Flushing and abrasion resisting structure for overflow surface of flood discharge gate
By setting anti-abrasion concrete layers and epoxy mortar layers on the bottom slab of the flood discharge gate and the flow surface of the gate pier, the problem of erosion and abrasion of the flood discharge gate in high-speed water flow is solved, the anti-abrasion and abrasion capability of the flood discharge gate is improved, the operational safety is ensured, and the maintenance cost is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-01
AI Technical Summary
During flood discharge, floodgates are subjected to the erosion of bedloads and suspended sediments in the high-speed water flow, resulting in erosion of the concrete surface and exposure of the reinforcing steel, which threatens operational safety. In particular, floodgate projects with large flow rates and high sediment content require frequent repairs.
An anti-erosion concrete layer and an epoxy mortar layer are installed on the bottom slab of the gate chamber and the flow surface of the gate pier. The anti-erosion concrete layer is installed on the upper surface of the bottom slab of the gate chamber, and the epoxy mortar layer is installed on the flow surface of the side of the gate pier and covers the anti-erosion concrete layer. High-strength concrete and epoxy mortar are selected as materials to enhance the anti-erosion performance.
It effectively resists the scouring of high-speed water flow containing silt, protects the stability and safety of the floodgate, and reduces the investment cost of anti-scouring measures.
Smart Images
Figure CN224186700U_ABST
Abstract
Description
A scouring and abrasion resistant structure for the flow surface of a flood discharge gate Technical Field
[0001] This application relates to the field of water conservancy and hydropower engineering technology, specifically to an anti-erosion structure for the flow surface of a flood discharge gate. Background Technology
[0002] In water conservancy and hydropower projects, the spillway gate is a key water discharge structure, and its operational safety is of paramount importance. During flood discharge, the spillway gate generates a high-speed water flow carrying suspended and bedload sediment, which exerts a severe erosive effect on the bottom slab and pier surfaces of the spillway gate. Bedload sediment primarily affects the bottom of the spillway gate and piers. This erosive effect can lead to concrete surface erosion and exposed reinforcing steel. If not addressed promptly, it will threaten the operational safety of the spillway gate. Therefore, every year after the flood season, a large number of spillway gates require repair, a phenomenon particularly prevalent in sluice gate projects with high flow rates and high sediment content. Summary of the Invention
[0003] This application provides an anti-erosion structure for the flow surface of a flood discharge gate, which can improve the anti-erosion performance of the flow surface of the flood discharge gate and effectively resist the scouring of high-speed water flow containing silt.
[0004] The anti-erosion structure for the flow surface of the flood discharge gate provided in this application is used to prevent bedload and suspended sediment in the water flow from causing erosion damage to the flood discharge gate. It includes an anti-erosion concrete layer and an epoxy mortar layer. The flood discharge gate includes a gate chamber bottom plate and a gate pier. The anti-erosion concrete layer is disposed on the upper surface of the gate chamber bottom plate and at a flow surface position near the bottom side of the gate pier at a predetermined height. The epoxy mortar layer is disposed on the flow surface position on the side of the gate pier, and the epoxy mortar layer extends towards the bottom side of the gate pier and covers the anti-erosion concrete layer of a predetermined width.
[0005] In addition, the anti-erosion structure of the floodgate flow surface provided in this application may also have the following additional technical features:
[0006] In one alternative embodiment, the grade of the erosion-resistant concrete layer is C40 secondary aggregate, the height of the erosion-resistant concrete layer laid near the bottom of the gate pier is 1.5m, and the thickness of the erosion-resistant concrete layer laid on the bottom plate of the gate chamber and the gate pier is not less than 0.5m.
[0007] The epoxy mortar layer is laid from below the normal flood discharge water level of the gate pier to 1.2m above the bottom plate of the gate pier, with a thickness of not less than 2mm, and the epoxy mortar layer covers the anti-erosion concrete layer by a width of 0.3m.
[0008] In one alternative embodiment, the concrete material of the impact-resistant concrete layer includes cement, fly ash, aggregate, and admixtures. The coarse aggregate in the aggregate includes artificial crushed stone and / or natural pebbles, and the surface powder coating of the coarse aggregate is no more than 0.5%. The fine aggregate in the aggregate includes artificial sand.
[0009] In one optional embodiment, the saturated compressive strength of the artificial crushed rock parent rock is greater than 60 MPa, and the crushing index is less than 10%; the stone powder content in the artificial sand is less than 10%; and the admixture is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate greater than 25%.
[0010] In one alternative embodiment, the epoxy mortar layer has a bonding strength of not less than 3 MPa, a compressive strength of not less than 90 MPa, a tensile strength of not less than 25 MPa, and a compressive modulus of elasticity of approximately 2000 MPa.
[0011] The beneficial effects of this application are as follows:
[0012] The anti-erosion structure of the spillway gate's flow surface in this application is based on the characteristics of bedload and suspended mass distribution in the high-speed water flow during flood discharge. An anti-erosion concrete layer is installed on the flow surface within a predetermined height range at the bottom of the gate chamber floor and the gate pier sidewalls, while the non-flow surface retains normal concrete. An epoxy mortar layer is installed on the overflow surface of the gate piers. The spillway gate has strong anti-erosion capabilities, effectively resisting the scouring of high-speed water flow carrying silt and protecting the stability and safety of the gate chamber. Furthermore, the anti-erosion measures designed according to the characteristics of the water flow, bedload, and suspended mass are relatively more cost-effective.
[0013] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description
[0014] Figure 1 is an elevation view of the anti-abrasion structure of the floodgate flow surface provided in this application;
[0015] Figure 2 is a schematic diagram of the cross-sectional structure at point AA in Figure 1.
[0016] Figure labels: 1. Anti-erosion concrete layer; 2. Epoxy mortar layer; 3. Gate chamber bottom plate; 4. Gate pier; 5. Normal flood discharge water level.
[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation
[0018] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0019] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0020] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0021] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0022] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.
[0023] As shown in Figures 1-2, this application embodiment provides a scour-resistant structure for the flow surface of a flood discharge gate. This scour-resistant structure is used to prevent bedload and suspended sediment in the water flow from causing scour damage to the flood discharge gate. Specifically, it includes a scour-resistant concrete layer 1 and an epoxy mortar layer 2. The flood discharge gate includes a gate chamber bottom plate 3 and a gate pier 4. The scour-resistant concrete layer 1 is disposed on the upper surface of the gate chamber bottom plate 3 and at the flow surface position of the gate pier 4 near the bottom side at a predetermined height. The epoxy mortar layer 2 is disposed on the flow surface position on the side of the gate pier 4, and the epoxy mortar layer 2 extends towards the bottom side of the gate pier 4 and covers the scour-resistant concrete layer 1 of a predetermined width.
[0024] In this embodiment, the anti-erosion structure of the spillway's flow surface is designed based on the characteristics of bedload and suspended mass distribution in the high-speed water flow during flood discharge. An anti-erosion concrete layer 1 is installed on the flow surface within a predetermined height range at the bottom of the gate chamber floor slab 3 and the sidewalls of the gate pier 4. The non-flow surface still uses normal concrete. An epoxy mortar layer 2 is installed on the overflow surface of the gate pier 4. The spillway has strong anti-erosion capabilities, effectively resisting the scouring of high-speed water flow containing sediment and protecting the stability and safety of the gate chamber. Furthermore, the anti-erosion measures designed according to the characteristics of the water flow, bedload, and suspended mass are relatively more cost-effective.
[0025] As shown in Figures 1-2, in one specific embodiment, the erosion-resistant concrete layer 1 is C40 grade 2 mix. The height range of the erosion-resistant concrete layer 1 near the bottom of the gate pier 4 is 1.5m, that is, it is laid 1.5m upward from the side wall of the gate pier 4 near the bottom. The thickness of the erosion-resistant concrete layer 1 on the gate chamber bottom plate 3 and the gate pier 4 is not less than 0.5m. In addition, the epoxy mortar layer 2 is laid from below the normal flood discharge water level 5 of the gate pier 4 (which can be measured by hydraulic model test, so it is not specifically limited in this article) to 1.2m above the bottom plate of the gate pier 4, with a thickness of not less than 2mm, and the epoxy mortar layer 2 covers the erosion-resistant concrete layer 1 by about 0.3m.
[0026] In one specific embodiment, the concrete material of the impact-resistant concrete layer 1 includes cement, fly ash, aggregate, and admixtures. The coarse aggregate is preferably hard artificial crushed stone and / or natural pebbles. The saturated compressive strength of the parent rock of the artificial crushed stone should be greater than 60 MPa, and the crushing index should be less than 10%, with a surface dust content (mud content) of ≤0.5%. The fine aggregate is preferably hard, well-graded artificial sand. When using artificial sand, the stone powder content should be less than 10%. Furthermore, the admixture should be a polycarboxylate-based high-performance water-reducing agent with a water-reducing rate greater than 25%. In addition, the epoxy mortar layer 2 has a bond strength of not less than 3 MPa, a compressive strength of not less than 90 MPa, a tensile strength of not less than 25 MPa, and a compressive modulus of elasticity of approximately 2000 MPa, for example, 1900–2100 MPa.
[0027] The anti-erosion structure of the spillway gate's flow surface in this embodiment can be constructed according to the following steps:
[0028] S1. Complete the foundation treatment of the floodgate, and level or backfill the foundation to the bottom elevation of the gate chamber bottom plate 3.
[0029] S2. Fabricate and install the reinforcing bars around the gate chamber bottom slab 3, and pour the gate chamber bottom slab concrete up to a height of 2m below the top surface of the bottom slab. Fabricate and install the reinforcing bars for the surface layer of the gate chamber bottom slab and the bottom of the gate pier 4, and pour the remaining 2m height of the gate chamber bottom slab 3 and the 1m height of the gate pier 4 reinforcing bars. The impact-resistant concrete is poured together with the bottom normal concrete to ensure good structural integrity of the gate chamber bottom slab 3 and the gate pier 4. Fabricate the gate pier reinforcing bars and pour the gate pier concrete from bottom to top until the construction of the gate pier 4 is completed.
[0030] S3. Apply a 2mm thick layer of epoxy mortar to the sidewall surface of gate pier 4. The mortar should be carefully vibrated to ensure that it fully bonds with the concrete. The exposed mortar surface must be smoothed and cured and protected.
[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A scouring and abrasion-resistant structure for the flow surface of a flood discharge gate, used to prevent bedload and suspended sediment in the water flow from causing scouring and damage to the flood discharge gate, characterized in that, The floodgate includes an anti-erosion concrete layer and an epoxy mortar layer. The floodgate includes a gate chamber bottom plate and a gate pier. The anti-erosion concrete layer is disposed on the upper surface of the gate chamber bottom plate and at the flow surface position of the gate pier near the bottom side at a predetermined height. The epoxy mortar layer is disposed on the flow surface position on the side of the gate pier, and the epoxy mortar layer extends towards the bottom side of the gate pier and covers the anti-erosion concrete layer of a predetermined width.
2. The anti-erosion structure for the flow surface of the flood discharge gate according to claim 1, characterized in that, The grade of the erosion-resistant concrete layer is C40 grade 2 mix. The height of the erosion-resistant concrete layer near the bottom of the gate pier is 1.5m, and the thickness of the erosion-resistant concrete layer on the bottom plate of the gate chamber and the gate pier is not less than 0.5m. The epoxy mortar layer is laid from below the normal flood discharge water level of the gate pier to 1.2m above the bottom plate of the gate pier, with a thickness of not less than 2mm, and the width of the epoxy mortar layer covering the erosion-resistant concrete layer is 0.3m.
3. The anti-erosion structure for the flow surface of the flood discharge gate according to claim 1 or 2, characterized in that, The concrete material of the impact-resistant concrete layer includes cement, fly ash, aggregate and admixture. The coarse aggregate includes artificial crushed stone and / or natural pebbles, and the surface powder coating of the coarse aggregate is not greater than 0.5%. The fine aggregate includes artificial sand.
4. The anti-erosion structure for the flow surface of the flood discharge gate according to claim 3, characterized in that, The artificial crushed stone parent rock has a saturated compressive strength greater than 60 MPa and a crushing index less than 10%; the stone powder content in the artificial sand is less than 10%; and the admixture is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate greater than 25%.
5. The anti-erosion structure for the flow surface of the flood discharge gate according to claim 3, characterized in that, The epoxy mortar layer has a bonding strength of not less than 3 MPa, a compressive strength of not less than 90 MPa, a tensile strength of not less than 25 MPa, and a compressive elastic modulus of approximately 2000 MPa.