A trapezoidal open channel steady flow expansion structure and construction method

Abstract

This invention relates to the field of water conservancy engineering technology, specifically disclosing a trapezoidal open channel expansion structure and construction method that allows for uninterrupted irrigation water supply. The structure includes a main frame, inclined frames, and water-retaining plates. Multiple main frames are arranged at intervals along the trapezoidal open channel. Each main frame includes columns and connecting beams. Two columns are fixed at the intersection of the bottom slab and the slope toe of the trapezoidal open channel sidewall. The connecting beams fix the tops of the two columns. Multiple inclined frames are arranged on the widened side of the trapezoidal open channel, corresponding to the positions of the main frames. Each inclined frame includes inclined columns and tie rods. The inclined columns are fixed to the bottom of the columns, and their inclination angle matches the slope of the trapezoidal open channel sidewall. The tie rods fix the inclined columns to the tops of the columns. The water-retaining plates are sealed between adjacent columns or adjacent inclined columns on the widened side of the trapezoidal open channel to form a water-retaining structure. This invention ensures the expansion and renovation of trapezoidal open channels without interrupting irrigation water supply.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a trapezoidal open channel non-flow expansion structure and construction method. Background Technology

[0002] With the increase in irrigated area and changes in planting structure within the irrigation district, agricultural water demand has increased significantly. The existing canals' water conveyance capacity can no longer meet the agricultural development trend of the irrigation district, necessitating the expansion and renovation of existing canals or the construction of new canals. However, constructing new canals would greatly increase investment in civil engineering and land acquisition for resettlement.

[0003] Most existing canals have trapezoidal open channel cross-sections. For expanding these canals, three common methods are deepening the bottom slab, using composite cross-sections, and widening the canal. Deepening the bottom slab of a trapezoidal open channel increases the cross-sectional area, but this is limited by the elevation of existing tunnels, aqueducts, and other canal structures. Therefore, the increased flow rate from deepening the bottom slab is limited, and it's difficult to construct the bottom slab without interrupting flow. Composite cross-sections involve adding a cross-sectional area above the original trapezoidal open channel, but this requires raising the operating water level, and the stability of the slopes becomes more critical. Currently, widening the canal is the most common method. In the event of a flow interruption, the trapezoidal open channel is widened directly. However, this often results in delayed construction periods, making it impossible to guarantee water delivery during the irrigation season. Since crops have strict irrigation cycles, especially during critical growth periods, a flow interruption in the canal can lead to large-scale yield reductions or even crop failure, causing irreversible losses. Summary of the Invention

[0004] The purpose of this invention is to address the problem of widening and expanding a trapezoidal open channel without long-term interruption of flow. This invention provides a structure and construction method for expanding a trapezoidal open channel without interrupting flow, allowing for simultaneous water delivery and construction, thus ensuring uninterrupted irrigation water supply.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a non-flowing expansion structure for a trapezoidal open channel, comprising a main frame, inclined frames, and a water-retaining plate; multiple main frames are arranged at intervals along the direction of the trapezoidal open channel, each main frame including columns and connecting beams, each column being two in number and fixed at the intersection of the bottom plate of the trapezoidal open channel and the slope toe of the side wall of the trapezoidal open channel, and the connecting beams being fixedly connected between the tops of the two columns; multiple inclined frames are arranged on the widening side of the trapezoidal open channel according to the positions of each main frame, each inclined frame including inclined columns and tie rods, the inclined columns being fixed at the bottom of the columns, and the inclination angle of the inclined columns being consistent with the slope of the side wall of the trapezoidal open channel, and the tie rods being fixedly connected between the tops of the inclined columns and the columns; the water-retaining plate is sealed and installed between adjacent columns or adjacent inclined columns on the widening side of the trapezoidal open channel to form a water-retaining structure.

[0007] As a further aspect of the present invention, a traction structure is also included, the traction structure comprising tie stakes and pull ropes, wherein multiple tie stakes are arranged on the non-widened side of the trapezoidal open channel according to the positions of each main frame, and the pull ropes are fixedly connected to the top of each tie stake and each main frame.

[0008] As a further embodiment of the present invention, both the uprights and the inclined columns are I-shaped cross-section structures, and the adjacent uprights and adjacent inclined columns are arranged with their slots facing each other along the direction of the trapezoidal open channel. The two ends of the baffle plate are respectively embedded between the slots of the adjacent uprights or adjacent inclined columns.

[0009] As a further embodiment of the present invention, a rubber pad is provided in the groove of the column and the inclined column on the side that contacts the back surface of the baffle plate. Under the water pressure on the front surface of the baffle plate, the baffle plate can be tightly fitted with the rubber pad to form a seal.

[0010] As a further embodiment of the present invention, a flexible water bladder is provided at the bottom of the baffle plate, and the flexible water bladder can be squeezed with the bottom plate of the trapezoidal open channel to form a water stop.

[0011] As a further embodiment of the present invention, the water-blocking plate is composed of multiple layers of water-blocking plates sequentially assembled along the depth direction of the trapezoidal open channel.

[0012] As a further embodiment of the present invention, each layer of water baffle is provided with a protrusion on the lower side and a groove on the upper side. When splicing, the upper water baffle can embed the protrusion into the groove of the lower water baffle so that the upper water baffle and the lower water baffle can fit together to form a whole.

[0013] As a further embodiment of the present invention, the bottom end of the column forms a fixed section with the bottom plate of the trapezoidal open channel, and the length of the fixed section is not less than the anchorage length required for the stress calculation of the main frame.

[0014] As a further embodiment of the present invention, the inclined frame is fixedly installed on one or both sides of the main frame to achieve single-sided excavation or simultaneous excavation on both sides.

[0015] Secondly, this invention provides a method for constructing a trapezoidal open channel with continuous flow expansion, utilizing the aforementioned trapezoidal open channel with continuous flow expansion structure, including the following steps:

[0016] S1. During the annual maintenance period or dry season of the trapezoidal open channel, install the main frame on the bottom plate of the trapezoidal open channel;

[0017] S2. Tie stakes are installed on the non-widening side of the trapezoidal open channel, and ropes are used to connect the tie stakes to the top of the main frame.

[0018] S3. Install water baffles between adjacent columns on the main frame near the widened side. After completion, the trapezoidal open channel bottom plate, the trapezoidal open channel sidewall on the non-widened side, and the water baffles can form a water conveyance section.

[0019] S4. Excavate the trapezoidal open channel sidewalls and slopes outside the water-retaining plate until the required bottom width for expansion is reached;

[0020] S5. After the widening is completed, install the inclined frame and install the water baffle between the adjacent inclined columns of the inclined frame. After completion, the trapezoidal open channel bottom plate, the trapezoidal open channel sidewall on the non-widened side and the water baffle can form a new water conveyance section.

[0021] S6. Water is continuously conveyed in the same cross-section as the original trapezoidal open channel. At the same time, the bottom slab and side wall concrete lining of the trapezoidal open channel after the construction and excavation are completed.

[0022] S7. After the expansion of the trapezoidal open channel is completed, the water retaining plate, inclined frame, main frame and tie rope are removed in sequence.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] This invention involves setting a main frame on the bottom slab of a trapezoidal open channel and installing a water-retaining plate between adjacent columns of the main frame near the widened side. At this point, the trapezoidal open channel bottom slab, the non-widened sidewalls, and the vertical water-retaining plate form a water-carrying cross-section. Then, excavation is carried out on the widened side. After excavation to the required dimensions, an inclined frame is installed on the main frame, and the water-retaining plate is moved between adjacent inclined columns of the inclined frame. At this point, the trapezoidal open channel bottom slab, the non-widened sidewalls, and the inclined water-retaining plate form a new water-carrying cross-section. Subsequently, concrete lining is constructed on the bottom slab and sidewalls of the excavated area. After the expansion construction is completed, the water-retaining plate, inclined frame, and main frame are removed sequentially. This invention allows for simultaneous water conveyance and expansion construction, ensuring uninterrupted irrigation water supply while enabling the expansion and renovation of the trapezoidal open channel. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0026] Figure 1 This is a schematic diagram of the non-full-section flow passage of the trapezoidal open channel non-flow expansion structure in this invention;

[0027] Figure 2 This is a schematic diagram of the full-section flow passage of the trapezoidal open channel non-flow expansion structure in this invention;

[0028] Figure 3 This is a schematic diagram of the water seal structure between the two ends of the water baffle and the column or inclined column in this invention;

[0029] Figure 4 This is a schematic diagram of the interlocking structure of the upper and lower water baffles in this invention;

[0030] Figure 5 This is a schematic diagram of the bottom water baffle and flexible water bladder in this invention.

[0031] The attached diagram shows the markings and corresponding component names:

[0032] 1-Open channel bottom slab; 2-Non-widened side wall; 3-Wideened side wall; 4-Main frame; 41-Column; 42-Connecting beam; 43-Rubber pad; 5-Fitted section; 6-Water retaining plate; 61-Groove; 62-Protrusion; 63-Flexible water bag; 7-Pull rope; 71-Tie stake; 8-Inclined frame; 81-Inclined column; 82-Tie rod; 9-Open channel expansion section. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0037] In the description of the embodiments of this application, the technical terms "center", "length", "height", "thickness", "depth", "vertical", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Please refer to Figures 1 to 5 This application provides a trapezoidal open channel non-flow expansion structure, including a main frame 4, inclined frames 8, and a water-blocking plate 6. Multiple main frames 4 are arranged at intervals along the direction of the trapezoidal open channel. Each main frame 4 includes columns 41 and connecting beams 42. Two columns 41 are fixed at the intersection of the bottom plate 1 of the trapezoidal open channel and the slope toe of the side wall of the trapezoidal open channel. The connecting beams 42 are fixedly connected between the tops of the two columns 41. Multiple inclined frames 8 are arranged on the widened side of the trapezoidal open channel according to the positions of each main frame 4. Each inclined frame 8 includes inclined columns 81 and tie rods 82. The inclined columns 81 are fixed to the bottom of the columns 41, and the inclination angle of the inclined columns 81 is consistent with the slope of the side wall of the trapezoidal open channel. The tie rods 82 are fixedly connected between the tops of the inclined columns 81 and the columns 41. The water-blocking plate 6 is sealed and installed between adjacent columns 41 or adjacent inclined columns 81 on the widened side of the trapezoidal open channel to form a water-blocking structure.

[0040] The two columns 41 and the connecting beam 42 form a portal-shaped main frame 4. Each main frame 4 is arranged at an appropriate interval along the centerline of the trapezoidal open channel. The spacing and cross-sectional dimensions of the main frames 4 are selected based on the channel's flow depth and the magnitude of the forces acting upon it. The two columns 41 in the main frame 4 are respectively fixed to the bottom slab 1 of the trapezoidal open channel and the sidewall of the trapezoidal open channel (e.g.,...). Figure 1 The intersection of the slope toe of the non-widened side wall 2 and the widened side wall 3. The aforementioned inclined column 81 and tie rod 82 form a triangular inclined frame 8 after being connected to the main frame 4. This inclined frame 8 is connected to the main frame 4 after the widening side of the trapezoidal open channel is excavated.

[0041] By sealing the aforementioned water-retaining plate 6 between adjacent uprights 41 or adjacent inclined columns 81 on the widened side of the trapezoidal open channel, two different water conveyance cross-sections can be formed. It should be noted that the length of the water-retaining plate 6 matches the spacing between adjacent main frames 4, and the height and thickness of the water-retaining plate 6 are determined to meet the requirements of rapid installation and water pressure resistance.

[0042] Specifically, when the baffle plate 6 is installed on the column 41 on one side of the main frame 4, the original trapezoidal open channel bottom plate 1, the non-widened side wall 2, and the vertical baffle plate 6 form a water-carrying cross-section. At this time, the maximum water flow is slightly less than the original trapezoidal open channel design flow, and widening and expansion construction can be carried out simultaneously on one side of the trapezoidal open channel. When the baffle plate 6 is installed on the inclined column 81 on one side of the inclined frame 8, the original trapezoidal open channel bottom plate 1, the non-widened side wall 2, and the inclined baffle plate 6 form a water-carrying cross-section. At this time, the maximum water flow is close to the original trapezoidal open channel design flow, and widening and expansion construction can be carried out simultaneously on one side of the trapezoidal open channel. If inclined frames 8 and inclined baffle plates 6 are installed on both sides of the main frame 4, the original trapezoidal open channel bottom plate 1 and the inclined baffle plates 6 on both sides form a water-carrying cross-section. At this time, the maximum water flow is close to the original trapezoidal open channel design flow, and widening and expansion construction can be carried out simultaneously on both sides of the trapezoidal open channel.

[0043] This application involves setting a main frame 4 on the trapezoidal open channel bottom slab 1, and setting a water-blocking plate 6 between adjacent columns 41 near the widened side of the main frame 4. At this time, the trapezoidal open channel bottom slab 1, the non-widened side wall 2, and the vertical water-blocking plate 6 can form a water-passing cross section for water conveyance. Then, the widened side is excavated. After excavation to the required size, an inclined frame 8 is installed on the main frame 4, and the water-blocking plate 6 is moved between adjacent inclined columns 81 of the inclined frame 8. At this time, the trapezoidal open channel bottom slab 1, the non-widened side wall 2, and the inclined water-blocking plate 6 can form a new water-passing cross section for water conveyance. Subsequently, the bottom slab and side wall of the excavated area are lined with concrete. After the expansion construction is completed, the water-blocking plate 6, the inclined frame 8, the main frame 4, etc. are removed in sequence. This invention can carry out expansion construction while conveying water, thereby ensuring that the expansion and renovation construction of the trapezoidal open channel can be carried out without interruption of irrigation water supply.

[0044] According to some embodiments of this application, the bottom end of the column 41 forms a fixed section 5 with the trapezoidal open channel bottom plate 1, and the length of the fixed section 5 is not less than the anchorage length required by the stress calculation of the main frame 4. The bottom end of the column 41 is embedded in the trapezoidal open channel bottom plate 1 for fixation, and the length of its fixed section 5 should not be less than the anchorage length required by the stress calculation of the main frame 4.

[0045] According to some embodiments of this application, a traction structure is also included, which includes tie stakes 71 and pull ropes 7. Multiple tie stakes 71 are arranged on the non-widened side of the trapezoidal open channel according to the positions of each main frame 4. The pull ropes 7 are fixedly connected to the top of each tie stake 71 and each main frame 4.

[0046] The aforementioned tie-down posts 71 can be installed on the walkway on the top of the non-widened side of the trapezoidal open channel. The arrangement of each tie-down post 71 along the direction of the trapezoidal open channel corresponds to the position of each main frame 4. Each tie-down post 71 is connected to the top of the main frame 4 by a rope 7, which can provide tension to the main frame 4 and play an auxiliary fixing role during water conveyance. It should be noted that when there are inclined frames 8 on both sides of the main frame 4, the above-mentioned traction structure can be omitted.

[0047] The structural stress decomposition of this application is as follows: the water pressure within the frame spacing length of each main frame 4 and inclined frame 8 directly acts on the inner side of the water baffle 6, the two ends of the water baffle 6 transmit the force to the main frame 4 or the inclined frame 8, the embedded section 5 at the bottom of the column 41 makes the column 41 a cantilever column, and the rope 7 provides tension to the main frame 4 to ensure the stress balance of the entire structure.

[0048] According to some embodiments of this application, both the upright column 41 and the inclined column 81 have an I-shaped cross-section structure, and adjacent upright columns 41 and adjacent inclined columns 81 are arranged with their slots facing each other along the trapezoidal open channel. The two ends of the baffle plate 6 are respectively embedded between the slots of the adjacent upright column 41 or the adjacent inclined column 81. The aforementioned upright column 41 and inclined column 81 adopt an I-shaped cross-section, so that both upright column 41 and inclined column 81 have a slot on one side, which can be used to install the end of the baffle plate 6.

[0049] According to some embodiments of this application, a rubber pad 43 is provided in the slots of the upright column 41 and the inclined column 81 on the side that contacts the back surface of the baffle plate 6. Under the water pressure on the water-facing side, the baffle plate 6 can be tightly fitted with the rubber pad 43 to form a seal. Since both ends of the baffle plate 6 can be embedded in the slots of the I-shaped upright column 41 or the inclined column 81, and the rubber pad 43 is provided on the side of the baffle plate 6 without water flow and is tightly attached to the inner wall of the slot, the water pressure provided on the side with water flow presses the baffle plate 6 tightly onto the rubber pad 43, preventing water leakage at the connection.

[0050] According to some embodiments of this application, a flexible water bladder 63 is provided at the bottom of the baffle plate 6. The flexible water bladder 63 can be squeezed against the trapezoidal open channel bottom plate 1 to form a water stop. By providing a flexible water bladder 63 between the bottom of the baffle plate 6 and the trapezoidal open channel bottom plate 1 for water stop, the flexible water bladder 63 has a certain deformation capacity, which can better adapt to the unevenness of the trapezoidal open channel bottom plate 1, thereby ensuring that the bottom of the baffle plate 6 does not leak.

[0051] According to some embodiments of this application, the water baffle 6 is composed of multiple layers of water baffles 6 sequentially assembled along the depth direction of the trapezoidal open channel. Each layer of water baffle 6 has a protrusion 62 on its lower side and a groove 61 on its upper side. When splicing, the upper layer of water baffle 6 can embed the protrusion 62 into the groove 61 of the lower layer of water baffle 6 so that the upper layer of water baffle 6 and the lower layer of water baffle 6 can fit together to form a whole.

[0052] By dividing the water-blocking plate 6 into a multi-layered, modular structure, installation and relocation of the water-blocking plate 6 are facilitated. Furthermore, by providing protrusions 62 on the lower side and grooves 61 on the upper side of each layer of the water-blocking plate 6, the upper layer of the water-blocking plate 6 can embed the protrusions 62 into the grooves 61 of the lower layer during assembly, thus preventing leakage. It should be noted that a corresponding sealing strip structure can also be provided between the mating surfaces of the upper and lower layers of the water-blocking plate 6 to prevent leakage at the joint.

[0053] After the excavation of the widened side of the trapezoidal open channel and the welding of the inclined frame 8 are completed, the water-retaining plate 6 is transferred and installed between the adjacent inclined columns 81 to restore the original water conveyance cross-section of the trapezoidal open channel. Provided that the material strength requirements are met, the main frame 4 and the inclined frame 8 can be made of steel or lightweight aluminum, and the water-retaining plate 6 can be made of lightweight aluminum for easy installation.

[0054] According to some embodiments of this application, the inclined frame 8 is fixedly installed on one or both sides of the main frame 4 to achieve single-sided excavation or simultaneous excavation on both sides.

[0055] This application provides a method for constructing a trapezoidal open channel with continuous flow expansion, utilizing the aforementioned trapezoidal open channel structure with continuous flow expansion, including the following steps:

[0056] S1. During the annual maintenance period or dry season of the trapezoidal open channel, drill holes at appropriate intervals along the center line of the trapezoidal open channel at the intersection of the bottom plate 1 of the trapezoidal open channel and the slope toe of the side wall of the trapezoidal open channel. The drilling depth should meet the length requirements of the embedded section 5 of the column 41. Then install the column 41 of the main frame 4, and fill the embedded section 5 of the column 41 with mortar or other anchoring materials to fix the column 41. Then weld the connecting beam 42 at the top of the column 41 to form the entire main frame 4.

[0057] S2. Anchor the tie piles 71 on the walkway on the top of the non-widened side of the trapezoidal open channel. The spacing of each tie pile 71 is consistent with the spacing of each main frame 4. Connect the tie piles 71 and the top of the columns 41 of the main frame 4 with the two ends of the pull rope 7.

[0058] S3. Install vertical water baffles 6 between adjacent columns 41 on the widened side of the main frame 4. After installation, the original trapezoidal open channel bottom plate 1, the non-widened side wall 2 and the vertical water baffles 6 can form a water conveyance section. At this time, the maximum water conveyance flow is slightly less than the original trapezoidal open channel design flow. From then on, water can be conveyed while construction is underway.

[0059] S4. Excavate the trapezoidal open channel outside the water-retaining plate 6, widen the side wall 3 and the slope until the bottom width required for the expansion of the trapezoidal open channel is reached.

[0060] S5. After the trapezoidal open channel is widened, the inclined frame 8 is installed on each main frame 4, and the vertical water baffle 6 is transferred and installed between the adjacent inclined columns 81 of the inclined frame 8. After completion, the original trapezoidal open channel bottom plate 1, the non-widened side wall 2 and the inclined water baffle 6 can form a new water conveyance section. At this time, the maximum water conveyance flow rate is basically close to the original trapezoidal open channel design flow rate.

[0061] S6. Water is continuously conveyed in the same cross-section as the original trapezoidal open channel. At the same time, the bottom slab 1 of the trapezoidal open channel after construction and widening is lined with concrete for the side walls.

[0062] After the expansion of the trapezoidal open channel is completed, the water-retaining plate 6, the inclined frame 8, the main frame 4, the rope 7 and other structures will be removed in sequence.

[0063] Due to factors such as the length of the trapezoidal open channel and the construction procedures, the construction period required to complete the expansion and renovation of the entire trapezoidal open channel is usually longer than the channel's annual maintenance period or the dry season. If the channel enters the irrigation and water supply period immediately after the channel expansion is completed, the overflow in the expanded section without a lining structure will cause water seepage in the channel body, affecting the stability of the channel slope and easily damaging the existing channel lining. Therefore, this application utilizes the channel's annual maintenance period or dry season to install the main frame 4 and water-retaining plate 6, thereby forming a water-transporting cross-section using the original trapezoidal open channel bottom slab 1, non-widened side walls 2, and vertical water-retaining plate 6. This allows for simultaneous excavation for widening the channel's side. After excavation, an inclined frame 8 is added to the main frame 4, and the water-retaining plate 6 is installed. This creates a new water-transporting cross-section using the original trapezoidal open channel bottom slab 1, non-widened side walls 2, and inclined water-retaining plate 6. Simultaneously, the concrete lining construction of the open channel expansion section 9 can be carried out, while the water flow rate is restored to the original trapezoidal open channel's design flow rate. This scheme significantly shortens the channel flow interruption time caused by expansion construction, does not affect crop irrigation, and ensures uninterrupted irrigation water supply while achieving the expansion and renovation of the trapezoidal open channel.

[0064] It should be noted that the expansion of a trapezoidal open channel can be divided into single-sided widening or double-sided widening. Single-sided widening involves widening only one side of the channel, while double-sided widening involves widening both sides of the channel. For double-sided widening, one approach can be to widen one side of the channel first and then widen the other side, or diagonal frames 8 can be installed on both sides of the main frame 4 to achieve simultaneous widening on both sides of the channel.

[0065] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing a trapezoidal open channel with continuous flow expansion, characterized in that, Construction utilizes a trapezoidal open channel with a continuous flow expansion structure. This structure includes a main frame, inclined frames, water-retaining plates, and a traction structure. Multiple main frames are arranged at intervals along the trapezoidal open channel. Each main frame includes columns and connecting beams. Two columns are fixed at the intersection of the bottom slab and the slope toe of the trapezoidal open channel sidewall. The connecting beams are fixedly connected between the tops of the two columns. Multiple inclined frames are arranged on the widened side of the trapezoidal open channel, corresponding to the positions of the main frames. Each inclined frame includes inclined columns and tie rods. The inclined columns are fixed to the bottom of the columns, and their inclination angle matches the slope of the trapezoidal open channel sidewall. The tie rods are fixedly connected between the inclined columns and the tops of the columns. Water-retaining plates are sealed and installed between adjacent columns or adjacent inclined columns on the widened side of the trapezoidal open channel to form a water-retaining structure. The traction structure includes tie piles and ropes. Multiple tie piles are arranged on the non-widened side of the trapezoidal open channel, corresponding to the positions of the main frames. The ropes are fixedly connected between each tie pile and the top of each main frame. The method includes the following steps: S1. During the annual maintenance period or dry season of the trapezoidal open channel, install the main frame on the bottom plate of the trapezoidal open channel; S2. Tie stakes are installed on the non-widening side of the trapezoidal open channel, and ropes are used to connect the tie stakes to the top of the main frame. S3. Install water baffles between adjacent columns on the main frame near the widened side. After completion, the trapezoidal open channel bottom plate, the trapezoidal open channel side wall on the non-widened side, and the water baffles can form a water conveyance section. S4. Excavate the trapezoidal open channel sidewalls and slopes outside the water-retaining plate until the required bottom width for expansion is reached; S5. After the widening is completed, install the inclined frame and install the water baffle between the adjacent inclined columns of the inclined frame. After completion, the trapezoidal open channel bottom plate, the trapezoidal open channel sidewall on the non-widened side and the water baffle can form a new water conveyance section. S6. Water is continuously conveyed in the same cross-section as the original trapezoidal open channel. At the same time, the bottom slab and side wall concrete lining of the trapezoidal open channel after the construction and excavation are completed. After the expansion of the trapezoidal open channel is completed, the water-retaining plate, inclined frame, main frame and tie rope shall be removed in sequence.

2. The method for constructing a trapezoidal open channel with continuous flow expansion according to claim 1, characterized in that, Both the uprights and the inclined columns have an I-shaped cross-section structure, and the adjacent uprights and adjacent inclined columns are arranged with their slots facing each other along the direction of the trapezoidal open channel. The two ends of the baffle plate are respectively embedded between the slots of the adjacent uprights or adjacent inclined columns.

3. The method for expanding the capacity of a trapezoidal open channel without interruption of flow according to claim 2, characterized in that, A rubber pad is provided in the groove of the column and the inclined column on the side that contacts the back surface of the baffle. Under the water pressure on the front side of the baffle, the baffle can fit tightly with the rubber pad to form a seal and stop water.

4. The method for expanding the capacity of a trapezoidal open channel without interruption of flow according to claim 1, characterized in that, The bottom of the baffle plate is provided with a flexible water bladder, which can be squeezed with the trapezoidal open channel bottom plate to form a water stop.

5. The method for expanding the capacity of a trapezoidal open channel without interruption of flow according to claim 1, characterized in that, The water-retaining plate is composed of multiple layers of water-retaining plates assembled sequentially along the depth direction of the trapezoidal open channel.

6. The method for constructing a trapezoidal open channel with continuous flow expansion according to claim 5, characterized in that, Each layer of water baffle has a protrusion on the lower side and a groove on the upper side. When splicing, the upper water baffle can insert the protrusion into the groove of the lower water baffle so that the upper water baffle and the lower water baffle can fit together to form a whole.

7. The method for expanding the capacity of a trapezoidal open channel without interruption of flow according to claim 1, characterized in that, The bottom end of the column forms a fixed section with the bottom plate of the trapezoidal open channel, and the length of the fixed section is not less than the anchorage length required for the stress calculation of the main frame.

8. The method for constructing a trapezoidal open channel with continuous flow expansion according to claim 1, characterized in that, The inclined frame is fixedly installed on one or both sides of the main frame to achieve single-sided excavation or simultaneous excavation on both sides.

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