate body; 5: overflowing sand washing holes; 6: an experimental groove; 7: a rectangular hole; 8: a triangular aperture; 9: a trapezoidal hole; 10: and (4) a tapered hole.

As shown in the attached drawing, the top-sealed dredging structure body for the river and canal dredging experimental research is shown as 100, the longitudinal section of the lower part of the dredging structure body is solid trapezoid, the longitudinal section 1 is shown as trapezoid, two bottom feet of the trapezoid are acute angles, the longitudinal two sides of the trapezoid are respectively a flow-facing surface 2 and a flow-backing surface 3, the upper part of the dredging structure body is a plate body 4 with the front and the rear being flat, the front and the rear planes of the plate body are parallel, a plurality of overflowing sand flushing holes 5 are formed in the plate body, and the overflowing sand flushing holes are circular, rectangular, trapezoidal, conical, semicircular or triangular. Four other different shapes of the overflow sand wash holes are shown in figure 3. The overflowing sand flushing holes are arranged in a row or up and down in a plurality of rows, and if the overflowing sand flushing holes are arranged in a matrix form or a 'pin' shape. The left and right side surfaces of the desilting structure chart are matched with the two side walls of the experiment groove in a matching way.

The design of the dredging structure body obtains thought from the research of prevention and treatment of geological disasters of torrential flood and debris flow, and is provided by inspiring the extremely common engineering structure of the sand blocking dam in the prevention and treatment measures of the torrential flood and debris flow engineering. The debris flow sediment storage dam is divided into a water permeability sediment storage dam and a water impermeability sediment storage dam, wherein the former is optimized by the latter based on the reasons that the hydrostatic pressure of a deposit in front of the dam is reduced in the engineering practice process so as to improve the stability of the dam body, and the application of the sediment storage dam in the field of prevention and control of debris flow of mountain torrents comes from a hydraulic dam built for flood regulation, water storage, power generation and other requirements. The hydraulic dam has the most direct expression of water storage, the main action of the sand blocking dam is sand blocking and water drainage, and the dredging structure body provided by the application has the functions of water guiding and water disturbance, so that the water body turbulence and sand carrying capacity are improved. Compared with the dredging structure body provided by the patent, the sand blocking dam and the hydraulic dam are used for blocking objects (blocking sand by the sand blocking dam and blocking water by the hydraulic dam) by using the reservoir capacity generated by the size of the large-scale structure body, the structure is arranged in a river channel, the structure body is completely immersed in the water environment, the turbulence of the water body is improved by using the disturbance of the structure body, and the final macroscopic expression is that the sand carrying capacity of water flow is improved.

The experimental model body of the top-sealed desilting structure is a structural body with a trapezoidal lower section and a rectangular upper section, and the experimental model of the whole structural body can be processed from materials such as steel plates, plastic plates and wood plates. Based on the current experimental study that the section of the groove section is generally a rectangular or trapezoidal section, the cross section of the structural body reflected by the patent is a trapezoidal surface. The lower part of the structure body is a solid structure, and the function of the structure body is mainly two: 1) the gravity of the structure body is increased, and the stability of the structure body in a water environment is enhanced; 2) the sand-carrying water flow can increase the scouring erosion to the bottom of the riverbed and the channel under the influence of the structure body, and the lower solid structure can effectively prevent the water body from generating a transitional dredging result to the river channel; 3) the lower solid structure will affect a certain range of the upstream area of the canal and allow a certain amount of silt to deposit in the range, and the deposited silt can further effectively protect the bottom of the canal from erosion. The upper part of the structure body is a rectangular section, and is additionally provided with an overflowing sand washing hole which has the following functions: 1) based on the structure existing in an underwater environment, the flow velocity of a water body flowing through the overflow sand flushing holes is enhanced by utilizing the water pressure in the vertical direction, the water body disturbance is enhanced, and the sand carrying capacity of the water body is improved; 2) the addition of the structure body can obviously improve the water level at the structure and in the upstream direction, reduce the area of the overflowing section of a river channel, and the overflowing sand flushing hole can enhance the overflowing capacity of the section of the structure body and reduce the adverse factors as much as possible.

The lower part of the structure is a trapezoidal section, namely the trapezoidal base angle is an acute angle, and the reason is qualitatively described as follows: 1) slope gradient of the structure body incident flow surface "1: i "(i > 0); the incident flow surface of the structure is inclined, so that the backflow disturbance of the water body near the upstream direction of the structure is more effectively reduced than a vertical state, and the original kinetic energy of the water body is favorably kept; the inclined flow surface of the structure body is favorable for bearing more hydrostatic pressure from the right above the structure body, and is more favorable for the anti-slip and anti-overturning capability of the structure body. 2) Gradient of a back flow surface of a structural body is' 1: j (j is more than 0), the back flow surface of the structure is in an inclined state, so that the energy dissipation of the water body which generates a waterfall effect when the water body passes over the structure is more effectively reduced than a vertical state, and the kinetic energy of the water body after passing over the structure is favorably kept; the structure body back flow surface is inclined state and more favorable for the anti-overturning capability of the structure body than the vertical state.

The sand carrying capacity of the water flow after the water flow passes through the overflowing sand washing hole is related to the size and the shape of the overflowing sand washing hole, the water head difference at the overflowing sand washing hole and other factors. However, it is considered that the head difference at the overflow sand-washing hole is related to the cross-sectional area of the channel and the upstream inflow, and generally, the upstream inflow of a specific channel is more stable in a short period and has a more stable or gradual change in a long period. The influence of the head difference factor is not considered here. In order to better compare the influence capacities of different overflowing sand washing holes, the equal or similar overflowing section area or overflowing wet circumference is temporarily determined as the hole body quantification, and the hole body form is variable. Under the premise of not researching a large amount of experiments to obtain an optimal section form, the common drain hole forms of the water-permeable sand blocking dam in the debris flow sand blocking dam protection project are recommended temporarily, and in addition, the arrangement mode of the overflowing sand flushing holes above the structure body can be arranged in a matrix form or a delta shape. And the two marginal areas of the structure body close to the river channel are not provided with overflowing sand flushing holes or are provided with overflowing sand flushing holes as few as possible, so that the hydrodynamic strength of the side slopes of the structure body close to the river channel at two sides can be effectively reduced, and the side slopes of the river channel are protected from being influenced by the erosion of water; meanwhile, the lower hydrodynamic force environment can lead part of silt to be deposited to a certain degree at the connecting part of the structure body and the canal, and the deposited silt can further protect the side slopes at the two sides of the canal.

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims (2)

1. Top seal formula desilting structure body for river channel desilting experimental study, its characterized in that: the longitudinal section of the lower part of the dredging structure body is solid trapezoid, two trapezoidal bottom feet are acute angles, the two longitudinal sides of the trapezoid are a flow-facing surface and a flow-backing surface respectively, the upper part of the dredging structure body is a plate body which is plane in the front and at the back, the front plane and the back plane of the plate body are parallel, a plurality of overflowing sand flushing holes are formed in the plate body, and the overflowing sand flushing holes are circular, rectangular, trapezoidal, conical or triangular.

2. The top-sealed dredging structure body for river and channel dredging experimental research according to claim 1, characterized in that: the overflowing sand flushing holes are arranged in a row or up and down in a plurality of rows, and if the overflowing sand flushing holes are arranged in a matrix form or a 'pin' shape.

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